5.2 Common Powertrain Controller

The CPC communicates with the other MCM units installed on the vehicle over the J1587 and J1939 data link. See Figure " CPC" .

Data for specific applications is stored in the CPC. These include idle speed, maximum running speed, and speed limitation.

Figure , CPC

The CPC receives data from the following sources:

The operator (accelerator pedal position, engine brake switch)

Other electronic control units (for example, the anti-lock brake system)

The MCM (oil pressure and coolant temperature)

From these data, instructions are computed for controlling the engine and transmitted to the CPC via the proprietary datalink.

The CPC controls various systems, for example, communications with the datalink, the engine brake, and the constant-throttle valves.