BMW 7 Series: Operating Principle Of Optical Steering Angle Detection
Steering angle detection
The code disc enables a 4-digit digital code to be generated for each light field. The 12- digit digital code is formed by lining up the 4-digit digital codes. The steering-angle speed can be ascertained from the changes to the individual digital codes.
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Fig. 135: Operating Principle Of Optical Steering Angle Detection
COMPONENTS DESCRIPTION CHART
- Code disc
- Digital code for light field 1
- Digital code for light field 2
- Digital code for light field 3
- 12-digit digital code
Block diagram of steering angle detection
The following block diagram shows the steering angle detection in simplified form.
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Fig. 136: Steering Angle Detection Block Diagram
COMPONENTS DESCRIPTION CHART
- Sliding register
- Schmitt trigger
- Photo-transistor
- Code disc
- Light-conducting element
- LED (infrared)
- Sensor circuit board
- Activation of LED
The LED (8) is supplied with pulse-width modulated voltage, thus also supplying the light-conducting element (5) with infrared light. The light-conducting element projects the light onto the code disc (4). The phototransistors (3) pick up the light signals.
The signals of the photo-transistors are processed in the downstream electronics (2) into the signals "1" or "0".
The signals of the 12 photo-transistors are put together to form the digital code.
The sliding register (1) picks up the digital code and forwards it to the electronics of the steering column switch cluster.
Steering Wheel
Depending on the vehicle equipment, the following components are located in the steering wheel:
- Button block for telephone/radio
- Button block for cruise control system/Active Cruise Control
- Airbag with associated priming caps
- Horn button
- Vibration actuator for lane departure warning
- Steering wheel electronics
- Steering wheel heating.
Steering Wheel Structure
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Fig. 137: Identifying Steering Wheel Important Components F01/F02
COMPONENTS DESCRIPTION CHART
- Steering wheel heating
- Button block for cruise control
- Airbag unit
- Vibration actuator for lane departure warning
- Steering wheel electronics system
- Button block for telephone/radio
The button blocks as well as the steering wheel electronics are linked across the LIN bus to the electronics in the steering column switch cluster.
With the corresponding request, the steering wheel electronics control and monitor the function of the vibration actuator and steering wheel heating.
The priming caps of the airbags are connected directly and are activated by the Crash Safety Module, ACSM.
The fanfare-horn button is evaluated by the electronics of the steering column switch cluster.
READ NEXT:
Steering Wheel Button Block
Button block for driving functions
The steering wheel contains a button block for the Dynamic Cruise Control (DCC)
or Active Cruise Control
(ACC) Stop&Go functions. The button block is located on
Electrical Steering Column Adjustment
System Circuit Diagram for Electrical Steering Column Adjustment
Fig. 140: Electrical Steering Column Adjustment System Circuit Diagram
COMPONENTS DESCRIPTION CHART
Central gateway module ZGM
Fron
SEE MORE:
Introduction
HISTORY
With the launch of the E65, an optical bus (MOST) was used for the first time
in a series production vehicle for
the purpose of transmitting digitized audio signals.
With the introduction of the E93 in 2007 a USB interface for external audio
devices was offered for the first
time in BMW v
Electrostatic Discharge (ESD)
It is essential to follow ESD (Electrostatic Discharge) guidelines when
replacing individual components in order
to avoid damage to internal components of the CIC. These requirements also apply
when storing or sending
back components.
Special packaging (ESD bags, ESD boxes with film or foam materi
