US3744248A
Expired / Lapsed
US
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Catalytic convertor temperature control system
Assignee: Motors Liquidation Co
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Filing: 1972-04-10
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Granted: 1973-07-10
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Expires: 1992-04-10
Abstract
Abstract A temperature control system for a catalytic convertor in an exhaust emission system for an internal combustion engine includes a cooling loop for lowering the exhaust gas temperature to prevent overheating of the convertor. The system includes a crossover passage in the engine intake manifold and a pair of conduits separately connected to the exhaust manifolds and commonly connected at a Y-pipe including a convertor temperature responsive diverter valve that is operable to selectively route the gases through the conduits. One conduit has a relatively short length wherein the exhaust gases experience a small temperature loss and the other conduit or cooling loop has a longer length of pipe including a section of corrugated tubing having an increased heat transfer area wherein the exhaust gases experience a large temperature loss. During warmup and normal operating conditions the valve routes the exhaust gases through the crossover passage and the shorter conduit. When the convertor exceeds a predetermined temperature, the valve routes the exhaust gases through the crossover passage and the longer conduit thereby lowering exhaust gas temperature to provide a lower inlet temperature at the convertor and maintain the temperature of the convertor within a predetermined range.
Inventors
- 👤 M Foster
- 👤 M Patterson
- 👤 J Jalbing
- 👤 L Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:01
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2046; F01N3/02; F01N3/0205; F01N3/05; F01N2240/00; F01N2240/02; F01N2390/00; F01N2390/04; F01N2470/00; F01N2470/12; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
235 words
In a moTor vehicle, the combination comprising: an internal combustion engine having a pair of exhaust manifolds for discharging exhaust gases; passage means on said engine fluidly connecting said manifolds; a catalytic convertor; first conduit means fluidly connecting one of said manifolds to said convertor, said first conduit means including heat transfer means for lowering the temperature of exhaust gases flowing therethrough; second conduit means fluidly connecting the other of said manifolds to said convertor; valve means selectively operative to restrict the flow of exhaust gases through said conduits; means for actuating said valve means to restrict said first conduit means when the catalytic convertor is operating below a predetermined temperature so as to route substantially all exhaust gases from said one of said manifolds through said passage means to the other of said manifolds whereby the exhaust gases from both manifolds are routed through the second conduit means to said catalytic convertor, said means actuating said valve means to restrict said second conduit means when said catalytic convertor is operating above said predetermined temperature so as to route substantially all the exhaust gases from said other of said manifold through said passage means to said one of said manifolds whereby the exhaust gases from both manifolds are routed through said first conduit means and said heat transfer means to the convertor thereby lowering the temperature of the exhaust gases prior to entering said convertor.
Claim 2
Dependent Claim
235 words
In a moTor vehicle, the combination comprising: an internal combustion engine having a pair of exhaust manifolds for discharging exhaust gases; passage means on said engine fluidly connecting said manifolds; a catalytic convertor; first conduit means fluidly connecting one of said manifolds to said convertor, said first conduit means including heat transfer means for lowering the temperature of exhaust gases flowing therethrough; second conduit means fluidly connecting the other of said manifolds to said convertor; valve means selectively operative to restrict the flow of exhaust gases through said conduits; means for actuating said valve means to restrict said first conduit means when the catalytic convertor is operating below a predetermined temperature so as to route substantially all exhaust gases from said one of said manifolds through said passage means to the other of said manifolds whereby the exhaust gases from both manifolds are routed through the second conduit means to said catalytic convertor, said means actuating said valve means to restrict said second conduit means when said catalytic convertor is operating above said predetermined temperature so as to route substantially all the exhaust gases from said other of said manifold through said passage means to said one of said manifolds whereby the exhaust gases from both manifolds are routed through said first conduit means and said heat transfer means to the convertor thereby lowering the temperature of the exhaust gases prior to entering said convertor.
Claim 3
Dependent Claim
308 words
In a motor vehicle, the combination comprising an internal combustion engine having an intake manifold and first and second exhaust manifolds from which exhaust gases are discharged during operation of the engine; a crossover passage in said intake manifold fluidly connecting said first and second exhaust manifolds; a catalytic convertor adapted for operation within a predetermined temperature range; a first conduit fluidly connected to said first exhaust manifold; a second conduit having a substantially greater length than said first conduit fluidly connected to said second exhaust manifold; a section on said second conduit having an expanded heat transfer area for radiantly cooling the exhaust gases flowing therethrough; a third conduit commonly connecting said first and second conduits to said convertor; a valve in said third conduit, said valve operable in one position to block the flow of gases in said first conduit and operable in another position to block the flow of gases in said second conduit; control means for actuating said valve between said positions to block said second conduit when the catalytic convertor is operating within or below said predetermined temperature range so as to route substantially all the exhaust gases from said second exhaust manifold through said crossover passage to said first exhaust manifold whereby the exhaust gases from both exhaust manifolds are routed through the second conduit to said catalytic convertor, said control means actuating said valve to block said first conduit when said catalytic convertor is operating above said predetermined temperature range so as to route substantially all the exhaust gases from said first exhaust manifold through said crossover passage to said second exhaust manifold whereby the exhaust gases from both manifolds are routed through said second conduit and said section to the convertor thereby cooling the exhaust gases and reducing the operating temperature of said convertor to within said predetermined temperature range.
Claim 4
Dependent Claim
308 words
In a motor vehicle, the combination comprising an internal combustion engine having an intake manifold and first and second exhaust manifolds from which exhaust gases are discharged during operation of the engine; a crossover passage in said intake manifold fluidly connecting said first and second exhaust manifolds; a catalytic convertor adapted for operation within a predetermined temperature range; a first conduit fluidly connected to said first exhaust manifold; a second conduit having a substantially greater length than said first conduit fluidly connected to said second exhaust manifold; a section on said second conduit having an expanded heat transfer area for radiantly cooling the exhaust gases flowing therethrough; a third conduit commonly connecting said first and second conduits to said convertor; a valve in said third conduit, said valve operable in one position to block the flow of gases in said first conduit and operable in another position to block the flow of gases in said second conduit; control means for actuating said valve between said positions to block said second conduit when the catalytic convertor is operating within or below said predetermined temperature range so as to route substantially all the exhaust gases from said second exhaust manifold through said crossover passage to said first exhaust manifold whereby the exhaust gases from both exhaust manifolds are routed through the second conduit to said catalytic convertor, said control means actuating said valve to block said first conduit when said catalytic convertor is operating above said predetermined temperature range so as to route substantially all the exhaust gases from said first exhaust manifold through said crossover passage to said second exhaust manifold whereby the exhaust gases from both manifolds are routed through said second conduit and said section to the convertor thereby cooling the exhaust gases and reducing the operating temperature of said convertor to within said predetermined temperature range.
Claim 5
Dependent Claim
381 words
A catalytic convertor overtemperature control system for a motor vehicle comprising: an internal combustion engine on said vehicle including an intake manifold; first and second exhaust manifolds on said engine from which exhaust gases are discharged during operation of the engine; a crossover passage in said intake manifold fluidly connecting said first and second exhaust manifolds; a catalytic convertor adapted for operation within a predetermined temperatUre range; a first conduit having one end fluidly connected to said first exhaust manifold; a second conduit having a substantially greater length than said first conduit, said second conduit having one end fluidly connected to said second exhaust manifold; a section of corrugated tubing on said second conduit, said corrugated tubing having an expanded heat transfer area for radiant cooling of the exhaust gases flowing therethrough; a Y-pipe connecting the other ends of said first and second conduits and said convertor; a valve in said Y-pipe, said valve movable to a one position wherein the flow of exhaust gases through said first conduit is prevented and movable to another position wherein the flow of gases through said second conduit is prevented; a vacuum motor connected to said valve for moving said valve between said positions; control means including temperature sensing means, said sensing means mounted on said convertor for sensing the temperature thereof, said control means actuating said vacuum motor to move said valve to said one position when the catalytic convertor is operating within or below said predetermined temperature range as determined by sensing means so as to route substantially all the exhaust gases from said second exhaust manifold through said crossover passage to said first exhaust manifold whereby the exhaust gases from both exhaust manifolds are routed through the second conduit to said catalytic convertor, said control means actuating said valve to another position when said catalytic convertor is operating above said predetermined temperature range as determined by said sensing means so as to route substantially all the exhaust gases from said first exhaust manifold through said crossover passage to said second exhaust manifold whereby the exhaust gases from both manifolds are routed through said second conduit and said corrugated tubing to the convertor thereby cooling the exhaust gases and reducing the operating temperature of said convertor to within said predetermined temperature range.
Claim 6
Dependent Claim
381 words
A catalytic convertor overtemperature control system for a motor vehicle comprising: an internal combustion engine on said vehicle including an intake manifold; first and second exhaust manifolds on said engine from which exhaust gases are discharged during operation of the engine; a crossover passage in said intake manifold fluidly connecting said first and second exhaust manifolds; a catalytic convertor adapted for operation within a predetermined temperatUre range; a first conduit having one end fluidly connected to said first exhaust manifold; a second conduit having a substantially greater length than said first conduit, said second conduit having one end fluidly connected to said second exhaust manifold; a section of corrugated tubing on said second conduit, said corrugated tubing having an expanded heat transfer area for radiant cooling of the exhaust gases flowing therethrough; a Y-pipe connecting the other ends of said first and second conduits and said convertor; a valve in said Y-pipe, said valve movable to a one position wherein the flow of exhaust gases through said first conduit is prevented and movable to another position wherein the flow of gases through said second conduit is prevented; a vacuum motor connected to said valve for moving said valve between said positions; control means including temperature sensing means, said sensing means mounted on said convertor for sensing the temperature thereof, said control means actuating said vacuum motor to move said valve to said one position when the catalytic convertor is operating within or below said predetermined temperature range as determined by sensing means so as to route substantially all the exhaust gases from said second exhaust manifold through said crossover passage to said first exhaust manifold whereby the exhaust gases from both exhaust manifolds are routed through the second conduit to said catalytic convertor, said control means actuating said valve to another position when said catalytic convertor is operating above said predetermined temperature range as determined by said sensing means so as to route substantially all the exhaust gases from said first exhaust manifold through said crossover passage to said second exhaust manifold whereby the exhaust gases from both manifolds are routed through said second conduit and said corrugated tubing to the convertor thereby cooling the exhaust gases and reducing the operating temperature of said convertor to within said predetermined temperature range.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |