Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1993-05-18
1994-10-11
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
F02M 3302
Patent
active
053537700
ABSTRACT:
An apparatus for controlling a flow of evaporated fuel from a canister being fed into an intake passage of an engine through a plurality of control valves arranged in parallel in a purge passage between the canister and the intake passage. The plurality of control valves includes at least a first valve being switched on and off by setting a control factor indicating a duty ratio of an on-time within a duty cycle to a total duty-cycle time for the first valve, and a second valve being switched on and off by setting a control factor indicating an on-state or off-state of the second valve for a total duty-cycle time. The apparatus includes a first control part for setting a first control factor for the first valve so that the first valve is switched on at a rate indicated by the first control factor, and a second control part for setting a second control factor for the second valve so that the second valve is switched on and off at a timing different from a timing at which the first valve is switched on and off.
REFERENCES:
patent: 5060621 (1991-10-01), Cook et al.
patent: 5103794 (1992-04-01), Shiraishi
patent: 5237979 (1993-08-01), Hyodo et al.
Hyodo Yoshihiko
Itoh Takaaki
Kidokoro Toru
Osanai Akinori
Cross E. Rollins
Moulis Thomas N.
Toyota Jidosha & Kabushiki Kaisha
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