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要对发动机非稳定工况实施最优控制 ,就应对其在非稳定工况下的工作过程做深入的研究。求取燃烧放热率是进行燃烧过程优化研究的基本手段 ,但在迄今为止的各种燃烧分析仪中 ,给出的多为稳定工况分析结果。作者依据 492 Q汽油机加速过程的试验结果 ,修正了汽油机燃烧放热率计算的热力学模型 ,使之适用于非稳定工况。最后 ,通过实测示功图分析了 492 Q汽油机沿外特性加速过程的放热特性和指示效率
To carry out the optimal control of the engine unsteady conditions, it should be in-depth study of the working process under unstable conditions. Calculating the heat release rate is the basic method to optimize the combustion process. However, in the various combustion analyzers hitherto, most of the results are given for the analysis of steady state conditions. Based on the test results of 492Q gasoline engine acceleration process, the author revised the thermodynamic model of gasoline engine combustion heat release rate calculation, making it suitable for unstable conditions. Finally, the exothermic characteristics and indicated efficiency of the 492 Q gasoline engine along the acceleration process