US7322193B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation system
Assignee: Deere and Co
•
Filing: 2005-08-19
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Granted: 2008-01-29
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Expires: 2025-08-19
Abstract
Abstract An exhaust gas recirculation (EGR) system is provided for an internal combustion engine having a combustion air intake circuit, an exhaust manifold, and an exhaust circuit for communicating engine exhaust to the environment. The EGR system includes an air-to-gas EGR cooler, an air supply conduit for supplying inlet air to the EGR cooler, an EGR supply conduit for communicating exhaust from the exhaust circuit to the EGR cooler, and an EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit. The EGR system also includes a venturi unit in the exhaust circuit, and an air outlet conduit communicating heated air from the EGR cooler to the venturi unit. Flow of exhaust through the venturi creates a pressure which draws cooling air through the EGR cooler. A valve controls flow through the outlet conduit as a function of a sensed temperature in the intake circuit.
Inventors
- 👤 Christopher Adam Bering
- 👤 Richard Edward Winsor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:57
CPC Classifications
F; F02; F02B; F02B29/00; F02B29/04; F02B29/0406; F02B29/0425; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/06; F02M26/13; F02M26/14; F02M26/15; F02M26/22; F02M26/23; F02M26/27; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
An exhaust gas recirculation (EGR) system for an internal combustion engine having a combustion air intake circuit, an exhaust manifold, a turbocharger unit having an exhaust turbine and an inlet air compressor, and an exhaust circuit for communicating engine exhaust to the environment, the EGR system comprising: an air-to-gas EGR cooler; an air supply conduit for supplying inlet air to the EGR cooler; an EGR supply conduit for communicating exhaust from the exhaust circuit to the EGR cooler; an EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit upstream of the compressor; a venturi unit in the exhaust circuit; and an air outlet conduit communicating heated air from the EGR cooler to the venturi unit, flow of exhaust through the exhaust line and the venturi creating a pressure which draws cooling air through the EGR cooler.
Claim 2
Dependent Claim
141 words
An exhaust gas recirculation (EGR) system for an internal combustion engine having a combustion air intake circuit, an exhaust manifold, a turbocharger unit having an exhaust turbine and an inlet air compressor, and an exhaust circuit for communicating engine exhaust to the environment, the EGR system comprising: an air-to-gas EGR cooler; an air supply conduit for supplying inlet air to the EGR cooler; an EGR supply conduit for communicating exhaust from the exhaust circuit to the EGR cooler; an EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit upstream of the compressor; a venturi unit in the exhaust circuit; and an air outlet conduit communicating heated air from the EGR cooler to the venturi unit, flow of exhaust through the exhaust line and the venturi creating a pressure which draws cooling air through the EGR cooler.
Claim 3
Dependent Claim
30 words
The EGR system of claim 1 , further comprising: a bypass line communicating ambient air to the air outlet conduit; and a bypass valve controlling flow through the bypass line.
Claim 4
Dependent Claim
32 words
The EGR system of claim 2 , further comprising: a parameter sensor in the intake circuit; and a control unit for controlling the bypass valve as a function of the sensed parameter.
Claim 5
Dependent Claim
15 words
The EGR system of claim 3 , wherein: the parameter sensor comprises a temperature sensor.
Claim 6
Dependent Claim
55 words
The EGR system of claim 2 , further comprising: a compressor outlet line communicating a mixture of air and exhaust from the compressor to the combustion air intake; a temperature sensor in the compressor outlet line; and a control unit for controlling the bypass valve as a function of the temperature sensed by the sensor.
Claim 7
Dependent Claim
39 words
The EGR system of claim 2 , further comprising: charge air cooler; a temperature sensor in the EGR conduit; and a control unit for controlling the bypass valve as a function of the temperature sensed by the temperature sensor.
Claim 8
Dependent Claim
18 words
The EGR system of claim 6 , wherein: the temperature sensor is upstream of the charge air cooler.
Claim 9
Dependent Claim
194 words
An exhaust gas recirculation (EGR) system for an internal combustion engine having a combustion air intake circuit, an exhaust manifold, and an exhaust circuit for communicating engine exhaust to the environment, the EGR system comprising: an air-to-gas EGR cooler; an air supply conduit for supplying inlet air to the EGR cooler; an EGR supply conduit for communicating exhaust from the exhaust circuit to the EGR cooler; an EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit; a venturi unit in the exhaust circuit; an air outlet conduit communicating heated air from the EGR cooler to the venturi unit, flow of exhaust through the venturi creating a pressure which draws cooling air through the EGR cooler; a bypass line communicating ambient air to the air outlet conduit; a bypass valve controlling flow through the bypass line; a parameter sensor in the intake circuit; a control unit for controlling the bypass valve as a function of the sensed parameter; and a turbocharger unit having an exhaust turbine and an inlet air compressor, the EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit upstream of the compressor.
Claim 10
Dependent Claim
194 words
An exhaust gas recirculation (EGR) system for an internal combustion engine having a combustion air intake circuit, an exhaust manifold, and an exhaust circuit for communicating engine exhaust to the environment, the EGR system comprising: an air-to-gas EGR cooler; an air supply conduit for supplying inlet air to the EGR cooler; an EGR supply conduit for communicating exhaust from the exhaust circuit to the EGR cooler; an EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit; a venturi unit in the exhaust circuit; an air outlet conduit communicating heated air from the EGR cooler to the venturi unit, flow of exhaust through the venturi creating a pressure which draws cooling air through the EGR cooler; a bypass line communicating ambient air to the air outlet conduit; a bypass valve controlling flow through the bypass line; a parameter sensor in the intake circuit; a control unit for controlling the bypass valve as a function of the sensed parameter; and a turbocharger unit having an exhaust turbine and an inlet air compressor, the EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit upstream of the compressor.
Claim 11
Dependent Claim
192 words
An exhaust gas recirculation (EGR) system for an internal combustion engine having a combustion air intake circuit, an exhaust manifold, and an exhaust circuit for communicating engine exhaust to the environment, the EGR system comprising: an air-to-gas EGR cooler; an air supply conduit for supplying inlet air to the EGR cooler; an EGR supply conduit for communicating exhaust from the exhaust circuit to the EGR cooler; an EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit; a venturi unit in the exhaust circuit; an air outlet conduit communicating heated air from the EGR cooler to the venturi unit, flow of exhaust through the venturi creating a pressure which draws cooling air through the EGR cooler; a bypass line communicating ambient air to the air outlet conduit; a bypass valve controlling flow through the bypass line; a parameter sensor in the intake circuit; and a control unit for controlling the bypass valve as a function of the sensed parameter, the engine including a turbocharger unit having an exhaust turbine and an inlet air compressor, and the EGR supply conduit communicating with the exhaust circuit downstream of the turbine.
Claim 12
Dependent Claim
192 words
An exhaust gas recirculation (EGR) system for an internal combustion engine having a combustion air intake circuit, an exhaust manifold, and an exhaust circuit for communicating engine exhaust to the environment, the EGR system comprising: an air-to-gas EGR cooler; an air supply conduit for supplying inlet air to the EGR cooler; an EGR supply conduit for communicating exhaust from the exhaust circuit to the EGR cooler; an EGR outlet conduit communicating cooled EGR from the EGR cooler to the intake circuit; a venturi unit in the exhaust circuit; an air outlet conduit communicating heated air from the EGR cooler to the venturi unit, flow of exhaust through the venturi creating a pressure which draws cooling air through the EGR cooler; a bypass line communicating ambient air to the air outlet conduit; a bypass valve controlling flow through the bypass line; a parameter sensor in the intake circuit; and a control unit for controlling the bypass valve as a function of the sensed parameter, the engine including a turbocharger unit having an exhaust turbine and an inlet air compressor, and the EGR supply conduit communicating with the exhaust circuit downstream of the turbine.
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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) | 2011-01-28 | 2011-07-30 | 2012-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2015-01-28 | 2015-07-30 | 2016-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2019-01-28 | 2019-07-30 | 2020-01-29 | $7700.00 | Window Closed / Lapsed |