高压共轨柴油机喷油器零油量自学习标定策略

提出一种自学习零油量标定方法.引入发动机段加速度的概念,当发动机满足倒拖等工况条件和在标定轨压下,按一定的喷油脉宽控制喷油器进行测试喷射,通过发动机段加速度的变化判断是否有燃油燃烧,调整喷油脉宽的增减进行再次测试喷射,直到相邻两次喷射引起的段加速度的变化位于已定义阈值的两侧,最终获取在该轨压下该喷油器的零油量标定值.喷油实验台与整车实验结果对比表明,这种喷油器零油量自学习标定方法无需增加额外设备,标定精度高,实时性强.

Zero Fuel Auto-learning Calibration of Injector in High Pressure Common Rail Diesel Engine

A zero fuel auto-learning calibration strategy was adopted and the concept of engine segment acceleration was introduced. When the necessary condition for calibration and the rail pressure defined by the calibration were required in overrun phase, zero fuel calibration triggered small injections to a cylinder, and attempted to detect a change in the engine crankshaft segment acceleration. Then, the parameters for the injections were changed in predefine step value for the energizing time until a predefined segment acceleration change was detected between two neighborhood injections. Finally, the energizing time was saved as zero quantity calibration value of the injector in the rail pressure defined. The injection bench and the experimental vehicle test results showed that zero fuel auto-learning calibration strategy does not need to add any components, and it has higher calibration veracity and real-time characteristic.