发动机废气能量回收系统研究

Study on Exhaust Energy Recycling System of Engine

废气能量回收是提高汽车节能减排效果的有效手段之一。建立了发动机废气涡轮发电回收系统模型;系统采用旁通阀和可变截面涡轮技术来控制发动机排气背压和涡轮机转速。针对某企业的某款车用发动机,利用有关数学模型及数学分析法对涡轮机进行了选项设计,确定了涡轮机的基本参数,根据基本参数选定某国产H1A涡轮机;再根据涡轮机有关输出参数对发电机及步进电机进行了选项设计。建立了废气能量回收系统仿真模型,对整个系统进行了仿真分析。结果表明,混合动力汽车发动机废气能量回收可以实现废气能量的回收利用。通过两种典型工况的仿真分析,其最高回收功率可达（1.7~1.9）k W。

Exhaust energy recovery is one of the effective means to improve the effect of automobile energy conservation and emissions reduction. Exhaust turbo generator recovering systemmodel of enginewas studiedJn this recovery system by-pass valve andvariable geometry turbine （VGT） were used to control the exhaust backpressure of engine and turbine speed.It used a mathematical model and related mathematical analysis options for turbines designed to determine the basic parameters of the turbine for a certain vehicle engine for a company. According to the basic parameters, a domestic H1A turbine was selected; then the generator and related stepper motor design options were done according to the output parameters of the turbine. Exhaust gas energy recovery system simidation model was established, and the simulation analysis of the whole system had beencarried out.The results show that the hybrid electrical vehicle engine exhaust gas energy recovery system can realize the recycling of waste gas energy.Accarding to the simulation analysis of two typical working conditions, the maximum recycling power is up to （1.7-1.9）kW.