GF42.45-D-0001H Electronic Stability Program (ESP) Function
GF42.45-D-0001H Electronic Stability Program (ESP) Function
The electronic stability program (ESP) is an active safety system for improving vehicle stability under all driving situations. It can access the brake system and engine management system. Among other things, the ESP stabilizes the vehicle when cornering, braking or coasting by applying the brake at one or more wheels on the front axle and/or rear axle. This holds the vehicle safely on course.
The following system functions are integrated in the ESP:
^ Start-off assist (AAS), with code (E07) Starting-off aid
^ Antilock brake system (ABS)
^ Electronic brake force distribution (EBV)
^ Electronic traction system (ETS), with code (ZG1) Engageable all-wheel drive, with code (ZG2) Permanent all-wheel drive, with code (ZG3) Gear reduction for all-wheel drive or with code (ZG4) Permanent all-wheel drive with gear reduction
^ Acceleration Slip Regulation (ASR)
^ Brake Assist (BAS)
^ Engine braking regulation (EBR)
The stability control function has priority over the integrated system functions.
The ESP therefore provides benefits such as:
^ Improved starting-off and acceleration capabilities by increasing traction, especially on road surfaces with different levels of grip and when cornering
^ Automatic adaptation of engine torque depending on the traction condition of the wheels
^ Reduced risk of skidding under all road conditions by means of automatic stabilization when braking, accelerating or coasting
^ Reduced brake distance in corners or on roads with a slippery surface
^ Improved directional stability of the vehicle when cornering, also up to the critical limits
^ Improved active dynamic safety since only a wheel which is not spinning can provide optimum traction with no loss of lateral stability
^ The ASR function can be deactivated using the ASR OFF button (N72/1s5); the ESP indicator lamp (A1e14) in the instrument cluster (A1) lights up permanently to indicate deactivation. Deactivation of the ASR can improve traction (grinding effect) in deep snow or when snow chains are fitted.
The ESP control unit (N30/4) communicates with the following control units via the Controller Area Network bus class C (engine compartment) (CAN-C):
^ CDI control unit (N3/20), with OM 642
^ CDI control unit (N3/21), with OM 646
^ ME-SFI [ME] control unit (N3/23), with M 272
^ ETC [EGS] control unit (N15/3), with transmission 722.6
^ ESM [EWM] control unit (N15/5), with transmission 722.6
The following sensors are read in by the ESP control unit in order to determine the driver's request:
^ Steering angle sensor (N80b1)
^ Accelerator pedal module (B37/3)
^ Throttle valve actuator (M16/5)
^ Transmission neutral position switch (S164)
The following sensors are read in by the ESP control unit in order to determine the actual vehicle behavior:
^ Yaw rate, lateral and longitudinal acceleration sensor (B24/15)
^ Left front rpm sensor (L6/1)
^ Right front rpm sensor (L6/2)
^ Left rear rpm sensor (L6/3)
^ Right rear rpm sensor (L6/4)
^ Brake pressure sensor
