采用Flexray总线通信的柴油机缸压采集系统

In-cylinder Pressure Acquisition System of Diesel Engine Based on Flexray Bus

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。

The in-cylinder pressure real-time acquisition system with low cost was developed with Flexray bus and the hard-ware module of the system was designed with MPC5644A single 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 transmis-sion 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 .