通常,对于汽车的动力性和燃料经济性水平,是在进行实车试验之后给予最后评价的。这样不但化费的时间长、成本高,而且在产品设计阶段对整车及各总成方案的确定、技术参数的选择等等,就带有一定程度的盲目性,使产品性能不能令人满意,从而造成人力、物力上的浪费。 In general, the final assessment of the car’s power and fuel economy is made after a real car test. This not only costs a long time, high cost, but also in the product design phase of the vehicle assembly and the determination of the program, the choice of technical parameters, etc., with a certain degree of blindness, the product performance is not satisfactory , Resulting in human, material and waste.