Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1995-03-02
1996-02-06
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
731173, F02M 2507
Patent
active
054889383
ABSTRACT:
A fault detecting apparatus for an exhaust gas recirculation control system of an internal combustion engine includes a throttle valve provided in an intake pipe of the engine, an exhaust gas recirculation pipe for introducing an exhaust gas of the engine to the intake pipe downstream of the throttle valve, an exhaust gas recirculation valve for regulating a recirculation flow rate of the exhaust gas, sensors for detecting operation state inclusive of an intake pressure, an exhaust gas recirculation valve control unit for controlling the exhaust gas recirculation valve in accordance with operation state information, a fault decision enabling condition detecting means for detecting satisfaction of the condition enabling the decision about occurrence of fault in the recirculation valve control unit on the basis of the operation state information, a unit for forcibly opening and/or closing the exhaust gas recirculation valve when the fault decision enabling condition is satisfied, a fault decision means for comparing a value derived from the intake pressures detected upon enforcive opening/closing of the exhaust gas recirculation control valve with a fault decision reference value to decide whether any fault occurs in the recirculation valve control unit, and a compensation means for compensating for influence of a parameter which affects the intake pressures detected upon enforcive opening/closing of the recirculation valve. The range within which the fault decision is enabled can be widened and/or reliability of the fault decision can be improved.
REFERENCES:
patent: 4715348 (1987-12-01), Kobayashi et al.
patent: 4762109 (1988-08-01), Jeenicke
patent: 5137004 (1992-08-01), Takahata et al.
patent: 5150695 (1992-09-01), Kondo
patent: 5152273 (1992-10-01), Ohuchi
patent: 5337725 (1994-08-01), Narita
patent: 5368005 (1994-11-01), Kako
Mitsubishi Denki & Kabushiki Kaisha
Wolfe Willis R.
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