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为了正确确定平均指示压力,最重要的是找出气缸容积与相应曲轴转角两者之间的正确关系。在两台不同发动机上研究了上止点值误差对平均指示压力值的影响。研究指出,上止点值误差与平均指示压力误差的关系呈线性。平均指示压力的误差取决于影响气缸压力曲线形状的各种参数。研究表明,上止点值误差每差1度曲轴转角,则对应的平均指示压力误差为2.5～7.5%。
In order to properly determine the average indicated pressure, it is of paramount importance to find the correct relationship between the cylinder volume and the corresponding crank angle. The effect of the top dead center error on the mean indicated pressure was investigated on two different engines. The study shows that the relationship between the top dead center error and the mean indicated pressure error is linear. The average indicated pressure error depends on various parameters that affect the shape of the cylinder pressure curve. The research shows that the error of average indicated pressure is 2.5 ~ 7.5% when the error of top dead center is 1 crank angle per 1 degree difference.