US3827415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel supply device for internal combustion engines
Assignee: Toyota Motor Corp
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Filing: 1971-10-07
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Granted: 1974-08-06
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Expires: 1991-10-07
Abstract
Abstract A fuel supply device for internal combustion engines, comprising a rotating pulse generating means and a fluid calculating means having a pulse-width modulating means and a fuel injection means. The rotating pulse generating means comprises a pulse generator and a fluid element for shaping wave forms and utilizes liquid fuel as a medium to produce pulse signal conforming to the fuel injection timing in accordance with the number of engine revolution. The pulse-width modulating means comprises a variable liquid resistor adapted to throttle the pulse signal in conformity with the internal pressure in an intake manifold, and further comprises a fluid element for controlling pulse width which is set by the pulse signal and is reset by the throttled signal obtained from the variable liquid resistor. Thus, the pulse-width modulating means is adapted to modulate the pulse signal conforming to the fuel injection timing to provide a control pulse having a width which better corresponds with the fuel injection timing. The fuel injection means comprises a fluid element for fuel injection and supplies fuel to the downstream side of a throttle valve in the intake manifold in accordance with the control pulse signal having the modulated pulse width.
Inventors
- 👤 T Makino
- 👤 S Ishii
- 👤 R Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:25
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/002; Y; Y10; Y10S; Y10S123/00; Y10S123/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
In an internal combustion engine of the type wherein the amount of fuel injected into the intake air is determined by the number of engine revolutions per unit time and by the engine load, a fuel supply system comprising; pulse generating means displaceable at a rate corresponding to the number of revolutions per unit time of said engine and adapted to receive liquid fuel, said pulse generating means generating a fluid pulse signal in synchronism with said engine revolutions; a variable liquid resistor having a resistance corresponding to the pressure within the intake manifold of said engine, said resistor producing a set pulse signal when it receives said fluid pulse signal from said pulse generating means and a reset pulse signal a predetermined interval after said set pulse signal is produced, said interval corresponding to the resistance of said liquid resistor; and fluid element means coupled to said liquid resistor and adapted to receive liquid fuel, said fluid element injecting said fuel into the intake air during said predetermined interval.
Claim 2
Dependent Claim
170 words
In an internal combustion engine of the type wherein the amount of fuel injected into the intake air is determined by the number of engine revolutions per unit time and by the engine load, a fuel supply system comprising; pulse generating means displaceable at a rate corresponding to the number of revolutions per unit time of said engine and adapted to receive liquid fuel, said pulse generating means generating a fluid pulse signal in synchronism with said engine revolutions; a variable liquid resistor having a resistance corresponding to the pressure within the intake manifold of said engine, said resistor producing a set pulse signal when it receives said fluid pulse signal from said pulse generating means and a reset pulse signal a predetermined interval after said set pulse signal is produced, said interval corresponding to the resistance of said liquid resistor; and fluid element means coupled to said liquid resistor and adapted to receive liquid fuel, said fluid element injecting said fuel into the intake air during said predetermined interval.
Claim 3
Dependent Claim
100 words
A fuel supply system as defined by claim 1 wherein said variable liquid resistor comprises a throttle portion including a liquid fuel passing groove connecting inlet and outlet thirty five chambers and means for changing the area of said fluid passing groove in response to the pressure within the intake manifold of said engine, the inlet chamber of said variable liquid resistor being coupled to the output of said pulse generating means; and fluid volume means coupled to said outlet chamber for generating a saw-tooth pressure wave having a time constant corresponding to the area of said fluid passing groove.
Claim 4
Dependent Claim
110 words
A fuel supply system as defined by claim 1 wherein said fluid element means comprises a pulse-width control fluid element adapted to receive said liquid fuel and having first and second inlet port means connected to the inlet and outlet chambers of said liquid resistor respectively, said pulse-width control element further having outlet port means; and a fuel-injection fluid element adapted to receive said liquid fuel and having control port means connected to the outlet port means of said pulse-width control element, the output of said fuel-injection fluid element injecting fuel into said intake manifold in response to the signals at the output port means of said pulse-width control element.
Claim 5
Dependent Claim
259 words
A fuel supply system as Defined by claim 1 wherein said pulse generating means comprises a pulse generator rotatable at a rate corresponding to the number of engine revolutions per unit time; and a wave-form shaping fluid element receiving said liquid fuel and having an input coupled to the output of said pulse generator, the output of said wave-form shaping fluid element comprising said fluid pulse signals; said variable liquid resistor comprises a throttle portion including a liquid fuel passing groove connecting inlet and outlet chambers and means for changing the area of said fluid passing groove in response to the pressure with the intake manifold of said engine, the inlet chambers of said variable liquid resistor being coupled to the output of said pulse generating means; and fluid volume means coupled to said outlet chamber for generating a saw-tooth pressure wave having a time constant corresponding to the area of said fluid passing groove; and said fluid element means comprises a pulse-width control fluid element adapted to receive said liquid fuel and having set and reset inlet ports connected respectively to the inlet chamber of said liquid resistor and to said fluid volume means, said pulse-width control element further having first and second output ports; and a fuel-injection fluid element adapted to receive said liquid fuel and having first and second input ports connected to the output ports of said pulse-width control element the output of said fuel injection fluid element injecting fuel into said intake manifold in response to the output signal from said pulse-width control element.
Claim 6
Dependent Claim
34 words
A fuel supply system as defined by claim 4 which further comprises a throttle valve coupled to the intake manifold of said engine, said throttle valve being further coupled to said fluid volume means.
Claim 7
Dependent Claim
43 words
A fuel supply system as defined by claim 4 wherein said variable liquid resistor is further provided with means for preventing fluid from reaching the set inlet port of said pulse-width control fluid element when said engine is operating under a light load.
Claim 8
Dependent Claim
67 words
A fuel supply system as defined in claim 1 wherein said pulse generating means comprises, a pulse generator rotatable at a rate corresponding to the number of engine revolutions per unit time and a wave-form shaping fluid element receiving said liquid fuel and having an input coupled to the output of said pulse generator, the output of said wave-form shaping fluid element comprising said fluid pulse signals.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |