US3868934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation
Assignee: Motors Liquidation Co
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Filing: 1973-03-21
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Granted: 1975-03-04
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Expires: 1993-03-21
Abstract
Abstract In an internal combustion engine equipped with an air valve carburetor, exhaust gases are recirculated through a vacuum operated valve to a port in the carburetor mixture conduit disposed adjacent and traversed by the upstream edge of the air valve. A tube mounted in the carburetor throttle body and air horn castings is utilized to recirculate the exhaust gas to minimize heat transfer to the carburetor.
Inventors
- 👤 Stanley H Mick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:32
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/08; F02M17/09; F02M26/00; F02M26/13; F02M26/17; F02M26/21; F02M26/52; F02M26/55; F02M26/59; F02M26/60; F02M2026/001; F02M2026/003; F02M26/41
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
205 words
An internal combustion engine comprising an induction passage for air flow to the engine, an air valve disposed in said induction passage and rotatable between closed and open positions, means controlling said air valve to maintain a substantially constant pressure in a region of said induction passage downstream from said air valve, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage extending from said exhaust passage to a port disposed in said induction passage adjacent the upstream edge of said air valve when said air valve is in said closed position and traversed by the upstream edge of said air valve as said air valve is rotated from said closed position to said open position whereby when said air valve is in said open position exhaust gases are recirculated into a region of substantially constant pressure in said induction passage to thereby provide recirculation of exhaust gases at a rate proportional to the rate of air flow, and whereby the proportion of exhaust gas flow to air flow may be increased from a minimum when said air valve is in said closed position to a selected value as the upstream edge of said air valve traverses said port.
Claim 2
Dependent Claim
205 words
An internal combustion engine comprising an induction passage for air flow to the engine, an air valve disposed in said induction passage and rotatable between closed and open positions, means controlling said air valve to maintain a substantially constant pressure in a region of said induction passage downstream from said air valve, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage extending from said exhaust passage to a port disposed in said induction passage adjacent the upstream edge of said air valve when said air valve is in said closed position and traversed by the upstream edge of said air valve as said air valve is rotated from said closed position to said open position whereby when said air valve is in said open position exhaust gases are recirculated into a region of substantially constant pressure in said induction passage to thereby provide recirculation of exhaust gases at a rate proportional to the rate of air flow, and whereby the proportion of exhaust gas flow to air flow may be increased from a minimum when said air valve is in said closed position to a selected value as the upstream edge of said air valve traverses said port.
Claim 3
Dependent Claim
158 words
The engine of claim 1 which further comprises a throttle disposed in said induction passage downstream of said air valve and rotatable between closed and wide open positions for controlling air flow therethrough, valve means disposed in said recirculation passage for preventing the flow of exhaust gases therethrough, a diaphragm connected to said valve member, and means for subjecting said diaphragm to the pressure at a port disposed in said induction passage adjacent the upstream edge of said throttle when said throttle is in said closed position and traversed by the upstream edge of said throttle as said throttle is rotated from said closed position, whereby said diaphragm may position said valve member to prevent the flow of exhaust gases through said recirculation passage when said throttle is in said closed and wide open positions and to permit the flow of exhaust gases through said recirculation passage when said throttle is intermediate said closed and wide open positions.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |