gf4245p2005a

Steering wheel angle sensor, basic function

Type gf · emne 42.45 · version 0104 · 2020-06-27

Gælder for: Model all (CAR)

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Placering

Funktionsgruppe 2 Chassis › 42 Bremsehydraulik og -mekanik › 42.45 Elektronisk stabilitetsprogram (ESP), stabilitetsregulering (SR) — Serie 900 (modeller 9**) · Serie 902 (modeller 9**) · Serie 904 (modeller 918, 919, 924, 925, 938, 943, 957) · Serie 906 (modeller 917, 918, 924, 953)

Gælder også for motorer/gearkasser: 139 ***, 254 ***, 256 ***, 272 ***, 276 ***, 282 ***, 457 9**, 541 9**, 542 9**, 608 ***, 700 4**, 700 420, 700 421, 700 422, 700 423, 715 3**, 715 5**, 722 6**, 722 9**, 724 ***, 724 0**, 724 033, 724 044, 724 045, 724 1**, 724 103, 724 114, 724 115, 724 120, 725 ***, 725 0**, 725 035, 725 037, 725 038, 725 085, 725 1**, 739 390, 739 391, 739 395, 739 396, 739 397, 739 398, 739 399, 740 698, 743 3**, 743 4**, 743 498, 746 971, 924 9**, 924 910, 925 9**, 926 9**

GF42.45-P-2005A

Steering wheel angle sensor, basic function

22.06.2020

Model

all (CAR)

Steering wheel angle sensor, basic function

P42.45-A005-79

Example illustration of steering wheel angle sensor

1

Steering wheel angle sensor

Overview

This document contains information on:

General

Function

General

The steering wheel angle sensor (1) detects the current position of the steering wheel.

Function

The angle measurement is based on two evaluations:

Code disk measurement for exact angle determination to 360°

Turn measurement for absolute angle determination to 720°

Steering wheel angle sensor, basic function

P46.10-A036-78

2

Turn indicator

4

Code disk

3

PDA-line

5

Lens body

Steering wheel angle sensor, basic function

View of lens body

3

PDA-line

4

Code disk

6

Fiber optic cable

7

LED

P46.10-A037-81

Code disk measurement

The light emitted by one of the LEDs (7) integrated in the lens body (5) is deflected and parallelized by the optical fiber (6). The light shines through the punched code disk (4) and the PDA (3) can take a very accurate picture.

The PDA (3) converts the projected image of the code disk (4) into a digital data stream and forwards it for processing.

Turn measurement

The turn indicator (2) projects a focused light beam onto the PDA (3). Due to a worm gear, the position of the light beam on the PDA (3) depends on which turn the steering is currently in.

The absolute angle of the steering wheel is determined by combining the code disk measurement and the turn measurement. The steering wheel angle is recorded with a resolution of 0.1° and a scanning rate of 100 Hz (scan duration of 10 ms). The steering wheel angle sensor (1) provides the steering column tube module control unit with a voltage signal that is proportional to the steering wheel angle.