针对惯性导航系统的特性,设计了新的控制区域网(Control Area Network,CAN)总线应用层协议。为把检测控制数据和导航解算数据分离,系统被分为两条CAN总线。对于检测控制总线,通过对信息的分类,存储数据和传输数据格式的统一,以及通讯的...针对惯性导航系统的特性,设计了新的控制区域网(Control Area Network,CAN)总线应用层协议。为把检测控制数据和导航解算数据分离,系统被分为两条CAN总线。对于检测控制总线,通过对信息的分类,存储数据和传输数据格式的统一,以及通讯的三次握手,保证检测控制总线的可靠性和程序的可移植性。对于导航解算总线,通过对数据的分时传输和对每次传输的计数,保证通讯的可靠性和实时性。实验表明:该协议具有可靠性高、网络负载小和通讯实时性好的特点。展开更多
在基于 CAN 总线的嵌入式系统中,采用 ARM7TDMI 内核的 16/32 位 RISC MCU 是独立的地址和数据总线,而 CAN 总线控制器是利用地址锁存信号 ALE 来复用数据地址总线。为了实现MCU 与 CAN 总线的透明连接,提出利用可重配置技术,在一块 FP...在基于 CAN 总线的嵌入式系统中,采用 ARM7TDMI 内核的 16/32 位 RISC MCU 是独立的地址和数据总线,而 CAN 总线控制器是利用地址锁存信号 ALE 来复用数据地址总线。为了实现MCU 与 CAN 总线的透明连接,提出利用可重配置技术,在一块 FPGA 上实现 MCU 与 CAN 控制器之间总线的转换。软件仿真和实际应用表明,可重配置模块能够很好地满足时序要求,真正实现了透明的无缝传输。展开更多
Safety-critical applications such as the independently driving systems of electric vehicle (EV) require a high degree of reliability. The controller area network (CAN) is used extensively in the control sectors. A...Safety-critical applications such as the independently driving systems of electric vehicle (EV) require a high degree of reliability. The controller area network (CAN) is used extensively in the control sectors. A new real-time and reliable scheduling algorithm based on time-triggered scheduler with a focus on the CAN-based distributed control systems for independently driving EV is exploited. A distributed control network model for a dual-wheel independendy driving EV is established. The timing and reliabili- ty analysis in the worst case with the algorithm is used to evaluate the predictability and dependability and the simulation based on the algorithm with CANoe software is designed. The results indicate the algorithm is more predicable and dependable.展开更多
文摘针对惯性导航系统的特性,设计了新的控制区域网(Control Area Network,CAN)总线应用层协议。为把检测控制数据和导航解算数据分离,系统被分为两条CAN总线。对于检测控制总线,通过对信息的分类,存储数据和传输数据格式的统一,以及通讯的三次握手,保证检测控制总线的可靠性和程序的可移植性。对于导航解算总线,通过对数据的分时传输和对每次传输的计数,保证通讯的可靠性和实时性。实验表明:该协议具有可靠性高、网络负载小和通讯实时性好的特点。
文摘在基于 CAN 总线的嵌入式系统中,采用 ARM7TDMI 内核的 16/32 位 RISC MCU 是独立的地址和数据总线,而 CAN 总线控制器是利用地址锁存信号 ALE 来复用数据地址总线。为了实现MCU 与 CAN 总线的透明连接,提出利用可重配置技术,在一块 FPGA 上实现 MCU 与 CAN 控制器之间总线的转换。软件仿真和实际应用表明,可重配置模块能够很好地满足时序要求,真正实现了透明的无缝传输。
基金Supported by the National High Technology Research and Development Programme of China (No. (2008AA11 A146 ), China Postdoctoral Science Foundation (20090450298).
文摘Safety-critical applications such as the independently driving systems of electric vehicle (EV) require a high degree of reliability. The controller area network (CAN) is used extensively in the control sectors. A new real-time and reliable scheduling algorithm based on time-triggered scheduler with a focus on the CAN-based distributed control systems for independently driving EV is exploited. A distributed control network model for a dual-wheel independendy driving EV is established. The timing and reliabili- ty analysis in the worst case with the algorithm is used to evaluate the predictability and dependability and the simulation based on the algorithm with CANoe software is designed. The results indicate the algorithm is more predicable and dependable.