3 Series E90 320d (M47T2) SAL
On E46 vehicles:
-
DME control unit
The DME control unit (digital engine electronics) calculates the amount of fuel required based on the driver's
request and the operating status of the engine.
-
Local CAN
The EKP control unit communicates with the DME control unit via the local CAN.
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K-bus (body bus)
Diagnosis is performed through the K-bus. In the event of a crash, the EKP control unit is deactivated by the K-
bus.
In the E60, E61, E63, E64, E87, E90, E91:
-
DDE control unit
The DDE control unit (digital diesel electronics) calculates the amount of fuel required based on the driver's
request and the operating status of the engine.
-
PT-CAN
The EKP control unit communicates with the DDE control unit via the PT-CAN (Powertrain CAN).
The E46, E60, E61, E63, E64, E87, E90 and E91 have the following in common:
-
EKP control unit
The EKP control unit controls the speed of the electric fuel pump in accordance with the DME or DDE fuel
volume calculation. [more ...]
-
Regulated fuel pump
The controlled fuel pump is a system comprising an electric fuel pump and control unit in which the fuel pump
not only pumps, it also pumps more or less depending on the requirements.
The following types of fuel pump are installed:
•
E46: side channel pump (2-speed fuel pump)
•
E60, E61, E63, E64: roller-cell pump
•
E87, E90, E91: G-rotor pump
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)
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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.
SBT Electronically controlled fuel pump E46, E60, E61, E63, E64, E87, E90, E91
BMW AG - TIS
23.01.2013 20:23
Issue status (12/2007) Valid only until next DVD is issued
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