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目前,人们常采用压缩线平分法或多变指数法,根据反拖示功图确定柴油机的动态上止点。经模拟计算表明,这些热力学方法仅能确定反拖柴油机p—φ示功图的最大压力p_(max)出现位置φ_m。在直喷式柴油机中,φ_m总导前于动态上止点,其导前角⊿φ_m与传热损失和漏气损失有关。本文介绍一种确定直喷式柴油机动态上止点的方法,其误差不大于0.2°CA(CA—为曲轴转角)。
At present, people often use the compression line bisecting method or variable index method, according to the anti-dragging chart to determine the dynamic top dead center of the diesel engine. The simulation results show that these thermodynamic methods can only determine the maximum pressure p_ (max) appearance position φ_m of the p-φ dynamometer of the anti-drag diesel engine. In direct injection diesel engine, φ_m total lead before the dynamic top dead center, its leading angle ⊿ φ_m heat transfer loss and loss of air leakage. This article presents a method to determine the dynamic top dead center of a direct injection diesel engine with an error of not more than 0.2 ° CA (CA - crank angle).