US3596640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection systems for internal combustion engines
Assignee: AE PLC
•
Filing: 1969-04-01
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Granted: 1971-08-03
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Expires: 1989-04-01
Abstract
Abstract This invention relates to fuel injection systems for internal combustion engines of the kind in which fuel is fed to an engine through one or more electrically operated fuel injection valves or injectors which are opened intermittently. The invention provides means for controlling the injection valve or valves under engine overrun conditions, and also means for controlling the fuel pressure to the injection valves in accordance with the engine induction passage pressure.
Inventors
- 👤 George V Bloomfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:08
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/02; F02D; F02D17/00; F02D17/04; F02D41/00; F02D41/008; F02D41/0087; F02D41/30; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0261; F02D2700/0266
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
A fuel injection system for an internal combustion engine, comprising at least two electromagnetically operable fuel injection valve and a pulse generator for intermittently energizing each valve in timed relation to the engine-operaTing cycle, wherein there is provided an overrun control circuit comprising means responsive to an engine-operating parameter indicative of an engine-overrun condition and an electronic switching circuit connected to be operated by the overrunresponsive means, the overrun switching circuit being connected to the pulse generator so as to prevent a constant portion, but not all, or the valve energizations throughout the overrun condition.
Claim 2
Dependent Claim
95 words
A fuel injection system for an internal combustion engine, comprising at least two electromagnetically operable fuel injection valve and a pulse generator for intermittently energizing each valve in timed relation to the engine-operaTing cycle, wherein there is provided an overrun control circuit comprising means responsive to an engine-operating parameter indicative of an engine-overrun condition and an electronic switching circuit connected to be operated by the overrunresponsive means, the overrun switching circuit being connected to the pulse generator so as to prevent a constant portion, but not all, or the valve energizations throughout the overrun condition.
Claim 3
Dependent Claim
70 words
A system as claimed in claim 1, including a plurality of fuel injection valves wherein the fuel injection valves are arranged in at least two groups and wherein means are provided which operate in response to an engine-operating parameter indicative of an engine-overrun condition in order to prevent energization of the valve or valves of at least one such group (but not of all the groups) under said overrun condition.
Claim 4
Dependent Claim
24 words
A system as claimed in claim 1, wherein the engine-operating parameter is the induction passage pressure downstream of the throttle valve of the engine.
Claim 5
Dependent Claim
25 words
A system as claimed in claim 1, wherein the engine-operating parameter is the rotational speed of the engine when the engine throttle valve is closed.
Claim 6
Dependent Claim
95 words
A system as claimed in claim 2, including a separate pulse generator for each group of fuel injection valves, a trigger device for triggering the pulse generators in timed relation to the engine-operating cycle, means for feeding one or more control signals to the pulse generators, which control signals vary as a function of parameters of engine operation in order to control the duration of the output pulses from the pulse generators and means for feeding the output pulses from each pulse generator to energize the injection valve or valves associated with that pulse generator.
Claim 7
Dependent Claim
43 words
A system as claimed in claim 5, wherein an electronic switching device is connected to at least one pulse generator, and means for controlling said switching device during the engine overrun conditions to inhibit the operation of said at least one pulse generator.
Claim 8
Dependent Claim
35 words
A system as claimed in claim 6, including a pressure-responsive transducer arranged in the induction passage of the engine downstream of the engine throttle valve, which transducer controls the electronic operation of the switching device.
Claim 9
Dependent Claim
43 words
A system as claimed in claim 6, including a throttle-operated switch is closed when the engine throttle valve is closed and which then passes a signal indicative of the rotational speed of the engine to control the operation of the electronic switching device.
Claim 10
Dependent Claim
68 words
A system as claimed in claim 6, for a four-cylinder internal combustion engine having one fuel injection valve for each cylinder, wherein the injection valves are divided into two groups each having two valves and two pulse generators are provided each of which supplies the energizing pulses to a group of two injection valves, and wherein an electronic switching device is connected to one of the pulse generators.
Claim 11
Dependent Claim
67 words
A fuel injection system as claimed in claim 1, including at least one electrically operated fuel injection valve which is opened intermittently, wherein means are provided which are responsive to an engine-operating parameter indicative of an engine-overrun condition and which operate to open the valve or valves only once every nth cycle of engine operation, where n is a number greater than one, under said overrun conditions.
Claim 12
Dependent Claim
24 words
A system as claimed in claim 10, wherein the engine parameter is the induction passage pressure downstream of the throttle valve of the engine.
Claim 13
Dependent Claim
25 words
A system as claimed in claim 10, wherein the engine parameter is the rotational speed of the engine when the engine throttle valve is closed.
Claim 14
Dependent Claim
59 words
A system as claimed in claim 10, including at least one pulse generator producing pulses for energizing the fuel injection valve or valves and which is controlled by at least one control signal varying as a function of a parameter of engine operation to control the duration of the output pulses fed to the fuel iNjection valve or valves.
Claim 15
Dependent Claim
76 words
A system as claimed in claim 13, wherein at least one pulse generator is triggered by a trigger device which operates in timed relation with the operating cycle of the engine, and an electronic switching device is connected to the or each pulse generator and is controlled during the engine-overrun condition so that it permits the operation of the or each pulse generator only in response to every nth trigger pulse to trigger the pulse generator.
Claim 16
Dependent Claim
47 words
A system as claimed in claim 14, wherein there is provided a plurality of fuel injection valves divided into at least two groups and a separate pulse generator is provided to energize each group of valves, a separate electronic switching device being connected to each pulse generator.
Claim 17
Dependent Claim
35 words
A system as claimed in claim 14, wherein operation of the or each electronic switching device is controlled by a pressure-responsive transducer arranged in the induction passage of the engine downstream of the throttle valve.
Claim 18
Dependent Claim
41 words
A system as claimed in claim 14, including a throttle-operated switch which is closed when the engine throttle valve is closed and which passes a signal generated under engine-overrun conditions to control the operation of the or each electronic switching device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |