US3910240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically controlled fuel injection system
Assignee: Denso Corp
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Filing: 1973-09-28
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Granted: 1975-10-07
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Expires: 1993-09-28
Abstract
Abstract In an electronically controlled fuel injection system comprising an electromagnetically operable fuel injection valve disposed in each of the inlet pipes for engine cylinders, wherein the injection valves and the exhaust pipes are divided into two groups, and an oxygen concentration detector is provided in the exhaust pipe in one of the two groups, whereby a voltage generated by the detector in accordance with the oxygen concentration is applied to an electronic control unit to control the electric pulse for the injection valve in the group corresponding to the exhaust pipe which is provided with the detector, while a voltage corresponding to an operating parameter of the engine is applied to the electronic control unit and the electric pulses for the injection valves in the other group are multiplied by a value corresponding to the operating parameter of the engine and the resultant electric pulses are supplied to the injection valves in the other group.
Inventors
- 👤 Norio Omori
- 👤 Katsuhiko Oiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:02
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1473; F02D41/1475
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
215 words
An electronically controlled fuel injection system for an internal combustion engine comprising: an electromagnetically operable fuel injection valve provided in the inlet pipe for each cylinder, and an electronic control unit for controlling the duration of the opening of said injection valves with electric pulses having a time width corresponding to an operating parameter of an engine and in synchronism with the rotation of a crankshaft of said engine, wherein said injection valves are divided into two groups, said cylinders and exhaust pipes for said cylinders are divided into two groups corresponding to said two groups of said injection valves, and an oxygen concentration detector is provided in said exhaust pipe in one of said two groups including at least one of said cylinders, whereby a voltage generated by said detector in accordance with the oxygen concentration in exhaust gases is applied to said electronic control unit to control an electric pulse applied to said injection valve corresponding to said exhaust pipe provided with said detector, while a voltage corresponding to an operating parameter of said engine is applied to said electronic control unit and an electric pulse obtained by multiplying said firstmentioned electric pulse by a value corresponding to said operating parameter of said engine is applied to the rest of said injection valves.
Claim 2
Dependent Claim
215 words
An electronically controlled fuel injection system for an internal combustion engine comprising: an electromagnetically operable fuel injection valve provided in the inlet pipe for each cylinder, and an electronic control unit for controlling the duration of the opening of said injection valves with electric pulses having a time width corresponding to an operating parameter of an engine and in synchronism with the rotation of a crankshaft of said engine, wherein said injection valves are divided into two groups, said cylinders and exhaust pipes for said cylinders are divided into two groups corresponding to said two groups of said injection valves, and an oxygen concentration detector is provided in said exhaust pipe in one of said two groups including at least one of said cylinders, whereby a voltage generated by said detector in accordance with the oxygen concentration in exhaust gases is applied to said electronic control unit to control an electric pulse applied to said injection valve corresponding to said exhaust pipe provided with said detector, while a voltage corresponding to an operating parameter of said engine is applied to said electronic control unit and an electric pulse obtained by multiplying said firstmentioned electric pulse by a value corresponding to said operating parameter of said engine is applied to the rest of said injection valves.
Claim 3
Dependent Claim
164 words
An electronically controlled fuel injection system for an internal combustion engine comprising an electromagnetically operable fuel injection valves provided in the inlet pipe for each cylinder, means for detecting oxygen concentration in the exhaust pipe, an electronic control unit connected to said electromagnetically operable fuel injection valves and to an engine parameter sensing means for controlling the duration of the opening of said injection valves in response to operating parameters of the engine and in synchronism with the engine rotation, said electronic control unit including: first means connected to said oxygen concentration detecting means for providing an electric pulse signal of a first time width in response to the oxygen concentration and second means connected to said oxygen concentration detecting means and to said engine parameter sensing means for providing an electric pulse signal of a second time width, said second time width being k times said first time width, k being in the range of 0.7 to 1.3, whereby air-fuel ratio is selected.
Claim 4
Dependent Claim
164 words
An electronically controlled fuel injection system for an internal combustion engine comprising an electromagnetically operable fuel injection valves provided in the inlet pipe for each cylinder, means for detecting oxygen concentration in the exhaust pipe, an electronic control unit connected to said electromagnetically operable fuel injection valves and to an engine parameter sensing means for controlling the duration of the opening of said injection valves in response to operating parameters of the engine and in synchronism with the engine rotation, said electronic control unit including: first means connected to said oxygen concentration detecting means for providing an electric pulse signal of a first time width in response to the oxygen concentration and second means connected to said oxygen concentration detecting means and to said engine parameter sensing means for providing an electric pulse signal of a second time width, said second time width being k times said first time width, k being in the range of 0.7 to 1.3, whereby air-fuel ratio is selected.
Claim 5
Dependent Claim
151 words
An electronically controlled fuel injection system for an internal combustion engine as claimed in claim 2, wherein said first means comprises: a contact unit for providing fuel start signals in synchronizm with the rotation of the engine, a reshaping circuit connected to said contact unit for reshaping said fuel start signals, a voltage regulator circuit for providing a constant voltage, an integrator circuit connected to said reshaping circuit and said voltage regulator circuit for integrating the constant voltage of said voltage regulator with the time interval determined by the reshaped signal, a comparison circuit connected to said integrator circuit and said oxygen concentration detecting means for providing a signal when the output of the integrator circuit reaches the output of said oxygen concentration detecting means, and a valve actuating circuit connected to said reshaping circuit for controlling said fuel injection valves in response to the output signal of said comparison circuit.
Claim 6
Dependent Claim
138 words
An electronically controlled fuel injection system for an internal combustion engine comprising an electromagnetically operable fuel injection valves provided in the inlet pipe for each cylinder, means for detecting oxygen concentration in an exhaust pipe, and an electronic control unit connected to said electromagnetically operable fuel injection valves, said oxygen concentration detecting means and to an engine parameter sensing means for controlling fuel injection, wherein said electronic control unit comprises first means connected to said oxygen concentration detecting means for controlling fuel amount injected into a first group of cylinders, second means connected to said engine parameter seNsing means for controlling fuel amount injected into a second group of cylinders in a different manner from said first means, said oxygen concentration detecting means being disposed in the exhaust pipe which solely belongs to said first group of cylinders.
Claim 7
Dependent Claim
138 words
An electronically controlled fuel injection system for an internal combustion engine comprising an electromagnetically operable fuel injection valves provided in the inlet pipe for each cylinder, means for detecting oxygen concentration in an exhaust pipe, and an electronic control unit connected to said electromagnetically operable fuel injection valves, said oxygen concentration detecting means and to an engine parameter sensing means for controlling fuel injection, wherein said electronic control unit comprises first means connected to said oxygen concentration detecting means for controlling fuel amount injected into a first group of cylinders, second means connected to said engine parameter seNsing means for controlling fuel amount injected into a second group of cylinders in a different manner from said first means, said oxygen concentration detecting means being disposed in the exhaust pipe which solely belongs to said first group of cylinders.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |