Accelerator pedal sensor component description - GF30.20-P-2010BK

ENGINE 113.967 in MODEL 219

ENGINE 113.964 in MODEL 164.1

ENGINE 113.971 in MODEL 251

Location

The accelerator pedal sensor is located at the top of the accelerator pedal module.

Task

Detecting the accelerator pedal position and relaying corresponding voltage signals to the motor electronics control unit.

Fig 1: Identifying Accelerator Pedal Sensor Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown: the internal circuit in the accelerator pedal sensor (Hall principle)

Fig 2: Internal Circuit In Accelerator Pedal Sensor (Hall Principle)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Design - Accelerator Pedal Sensor Component

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Design

The accelerator pedal sensor converts the mechanical operation input by the accelerator pedal into an electrical voltage corresponding to the accelerator pedal position.

The accelerator pedal sensor operating on the Hall principle is integrated in the pedal lever shaft and consists of a shaft with a ring magnet. This rotates in a printed circuit board with stator in the fixed Hall elements. This produces a change in the voltage.

Function

The accelerator pedal sensor is supplied via pin 1 from the ME control unit

with 5 V. Pin 3 and 6 are ground connections.

The information of the accelerator pedal position is transmitted to the motor electronics control unit in the form of two signals (pin 5 with signal 1 has maximum approximately 4.8 V and pin 4 with signal 2 maximum approximately 2.4 V).

In the accelerator pedal sensor, the supply voltage for sensor 2 is split in half.

Signal 1 ranges are defined as percentages of the supply voltage (approx. 5 V) as follows:

up to 4 % the signal is too small via short-circuit to ground or via line interruption
4 to 9.4 % idle range
9.4 to 81 % partial load range
81 to 96 % full-load range
above 96 % the signal is too high via short-circuit to positive.

In the event of an error at signal 1, a switchover to signal 2 takes place and emergency mode is activated.

Kick-down detection takes place via the accelerator pedal sensor, is signals 1 and 2 fall within full load range for a certain period.

If the brake pedal is operated, only idle values will now be accepted by the accelerator pedal sensor. If required, the engine control unit generates the substitute values. The signals from the accelerator pedal sensor are rejected over this time