Patent US3869858A successfully refreshed from Google Patents.
US3869858A
Expired / Lapsed
US
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Exhaust gas purifying system for motor vehicles
Assignee: Toyota Motor Corp
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Filing: 1973-07-23
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Granted: 1975-03-11
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Expires: 1993-07-23
Abstract
Abstract An exhaust gas purifying system for motor vehicles includes a flow control valve which is operable in response to a warmup condition, acceleration condition, or other operating condition of the engine to supply secondary air selectively to either reduction treatment means or oxidation treatment means which are installed in the exhaust system for treating the exhaust gases.
Inventors
- 👤 Kenji Goto
- 👤 Ryozo Mitsui
- 👤 Norikatsu Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:50
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/22; F01N3/222; F01N3/20; F01N3/2053; F01N3/227; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86879; Y10T137/86895
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
An exhaust gas purifying system for motor vehicle engines comprising an exhaust conduit, a reducing-catalyst converter and an oxidizing-catalyst converter installed in said exhaust conduit, an air pump for supplying secondary air, a flow control valve receiving secondary air flow from said air pump, said flow control valve having a first and a second discharge outlet, a first conduit between said first discharge outlet and a point of said exhaust conduit upstream of said reducing-catalyst converter, a second conduit means between said second discharge outlet and a point of said exhaust conduit between said reducingcatalyst converter and said oxidizing-catalyst converter, control means for controlling said flow control valve depending on the operating condition of said engine to control the amount of secondary air passing through said first and second conduit means, a first by-pass conduit means by-passing said control valve and providing communication between said air pump and a point of said exhaust conduit upstream of said reducing-catalyst converter, and a second by-pass conduit means by-passing said control valve and providing communication between said air pump at a point of said exhaust conduit between said reducing-catalyst converter and said oxidizing-catalyst converter.
Claim 2
Dependent Claim
191 words
An exhaust gas purifying system for motor vehicle engines comprising an exhaust conduit, a reducing-catalyst converter and an oxidizing-catalyst converter installed in said exhaust conduit, an air pump for supplying secondary air, a flow control valve receiving secondary air flow from said air pump, said flow control valve having a first and a second discharge outlet, a first conduit between said first discharge outlet and a point of said exhaust conduit upstream of said reducing-catalyst converter, a second conduit means between said second discharge outlet and a point of said exhaust conduit between said reducingcatalyst converter and said oxidizing-catalyst converter, control means for controlling said flow control valve depending on the operating condition of said engine to control the amount of secondary air passing through said first and second conduit means, a first by-pass conduit means by-passing said control valve and providing communication between said air pump and a point of said exhaust conduit upstream of said reducing-catalyst converter, and a second by-pass conduit means by-passing said control valve and providing communication between said air pump at a point of said exhaust conduit between said reducing-catalyst converter and said oxidizing-catalyst converter.
Claim 3
Dependent Claim
191 words
An exhaust gas purifying system for motor vehicle engines comprising an exhaust conduit, a reducing-catalyst converter and an oxidizing-catalyst converter installed in said exhaust conduit, an air pump for supplying secondary air, a flow control valve receiving secondary air flow from said air pump, said flow control valve having a first and a second discharge outlet, a first conduit between said first discharge outlet and a point of said exhaust conduit upstream of said reducing-catalyst converter, a second conduit means between said second discharge outlet and a point of said exhaust conduit between said reducing-catalyst converter and said oxidizing-catalyst converter, control means for controlling said flow control valve depending on the operating condition of said engine to control the amount of secondary air passing through said first and second conduit means, a first by-pass conduit means by-passing said control valve and providing communication between said air pump and a point of said exhaust conduit upstream of said reducing-catalyst converter, and a second by-pass conduit means by-passing said control valve and providing communication between said air pump at a point of said exhaust conduit between said reducing-catalyst converter and said oxidizing-catalyst converter.
Claim 4
Dependent Claim
191 words
An exhaust gas purifying system for motor vehicle engines comprising an exhaust conduit, a reducing-catalyst converter and an oxidizing-catalyst converter installed in said exhaust conduit, an air pump for supplying secondary air, a flow control valve receiving secondary air flow from said air pump, said flow control valve having a first and a second discharge outlet, a first conduit between said first discharge outlet and a point of said exhaust conduit upstream of said reducing-catalyst converter, a second conduit means between said second discharge outlet and a point of said exhaust conduit between said reducing-catalyst converter and said oxidizing-catalyst converter, control means for controlling said flow control valve depending on the operating condition of said engine to control the amount of secondary air passing through said first and second conduit means, a first by-pass conduit means by-passing said control valve and providing communication between said air pump and a point of said exhaust conduit upstream of said reducing-catalyst converter, and a second by-pass conduit means by-passing said control valve and providing communication between said air pump at a point of said exhaust conduit between said reducing-catalyst converter and said oxidizing-catalyst converter.
Claim 5
Dependent Claim
159 words
An exhaust gas purifying system for motor vehicle engines comprising an exhaust conduit, a reducing-catalyst converter and an oxidizing-catalyst converter installed in said exhaust conduit, an air pump for supplying secondary air, a flow control valve receiving secondary air flow from said air pump, said flow control valve having a first and a second discharge outlet, a first conduit between said first discharge outlet and a point of said exhaust conduit upstream of said reducing-catalyst converter, a second conduit means between said second discharge outlet and a point of said exhaust conduit between said reducing-catalyst converter and said oxidizing-catalyst converter, control means for controlling said flow control valve depending on the operating condition of said engine to control the amount of secondary air passing through said first and second conduit means, said control valve having inlet means, and by-pass means in said control valve by-passing said secondary air from said inlet means to said first and second discharge outlets.
Claim 6
Dependent Claim
159 words
An exhaust gas purifying system for motor vehicle engines comprising an exhaust conduit, a reducing-catalyst converter and an oxidizing-catalyst converter installed in said exhaust conduit, an air pump for supplying secondary air, a flow control valve receiving secondary air flow from said air pump, said flow control valve having a first and a second discharge outlet, a first conduit between said first discharge outlet and a point of said exhaust conduit upstream of said reducing-catalyst converter, a second conduit means between said second discharge outlet and a point of said exhaust conduit between said reducing-catalyst converter and said oxidizing-catalyst converter, control means for controlling said flow control valve depending on the operating condition of said engine to control the amount of secondary air passing through said first and second conduit means, said control valve having inlet means, and by-pass means in said control valve by-passing said secondary air from said inlet means to said first and second discharge outlets.
Claim 7
Dependent Claim
26 words
An exhaust gas purifying system according to claim 1 including flow restriction means in said first by-pass conduit means and in said second by-pass conduit means.
Claim 8
Dependent Claim
27 words
An exhaust gas purifying system according to claim 2 wherein said control valve has an operating disc element, said by-pass means comprising passages in said disc element.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |