US3825239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark-ignition internal combustion engine carburetors
Assignee: Individual
•
Filing: 1972-08-21
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Granted: 1974-07-23
•
Expires: 1992-08-21
Abstract
Abstract A carburetor for spark-ignition internal combustion engines in which the desired fuel-air mixture is maintained by electronically comparing the temperatures of combustion of two sampling burning jets. One sample is enriched with pure fuel vapor, while the other sample is diluted with pure air. The combustion temperatures of both jets are sensed by electronic means and a constant temperature difference between them is maintained by regulating the fuel-air mixture. The mixture regulation is accomplished by electro-mechanical means.
Inventors
- 👤 E Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:27
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/12; F02M7/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
In combination with a carburetor having a barrel from which a fuel mixture is supplied to an intake manifold and valve means for selectively varying the air-fuel ratio of the fuel mixture, means for automatically adjusting the air-fuel ratio of the fuel mixture conducted to the manifold, comprising means connected to the barrel for sampling the fuel mixture, means connected to the sampling means for measuring the heat of combusTion of the sampled fuel mixture, and servo means connecting the measuring means to the valve means for correctively adjusting the air-fuel ratio, said sampling means comprising a pair of analyzer chambers, passage means connecting the barrel to said chambers downstream of the fuel nozzle, vacuum pump means connected to said chambers for drawing in the sampled fuel mixture, and means connected to the passage means for enriching one of the chambers with fuel vapor and diluting the other of the chambers with air.
Claim 2
Dependent Claim
153 words
In combination with a carburetor having a barrel from which a fuel mixture is supplied to an intake manifold and valve means for selectively varying the air-fuel ratio of the fuel mixture, means for automatically adjusting the air-fuel ratio of the fuel mixture conducted to the manifold, comprising means connected to the barrel for sampling the fuel mixture, means connected to the sampling means for measuring the heat of combusTion of the sampled fuel mixture, and servo means connecting the measuring means to the valve means for correctively adjusting the air-fuel ratio, said sampling means comprising a pair of analyzer chambers, passage means connecting the barrel to said chambers downstream of the fuel nozzle, vacuum pump means connected to said chambers for drawing in the sampled fuel mixture, and means connected to the passage means for enriching one of the chambers with fuel vapor and diluting the other of the chambers with air.
Claim 3
Dependent Claim
36 words
The combination of claim 1 wherein said servo means comprises signal amplifier means connected to said sensing means and balancing motor means differentially energized by signals from the amplifier means for displacement of the valve means.
Claim 4
Dependent Claim
40 words
The combination of claim 1 wherein said measuring means comprises means for igniting the sampled fuel mixture to produce combustion, sensing means for detecting heat generated by said combustion and reflector means for directing the heat toward the sensing means.
Claim 5
Dependent Claim
36 words
The combination of claim 3 wherein said servo means comprises signal amplifier means connected to said sensing means and balancing motor means differentially energized by signals from the amplifier means for displacement of the valve means.
Claim 6
Dependent Claim
43 words
The combination of claim 1 wherein said valve means includes a choke valve and a liquid fuel valve drivingly connected to the servo means, and a fuel nozzle conducting liquid fuel from the fuel valve into the barrel upstream of the sampling means.
Claim 7
Dependent Claim
40 words
The combination of claim 5 wherein said measuring means comprises means for igniting the sampled fuel mixture to produce combustion, sensing means for detecting heat generated by said combustion and reflector means for directing the heat toward the sensing means.
Claim 8
Dependent Claim
36 words
The combination of claim 6 wherein said servo means comprises signal amplifier means connected to said sensing means and balancing motor means differentially energized by signals from the amplifier means for displacement of the valve means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |