基于MPC555的高压共轨柴油机控制策略及匹配研究

Research on Control Strategy for High Pressure Common Rail Diesel Engine Based on MPC555

基于自主开发的MPC555电控单元,利用软件编程设计了共轨柴油机控制策略。综合考虑高压共轨柴油机的各种运行工况,采用模块化设计方法,设计了共轨柴油机油量控制、轨压控制、工况转移管理、4阶段起动控制、故障处理等控制策略。应用工况分析法,根据工况点的使用频度和重要性,采用变步长与等步长配合,设计和优化控制MAP,有效提高了匹配效率和软件的执行效率。进行了控制策略发动机台架试验验证和排放匹配优化,匹配后的发动机排放达到欧-Ⅲ水平。

A fuel injection control strategy for high pressure common rail diesel engine was designed based on the electric control unit （ECU） with the high performance microcontroller MPC555. The control software was designed by modularization method according to various operation conditions of diesel engine. The software modules included the fuel quantity control module, rail pressure control module, management module for point of engine operation（POP）, four stage start procedure control module, fault handling module and so on. By analyzing the frequency and importance of the POP, the control MAP was designed by using variable step and equal step. Finally, the experiments were conducted on test bench to verify the feasi- bility and reliability of the control strategies and to optimize the emission performance of the engine. Experimental results show that the expected control effect is achieved and the engine can reach the EURO-Ⅲ emission standard.