Abstract: A method of improving MVEM simulation accuracy was proposed based on test parameters of the engine under real operating conditions. Firstly, the performance of a naturally aspirated engine in the mass production states was measured on the five-motor bench. The engine water temperature, engine speed, engine cylinder pressure, intake port pressure and temperature, intake manifold pressure and temperature, fuel volume flow, power generation flywheel end torque, exhaust manifold pressure and temperature, exhaust manifold excess air coefficient, exhaust pressure and temperature after three-way catalysis were obtained from the tests. Secondly, the model was created and calibrated based on the vehicle environment boundary by Amesim/MATLAB software combined simulation. The results show that the maximum errors between the predicted results of the calibrated MVEM and the actual test ones may be controlled within 8%.

Key words: five-motor bench, calibration, mean value engine model(MVEM), combined simulation

摘要： 基于实车状态下发动机的测试运行参数，提出了一种改进发动机均值模型仿真精度的方法。首先基于五电机台架对实车搭载环境下的一款自然吸气发动机进行了性能测试，分别获得发动机水温、发动机转速、发动机缸内压力、进气道压力和温度、进气歧管压力和温度、燃油体积流量、发动机飞轮端扭矩、排气歧管压力和温度、排气歧管过量空气系数、三元催化后排气压力和温度等参数；然后运用Amesim/MATLAB软件联合仿真对发动机进行了基于实车搭载环境边界下的数值建模和模型标定。研究结果表明，标定后的发动机均值模型预测结果与实际测试结果最大差值可以控制在8%以内。

关键词: 五电机台架, 标定, 发动机均值模型, 联合仿真