US4527532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel-vapor emission control system for an automotive engine
Assignee: Subaru Corp
•
Filing: 1984-05-17
•
Granted: 1985-07-09
•
Expires: 2004-05-17
Abstract
Abstract A fuel-vapor emission control system has a canister having a vacuum operated purge control valve, communicated with a float chamber of a carburetor and a fuel tank for purging fuel-vapor. A vacuum chamber of the vacuum operated purge control valve is communicated with a port provided in the carburetor so as to apply manifold vacuum to the vacuum chamber at partial-throttle operation. Parallel purge lines are provided for communicating the canister with an intake manifold of the engine. A solenoid operated valve is provided in one of the purge lines for controlling the purging of the fuel-vapor. The solenoid operated valve is opened for the purging by a signal from a vehicle or engine speed sensor under such conditions that the engine does not stall.
Inventors
- 👤 Yoshiaki Kasai
- 👤 Yasuo Hiraoka
- 👤 Masaharu Yuasa
- 👤 Masataka Harada
- 👤 Masao Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:39
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/08; F02M2025/0845
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
153 words
A fuel-vapor emission control system for an automotive engine mounted on a vehicle, the engine having an intake manifold communicating with a carburetor having a float chamber, and a fuel tank, comprising: a canister having a vacuum-operated purge control valve, and said canister being communicated with said float chamber and said fuel tank for purging fuel-vapor; a passage communicating a port in said carburetor with a vacuum chamber of said vacuum-operated purge control valve so as to apply manifold vacuum to said vacuum chamber at partial-throttle operation; purge passage means for communicating said canister with said intake manifold; said purge passage means comprises parallel purge lines meeting upstream and downstream with a common line being fed to said intake manifold, valve means provided in only one of said purge lines for controlling the purging of the fuel-vapor; and means for opening said valve means under such conditions that the engine does not stall.
Claim 2
Dependent Claim
153 words
A fuel-vapor emission control system for an automotive engine mounted on a vehicle, the engine having an intake manifold communicating with a carburetor having a float chamber, and a fuel tank, comprising: a canister having a vacuum-operated purge control valve, and said canister being communicated with said float chamber and said fuel tank for purging fuel-vapor; a passage communicating a port in said carburetor with a vacuum chamber of said vacuum-operated purge control valve so as to apply manifold vacuum to said vacuum chamber at partial-throttle operation; purge passage means for communicating said canister with said intake manifold; said purge passage means comprises parallel purge lines meeting upstream and downstream with a common line being fed to said intake manifold, valve means provided in only one of said purge lines for controlling the purging of the fuel-vapor; and means for opening said valve means under such conditions that the engine does not stall.
Claim 3
Dependent Claim
17 words
The fuel-vapor emission control system according to claim 1 wherein: said valve means is a solenoid-operated valve.
Claim 4
Dependent Claim
33 words
The fuel-vapor emission control system according to claim 2 wherein: said means for opening said valve means is a vehicle speed sensor for producing a signal when vehicle speed exceeds a predetermined value.
Claim 5
Dependent Claim
19 words
The fuel-vapor emission control system according to claim 1, wherein: each of said purge lines has an orifice-type restrictor.
Claim 6
Dependent Claim
30 words
The fuel-vapor emission control system according to claim 1, further comprising: a thermo valve provided in said passage adapted for high idling speed of the engine in a cold condition.
Claim 7
Dependent Claim
23 words
The fuel-vapor emission control system according to claim 1, wherein: said purge passage means communicates with said canister via said purge control valve.
Claim 8
Dependent Claim
154 words
In a fuel-vapor emission control system for an automotive engine mounted on a vehicle, having an intake manifold, a carburetor, a float chamber, a fuel tank, a canister communicated with said float chamber and said fuel tank for purging fuel-vapor, a vacuum-operated purge control valve having a vacuum chamber, a passage communicating a port in said carburetor with the vacuum chamber so as to apply manifold vacuum to said vacuum chamber at partial-throttle operation, purge passage means for communicating said canister with said intake manifold, the improvement wherein: said purge passage means comprising parallel purge lines which meet upstream and downstream with a common line being fed to the intake manifold, a solenoid-operated valve means provided in one of the purge lines, a vehicle speed sensor for producing a signal for opening the solenoid-operated valve means when the vehicle speed exceeds a predetermined value, so as to increase the amount of the purged fuel-vapor.
Claim 9
Dependent Claim
154 words
In a fuel-vapor emission control system for an automotive engine mounted on a vehicle, having an intake manifold, a carburetor, a float chamber, a fuel tank, a canister communicated with said float chamber and said fuel tank for purging fuel-vapor, a vacuum-operated purge control valve having a vacuum chamber, a passage communicating a port in said carburetor with the vacuum chamber so as to apply manifold vacuum to said vacuum chamber at partial-throttle operation, purge passage means for communicating said canister with said intake manifold, the improvement wherein: said purge passage means comprising parallel purge lines which meet upstream and downstream with a common line being fed to the intake manifold, a solenoid-operated valve means provided in one of the purge lines, a vehicle speed sensor for producing a signal for opening the solenoid-operated valve means when the vehicle speed exceeds a predetermined value, so as to increase the amount of the purged fuel-vapor.
Claim 10
Dependent Claim
19 words
The fuel-vapor emission control system according to claim 7, wherein: each of said purge lines has an orifice-type restrictor.
Claim 11
Dependent Claim
30 words
The fuel-vapor emission control system according to claim 7, further comprising: a thermo valve provided in said passage adapted for high idling speed of the engine in a cold condition.
Claim 12
Dependent Claim
23 words
The fuel-vapor emission control system according to claim 7, wherein: said purge passage means communicates with said canister via said purge control valve.
Claim 13
Dependent Claim
150 words
In a fuel-vapor emission control system for an automotive engine mounted on a vehicle, having an intake manifold, a carburetor, a float chamber, a fuel tank, a canister communicated with said float chamber and said fuel tank for purging fuel-vapor, a vacuum-operated purge control valve having a vacuum chamber, a passage communicating a port in said carburetor with the vacuum chamber so as to apply manifold vacuum to said vacuum chamber at partial-throttle operation, purge passage means for communicating said canister with said intake manifold, the improvement wherein: said purge passage means comprising parallel purge lines which meet upstream and downstream with a common line being fed to the intake manifold, a valve means provided in one of the purge lines, a speed sensor for producing a signal for opening the valve means when the speed exceeds a predetermined value, so as to increase the amount of the purged fuel-vapor.
Claim 14
Dependent Claim
150 words
In a fuel-vapor emission control system for an automotive engine mounted on a vehicle, having an intake manifold, a carburetor, a float chamber, a fuel tank, a canister communicated with said float chamber and said fuel tank for purging fuel-vapor, a vacuum-operated purge control valve having a vacuum chamber, a passage communicating a port in said carburetor with the vacuum chamber so as to apply manifold vacuum to said vacuum chamber at partial-throttle operation, purge passage means for communicating said canister with said intake manifold, the improvement wherein: said purge passage means comprising parallel purge lines which meet upstream and downstream with a common line being fed to the intake manifold, a valve means provided in one of the purge lines, a speed sensor for producing a signal for opening the valve means when the speed exceeds a predetermined value, so as to increase the amount of the purged fuel-vapor.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |