US6205775B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation control system
Assignee: Caterpillar Inc
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Filing: 1999-03-22
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Granted: 2001-03-27
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Expires: 2019-03-22
Abstract
Abstract Past exhaust emission control systems fail to utilize exhaust gas recirculation during all operating parameters of an engine. The present exhaust gas recirculation system reduces the emissions emitted from an engine during all operating parameters of the engine. The engine includes a cylinder, a rotatable crankshaft and a turbocharger defining a compressor section compressing a flow of intake air to a first preestablished pressure and being driven by a flow of exhaust gas having a first preestablished pressure. The exhaust gas recirculation system is comprised of a portion of the flow of exhaust gas being recirculated to the cylinder and forming a flow of recirculated exhaust gas. The flow of recirculated exhaust gas is cooled. The flow of recirculated exhaust gas is compressed to a second preestablished pressure being at least equal to the first preestablished pressure of the intake air. And, a quantity of the flow of recirculated exhaust gas is controlled depending on the operating parameter of the engine.
Inventors
- 👤 Gerald N. Coleman
- 👤 Keith E. Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:44
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02B; F02B29/00; F02B29/04; F02B29/0406; F02B29/0425; F02B29/0431; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/27; F02M26/42; F02M26/43; F02M26/44; F02M26/02; F02M26/04; F02M26/05; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
161 words
A method of reducing emissions from an engine, having a flow of intake air being at a preestablished pressure, a flow of exhaust gas being at a preestablished pressure being less than said preestablished pressure of said intake air and recirculating a portion of said flow of exhaust gas into said flow of intake air; said method of reducing exhaust emission comprising the steps of: increasing said preestablished pressure of said recirculating portion of said flow of exhaust gas to a second preestablished pressure being at least equal to said preestablished pressure of said intake air and said second preestablished pressure includes said recirculating portion being cooled and being increased by using a blower, said blower being driven at a speed being greater than a speed of said engine; monitoring an operating parameter of said engine; and controlling said recirculating portion of said flow of exhaust gas being recirculated to said intake air depending on said operating parameter of said engine.
Claim 2
Independent Claim
161 words
A method of reducing emissions from an engine, having a flow of intake air being at a preestablished pressure, a flow of exhaust gas being at a preestablished pressure being less than said preestablished pressure of said intake air and recirculating a portion of said flow of exhaust gas into said flow of intake air; said method of reducing exhaust emission comprising the steps of: increasing said preestablished pressure of said recirculating portion of said flow of exhaust gas to a second preestablished pressure being at least equal to said preestablished pressure of said intake air and said second preestablished pressure includes said recirculating portion being cooled and being increased by using a blower, said blower being driven at a speed being greater than a speed of said engine; monitoring an operating parameter of said engine; and controlling said recirculating portion of said flow of exhaust gas being recirculated to said intake air depending on said operating parameter of said engine.
Claim 3
Dependent Claim
52 words
The method of reducing emissions from an engine of claim 1 wherein said step of controlling said portion of said flow of exhaust gas being recirculated to said intake air being near a maximum quantity with said operating parameter of said engine being a high load and a low speed operating parameter.
Claim 4
Dependent Claim
52 words
The method of reducing emissions from an engine of claim 1 wherein said step of controlling said portion of said flow of exhaust gas being recirculated to said intake air being near a minimum quantity with said operating parameter of said engine being a low load and a high speed operating parameter.
Claim 5
Dependent Claim
29 words
The method of reducing emissions from an engine of claim 1 wherein said step of monitoring an operating parameter of said engine being sensing a parameter of said engine.
Claim 6
Dependent Claim
29 words
The method of reducing emissions from an engine of claim 4 wherein said step of monitoring an operating parameter of said engine being monitoring an ambient air mass flow.
Claim 7
Dependent Claim
28 words
The method of reducing emissions from an engine of claim 4 wherein said step of monitoring an operating parameter of said engine being monitoring an engine operating temperature.
Claim 8
Dependent Claim
28 words
The method of reducing emissions from an engine of claim 4 wherein said step of monitoring an operating parameter of said engine being monitoring an engine operating speed.
Claim 9
Dependent Claim
33 words
The method of reducing emissions from an engine of claim 4 wherein said step of monitoring an operating parameter of said engine being monitoring a quantity of fuel being supplied to said engine.
Claim 10
Independent Claim
147 words
A method of reducing emissions from an engine, having a flow of intake air being at a preestablished pressure, a flow of exhaust gas being at a preestablished pressure being less than said preestablished pressure of said intake air and recirculating a portion of said flow of exhaust gas into said flow of intake air; said method of reducing exhaust emission comprising the steps of: increasing said preestablished pressure of said recirculating portion of said flow of exhaust gas to a second preestablished pressure being at least equal to said preestablished pressure of said intake air using a blower being driven by said engine at a speed being greater than a speed of said engine; monitoring an operating parameter of said engine; and controlling said recirculating portion of said flow of exhaust gas being recirculated to said intake air depending on said operating parameter of said engine.
Claim 11
Independent Claim
147 words
A method of reducing emissions from an engine, having a flow of intake air being at a preestablished pressure, a flow of exhaust gas being at a preestablished pressure being less than said preestablished pressure of said intake air and recirculating a portion of said flow of exhaust gas into said flow of intake air; said method of reducing exhaust emission comprising the steps of: increasing said preestablished pressure of said recirculating portion of said flow of exhaust gas to a second preestablished pressure being at least equal to said preestablished pressure of said intake air using a blower being driven by said engine at a speed being greater than a speed of said engine; monitoring an operating parameter of said engine; and controlling said recirculating portion of said flow of exhaust gas being recirculated to said intake air depending on said operating parameter of said engine.
Claim 12
Dependent Claim
52 words
The method of reducing emissions from an engine of claim 9 wherein said step of controlling said portion of said flow of exhaust gas being recirculated to said intake air being near a maximum quantity with said operating parameter of said engine being a high load and a low speed operating parameter.
Claim 13
Dependent Claim
29 words
The method of reducing emissions from an engine of claim 9 wherein said step of monitoring an operating parameter of said engine being sensing a parameter of said engine.
Claim 14
Dependent Claim
29 words
The method of reducing emissions from an engine of claim 11 wherein said step of monitoring an operating parameter of said engine being monitoring an ambient air mass flow.
Claim 15
Dependent Claim
28 words
The method of reducing emissions from an engine of claim 11 wherein said step of monitoring an operating parameter of said engine being monitoring an engine operating speed.
Claim 16
Dependent Claim
33 words
The method of reducing emissions from an engine of claim 11 wherein said step of monitoring an operating parameter of said engine being monitoring a quantity of fuel being supplied to said engine.
Claim 17
Dependent Claim
28 words
The method of reducing emissions from an engine of claim 9 wherein said step of monitoring an operating parameter of said engine being monitoring an engine operating temperature.
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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) | 2004-03-26 | 2004-09-25 | 2005-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-03-26 | 2008-09-25 | 2009-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-03-26 | 2012-09-25 | 2013-03-27 | $7700.00 | Window Closed / Lapsed |