Patent US3195050A successfully refreshed from Google Patents.
US6435166B1
Expired / Lapsed
US
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Exhaust gas recirculation device and control method thereof
Assignee: Komatsu Ltd
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Filing: 2000-06-14
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Granted: 2002-08-20
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Expires: 2020-06-14
Abstract
Abstract A Roots blower driven by a direct-current motor provided to a recirculation duct for connecting an exhaust duct and an intake duct to extract a part of exhaust gas of a diesel engine to recirculate to an intake side. Accordingly, even when a differential pressure between an exhaust side and the intake side, or even when a pressure on the intake side is higher than the exhaust side fluctuates, the exhaust gas flowing to the recirculation duct can be forcibly pumped by the Roots blower while appropriately controlling flow rate thereof, so that an optimum recirculation amount of exhaust gas in accordance with operation condition of the diesel engine can be recirculated to the intake side.
Inventors
- 👤 Fumihide Sato
- 👤 Kunihiko Komiyama
- 👤 Yasuyuki Onodera
- 👤 Yoshiki Kanzaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:06
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/05; F02M26/07; F02M26/13; F02M26/22; F02M26/23; F02M26/28; F02M26/34; F02M26/36; F02M26/50; F02B; F02B3/00; F02B3/06; F02M26/33; F02M26/45; F02M26/46; F02M26/47
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
An exhaust gas recirculation device for extracting a part of an exhaust gas of an internal combustion engine and recirculating the exhaust gas into an intake side, comprising a gas feeder capable of rotating in both normal and reverse directions installed in a recirculation duct connecting an exhaust duct and an intake duct of the internal combustion engine.
Claim 2
Dependent Claim
58 words
An exhaust gas recirculation device for extracting a part of an exhaust gas of an internal combustion engine and recirculating the exhaust gas into an intake side, comprising a gas feeder capable of rotating in both normal and reverse directions installed in a recirculation duct connecting an exhaust duct and an intake duct of the internal combustion engine.
Claim 3
Dependent Claim
42 words
The exhaust gas recirculation device according to claim 1 , further comprising an air mixer between the gas feeder and an exhaust side of the internal combustion engine for mixing outside fresh air with the exhaust gas recirculating to the intake side.
Claim 4
Dependent Claim
40 words
The exhaust gas recirculation device according to claim 1 , further comprising a water mixer between the gas feeder and an exhaust side of the internal combustion engine for mixing water with the exhaust gas recirculating to the intake side.
Claim 5
Dependent Claim
37 words
The exhaust gas recirculation device according to claim 1 , further comprising a cooler between the gas feeder and an exhaust side of the internal combustion engine for cooling the exhaust gas recirculating to the intake side.
Claim 6
Dependent Claim
30 words
The exhaust gas recirculation device according to claim 4 , wherein the gas feeder, a drive source for driving the gas feeder and the cooler are integrated as a unit.
Claim 7
Dependent Claim
81 words
The exhaust gas recirculation device according to claim 1 , wherein a rotation of the gas feeder in the normal direction circulates fluid in reverse to a rotation of the reverse direction, and wherein a controller for controlling the gas feeder is provided, the controller controlling rotary direction of the gas feeder in accordance with an operation condition of the internal combustion engine and reversely rotating the gas feeder when the exhaust gas is not recirculated to the internal combustion engine.
Claim 8
Dependent Claim
18 words
The exhaust gas recirculation device according to claim 1 , wherein the gas feeder is a Roots blower.
Claim 9
Dependent Claim
47 words
The exhaust gas recirculation device according to claim 1 , wherein a catalyst for cleaning exhaust gas is provided to the exhaust duct of the internal combustion engine, and wherein the part of the exhaust gas is extracted from a downstream of the catalyst to be recirculated.
Claim 10
Dependent Claim
132 words
The exhaust gas recirculation device according to claim 1 , wherein the gas feeder is capable of adjusting-air feed flow rate, and wherein the exhaust gas recirculation device has an engine speed detector for detecting an engine speed of the internal combustion engine, a fuel supply detector for detecting fuel supply to the internal combustion engine, a memory for storing a map indicating a rotation speed of the gas feeder capable of obtaining an optimum exhaust gas recirculation amount in accordance with the engine speed of the internal combustion engine and the fuel supply to the internal combustion engine, and a controller for adjusting the air feed flow rate of the gas feeder based on the map stored in the memory in accordance with an operation condition of the internal combustion engine.
Claim 11
Dependent Claim
122 words
A control method of an exhaust gas recirculation device for extracting a part of exhaust gas of an internal combustion engine to recirculate to an intake side, comprising the steps of: providing to the exhaust gas recirculation device a gas feeder capable of rotating in both normal and reverse directions installed in a recirculation duct for connecting an exhaust duct and an intake duct of the internal combustion engine and a drive source for driving the gas feeder, the gas feeder controlling a rotation speed of the drive source to control air feed flow rate; and controlling a rotation speed of the drive source to obtain an optimum exhaust gas recirculation amount in accordance with operation condition of the internal combustion engine.
Claim 12
Dependent Claim
122 words
A control method of an exhaust gas recirculation device for extracting a part of exhaust gas of an internal combustion engine to recirculate to an intake side, comprising the steps of: providing to the exhaust gas recirculation device a gas feeder capable of rotating in both normal and reverse directions installed in a recirculation duct for connecting an exhaust duct and an intake duct of the internal combustion engine and a drive source for driving the gas feeder, the gas feeder controlling a rotation speed of the drive source to control air feed flow rate; and controlling a rotation speed of the drive source to obtain an optimum exhaust gas recirculation amount in accordance with operation condition of the internal combustion engine.
Claim 13
Dependent Claim
129 words
A control method of an exhaust gas recirculation device for extracting a part of exhaust gas of an internal combustion engine to recirculate to an intake side, comprising the steps of: providing to the exhaust gas recirculation device with a gas feeder installed to a recirculation duct for connecting an exhaust duct and an intake duct of the internal combustion engine and a drive source for driving the gas feeder, the gas feeder being capable of rotating in both normal and reverse directions, rotation in the reverse direction circulating fluid in a direction reverse to rotation in the normal direction; and reversely rotating the gas feeder to prevent backflow from the intake side to the exhaust side when the exhaust gas is not recirculated to the internal combustion engine.
Claim 14
Dependent Claim
129 words
A control method of an exhaust gas recirculation device for extracting a part of exhaust gas of an internal combustion engine to recirculate to an intake side, comprising the steps of: providing to the exhaust gas recirculation device with a gas feeder installed to a recirculation duct for connecting an exhaust duct and an intake duct of the internal combustion engine and a drive source for driving the gas feeder, the gas feeder being capable of rotating in both normal and reverse directions, rotation in the reverse direction circulating fluid in a direction reverse to rotation in the normal direction; and reversely rotating the gas feeder to prevent backflow from the intake side to the exhaust side when the exhaust gas is not recirculated to the internal combustion engine.
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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) | 2005-08-19 | 2006-02-18 | 2006-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-08-19 | 2010-02-18 | 2010-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-08-19 | 2014-02-18 | 2014-08-20 | $7700.00 | Window Closed / Lapsed |