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US3768449A Expired / Lapsed US ⏱️ 0.0 years remaining

Electronic energizing system for solenoid fuel injectors

Assignee: Carter Automotive Co Inc
•
Filing: 1971-12-27
•
Granted: 1973-10-30
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Expires: 1991-12-27
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Abstract

Abstract A system for energizing solenoid valve injectors sequentially, includes a separate channel for each injector on which synchronized fuel demand pulses are impressed. Each channel includes a transistor connecting one terminal of its injector to ground and a control circuit responsive to the input pulses for making said transistor conductive. The other terminal of the injector is connected to a stabilized source of voltage capable of supplying a holding current to the injector, and said terminal of the injector is also connected through a silicon controlled rectifier to an inductor. The inductor is common to all channels, and circuitry responsive to the fuel pulses enables the inductor to supply a high starting current in response to the beginning of each fuel pulse to cause rapid opening of the solenoid injectors and then permit the injector current to drop approximately to the holding level. Another circuit rapidly dissipates the injector current at the end of a fuel pulse.

Inventors

  • 👤 A Lindberg

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 11:04
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/20; F02D2041/2003; F02D2041/201; F02D2041/202; F02D2041/2031; F02D2041/2058

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 109 words
An electronic fuel injection sytem, comprising a solenoid valve injector, a stabilized voltage source, a normally blocked first transistor, switching means connected in series with said transistor and said injector, means for supplying fuel demand voltage pulses having a duration substantially equal to the required time of opening of the injector, an inductor connected in series with said voltage source and having one end thereof normally grounded and also connected to said switching means, and control means responsive to a fuel demand pulse for rendering said first transistor and switching means conductive and causing said inductor to supply a high power pulse to the injector for opening it rapidly.
Claim 2
Dependent Claim 109 words
An electronic fuel injection sytem, comprising a solenoid valve injector, a stabilized voltage source, a normally blocked first transistor, switching means connected in series with said transistor and said injector, means for supplying fuel demand voltage pulses having a duration substantially equal to the required time of opening of the injector, an inductor connected in series with said voltage source and having one end thereof normally grounded and also connected to said switching means, and control means responsive to a fuel demand pulse for rendering said first transistor and switching means conductive and causing said inductor to supply a high power pulse to the injector for opening it rapidly.
Claim 3
Dependent Claim 30 words
A system according to claim 1, including means for terminating said high power pulse after a fixed interval which is short compared to the duration of a fuel demand pulse.
Claim 4
Dependent Claim 34 words
A system according to claim 2, wherein said means for terminating the high power pulse includes a second transistor connecting said one end of the inductor to ground, said second transistor being normally conductive.
Claim 5
Dependent Claim 20 words
A system according to claim 3, including a monostable multivibrator connected to said second transistor for controlling the conductivity thereof.
Claim 6
Dependent Claim 30 words
A system according to claim 4, wherein said multivibrator is responsive to the beginning of a fuel demand pulse for blocking said second transistor during the opening of the injector.
Claim 7
Dependent Claim 29 words
A system according to claim 1, wherein said switching means includes a silicon controlled rectifier having its anode connected to the inductor and its cathode connected to the injector.
Claim 8
Dependent Claim 56 words
A system according to claim 1, including an amplifier responsive to a fuel demand pulse for controlling the conductivity of said first transistor, and means responsive to injector current for supplying a negative feedback current to said amplifier for stabilizing the current supplied to said injector at a value slightly greater than the holding current thereof.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-10-29 1977-04-30 1977-10-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-10-29 1981-04-30 1981-10-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-10-29 1985-04-30 1985-10-30 $7700.00 Window Closed / Lapsed

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