Control strategy for torque enhancement in Miller engines under high-temperature and high-load conditions
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 1 600 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.
automobile engineeringhybrid engineMiller cyclehigh temperature and high loadknocktorquecontrol strategy
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