Air-fuel ratio control system for automotive engines

Details Air-fuel ratio control system for automotive engines Air-fuel ratio control system for automotive engines

1989-06-02

1991-06-04

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123519, F02M 3302

Patent

active

050205030

ABSTRACT:
An automotive engine has a canister for purging fuel vapor to an intake passage of the engine through a purge valve. An O.sub.2 -sensor is provided for producing an output voltage relative to oxygen concentration of exhaust gases of the engine. A feedback control system responds to an output signal of the O.sub.2 -sensor for controlling the air-fuel ratio of mixture supplied to the engine with a correcting coefficient. Stopping of the purging of the fuel vapor at idling of the engine is detected and a purge cut-off signal is produced. In response to the purge cutt-off signal, the coefficient is increased to 1.0, so that the air-fuel ratio is reduced to enrich the mixture, thereby preventing the mixture from becoming lean at the stopping of the purging.

REFERENCES:
patent: 4275697 (1981-06-01), Stoltman
patent: 4467769 (1984-08-01), Matsumura
patent: 4630581 (1986-12-01), Shibata
patent: 4641623 (1987-02-01), Hamburg
patent: 4646702 (1987-03-01), Matsubara
patent: 4763634 (1988-08-01), Morozumi

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