Method and apparatus for detecting trouble in exhaust-gas recirc

Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture

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731173, F02M 2507

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active

055774849

ABSTRACT:
In the EGR system having an EGR control valve in an EGR passage, an orifice is provided on the exhaust side of the EGR control valve to define a negative pressure chamber between the EGR control valve and the orifice, and the pressure in the negative pressure chamber can be detected by a pressure-detector. When the operation state of the internal combustion engine is in a first operation zone wherein the amount of EGR is larger than a predetermined value, it is determined that clogging has occurred in the intake side EGR passage if the pressure value detected by the pressure-detector is smaller than a preset negative pressure value; while, it is determined that clogging has occurred in the exhaust side EGR passage if the pressure value detected by the pressure-detector is larger than the predetermined negative pressure value. An ON/OFF type pressure switch may be used as the pressure-detection means 17. As a result, it is possible to accurately detect the clogging position in the EGR passage without an increase in cost.

REFERENCES:
patent: 4390001 (1983-06-01), Fujimoto
patent: 4428355 (1984-01-01), Yokooku
patent: 4723528 (1988-02-01), Tamura
patent: 5190017 (1993-03-01), Cullen et al.
patent: 5341300 (1994-08-01), Fujimoto
patent: 5368005 (1994-11-01), Kako
patent: 5508926 (1996-04-01), Wade

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