Currently, the article analyzes the CAN bus＇s rule of priority＇s arbitration bit by bit without destroy. It elicits the conclusion that if static priority based on the affirmatory system model is used, the lower pri...Currently, the article analyzes the CAN bus＇s rule of priority＇s arbitration bit by bit without destroy. It elicits the conclusion that if static priority based on the affirmatory system model is used, the lower priority＇s messages will be delayed considerably more, even some data will be lost when the bus＇s bandwidth is widely used. The scheduling cannot be modified neither during the system when static priority is used. The dynamic priority promoting method and the math model of SQSA and SQMA are presented; it analyzes the model＇s rate of taking in and sending out in large quantities, the largest delay, the problems and solutions when using SQMA. In the end, it is confirmed that the method of improving dynamic priority has good performances on the network rate of taking in and sending out in large quantities, the average delay, and the rate of network usage by emulational experiments.展开更多
针对混合动力电动汽车(hybrid electric vehicle,HEV)控制系统CAN总线在调度信号时的不确定性和低优先级信号易死锁等问题,设计了基于截止期公差递增区分策略的混合调度算法进行优先级分配,并应用于HEV控制系统中。最后利用Truetime和dS...针对混合动力电动汽车(hybrid electric vehicle,HEV)控制系统CAN总线在调度信号时的不确定性和低优先级信号易死锁等问题,设计了基于截止期公差递增区分策略的混合调度算法进行优先级分配,并应用于HEV控制系统中。最后利用Truetime和dSPACE硬件在环平台进行实例HEV的CAN测试和功能仿真分析,验证了该混合调度算法的有效性,从而为研究新能源汽车(包括纯电动汽车、插电式混合动力汽车)的CAN总线数据通信提供一种新方法。展开更多
针对三相并联逆变器系统同步控制中CAN(controller area network)总线通信方式存在实时性和准确性随总线负载上升而下降和同步相位调节算法存在谐波频率偏移、波形畸变大等问题,该文提出了一种基于CAN总线通信的基准时间同步方法和基于P...针对三相并联逆变器系统同步控制中CAN(controller area network)总线通信方式存在实时性和准确性随总线负载上升而下降和同步相位调节算法存在谐波频率偏移、波形畸变大等问题,该文提出了一种基于CAN总线通信的基准时间同步方法和基于PWM(pulse width modulation)载波周期的相位同步调整算法,采用动态主从同步控制模式,所有逆变器单元依次作为主控单元,按照时间触发和事件触发相结合的方式实时发出包含频率信息的广播同步信号,所有逆变模块据此确定基准时间并调整输出电压的频率和相位使得同相的逆变器输出电压同频率、同相位,而不同相的逆变器输出电压相位互差120°。仿真分析和试验结果表明,该方法使三相并联逆变器系统输出电压各相之间的相位误差和同相之间相位差均在1°之内,可以在无需增加功率器件耐压值和限流值的前提下提高供电系统供电容量。展开更多
基金supported by the National Natural Science Foundation of China (50421703)the National Key Laboratory of Electrical Engineering of Naval Engineering University
文摘Currently, the article analyzes the CAN bus＇s rule of priority＇s arbitration bit by bit without destroy. It elicits the conclusion that if static priority based on the affirmatory system model is used, the lower priority＇s messages will be delayed considerably more, even some data will be lost when the bus＇s bandwidth is widely used. The scheduling cannot be modified neither during the system when static priority is used. The dynamic priority promoting method and the math model of SQSA and SQMA are presented; it analyzes the model＇s rate of taking in and sending out in large quantities, the largest delay, the problems and solutions when using SQMA. In the end, it is confirmed that the method of improving dynamic priority has good performances on the network rate of taking in and sending out in large quantities, the average delay, and the rate of network usage by emulational experiments.
文摘针对混合动力电动汽车(hybrid electric vehicle,HEV)控制系统CAN总线在调度信号时的不确定性和低优先级信号易死锁等问题,设计了基于截止期公差递增区分策略的混合调度算法进行优先级分配,并应用于HEV控制系统中。最后利用Truetime和dSPACE硬件在环平台进行实例HEV的CAN测试和功能仿真分析,验证了该混合调度算法的有效性,从而为研究新能源汽车(包括纯电动汽车、插电式混合动力汽车)的CAN总线数据通信提供一种新方法。
文摘针对三相并联逆变器系统同步控制中CAN(controller area network)总线通信方式存在实时性和准确性随总线负载上升而下降和同步相位调节算法存在谐波频率偏移、波形畸变大等问题,该文提出了一种基于CAN总线通信的基准时间同步方法和基于PWM(pulse width modulation)载波周期的相位同步调整算法,采用动态主从同步控制模式,所有逆变器单元依次作为主控单元,按照时间触发和事件触发相结合的方式实时发出包含频率信息的广播同步信号,所有逆变模块据此确定基准时间并调整输出电压的频率和相位使得同相的逆变器输出电压同频率、同相位,而不同相的逆变器输出电压相位互差120°。仿真分析和试验结果表明,该方法使三相并联逆变器系统输出电压各相之间的相位误差和同相之间相位差均在1°之内,可以在无需增加功率器件耐压值和限流值的前提下提高供电系统供电容量。
