MODULE 10.pptx automotive actuators BODY Systems

After studying this module, you should be able to:
Understand what vehicle communication is all about.
Diagnose a fault relating to communication.
Understand the principle of multiplexing.
Know the different types of communication protocols found on vehicles.
Vehicle electrical and electronic systems have increased over the years; this has reduced the amount of mechanical systems powering a vehicle, and this makes vehicle technology more complex.
The various electrical and electronic systems need to have a means of communicating with each other just as the central nervous system does in a human being.
This has gone a long way to reduce an average vehicle’s overall weight by reducing the number of sensors and wirings; through a method that allows one sensor’s signal/s to be shared among different control units.
Vehicle network and communication techniques help to achieve better information sharing among vehicle systems.
Multiplexing is a means of transferring multiple digital or analog signals or information over a single communication link at the same time to a receiver.
The receiver collects the complex information and demultiplexes (breaks down/analyses) it into separate data.
Automotive control units or computers, which are connected in a network, are usually capable of being senders and receivers on the network.
Information sharing on such network is done serially or sequentially; where one controller receives and sends after which the next controller does the same, one after the other.
This sequence happens at an unimaginable speed and time.
Communication faults are usually grouped as the “U” code in the OBDII fault codes’ report (e.g. “U1000”).
These codes signify a loss of communication between control units.
Typically, when a vehicle system has a fault that prevents it from sending out data from its sensors to the network for other control units to use, the other control units will give out a loss in communication fault code.
Communication protocols are rules that govern how data is transferred between electronic devices.
On an automobile, there are several computer protocols that can be used. Examples of these include:
CAN (CONTROLLER AREA NETWORK).
ISO9141.
K-Line and L-Line.
J1850 bus+ and J1850 bus-.

Out of all these above listed protocols, the CAN is the most efficient.
CAN
This system was first developed by Robert Bosch automotive company in 1983 in Germany. It allows controller and devices on a vehicle to communicate with each other without having a host controller or computer.

The system works with a similar structure to multiplexing but with faster speed and a better level of fault detection.
Airbags are safety devices that act as supplements to the vehicle’s restraint system. The vehicle’s restraint system consists of those devices that restrain the movements of an occupant of a vehicle in the course of a crash, or collision. Such devices include: seat belts, seat belt tensioners, etc.
The airbag system, which is a

1. MODULE 10 NETWORK AND COMMUNICATION

2. objectives After studying this module, you should be able to: Understand what vehicle communication is all about. Diagnose a fault relating to communication. Understand the principle of multiplexing. Know the different types of communication protocols found on vehicles.

3. Unit 1 introduction to network and communication Vehicle electrical and electronic systems have increased over the years; this has reduced the amount of mechanical systems powering a vehicle, and this makes vehicle technology more complex. The various electrical and electronic systems need to have a means of communicating with each other just as the central nervous system does in a human being. This has gone a long way to reduce an average vehicle’s overall weight by reducing the number of sensors and wirings; through a method that allows one sensor’s signal/s to be shared among different control units. Vehicle network and communication techniques help to achieve better information sharing among vehicle systems.

4. Revision questions 1.What is the advantage of vehicle communication and network on a vehicle?

5. Unit 2 multiplexing Multiplexing is a means of transferring multiple digital or analog signals or information over a single communication link at the same time to a receiver. The receiver collects the complex information and demultiplexes (breaks down/analyses) it into separate data. Automotive control units or computers, which are connected in a network, are usually capable of being senders and receivers on the network. Information sharing on such network is done serially or sequentially; where one controller receives and sends after which the next controller does the same, one after the other. This sequence happens at an unimaginable speed and time.

6. Revision question What is multiplexing? How does multiplexing stand as an added advantage to the network system of a vehicle?

7. Unit 3 communication protocols Communication protocols are rules that govern how data is transferred between electronic devices. On an automobile, there are several computer protocols that can be used. Examples of these include : CAN (CONTROLLER AREA NETWORK). ISO9141 . K-Line and L-Line. J1850 bus+ and J1850 bus-. Out of all these above listed protocols, the CAN is the most efficient. CAN This system was first developed by Robert Bosch automotive company in 1983 in Germany. It allows controller and devices on a vehicle to communicate with each other without having a host controller or computer. The system works with a similar structure to multiplexing but with faster speed and a better level of fault detection.

8. Revision questions Explain the operation of the CAN. List 4 communication protocols found on vehicles. What is a communication protocol?

9. Unit 4 communication faults Communication faults are usually grouped as the “U” code in the OBDII fault codes’ report (e.g. “U1000”). These codes signify a loss of communication between control units. Typically, when a vehicle system has a fault that prevents it from sending out data from its sensors to the network for other control units to use, the other control units will give out a loss in communication fault code.

10. Revision questions Under what code are communication faults grouped? When will a communication fault arise on a vehicle?