US3646920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor fuel pump pressure-actuated spark timing control
Assignee: Ford Motor Co
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Filing: 1970-12-02
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Granted: 1972-03-07
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Expires: 1990-12-02
Abstract
Abstract The vacuum line between the carburetor spark port and the engine distributor breaker plate servo actuator includes an air bleed valve that is normally closed to permit normal advance of the engine timing as a function of spark port vacuum changes, but opens during vehicle accelerations to bleed air to the distributor servo to condition the timing for retarded operation; the bleed valve being opened in response to fuel pressure in the carburetor accelerating pump fuel well acting on a diaphragm attached to the valve during operation of the pump, and, of which the following is a specification.
Inventors
- 👤 Richard D Vartanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:35
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
206 words
A motor vehicle spark timing control system comprising, an engine carburetor having an accelerator pump containing fuel, an induction passage containing a spark port located above the idle speed position of a throttle valve controlling flow through the passage and subject to the depression in the carburetor as a function of the movement of the throttle valve from its idle speed position, an engine distributor having a breaker plate pivotally movable in opposite directions to advance and retard the spark timing, vacuum-controlled servo means connected to said breaker plate for moving the same, and control means between said spark port and servo means to control the application of vacuum from said spark port to said servo means, said control means including conduit means connecting the vacuum at said spark port to said servo means for effecting variable movement of said breaker plate from a maximum retard setting at closed throttle valve idle speed position to a maximum advance setting at high spark port off-idle vacuum levels, and an air bleed means openable by and in response to an increase in fuel pressure in said accelerator pump upon operation thereof to bleed air to said servo means to position said breaker plate at a maximum retard setting.
Claim 2
Dependent Claim
206 words
A motor vehicle spark timing control system comprising, an engine carburetor having an accelerator pump containing fuel, an induction passage containing a spark port located above the idle speed position of a throttle valve controlling flow through the passage and subject to the depression in the carburetor as a function of the movement of the throttle valve from its idle speed position, an engine distributor having a breaker plate pivotally movable in opposite directions to advance and retard the spark timing, vacuum-controlled servo means connected to said breaker plate for moving the same, and control means between said spark port and servo means to control the application of vacuum from said spark port to said servo means, said control means including conduit means connecting the vacuum at said spark port to said servo means for effecting variable movement of said breaker plate from a maximum retard setting at closed throttle valve idle speed position to a maximum advance setting at high spark port off-idle vacuum levels, and an air bleed means openable by and in response to an increase in fuel pressure in said accelerator pump upon operation thereof to bleed air to said servo means to position said breaker plate at a maximum retard setting.
Claim 3
Dependent Claim
98 words
A control system as in claim 1, said accelerator pump including a manually operable linkage connected to a piston means movable in a first chamber containing fuel, said chamber having a first restricted outlet and a second outlet connected to a second chamber containing fuel, said second chamber being defined in part by a wall connected to said air bleed means and movable in one direction upon an increase in the pressure of said fuel in said chambers, said air bleed means including a normally closed vent openable by said wall upon movement thereof in said one direction.
Claim 4
Dependent Claim
97 words
A control system as in claim 1, said accelerator pump and air bleed means including first and second interconnected chambers containing fuel, accelerator pump linkage actuated means in said first chamber movable to pressurize the fuel in said chambers, means in one of said chambers to bleed fuel therefrom, and movable spring-biased means in said second chamber defining a wall thereof connected to said air bleed means for an opening movement of said air bleed means upon pressurization of said chambers, said fuel bleed means providing a slow return movement of said wall to a non-air-bleeding position.
Claim 5
Dependent Claim
32 words
A control system as in claim 3, including means interconnecting said chambers comprising slow-fast rate flow means permitting unrestricted flow in one direction and a restricted delayed flow in the opposite direction.
Claim 6
Dependent Claim
64 words
A control system as in claim 4, said flow means comprising a valve in the interconnection between chambers unseatable by fuel pressure in one direction thereagainst to a position for free fuel flow between said chambers, said valve containing an orifice for limited communication at all times between said chambers and upon seating of said valve by fuel pressure thereagainst in the opposite direction.
Claim 7
Dependent Claim
14 words
A control system as in claim 5, said valve comprising a floatable flat plate.
Claim 8
Dependent Claim
114 words
A control system as in claim 1, said air bleed means including a reciprocable spring-biased valve movable into and operably out of said conduit means and operably connected to the fuel in said accelerator pump so as to be movable thereby in one direction in response to changes in pressure thereof, an atmospheric airport connected to said conduit means, said valve in one position opening said airport to connect atmospheric pressure to said servo means while blocking flow from said spark port to retard said timing, and in a second position blocking said airport while connecting said spark port and servo means to advance said timing as a function of spark port vacuum changes.
Claim 9
Dependent Claim
36 words
A control system as in claim 7, said airport including a valve normally closing said airport and engageable and movable by said valve to open said port upon movement of said valve to said one position.
Claim 10
Dependent Claim
31 words
A control system as in claim 7, including a lost motion connection between said valve and the fuel in said accelerator pump effecting a delay in the movement of said valve.
Claim 11
Dependent Claim
93 words
A control system as in claim 7, said accelerator pump including first and second interconnected chambers containing fuel, accelerator pump linkage actuated means in said first chamber movable to pressurize the fuel in said chambers, means in one of said chambers to bleed fuel therefrom, and movable spring-biased means in said second chamber defining a wall thereof connected to said air bleed means for an opening movement of said air bleed means upon pressurization of said chambers, said fuel bleed means providing a slow return movement of said wall to a non-air-bleeding position.
Claim 12
Dependent Claim
32 words
A control system as in claim 10, including means interconnecting said chambers comprising slow-fast rate flow means permitting unrestricted flow in one direction and a restricted delayed flow in the opposite direction.
Claim 13
Dependent Claim
64 words
A control system as in claim 11, said flow means comprising a valve in the interconnection between chambers unseatable by fuel pressure in one direction thereagainst to a position for free fuel flow between said chambers, said valve containing an orifice for limited communication at all times between said chambers and upon seating of said valve by fuel pressure thereagainst in the opposite direction.
Claim 14
Dependent Claim
14 words
A control system as in claim 12, said valve comprising a floatable flat plate.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |