BMW E65 User Manual download pdf (Page 4)

E65 Bus Systems

Advantages of Bus Systems

• Greater reliability of the overall system

• Simplification of wiring systems

• Reduction of the number of separate cables

• Reduction of the cross-sectional areas of wiring looms

• Greater versatility in terms of cable routing

• Multiple use of sensors in the vehicle, thereby reducing the number of duplicated

sensors

• Use of shared interfaces by signals, thereby reducing the number of interfaces

• Transmission of complex data

• Greater flexibility in the event of system modifications

• Data volume can be expanded at any time

• Flexible configuration of control units

• Adoption of new functions for customers

• Efficient diagnosis

• Lower hardware costs

The E65 introduces three (3) new bus systems. Two of them are based on fiber-optic tech-

nology. The two new fiber-optic bus systems are called:

MOST bus (Media Orientated System Transport) and " byteflight" (safety systems bus).

The third bus system consists of two insulated copper twisted-pair wires and is called the:

K-CAN (Body-Controller Area Network). The K-CAN bus replaces the single wire K bus

(body bus) and is subdivided into two sections: the K-CAN System and the K-CAN

Periphery.

The powertrain control units continue to use a CAN bus called the PT-CAN, except that

now it is a three wire bus to include a KL-15 wake-up wire.

Comparison of E38 and E65 bus systems

E38 E65

CAN PT-CAN

I-Bus

K-Bus K-CAN System

P-Bus K-CAN Periphery

------- MOST Bus

-------

byteflight

D-Bus D-bus

1 2 3 4 5 6 7 8 9 ... 50 51

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BMW E65 User Manual Page 4