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Heat release rate waveform calculation apparatus and heat release rate waveform calculation method for internal combustion engine
Heat release rate waveform calculation apparatus and heat release rate waveform calculation method for internal combustion engine
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机译:内燃机的放热率波形计算装置和放热率波形计算方法
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摘要
A combustion speed, for example, is estimated or evaluated, with a required accuracy, more simply than the conventional art, while reducing man-hours to produce a heat generation rate waveform of an internal combustion engine. An increase rate of a heat generation rate relative to a change in a crank angle in a heat generation rate increasing period (e.g., a first-half combustion period a ) in which the heat generation rate increases after ignition of an air-fuel mixture is defined as a heat generation rate gradient b / a that is one of characteristic values of the heat generation rate waveform. The heat generation rate gradient is estimated based on a fuel density (e.g., fuel density Á fuel@dQpeak at heat generation rate maximum time) at a predetermined time set in advance in the heat generation rate increasing period so as to produce the heat generation rate waveform using the estimated heat generation rate gradient.
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