Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1993-12-21
1995-05-02
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123519, 123520, F02M 3302
Patent
active
054110076
ABSTRACT:
An air-fuel ratio control apparatus of an internal combustion engine in which a canister to adsorb and hold evaporated fuel is provided in a supply passage which communicates an intake passage of the internal combustion engine and a fuel tank, and an atmosphere opening/closing valve is provided so as to open the canister to the atmosphere. A purge valve is provided in the supply passage between the intake passage and the canister, and a pressure sensor communicates with the supply passage between the canister and the fuel tank. A control that closes the atmosphere opening/closing valve is closed when leakage is judged and reduces a pressure in the fuel tank to a predetermined negative pressure value, and thereafter closes the purge valve so that a leakage state of an evaporating system is discriminated. A fuel supply section is provided to supply the fuel to the internal combustion engine, and the control includes a control section for controlling in a manner such that when leakage judging conditions are satisfied, a preset promising correction amount is added to a fuel supply amount from the fuel supply section synchronously with the closing operation of the atmosphere opening/closing valve to thereby reduce fluctuation of the air-fuel ratio when the leakage is judged.
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Nelli Raymond A.
Suzuki Motor Corporation
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