Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1997-01-17
1997-12-09
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123436, 123357, F02M 4100
Patent
active
056949049
ABSTRACT:
An evaporative control system for a multicylinder internal combustion engine makes the driving period of a purge control valve for asynchronous to an engine cycle when controlling purged fuel, to keep an air-fuel ratio in the engine stabilized, improve exhaust purifying performance, and prevent lean misfires.
The engine has a canister for storing evaporated fuel from a fuel tank, a purge pipe for connecting the canister to an intake duct of the engine, and a purge control valve disposed in the purge pipe. A driving period changing unit sequentially changes the driving period of the purge control valve from one to another, or changes it so that the start of the driving period may not continuously agree with a crank angle of the engine. A valve controlling unit opens and closes the purge control valve according to the driving period set by the driving period changing unit. A duty factor setting unit sets a minimum valve open time for the purge control valve. A timer unit measures an interval of purge control. A restricting unit restricts the change of the driving period of the purge control valve according to a duty factor.
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patent: 5016591 (1991-05-01), Nanyoshi
patent: 5465703 (1995-11-01), Abe
patent: 5469832 (1995-11-01), Nemoto
patent: 5609142 (1997-03-01), Osanai
Miller Carl S.
Toyota Jidosha & Kabushiki Kaisha
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