Patent US3692003A successfully refreshed from Google Patents.
US3692003A
Expired / Lapsed
US
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Fuel control system for internal combustion engines
Assignee: Denso Corp
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Filing: 1970-07-14
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Granted: 1972-09-19
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Expires: 1990-07-14
Abstract
Abstract A fuel control system for internal combustion engines comprising a first control signal generator to produce an output voltage corresponding to an operating parameter of the engine, and a signal processing circuit including a non-linear means for deriving from the output voltage of the first control signal generator a plurality of voltages having non-linear relation with the output voltage of the first control signal generator, which are adjustable to provide for a plurality of slopes corresponding to respective subdivided portions of the fuel demand characteristic of the engine, and an amplifier-adder to amplify and add together the derived voltages so as to produce a total output voltage conforming to the engine fuel demand characteristic over the entire range of the engine-operating parameter. The pulse width of the pulse signal to energize the fuel injection valves is varied in accordance with the total output voltage from the signal processing circuit. Thus, even if the fuel demand characteristic is non-linear, it may be closely followed over the entire range of the involved engine-operating parameter in controlling the amount of fuel supplied to the engine.
Inventors
- 👤 Hisato Wakamatsu
- 👤 Kunio Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:13
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
223 words
A fuel injector for an internal combustion engine having a solenoid valve mounted in said engine so as to inject fuel when in an open position and responsive to an electrical signal for shifting into said open position comprising: means for detecting an engine operating parameter and producing an electrical signal varying as a function of said parameter, means connected to said detecting and producing means for receiving said electrical signal and producing a first linear and a second non-linear signal which each vary as a function of engine fuel demand characteristics, including resistive means connected to said detecting and producing means and a zener diode connected to said resistive means for shifting from a first to a second resistive condition to vary the ratio between the amplitude of the second signal and the received signal when said received signal reaches a predetermined amplitude, means connected to said receiving and producing means for adding said first and second signals to produce a control signal, and pulse generating means connected to said adding means for receiving said control signal and producing successive valve shifting electrical signals each having a duration which varies with said control signal so that said valve is in said open position successively for a duration which is a function of said engine operating parameter and said engine fuel demand characteristics.
Claim 2
Dependent Claim
223 words
A fuel injector for an internal combustion engine having a solenoid valve mounted in said engine so as to inject fuel when in an open position and responsive to an electrical signal for shifting into said open position comprising: means for detecting an engine operating parameter and producing an electrical signal varying as a function of said parameter, means connected to said detecting and producing means for receiving said electrical signal and producing a first linear and a second non-linear signal which each vary as a function of engine fuel demand characteristics, including resistive means connected to said detecting and producing means and a zener diode connected to said resistive means for shifting from a first to a second resistive condition to vary the ratio between the amplitude of the second signal and the received signal when said received signal reaches a predetermined amplitude, means connected to said receiving and producing means for adding said first and second signals to produce a control signal, and pulse generating means connected to said adding means for receiving said control signal and producing successive valve shifting electrical signals each having a duration which varies with said control signal so that said valve is in said open position successively for a duration which is a function of said engine operating parameter and said engine fuel demand characteristics.
Claim 3
Dependent Claim
65 words
An injector as in claim 1 further including means for detecting a second engine operating parameter and producing a second electrical signal varying as a function of said second parameter, means connecting said second engine parameter detecting and producing means to said adding means so that said adding means adds said first and second non-linear signals and said second signal to produce said control signal.
Claim 4
Dependent Claim
68 words
An injector as in claim 2 further including means for detecting a third engine operating parameter and producing a third electrical signal varying as a function of said third parameter, means connecting said third engine parameter detecting and producing means to said adding means so that said adding means adds said first and second non-linear signals, said second signal and said third signal to produce said control signal.
Claim 5
Dependent Claim
28 words
An injector as in claim 3 wherein said first operating parameter is negative pressure, said second operating parameter is temperature and said third operating parameter is high acceleration.
Claim 6
Dependent Claim
14 words
An injector as in claim 1 wherein said adding means includes an operational amplifier.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |