US3577962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Throttle blade control system for minimizing variations in idling speed
Assignee: Ford Motor Co
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Filing: 1969-10-20
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Granted: 1971-05-11
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Expires: 1989-10-20
Abstract
Abstract A cam having an effectively V-shaped cam surface is positioned by engine intake manifold pressure modulated according to engine speed above a predetermined value to control the idling position of the carburetor throttle blade. Engine idling speed resulting from the system is constant within 60 r.p.m. for all conditions of engine temperature and the number of actuated engine driven accessories. The system also opens the throttle blade slightly during engine deceleration to improve exhaust emissions.
Inventors
- 👤 William K Ojala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:33
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/06; F02M3/062
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
160 words
In an internal combustion engine having an induction passage for delivering air to a combustion chamber of said engine and a throttle blade for controlling flow through said induction passage, an idling speed control system comprising sensing means responsive to the rotational speed of said engine, said sensing means including an engine speed responsive valve means connected to the induction passage downstream of the throttle blade, throttle blade positioning means controlled by said sensing means for maintaining the throttle blade in a position where said engine idles at a substantially constant speed regardless of the load placed on the engine by engine driven accessories, said throttle blade positioning means including a vacuum motor connected to said speed responsive valve means, a cam means movable by said vacuum motor, and a cam follower connected to said throttle blade, said cam follower riding on said cam means to position the throttle blade according to engine manifold pressure as modulated by engine speed.
Claim 2
Dependent Claim
160 words
In an internal combustion engine having an induction passage for delivering air to a combustion chamber of said engine and a throttle blade for controlling flow through said induction passage, an idling speed control system comprising sensing means responsive to the rotational speed of said engine, said sensing means including an engine speed responsive valve means connected to the induction passage downstream of the throttle blade, throttle blade positioning means controlled by said sensing means for maintaining the throttle blade in a position where said engine idles at a substantially constant speed regardless of the load placed on the engine by engine driven accessories, said throttle blade positioning means including a vacuum motor connected to said speed responsive valve means, a cam means movable by said vacuum motor, and a cam follower connected to said throttle blade, said cam follower riding on said cam means to position the throttle blade according to engine manifold pressure as modulated by engine speed.
Claim 3
Dependent Claim
73 words
The engine of claim 1 in which the speed responsive valve means comprises a shaft rotating with the engine, centrifugal weight means mounted on said shaft, spring means normally urging said weight means toward the axis of said shaft, and a valve actuated by said weight means, said valve being opened to connect the induction passage downstream of said throttle blade to the vacuum motor when shaft rotational speed exceeds a predetermined value.
Claim 4
Dependent Claim
36 words
The engine of claim 2 in which the amount of opening of said valve is modulated by increasing vehicle speed above said predetermined value to modulate the amount of manifold pressure applied to said vacuum motor.
Claim 5
Dependent Claim
55 words
The engine of claim 3 in which the cam means has an effectively V-shaped cam surface, said cam follower producing normal engine idling speed when contacting the cam surface at the point of the V and increasing the opening of tHe throttle blade when moved in either direction away from the point of the V.
Claim 6
Dependent Claim
35 words
The engine of claim 4 in which the sensing means connects the vacuum motor to a point in the induction passage located just below the idling position of the trailing edge of the throttle blade.
Claim 7
Dependent Claim
108 words
The engine of claim 5 in which the shaft has a radially extending sleeve attached thereto, said weight means being located movably on said sleeve, said shaft having a passage communicating with the induction passage downstream of the throttle blade, said passage opening into said sleeve, said sleeve having a port therein that connects with the passage, said spring means being a coil spring located on said sleeve and having one end fastened to the sleeve and the other end fastened to said weight means, said spring resisting radial movement of said weight means, said weight means exposing said port when shaft rotational speed exceeds a predetermined value.
Claim 8
Dependent Claim
55 words
The engine of claim 1 in which the cam means has an effectively V-shaped cam surface, said cam follower producing normal engine idling speed when contacting the cam surface at the point of the V and increasing the opening of the throttle blade when moved in either direction away from the point of the V.
Claim 9
Dependent Claim
35 words
The engine of claim 1 in which the sensing means connects the vacuum motor to a point in the induction passage located just below the idling position of the trailing edge of the throttle blade.
Claim 10
Dependent Claim
85 words
The engine of claim 1 in which the speed responsive valve means comprises a shaft rotating with the engine, said shaft having a magnetized portion, a pivotable shaft having a magnet positioned adjacent said magnetized portion of said rotating shaft, and a valve mechanism actuated by said pivotable shaft that opens when said pivotable shaft is pivoted by the rotating magnetic field produced by rotation of said rotating shaft, said valve mechanism connecting the induction passage downstream of said throttle blade to the vacuum motor.
Claim 11
Dependent Claim
87 words
The engine of claim 9 in which the valve mechanism comprises a passage in said pivotable shaft communicating with said induction passage downstream of said throttle blade, said pivotable shaft having a radial port communicating with the passage, and a sleeve surrounding said pivotable shaft, said sleeve having a radial port communicating with said vacuum motor, said pivotable shaft pivoting under the force applied thereto by the rotating magnetic field to overlap said ports with each other and thereby connect the induction passage with the vacuum motor.
Claim 12
Dependent Claim
55 words
The engine of claim 10 in which the cam means has an effectively V-shaped cam surface, said cam follower producing normal engine idling speed when contacting the cam surface at the point of the V and increasing the opening of the throttle blade when moved in either direction away from the point of the V.
Claim 13
Dependent Claim
35 words
The engine of claim 11 in which the sensing means connects the vacuum motor to a point in the induction passage located just below the idling position of the trailing edge of the throttle blade.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |