Patent US3670706A successfully refreshed from Google Patents.
US3670706A
Expired / Lapsed
US
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Fuel injection control system for internal combustion engines
Assignee: Denso Corp
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Filing: 1970-07-06
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Granted: 1972-06-20
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Expires: 1990-07-06
Abstract
Abstract A fuel injection control system for internal combustion engines, wherein, the fuel supply is adapted to be cut during coasting only if the pressure of air in the engine suction pipe is detected to drop below a certain predetermined value and at the same time the engine throttle is detected either to be moving in the direction of decreasing the degree of opening of the throttle valve or to remain stationary, and the fuel supply is resumed to recover the acceleration of the engine when the throttle starts to move in the direction of increasing the opening of the throttle valve even during the coasting of the engine.
Inventors
- 👤 Hideya Fujisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02M; F02M51/00; F02M51/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A fuel injection control system for internal combustion engines comprising an electromagnetically operated fuel injector valve, a circuit connected to said valve for producing a square-wave signal to control said fuel injector valve with respect to the operative time of said valve in accordance with operating parameters of the engine, an air pressure detector to detect absolute pressure in suction pipe to produce an electric signal for impression on said square-wave producing circuit, and a throttle motion detector having a permanent magnet linked to a throttle lever and a coil positioned surrounding said magnet for causing the pulse width of said square-wave signal delivered from said circuit to be reduced to zero when the engine throttle is either moving in the direction of decreasing the throttle opening or stationary and at the same time the air pressure in the suction pipe becomes lower than the pressure corresponding to the idling condition of said engine.
Claim 2
Dependent Claim
154 words
A fuel injection control system for internal combustion engines comprising an electromagnetically operated fuel injector valve, a circuit connected to said valve for producing a square-wave signal to control said fuel injector valve with respect to the operative time of said valve in accordance with operating parameters of the engine, an air pressure detector to detect absolute pressure in suction pipe to produce an electric signal for impression on said square-wave producing circuit, and a throttle motion detector having a permanent magnet linked to a throttle lever and a coil positioned surrounding said magnet for causing the pulse width of said square-wave signal delivered from said circuit to be reduced to zero when the engine throttle is either moving in the direction of decreasing the throttle opening or stationary and at the same time the air pressure in the suction pipe becomes lower than the pressure corresponding to the idling condition of said engine.
References Cited (Backward Citations)
US2911966A
Cited
US2859738A
Cited
FR1243288A
Cited
US3463130A
Cited
US3430616A
Cited
US3515104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |