US3673989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acceleration actuating device for fuel injection system
Assignee: Nissan Motor Co Ltd
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Filing: 1970-10-19
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Granted: 1972-07-04
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Expires: 1990-10-19
Abstract
Abstract An acceleration device adapted for incorporation into an automobile fuel injection system so as to provide for an instantaneous increase in the quantity of injection fuel supplied to the individual cylinders. A throttle valve position detector or intake pressure sensor is adapted to detect the driver''s effort to effect acceleration. An acceleration signal generating circuit is connected to the throttle valve position detector or intake pressure sensor, so that upon detection of the driver''s effort the circuit generates a first and second acceleration signals. The first acceleration signal is supplied to an injection valve actuation circuit so as to energize the injection valve, thereby providing an enriched air-fuel mixture for acceleration. The second acceleration signal is applied to a computing circuit to increase the width of an injection pulse signal generated thereby. The increase in the width of the injection pulses also causes the increase in the quantity of injection fuel supplied to the cylinders. The acceleration signal generating circuit may include a low temperature compensating unit comprising a thermistor and adapted to further enrich the air-fuel mixture for acceleration during the warming-up process. A starting injection valve may be actuated for acceleration purposes in response to the first acceleration signal.
Inventors
- 👤 Shigeo Aono
- 👤 Nobuzi Manaka
- 👤 Tokuichi Inagaki
- 👤 Yasuo Nakajima
- 👤 Yukihiro Etoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:15
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/3094; F02D41/02; F02D41/04; F02D41/06; F02D41/068
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
326 words
An acceleration actuating device for a fuel injection system of an internal combustion engine having a throttle valve comprising, in combination, electric means for producing a voltage signal dependent upon the position of said throttle valve; a first electric circuitry having a switching transistor and being electrically connected to said electric means; said first electric circuitry being responsive to said voltage signal for producing a first acceleration signal; a second electric circuitry electrically connected to said electric means and to said first electric circuitry through said switching transistor, said second electric circuitry being responsive to said voltage signal and to a signal received from said first electric circuitry through action of said switching transistor for producing a variable second acceleration signal; a triggering device driven by said engine for producing a pulse signal with a repetition rate proportional to the speed of said engine; a computer circuit electrically connected to said triggering device and to said second electric circuitry, said computer circuit being responsive to said pulse signal and to said second acceleration signal for producing an injection pulse with a width dependent thereupon; an injection valve actuating circuit electrically connected to each of said computer circuit, said engine driven triggering device and said first electric circuitry, said injection valve actuating circuit being responsive to said injection pulse, to said pulse signal and to said first acceleration signal for producing an injection valve actuation signal; said injection valve actuation signal from said first acceleration signal being separate from the injection valve actuation signal produced by said pulse signal and said injection pulse an injection valve mounted in an engine intake manifold, and a fuel injection nozzle controlled by said injection valve, said injection valve being electrically connected to said injection valve actuating circuit and responsive to said injection valve actuation signal to cause fuel injection into a cylinder of said engine for a period of time corresponding to the width of said injection valve actuatioN signal.
Claim 2
Dependent Claim
326 words
An acceleration actuating device for a fuel injection system of an internal combustion engine having a throttle valve comprising, in combination, electric means for producing a voltage signal dependent upon the position of said throttle valve; a first electric circuitry having a switching transistor and being electrically connected to said electric means; said first electric circuitry being responsive to said voltage signal for producing a first acceleration signal; a second electric circuitry electrically connected to said electric means and to said first electric circuitry through said switching transistor, said second electric circuitry being responsive to said voltage signal and to a signal received from said first electric circuitry through action of said switching transistor for producing a variable second acceleration signal; a triggering device driven by said engine for producing a pulse signal with a repetition rate proportional to the speed of said engine; a computer circuit electrically connected to said triggering device and to said second electric circuitry, said computer circuit being responsive to said pulse signal and to said second acceleration signal for producing an injection pulse with a width dependent thereupon; an injection valve actuating circuit electrically connected to each of said computer circuit, said engine driven triggering device and said first electric circuitry, said injection valve actuating circuit being responsive to said injection pulse, to said pulse signal and to said first acceleration signal for producing an injection valve actuation signal; said injection valve actuation signal from said first acceleration signal being separate from the injection valve actuation signal produced by said pulse signal and said injection pulse an injection valve mounted in an engine intake manifold, and a fuel injection nozzle controlled by said injection valve, said injection valve being electrically connected to said injection valve actuating circuit and responsive to said injection valve actuation signal to cause fuel injection into a cylinder of said engine for a period of time corresponding to the width of said injection valve actuatioN signal.
Claim 3
Dependent Claim
79 words
An acceleration actuating device according to claim 1, wherein said engine has an accelerator pedal which is associated with said throttle valve, and wherein said electric means is an oscillator-type throttle valve position detector and includes an oscillation circuit with a fixed oscillation frequency, the output of said oscillation circuit being coupled to a d.c. conversion circuit and the degree of the coupling being varied by a shielding plate which moves in response to displacement of said accelerator pedal.
Claim 4
Dependent Claim
79 words
An acceleration actuating device according to claim 1, wherein said first electric circuitry includes a first differentiator consisting of a first capacitor and a first resistor and receiving said voltage signal; a Schmidt circuit electrically connected to said first differentiator and an astable multivibrator electrically connected to said Schmidt circuit through said switching transistor, said astable multivibrator serving to oscillate so as to produce said first acceleration signal when said switching transistor is rendered conductive by said Schmidt circuit.
Claim 5
Dependent Claim
248 words
An acceleration actuating device according to claim 1, wherein said second electric circuitry includes a second differentiator consisting of a second capacitor and a second resistor and receiving said voltage signal; a first transistor connected at its base to said Schmidt circuit to receive said signal from said first electric circuitry; an integrator circuit consisting of a third capacitor and a third resistor connected in series to the emitter of said first transistor; a second transistor connected at its base to said third capacitor and said third resistor, said first transistor conducting so as to cause said third capacitor to charge when the input voltage to said Schmidt circuit is above its threshold level and when said input voltage is below said threshold level, said first transistor being rendered nonconductive to cause said third capacitor to discharge so as to result in variation in the voltage at the emitter of said second transistor, the emitter voltage being said second acceleration signal, and wherein said second electric circuitry further includes a third transistor which is normally conducting, said third transistor being connected to said second differenciator; a fourth transistor connected at its base to the collector of said third transistor, at its collector to the base of said second transistor and having its emitter grounded, said third transistor being rendered nonconductive when said voltage signal applied to said second differentiator is below a predetermined level, whereby said fourth transistor is rendered conductive causing instant discharge of said third capacitor.
Claim 6
Dependent Claim
125 words
An acceleration actuating device according to claim 1, wherein said computer circuit includes a fourth capacitor connected to said triggering device; a first diode connected to said fourth capacitor; a blocking oscillator connected to said fourth capacitor; a blocking oscillator connected to said first diode; an engine intake manifold pressure sensor communicating with the intake manifold and adopted to transmit a signal indicating intake pressure; a fifth transistor connected to said blocking oscillator; and a fifth capacitor on a line connecting said diode to said fifth transistor said second acceleration signal being fed to said blocking oscillator through a sixth transistor and a second diode to produce an injection pulse with a width dependent on intake manifold pressure and repetition rate dependent of engine speed.
Claim 7
Dependent Claim
147 words
An acceleration actuating device according to claim 1, wherein said injection valve actuating circuit includes seventh, eighth and ninth transistors of the same type and a tenth transistor of a different type, said seventh transistor receiving at its base said injection pulse, said first acceleration pulse, a starting and warm-up signal at its collector and said pulse repetition rate signal, the collector of said seventh transistor being connected to the baSe of said eighth transistor, the collector of which is connected to the base of said ninth transistor, the collector of which is connected to the base of said tenth transistor, said seventh, eighth and ninth transistors being grounded at their emitters, and a solenoid connected between said tenth transistor and ground for causing said injection valve to open for fuel injection for said period of time corresponding to the width of said injection valve actuation signal.
Claim 8
Dependent Claim
121 words
An acceleration actuating device according to claim 3, further including a temperature compensating unit consisting of a thermistor for sensing the engine temperature and an eleventh transistor connected to said thermistor at the base thereof, said eleventh transistor being connected at its collector to a point between a fourth resistor and a fifth transistor connected to the output of said astable multivibrator through a capacitor said thermistor having a relatively high resistance, when the engine is cold, to increase the potential at the base of said eleventh transistor whereby said eleventh transistor is rendered conductive to decrease the potential at the point between said fourth and fifth resistors for thereby increasing the width of the pulse generated by said astable multivibrator.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |