Fuel supply control system for an engine

Details Fuel supply control system for an engine Fuel supply control system for an engine

1995-10-24

1996-11-12

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123698, 123520, F02D 4114, F02M 2508

Patent

active

055729800

ABSTRACT:
A fuel supply control system for an engine comprises a canister for temporarily storing fuel vapor, a purge passage extending between the canister and a intake passage downstream of a throttle valve, and a purge control valve arrange in the purge passage for controlling the amount of a purge gas, that is, air containing fuel vapor, flowing through the purge passage. The purge control valve is controlled by a duty ratio, which is defined as a ratio of a period during which the purge control valve is opened to a duty cycle time. Namely, the purge control valve is driven to make an opening ratio of the purge control valve equal to the duty ratio. The duty cycle for each cycle is calculated before the corresponding cycle starts, in accordance with an engine operating condition at that time. During each cycle, a corrected duty cycle is calculated in accordance with the engine operating condition at that time. Then, the purge control valve is driven to make opening ratio of the purge control valve equal to this corrected duty ratio.

REFERENCES:
patent: 5216997 (1993-06-01), Osanai et al.

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