Abstract
The difference in fuel economy and emissions among vehicles meeting different emission regulations (ERs) was tested using a chassis dynamometer. The vehicle which meets the 1978ER, and ones that meet the 2005ER were examined. The results under the certification test conditions showed emission trends similar to a previous study for several vehicles which satisfied the 1978ER or the 2000ER. Several driving cycles were used in the test focusing on the ratio of the idling condition. In spite of the fact that the vehicles meet different ERs, the improvement in the fuel economy was from 25% or more at the average speed of around 9km/h to around 2% at 29km/h. As for the emissions, CO and HC increased but did not exceed the ER value during the low average speed driving cycle while NOx decreased. Based on the test, we proposed that if you use a vehicle which meets the 2005ER, you can do "no idling" action for the sake of conserving the global and local environments. The vehicle equipped with an automatic "no idling" action is desired to become widespread, because it had a better fuel economy and lower emissions than the others. Even if the vehicles meet the same ER, there are differences among the emission performances, and there is a case that the emission by the vehicle with the "no idling" operation is less than that with idling. In order to improve the real-world environment, it is important that such information is open and easily accessible by consumers.
