BMW E65 User Manual download pdf (Page 12)

E65 Bus Systems

Examples of the Function of the Central Gateway Module (ZGM)

The DME and DSC control units both place mes-

sages on the PT-CAN. Those messages are

received by the Central Gateway Module from

the PT-CAN. The buffer memory on the Central

Gateway Module temporarily stores the mes-

sages from the PT-CAN.

They are converted by the Central Gateway

Module according to specific gateway rules and

conversion tables for the K-CAN System Bus.

As the K-CAN System Bus is slower than the PT-

CAN, the two messages are joined together and are sent out as one message. The mes-

sages reach their destinations (IHKA/Kombi) via the K-CAN SYSTEM bus.

Electronic Fuel Pump Control

The DME calculates the delivery rate of fuel required on the basis of the vehicle's operating

status. The figure calculated is sent in the form of a message to the SBSR (right B-pillar

satellite).

The original message (PT-CAN signal) is converted by the ZGM to a

byteflight

message

(fibre-optic signal). From the ZGM, the message is passed via the

byteflight

to the SIM,

which passes it to the SBSR.

The electronic evaluation unit integrated in the SBSR converts the signal to a PWM signal.

That PWM signal controls the electronic fuel pump (EKP). The required fuel delivery rate can

now be provided by the electronic fuel pump.

ZGM Buffer memory

Out going mes-

sage on K-CAN

DSC

DME

2 incoming messages

via the PT-CAN.

KT-7872

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BMW E65 User Manual Page 12