US6401700B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed loop diesel engine EGR control including event monitoring
Assignee: InvenSense Inc
•
Filing: 2000-12-08
•
Granted: 2002-06-11
•
Expires: 2020-12-08
Abstract
Abstract A control system and method for an EGR valve, particularly in a diesel engine. A processor processes data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open. The processing includes processing data corresponding to actual position of the valve and data representing a desired position of the valve to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal. Emission control system event monitors flag potential error sources in their incipiency to afford opportunity for correction before mandatory logging occurs.
Inventors
- 👤 Priyankar S. Balekai
- 👤 Scott Anderson
- 👤 Steven M. Bandy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:22
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/0065; F02D41/0072; F02D21/00; F02D23/00; F02D23/02; F02D41/0077; F02D41/02; F02D41/14; F02D41/1401; F02D41/22; F02D41/222; F02M; F02M26/00; F02M26/13; F02M26/17; F02M26/21; F02M26/22; F02M26/23; F02M26/33; F02M26/45; F02M26/46; F02M26/47; F02M26/48; F02M26/49; F02B; F02B2275/00; F02B2275/14; F02B29/00; F02B29/04; F02B29/0406; F02B3/00; F02B3/06; F02D2041/1409; F02D2041/141; F02D2041/1413; F02D2041/1418; F02D2041/1419; F02M26/02; F02M26/04; F02M26/07; F02M26/09; F02M26/10; F02M26/29; F02M26/30; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
137 words
A control system for a valve that controls exhaust gas recirculation in an internal combustion engine by selectively positioning a valve element that establishes the extent to which the valve is open, the control system comprising: a processor that is configured for processing data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open, including processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal.
Claim 2
Dependent Claim
137 words
A control system for a valve that controls exhaust gas recirculation in an internal combustion engine by selectively positioning a valve element that establishes the extent to which the valve is open, the control system comprising: a processor that is configured for processing data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open, including processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal.
Claim 3
Dependent Claim
80 words
A control system as set forth in claim 1 in which the processor is configured to provide an inner feedback loop and an outer feedback loop, the processor processes the data corresponding to actual position of the valve element and the data representing a desired position of the valve element in one of the feedback loops, and the processor processes the data that defines actual EGR rate and the data representing a desired EGR rate in the other feedback loop.
Claim 4
Dependent Claim
64 words
A control system as set forth in claim 2 in which the processor processes the data corresponding to actual position of the valve element and the data representing a desired position of the valve element in the inner feedback loop, and the processor processes the data that defines actual EGR rate and the data representing a desired EGR rate in the outer feedback loop.
Claim 5
Dependent Claim
24 words
A control system as set forth in claim 3 in which inner feedback loop has a faster frequency response than the outer feedback loop.
Claim 6
Dependent Claim
32 words
A control system as set forth in claim 1 in which the processor is configured for processing the position error signal through a proportional and integral control to develop the control signal.
Claim 7
Dependent Claim
32 words
A control system as set forth in claim 1 in which the processor is configured for processing the rate error signal through a proportional and integral control to develop the control signal.
Claim 8
Dependent Claim
37 words
A control system as set forth in claim 1 in which the processor is configured for processing the position error signal and the rate error signal through respective proportional and integral controls to develop the control signal.
Claim 9
Dependent Claim
28 words
A control system as set forth in claim 7 in which the processor is configured for imposing limits on the integral portion of each proportional and integral control.
Claim 10
Dependent Claim
42 words
A control system as set forth in claim 1 in which the data representing a desired EGR rate is developed by the processor processing certain data that includes data defining desired mass fuel into the engine and data defining actual engine speed.
Claim 11
Dependent Claim
50 words
A control system as set forth in claim 9 in which the processor is configured to apply a transient multiplier to the processing of the data defining desired mass fuel into the engine and the data defining actual engine speed to compensate for transients in mass fuel into the engine.
Claim 12
Dependent Claim
30 words
A control system as set forth in claim 1 in which a position sensor associated with the valve element provides the data corresponding to actual position of the valve element.
Claim 13
Dependent Claim
31 words
A control system as set forth in claim 1 in which a pulse width modulated signal corresponding to the control signal is applied to the valve to position the valve element.
Claim 14
Dependent Claim
53 words
A control system as set forth in claim 1 in which the data that defines actual EGR rate is developed by the processor processing certain data that includes data defining fresh air mass entering an intake system of the engine and pressure and temperature of air entering an intake manifold of the engine.
Claim 15
Independent Claim
130 words
A method for control of exhaust gas recirculation in an internal combustion engine by selectively positioning a valve element that establishes the extent to which an exhaust gas recirculation valve is open, the method comprising: processing data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open, including processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal.
Claim 16
Independent Claim
130 words
A method for control of exhaust gas recirculation in an internal combustion engine by selectively positioning a valve element that establishes the extent to which an exhaust gas recirculation valve is open, the method comprising: processing data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open, including processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal.
Claim 17
Dependent Claim
111 words
A method as set forth in claim 14 in which the step of processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal comprises processing the data corresponding to actual position of the valve element and the data representing a desired position of the valve element in one feedback loop, and the step of processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal comprises processing the data that defines actual EGR rate and the data representing a desired EGR rate in another feedback loop.
Claim 18
Dependent Claim
124 words
A method as set forth in claim 14 in which the step of processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal comprises processing the data corresponding to actual position of the valve element and the data representing a desired position of the valve element in an inner feedback loop, and the step of processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal comprises processing the data that defines actual EGR rate and the data representing a desired EGR rate in an outer feedback loop that has a slower frequency response than the inner feedback loop.
Claim 19
Dependent Claim
28 words
A method as set forth in claim 14 including the step of processing the position error signal through a proportional and integral control to develop the control signal.
Claim 20
Dependent Claim
28 words
A method as set forth in claim 14 including the step of processing the rate error signal through a proportional and integral control to develop the control signal.
Claim 21
Dependent Claim
36 words
A method as set forth in claim 14 including the steps of processing each of the position error signal and the rate error signal through a respective proportional and integral control to develop the control signal.
Claim 22
Dependent Claim
29 words
A method as set forth in claim 19 including the steps of imposing respective limits on respective integrations performed by integral portions of the respective proportional and integral controls.
Claim 23
Dependent Claim
36 words
A method as set forth in claim 14 in which the step of developing data representing a desired EGR rate comprises processing data defining desired mass fuel into the engine and data defining actual engine speed.
Claim 24
Dependent Claim
46 words
A method as set forth in claim 21 including the step of applying a transient multiplier to the processing of the data defining desired mass fuel into the engine and the data defining actual engine speed to compensate for transients in mass fuel into the engine.
Claim 25
Dependent Claim
47 words
A method as set forth in claim 14 in which the step of developing data that defines actual EGR rate comprises processing data defining fresh air mass entering an intake system of the engine and pressure and temperature of air entering an intake manifold of the engine.
Claim 26
Dependent Claim
116 words
An event monitoring system in an exhaust gas recirculation system of an internal combustion engine comprising an exhaust gas recirculation valve through which exhaust gas is recirculated and which comprises a valve element that is selectively positioned by a position error signal in a feedback loop of a closed loop control to establish the extent to which the valve is open, the event monitoring system comprising: a valve monitor for monitoring the time for which the magnitude of the position error signal exceeds a position error threshold and for logging the occurrence of an event when the time for which the magnitude of the position error signal exceeds the position error threshold exceeds a time threshold.
Claim 27
Dependent Claim
116 words
An event monitoring system in an exhaust gas recirculation system of an internal combustion engine comprising an exhaust gas recirculation valve through which exhaust gas is recirculated and which comprises a valve element that is selectively positioned by a position error signal in a feedback loop of a closed loop control to establish the extent to which the valve is open, the event monitoring system comprising: a valve monitor for monitoring the time for which the magnitude of the position error signal exceeds a position error threshold and for logging the occurrence of an event when the time for which the magnitude of the position error signal exceeds the position error threshold exceeds a time threshold.
Claim 28
Dependent Claim
74 words
An event monitoring system as set forth in claim 24 further including a rate monitor for monitoring the time for which the magnitude of an exhaust gas recirculation rate error signal of another feedback loop of the closed loop control exceeds a rate error threshold and for logging the occurrence of an event when the time for which the magnitude of the rate error signal exceeds the rate error threshold exceeds another time threshold.
Claim 29
Independent Claim
110 words
A method of event monitoring in an exhaust gas recirculation system of an internal combustion engine comprising an exhaust gas recirculation valve through which exhaust gas is recirculated and which comprises a valve element that is selectively positioned by a position error signal in a feedback loop of a closed loop control to establish the extent to which the valve is open, the method comprising: monitoring the time for which the magnitude of the position error signal exceeds a position error threshold and logging the occurrence of an event when the time for which the magnitude of the position error signal exceeds the position error threshold exceeds a time threshold.
Claim 30
Independent Claim
110 words
A method of event monitoring in an exhaust gas recirculation system of an internal combustion engine comprising an exhaust gas recirculation valve through which exhaust gas is recirculated and which comprises a valve element that is selectively positioned by a position error signal in a feedback loop of a closed loop control to establish the extent to which the valve is open, the method comprising: monitoring the time for which the magnitude of the position error signal exceeds a position error threshold and logging the occurrence of an event when the time for which the magnitude of the position error signal exceeds the position error threshold exceeds a time threshold.
Claim 31
Dependent Claim
70 words
A method of event monitoring as set forth in claim 26 further including monitoring the time for which the magnitude of an exhaust gas recirculation rate error signal of another feedback loop of the closed loop control exceeds a rate error threshold and logging the occurrence of an event when the time for which the magnitude of the rate error signal exceeds the rate error threshold exceeds another time threshold.
Claim 32
Dependent Claim
119 words
An event monitoring system in an exhaust gas recirculation control system of an internal combustion engine, the event monitoring system comprising: a first monitor for monitoring the time for which the magnitude of a signal used in the control system exceeds a first threshold and for logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and a second monitor for monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold.
Claim 33
Dependent Claim
119 words
An event monitoring system in an exhaust gas recirculation control system of an internal combustion engine, the event monitoring system comprising: a first monitor for monitoring the time for which the magnitude of a signal used in the control system exceeds a first threshold and for logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and a second monitor for monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold.
Claim 34
Dependent Claim
39 words
An event monitoring system as set forth in claim 28 in which the value of the first threshold is less than the value of the second threshold, and the first time limit is shorter than the second time limit.
Claim 35
Dependent Claim
39 words
An event monitoring system as set forth in claim 28 in which the signal represents a position error signal in a feedback loop of a closed loop control that establish the extent to which an exhaust gas recirculation valve.
Claim 36
Dependent Claim
20 words
An event monitoring system as set forth in claim 28 in which the signal represents an abnormality in a sensor.
Claim 37
Dependent Claim
116 words
An event monitoring system in an internal combustion engine emission control system, the event monitoring system comprising: a first monitor for monitoring the time for which the magnitude of a signal used in the emission control system exceeds a first threshold and for logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and a second monitor for monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold.
Claim 38
Dependent Claim
116 words
An event monitoring system in an internal combustion engine emission control system, the event monitoring system comprising: a first monitor for monitoring the time for which the magnitude of a signal used in the emission control system exceeds a first threshold and for logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and a second monitor for monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold.
Claim 39
Dependent Claim
32 words
An event monitoring system as set forth in claim 32 in which the signal represents an error signal in a feedback loop of a closed loop control of the emission control system.
Claim 40
Dependent Claim
25 words
An event monitoring system as set forth in claim 32 in which the signal represents an abnormality in a sensor of the emission control system.
Claim 41
Dependent Claim
105 words
An event monitoring method in an internal combustion engine emission control system, the method comprising: monitoring the time for which the magnitude of a signal used in the emission control system exceeds a first threshold and logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold.
Claim 42
Dependent Claim
105 words
An event monitoring method in an internal combustion engine emission control system, the method comprising: monitoring the time for which the magnitude of a signal used in the emission control system exceeds a first threshold and logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold.
References Cited (Backward Citations)
US4279235A
Cited
US4432331A
Cited
US4665882A
Cited
DE4322319A1
Cited
US5755094A
Cited
FR2753488A1
Cited
US5964820A
Cited
US5823164A
Cited
EP0884466A1
Cited
US6134890A
Cited
US6026790A
Cited
US6067799A
Cited
US6148616A
Cited
US6035639A
Cited
US6076353A
Cited
US6095127A
Cited
US6067800A
Cited
US6035640A
Cited
US6134889A
Cited
US6125823A
Cited
US6131539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-06-10 | 2005-12-10 | 2006-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-06-10 | 2009-12-10 | 2010-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-06-10 | 2013-12-10 | 2014-06-11 | $7700.00 | Window Closed / Lapsed |