Design And Implementation Of A Car Light Control System Based On LIN Bus

With the rapid development and wide application of electronic technology on the automobile,especially bus and tiny controller after entering the car control field, have brought epoch-making change, the market competition and calling with customer demand, impulse the technical development of car bus rapidly.Large quantity application of the electronic unit on automobile, must cause increase that automobile body connect up and complicate , operation dependability reduce , trouble maintain degree of difficulty increase. Especially the introducing in a large amount of electronic control module, in order to improve the utilization ratio of the signal, require large quantities of data information to share in different electronic unit, In automobile comprehensive control system a large number of control signals need exchanging in real time too, the traditional line bunch has already been far from meeting this kind of demand . Based on the recent increasing development for car bus technology,it is very important to make use of car bus technology to reduce car track tie inside and decline cost ,thus the control of a car is humanized and the intelligentize More.Aimed at above problem, this text introduce primarily LIN(Local Interconnect Network) bus application.It is a low speed serial bus protacal,Lin sub-bus is primarily intended for modules like window,door,switch panel and light etc.The technology of LIN bus is introduced in the thesis. Researched car light control based on LIN bus.theories analyze of LIN bus is investigated, according to LIN protocal ,designed and developed intelligence master and slave node. completed hardware component selection and designed of master circuit , slave node,and software analyze and procedure realize. Have introduced basic knowledge and protocal of LIN at first; Secondly, simple introduction chip and performance used, integrated little controller AT89C51,P89PLC921. independent LIN transceiver TJA1020 mainly; Finally , introduced the designs of its operation principle , main design of module and procedure The design norm of the light system includes:The communication of LIN bus between node is according to the norm of LIN1.2 completely.The LIN physical layer has been derived from the ISO 9141.The LIN interface is based on the standard UART/SCI.LIN network consist of single master node and multiple slave node concept. It provides convenient application programming interface .Hardware component selection is based on industrialization and paied attention to performance price ratio. It means that the performance meets the control demand and the price cost as lower as possible. Hence, we adopt Philips TJA1020 ,ATMEL Micro-controller AT89C51 and Philips PLC921.In the design of hardware system,we respectively designed master node and slave node,in order to extend the function for slave node,we reserved circuit node .In the design of software function, we paid attention to synchronization and reliability.For instance the function of control left and right flash lamp is assigned to the master node.As a result slave node is reliability and synchronization.The system software adopted structured program design technique, we respectively compiled program module for master-to-slaver communication from protocal layer,API interface and application layer.In addition to applied for LIN bus technology in car trade,the LIN can alse be used as the partial bus of industry system,used for communications switch ,relay and small scaled electrical machine.This paper brings forward a cheap solution of car light control based on LIN BUS in domestic for the first time. realization a digitalized and intelligent device in a car . I wish this paper could bring forward some thoughts for LINBUS industrialization in china, which is beneficial to automation level in domestic car industry.The research and application of the light's control is better struction for LIN bus control of car body system.