摘要
为了提高发动机在实际使用工况的燃油经济性,提出了基于NEDC循环的设计方法,即考虑一款搭载增压直喷发动机的车辆在实际运行工况中车速和时间关系,通过GT-DRIVE软件建立车辆在循环工况下对发动机扭矩、转速的需求模型;进而对整车NEDC工况下的发动机特性区域的目标机油压力进行设计;然后使用GT-SUITE软件根据目标油压计算二级可变机油泵驱动功。相对于传统的定排量机油泵,二级可变机油泵设计可以降低液压驱动功,从而降低发动机总成摩擦功。仿真分析表明:使用二级可变机油泵可以使发动机整体油耗降低1.39%。
In order to improve the fuel consumption economy of engine in actual operation condition, a design method based on NEDC cycle is proposed, which considers the speed and time relationship of a vehicle equipped with supercharged direct injection engine in actual operating conditions. GT-DRIVE software is used to build the model of the demand of vehicle for engine torque and speed under cyclic conditions; and then the target engine oil pressure in the engine characteristic area under the vehicle NEDC condition is designed; and next,the GT-SUITE software is used to calculate the secondary variable pump oil drive power according to the target oil pressure. Compared with the traditional variable displacement oil pump, two variable oil pump design can reduce the hydraulic drive work, thereby reducing the engine assembly friction work. Simulation analysis shows that by using two variable oil pump, the overall engine fuel consumption can be reduced by 1.39%.
出处
《内燃机与配件》
2017年第4期12-15,共4页
Internal Combustion Engine & Parts
