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Verification of Equivalent Indicated Mean Effective Pressure Measurement Method

Article of Honda R&D Technical Review Vol.22 No.2


Indicated mean effective pressure (IMEP) is generally used as a parameter directly expressing the status of combustion in an internal combustion engine. Issues of data stability, cost, and lifespan, among others, have made the use of pressure transducers in vehicle control applications challenging. The use of a method in which changes in engine vibration and bolt tightening force originating in the pressure diagram are measured and used to monitor equivalent IMEP, which has a strong correlation with IMEP, has potential for the future.
The research discussed in this paper studied a method in which signals originating in the pressure diagram were measured using a piezoelectric ignition plug washer-type force sensor and the results were used in the calculation of equivalent IMEP. When measurements were conducted in an actual engine, a correlation coefficient of 0.799 was obtained between IMEP, as determined from the pressure diagram, and equivalent IMEP, as determined using the force sensor. Alteration of the charge amplifier settings and the setting of a computation gate increased the correlation between equivalent IMEP and IMEP, raising the correlation coefficient to 0.990.


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Author (organization or company)

Keiichi NAGASHIMA(Automobile R&D Center)、Keiji MIURA(Automobile R&D Center)、Masahiko MATSUMOTO(Automobile R&D Center)、Naoki HANADA(Automobile R&D Center)、Yoshito TSUKAMOTO(Automobile R&D Center)、Kazuo TSUCHIYA(Meiji University)

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