US3590793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reducing hydrocarbon content of engine exhaust gases during deceleration of automobile
Assignee: Nissan Motor Co Ltd
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Filing: 1968-12-05
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Granted: 1971-07-06
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Expires: 1988-12-05
Abstract
Abstract A system for reducing the hydrocarbon content of engine exhaust gases emitted during deceleration of an automobile by controlling both the air-fuel ratio of the engine fuel mixture and the intake manifold vacuum which increases rapidly as soon as the automobile starts to slow down, said air-fuel ratio and intake manifold vacuum being controlled by supplying air to the intake manifold of the engine by way of the step mixture supply flow path of the secondary side of a carburetor of compound-type, which path is kept substantially inoperative during the deceleration of the automobile.
Inventors
- 👤 Kenji Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:35
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/08; F02M3/09
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
57 words
The system as set forth in claim 1, wherein said valve assembly further comprises a solenoid device which becomes energized in response to the increase in the vacuum at the intake manifold of the engine for thereby causing said valve member to move to a position to permit said mixture passage to communicate with said deceleration port.
Claim 2
Dependent Claim
165 words
The system as set forth in claim 2, wherein said solenoid device is connected by an electrical circuit to a diaphragm switch assembly by way of a power source, said diaphragm switch assembly being divided by a diaphragm member into atmospheric and suction chambers, of which the atmospheric chamber has accommodated therein a set of moving and stationary contacts both connected with said electrical circuit and of which the suction chamber communicates with the intake manifold of the engine and has accommodated therein a coil spring acting to normally keep said moving contact releases from said stationary contact, wherein, as an increased vacuum develops at the intake manifold of the engine during the decelerating operation, said diaphragm member is displaced by the increased vacuum exerted thereon and against the action of the last named coil spring in a direction to cause said moving contact to abut against said stationary contact for causing said solenoid device be energized from said power source during the decelerating operation.
Claim 3
Dependent Claim
21 words
The system as set forth in claim 3, wherein said secondary butterfly valve is made thinner toward the peripheral edge thereof.
References Cited (Backward Citations)
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US2621911A
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US2824726A
Cited
US3042387A
Cited
US3078078A
Cited
US3304068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |