System Requirements Date: Specificationibb.iveco.com/Body Builder Instructions/Central Europe/DAILY/Rain Light Solar Humidity...Hella KGaA Hueck & Co. 59552 Lippstadt System Requirements

Hella KGaA Hueck & Co. 59552 Lippstadt

System Requirements Specification

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Description: Rain Light Sensor Customer part number:

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Vertraulich. Weitergabe sowie Verwertung und Mitteilung des Inhalts ist nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten. This document is confidential. Its contents are not to be exploited, passed on or disclosed to third parties without our express permission. All rights are reserved.

Rain Light Solar Humidity HUD Sensor

Version Date Author [name/signature]

Review [name/signature]

Approval Hella [name/signature]

Approval customer [name/signature]

Signatures are stored in original at HFK-EE.



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Companies involved in the project: <customer> following named customer. Hella Fahrzeugkomponenten GmbH Dortmunder Straße 5 D-28199 Bremen following named Hella. Alteration Index Version Alteration status Reason of change Chapter Author Date 1.0 Initial version all I. Sfercoci 15 April 2016



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Table of Contents 1 Definitions and general assignments ...................................................................................................... 5

1.1 Assumptions and deviations ............................................................................................................ 5

1.2 List of mutually applicable documents ............................................................................................. 5

2 General project data ............................................................................................................................... 6

2.1 Brief description ............................................................................................................................... 6

2.3 Samples .......................................................................................................................................... 7

2.3.1 Types of samples ...................................................................................................................... 7

3 General product data (system, device, module, component) .................................................................. 8

3.1 General product requirements ......................................................................................................... 8

3.1.1 Brief description of the product ................................................................................................. 8

3.1.1.1 Rain function ...................................................................................................................... 8

3.1.1.2 Light function ..................................................................................................................... 9

3.1.1.3 Climate function ............................................................................................................... 10

3.1.1.4 HUD function ................................................................................................................... 10

3.2 Product environment ..................................................................................................................... 11

3.2.1 Overview of system interfaces to the vehicle (overall system) ................................................. 11

3.2.4 Interface specification ............................................................................................................. 11

3.2.4.2 Connection of the sensor ................................................................................................. 11

3.2.4.4 Communication interface ................................................................................................. 12

3.2.4.4.1 LIN communication ................................................................................................... 12

3.2.4.5 Windshield requirements .................................................................................................. 12

3.2.4.5.1 Transmittance and reflective properties ..................................................................... 12

3.2.4.5.2 Radius of curvature ................................................................................................... 14

3.2.4.5.3 Windscreen thickness ............................................................................................... 14

3.2.4.5.4 Shade band ............................................................................................................... 14

3.2.4.5.5 Positioning of the sensor ........................................................................................... 14

3.2.4.5.7 Inclination angle of the windscreen............................................................................ 18

3.2.4.5.8 New types of windscreens ......................................................................................... 18

3.2.4.5.9 Cutout of the blackprint ............................................................................................. 19

3.2.4.7 Bracket requirements ....................................................................................................... 19

3.2.4.7.5 Requirements concerning the gluing process of the fixing element to the windshield 19

3.3 Climate properties ......................................................................................................................... 19

3.3.1 Temperatures ......................................................................................................................... 19

3.3.2 IP protective rating (protection against foreign bodies, contact and water) .............................. 20

4 Functional description .......................................................................................................................... 21

4.1 Functional properties ..................................................................................................................... 21

4.1.1 Operating modes .................................................................................................................... 21

4.1.1.3 Normal operation ............................................................................................................. 21

4.1.1.6 Sleep mode ...................................................................................................................... 21

4.1.2 Rain function ........................................................................................................................... 21

4.1.2.1 Physical basic principle .................................................................................................... 21

4.1.2.2 Calibration and adjustment of the rain sensor .................................................................. 22

4.1.2.2.1 Rain channel calibration ............................................................................................ 22



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4.1.2.2.2 Rain channel adjustment ........................................................................................... 23

4.1.2.3 Activation of the rain sensor ............................................................................................. 23

4.1.2.4 Threshold values and sensitivity ...................................................................................... 24

4.1.2.4.2 Dependency on the light situation.............................................................................. 25

4.1.2.4.3 Dependency on the vehicle speed............................................................................. 25

4.1.2.5 Wiping process ................................................................................................................ 26

4.1.2.5.1 Parking position signal .............................................................................................. 26

4.1.2.6 Wiper control .................................................................................................................... 26

4.1.2.9 Splash detection .............................................................................................................. 27

4.1.2.11 Dirt detection .................................................................................................................. 27

4.1.2.12 Salt detection ................................................................................................................. 28

4.1.2.13 Dew detection ................................................................................................................ 28

4.1.2.14 Wiper start-up suppression ............................................................................................ 28

4.1.3 Light function .......................................................................................................................... 28

4.1.3.1 Physical basic principle .................................................................................................... 29

4.1.3.1.1 Ambient light sensor .................................................................................................. 29

4.1.3.3 Threshold value and sensitivity ........................................................................................ 30

4.1.3.3.1 Speed dependence ................................................................................................... 30

4.1.3.3.2 Dependence on the sensitivity setting ....................................................................... 30

4.1.3.5 Light basic function .......................................................................................................... 30

4.1.3.7 Tunnel light ...................................................................................................................... 31

4.1.3.8 Underground parking garage exit ..................................................................................... 31

4.1.3.11 Instrument lighting .......................................................................................................... 31

4.1.4 Climate function ...................................................................................................................... 32

4.1.4.1 Solar sensor ..................................................................................................................... 32

4.1.4.1.2 Measuring and detection range of the solar sensor ................................................... 32

4.1.4.2 Humidity function ............................................................................................................. 35

4.1.4.2.1 Technical requirements concerning the humidity sensor ........................................... 35

4.1.5 HUD lighting ........................................................................................................................... 36

5 Design .................................................................................................................................................. 37

5.1 Technical design............................................................................................................................ 37

5.1.1 Housing .................................................................................................................................. 37

5.1.1.1 Mechanical design ........................................................................................................... 37

5.1.1.1.1 Bracket ...................................................................................................................... 37

6 Electronics............................................................................................................................................ 38

6.3 Diagnostics .................................................................................................................................... 38

6.3.1 Diagnostics LIN Bus ............................................................................................................... 38

6.3.1.1 General requirements ...................................................................................................... 38

6.3.2 Self-diagnostics and fault memory .......................................................................................... 38

6.3.2.1 Fault memory management ............................................................................................. 38

6.3.2.1.1 Fault memory ............................................................................................................ 38



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1 Definitions and general assignments 1.1 Assumptions and deviations

RLS47_SPS_9 This specification describes the design, requirements and limitations of RLS Generation 4.

1.2 List of mutually applicable documents

RLS47_SPS_13 The full list of applicable documents and standards can be found in the attachment "Overview Standards". The status of the respective recognition and the release data of the standards are specified in the document.

RLS47_SPS_15 Safety rules, national regulations and similar provisions are superior to the references. They must be complied with during the product development and in preparing the release drawings.

RLS47_SPS_16 As soon as legal requirements become legally effective during or after the product development, they must be implemented immediately. Additional costs must be specified in the quotation, if necessary.

RLS47_SPS_17 The customer is responsible for ensuring that customer standards, regulations and other applicable documents are made available to Hella in their current version.



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2 General project data 2.1 Brief description

RLS47_SPS_29 This requirement specification is the description of the electronic component Rain Light Solar Humidity Display Sensor (hereinafter called the RLSHD-S).

RLS47_SPS_30

Illustration: Rain Light Solar Humidity Display - Sensor (RLSHD-S)



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2.3 Samples 2.3.1 Types of samples

RLS47_SPS_41 The following types of samples are created in this project in accordance to HP-C-333: • A-sample: Function samples that are just conditionally suitable for installation into motor vehicles, suitable for preliminary examinations, possibly simulated solutions, dummy (prototypes). • B-sample: Operative sample suitable for installation in motor vehicles, manufactured with auxiliary tools, full range of functions, terminal connections and outside dimensions correspond to series state, can be used in vehicles (prototypes). • C-sample: Manufactured with series tools under conditions close to series production conditions, suitable for release trials (pre-production sample). • Initial sample: Customer release for series production, final design, manufactured with series tools under series production conditions. • Type approval sample: Release for series production by type approval unit, final design, manufactured with series tools under series production conditions.



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3 General product data (system, device, module, component) 3.1 General product requirements 3.1.1 Brief description of the product

RLS47_SPS_2895 The sensor's task is to acquire a signal to control the front windshield wiper depending on the wetting situation in the sensor area of the windshield.

RLS47_SPS_2896 The sensor's task is to acquire a signal to control the low beam depending on the environmental brightness.

RLS47_SPS_2897 The sensor's task is recording the brightness directly in front of the vehicle, with the aim to support the brightness control of the Head Up display.

RLS47_SPS_2898 The sensor's task is to to acquire a signal to trigger the air conditioning unit for the climate on the vehicle interior.

RLS47_SPS_170 The automatic wiper control features are to be regarded exclusively as comfort functions. They do not release drivers from their operating obligations set out in traffic regulations. It remains the driver's responsibility to pay attention that the wiper system is functioning perfectly. The highest priority for switching on the wiper belongs to the corresponding operating switch. The customer must secure the functionality in the entire vehicle system.

RLS47_SPS_1333 The automatic light control features are to be regarded exclusively as comfort functions. They do not release drivers from their operating obligations set out in traffic regulations. It remains the driver's responsibility to ensure that the vehicle is illuminated correctly. The highest priority for switching on the light belongs to the corresponding operating switch. The customer must secure this functionality in the entire vehicle system.

3.1.1.1 Rain function

RLS47_SPS_174 The rain sensor takes the strain off the vehicle user by automatically switching the front wiper in rainy conditions to such an extent that almost no manual intervention is necessary, even in different rain situations.

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RLS47_SPS_175 Contamination of the sensor surface by dirt can lead to an unwanted trigger up to continuous wiping. For longer lasting dirt, the system responds with sensitivity reduction. The contamination can be caused e.g. by salt residues or insects.

RLS47_SPS_176 On account of the subjective evaluation of the wide range of different types of rain that occur (drizzle/cloudburst, raindrop size etc.) by vehicle users, not every driver will consider the rain sensor parameter settings perfect. For this reason, the sensitivity of the rain sensor shall be selectable by the driver.

3.1.1.2 Light function

RLS47_SPS_180 The sensor for light detection is an integral part of the sensor. The light sensor sends messages about different reasons for switch-on which cause the light module to activate the driving light when the main light switch is in an appropriate position. The priority for switching on the lights lies with the light module.

RLS47_SPS_181 The second sensor of the system responsible for the front light is an integral part of the light sensor system. It is used for the tunnel and bridge determination and to verify the reset of the light request.

RLS47_SPS_182

Illustration: Allocation of the individual sensors

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RLS47_SPS_183 The light sensor is a driver assistance system and is to be regarded exclusively as a comfort function, since influences which impair the view, such as fog, mist and smoke, cannot be detected. Special attention has to be drawn to this point in the operating manual of the vehicle.

RLS47_SPS_184 Due to the variety of lighting and tunnel geometries, in individual cases an impairment of tunnel detection could occur.

3.1.1.3 Climate function

RLS47_SPS_186 The humidity sensor is an optional part of the sensor. The relative humidity and temperature at the windshield is measured and communicated by a message. This information can be used by the air conditioning system in order to control the compartment climate.

RLS47_SPS_187 The solar sensor is an optional part of the sensor. The solar sensor sends a message about the sun radiation levels measured through the windshield, separately for right/left. This information is evaluated by the air-conditioning control unit and used to control the climate of the vehicle interior.

3.1.1.4 HUD function

RLS47_SPS_189 The HUD sensor is an optional part of the sensor. It sends a message about the brightness values in the front of the vehicle. The values are used for brightness control of the Head Up Display.

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3.2 Product environment 3.2.1 Overview of system interfaces to the vehicle (overall system)

RLS47_SPS_3237 The system overview illustration presents one exemplary possibility of how the sensor communicates with other system components in the vehicle.

Illustration: System overview

RLS47_SPS_212 The sensor only provides information; the sensor itself cannot intervene directly with other actuators. The respective modules (e.g. light control or wiper control) must ensure that a safe state is entered in the event of the sensor information failing.

3.2.4 Interface specification 3.2.4.2 Connection of the sensor

RLS47_SPS_333 The sensor can be powered by the superordinate control unit (LIN - Master), respectively can be connected to a switched voltage.

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RLS47_SPS_338 The responsible ECU switches off the voltage supply 5 seconds at the earliest after the LIN communication has stopped.

RLS47_SPS_334 The sensor can be powered with battery supply respectively connected to a permanently existing voltage (CL30).

3.2.4.4 Communication interface 3.2.4.4.1 LIN communication

RLS47_SPS_344 The sensor system must allocate a LIN interface for communication.

RLS47_SPS_340 All the exact timing requirements can be found in the LIN specification.

RLS47_SPS_352 At project commencement the customer provides the valid LDF (LIN definition file).

3.2.4.5 Windshield requirements 3.2.4.5.1 Transmittance and reflective properties

RLS47_SPS_3337 There are three ways of providing the factor of correction: 1. LIN signal: The factor of correction is generated on the basis of the screen samples provided by the customer and is archived inside the sensor. 2. LIN master: The factor of correction is generated on the basis of the screen samples provided by the customer and is archived inside the master. 3. The LIN master provides the sensor with 16 transmission values, and the sensor autonomously carries out the calculation.

RLS47_SPS_360 At project commencement, the customer provides Hella windshield sections of each windshield where a sensor will be mounted. Based on the windshield section, Hella will determine the transmission curve of the windshield.



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RLS47_SPS_3338 The windscreens provided by the customer at project commencement and measured by Hella are defined in the "Hella customer's drawing". These windscreens are regarded as tested and compatible with the sensor. All windscreens released will be documented in the customer's drawing.

3.2.4.5.1.2 Climate comfort windshield (infrared-reflecting)

RLS47_SPS_366 When using infrared-reflecting windshields, the infrared-reflecting foil must be cut in the area of the rain sensor so that the transmission curve corresponds to the Hella windshield requirements. A windshield sections containing the cut out has to be provided by the customer.

3.2.4.5.1.4 Transmittance and reflective properties for the rain sensor

RLS47_SPS_374 The transmission spectrum of the windshield influences both the selection of the suitable wavelength range for the transmission diodes and the required electronic reinforcement of the circuit. The transmission of the windshield in the wavelength range of 800 nm - 1100 nm must not fall below 18 % and must not exceed 80 %. Deviating windshield transmission values must be necessarily agreed upon with Hella. The transmission limits must be also met by production tolerances and aging.

3.2.4.5.1.5 Transmittance and reflective properties for the light function(s)

RLS47_SPS_2886 The transmission spectrum of the windshield means for the ambient light sensor a minimum transmittance of 75% in the visible range (380...780nm) and for the front light sensor a minimum transmittance of 18% in the IR range (800...1100nm).

RLS47_SPS_2887 The transmission spectrum of the windshield means for the near field sensor a minimum transmittance of 75% in the visible range (380...780nm).

RLS47_SPS_2888 The transmission spectrum of the windshield means for the solar sensor a minimum transmittance of 18% in the IR range (800...1100nm).

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3.2.4.5.2 Radius of curvature

RLS47_SPS_379 The horizontal and vertical curvature radius of the windshield near the sensor has to be ≥ 1400 mm.

3.2.4.5.3 Windscreen thickness

RLS47_SPS_381 The sensor has been designed for a windshield thickness of 4 mm - 6mm. Other windscreen thicknesses have to be agreed upon with Hella.

3.2.4.5.4 Shade band

RLS47_SPS_383 The sensor position must not be in the transition area of the green/gray wedge (shade band).

3.2.4.5.5 Positioning of the sensor

RLS47_SPS_386 From our experience the distance between the sensor and the end of the wiper blade overpassing the sensor has to be at least DistanceOverwipe mm. Otherwise the performance of the rain sensor functionality especially at high vehicle speed could be decreased (false wipes, double wipes). If the minimum distance 30 mm cannot be assured an agreement with Hella and the releasing customer specialist department is essential.

RLS47_SPS_387 The distance between the sensor and the end of the wiper blade not passing the sensor has to be at least DistanceNOverwipe mm. If the minimum distance 50 mm cannot be assured an agreement with Hella and the releasing customer specialist department is essential.

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RLS47_SPS_1218

RLS47_SPS_1219

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RLS47_SPS_1220

RLS47_SPS_388 The rotation of mounted sensor around the X-axis must not be greater than ± 5°.

RLS47_SPS_1252 The rotation of mounted sensor around the Z-axis must not be greater than ± 2°.

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RLS47_SPS_1217

RLS47_SPS_2589 The minimum time between two overwipes within one wipecycle has to be 350 ms.

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3.2.4.5.7 Inclination angle of the windscreen

RLS47_SPS_393

Illustration: Angle definition

RLS47_SPS_396 The light optics has been designed for windshields at an inclination angle (a) of 22° - 32°. The application in vehicles with different windshield angles can lead to different ranges for tunnel detection.

RLS47_SPS_398 The customer provides Hella with the windshield inclination angle of the different vehicles to be applied to.

3.2.4.5.8 New types of windscreens

RLS47_SPS_400 When new windshield types are introduced, e.g. different transmission, change of windshield supplier, heated front window, photochromic windows etc., an agreement with Hella and the releasing customer specialist department is essential.

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3.2.4.5.9 Cutout of the blackprint

RLS47_SPS_3292 The black screen printing applied to the inner side of the windshield to hide the circular adhesive ring has to have an opening for the sensor of (∅ = 28 mm ± 0,2 mm). If the black screen printing is not applied to the inner side of the windscreen, an alignment with Hella is necessary.

3.2.4.7 Bracket requirements 3.2.4.7.5 Requirements concerning the gluing process of the fixing element to the windshield

RLS47_SPS_445 The maximum force (including tolerances) of the sensor's spring affecting the ring is 30-60N. The mounting force and weight of an optional design cover must be added. The max. weight of the sensor is max. 18 g. The windshield supplier is responsible for: - the selection of the ring material - the selection of the ring coating/primering. - the selection of the adhesive - the gluing processSeite 19fffffffff The area on the WS inside the ring diameter 34,7mm has to be free of glue and pollution before snapping the sensor into the ring

3.3 Climate properties 3.3.1 Temperatures

RLS47_SPS_451 The valid temperature range of the sensor for operation and storage is between the following values: · Operating temperature range: TU = -40 °C to TO = +85 °C · Sensor in installation position, no operation: TU = -40 °C to TO = +100 °C

RLS47_SPS_452 The valid storage temperature range of the sensor is between the following values: · Temperature range for storage and transport is depending on temperature stability of packaging material and transport cover. · Storage temperature in the original package: -40°C to 85°C

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3.3.2 IP protective rating (protection against foreign bodies, contact and water)

RLS47_SPS_454 The sensor has the class of protection IP 50.

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4 Functional description 4.1 Functional properties 4.1.1 Operating modes

RLS47_SPS_926 At least 8 different vehicle types (parameter sets) shall be reserved. The type is selected by VehicleID.

4.1.1.3 Normal operation

RLS47_SPS_1215 The sensor must be fully operational in the voltage range from 9 V to 16 V.

RLS47_SPS_486 The maximum power consumption must not exceed the requirements of 50 mA at room temperature.

4.1.1.6 Sleep mode

RLS47_SPS_495 The power consumption must not exceed the quiescent current requirements of 100 µA at room temperature.

4.1.2 Rain function 4.1.2.1 Physical basic principle

RLS47_SPS_500 The function of the rain sensor is based on the principle of total reflection in the windshield. The light is totally reflected on the clean and dry optical boundary surface glass/air (exterior of the windshield) and is focused almost on the receiver diode through the respective lenses.

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RLS47_SPS_501 If there are water drops on the outside of the windshield in the sensor measuring range, the part of the light beam is decoupled in the area of the water drops (see image rain sensor). This reduces the amount of light absorbed by the receiver diodes. This change in light intensity is measured by the electronic evaluation unit. The wiping frequency is controlled depending on this evaluation.

Illustration: Rain sensor

4.1.2.2 Calibration and adjustment of the rain sensor 4.1.2.2.1 Rain channel calibration

RLS47_SPS_510 The sensor has been designed to work on windshields with different transmissions (e.g., clear glass / green glass ...). The initial adaptation of the sensor to the windshield transmission is referred to as calibration.

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RLS47_SPS_518 The calibration must be completed within 1.0 seconds.

RLS47_SPS_520 Note: If the conditions for the calibration on the windshield are created, it is essential that the windshield is clean and dry in the area of the measuring surface and the environmental temperature in the middle temperature range is (15 - 25 °C).

4.1.2.2.2 Rain channel adjustment 4.1.2.2.2.1 Adjustment to windscreen condition

RLS47_SPS_527 The rain sensor adapts permanently to the respective windshield state. A sudden change of the windshield state (e.g. through scratches on the windshield, stone impacts, residue of insects or soiling) is taken into account through corresponding adjustment routines. The sensor shall not request continuous wiping in this case.

4.1.2.3 Activation of the rain sensor

RLS47_SPS_541 The activation of the rain sensors automatic mode is done via a LIN signal (See ComDiag eg Klemme R).

RLS47_SPS_2751 Automatic Mode: In automatic mode the wipe requests are generated by the sensor dependent on the moisture/water situation on the windshield. The automatic mode could be selected by the driver by e.g. a switch. Manual Mode: In manual mode the wipe requests are generated dependent on the wiper lever position. In this case the sensor is in passive mode.

RLS47_SPS_542 Activation wiping is triggered as soon as it was changed to the automatic mode. The function can be disabled by parameter enable_activation_wipe_bt.

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4.1.2.4 Threshold values and sensitivity

RLS47_SPS_549 The sensitivity of wiper actuation depends on the following states of the rain function: · Sensitivity setting · Speed · Tunnel detection · Ambient brightness · Dirt detection · Salt detection and · Device state.

RLS47_SPS_550 The rain sensor must reserve the following thresholds for: • trigger of the first wipe after the beginning of rain

RLS47_SPS_1222 • all other single wiping requests

RLS47_SPS_1223 • switching to continuous wiping minimum speed

RLS47_SPS_1224 • switching to continuous wiping maximum speed

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4.1.2.4.2 Dependency on the light situation

RLS47_SPS_559 The rain sensor must reserve parametrizable the sensitivity depending on the three possible light situations Day, Twilight and Night. The image below shows a possible parameterization.

Illustration: Threshold values for drop detection.

4.1.2.4.3 Dependency on the vehicle speed

RLS47_SPS_561 The sensitivity of the sensor depends on the vehicle speed. The rain sensor must preserve parameters to configure the sensitivity depending on the vehicle speed.

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4.1.2.5 Wiping process 4.1.2.5.1 Parking position signal

RLS47_SPS_341 The timing of the parking information of the wiping motor is very important for the function of the sensor. Special attention regarding the park information timing must be paid during the function's development and testing.

RLS47_SPS_569 As soon as the wiper which passes the sensor leaves the parked position, the rain sensor has to be informed about this by a corresponding signal WiperPosition.

RLS47_SPS_570 As soon as the wiper which passes the sensor returns to the parked position, the sensor has to be informed about this by the corresponding signal WiperPosition being reset.

RLS47_SPS_572 The following minimum conditions are necessary for the functionality of the wiping process: The signal "wiper outside the parked position" reaches the rain sensor at least 100 ms before the sensor is wiped over by the wiper. The signal "wiper in the parked position" is only set after the wiper has wiped over the sensor twice. The signal "wiper in the parked position" is also put out at least once during continuous wiping (stage 1 or 2) if the wiper passes through the parked position.

RLS47_SPS_573 For wiper systems which have different parking and reversing positions for the wiper blades, an agreement with Hella and the releasing customer specialty department is essential.

RLS47_SPS_574 If the wiper blade which passes the sensor is not moved synchronously to the park position signal into/out of the park position, an agreement with Hella and the releasing customer specialty department is essential.

4.1.2.6 Wiper control

RLS47_SPS_584 When the rain sensor is activated, the wiper system is controlled according to the detected degree, type and frequency of wetting of the windshield.

RLS47_SPS_585 The sensor can put out the following wiper requests:

RLS47_SPS_1238 Single wiping processes (stageless interval pauses)

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RLS47_SPS_1240 Continuous wipe in stage 1

RLS47_SPS_1241 Continuous wipe in stage 2

RLS47_SPS_1239 Multi-stage systems with max. MaxWipSteps steps. (MaxWipSteps = MWS_max_u8 - MWS_min_u8 + 1)

RLS47_SPS_586 The rain sensor must adjust the wiping behavior to the detected windshield states: • (wax) streaks • dirt • salt. The function has to be adjusted for typical situations for salt, dirt and streaks.

4.1.2.9 Splash detection

RLS47_SPS_627 The splash function is necessary for the following reason: The transitions to continuous wiping are usually carried out through rain intensity calculation. These (due to a state-controlled filter) are subject to an inertia which restricts the capacity to react in the case of a sudden wetting of the windshield, if no wiping or individual wiping was taking place when this occurs. A splash situation is represented by a sudden strong rain impact.

4.1.2.11 Dirt detection

RLS47_SPS_645 If the vehicles in front swirl up damp dirt, a wiping process is triggered according to the humidity - on account of the typical rain detection function. If this occurs often, it leads to the dirt being smeared. A dirty windshield leads to an increase in outcoupling during a wiping process (i.e. to a greater delta). To compensate for this, dirt detection is used to adapt the delta of the rain recognition function to the dirt situation, so that the rain recognition functions perfectly despite dirt on the windshield.

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4.1.2.12 Salt detection

RLS47_SPS_1232 In the winter months, the windshield can become soiled by the use of de-icing salt. This soiling could trigger wiping processes. In order to prevent this, the sensitivity is adjusted by means of the salt detection so that the rain detection functions despite the salt on the windshield and to avoid the faulty wiping processes as much as possible.

4.1.2.13 Dew detection

RLS47_SPS_654 The dew detection shall avoid the wiping caused by invisible moisture on the windshield. Invisible moisture is not visible for the driver, but visible in the infrared measurement signal of the rain sensor.

4.1.2.14 Wiper start-up suppression

RLS47_SPS_658 The function wiper start-up suppression should prevent the windshield wiper to start if there is ice on the window which could damage the wipers. Such ice situations generally occur after a longer period of vehicle standstill in case of negative environmental temperatures.

4.1.3 Light function

RLS47_SPS_720 The light function must put out the request to switch on the light by using the communication interface depending on the following environmental respectively driving conditions:

RLS47_SPS_722 • Twilight • Darkness

RLS47_SPS_723 • Tunnel

RLS47_SPS_721 • Basement garage exit

RLS47_SPS_724 • Rain



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RLS47_SPS_725 • High speed

4.1.3.1 Physical basic principle 4.1.3.1.1 Ambient light sensor

RLS47_SPS_2954 Definition of the opening angels - Azimuth and elevation



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4.1.3.3 Threshold value and sensitivity 4.1.3.3.1 Speed dependence

RLS47_SPS_756 The light sensor allows configuration of sensitivity curve depending on the vehicle speed by a change of parameters at the points 1 and 2.

Illustration: Example of a sensitivity curve of the light function

4.1.3.3.2 Dependence on the sensitivity setting

RLS47_SPS_760 The light sensor has to provide maximum 6 sensitivity sets.

4.1.3.5 Light basic function

RLS47_SPS_775 The light sensor must put out the switch-on request for the driving light if the ambient light level decreases under a minimum illumination level DayOff_Sens.



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4.1.3.7 Tunnel light

RLS47_SPS_786 Tunnel detection: Tunnel detection is based on the following sequence of light conditions: Front light value drops to a certain percentage value (parameter tun_front_adaptiv_u8) Ambient light value drops to a certain percentage value (parameter tun_front_adaptiv_u8) After a certain entry time tun_in_time_u8 the above conditions are checked again. If they are still being met, a tunnel is detected.

4.1.3.8 Underground parking garage exit

RLS47_SPS_797 Underground parking garage exit: A typical situation for this is described below: The car is started up in the dark and the light is switched on automatically. In order to prevent that the front light remains on for minutes after the exit from the garage, there has to be a quicker transition from Night to Day. This quicker path goes through the GarageExit state. Characteristic for an underground parking garage exit is the fast increase in light, both ambient and front light, within the starting distance (typically within the first 1000 meters after ignition on). If the sensor detects an underground parking garage exit, the system changes to the GarageExit state. This state is a purely waiting state (typically 5 seconds). If the light conditions for Day are detected within this state, then the system changes to the Day state when the waiting time has expired. Otherwise the Twilight state is entered.

4.1.3.11 Instrument lighting

RLS47_SPS_820 Additional switching thresholds for - dimming display - compartment lighting can be provided from the twilight steps.



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4.1.4 Climate function 4.1.4.1 Solar sensor

RLS47_SPS_823 The solar sensor provides an additional reference variable for the air-conditioning system. This variable correlates with the solar radiation absorbed by the passengers. It mainly leads to passengers warming up, rather than to the vehicle interior heating up. This effect is not recorded by the interior temperature sensor. Using the information provided by the solar sensor, it is possible to influence the vehicle climate depending on the sun radiation in such a way that this undesired warming effect on the passengers by the sun is compensated.

RLS47_SPS_825 The solar sensor records the solar radiation acting on the passengers separately for the left and right sides (Solar_Driver_u8, Solar_Passenger_u8) of the vehicle.

4.1.4.1.2 Measuring and detection range of the solar sensor

RLS47_SPS_836 The sensor has to cover a measurement range between 0 W/m² to 1020 W/m² (global radiation according to DIN EN 60904-3).



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RLS47_SPS_2985 The solar sensor must have the following characteristics at 27.7 ° windshield inclination:

Illustration: Directional characteristic solar sensor (channel left / driver side) Remark: Definition of angles see SPS_2954



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RLS47_SPS_2986 The solar sensor must have the following characteristics at 27.7 ° windshield inclination:

Illustration: Directional characteristic solar sensor (channel right / passenger side) Remark: Definition of angles see SPS_2954

RLS47_SPS_843 The sensor signal reaches its maximum value at an angle of incidence theta = 45° to 65° and a sun track of phi = -50° to -80° at standard windshield angle 27.7 °.

RLS47_SPS_844 At lower angles of incidence of theta ≈ 25° and a sun track of phi = -60° to -70°, approx. 55 % of the signal maximum is put out at standard windshield angle 27,7 °.



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4.1.4.2 Humidity function

RLS47_SPS_848 The humidity sensor delivers two reference variables for the control of the air conditioning. The relative humidity and the temperature are measured on the inner surface of the windshield. In case of high relative humidity it is possible that condensation is formed on the windshield. With the information from the humidity sensor it is possible to regulate the vehicle air conditioning depending on the relative humidity and temperature on the inner windshield so that the unwanted condensation on the windshield is counteracted before the humidity from the passengers can be observed.

RLS47_SPS_855 For the application inside the vehicle there are some recommendations: · A good air circulation under the sensor cover is necessary for the humidity and temperature measurements. Ventilation slits in the sensor cover should be made as wide as possible at the bottom and top of the design cover. · The climate sensor should be placed in the lower range of the sensor cover and as close as possible to the ventilation slits. · When a camera is additionally placed under the sensor cover, this should be placed above the sensor so that the heat of the camera can be dissipated through the upper air ventilation slits.

4.1.4.2.1 Technical requirements concerning the humidity sensor 4.1.4.2.1.1 Technical data humidity sensor

RLS47_SPS_3300 Figure: Humidity tolerance (at 25°C):



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4.1.4.2.1.2 Technical data temperature sensor

RLS47_SPS_3302 Figure: Tolerance of the temperature over the entire temperature range.

4.1.5 HUD lighting

RLS47_SPS_877 In vehicles equipped with head-up display (HUD), the brightness of the image projected onto the windshield is controlled by an external light sensor. Following this sensor is named HUD sensor. The reception characteristics of this HUD sensor is changed compared to the characteristics of the front light sensor. The HUD sensor detects the brightness in the immediate front area of the vehicle. The aim is the acquisition by means of sensors as input of the control of the contrast/representation brightness of a head up display concerning the vehicle information.

RLS47_SPS_3339 A opening angle of 8° (± 1°) must be implemented for the HUD function.



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5 Design 5.1 Technical design 5.1.1 Housing 5.1.1.1 Mechanical design

RLS47_SPS_931 The sensor consists of a 3K housing with integrated optics, a cover with integrated connector shroud and a circuit board with the electronic components.

RLS47_SPS_2890 The housing shall be made of black PC.

RLS47_SPS_2891 The optics of the rain channels shall be made of IR-transparent PC.

RLS47_SPS_2892 The ambient light lens shall be made of clear PC. The front optics shall be made of IR-transparent PC.

RLS47_SPS_2893 The nearfield lens shall be made of clear PC.

RLS47_SPS_2894 The optics of the solar function shall be made of IR-transparent PC.

RLS47_SPS_934 The sensor is pressed on the windshield by the spring which is snapped onto the fixing element (bracket).

5.1.1.1.1 Bracket

RLS47_SPS_939 The bracket (fixing element) is glued onto the windshield by the windshield manufacturer or by the customer using a suitable adhesive. The windshield manufacturer or the customer is responsible for the adhesive surface and the surface coating of the ring. The windshield must be free of adhesive and soiling (dust, grease, etc.) inside the fixing element.



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6 Electronics 6.3 Diagnostics 6.3.1 Diagnostics LIN Bus 6.3.1.1 General requirements

RLS47_SPS_2690 During sensor production UDS frames are used to write or read production data. These UDS frames must not be accessible by the customer.

6.3.2 Self-diagnostics and fault memory 6.3.2.1 Fault memory management 6.3.2.1.1 Fault memory

RLS47_SPS_1090 The following errors are considered in the fault memory:

RLS47_SPS_3029 Hardware error rain sensor

RLS47_SPS_3030 No optical initialization possible

RLS47_SPS_3031 Over temperature

RLS47_SPS_3032 Overvoltage

RLS47_SPS_3033 Hardware error system error

RLS47_SPS_3034 Calibration error of light sensor

RLS47_SPS_3043 Hardware error of the humidity sensor

RLS47_SPS_3044 Hardware error HUD sensor

RLS47_SPS_3036 Hardware error ambient light sensor

RLS47_SPS_3037 Hardware error front light sensor



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RLS47_SPS_3038 Hardware error solar sensor

Documents

System Requirements Date: Specificationibb.iveco.com/Body Builder Instructions/Central Europe/DAILY/Rain Light Solar Humidity...Hella KGaA Hueck & Co. 59552 Lippstadt System Requirements