Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1993-06-25
1994-11-29
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3704
Patent
active
053680022
ABSTRACT:
An evaporated fuel purge control apparatus includes a purge control valve arranged in a purge passage between a canister and an intake passage of an engine, the purge control valve being switched on and off in accordance with a control factor, the control factor indicating a duty ratio of an on-time of the purge control valve within a duty cycle to a total duty-cycle time, a detecting part for detecting an operating condition under which the engine is operating, and a flow rate control part for setting a control factor for the purge control valve in accordance with the operating condition detected by the detecting part, the control factor set by the flow rate control part allowing a flow rate of evaporated fuel fed from the canister into the intake passage through the purge control valve to be maintained at a constant level when the operating condition of the engine changes.
REFERENCES:
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patent: 4748959 (1988-06-01), Cook
patent: 4951637 (1990-08-01), Cook
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patent: 5263460 (1993-11-01), Baxter
Hoshino Shinichi
Hyodo Yoshihiko
Itou Takaaki
Kidokoro Toru
Okawa Koji
Miller Carl S.
Toyota Jidosha & Kabushiki Kaisha
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