System function

The electronically controlled fuel pump system comprises the following functions:

• Delivery of fuel according to requirements
• Cooling and lubrication of high-pressure pump (diesel engine)
• Emergency operation

  Delivery of fuel according to requirements 

  Amount of fuel required by the engine is calculated by the DME or DDE control unit. The total volume required is transmitted as a message to the EKP control unit via the local CAN or PT-CAN. The EKP control unit converts this message into an output voltage. This output voltage is then used to control the speed of the electric fuel pump. This achieves a delivery which corresponds with the requirements.

  Cooling and lubrication of high-pressure pump (diesel engine) 

  On diesel engines, the fuel is also used to cool and lubricate the high-pressure pump.

  The lower limit of the amount of fuel to be delivered is not  determined by the minimum amount of fuel required by the engine. The parameters for lubrication and cooling of the high-pressure pump are also decisive factors.

  Emergency operation 

  In the event that communication with the DME or DDE fails or is faulty, the EKP control unit will switch to emergency operation. The electric fuel pump is fully activated.