US3747346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature control system for catalytic converter
Assignee: Nissan Motor Co Ltd
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Filing: 1972-04-17
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Granted: 1973-07-24
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Expires: 1992-04-17
Abstract
Abstract A system for controlling the catalyst temperature of a catalytic converter mounted in an exhaust system of an internal combustion engine within a range appropriate for eliminating nitrogen oxides contained in engine exhaust gases. The system includes an encasing structure which is disposed about an exhaust pipe upstream of the catalytic converter and which is spaced from the exhaust pipe to form a gap into which an atmospheric air is selectively admitted. The encasing structure has air inlet and outlet passages communicating with the gap and opening to the atmosphere. The flow of atmospheric air into the gap is controlled by first and second valve plates operatively disposed in the air inlet and outlet passages respectively, the first and second valve plates being controlled by a control means comprising a diaphragm unit communicating with an intake manifold of the engine, a solenoid valve for controlling the fluid communication between the diaphragm unit and the intake manifold, and a temperature sensitive switch responsive to the catalyst temperature for controlling the solenoid valve.
Inventors
- 👤 M Onoda
- 👤 T Simizume
- 👤 M Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:57
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2046; F01N3/02; F01N3/05; F01N2240/00; F01N2240/02; F01N2260/00; F01N2260/02; F01N2260/022; F01N2390/00; F01N2390/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
333 words
A control system for use with an exhaust system of an internal combustion engine having an intake manifold, an exhaust manifold and an exhaust pipe leading from said exhaust manifold and adapted for controlling the temperature of a catalyst contained in a catalytic converter mounted in said exhaust pipe, said control system comprising an encasing structure disposed about said exhaust pipe upstream of said catalytic converter and spaced from said exhaust pipe to form a gap between said encasing structure and said exhaust pipe, an air inlet passage formed at an upstream side of said encasing structure, an air outlet passage formed at a downstream side of said encasing structure, said air inlet and outlet passages opening to the atmosphere and communicating with said gap formed between said exhaust pipe and said encasing structure, first and second valve plates operatively disposed in said air inlet and outlet passages respectively and mechanically connected to each other, diaphragm means linked to said first valve plate for actuating the same, first and second conduit means for connecting said diaphragm means to said intake manifold, a source of electric power supply, solenoid valve means interposed between said first and second conduit means and connected to said source of electric power supply for controlling the fluid communication between said first and second conduit means, and temperature sensitive switch means located between said source of electric power supply and said solenoid valve means and communicating with said catalytic converter, said temperature sensitive switch means being responsive to the temperature of said catalyst in said catalytic converter, whereby, when the catalyst temperature exceeds a predetermined value, said temperature sensitive switch means is switched on to energize said solenoid valve means to provide the fluid communication between said first and second conduit means thereby to cause said diaphragm means to move said first and second valve plates in their open position to admit the atmospheric air into said gap for thereby maintaining the temperature of said catalyst within a certain range.
Claim 2
Dependent Claim
333 words
A control system for use with an exhaust system of an internal combustion engine having an intake manifold, an exhaust manifold and an exhaust pipe leading from said exhaust manifold and adapted for controlling the temperature of a catalyst contained in a catalytic converter mounted in said exhaust pipe, said control system comprising an encasing structure disposed about said exhaust pipe upstream of said catalytic converter and spaced from said exhaust pipe to form a gap between said encasing structure and said exhaust pipe, an air inlet passage formed at an upstream side of said encasing structure, an air outlet passage formed at a downstream side of said encasing structure, said air inlet and outlet passages opening to the atmosphere and communicating with said gap formed between said exhaust pipe and said encasing structure, first and second valve plates operatively disposed in said air inlet and outlet passages respectively and mechanically connected to each other, diaphragm means linked to said first valve plate for actuating the same, first and second conduit means for connecting said diaphragm means to said intake manifold, a source of electric power supply, solenoid valve means interposed between said first and second conduit means and connected to said source of electric power supply for controlling the fluid communication between said first and second conduit means, and temperature sensitive switch means located between said source of electric power supply and said solenoid valve means and communicating with said catalytic converter, said temperature sensitive switch means being responsive to the temperature of said catalyst in said catalytic converter, whereby, when the catalyst temperature exceeds a predetermined value, said temperature sensitive switch means is switched on to energize said solenoid valve means to provide the fluid communication between said first and second conduit means thereby to cause said diaphragm means to move said first and second valve plates in their open position to admit the atmospheric air into said gap for thereby maintaining the temperature of said catalyst within a certain range.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |