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DATA BUS SYSTEM LECTURER NAME: MR. KHAIRUL AKMAL BIN NUSI

DATA BUS SYSTEM LECTURER NAME: MR. KHAIRUL AKMAL BIN NUSI. INTRODUCTION. The use of a CAN bus system in a car makes it possible to network electronic modules such as control units or intelligent sensors such the wheel angle sensor.

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DATA BUS SYSTEM LECTURER NAME: MR. KHAIRUL AKMAL BIN NUSI

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  1. DATA BUS SYSTEMLECTURER NAME: MR. KHAIRUL AKMAL BIN NUSI

  2. INTRODUCTION • The use of a CAN bus system in a car makes it possible to network electronic modules such as control units or intelligent sensors such the wheel angle sensor. • The abbreviation "CAN" means Controller Area Network.The CAN bus system provides the following advantages for the car as an overall system: -Data exchange between control units take place on a uniform platform.This platform is call a protocol. The CAN bus acts as a so-called data highway -System expansions are easier to implement in the form of optional extras. -The CAN bus is an open system which permits adaptation to various transmission media such as copper or optical fibre cables. - A cross-system diagnosis is possible across several control units.

  3. Benefit of the data bus • A uniformwiringdesign between the control units connected to a bus system. • The numberofnecessarydatalines is significantly lower. • The type, scope and directionof the data to be transmitted makes no difference as long as the bus is not overloaded. • Information is transmitted digitally. All information can be easily transmitted in a digital format and decoded by another control unit. • The digital transmissionmethod makes detection and correction of transmission errors possible.

  4. Principle of data transfer • First step

  5. Second step

  6. Third step

  7. Fourth step

  8. Data transmission process Data transmission using the example of engine speed detection: transmission -display - The following example describes the complete process for exchanging engine speed information from detection through to display in the rev counter. It explains the chronological sequence of the data transmission process and the interaction between the CAN modules and the control units.

  9. DATA TRANSFER What does the can data transfer? It transfer the data protocol between the control modules at short intervals.It is subdivided into seven areas. The data protocol: Comprises a long string of bits.The number of bits in the data protocol depends on the size of the data field.

  10. GATEWAY FUNCTION • gateways are infrastructure components with which complex network structures can be implemented. • access to CAN networks via other communication systems. In each case, the protocols of the connected bus systems are mapped to the other communication model.

  11. HIGH & LOW SPEED CAN • window, lighting and seat control only need low speeds . • while engine, cruise control and antilock brakes require high speeds. • Two or three CAN buses may be used in a vehicle; for example, a high-speed bus may be dedicated only for safety (air bags, seat belt tensioners, etc.).

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