Patent US5033438A successfully refreshed from Google Patents.
US5033438A
Expired / Lapsed
US
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Method and device for improving the exhaust-gas behavior or mixture-compressing internal combustion engines
Assignee: Mannesmann VDO AG
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Filing: 1990-08-31
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Granted: 1991-07-23
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Expires: 2010-08-31
Abstract
Abstract A method for improving the exhaust-gas behavior of mixture-compressing internal combustion engines. The output signal of an oxygen measurement probe arranged in the exhaust gas channel of the internal combustion engine is divided within the voltage region in question into a number of sections and a corrected voltage value is stored in a memory for each section.
Inventors
- 👤 Martin Feldinger
- 👤 Joachim Tambosi
- 👤 Uwe Marz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:59
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/4065; F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1477; F02D41/148; F02D41/1493; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2451; F02D41/2474; F02D41/26; F02D41/28; F02D41/1444; F02D41/1454; F02D41/1456; F02D41/2454
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A method for improving the exhaust-gas behavior of mixture-comprising internal combustion engines, the engine being operative with a controller, there being an oxygen measurement probe, disposed in an exhaust channel of the engine, the method comprising the steps of feeding the output signal of the probe to the controller, the output voltage of the controller respresenting a setting variable for controlling the fuel-air ratio of the engine. dividing the voltage range of an output signal of the probe into a fixed number of individual steps, storing a corrected voltage value in a memory for each of said steps, and employing the corrected voltage values as a basis for a further processing of the signal.
Claim 2
Independent Claim
114 words
A method for improving the exhaust-gas behavior of mixture-comprising internal combustion engines, the engine being operative with a controller, there being an oxygen measurement probe, disposed in an exhaust channel of the engine, the method comprising the steps of feeding the output signal of the probe to the controller, the output voltage of the controller respresenting a setting variable for controlling the fuel-air ratio of the engine. dividing the voltage range of an output signal of the probe into a fixed number of individual steps, storing a corrected voltage value in a memory for each of said steps, and employing the corrected voltage values as a basis for a further processing of the signal.
Claim 3
Dependent Claim
70 words
The method according to claim 1, further comprising the steps of converting the analog output signal of the oxygen measurement probe by an analog-digital conversion into a digital signal; said storing step employs a correction table for each detectable value of the probe output signal, the table being stored in a read-only memory; and using the corrected signal from the output of the read-only memory for controlling the gas mixture.
Claim 4
Dependent Claim
26 words
The method according to claim 2, wherein the corrected voltage values are referred to the actual fuel-air ratio in a selectable course of the characteristic curve.
Claim 5
Dependent Claim
26 words
The method according to claim 1, wherein the corrected voltage values are referred to the actual fuel-air ratio in a selectable course of the characteristic curve.
Claim 6
Dependent Claim
27 words
The method according to claim 2, wherein the corrected voltage values are referred to the actual fuel-air ratio to give a linear course of the characteristic curves.
Claim 7
Dependent Claim
33 words
The method according to claim 2, wherein the corrected voltage values referred to the actual fuel-air ratio give a progressive course of the characteristic curve on both sides of the fuel-air ratio, lambda=1.
Claim 8
Independent Claim
96 words
A device for linearizing fuel-air ratio measurements of an oxygen probe for an internal combustion engine comprising; an analog-to-digital converter, a read-only memory, and a controller, the converter connecting an oxygen probe to an imput of the memory for addressing the memory to output a correct value of an oxygen measurement of the probe; and wherein a correction table is stored in the read-only memory, and at the output of the memory there is obtained a changed probe signal which is fed to an input of the controller for controlling the composition of the fuel-air mixture.
Claim 9
Independent Claim
96 words
A device for linearizing fuel-air ratio measurements of an oxygen probe for an internal combustion engine comprising; an analog-to-digital converter, a read-only memory, and a controller, the converter connecting an oxygen probe to an imput of the memory for addressing the memory to output a correct value of an oxygen measurement of the probe; and wherein a correction table is stored in the read-only memory, and at the output of the memory there is obtained a changed probe signal which is fed to an input of the controller for controlling the composition of the fuel-air mixture.
Claim 10
Dependent Claim
42 words
A device according to claim 7, wherein said controller operates on analog signals, said device further comprising a digital-to-analog converter connecting an output of the memory to an input of the controller for converting digital signals of the memory to analog format.
References Cited (Backward Citations)
US3906207A
Cited
FR2355437A6
Cited
US4019474A
Cited
US4116170A
Cited
US4337745A
Cited
EP0067931A2
Cited
EP0123064A1
Cited
FR2570127A1
Cited
GB2193327A
Cited
EP0305998A2
Cited
US4917067A
Cited
US4964390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |