Patent US3610219A successfully refreshed from Google Patents.
US3610219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation control
Assignee: Motors Liquidation Co
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Filing: 1970-05-22
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Granted: 1971-10-05
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Expires: 1990-05-22
Abstract
Abstract In an internal combustion engine, exhaust gas is recirculated from the intake manifold exhaust gas crossover passage to the induction passage. An exhaust gas recirculation control valve is positioned by the throttle to proportion exhaust gas recirculation flow to induction airflow. In one embodiment, the exhaust gas recirculation passages are cast integrally in the intake manifold. Fuel metering in a timed fuel injection system responsive to manifold absolute pressure is compensated for exhaust gas recirculation.
Inventors
- 👤 Francis A Sciabica
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:51
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/63; F02M26/13; F02M26/42; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/0077; F02M1/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
314 words
In an internal combustion engine having an induction passage for airflow to the engine, a throttle disposed in said induction passage and rotatable between closed and open positions for controlling airflow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage extending from said exhaust passage to said induction passage for recirculating exhaust gas to said induction passage: a control valve mounted on a rotatable shaft in said exhaust gas recirculation passage and controlling exhaust gas flow therethrough, and means for operating said control valve comprising a valve lever secured to said shaft and having a cam follower portion, a cam member having a straight slot formed therein, support means extending through said slot to support said member for linear movement thereof, said member further having a cam surface along one edge thereof including a first valve closed portion, a first valve moving ramp, a peak valve opening portion, a second valve moving ramp, and a second valve closed portion, means biasing said cam follower portion of said control valve lever against said cam surface whereby said control valve is positioned in accordance with the position of said cam member, and linking means connecting said cam member and said throttle for concomitant movement, whereby said cam member is moved linearly as said throttle is rotated from closed to open position and said cam follower portion of said control valve lever successively contacts said first valve closed portion and said control valve remains closed, said first valve moving ramp and said control valve opens, said peak valve opening portion and said control valve remains open, said second valve moving ramp and said control valve closes, and said second valve closed portion and said control valve remains closed, thereby proportioning the flow of exhaust gas recirculated to said induction passage to the flow of air through said induction passage.
Claim 2
Dependent Claim
314 words
In an internal combustion engine having an induction passage for airflow to the engine, a throttle disposed in said induction passage and rotatable between closed and open positions for controlling airflow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage extending from said exhaust passage to said induction passage for recirculating exhaust gas to said induction passage: a control valve mounted on a rotatable shaft in said exhaust gas recirculation passage and controlling exhaust gas flow therethrough, and means for operating said control valve comprising a valve lever secured to said shaft and having a cam follower portion, a cam member having a straight slot formed therein, support means extending through said slot to support said member for linear movement thereof, said member further having a cam surface along one edge thereof including a first valve closed portion, a first valve moving ramp, a peak valve opening portion, a second valve moving ramp, and a second valve closed portion, means biasing said cam follower portion of said control valve lever against said cam surface whereby said control valve is positioned in accordance with the position of said cam member, and linking means connecting said cam member and said throttle for concomitant movement, whereby said cam member is moved linearly as said throttle is rotated from closed to open position and said cam follower portion of said control valve lever successively contacts said first valve closed portion and said control valve remains closed, said first valve moving ramp and said control valve opens, said peak valve opening portion and said control valve remains open, said second valve moving ramp and said control valve closes, and said second valve closed portion and said control valve remains closed, thereby proportioning the flow of exhaust gas recirculated to said induction passage to the flow of air through said induction passage.
Claim 3
Dependent Claim
210 words
In an internal combustion engine having an induction passage for airflow to the engine, a throttle mounted on a rotatable throttle shaft in said induction passage controlling airflow therethrough, an exhaust passage for exhaust gas flow from the engine, an exhaust gas recirculation passage extending from said exhaust passage to said induction passage for recirculating exhaust gas to said induction passage, and a control valve mounted on a rotatable valve shaft in said exhaust gas recirculation passage controlling exhaust gas flow therethrough: means for operating said control valve comprising a cam, operating mechanism providing a one-way drive connection between said cam and said valve shaft whereby movement of said cam in a valve opening direction may move said valve shaft in a valve opening direction and whereby said cam may move in a valve closing direction while said control valve remains stationary, means biasing said valve shaft in a valve closing direction, linking means providing a one-way drive connection between said throttle shaft and said cam whereby movement of said throttle shaft in a throttle opening direction may move said cam in a valve-opening direction and whereby said throttle shaft may move in a throttle-closing direction while said cam remains stationary, and means biasing said cam in a valve-closing direction.
Claim 4
Dependent Claim
210 words
In an internal combustion engine having an induction passage for airflow to the engine, a throttle mounted on a rotatable throttle shaft in said induction passage controlling airflow therethrough, an exhaust passage for exhaust gas flow from the engine, an exhaust gas recirculation passage extending from said exhaust passage to said induction passage for recirculating exhaust gas to said induction passage, and a control valve mounted on a rotatable valve shaft in said exhaust gas recirculation passage controlling exhaust gas flow therethrough: means for operating said control valve comprising a cam, operating mechanism providing a one-way drive connection between said cam and said valve shaft whereby movement of said cam in a valve opening direction may move said valve shaft in a valve opening direction and whereby said cam may move in a valve closing direction while said control valve remains stationary, means biasing said valve shaft in a valve closing direction, linking means providing a one-way drive connection between said throttle shaft and said cam whereby movement of said throttle shaft in a throttle opening direction may move said cam in a valve-opening direction and whereby said throttle shaft may move in a throttle-closing direction while said cam remains stationary, and means biasing said cam in a valve-closing direction.
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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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |