Closed loop air-fuel ratio control system

Details Closed loop air-fuel ratio control system Closed loop air-fuel ratio control system

1980-07-07

1981-06-30

Miles, Tim R.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

261 67, 261DIG74, 251 65, F02M 720

Patent

active

042756979

ABSTRACT:
A command signal drives a carburetor metering valve to provide the carburetor fuel flow which will establish a desired air-fuel ratio; simultaneously, the command signal drives a control unit which purges fuel vapor from a fuel vapor storage region. The control unit minimizes purge flow when either maximum fuel flow or minimum fuel flow is commanded and maximizes purge flow when an intermediate fuel flow is commanded; accordingly, fuel vapor is purged from the vapor storage region only when the purge flow cannot unduly enrich or unduly lean the mixture.

REFERENCES:
patent: 3680318 (1972-08-01), Nakajima et al.
patent: 3683597 (1972-08-01), Beveridge et al.
patent: 4013054 (1977-03-01), Balsley et al.
patent: 4127097 (1978-11-01), Takimoto
patent: 4175526 (1979-11-01), Phelan
Research Disclosure 16601, FIG. 1, Feb. 1978.
"An Adsorption-Regeneration Approach to the Problem of Evaporative Control", S.A.E. Report 670127, 1-9-67, 123-519.

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