【摘要】 开发了采用Flexray总线通信的低成本缸压采集系统:基于MPC5644A单片机设计了缸压实时采集系统的硬件模块;针对缸压数据大流量的特点,对Flexray总线进行了优化设计,并通过软件实现了双缓存机制,保证缸压数据能够实时传输;通过CANoe把Flexray总线上的缸压数据进行实时储存,并利用Matlab对缸压数据进行离线分析。在1台4缸中型高压共轨柴油机上的试验表明:该采集系统能够实时采集缸压数据,能够通过Flexray总线把所有缸压数据传输到上位机并储存到ASC文件中,利用储存的数据能够离线进行相关的燃烧分析。更多还原

【Abstract】 The in-cylinder pressure real-time acquisition system with low cost was developed with Flexray bus and the hardware module of the system was designed with MPC5644 Asingle chip microcomputer.For the large data flow of in-cylinder pressure,the Flexray bus was optimized and the dual-buffer was realized by the software to guarantee the real-time transmission of in-cylinder pressure data.The in-cylinder data in Flexray bus was saved in real time by CANoe and its offline analysis was carried out with Matlab tool.On a 4-cylinder high-pressure common rail diesel engine,the acquisition system was verified.The results show that the system can collect the in-cylinder pressure data,transmit them to upper computer and save them in ASC file.With the saved data,the offline combustion analysis can be carried out.更多还原