汽车发动机首先是用在台架试验时所确定的主要参数来进行评价的。但是,由于各国标准所规定的发动机试验方法(试验范围、确定主要参数时发动机所带附件情况和对标准大气条件的换算式等方面)互相都不一致,因此同一台发动机得到的最大功率和最大扭矩值也不一样。例如DAF柴油机的特性,根据美国SAE标准和西德DIN The car engine is first evaluated using the main parameters determined during the bench test. However, due to the engine test method (test range, the attachment of the engine when determining the main parameters and the conversion of the standard atmospheric conditions, etc.) prescribed by national standards are inconsistent with each other, the maximum power and the maximum torque The value is not the same. For example, the characteristics of DAF diesel engine, according to the United States SAE standard and West Germany DIN