Patent US5771867A successfully refreshed from Google Patents.
US5771867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for exhaust gas recovery system in an internal combustion engine
Assignee: Caterpillar Inc
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Filing: 1997-07-03
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Granted: 1998-06-30
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Expires: 2017-07-03
Abstract
Abstract A system and method for controlling an exhaust gas recirculation system in an internal combustion engine having two or more actuating devices on a supercharger-type pressure-charged internal combustion engine, or, in a turbocharger equipped pressure-charged internal combustion engine. In the disclosed embodiments, the actuating devices may include a variable gas pocket valve, an air intake throttle valve, an exhaust gas recirculation valve, a turbocharger back pressure valve, or the adjustable turbine blades in a variable gas turbine. In the disclosed embodiments, the control system includes a pair of actuators operatively coupled to an engine controller. The second actuator is operatively responsive to the first actuator when the first actuator command signal exceeds prescribed actuator limits. However, when the first actuator is commanded or operating within the prescribed actuator limits, the variance or feedback signal is zero and the second actuator operates more or less independently of the first actuator.
Inventors
- 👤 Alois Amstutz
- 👤 James J. Faletti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:55
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0052; F02B; F02B33/00; F02B33/32; F02B33/42; F02B37/00; F02B37/12; F02B37/18; F02B37/22; F02B37/225; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/25; F02M26/02; F02M26/04; F02M26/05; F02M26/33; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
206 words
A closed loop control system for an exhaust gas recirculation system having two or more actuating devices, said control system comprising: an engine controller adapted for receiving two or more engine operating parameter inputs and providing two or more actuator control output signals; a first actuator coupled to said engine controller and having an input for receiving a first actuator control output signal from said engine controller, said first actuator further connected to a first actuating device of said exhaust gas recirculation system and adapted for controlling said first actuating device in response to said first actuator control output signal; a second actuator coupled to said engine controller and having an input for receiving a second actuator control output signal from said engine controller, said second actuator further connected to a second actuating device of said exhaust gas recirculation system and adapted for controlling said second actuating device in response to said second actuator control output signal; and a feedback loop operatively coupling said control signals associated with said first actuator with said second actuator, and wherein said engine controller is adapted to generate said second actuator control output signal based on said engine operating parameter inputs and said control signals associated with said first actuator.
Claim 2
Dependent Claim
206 words
A closed loop control system for an exhaust gas recirculation system having two or more actuating devices, said control system comprising: an engine controller adapted for receiving two or more engine operating parameter inputs and providing two or more actuator control output signals; a first actuator coupled to said engine controller and having an input for receiving a first actuator control output signal from said engine controller, said first actuator further connected to a first actuating device of said exhaust gas recirculation system and adapted for controlling said first actuating device in response to said first actuator control output signal; a second actuator coupled to said engine controller and having an input for receiving a second actuator control output signal from said engine controller, said second actuator further connected to a second actuating device of said exhaust gas recirculation system and adapted for controlling said second actuating device in response to said second actuator control output signal; and a feedback loop operatively coupling said control signals associated with said first actuator with said second actuator, and wherein said engine controller is adapted to generate said second actuator control output signal based on said engine operating parameter inputs and said control signals associated with said first actuator.
Claim 3
Dependent Claim
19 words
The closed loop control system of claim 1 wherein said first actuating device is a variable gas pocket valve.
Claim 4
Dependent Claim
19 words
The closed loop control system of claim 2 wherein said second actuating device is an air intake throttle valve.
Claim 5
Dependent Claim
19 words
The closed loop control system of claim 1 wherein said first actuating device is an exhaust gas recirculation valve.
Claim 6
Dependent Claim
19 words
The closed loop control system of claim 4 wherein said second actuating device is an air intake throttle valve.
Claim 7
Dependent Claim
19 words
The closed loop control system of claim 4 wherein said second actuating device is a turbocharger back pressure valve.
Claim 8
Dependent Claim
18 words
The closed loop control system of claim 4 wherein said second actuating device is a variable gas turbine.
Claim 9
Dependent Claim
38 words
The closed loop control system of claim 1 wherein said engine controller includes a processor and wherein said processor is adapted for generating a feed forward command for said first actuator based on said engine operating parameter inputs.
Claim 10
Dependent Claim
33 words
The closed loop control system of claim 8 wherein said processor is further adapted for generating a first actuator command signal based on said feed forward command and said engine operating parameter inputs.
Claim 11
Dependent Claim
49 words
The closed loop control system of claim 9 wherein said processor is further adapted for generating prescribed actuator limits based on said engine operating parameter inputs, and wherein said prescribed actuator limits are used to adjust said first actuator command signal to yield said first actuator control output signal.
Claim 12
Dependent Claim
31 words
The closed loop control system of claim 9 wherein said processor is further adapted for determining a variance between said first actuator command signal and said first actuator control output signal.
Claim 13
Dependent Claim
39 words
The closed loop control system of claim 11 wherein said processor is further adapted for generating said second actuator control output signal based on said variance between said first actuator command signal and said first actuator control output signal.
Claim 14
Dependent Claim
31 words
The closed loop control system of claim 12 wherein said processor is further adapted for generating a feed forward command for said second actuator based on said engine operating parameter inputs.
Claim 15
Dependent Claim
48 words
The closed loop control system of claim 13 wherein said processor is further adapted for generating said second actuator control output signal based on said variance between said first actuator command signal and said first actuator control output signal and said feed forward command for said second actuator.
Claim 16
Dependent Claim
50 words
The closed loop control system of claim 12 wherein said processor is further adapted for generating prescribed actuator limits for said second actuator based on said engine operating parameter inputs, and wherein said prescribed actuator limits for said second actuator are used to adjust said second actuator control output signal.
Claim 17
Independent Claim
154 words
A method of controlling an exhaust gas recirculation system having two or more cooperatively controlled actuating devices, said method comprising the steps of: receiving two or more engine operating parameter inputs producing a first actuator command signal in response to said engine operating parameter inputs; producing a first actuator control output signal in response to said first actuator command signal and one or more first actuator signal limits wherein said first actuator signal limits are determined based on said engine operating parameter inputs; controlling a first actuator in response to said first actuator control output signal; producing a first actuator control variance signal through the comparison of said first actuator control signal and said first actuator command signal; producing a second actuator control output signal in response to said first actuator control variance signal and said engine operating parameter inputs; and controlling a second actuator in response to said second actuator control output signal.
Claim 18
Independent Claim
154 words
A method of controlling an exhaust gas recirculation system having two or more cooperatively controlled actuating devices, said method comprising the steps of: receiving two or more engine operating parameter inputs producing a first actuator command signal in response to said engine operating parameter inputs; producing a first actuator control output signal in response to said first actuator command signal and one or more first actuator signal limits wherein said first actuator signal limits are determined based on said engine operating parameter inputs; controlling a first actuator in response to said first actuator control output signal; producing a first actuator control variance signal through the comparison of said first actuator control signal and said first actuator command signal; producing a second actuator control output signal in response to said first actuator control variance signal and said engine operating parameter inputs; and controlling a second actuator in response to said second actuator control output signal.
Claim 19
Dependent Claim
26 words
The method of controlling an exhaust gas recirculation system as set forth in claim 16 wherein said first actuating device is a variable gas pocket valve.
Claim 20
Dependent Claim
26 words
The method of controlling an exhaust gas recirculation system as set forth in claim 17 wherein said second actuating device is an intake air throttle valve.
Claim 21
Dependent Claim
26 words
The method of controlling an exhaust gas recirculation system as set forth in claim 16 wherein said first actuating device is an exhaust gas recirculation valve.
Claim 22
Dependent Claim
26 words
The method of controlling an exhaust gas recirculation system as set forth in claim 19 wherein said second actuating device is an intake air throttle valve.
Claim 23
Dependent Claim
26 words
The method of controlling an exhaust gas recirculation system as set forth in claim 19 wherein said second actuating device is a turbocharger back pressure valve.
Claim 24
Dependent Claim
25 words
The method of controlling an exhaust gas recirculation system as set forth in claim 19 wherein said second actuating device is a variable gas turbine.
Claim 25
Dependent Claim
70 words
The method of controlling an exhaust gas recirculation system as set forth in claim 16 further comprising the step of determining a first actuator feed forward command signal based on said engine operating parameter inputs and wherein said step of producing said first actuator command signal further comprises producing said first actuator command signal in response to said engine operating parameter inputs and said first actuator feed forward command signal.
Claim 26
Dependent Claim
76 words
The method of controlling an exhaust gas recirculation system as set forth in claim 16 further comprising the step of determining a second actuator feed forward command signal based on said engine operating parameter inputs and wherein said step of producing said second actuator control output signal further comprises the step of producing said second actuator control output signal in response to said first actuator control variance signal and said second actuator feed forward command signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-29 | 2001-12-29 | 2002-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-29 | 2005-12-29 | 2006-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-29 | 2009-12-29 | 2010-06-30 | $7700.00 | Window Closed / Lapsed |