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Steering wheel angel sensor: Function

The steering wheel angle sensor comprises a ring gear (1) mounted on the steering column shaft. Two gears with different numbers of teeth (2a has 28 teeth and 2b 26 teeth) engage this ring gear. Each gear has a permanent magnet (3a and 3b) and sensor, the resistance of which depends on the magnetic field.

Fig 1: Identifying Steering Wheel Angle Sensor Ring Gear
G03667872Courtesy of SAAB-SCANIA OF AMERICA, INC.

Since the two gears 2a and 2b have different numbers of teeth, the relative positions of the permanent magnets will be unique for each steering wheel angle. Accordingly, the position of the steering wheel can be put out on the P-bus. This information is used by the ESP control module.

Fig 2: Illustration For Step 4
G03667873Courtesy of SAAB-SCANIA OF AMERICA, INC.
Fig 3: Circuit Diagram
G03667874Courtesy of SAAB-SCANIA OF AMERICA, INC.

The steering wheel angle sensor contains a microprocessor with self-diagnosis function. The microprocessor sends information over the P-bus.

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