G30.35-3153-78
1 | Accelerator pedal sensor, signal | A3 | Drive control (CPC) control unit | B44 | Accelerator pedal sensor | ||
2 | Exhaust aftertreatment, status | A4 | Engine management control unit (MCM) | CAN 4 | Drive train CAN | ||
3 | Maximum available engine torque, status | A60 | Exhaust aftertreatment (ACM) control unit | Z4 | Drive CAN bus star point | ||
4 | Engine target torque, request |
General
The target engine torque is a value that is calculated by the drive control control unit (CPC) (A3).
This value represents the driver's request (e.g. accelerate) taking into account the current driving condition.
The control unit for the drive control (CPC) (A3) provides the engine management (MCM) control unit (A4) with the current specified engine torque for calculating the corresponding variables for the engine timing.
Function
The control unit for the drive control (CPC) (A3) determines the current position of the accelerator pedal from the pulse width modulated signal of the accelerator pedal sensor (B44). As well as the accelerator pedal position, the drive control control unit (CPC) (A3) evaluates additional information, which can limit the target engine torque depending on the situation:
Vehicle speed
Exhaust aftertreatment status
Further influencing factors depending on the field of application of the engine
The maximum available engine torque is evaluated in addition to this information. The information concerning the maximum available engine torque is provided by the engine management control unit (MCM) (A4).
The engine management control unit (MCM) (A4) evaluates the current coolant temperature, the fuel temperature and the engine rpm to do this.
The engine management (MCM) control unit (A4) then transmits the maximum available engine torque to the control unit for the drive control (CPC) (A3).
The drive control control unit (CPC) (A3) uses the sum total of the listed information to calculate the relevant target engine torque.
The control unit for the drive control (CPC) (A3) transmits this request to the engine management (MCM) control unit (A4), which then calculates the variables for the injection quantity.
The calculated target engine torque is output as a positive value. If the accelerator pedal is not operated, the target engine torque is specified as "0", and in deceleration mode the target engine torque is shown as a negative value.