009 车载局域网LAN技术

名人名言
活到老，学到老。 Never too late to learn.
－－premier Zhou-en Lai －－周恩来
LIN的构成与连接 （ Structure and connection of LIN ）
名人名言
活到老，学到老。 Never too late to learn.
－－premier Zhou-en Lai －－周恩来
CAN signal format(5)
All messages are sent to all units and each unit makes the decision whether the message should be acted upon or not. This means that further systems can be added to the bus at any time and can make use of data on the bus without affecting any of the other systems.
车载局域网LAN的构成 （Structure of LAN ）
控制器局域网CAN的构成 （Structure of CAN ）
控制器局域网CAN的连接 （Connection of CAN ）
带CAN控制器的DS80C390高速CPU （High CPU with CAN controller ）
CAN signal format(2)
The name portion of the signal identifies the message destination and also its priority. As the transmitter puts a message on the bus it also reads the name back from the bus. If the name is not the same as the one it sent then another transmitter must be operating which has a higher priority. If this is the case it will stop transmission of its own message. This is very important with motor vehicle data transmission.
1993 Bosch CAN BUS
Bosch CAN-BUS
二、 发动机ECU的组成
Nissan ECU
二、 发动机ECU的组成
ຫໍສະໝຸດ Baidu
HITACHI ECU
四、汽车采用网络技术的目的 （purpose to use LAN）
目 的： • 一是减少汽车线束； • 二是实现快速通讯。
Purpose： • reduce wiring harness • to communicate at high speed
PASSAT -Shanghai Volkswagen
EFI ABS EBD SRS ActivematicECT CAN-BUS
2004款 波罗POLO
EFI SRS ECT ABS+EBD CAN-BUS
2004款 长安福特嘉年华Fiesta
EFI ABS+EBD 2SRS CAN-BUS
CAN signal format(4)
The fact that each station in effect monitors its own output, interrupts disturbed transmissions, and acknowledges correct transmissions means that faulty stations can be recognised and uncoupled (electronically) from the bus. This will prevent other transmissions being disturbed incorrectly.
CAN signal format(6)
In some cases interference protection is equired. Bus lines, which consist of copper wires act, as transmitting and receiving antennae in a vehicle. Suitable protective circuits can be used at lower frequencies and the bus can therefore be designed in the form of an unscreened two-wire line. These measures can be used only to a limited extent and screening is recommended. The use of optical fibres would completely solve the radiated interference problem. However, the coupling of transmitters and receivers as well as connections and junctions, have up until now either not been reliable enough, or been too expensive. Many companies are looking at this problem and it is likely to be solved in the near future.
50年来汽车线束增加情况
五、汽车车载局域网分类 （classification of LAN）
LAN分类：classification • 内部网络： Internal LAN • 外部网络： External LAN
典型网络： CAN：Controller Area Network（ CAN协议） LIN：Local Interconnect Network（LIN协议） VAN：Vehicle Area Network（VAN协议） MOST: Media Oriented System Transport （MOST协议）
CAN signal format(3)
Errors in a message are recognised by a cyclic redundancy check. This is done by assembling all the numbers in a message into a complex algorithm and this number is also sent. The receiver uses the same algorithm and checks that the two numbers tally. If an error is recognised the message on the bus is deleted. This is recognised by the transmitter which then sends the message again. This technique, when combined with additional tests, makes it impossible for faulty messages to be transmitted without being discovered.
三、车载局域网的应用
(application of LAN) Foreign car: 奔 驰 Benz 宝 马 BMW 美 洲 豹 Catamount 劳斯莱斯 Rolls-Royce Chinese car: 帕 萨 特B5 PASSAT B5 波 罗 POLO 宝 来 BORA 奥 迪 A6 Audi A6 广州本田 Guangzhou HONDA
• Network： Network is a complete circuit or a part of the circuit to transmit electric signal which is composed of many electronic components in the electrical system.
控制器局域网CAN 总线的连接 （Connection of CAN Bus）
CAN signal format
循环冗余码校验CRC:Cyclic Redundancy Check
CAN signal format(1)
The CAN message signal consists of a sequence of binary digits (bits). The existence of a voltage (or a light in fibre optics) indicates the value' 1' while no voltage indicates '0'. The actual message can vary between 44 and 108 bits in length. This is made up of a start bit, name, control bits, the data itself, a cyclic redundancy check (CRC) for error detection, a confirmation signal and finally a number of stop bits (Figure 3.21).
二、车载局域网定义 (definition of LAN)
• 定义：分布在汽车上的电器与电子设备在
物理上互相连接，并按照网络协议相互进行 通讯，以共享硬件、软件和信息等资源为目 的电器与电子控制系统。 • Definition：it is a kind of electrical and electronic control system to share the hardware and software and information according to the communication protocol .
第四章 车载局域网LAN技术
（Local Area Network）
一、网络的定义(definition of network) 二、车载局域网定义(definition of LAN)
一、网络的定义 (definition of network)
• 网络：在电气系统中，由若干元件组成 的用来使电信号按一定要求传输的电路 或这种电路中的某一部分电路。
汽车内部 LAN( Internal LAN )
汽车外部 LAN(External LAN )
LAN分类(classification of LAN )
动力传动系统的应用
（application in power and transmission system）
安全系统的应用 （ application in safety system）