US3554175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporative emission control system
Assignee: Old Carco LLC
•
Filing: 1969-12-08
•
Granted: 1971-01-12
•
Expires: 1989-12-08
Abstract
Abstract A system for controlling evaporative emissions from the fuel system of a motor vehicle wherein the fuel tank and carburetor bowl are vented to the crankcase of the engine so that the crankcase serves as an accumulator to collect fuel vapors from the fuel tank and fuel bowl while the engine is turned off; the crankcase is in turn vented to the engine intake so that the collected vapors are subsequently burned in the engine during subsequent operation of the engine. The venting of the carburetor bowl to the crankcase is selectively controlled by a valve.
Inventors
- 👤 Jorma O Sarto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:23
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/08; F02M25/06; F02M2025/0863; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
282 words
In a power system for a motor vehicle including an internal combustion engine having at least one combustion chamber and a crankcase, a fuel tank for storing a volatile fuel, and a charge delivery system including a carburetor having a throttle valve and a fuel bowl and an air intake conduit defined in part by said carburetor and communicating with the combustion chamber; an evaporative emission control system comprising: A. first conduit means extending between said fuel tank and said crankcase, whereby to allow said crankcase to function as an accumulator to collect vapor evaporating from said fuel tank; B. second conduit means extending between said fuel bowl and said crankcase; C. a control valve in said second conduit means; D. means operative in response to movement of said throttle valve to selectively open and close said control valve, whereby to allow said crankcase to function under selected throttle conditions as an accumulator to collect vapor evaporating from said fuel bowl; E. third conduit means extending between said crankcase and said air intake conduit at a location therein downstream of said throttle valve, whereby to allow the vapor accumulated in said crankcase to be supplied to said intake conduit for delivery to said combustion chamber; F. said third conduit means is closed during shutdown of said engine so that the evaporative emissions entering said crankcase during such shutdown are accumulated therein; G. said emission control system further includes an absorption type filter capable of absorbing evaporative emissions; and H. fourth conduit means are provided to route any evaporative emissions in excess of crankcase storage capacity to said filter, whereby the filter supplements the operation of said crankcase in recovering the evaporative emissions.
Claim 2
Dependent Claim
282 words
In a power system for a motor vehicle including an internal combustion engine having at least one combustion chamber and a crankcase, a fuel tank for storing a volatile fuel, and a charge delivery system including a carburetor having a throttle valve and a fuel bowl and an air intake conduit defined in part by said carburetor and communicating with the combustion chamber; an evaporative emission control system comprising: A. first conduit means extending between said fuel tank and said crankcase, whereby to allow said crankcase to function as an accumulator to collect vapor evaporating from said fuel tank; B. second conduit means extending between said fuel bowl and said crankcase; C. a control valve in said second conduit means; D. means operative in response to movement of said throttle valve to selectively open and close said control valve, whereby to allow said crankcase to function under selected throttle conditions as an accumulator to collect vapor evaporating from said fuel bowl; E. third conduit means extending between said crankcase and said air intake conduit at a location therein downstream of said throttle valve, whereby to allow the vapor accumulated in said crankcase to be supplied to said intake conduit for delivery to said combustion chamber; F. said third conduit means is closed during shutdown of said engine so that the evaporative emissions entering said crankcase during such shutdown are accumulated therein; G. said emission control system further includes an absorption type filter capable of absorbing evaporative emissions; and H. fourth conduit means are provided to route any evaporative emissions in excess of crankcase storage capacity to said filter, whereby the filter supplements the operation of said crankcase in recovering the evaporative emissions.
Claim 3
Dependent Claim
103 words
An evaporative emission control system according to claim 1 wherein: I. said fourth conduit means comprises the only source of fresh air for said crankcase so that fresh purging air enters said crankcase through said fourth conduit means as said accumulated vapors leave the crankcase through said third conduit means; and J. said filter is also capable of desorption of the evaporative emissions so that the fresh air passing through said fourth conduit means en route to said crankcase purges said filter and delivers the previously absorbed evaporative emissions to said crankcase and thence to said intake conduit for combustion in said engine.
Claim 4
Dependent Claim
48 words
An evaporative emission control system according to claim 2 wherein: K. said charge delivery system includes an air cleaner; L. said fourth conduit means comprises a conduit extending from said air cleaner to said crankcase; and M. said filter comprises a charcoal canister interposed in said fourth conduit.
Claim 5
Dependent Claim
209 words
An evaporative emission control system for a motor vehicle of the type having an internal combustion engine including a carburetor with a fuel bowl; said system comprising: A. a first conduit extending from said fuel bowl to the crankcase of said engine; B. a valve in said first conduit; C. means operative in response to operation of the throttle of said vehicle to selectively open and close said valve, whereby to selectively provide vapor communication between said fuel bowl and said crankcase; D. a second conduit having vapor communication at one end with the fuel tank of the vehicle and extending therefrom to said crankcase, whereby to provide vapor communication between said fuel bowl and said crankcase; E. a third conduit extending from said crankcase to the intake manifold of said engine, whereby to provide a path to deliver evaporative emissions from said crankcase to the combustion chambers of said engine; F. said first and second conduits connect to a common cap member which is removably positioned on said engine over an opening in said engine communicating with said crankcase; and G. a fourth conduit extending from the air cleaner of said engine to said cap member, whereby to provide a supply of clean purging air to said crankcase.
Claim 6
Dependent Claim
209 words
An evaporative emission control system for a motor vehicle of the type having an internal combustion engine including a carburetor with a fuel bowl; said system comprising: A. a first conduit extending from said fuel bowl to the crankcase of said engine; B. a valve in said first conduit; C. means operative in response to operation of the throttle of said vehicle to selectively open and close said valve, whereby to selectively provide vapor communication between said fuel bowl and said crankcase; D. a second conduit having vapor communication at one end with the fuel tank of the vehicle and extending therefrom to said crankcase, whereby to provide vapor communication between said fuel bowl and said crankcase; E. a third conduit extending from said crankcase to the intake manifold of said engine, whereby to provide a path to deliver evaporative emissions from said crankcase to the combustion chambers of said engine; F. said first and second conduits connect to a common cap member which is removably positioned on said engine over an opening in said engine communicating with said crankcase; and G. a fourth conduit extending from the air cleaner of said engine to said cap member, whereby to provide a supply of clean purging air to said crankcase.
Claim 7
Dependent Claim
40 words
An evaporative emission control system according to claim 4 and further including: H. an absorption type filter element interposed in said fourth conduit operative to absorb evaporative emissions from said fuel bowl and fuel tank in excess of crankcase capacity.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |