Electric Parking Brake System Description - Clutch Pedal Stroke Sensor
The clutch pedal stroke sensor is located in the clutch pedal bracket. The clutch pedal stroke sensor detects the level of clutch pedal force and outputs two kinds of voltage values depending on the given angle.
For M/T vehicles, the clutch pedal stroke sensor determines the clutch engagement status, the back-up light switch determines if gear is in forward or reverse, and the neutral position sensor determines if the gear is engaged. Based on these inputs, the electric parking brake system adjusts the engine torque according to the road gradient and the clutch engagement point to set the timing to cancel the electric parking brake. The electric parking brake control unit sends the clutch pedal stroke sensor value to the PCM via F-CAN. Since the electric parking brake control unit is equipped with the clutch pedal stroke sensor, it has the following learning values, which are obtained by its auto learning functions:
Clutch engagement point learning:
The electric parking brake control unit detects the longitudinal g-force that is created when the clutch is engaged every time the vehicle starts moving on level ground in order to determine that the clutch is engaged and then to correct the engagement point information. The learning value is updated every time the vehicle starts moving on level ground.
Clutch pedal stroke sensor zero point learning:
To correct variances in output values among clutch stroke sensors, the electric parking brake control unit identifies the at rest and fully-pressed positions of the clutch pedal to keep voltages updated with corrected ones.