US4050425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-fuel ratio control system
Assignee: Motors Liquidation Co
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Filing: 1975-11-24
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Granted: 1977-09-27
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Expires: 1995-11-24
Abstract
Abstract An air-fuel ratio control system for an internal combustion engine supplies a very small sample of the air-fuel mixture being inducted to an air-fuel ratio sensor. A heater heats the sensor and also heats and ignites the air-fuel mixture sample at the sensor. A fuel system control controlled by the sensor then adjusts the air-fuel ratio of the mixture being inducted into the engine to the stoichiometric value.
Inventors
- 👤 Bruce W. Holleboom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:11
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1439; F02D41/144
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
An air-fuel ratio control system for a throttled internal combustion engine comprising air-fuel ratio sensing means, means for supplying an unaltered sample of the throttled air-fuel mixture being inducted into said engine to said air-fuel ratio sensing means and then returning the sample for induction into the engine, ignition means for igniting the air-fuel mixture sample at said air-fuel ratio sensing means, and fuel system control means controlled by said air-fuel ratio sensing means for adjusting the fuel flow and thereby the air-fuel ratio of the mixture being inducted into the engine toward the stoichiometric value.
Claim 2
Dependent Claim
96 words
An air-fuel ratio control system for a throttled internal combustion engine comprising air-fuel ratio sensing means, means for supplying an unaltered sample of the throttled air-fuel mixture being inducted into said engine to said air-fuel ratio sensing means and then returning the sample for induction into the engine, ignition means for igniting the air-fuel mixture sample at said air-fuel ratio sensing means, and fuel system control means controlled by said air-fuel ratio sensing means for adjusting the fuel flow and thereby the air-fuel ratio of the mixture being inducted into the engine toward the stoichiometric value.
Claim 3
Dependent Claim
110 words
An air-fuel ratio control system for a throttled internal combustion engine comprising air-fuel ratio sensing means including a zirconia cell, means including a vacuum pump for directing an unaltered sample of the throttled air-fuel mixture being inducted into said engine toward said zirconia cell and then returning the sample for induction into the engine, heater-ignition means for heating said air-fuel ratio sensing means and also heating and igniting the air-fuel mixture sample at said zirconia cell, and fuel system control means controlled by said air-fuel ratio sensing means for adjusting the fuel flow and thereby the air-fuel ratio of the mixture being inducted into the engine toward the stoichiometric value.
Claim 4
Dependent Claim
110 words
An air-fuel ratio control system for a throttled internal combustion engine comprising air-fuel ratio sensing means including a zirconia cell, means including a vacuum pump for directing an unaltered sample of the throttled air-fuel mixture being inducted into said engine toward said zirconia cell and then returning the sample for induction into the engine, heater-ignition means for heating said air-fuel ratio sensing means and also heating and igniting the air-fuel mixture sample at said zirconia cell, and fuel system control means controlled by said air-fuel ratio sensing means for adjusting the fuel flow and thereby the air-fuel ratio of the mixture being inducted into the engine toward the stoichiometric value.
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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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |