Modeling Analysis on Improving Cylinder Balance in A Gasoline Engine Using Electromagnetic Valve Train
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For the multi-cylinder gasoline engine, the consistency among cylinders is an important index to affect the engine emission and the engine power. In this paper, an individual cylinder air-fuel ratio (A/F) control method for a fourcylinder camless engine with the electromagnetic valve train (EMVT) was proposed to reduce the imbalance of engine torque. An individual cylinder A/F estimation algorithm with a single universal exhaust gas oxygen (UEGO) sensor based on fading Kalman filtering was introduced. Four proportional-integral feedback controllers were built to regulate the individual A/F by adjusting the intake valve closing (IVC) timing of each cylinder independently based on the EMVT. The effectiveness of the proposed estimation and control approach was validated by co-simulation of GT-Power and Simulink. The results showed that the proposed estimation method could accurately estimate the individual cylinder A/F, and the maximum estimation error under steady state condition was less than 1 %. With the feedback control, both the individual A/F imbalance and the cylinderto- cylinder torque generation imbalance were decreased.
Key WordsIndividual A/F control Gasoline engine Electromagnetic valve train Torque balancing
bottom dead center
brake specific fuel consumption
electromagnetic valve train
friction mean effective pressure
intake valve closing
relative standard deviation
universal exhaust gas oxygen
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This work was supported by the National Natural Science Foundation of China [grant number 51306090]; and the Natural Science Foundation of Jiangsu Province, China [grant number BK20130762].
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