To presume accurately the fuel injecting condition of a fuel injection valve to be removed, when a reduction of the number of fuel pressure sensors is to be made.
In case a first and second fuel injection valves 10 (#2 and #3) are mounted with a first and second fuel pressure sensors 20 (#2 and #3) while a third fuel injection valve 10 (#1) is not mounted with a fuel pressure sensor, injecting cylinder waveforms and non-injecting cylinder waveform are acquired by the first and second fuel pressure sensors when the first fuel injection valve makes fuel injection, and the propagation time is calculated on the basis of the phase difference between the acquired injecting cylinder waveforms and non-injecting cylinder waveform. When the third fuel injection valve makes fuel injection, the non-injecting cylinder waveform for presumption is acquired by the first fuel pressure sensor 22 (#2), and the fuel injecting condition of the third fuel injection valve is presumed on the basis of the calculated propagation time and the non-injecting cylinder waveform for presumption.
| JP2010223184A | 2010-10-07 | |||
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Yasunari Kurita
Kyoko Hino
Satoru Ando
Hiroshi Matsuda