US3789702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum control for carburetor power enrichment apparatus
Assignee: Motors Liquidation Co
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Filing: 1972-03-15
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Granted: 1974-02-05
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Expires: 1992-03-15
Abstract
Abstract A solenoid valve is normally opened to bleed a part of the engine vacuum applied to operate the power enrichment system of an internal combustion engine carburetor. A transmission controlled switch closes the solenoid valve when the transmission shifts to a high drive ratio from a lower drive ratio. Since the power system varies the flow of enriched fuel inversely with engine vacuum, closure of the valve delays the commencement of fuel enrichment until the engine vacuum falls below a level lower than that at which enrichment is normally commenced with the valve open.
Inventors
- 👤 R Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:16
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/12; F02M7/133
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
In combination with an internal combustion engine providing a source of variable engine vacuum and a carburetor providing an air fuel mixture to said engine: a. fuel metering valve means operable to normally increasingly enrich the fuel flow to said engine as said variable engine vacuum decreases below a first predetermined vacuum level; and b. vacuum control means responsive to a signal indicating vehicle speed and including energizable solenoid valve means and transmission controlled switch means for energizing said solenoid valve means, said transmission controlled switch means having a first condition for causing said solenoid valve means to normally allow said metering valve means to normally enrich said fuel flow and second condition for causing said solenoid valve means to delay said fuel metering valve means from enriching fuel flow until said engine vacuum decreases below a second predetermined vacuum level less than said first predetermined level.
Claim 2
Dependent Claim
147 words
In combination with an internal combustion engine providing a source of variable engine vacuum and a carburetor providing an air fuel mixture to said engine: a. fuel metering valve means operable to normally increasingly enrich the fuel flow to said engine as said variable engine vacuum decreases below a first predetermined vacuum level; and b. vacuum control means responsive to a signal indicating vehicle speed and including energizable solenoid valve means and transmission controlled switch means for energizing said solenoid valve means, said transmission controlled switch means having a first condition for causing said solenoid valve means to normally allow said metering valve means to normally enrich said fuel flow and second condition for causing said solenoid valve means to delay said fuel metering valve means from enriching fuel flow until said engine vacuum decreases below a second predetermined vacuum level less than said first predetermined level.
Claim 3
Dependent Claim
233 words
In combination with an internal combustion engine providing a source of variable engine vacuum and a carburetor for providing an air fuel mixture to said engine: a. a vacuum unit for advancing the timing of ignition in said engine when said vacuum is communicated to said vacuum unit; b. fuel metering valve means operable to normally increasingly enrich the fuel flow to said engine as said variable engine vacuum decreases below a first predetermined vacuum level; c. solenoid valve means operable to normally allow said metering valve means to normally enrich said fuel flow and to otherwise prevent said fuel metering valve means from enriching said fuel flow until said engine vacuum decreases below a second predetermined vacuum level less than said first level; and d. control means responsive to a signal indicating vehicle speed for controlling said solenoid valve means and said vacuum advance unit and having a first condition operable to normally prevent said vacuum from being communicated to said vacuum unit while also causing said solenoid means to normally allow said metering valve means to normally enrich said fuel flow and having a second condition for permitting said vacuum to be communicated to said vacuum unit while also causing said solenoid to prevent said fuel metering valve means from enriching said fuel flow until said engine vacuum decreases below a second predetermined vacuum level less than said first predetermined level.
Claim 4
Dependent Claim
233 words
In combination with an internal combustion engine providing a source of variable engine vacuum and a carburetor for providing an air fuel mixture to said engine: a. a vacuum unit for advancing the timing of ignition in said engine when said vacuum is communicated to said vacuum unit; b. fuel metering valve means operable to normally increasingly enrich the fuel flow to said engine as said variable engine vacuum decreases below a first predetermined vacuum level; c. solenoid valve means operable to normally allow said metering valve means to normally enrich said fuel flow and to otherwise prevent said fuel metering valve means from enriching said fuel flow until said engine vacuum decreases below a second predetermined vacuum level less than said first level; and d. control means responsive to a signal indicating vehicle speed for controlling said solenoid valve means and said vacuum advance unit and having a first condition operable to normally prevent said vacuum from being communicated to said vacuum unit while also causing said solenoid means to normally allow said metering valve means to normally enrich said fuel flow and having a second condition for permitting said vacuum to be communicated to said vacuum unit while also causing said solenoid to prevent said fuel metering valve means from enriching said fuel flow until said engine vacuum decreases below a second predetermined vacuum level less than said first predetermined level.
Claim 5
Dependent Claim
271 words
In combination with an internal combustion engine for providing a source of variable engine vacuum signals and a carburetor for providing an air fuel mixture to said engine: a. a transmission with an input connected to said engine and an output connected to a load, said transmission having variable drive ratio means for varying the ratio of the speed of the output to the speed of the input from a high drive ratio to a lower drive ratio; b. fuel metering valve means operable to normally increasingly enrich the fuel flow to said engine as said engine vacuums decrease below a first predetermined vacuum level, said fuel metering valve means normally enriching said fuel flow by providing a flow area increasing from a minimum to a maximum flow area as said vacuum decreases below said first level; c. solenoid valve means operable to normally allow said fuel metering valve means to normally enrich said fuel flow and to otherwise prevent said fuel metering valve means from providing a flow area between said minimum and maximum flow areas until said engine vacuums decrease below a second predetermined vacuum level less than said first level; and d. transmission controlled switch means having a first condition for causing said solenoid valve means to normally allow said fuel metering valve means to normally enrich said fuel flow and a second condition when said transmission is in said high drive ratio to cause said solenoid valve means to prevent said fuel metering valve means from increasing said flow area between said minimum and maximum flow areas until said engine vacuums decrease below said second predetermined level.
Claim 6
Dependent Claim
271 words
In combination with an internal combustion engine for providing a source of variable engine vacuum signals and a carburetor for providing an air fuel mixture to said engine: a. a transmission with an input connected to said engine and an output connected to a load, said transmission having variable drive ratio means for varying the ratio of the speed of the output to the speed of the input from a high drive ratio to a lower drive ratio; b. fuel metering valve means operable to normally increasingly enrich the fuel flow to said engine as said engine vacuums decrease below a first predetermined vacuum level, said fuel metering valve means normally enriching said fuel flow by providing a flow area increasing from a minimum to a maximum flow area as said vacuum decreases below said first level; c. solenoid valve means operable to normally allow said fuel metering valve means to normally enrich said fuel flow and to otherwise prevent said fuel metering valve means from providing a flow area between said minimum and maximum flow areas until said engine vacuums decrease below a second predetermined vacuum level less than said first level; and d. transmission controlled switch means having a first condition for causing said solenoid valve means to normally allow said fuel metering valve means to normally enrich said fuel flow and a second condition when said transmission is in said high drive ratio to cause said solenoid valve means to prevent said fuel metering valve means from increasing said flow area between said minimum and maximum flow areas until said engine vacuums decrease below said second predetermined level.
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |