Patent US3913545A successfully refreshed from Google Patents.
US3913545A
Expired / Lapsed
US
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Evaporative emission system
Assignee: Ford Motor Co
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Filing: 1973-04-04
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Granted: 1975-10-21
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Expires: 1993-04-04
Abstract
Abstract A fuel vapor recovery system for the adsorption, storage and eventual recycling of vapors to an engine. The system has a vapor-storage canister containing activated carbon for adsorbing fuel vapors from various parts of the engine fuel system. The system selectively purges the fuel vapors for introduction to the engine intake manifold. The purging is controlled in response to engine loading and engine speed for improved engine operation.
Inventors
- 👤 Lawrence H Haase
- 👤 David R Liimatta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:08
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/08; F02M25/0836
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
In an internal combustion engine having a fuel system, an intake manifold and a carburetor with a throttle to provide a gaseous mixture engine flow, an apparatus for controlling the recovery of fuel vapors in said system, comprising: a. means for adsorbing and storing said fuel vapors, b. a passage for purging said stored fuel vapors and for conveying said vapors to said intake manifold, c. a first control means responsive to vacuum upstream from said throttle for maintaining said passage in either a fully opened or a fully closed condition, said passage having internal walls defining an aperture between said first control means and said means for absorbing vapors and through which flow must pass in said passage, and d. a second control means responsive to vacuum in said intake manifold for regulating the aperture of said passage whereby said storing means is desorbed at a rate inversely proportional to engine flow.
Claim 2
Dependent Claim
153 words
In an internal combustion engine having a fuel system, an intake manifold and a carburetor with a throttle to provide a gaseous mixture engine flow, an apparatus for controlling the recovery of fuel vapors in said system, comprising: a. means for adsorbing and storing said fuel vapors, b. a passage for purging said stored fuel vapors and for conveying said vapors to said intake manifold, c. a first control means responsive to vacuum upstream from said throttle for maintaining said passage in either a fully opened or a fully closed condition, said passage having internal walls defining an aperture between said first control means and said means for absorbing vapors and through which flow must pass in said passage, and d. a second control means responsive to vacuum in said intake manifold for regulating the aperture of said passage whereby said storing means is desorbed at a rate inversely proportional to engine flow.
Claim 3
Dependent Claim
36 words
An apparatus as in claim 1, in which said second control means comprises a valve biased to a minimum aperture condition and progressively opened in opposition to said bias by an increase in intake manifold vacuum.
Claim 4
Dependent Claim
19 words
An apparatus as in claim 2, in which said second means is actuated in response to PCV port vacuum.
Claim 5
Dependent Claim
94 words
The apparatus as in claim 1, which further comprises, in combination with said apparatus, an engine exhaust system having a catalytic converter and means calibrated to vary in response to predetermined air/fuel mixtures, said second control means being effective to regulate desorption of fuel vapors from said storing means in such amounts as to maintain said calibrated means in a condition to provide an air/fuel mixture at least above 14/1 whereby the amount of carbon monoxide in said exhaust gas system is maintained in a predetermined range compatible for operation of said catalytic converter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |