US6422007B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system
Assignee: Faurecia Emissions Control Technologies USA LLC
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Filing: 1999-05-17
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Granted: 2002-07-23
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Expires: 2019-05-17
Abstract
Abstract An exhaust system or an engine ( 12 ) includes a lean NOx catalytic device ( 18 ), and a heat exchanger ( 70 ) positioned upstream of the catalytic device ( 18 ). Control means ( 44, 46 ) controls a valve ( 36 ) to regulate exhaust gas flow through the heat exchanger ( 70 ) or along a bypass path ( 26 ). The heat exchanger ( 70 ) can cool the exhaust gases to ensure that the maximum operating temperature of the catalytic device ( 1 ) is not exceeded. During use, the heat exchanger ( 70 ) can be bypassed to allow high temperature purge cycles.
Inventors
- 👤 Johannes Hartick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:39
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2046; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9422; B01D53/9431; F01N13/00; F01N13/009; F01N3/02; F01N3/04; F01N3/043; F01N3/05; F01N3/0807; F01N3/0814; F01N3/0828; F01N3/0842; F01N3/0871; F01N3/0885; F01N3/24; F01N3/28; F01N3/2882; F01N9/00; F01N9/005; B01D2258/00; B01D2258/01; B01D2258/012; F01N1/00; F01N2240/00; F01N2240/02; F01N2260/00; F01N2260/06; F01N2410/00; F01N2570/00; F01N2570/04; F01N2570/14; F01N3/2889; F02; F02D; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0414; F02D41/00; F02D41/02; F02D41/021; F02D41/0235; F02D41/027; F02D41/0275; F02D41/028; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1446; F02D41/1454; F02D41/18; F02D41/187; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
An exhaust system for an internal combustion engine defining a gas flow path and comprising a NOx catalytic device for purifying the exhaust gases, a liquid cooled heat exchanger upstream of the NOx catalytic device, and a flow control valve, the gas flow path including a cooling gas flow path through the heat exchanger and a bypass gas flow path, the flow control valve adapted to selectively route the flow of gas through the cooling gas flow path for cooling and the bypass gas flow path so that the gas entering the catalytic device is cooled to a desired catalytic operating temperature whereby NOx conversion efficiency is maintained.
Claim 2
Dependent Claim
108 words
An exhaust system for an internal combustion engine defining a gas flow path and comprising a NOx catalytic device for purifying the exhaust gases, a liquid cooled heat exchanger upstream of the NOx catalytic device, and a flow control valve, the gas flow path including a cooling gas flow path through the heat exchanger and a bypass gas flow path, the flow control valve adapted to selectively route the flow of gas through the cooling gas flow path for cooling and the bypass gas flow path so that the gas entering the catalytic device is cooled to a desired catalytic operating temperature whereby NOx conversion efficiency is maintained.
Claim 3
Dependent Claim
45 words
A system according to claim 1 wherein the flow control valve has an open position for routing the flow of gas substantially through the cooling gas flow path and a closed position for routing the flow of gas substantially through the bypass gas flow path.
Claim 4
Dependent Claim
15 words
A system according to claim 1 wherein the NOx catalytic device comprises a catalytic trap.
Claim 5
Dependent Claim
19 words
A system according to claim 1 wherein the bypass gas flow path is substantially outside of the heat exchanger.
Claim 6
Dependent Claim
17 words
A system according to claim 1 wherein the bypass gas flow path passes through the heat exchanger.
Claim 7
Dependent Claim
52 words
A system according to claim 5 wherein the heat exchanger defines the cooling gas flow path and the bypass gas flow path and includes a coolant medium, the coolant medium having substantially more thermal contact with gas in the cooling gas flow path than with gas in the bypass gas flow path.
Claim 8
Dependent Claim
53 words
A system according to claim 6 wherein the flow control valve is located in the cooling gas flow path, the cooling gas flow path having a flow resistance not significantly less than the bypath gas flow path to promote gas flow through the cooling gas flow path when the control valve is open.
Claim 9
Dependent Claim
17 words
The system according to claim 1 further comprising a second catalytic device upstream of the heat exchanger.
Claim 10
Dependent Claim
17 words
The system according to claim 8 wherein the second heat catalytic device comprises a light-off catalytic converter.
Claim 11
Dependent Claim
31 words
The system according to claim 1 wherein the heat exchanger comprises a coolant inlet port and a coolant outlet port for enabling coolant to be circulated through the heat exchanger unit.
Claim 12
Dependent Claim
28 words
The system according to claim 10 further comprising a coolant circuit coupled to the inlet and outlet ports, and a radiator for cooling the coolant in the circuit.
Claim 13
Dependent Claim
39 words
A system according to claim 1 wherein the NOx catalytic device comprises an electronic circuit operable to control the cooling of the exhaust gases in dependence on at least one of the characteristic indicative of the exhaust gas temperature.
Claim 14
Dependent Claim
32 words
A system according to claim 12 further comprising at least one sensor for measuring said at least one characteristic and for producing electronic signals representative of said measured at least one characteristic.
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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) | 2005-07-22 | 2006-01-21 | 2006-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-07-22 | 2010-01-21 | 2010-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-07-22 | 2014-01-21 | 2014-07-23 | $7700.00 | Window Closed / Lapsed |