重庆大学学报：自然科学版2012，Vol.35Issue(5)：14-21,8.
汽油机连续可变进气凸轮轴相位策略的数值模拟
Numerical simulation on phasing strategy for a gasoline engine with continuously variable intake camshaft
摘要
Abstract
Intake gasoline engine. camshaft equipped with continuously adjustable cam phasing units is applied to a 486Q Phasing strategies are researched through engine cycle simulation to achieve superior engine performance. The simulation results show that at high load and low and moderate speed of the engine,phasing adjustment can lead to 6% to 8% increase in power performance because phasing advance contributes to suppressing intake backflow at IVC （intake valve closed）. Cam phases obtained from numerical optimization have good agreement with engine test. At moderate load, cycle simulations show that phasing advance can increase residual gas coefficient from 9 % to 20%, and reduce NO emission by80%,BSFC（brake specific fuel consumption） by 2O//oo at a demonstration operation. With regard to fuel economy and emissions,adjustment and optimization of intake phasing at moderate load are further verified by engine test. At low load,technical approaches to enhance combustion stability,reduce HC emission and improve cold start are investigated. The effectiveness of suppressing exhaust backflow into intake duct by phasing retard is testified by simulation. Phasing changes at the operating condition are optimally obtained by engine test for improvement of combustion stability.关键词
汽车发动机/可变气门正时/控制策略/循环模拟/废气再循环Key words
Key words, automobile engine/variable valve timing/control strategy/cycle simulation/EGR (exhaust gasrecirculation)分类
能源科技引用本文复制引用
张力,尚会超,袁志强,马为,付秋波,陈明飞..汽油机连续可变进气凸轮轴相位策略的数值模拟[J].重庆大学学报：自然科学版,2012,35(5):14-21,8.基金项目
重庆市科技攻关计划重点资助项目 （）
