US5806014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion control of an internal combustion engine proximate an extinction limit
Assignee: Aumovio Systems Inc
•
Filing: 1997-11-12
•
Granted: 1998-09-08
•
Expires: 2017-11-12
Abstract
Abstract A method and system of combustion control for an internal combustion engine (313) proximate an extinction limit includes measurement of acceleration behavior of the internal combustion engine and providing a measure of combustion variability dependent thereon. Preferably, the combustion variability measure is derived by one or more stochastically based methods (607). Operation of the internal combustion engine (313) is controlled dependent on the combustion variability measurement. Fuel, ignition, and exhaust gas recirculation may all be controlled by the derived combustion variability measurement to significantly reduce hydrocarbon (HC) and NOx emissions.
Inventors
- 👤 Donald J. Remboski
- 👤 Steven L. Plee
- 👤 Marvin L. Lynch
- 👤 Michael A. McClish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:07
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0097; F02D41/02; F02D41/14; F02D41/1497; F02D41/1498; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1015
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
84 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring crankshaft acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; establishing a sub-misfire amplitude threshold; establishing a misfire amplitude threshold; and analyzing behavior of the raw acceleration signal bounded between the sub-misfire and misfire amplitude thresholds and providing the combustion variability signal dependent thereon; and controlling fueling operation of the internal combustion engine dependent on the combustion variability signal.
Claim 2
Independent Claim
84 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring crankshaft acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; establishing a sub-misfire amplitude threshold; establishing a misfire amplitude threshold; and analyzing behavior of the raw acceleration signal bounded between the sub-misfire and misfire amplitude thresholds and providing the combustion variability signal dependent thereon; and controlling fueling operation of the internal combustion engine dependent on the combustion variability signal.
Claim 3
Dependent Claim
27 words
A method in accordance with claim 1 wherein the sub-misfire amplitude threshold is determined dependent on one or more of engine speed, engine load; and engine temperature.
Claim 4
Dependent Claim
27 words
A method in accordance with claim 2 wherein the misfire amplitude threshold is determined dependent on one or more of engine speed; engine load; and engine temperature.
Claim 5
Independent Claim
33 words
A method in accordance with 1 wherein the step of analyzing behavior comprises a step of: determining a standard deviation of the raw acceleration signal and providing the combustion variability signal dependent thereon.
Claim 6
Independent Claim
33 words
A method in accordance with 1 wherein the step of analyzing behavior comprises a step of: determining a standard deviation of the raw acceleration signal and providing the combustion variability signal dependent thereon.
Claim 7
Independent Claim
52 words
A method in accordance with 4 wherein the step of analyzing behavior comprises a step of: measuring engine load; and wherein the step of providing the combustion variability signal provides the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load.
Claim 8
Independent Claim
52 words
A method in accordance with 4 wherein the step of analyzing behavior comprises a step of: measuring engine load; and wherein the step of providing the combustion variability signal provides the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load.
Claim 9
Independent Claim
30 words
A method in accordance with 1 wherein the step of analyzing behavior comprises a step of: providing the combustion variability signal dependent on a skewness of the raw acceleration signal.
Claim 10
Independent Claim
30 words
A method in accordance with 1 wherein the step of analyzing behavior comprises a step of: providing the combustion variability signal dependent on a skewness of the raw acceleration signal.
Claim 11
Independent Claim
30 words
A method in accordance with 1 wherein the step of analyzing behavior comprises a step of: providing the combustion variability signal dependent on a mean of the raw acceleration signal.
Claim 12
Independent Claim
30 words
A method in accordance with 1 wherein the step of analyzing behavior comprises a step of: providing the combustion variability signal dependent on a mean of the raw acceleration signal.
Claim 13
Dependent Claim
27 words
A method in accordance with claim 1 further comprising a step of: controlling exhaust gas recirculation of the internal combustion engine dependent on the combustion variability signal.
Claim 14
Independent Claim
79 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring crankshaft acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; measuring engine load; providing the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load; and controlling an amount of fuel provided to the internal combustion engine dependent on the combustion variability signal.
Claim 15
Independent Claim
79 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring crankshaft acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; measuring engine load; providing the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load; and controlling an amount of fuel provided to the internal combustion engine dependent on the combustion variability signal.
Claim 16
Independent Claim
85 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; measuring engine load; providing the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load; and controlling an amount of fuel provided to the internal combustion engine by reducing fuel flow until the combustion variability signal exceeds a preset limit.
Claim 17
Independent Claim
85 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; measuring engine load; providing the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load; and controlling an amount of fuel provided to the internal combustion engine by reducing fuel flow until the combustion variability signal exceeds a preset limit.
Claim 18
Independent Claim
77 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring crankshaft acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; measuring engine load; providing the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load; and controlling exhaust gas recirculation of the internal combustion engine dependent on the combustion variability signal.
Claim 19
Independent Claim
77 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring crankshaft acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; measuring engine load; providing the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load; and controlling exhaust gas recirculation of the internal combustion engine dependent on the combustion variability signal.
Claim 20
Independent Claim
85 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; measuring engine load; providing the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load; and increasing exhaust gas recirculation of the internal combustion engine dependent on the combustion variability signal until the combustion variability signal exceeds a preset limit.
Claim 21
Independent Claim
85 words
A method of combustion control for an internal combustion engine proximate an extinction limit comprising the steps of: measuring acceleration behavior of the internal combustion engine, and providing a raw acceleration signal dependent thereon; measuring engine load; providing the combustion variability signal dependent on a standard deviation of the raw acceleration signal and normalized dependent on the measured engine load; and increasing exhaust gas recirculation of the internal combustion engine dependent on the combustion variability signal until the combustion variability signal exceeds a preset limit.
Claim 22
Dependent Claim
32 words
A method in accordance with claim 12 further comprising a step of: controlling the internal combustion engine comprises controlling ignition timing of the internal combustion engine dependent on the combustion variability signal.
Claim 23
Dependent Claim
36 words
A method in accordance with claim 13 wherein the step of ignition timing of the internal combustion engine comprises advancing ignition timing of the internal combustion engine after the combustion variability signal exceeds the preset limit.
References Cited (Backward Citations)
US3872846A
Cited
US4002155A
Cited
US5237504A
Cited
US5353634A
Cited
US5313826A
Cited
US5333585A
Cited
US5237862A
Cited
US5515720A
Cited
US5528931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-07 | 2002-03-09 | 2002-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-07 | 2006-03-09 | 2006-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-07 | 2010-03-09 | 2010-09-08 | $7700.00 | Window Closed / Lapsed |