高压共轨柴油机的转矩柔性控制策略研究

Study on Flexible Torque Control Strategy for High Pressure Common Rail Diesel Engines

通过对高压共轨柴油机转矩控制的需求分析,设计了一种前导通道和主控通道相结合的转矩柔性控制架构,给出了前导通道和主控通道相关控制模块的具体控制算法。利用ETAS公司的ASCET软件建立了该控制策略的转矩控制模型,经自动代码生成和编译下载到自制的电子控制单元(ECU)电路板中进行台架试验。试验结果表明:在发动机不同工况下,由于前导通道中微分控制的作用,油门踏板变化时喷油量受控于转矩前导通道,反之则受控于转矩主控通道,并使得发动机转速按照预期目标进行快速稳定地变化。

According to the analysis of the requirement of torque control for high pressure common rail diesel engines, the architecture was designed of flexible torque control with leading set-point and main set-point. And specific control algorithms were presented for the leading set-point and main set-point in relevant control models. Torque control models of such control strategy were successfully built by using the ASCET software of ETAS Corporation. These torque control models were calibrated by on-engine experiment after automatic coding generation, and compiled and downloaded to a self-made ECU circuit board. The experiment results show that under different engine working conditions, because of the differential control of the leading set-point, the fuel injection quantity is controlled by the torque＇s leading set-point when the accelerator pedal moves and by the torque＇s main set-point when the accelerator pedal is still. So this makes engine speed change quickly and steadily according to a set target.