The Car Can Bus Network Control System Design And Implementation

With the vehicle electronics development, more and more electronic devices areused in modern vehicles which have gradually entered into the computer-controlled era.The increasing electrical equipment in motor vehicles make the automobile electricalsystem to be a complex and large system, so that the problems of in-car wiring difficultbecome increasingly acute. If the traditional wiring technology was continously adopted,the body wiring would inevitably become longer and more complicated which reducesthe operating reliability and increases the fault maintenance difficulty. Therefore, so thenetwork structure based on the serial information transmission becomes an inevitablechoice.In this thesis, based on referencing to large amounts of data and in-depth analysingthe vehicle network, the CAN bus network protocol is adopted, which is low-cost andhigh-performance. This thesis introduces the technical specifications of the CAN busnetwork protocol and accomplishes the overall design of the vehicle CAN bus networkcontrol using the advantages of the CAN bus technology. DSP56F807is selected toestablish a DSP control system and the switch signals and speed signals processingcircuits are designed. The light control and DC motor control circuits are given. And,the anti-jamming measures are given. The hardware design of the CAN bus controlsystem is completed.This thesis adopts the general-purpose modular software design idea to designCAN bus general-purpose module, A/D conversion module, digital input and outputmodules, input capture module and pulse width modulation (PWM) module with thehelp of DSP56F807programming development environment CodeWarrior8.0and theintegrated development package Processor Expert (PE). The software design of theCAN bus control system is completed.In this thesis, the CAN bus test platform is developed using DSP56F807and thedevelopment package PE. And the CAN bus communication experiments, the bus lightand DC motor control tests and the application of CAN bus protocol are conducted. Theresults show that the system operation is stable and reliable under laboratory conditions.