US4135480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark vacuum advance control
Assignee: Ethyl Corp
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Filing: 1977-05-13
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Granted: 1979-01-23
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Expires: 1997-05-13
Abstract
Abstract An ignition spark advance system for use with spark ignited internal combustion engines having an exhaust gas recycle system which includes EGR vacuum modulator means connected to and modulating an exhaust gas recycle valve. A conventional first vacuum actuated spark advance unit responsive to manifold vacuum signal cooperates with a second vacuum actuated spark advance unit responsive to EGR vacuum signal to advance the ignition spark. The second vacuum actuated spark advance unit provides additional spark advance during periods of lower intake manifold vacuum caused by exhaust gas recycle when the spark advance due to the first unit decreases.
Inventors
- 👤 Frederick J. Marsee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
178 words
In an ignition spark advance system for use with spark ignited internal combustion engines comprising in combination (a) an ignition distributor having a spark advance mechanism operated by a first vacuum actuated spark advance means, (b) a carburetor having a throttle plate and a spark advance port with said spark advance port located immediately upstream from said throttle plate, (c) a vacuum line operably connecting said spark advance port with said first spark advance means, (d) a vacuum actuated exhaust gas recycle valve, and (e) an EGR vacuum amplifier having a vacuum line operatively connected to and adapted to modulate said exhaust gas recycle valve in response to operating conditions of said engine, the improvement comprising a second vacuum actuated spark advance means, said second spark advance means being operatively connected to said EGR vacuum amplifier by said vacuum line and actuated by a vacuum signal from said EGR vacuum amplifier, said first and said second spark advance means cooperating in advancing the timing of said ignition spark advance system when said exhaust gas recycle valve is open.
Claim 2
Dependent Claim
178 words
In an ignition spark advance system for use with spark ignited internal combustion engines comprising in combination (a) an ignition distributor having a spark advance mechanism operated by a first vacuum actuated spark advance means, (b) a carburetor having a throttle plate and a spark advance port with said spark advance port located immediately upstream from said throttle plate, (c) a vacuum line operably connecting said spark advance port with said first spark advance means, (d) a vacuum actuated exhaust gas recycle valve, and (e) an EGR vacuum amplifier having a vacuum line operatively connected to and adapted to modulate said exhaust gas recycle valve in response to operating conditions of said engine, the improvement comprising a second vacuum actuated spark advance means, said second spark advance means being operatively connected to said EGR vacuum amplifier by said vacuum line and actuated by a vacuum signal from said EGR vacuum amplifier, said first and said second spark advance means cooperating in advancing the timing of said ignition spark advance system when said exhaust gas recycle valve is open.
Claim 3
Dependent Claim
34 words
The system of claim 1 wherein said second spark advance means in actuated when said vacuum signal from said EGR vacuum amplifier increases to a vacuum sufficient to open said exhaust gas recycle valve.
Claim 4
Dependent Claim
20 words
The system of claim 2 wherein said first and said second spark advance means are first and second diaphragm means.
Claim 5
Dependent Claim
18 words
The system of claim 3 wherein said first and said second diaphragm means are operatively connected in series.
Claim 6
Dependent Claim
18 words
The system of claim 3 wherein said first and said second diaphragm means are operatively connected in parallel.
Claim 7
Dependent Claim
22 words
The system of claim 2 wherein said EGR vacuum amplifier has a vacuum output signal modulated in response to carburetor venturi vacuum.
Claim 8
Dependent Claim
18 words
The system of claim 6 wherein said first and said second diaphragm means are operatively connected in series.
Claim 9
Dependent Claim
18 words
The system of claim 6 wherein said first and said second diaphragm means are operatively connected in parallel.
Claim 10
Dependent Claim
46 words
The system of claim 2 further characterized by including a vacuum delay means in said vacuum signal to said second spark advance means adapted to delay the actuation of said second spark advance means for a predetermined time period after said exhaust gas recycle valve opens.
Claim 11
Dependent Claim
46 words
The system of claim 6 further characterized by including a vacuum delay means in said vacuum signal to said second spark advance means adapted to delay the actuation of said second spark advance means for a predetermined time period after said exhaust gas recycle valve opens.
Claim 12
Dependent Claim
21 words
The system of claim 4 wherein said first and said second diaphragm means are operatively connected to each other in series.
Claim 13
Dependent Claim
25 words
The system of claim 4 wherein said first and said second diaphragm means are operatively connected to said ignition distributor spark advance means in series.
Claim 14
Dependent Claim
21 words
The system of claim 5 wherein said first and said second diaphragm means are operatively connected to each other in parallel.
Claim 15
Dependent Claim
25 words
The system of claim 5 wherein said first and said second diaphragm means are operatively connected to said ignition distributor spark advance means in parallel.
References Cited (Backward Citations)
US4040401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |