某前置前驱车油耗一致性的试验与仿真

Experiments and modeling on the fuel consumption consistency of a front-engine front-drive vehicle

为满足四阶段油耗限值和企业平均燃料消耗量(CAFC)指标,对于一款油耗(FC)一致性较差的发动机前置、前轮驱动(FF)车型,分析其油耗一致性问题。采用整车能量流方法,对怠速油耗和子系统互换,进行了仿真与测试,从而排除发动机、变速箱、排气系统等影响因素。通过断电机试验,将油耗差异来源聚焦在电气系统。测试发电机效率,排除发电机对电耗差异的影响。结果表明:电器功耗占比34%,蓄电池充电功耗占比66%。因此,电耗差异来源于电器和蓄电池,蓄电池的初始电量又是主要因素。

A fuel consumption consistency problem was analyzed for a front-engine front-drive(FF)vehicle with a poor fuel consumption(FC)consistency to meet the four-stage fuel consumption limit and corporate average fuel consumption(CAFC).A vehicle energy flow method was used to simulate and test an idle fuel consumption and a subsystem interchange to eliminate some influencing factors such as engine,gearbox and exhaust system.The source of fuel consumption differences was focused on the electrical system through disconnected motor tests.Generator efficiency was tested to eliminate the impact of generators on power consumption.The results show that electrical power consumption accounts for 34%,and battery charging power consumption accounts for 66%.Therefore,the difference in power consumption comes from electrical appliances and batteries,and the initial charge of battery is the major factor.