关键词: 发动机在环；驾驶风格；中国重型商用车瞬态循环；油耗排放

Abstract: With fuel economy and emission regulations for vehicles have become increasingly stringent year by year, it is difficult to evaluate whether the engine bench development reach the limit requirements of vehicle fuel economy and emission in the early stage of development. At the same time, the emission and fuel consumption are affected by the different driving styles on the vehicle. The impact of the drivability cannot be separated for evaluation. In this context, based on the C-WTVC cycle, a bench simulation test was carried out through the engine-in-the-loop system. From the simulation follow-up results of vehicle speed and engine speed, the working conditions of the whole vehicle can be accurately reproduced. The fuel consumption results of the EIL system and the vehicle are compared with the fuel consumption deviation of 1.63%, and the deviation of the NOx exhaust cycle results is 0.91%. The accuracy results prove that the EIL-in-the-loop test method can be used to carry out the simulation verification of the whole vehicle. Based on the test results, the correction of the accelerator pedal for two driving styles, dynamic and economical (the torque output dynamic correction corresponding to 0-50% accelerator pedal is 6%-8% higher than the economic correction torque), was tested on the C-WTVC cycle. The effect of the results relative to the original data, dynamic correction, cycle-weighted fuel consumption increased by 0.34%, acceleration average increased by 0.48%, NOx original exhaust results increased by 1.65%, economic correction, cycle-weighted fuel consumption decreased by 1.2%, acceleration average reduced by 0.24%, the result of NOx original exhaust cycle is reduced by 5.2%. So in the development process, it is necessary to consider the coverage of different driving style modes on the regulatory limit.

Key words: Engine-in-the-loop; Different drivability; C-WTVC; Fuel economy and emissions