Fuel-vapor treatment method and apparatus for internal combustio

Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system

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123357, F02M 3704

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active

056091427

ABSTRACT:
A fuel-vapor treatment method and apparatus for an internal combustion engine, wherein when the density of fuel vapor emitted directly from a fuel tank is higher than the density of fuel vapor emitted from a canister, provisions are made to prevent the density of the mixture of these vapors purged into an intake passage from varying substantially, thereby suppressing perturbations in air-fuel ratio. When purge execution time becomes long, the energization of a solenoid valve used to control the amount of purge gas from the canister is limited to keep the maximum/minimum amount of purge gas or the amount of change thereof within a prescribed range. This serves to suppress the variation in purge gas amount, and hence the variation in vapor density, that may occur during a transition from idling to driving (in the increasing direction of the purge gas amount) or during a transition from driving to idling (in the decreasing direction of the purge gas amount).

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patent: 5323751 (1984-06-01), Osanai et al.
patent: 5445133 (1995-08-01), Nemoto
patent: 5465703 (1995-11-01), Abe
patent: 5469832 (1995-11-01), Nemoto
patent: 5474049 (1995-12-01), Nagaishi
patent: 5476081 (1995-12-01), Okawa

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