高温高负荷下Miller发动机扭矩提升的控制策略

Control strategy for torque enhancement in Miller engines under high-temperature and high-load conditions

为了解决Miller循环混动发动机在高温高负荷下爆震倾向明显增加而导致扭矩损失严重的问题,该研究通过台架试验,对进排气相位、喷油比例和喷油相位等关键控制参数进行了优化,并根据高温高负荷下发动机的工作特性,在发动机控制逻辑中引入温度修正。结果表明:进排气相位优化等措施成功抑制了爆震;优化后的发动机在1600 r/min高温全负荷工况下扭矩提升了18.5%;并且实现了对进排气相位、喷油参数和点火角的高温补偿,以及不同温度下控制参数的解耦,显著改善了高温高负荷下的动力性能衰减。

In order to solve the problem that the knocking tendency of Miller cycle hybrid engine increases significantly under high temperature and high load,resulting in serious torque loss,the key control parameters such as intake and exhaust phase,injection ratio and injection phase were optimized through bench tests,and the temperature correction was introduced into the engine control logic according to the operating characteristics of the engine under high temperature and high load.The results show that the detonation can be successfully suppressed by adopting some measures such as intake and exhaust phase optimization.The optimized engine torque is increased by 18.5%under 1600 r/min high temperature full load condition;The high temperature compensation of intake and exhaust phase,fuel injection parameters and ignition angle,and the decoupling of control parameters under different temperatures are realized,which significantly improves the dynamic performance attenuation under high temperature and high load.