起动初始条件对GDI汽油机反转直接起动模式实现的影响  

Effect of Initial Start Conditions on Realization of Reverse Direct-Start Mode for a GDI Engine

作　　者：孙文旭[1] 洪伟[1] 解方喜[1] 黄恩利 杨俊伟[3] 汤绪雯[3] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130025 [2]河北中兴汽车制造有限公司,保定071000 [3]奇瑞汽车股份有限公司,芜湖241009

出　　处：《内燃机工程》2016年第4期57-63,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51206059);国家"八六三"高技术研究发展计划项目(2012AA111702);中国博士后科学基金项目(2013M540250);吉林省青年科研基金项目(20140520128JH)

摘　　要：针对一台4G15缸内直喷汽油机试验研究了冷却水温、活塞初始位置、油轨内燃油压力等起动初始条件对反转直接起动模式实现的影响，并分析了在不同初始条件下膨胀缸和压缩缸控制参数的优化选取策略。研究结果表明：随着初始条件的变化，与之相匹配的优化控制参数也有所改变。燃油压力和冷却水温降低后，需采用较浓的混合气。冷却水温在70-80℃之间时有利于反转起动模式的实现，提高燃油压力同样也有利于反转起动模式的实现。为使反转直接起动模式成功实现，活塞初始位置需要控制在适当的范围内，当压缩缸活塞初始位置处于上止点后曲轴转角为-60°-70°之间时，在压缩缸和膨胀缸相继着火后可使发动机获得较大的正向转动速度，有利于提高起动响应性。Experimental study on the effects of starting initial conditions like cooling water temperature, original piston position and fuel pressure in rail on the realization of reverse direct-start mode without starter was conducted on a 4G15 GDI engine. And the optimized strategies of the expansion cylinder and compression cylinder＇s control parameters was analyzed at different initial conditions. Test results show that along with the change of initial conditions, the optimized control parameters should be changed accordindly. Reducing the fuel pressures and decreasing the cooling water temperature, need to use a richer mixture. The cooling water temperature between 70 ℃-80 ℃ is best suited to realize the reverse direct-start mode and raising fuel pressure in the rail also helps to realize the start mode. For realization of reverse direct-start mode, the initial position of compression cylinder＇s piston should be controlled within a proper range. When the initial position is between （-60°-70°） CA after TDC, the engine can obtain higher forward rotation speed after the compression cylinder and the expansion cylinder get fire, which will improve engine starting response.

关 键 词：内燃机 缸内直喷汽油机 直接起动模式 起动初始条件 控制参数 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]