Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1996-04-04
1997-09-09
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
731173, F02M 2507
Patent
active
056645481
ABSTRACT:
A trouble-detection apparatus for an EGR system provided with an EGR control valve in an EGR passage, capable of correctly detecting a position in the EGR passage at which the clogging has occurred. The trouble-detection apparatus is applied to the system having the EGR control valve controlled by a negative pressure in the EGR passage wherein a lift amount of the EGR control valve is controlled by a lift sensor in a feedback manner in accordance with the operating state of the engine. According to the trouble-detection apparatus, the amplitude of the lift amount detected by the lift sensor is obtained and the pulses in the exhaust-gas flow are calculated from the detected amplitude. When the amplitude of the pulses in the exhaust-gas flow does not reach a threshold value preset in accordance with the operating state of the internal combustion engine, it is determined that clogging as occurred in the EGR passage. In such a case, it is also possible to determine whether or not the clogging has occurred in the EGR passage by dividing the lift amount detected by the lift sensor into two subsystems, extracting solely a pulse component therefrom, calculating an amplitude of the extracted pulse component, and comparing the calculated amplitude with a threshold value.
REFERENCES:
patent: 3794006 (1974-02-01), Woodward
patent: 4195531 (1980-04-01), Okamura
patent: 4428355 (1984-01-01), Yokooku
patent: 4448177 (1984-05-01), Hasegawa et al.
patent: 4541398 (1985-09-01), Kishi
patent: 5257610 (1993-11-01), Ohuchi
patent: 5337725 (1994-08-01), Narita
patent: 5508926 (1996-04-01), Wade
patent: 5577484 (1996-11-01), Izutani et al.
Izutani Takahide
Morita Koji
Onaka Hidemi
Toyota Jidosha & Kabushiki Kaisha
Wolfe Willis R.
LandOfFree
Apparatus for detecting trouble in exhaust-gas recirculation sys does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for detecting trouble in exhaust-gas recirculation sys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for detecting trouble in exhaust-gas recirculation sys will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-63803