Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1995-03-13
1996-10-01
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Fuel injection system
123436, 123571, 731173, F02P 514, G01L 326, G06F 1900
Patent
active
055603360
ABSTRACT:
In an apparatus and method for estimating a stability factor of combustions in a vehicular internal combustion engine, a engine revolution synchronized filter processing is carried out for a signal derived in synchronization with the engine revolutions and, thereafter, a time synchronized filter processing is carried out to extract the frequency component correlated to the engine combustion stability factor. Noise components synchronized with the engine revolutions, based on a revolution speed sensor working accuracy error, and based on tire (road) wheel revolution (rotation) first-order vibration frequency are eliminated. In addition, a resonance frequency component in a vehicular drive train is extracted as a frequency component correlated to the combustion stability factor.
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Deguchi Yoshitaka
Matsumura Toshio
Okura Kazuma
Takahashi Nobutaka
Nissan Motor Co,. Ltd.
Wolfe Willis R.
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