US3762379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for injecting metered quantity of fuel into engine
Assignee: Denso Corp
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Filing: 1971-07-29
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Granted: 1973-10-02
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Expires: 1991-07-29
Abstract
Abstract A system for injecting a metered quantity of fuel into an engine having a fuel injection pump, an electrically controlled metering valve, and a fluid passage connecting the fuel outlet port of the metering valve to the fuel suction port of the fuel injection pump. In the system, the volume of the fluid passage is suitably selected to lie within a specific range so that the metering of fuel by the metering valve is continued for a period of time more than that during which the fuel suction port of the fuel injection pump is kept open.
Inventors
- 👤 N Hobo
- 👤 Y Natsume
- 👤 Y Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:37
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D1/00; F02D2700/00; F02D2700/02; F02D2700/0269; F02D2700/0282; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
323 words
A system for injecting a metered quantity of fuel into an engine having a crankshaft comprising: a cam shaft rotated at a constant speed reduction ratio by said engine crankshaft, a fuel injection pump, including a cylinder, a piston reciprocated in said cylinder to deliver fuel and defining within said cylinder a pump chamber, said cylinder having a fuel suction port for receiving fuel which is opened by said piston during a fuel receiving cycle portion and closed by said piston during a fuel delivery cycle portion, electromagnetically operated metering means having a fuel inlet port and a fuel outlet port, electrical control means connected to said electromagnetically operated metering means for applying a timing signal having a time duration determining the amount of fuel injected during a cycle to said metering means to operate said metering means during said cycle portions, and means defining a fluid passage connecting the fuel outlet port of said electromagnetically operated metering means to said fuel suction port of said fuel injection pump for receiving via said metering means during each said cycle a quantity of fuel as determined by said timing signal so that the fuel in said fluid passage passes via said fuel suction port into said pump chamber during each said fuel receiving cycle portion, wherein the volume Va of said fluid passage is so selected as to lie within the range satisfying the relation 0.1 Vb < OR = Va < OR = 5 MVb, where Vb is the variation in the volume of the pump chamber during one operating cycle of said fuel injection pump and M is the number of operating cycles of said fuel injection pump during one rotation of the drive shaft, whereby the metering of fuel by said electromagnetically operated metering means is continued for a period of time which is more than that during which the fuel suction port of said fuel injection pump is kept open.
Claim 2
Independent Claim
323 words
A system for injecting a metered quantity of fuel into an engine having a crankshaft comprising: a cam shaft rotated at a constant speed reduction ratio by said engine crankshaft, a fuel injection pump, including a cylinder, a piston reciprocated in said cylinder to deliver fuel and defining within said cylinder a pump chamber, said cylinder having a fuel suction port for receiving fuel which is opened by said piston during a fuel receiving cycle portion and closed by said piston during a fuel delivery cycle portion, electromagnetically operated metering means having a fuel inlet port and a fuel outlet port, electrical control means connected to said electromagnetically operated metering means for applying a timing signal having a time duration determining the amount of fuel injected during a cycle to said metering means to operate said metering means during said cycle portions, and means defining a fluid passage connecting the fuel outlet port of said electromagnetically operated metering means to said fuel suction port of said fuel injection pump for receiving via said metering means during each said cycle a quantity of fuel as determined by said timing signal so that the fuel in said fluid passage passes via said fuel suction port into said pump chamber during each said fuel receiving cycle portion, wherein the volume Va of said fluid passage is so selected as to lie within the range satisfying the relation 0.1 Vb < OR = Va < OR = 5 MVb, where Vb is the variation in the volume of the pump chamber during one operating cycle of said fuel injection pump and M is the number of operating cycles of said fuel injection pump during one rotation of the drive shaft, whereby the metering of fuel by said electromagnetically operated metering means is continued for a period of time which is more than that during which the fuel suction port of said fuel injection pump is kept open.
Claim 3
Dependent Claim
30 words
A system as claimed in claim 1, in which said electromagnetically operated metering means is a solenoid operated valve having a needle valve member normally closing the fuel outlet port.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |