GF42.45-P-3500SK ASR Closed-Loop Operation Function

GF42.45-P-3500SK ASR closed-loop operation function

Acceleration slip regulation (ASR) closed-loop operation
If one of the drive wheels tends to spin when starting off or accelerating, the ESP and BAS control unit (N47-5) introduces the ASR pressure buildup closed-loop operation in the respective rear axle brake caliper. As a result the other wheel can transmit the optimum drive force (locking differential effect). Via control valves in the traction system hydraulic unit (A7/3) of the ESP and BAS control unit (N47-5) the braking torque is regulated by pressure buildup, pressure holding and depressurization.

Detecting and processing sensor signals and switch conditions
The ESP and BAS control unit (N47-5) reads in the signals of the motor electronics control unit (N3/10) via the Controller Area Network bus class C (engine compartment)(CAN-C) and evaluates them.

Controller Area Network (data bus/CAN bus) message "engine torque"
Detection of engine torque delivered (is required for setting a reduced engine torque)

CAN-message "accelerator pedal position"
Detection of accelerator pedal position which is used to detect the engine torque required by the driver

CAN message "transmission ratio"
The signal from the ETC [EGS] control unit (N15/3) or electronic selector lever module control unit (N15/5) serves to detect the gear currently engaged.

The information is required to calculate the driving power acting on the drive gears and to control the drive moment.

Activation and deactivation of drive torque control
After evaluating the information read in the ESP and BAS control unit (N47-5) activates the drive torque control for the existence of a traction condition, in which the drive torque specified by the accelerator pedal position is too large.

The control is deactivated as soon as the traction condition of the vehicle permits the drive torque specified by the driver.