Patent US3842811A successfully refreshed from Google Patents.
US3842811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric fuel injection control system for internal combustion engines
Assignee: Toyota Motor Corp
•
Filing: 1972-12-08
•
Granted: 1974-10-22
•
Expires: 1992-12-08
Abstract
Abstract In internal combustion engines, where the fuel injection valves are electromagnetically operated, at the time of engine acceleration the amount of fuel injected is increased by converting sudden changes in such parameters as the negative pressure in the engine intake manifold into corresponding changes of the mechanical type, such as by the displacement of a diaphragm, according to which mechanical changes an electric fuel injection control is operated. Thus, a delay time is involved, resulting in an insufficient response characteristic. In the specification, there is disclosed an electric fuel injection system for internal combustion engines, comprising; a means to generate electric signals corresponding to the speed of motion of the throttle of the engine or particularly when the speed of the throttle motion exceeds a predetermined value; and a means to increase the amount of fuel delivered for acceleration by so controlling fuel injection valves upon reception of the signal from the first means.
Inventors
- 👤 K Shinoda
- 👤 K Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:07
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
330 words
An electrical fuel injection control system for an internal combustion engine having electromagnetic means for operating fuel injection valves of the engine and operative to inject fuel in response to injection pulses each having a pulse width varying as a function of parameters indicative of the condition of said engine comprising: a permanent magnet signal generator having a permanent magnet linked to the throttle of the engine and an armature coil electromagnetically coupled with said permanent magnet for producing an output voltage responsive to the movement of said permanent magnet; first circuit means connected between said armature coil and second circuit means for rectifying said output voltage of said armature coil and supplying a current depending on said rectified output voltage to said second circuit means when said output voltage, exceeds a predetermined level; said second circuit means having a capacitor adaptable to store electricity by said current supplied thereto and a resistor adaptable to discharge said stored electricity for producing a voltage variable signal with discharging of said stored electricity; pressure signal generating means responsive to the pressure of engine intake manifold of said engine for generating a voltage signal indicative of said pressure; third circuit means connected to said second circuit means and said pressure signal generating means and including an operational amplifier to add the signal derived from said second circuit means to the signal derived from said pressure signal generating means to produce a signal which varies as a function of the superposition of said voltage variable signal produced by said second circuit means and said voltage signal of said pressure signal generating means; fourth circuit means connected to said third circuit means for producing a fuel injection pulse signal whose pulse width is determined by said signal produced by said third circuit means; fifth circuit means connected to said fourth circuit means and said electromagnetic means for driving said electromagnetic means for an interval corresponding to the pulse width of said fuel injection pulse signal.
Claim 2
Dependent Claim
330 words
An electrical fuel injection control system for an internal combustion engine having electromagnetic means for operating fuel injection valves of the engine and operative to inject fuel in response to injection pulses each having a pulse width varying as a function of parameters indicative of the condition of said engine comprising: a permanent magnet signal generator having a permanent magnet linked to the throttle of the engine and an armature coil electromagnetically coupled with said permanent magnet for producing an output voltage responsive to the movement of said permanent magnet; first circuit means connected between said armature coil and second circuit means for rectifying said output voltage of said armature coil and supplying a current depending on said rectified output voltage to said second circuit means when said output voltage, exceeds a predetermined level; said second circuit means having a capacitor adaptable to store electricity by said current supplied thereto and a resistor adaptable to discharge said stored electricity for producing a voltage variable signal with discharging of said stored electricity; pressure signal generating means responsive to the pressure of engine intake manifold of said engine for generating a voltage signal indicative of said pressure; third circuit means connected to said second circuit means and said pressure signal generating means and including an operational amplifier to add the signal derived from said second circuit means to the signal derived from said pressure signal generating means to produce a signal which varies as a function of the superposition of said voltage variable signal produced by said second circuit means and said voltage signal of said pressure signal generating means; fourth circuit means connected to said third circuit means for producing a fuel injection pulse signal whose pulse width is determined by said signal produced by said third circuit means; fifth circuit means connected to said fourth circuit means and said electromagnetic means for driving said electromagnetic means for an interval corresponding to the pulse width of said fuel injection pulse signal.
Claim 3
Dependent Claim
262 words
An electrical fuel injection control system for an internal combustion engine comprising: a signal generator having a member movable in response to the operation of the throttle and means responsive to the movement of said member for producing a first signal voltage indicative of the moving speed of the throttle; first circuit means having a rectifier connected to said signal generator, a capacitor connected to said rectifier to store electricity supplied thereto through said rectifier by said first signal voltage of said signal generator, and a variable resistor connected in parallel with said capacitor for discharging said stored electricity, said rectifier having a predetermined forward breakdown voltage whereby said first signal voltage is applied to said capacitor only when said signal first voltage exceeds said forward breakdown voltage; means for detecting the condition of the engine for producing a second signal voltage indiCative of at least one predetermined parameter of the condition of said engine; means connected to said capacitor of said signal generator and said detecting means and including an amplifier having an operational amplifier for adding the signal derived from said signal generator to the signal derived from said detecting means; means connected to said operational amplifier for generating a fuel injection signal whose pulse width is controlled as a function of the addition by said operational amplifier; and means connected to said fuel injection pulse signal generating means and having electromagnetic valves for injecting fuel into cylinders of the engine in a predetermined sequence for an interval corresponding to said controlled pulse width of said fuel injection pulse signal.
Claim 4
Dependent Claim
262 words
An electrical fuel injection control system for an internal combustion engine comprising: a signal generator having a member movable in response to the operation of the throttle and means responsive to the movement of said member for producing a first signal voltage indicative of the moving speed of the throttle; first circuit means having a rectifier connected to said signal generator, a capacitor connected to said rectifier to store electricity supplied thereto through said rectifier by said first signal voltage of said signal generator, and a variable resistor connected in parallel with said capacitor for discharging said stored electricity, said rectifier having a predetermined forward breakdown voltage whereby said first signal voltage is applied to said capacitor only when said signal first voltage exceeds said forward breakdown voltage; means for detecting the condition of the engine for producing a second signal voltage indiCative of at least one predetermined parameter of the condition of said engine; means connected to said capacitor of said signal generator and said detecting means and including an amplifier having an operational amplifier for adding the signal derived from said signal generator to the signal derived from said detecting means; means connected to said operational amplifier for generating a fuel injection signal whose pulse width is controlled as a function of the addition by said operational amplifier; and means connected to said fuel injection pulse signal generating means and having electromagnetic valves for injecting fuel into cylinders of the engine in a predetermined sequence for an interval corresponding to said controlled pulse width of said fuel injection pulse signal.
Claim 5
Dependent Claim
21 words
An electrical fuel injection control system according to claim 1, wherein said fourth circuit means comprises a saw tooth wave generator.
Claim 6
Dependent Claim
23 words
An electrical fuel injection control system according to claim 2, wherein said fuel injection signal generating means comprises a saw tooth wave generator.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |