US4253437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel control means for internal combustion engines
Assignee: Mazda Motor Corp
•
Filing: 1979-01-25
•
Granted: 1981-03-03
•
Expires: 1999-01-25
Abstract
Abstract Engine fuel control system includes a slow fuel passage for providing a supply of fuel mostly under a light load engine operation. A solenoid type shut-off valve is provided in the slow fuel passage so that the fuel supply is cut-off during deceleration. The valve is opened when the engine speed is decreased to a certain value to recover the fuel supply. The engine speed under which the fuel supply is recovered is lower when the vehicle brake is actuated than that when the brake is not actuated.
Inventors
- 👤 Tsutomu Haramoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:49
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/02; F02M3/04; F02M3/045; Y; Y10; Y10S; Y10S261/00; Y10S261/19
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
182 words
Fuel control means for vehicle engines which comprises slow fuel passage means for providing supply of fuel for slow engine operation, valve means provided in said slow fuel passage means and having an open and closed position, means for sensing deceleration of the engine and actuating the valve means to close the slow fuel passage means when the engine deceleration is sensed, characterized by fuel supply recovery means for detecting whether an engine operating condition is below a first predetermined value, whether the engine operating condition is below a second, lower predetermined value which is closer to engine idling condition than the first predetermined value and whether vehicle brake means is actuated and maintaining the valve means in the closed position when the vehicle brake means is actuated as long as the engine operating condition is above the second predetermined value and moving the valve means to the open position when the engine is decelerated either below the second predetermined value independent of brake means actuation or between the first and second predetermined values when the vehicle brake means is not actuated.
Claim 2
Dependent Claim
182 words
Fuel control means for vehicle engines which comprises slow fuel passage means for providing supply of fuel for slow engine operation, valve means provided in said slow fuel passage means and having an open and closed position, means for sensing deceleration of the engine and actuating the valve means to close the slow fuel passage means when the engine deceleration is sensed, characterized by fuel supply recovery means for detecting whether an engine operating condition is below a first predetermined value, whether the engine operating condition is below a second, lower predetermined value which is closer to engine idling condition than the first predetermined value and whether vehicle brake means is actuated and maintaining the valve means in the closed position when the vehicle brake means is actuated as long as the engine operating condition is above the second predetermined value and moving the valve means to the open position when the engine is decelerated either below the second predetermined value independent of brake means actuation or between the first and second predetermined values when the vehicle brake means is not actuated.
Claim 3
Dependent Claim
35 words
Fuel control means in accordance with claim 1 in which said fuel supply recovery means includes means for sensing engine speed to detect that the engine speed is below the first and second predetermined values.
Claim 4
Dependent Claim
121 words
Fuel control means in accordance with claim 1 in which said recovery means includes first fuel supply recovery means which includes means for sensing that the engine operating condition is below the first predetermined value and actuating valve means to the open position when the engine operating condition is below the first predetermined value, second fuel supply recovery means including means for sensing that the engine operating condition is below the second predetermined value and actuating the valve means to the open position when the engine operating condition is below the first predetermined value, and means for sensing actuation of the vehicle brake means and cancelling operation of the first fuel supply recovery means when the vehicle brake means is actuated.
Claim 5
Dependent Claim
78 words
Fuel control means in accordance with claim 2 in which said valve means is of an electromagnetic solenoid type and said first and second recovery means include circuit means for energizing the solenoid type valve means, said sensing means in the first and second recovery means respectively including switch means in said circuit means, the switch means in the first and second recovery means being adapted to be actuated respectively at the first and second engine operating conditions.
Claim 6
Dependent Claim
91 words
Fuel control means in accordance with claim 4 in which said solenoid type valve means is of a normally closed type and adapted to be opened when it is energized, said switch means in said first and second recovery means being of such types that are closed when the engine operating conditions are below the first and second engine operating conditions, respectively, said cancelling means including switch means which is opened when the vehicle brake means is actuated and connected in series with the switch means of the first recovery means.
Claim 7
Dependent Claim
93 words
Fuel control means in accordance with claim 1 in which said recovery means includes comparator means for comparing a signal representing the engine operating condition with a reference signal and producing a change in output when the engine operating condition signal is at a predetermined relationship with respect to the reference signal, means for changing level of the reference signal when the vehicle brake means is actuated, means responsive to the output of the comparator means for actuating the valve means when there is said change in the output of the comparator means.
Claim 8
Dependent Claim
52 words
Fuel control means in accordance with claim 6 in which said valve means is of an electro-magnetic solenoid type and said output responsive means includes switch means in circuit means for energizing the valve means, said switch means being actuated when there is a change in the output of the comparator means.
Claim 9
Dependent Claim
47 words
Fuel control means in accordance with claim 6 in which said recovery means includes parallel connected resistors for providing said reference signal, said level changing means including switch means connected in series with one of the resistors and being actuated when the vehicle brake means is actuated.
Claim 10
Dependent Claim
159 words
Fuel control means for vehicle engines which comprises slow fuel passage means for providing supply of fuel for slow engine operation, solenoid valve means provided in said slow fuel passage means and having an open and closed position, control means for said valve means, said control means including means for sensing a closed position of engine throttle valve means, whether the engine is above a first predetermined engine speed, whether the engine is above a second predetermined engine speed which is lower than the first predetermined engine speed but higher than engine idling speed, and an actuation of vehicle brake means and means for moving the solenoid valve means to the closed position only when the throttle valve means is closed and the engine is above the first predetermined speed independent of brake means actuation or when the throttle valve means is closed and the brake means is actuated only when the engine is above the second predetermined speed.
Claim 11
Dependent Claim
159 words
Fuel control means for vehicle engines which comprises slow fuel passage means for providing supply of fuel for slow engine operation, solenoid valve means provided in said slow fuel passage means and having an open and closed position, control means for said valve means, said control means including means for sensing a closed position of engine throttle valve means, whether the engine is above a first predetermined engine speed, whether the engine is above a second predetermined engine speed which is lower than the first predetermined engine speed but higher than engine idling speed, and an actuation of vehicle brake means and means for moving the solenoid valve means to the closed position only when the throttle valve means is closed and the engine is above the first predetermined speed independent of brake means actuation or when the throttle valve means is closed and the brake means is actuated only when the engine is above the second predetermined speed.
References Cited (Backward Citations)
US3455260A
Cited
US3756208A
Cited
US3751916A
Cited
US3799301A
Cited
US4026168A
Cited
DE2730386A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |