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US4744244A
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Cylinder pressure sensor output compensation method for internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1987-02-04
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Granted: 1988-05-17
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Expires: 2007-02-04
Abstract
Abstract A cylinder pressure sensor output compensation method for an internal combustion engine comprises the steps of determining the occurrence of a non-combustion state of engine operation, detecting the motoring cylinder pressure at this time, calculating a correction value (deviation) by comparing the detected motoring cylinder pressure with a reference value, and using this correction value to correct the sensor output during combustion of the engine. The method can be effectively applied to compensate for errors in sensor output due to variances in sensor characteristics from the time of manufacture or due to degradation through use.
Inventors
- 👤 Akira Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:52
CPC Classifications
F; F02; F02D; F02D35/00; F02D35/02; F02D35/023; F02D41/00; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2451; F02D41/2474; G; G01; G01M; G01M15/00; G01M15/04; G01M15/08; F02D41/26; F02D41/28; F02D2041/281
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A method for compensating a cylinder pressure sensor output for an internal combustion engine, comprising the steps of: detecting an occurrence of a predetermined operation state of the internal combustion engine; determining a cylinder pressure during the predetermined operating state; calculating a correction value from the detected cylinder pressure by comparing the cylinder pressure determined for a plurality of cylinders during the predetermined operating state; and using the correction value for correcting the fluctuation rate in maximum-pressure among the cylinders during an operating state of the engine other than the predetermined state.
Claim 2
Independent Claim
92 words
A method for compensating a cylinder pressure sensor output for an internal combustion engine, comprising the steps of: detecting an occurrence of a predetermined operation state of the internal combustion engine; determining a cylinder pressure during the predetermined operating state; calculating a correction value from the detected cylinder pressure by comparing the cylinder pressure determined for a plurality of cylinders during the predetermined operating state; and using the correction value for correcting the fluctuation rate in maximum-pressure among the cylinders during an operating state of the engine other than the predetermined state.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the predetermined operating state is a motoring state.
Claim 4
Dependent Claim
16 words
A method according to claim 2 wherein the motoring state is caused by a fuel cut.
Claim 5
Dependent Claim
15 words
A method according to claim 1 wherein said detected cylinder pressure is an averaged value.
Claim 6
Independent Claim
34 words
A method according to any one of claims 1, 2, 3, or 4 wherein said plurality of cylinders has pressure sensors respectively and the correction is carried out separately for each of the sensors.
Claim 7
Independent Claim
96 words
A method for compensating a cylinder pressure sensor output for an internal combustion engine, comprising the steps of: detecting the occurrence of a non-combustion state of the engine; determining a non-combustion value of the cylinder pressure during the non-combustion state; comparing the non-combustion value with a reference value; calculating a correction value based on the comparison of the non-combustion value and the reference value; detecting a combustion state of the engine; determining a combustion value of the cylinder pressure during the combustion state; and compensating the combustion value at the combustion state by the correction value.
Claim 8
Independent Claim
96 words
A method for compensating a cylinder pressure sensor output for an internal combustion engine, comprising the steps of: detecting the occurrence of a non-combustion state of the engine; determining a non-combustion value of the cylinder pressure during the non-combustion state; comparing the non-combustion value with a reference value; calculating a correction value based on the comparison of the non-combustion value and the reference value; detecting a combustion state of the engine; determining a combustion value of the cylinder pressure during the combustion state; and compensating the combustion value at the combustion state by the correction value.
Claim 9
Dependent Claim
36 words
A method according to claim 6 wherein said correction value is a deviation of the non-combustion value from the reference value, and the combustion value at the combustion state is compensated by adding the deviation thereto.
Claim 10
Dependent Claim
25 words
A method according to claim 6 wherein said correction value is an averaged value of a deviation of the non-combustion value from the reference value.
Claim 11
Dependent Claim
36 words
A method according to claim 6 wherein said correction value is a ratio of the non-combustion value to the reference value, and the combustion value at the combustion state is compensated by multiplying the ratio thereto.
Claim 12
Dependent Claim
25 words
A method according to claim 6 wherein said correction value is an averaged value of the ratio of the non-combustion value to the reference value.
Claim 13
Dependent Claim
15 words
A method according to claim 6 wherein said non-combustion state is caused by a fuel-cut.
Claim 14
Independent Claim
48 words
A method according to any one of claims 6, 7, 8, 9, 10, or 11 where said internal combustion engine is a multi-cylindered engine which has pressure sensors respectively for the multi-cylinders and the compensation of the combustion value is carried out separately for each of the sensors.
References Cited (Backward Citations)
US4531399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |