CONTROL OPTIMIZATION OF TURBOCHARGED DIRECT INJECTION MILLER CYCLE HYBRID ENGINE

Hybrid internal combustion engines need to optimize fuel consumption while increasing engine power, to achieve higher overall fuel economy and total range while ensuring charging performance. This paper takes a turbocharged direct injection Miller cycle hybrid engine as the research object, utilizing GTPower to establish a one-dimensional simulation model. Through this model, the influence of the intake valve closing (IVC) advance angle on engine performance and combustion is studied. The results showed that in the high load region, the advance of IVC brought significant decrease in exhaust temperature, AI50 and ignition angle, which resulting in a significant increase in combustion speed, a decrease in ignition delay and combustion duration angle. In the end, with advanced IVC angle, the brake thermal efficiency increased 4.5 %. Meanwhile, the research outcome can be used to guide the calibration and shorten the development time.