Many automotive performance tests are conducted on chassis dynamometer, while tyre rolling resistance is an important factor to affect measuring accuracy.
许多汽车性能试验均在底盘测功机上进行，而轮胎滚动阻力是影响测试精度的重要原因。
2
PLC was used to control the transducer, change current of the dynamometer, so that it can change simulated load resistance.
采用PLC控制变频器来改变电力测功机励磁电流的大小，来达到改变模拟加载阻力的要求。
3
A coasting performance test is simulated on a chassis dynamometer, the transmission resistance, rolling resistance of wheels and their speed factors are measured.