汽车智能启停系统控制策略及节能减排分析

The Analysis on Control Strategy and Energy Conservation and Emission Reduction of Intelligent Vehicle Start-Stop System

传统汽车存在两点不足:减速制动时,反复的摩擦制动会损伤制动器,且动能无法回收;怠速时发动机空转耗能,尾气排放加剧。另外,考虑到蓄电池充放电慢,吸收制动能量有限,而超级电容可迅速充放电,故提出一种基于逻辑门限值的启停控制策略:先分析启停系统的工作原理、蓄电池与超级电容组成的复合电源的特点;然后确定启停系统及能量回馈的整体结构及其控制策略;最后在ADVISOR软件上建立具有复合电源的系统模型。仿真结果表明:该控制策略能有效避免发动机怠速空转耗能,降低尾气排放,实现制动能量回收,且复合电源比单一电源的制动回收率更高。

The traditional cars have the following deficiencies:when braking,repeated friction brake will damage the brake,and kinetic energy can not be recycled;when the engine work under the idle speed condition,the engine waste energy and exhaust emissions are increased. In addition,considering the slow charge and discharge of battery,the super capacitor has the ability of charging and discharging quickly. So this paper put forward a kind of control strategy of start-stop based on logic threshold:first analyze the working principle of the start-stop system and the characteristics of composite power and super capacitor;then put forward the configuration of start-stop system and the whole structure of energy feedback,and put forward the control strategy;finally,built the start-stop system model with the composite power supply on the ADVISOR software.The results show that the start-stop control strategy can avoid the fuel consumption effectively when the engine is in the idle speed condition,reduce exhaust emissions,what’s more,the composite power supply are more effective than the single power about the ability of braking energy recover.