A model of one-cylinder engine was set up by the use of the commercial software EXCITE Designer from AVL company. A series of experiments were done to gain the gas pressure in cylinder under different environment pressure.

• 首先建立了考虑气压影响的单缸发动机模型,然后通过实验测得发动机在不同环境气压下气缸内的燃气压力,将此压力作为载荷加载到单缸发动机模型上,利用AVL公司提供的商用软件EXCITEDesigner计算得出主轴承和连杆大端轴承的载荷、偏心率和摩擦功率损失。