US3704702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Start-up fuel injection system
Assignee: Nissan Motor Co Ltd
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Filing: 1970-10-19
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Granted: 1972-12-05
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Expires: 1990-10-19
Abstract
Abstract A start-up fuel injection system for an internal combustion engine providing an enriched air-fuel mixture during start-up and warming-up by a solenoid valve controlled injector system. The solenoid valve is energized in dependence on a signal produced by a combination of actions of a thyristor and a thermistor or a combination of similar basic elements.
Inventors
- 👤 Shigeo Aono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:32
CPC Classifications
F; F02; F02M; F02M71/00; F02M71/04; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/062; F02D41/064; F02N; F02N19/00; F02N19/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
246 words
A start-up fuel injection system for an internal combustion engine having an engine cylinder, a cylinder block and a fuel injection nozzle adapted to supply fuel in highly atomized form to intake air to be delivered to said engine cylinder when opened, said start-up fuel injection system comprising a battery; a starting switch connected to said battery; a solenoid valve for closing and opening said fuel injection nozzle; a solenoid coil having first and second terminals; said solenoid coil being connected at its first terminal to said battery through said starting switch; a thyristor having an anode connected to said second terminal of said solenoid coil and a cathode; a first resistor connected at its one end to said cathode of said thyristor; a second resistor having one end connected to the other end of said first resistor and the other end connected to a junction between said first terminal of said solenoid coil and said starting switch, and a thermistor having a high temperature resistance mounted on said cylinder block and connected to a point between said first and second resistors, the resistance values of said first and second resistors and said thermistor being determined to cause the potential at the point between said first and second resistors to be high so as to turn on said thyristor when said engine temperature is below the predetermined value, said solenoid coil is energized to actuate said solenoid valve for thereby opening said starting fuel injection nozzle.
Claim 2
Dependent Claim
246 words
A start-up fuel injection system for an internal combustion engine having an engine cylinder, a cylinder block and a fuel injection nozzle adapted to supply fuel in highly atomized form to intake air to be delivered to said engine cylinder when opened, said start-up fuel injection system comprising a battery; a starting switch connected to said battery; a solenoid valve for closing and opening said fuel injection nozzle; a solenoid coil having first and second terminals; said solenoid coil being connected at its first terminal to said battery through said starting switch; a thyristor having an anode connected to said second terminal of said solenoid coil and a cathode; a first resistor connected at its one end to said cathode of said thyristor; a second resistor having one end connected to the other end of said first resistor and the other end connected to a junction between said first terminal of said solenoid coil and said starting switch, and a thermistor having a high temperature resistance mounted on said cylinder block and connected to a point between said first and second resistors, the resistance values of said first and second resistors and said thermistor being determined to cause the potential at the point between said first and second resistors to be high so as to turn on said thyristor when said engine temperature is below the predetermined value, said solenoid coil is energized to actuate said solenoid valve for thereby opening said starting fuel injection nozzle.
Claim 3
Dependent Claim
46 words
A start-up fuel injection nozzle according to claim 1, further comprising a resistor connected between said second terminal of said solenoid coil and said anode of said thyristor, and a capacitor having one terminal connected to said resistor and the other terminal connected to the ground.
Claim 4
Dependent Claim
27 words
A start-up fuel injection system according to claim 1, wherein said solenoid coil includes a diode connected across said first and second terminals at said solenoid coil.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |