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US6581571B2
Expired / Lapsed
US
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Engine control to reduce emissions variability
Assignee: Deere and Co
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Filing: 2001-06-12
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Granted: 2003-06-24
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Expires: 2021-06-12
Abstract
Abstract A system and method of controlling an engine includes sensing a concentration of NOx in exhaust gases produced by the engine and generating a sensed NOx value representative thereof, and controlling an engine control set point as a function of the sensed NOx value. The system also calculates a NOx difference value by subtracting a base NOx value from the sensed NOx value, and if an absolute value of the difference value exceeds a threshold, modifying the set point as a function of the NOx difference value. The method also includes sensing engine RPM, sensing engine manifold absolute pressure (MAP), determining the NOx value as a function of sensed engine RPM and MAP.
Inventors
- 👤 John Thomas Kubesh
- 👤 Daniel James Podnar
- 👤 John Phillip Latusek
- 👤 Donald Lee McCaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:27
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02D; F02D43/00; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/146; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0418; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A method of controlling an engine to reduce variability of engine exhaust emissions, comprising: sensing a concentration of oxide of nitrogen (NOx) in exhaust gases produced by the engine with a single NOx sensor which has an output which is substantially proportional to concentration of NOx in said exhaust gases, and generating a sensed NOx value representative thereof; generating a base NOx value; calculating an NOx difference value by subtracting the base NOx value from the sensed NOx value; and modifying an engine control system set point as a function of the NOx difference value in order to reduce an amount of NOx in the engine exhaust.
Claim 2
Independent Claim
107 words
A method of controlling an engine to reduce variability of engine exhaust emissions, comprising: sensing a concentration of oxide of nitrogen (NOx) in exhaust gases produced by the engine with a single NOx sensor which has an output which is substantially proportional to concentration of NOx in said exhaust gases, and generating a sensed NOx value representative thereof; generating a base NOx value; calculating an NOx difference value by subtracting the base NOx value from the sensed NOx value; and modifying an engine control system set point as a function of the NOx difference value in order to reduce an amount of NOx in the engine exhaust.
Claim 3
Dependent Claim
16 words
The method of claim 1 , wherein: the engine control system set points comprises spark timing.
Claim 4
Dependent Claim
32 words
The method of claim 1 , further comprising: sensing engine RPM; sensing engine manifold air pressure (MAP); and determining the base NOx value as a function of sensed engine RPM and MAP.
Claim 5
Dependent Claim
33 words
The method of claim 1 , further comprising: sensing engine RPM; calculating an engine air flow value; and determining the base NOx value as a function of sensed engine RPM and calculated airflow.
Claim 6
Dependent Claim
27 words
The method of claim 1 , further comprising: sensing humidity in engine intake air; and correcting the base NOx value as a function of the sensed humidity.
Claim 7
Dependent Claim
43 words
The method of claim 1 , further comprising: if an absolute value of the difference value exceeds a threshold, modifying the set point as a function of the NOx difference value in order to reduce an amount of NOx in the engine exhaust.
Claim 8
Dependent Claim
27 words
The method of claim 6 , further comprising: sensing humidity in engine intake air; and correcting the base NOx value as a function of the sensed humidity.
Claim 9
Independent Claim
102 words
A system for controlling an engine to reduce variability of engine exhaust emissions, comprising: a single NOx concentration sensor in an exhaust of the engine generating a sensed NOx value representative thereof, NOx sensor having an output which is substantially proportional to concentration of NOx in said exhaust gases; and a control unit which generates a base NOx value, calculates a NOx difference value by subtracting the base NOx value from the sensed NOx value, and modifies an engine control system set point as a function of the NOx difference value in order to reduce variability of NOx in the engine exhaust.
Claim 10
Independent Claim
102 words
A system for controlling an engine to reduce variability of engine exhaust emissions, comprising: a single NOx concentration sensor in an exhaust of the engine generating a sensed NOx value representative thereof, NOx sensor having an output which is substantially proportional to concentration of NOx in said exhaust gases; and a control unit which generates a base NOx value, calculates a NOx difference value by subtracting the base NOx value from the sensed NOx value, and modifies an engine control system set point as a function of the NOx difference value in order to reduce variability of NOx in the engine exhaust.
Claim 11
Dependent Claim
38 words
The control system of claim 8 , further comprising: an engine RPM sensor; an engine manifold air pressure (MAP) sensor; and the control unit determining the base NOx value as a function of sensed engine RPM and MAP.
Claim 12
Dependent Claim
38 words
The control system of claim 8 , further comprising: an engine RPM sensor; an engine manifold air pressure (MAP) sensor; and the control unit determining the base NOx value as a function of sensed engine RPM and MAP.
Claim 13
Dependent Claim
35 words
The control system of claim 8 , further comprising: a humidity sensor for sensing humidity in engine intake air; and the control unit correcting the base NOx value as a function of the sensed humidity.
Claim 14
Dependent Claim
45 words
The method of claim 8 , wherein: the control unit, if an absolute value of the NOx difference value exceeds a threshold, modifies the set point as a function of the NOx difference value in order to reduce variability of NOx in the engine exhaust.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2006-06-23 | 2006-12-23 | 2007-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-06-23 | 2010-12-23 | 2011-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-06-23 | 2014-12-23 | 2015-06-24 | $7700.00 | Window Closed / Lapsed |