Hardware Changes

HARDWARE CHANGES







The only hardware change involves wheel speed detection. The E38 uses hall effect sensors instead of the traditional inductive pulse sensors.

The use of hall sensors for wheel speed detection offers several advantages:
- The hall sensor produces a digital signal that can be directly processed by the control module.
- The voltage amplitude of the hall sensor is not influenced by increasing road speed.
- The hall sensor is not subject to induced voltage spikes.

SUBJECT: E38 INTRO - Wheel speed sensor operation update







The E38 Features Handout states that the Hall Effect Sensor used for the wheel speed input acquires ground connection through the case of the sensor.

The two wire hail sensor receives 8 volts from the ABS control module through one wire. The ground path for the sensor is through the second wire back to the control module.

The signal is generated by the pulse wheel affecting the voltage flow through the hall element. This affect creates the square wave signal with a low of .75 volts and a high of 2.5 volts.

The unique feature of this hall element is its shared ground/signal wire to the control module.

Please incorporate this information into the existing E38 Introduction course.