在CAN(Controller Area Network)总线网络控制系统(Networked Control Systems,NCS)中,信息的传输时延大大降低了系统的控制性能,使系统的稳定范围变窄,甚至可能导致系统工作的不稳定.通过对CAN总线网络控制系统的研究建立了系统的状态方程,采用Lyapunov分析法得出了CAN总线网络控制系统工作的稳定域,阐明了信息传输时延对系统工作稳定性的影响.计算机仿真结果表明:减小CAN总线网络的前向时延τca在网络总时延τ中所占的比重,可以有效提高CAN总线网络控制系统工作的稳定性.
FlexRay bus has become the standard of similar products and it will lead the direction of the development of auto- motive electronics control system for a long time. This paper proposes a design of automobile engine control system based on FlexRay bus. In order to improve the network rate, reliability and flexibility, it adopts high-performance MC9S12XF512 microcontroller of Freescale and FlexRay bus driver TJA1080 of NXP company, and it gives the overall circuit design and software design process of automobile engine control system. The design has the characteristics of simple hardware circuit, high reliability and good real-time performance. It offers a certain reference value for the development of FlexRay bus node of engine control system.
In order to solve the complex wiring and low reliability of conventional light control system,an automobile contactless switch light system is designed combined with Hall element and controller area network （CAN） bus technology.The processing system of electromagnetic compatibility controlled by CAN bus is improved to reduce the electromagnetic interference from the controller and other sources of interference.With Freescale＇s high-performance single-chip MC9S08DZ60 and CAN transceiver TJA1050,the overall circuit design and software design are presented.The test results show that the designed light control system is feasible.
