| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cylinder pressure waveform estimation method and estimation device for an internal combustion engine for estimating a cylinder pressure wave based on a signal from other detection means without using a cylinder pressure detection means (cylinder pressure sensor) to accurately estimate the cylinder pressure without raising the cost. <P>SOLUTION: The cylinder pressure waveform estimation method includes: a reference pressure waveform calculation means 37 for calculating the reference cylinder pressure waveform at non-combustion of the internal combustion engine without using the cylinder pressure sensor; and a combustion difference pressure waveform calculation means 39 for calculating a combustion difference pressure waveform by connecting waveforms calculated by a combustion difference maximum value calculation means 41 for calculating the combustion difference pressure maximum value, an ascending waveform calculation means 43 for calculating the waveform of an ascending part using a time-lag function, and a descending waveform calculation means 45 for calculating the waveform of a descending part from the combustion difference pressure maximum value based on a calorific value from the amount of fuel consumption, and includes a cylinder pressure waveform calculation means 47 for adding respective waveforms from the reference pressure waveform calculation means 37 and the combustion difference pressure waveform calculation means 39 to calculate the cylinder pressure waveform. <P>COPYRIGHT: (C)2012,JPO&INPIT |
