US3738341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the air-fuel ratio {80 {11 in a combustion engine
Assignee: US Philips Corp
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Filing: 1972-05-01
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Granted: 1973-06-12
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Expires: 1992-05-01
Abstract
Abstract Device for controlling the air-fuel ratio lambda of the mixture supplied to a combustion engine, comprising a pick-up sensitive to the carbon monoxide content of a gas mixture and arranged in an exhaust gas duct of the engine and producing a voltage increasing with said content, a member for controlling the air-fuel ratio lambda and a feedback mechanism acting upon said member so that the ratio lambda is increased when the voltage produced by the pick-up increases.
Inventors
- 👤 C Loos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:29
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/4065; F; F02; F02D; F02D35/00; F02D35/0015; F02D35/0046; F02D35/0053; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1452; F02D41/1453; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
172 words
A device for automatic control of the air-fuel ratio lambda of the mixture supplied to a combustion engine, including an exhaust gas duct through which exhausts gas having a varying percentage of CO, the device comprising a pick-up formed as a partition of at least one solid substances, such as zirconium oxide, which is coated on both sides with a porous electrode layer such as platinum, said pick-up partition formed as part of said exhaust gas duct with one of said sides contacted by said exhaust gases and the other side contacted by atmoshperic air, said pick-up, when its partition is contacted on opposite sides by gases having different oxygen concentration, producing an electrical potentional between said electrode layers, the voltage increasing with an increase in CO on the exhaust gas side, a member for physically controlling the air-ufel ratio lambda , and feedback means responsive to said voltage and any cHange thereof and correspondingly acting upon said member, the ratio lambda being raised when the voltage produced by the pick-up increases.
Claim 2
Independent Claim
172 words
A device for automatic control of the air-fuel ratio lambda of the mixture supplied to a combustion engine, including an exhaust gas duct through which exhausts gas having a varying percentage of CO, the device comprising a pick-up formed as a partition of at least one solid substances, such as zirconium oxide, which is coated on both sides with a porous electrode layer such as platinum, said pick-up partition formed as part of said exhaust gas duct with one of said sides contacted by said exhaust gases and the other side contacted by atmoshperic air, said pick-up, when its partition is contacted on opposite sides by gases having different oxygen concentration, producing an electrical potentional between said electrode layers, the voltage increasing with an increase in CO on the exhaust gas side, a member for physically controlling the air-ufel ratio lambda , and feedback means responsive to said voltage and any cHange thereof and correspondingly acting upon said member, the ratio lambda being raised when the voltage produced by the pick-up increases.
Claim 3
Dependent Claim
46 words
A device according to claim 1 further comprising a temperature pick-up disposed near the first-mentioned pick-up, and in the feedback means an electronic distribution circuit by which the voltage produced by the first pick-up is corrected in accordance with the signal produced by the temperature pick-up.
Claim 4
Dependent Claim
16 words
A device according to claim 1 wherein the feedback means includes an amplifier having integrating properties.
Claim 5
Dependent Claim
24 words
A device according to claim 1 wherein the feedback means includes a servo-motor acting upon the member for controlling the air-fuel ratio lambda .
Claim 6
Dependent Claim
71 words
A device according to claim 1 for controlling an engine driving a vehicle, the device comprising a pick-up converting the position of a control-member regulating the gas mixture taken in by the engine into a voltage and a differentiating network converting a comparatively rapid variation of said voltage into a voltage peak which temporarily reduces the adjusted air-fuel ratio lambda at a rapid movement of the control-member in the opening sense.
Claim 7
Dependent Claim
24 words
A device according to claim 5 further comprising means for restricting the amplitude of the temporary reduction of the adjusted air-fuel ratio lambda .
Claim 8
Independent Claim
147 words
A device for automatic control of the air-fuel ratio of the mixture supplied to a combustion engine including an exhaust duct, the device comprising a pick-up disposed in said exhaust gas duct and formed as a partition of at least one solid substance, such as zirconium oxide, which is coated on both sides with a porous electrode layer, such as platinum, said pick-up producing a potential difference between the electrode layers in the presence of different oxygen concentrations on either side of said partition, one of said sides contacting the exhaust gases in said exhaust gas duct, the other side contacting oxygen with a reference concentration, the device further comprising a member for controlling the air-fuel ratio lambda , and a feedback means acting upon said member in response to said potential difference and any change thereof, the ratio lambda being automatically adjusted to a desired value.
Claim 9
Independent Claim
147 words
A device for automatic control of the air-fuel ratio of the mixture supplied to a combustion engine including an exhaust duct, the device comprising a pick-up disposed in said exhaust gas duct and formed as a partition of at least one solid substance, such as zirconium oxide, which is coated on both sides with a porous electrode layer, such as platinum, said pick-up producing a potential difference between the electrode layers in the presence of different oxygen concentrations on either side of said partition, one of said sides contacting the exhaust gases in said exhaust gas duct, the other side contacting oxygen with a reference concentration, the device further comprising a member for controlling the air-fuel ratio lambda , and a feedback means acting upon said member in response to said potential difference and any change thereof, the ratio lambda being automatically adjusted to a desired value.
Claim 10
Dependent Claim
60 words
A device as claimed in claim 7 wherein said pick-up arranged in the exhaust branch pipe of the engine so that its partition wall forms part of the wall of said branch pipe, whereby one side is in contact with the flue gases of the engine and the other side with the atmospheric air comprising the said oxygen reference concentration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |