US4232647A
Expired / Lapsed
US
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Control circuit for diesel injection system
Assignee: Bendix Corp
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Filing: 1978-11-13
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Granted: 1980-11-11
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Expires: 1998-11-13
Abstract
Abstract A fuel control system for an electronically controlled fuel injected internal combustion engine, whereby fuel is injected into the cylinders for a fixed number of degrees with respect to the crankshaft rotation. A trigger pulse is fed into a tachometer circuit (32) giving a DC ramp output with respect to speed. A portion of this ramp signal is fed into a monostable circuit (31) whose output pulse duration is now speed dependent and remains constant in degrees of engine crankshaft as the speed of the crankshaft increases. By adjusting the slope of DC ramp output fed into the monostable circuit (31), the fuel "on" time may be set to any fixed number of engine crankshaft degrees desired for a particular engine.
Inventors
- 👤 Howard E. Van Siclen, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:20
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/02; F02D41/0205; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
112 words
A system for controlling a solenoid operated fuel injector of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said circuit comprising: first means for generating a trigger pulse for each operating cycle of said engine; and second means, responsive to each trigger pulse, for generating an energizing pulse to energize the injector solenoid for each operating cycle of the engine, said second means including: means for limiting the duration of said energizing pulse to a fixed number of degrees of engine crankshaft rotation over a preselected range of rotational speeds of said engine crankshaft, said limiting means consisting of electronic circuitry.
Claim 2
Independent Claim
112 words
A system for controlling a solenoid operated fuel injector of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said circuit comprising: first means for generating a trigger pulse for each operating cycle of said engine; and second means, responsive to each trigger pulse, for generating an energizing pulse to energize the injector solenoid for each operating cycle of the engine, said second means including: means for limiting the duration of said energizing pulse to a fixed number of degrees of engine crankshaft rotation over a preselected range of rotational speeds of said engine crankshaft, said limiting means consisting of electronic circuitry.
Claim 3
Dependent Claim
117 words
The system for controlling a solenoid operated fuel injector as recited in claim 1 wherein said means for limiting the duration of said energizing pulse comprises: means for generating a first signal, the magnitude of which increases as the rotational speed of the engine crankshaft increases; and a monostable multivibrator responsive to each trigger pulse for providing a control pulse, said monstable multivibrator having means for receiving said first signal to control the duration of said control pulse, whereby said control pulse duration is controlled by said first signal to provide a control pulse duration which is a fixed number of degrees of engine crankshaft rotation over a preselected range of rotational speeds of said engine crankshaft.
Claim 4
Dependent Claim
62 words
The circuit recited in claim 1 wherein said means for limiting the duration of said energizing pulse further includes: means for providing a pulse having a fixed duration in degrees of engine crankshaft rotation for each of a plurality of ranges of engine crankshaft speeds and wherein the fixed duration of said pulse is different for each of said different speed ranges.
Claim 5
Dependent Claim
62 words
The circuit recited in claim 2 wherein said means for limiting the duration of said energizing pulse further includes: means for providing a pulse having a fixed duration in degrees of engine crankshaft rotation for each of a plurality of ranges of engine crankshaft speeds and wherein the fixed duration of said pulse is different for each of said different speed ranges.
Claim 6
Dependent Claim
78 words
The system for controlling a solenoid operated fuel injector as recited in claim 1, 2, 3 or 4 wherein said means for generating a trigger pulse for each operating cycle of the engine includes means for initiating the trigger pulse at the same specific engine crankshaft angle for each operating cycle of said engine; and means for automatically varying the initiation of said trigger pulse from said specific engine crankshaft as a function of an engine operating parameter.
Claim 7
Dependent Claim
33 words
The system for controlling a solenoid operated fuel injector as recited in claim 1, 2, 3 or 4 including: means for preventing the speed of the engine crankshaft from exceeding a predetermined speed.
Claim 8
Independent Claim
214 words
A system for controlling a solenoid operated fuel injector for an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising: means for generating a trigger pulse for each operating cycle of said engine; means for generating a first signal pulse in response to each trigger pulse over a preselected range of engine crankshaft rotational speeds, said first signal pulse having a duration in degrees of crankshaft angle rotation that is fixed; means for generating a second signal pulse in response to each trigger pulse over said preselected range of engine crankshaft rotational speeds, said second signal pulse having a duration in degrees of engine crankshaft rotation that varies as a function of the rotational speed of the engine crankshaft; and means for generating an energizing pulse to energize said fuel injector solenoid in response to each trigger pulse, said pulse generating means including: means responsive to each trigger pulse, for comparing the duration of said first signal pulse to the duration of said second signal pulse and generating an energizing pulse, having a duration equal to the shorter duration of said compared pulses, whereby said fuel injector is controlled in relation to the operating cycle of the engine by said energizing pulse.
Claim 9
Independent Claim
214 words
A system for controlling a solenoid operated fuel injector for an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising: means for generating a trigger pulse for each operating cycle of said engine; means for generating a first signal pulse in response to each trigger pulse over a preselected range of engine crankshaft rotational speeds, said first signal pulse having a duration in degrees of crankshaft angle rotation that is fixed; means for generating a second signal pulse in response to each trigger pulse over said preselected range of engine crankshaft rotational speeds, said second signal pulse having a duration in degrees of engine crankshaft rotation that varies as a function of the rotational speed of the engine crankshaft; and means for generating an energizing pulse to energize said fuel injector solenoid in response to each trigger pulse, said pulse generating means including: means responsive to each trigger pulse, for comparing the duration of said first signal pulse to the duration of said second signal pulse and generating an energizing pulse, having a duration equal to the shorter duration of said compared pulses, whereby said fuel injector is controlled in relation to the operating cycle of the engine by said energizing pulse.
Claim 10
Dependent Claim
53 words
A system recited in claim 7 wherein said means for generating a first signal pulse includes: means for providing a pulse having a fixed duration for each of a plurality of ranges of engine crankshaft speeds and wherein the fixed duration of said pulse is different for each of said different speed ranges.
Claim 11
Dependent Claim
108 words
The system recited in claim 7 or 8 wherein said means for generating said first signal pulse comprises: means for generating a ramp signal, the magnitude of which increases as the rotational speed of the engine crankshaft increases; and a monostable multivibrator responsive to each trigger pulse for providing a control pulse, said monostable multivibrator having means for receiving said ramp signal to control the duration of said control pulse, whereby said control pulse duration is controlled by said ramp signal to provide a control duration which is a fixed number of degrees of engine crankshaft rotation over a preselected range of rotational speeds of said engine crankshaft.
Claim 12
Independent Claim
97 words
A system for controlling a solenoid operated fuel injector of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising: means for generating a trigger pulse for each operating cycle of said engine; and signal pulse generating means responsive to each trigger pulse for generating a signal pulse to energize the injector solenoid for each operating cycle of the engine, said signal pulse having a different and fixed duration in engine crankshaft degrees for each of a plurality of speed ranges of said engine crankshaft.
Claim 13
Independent Claim
97 words
A system for controlling a solenoid operated fuel injector of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising: means for generating a trigger pulse for each operating cycle of said engine; and signal pulse generating means responsive to each trigger pulse for generating a signal pulse to energize the injector solenoid for each operating cycle of the engine, said signal pulse having a different and fixed duration in engine crankshaft degrees for each of a plurality of speed ranges of said engine crankshaft.
Claim 14
Dependent Claim
29 words
The system described in claim 10 including: means for limiting the duration of said signal pulse at predetermined engine crankshaft speeds within at least one of said speed ranges.
Claim 15
Dependent Claim
95 words
The circuit recited in claim 11 wherein the means for limiting the duration of said signal pulses includes: second pulse generating means responsive to said trigger pulses for generating pulses having a duration in degrees of engine crankshaft rotation which vary as a function of engine speed; and comparator means for comparing the duration of a pulse from said second pulse generating means to the duration of a pulse from said signal pulse generating means and providing an output pulse to said injector which has a duration equal to the shorter of the compared durations.
Claim 16
Dependent Claim
24 words
The system described in claim 12, including: means for limiting the duration of said second pulse at predetermined crankshaft speeds within said speed ranges.
Claim 17
Independent Claim
262 words
A system for controlling a solenoid operated fuel injector for an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising: means for generating a trigger pulse for each operating cycle of the engine; means for generating a reference signal pulse in response to each trigger pulse, said reference signal pulse having a first duration that corresponds to a first fixed number of engine crankshaft degrees over a first preselected range of engine crankshaft rotational speeds and a second duration that corresponds to a second and different fixed number of engine crankshaft degrees over a second and different preselected range of engine crankshaft rotational speeds; means for generating a control signal pulse in response to each trigger pulse over said first and second preselected ranges of engine crankshaft rotational speeds, said control pulse having a duration in engine crankshaft degrees of rotation that varies as a function of the rotational speed of the engine crankshaft; and means for generating an energizing pulse for said fuel injector solenoid in response to each trigger pulse to inject fuel into the engine for each operating cycle of the engine, said energizing pulse generating means including: means responsive to each trigger pulse for comparing the duration of a reference signal pulse to the duration of a control signal pulse and generating an energizing pulse, said energizing pulse having a duration equal to the shorter duration of said compared pulses, whereby when said energizing pulse is delivered to said fuel injector said fuel injector is energized.
Claim 18
Independent Claim
262 words
A system for controlling a solenoid operated fuel injector for an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising: means for generating a trigger pulse for each operating cycle of the engine; means for generating a reference signal pulse in response to each trigger pulse, said reference signal pulse having a first duration that corresponds to a first fixed number of engine crankshaft degrees over a first preselected range of engine crankshaft rotational speeds and a second duration that corresponds to a second and different fixed number of engine crankshaft degrees over a second and different preselected range of engine crankshaft rotational speeds; means for generating a control signal pulse in response to each trigger pulse over said first and second preselected ranges of engine crankshaft rotational speeds, said control pulse having a duration in engine crankshaft degrees of rotation that varies as a function of the rotational speed of the engine crankshaft; and means for generating an energizing pulse for said fuel injector solenoid in response to each trigger pulse to inject fuel into the engine for each operating cycle of the engine, said energizing pulse generating means including: means responsive to each trigger pulse for comparing the duration of a reference signal pulse to the duration of a control signal pulse and generating an energizing pulse, said energizing pulse having a duration equal to the shorter duration of said compared pulses, whereby when said energizing pulse is delivered to said fuel injector said fuel injector is energized.
Claim 19
Dependent Claim
127 words
The system for controlling a solenoid operated fuel injector as recited in claim 14 wherein said means for generating a signal pulse in response to each trigger pulse over said first and second preselected ranges of engine crankshaft rotational speeds includes: means for generating a first signal, the magnitude of which increases as the engine crankshaft increases; and a monostable multivibrator responsive to each trigger pulse for providing a control pulse, said monostable multivibrator having means for receiving said first signal to control the duration of said control pulse, whereby said control pulse duration is controlled by said first signal to provide a control pulse duration which is fixed number of degrees of engine crankshaft rotation over a preselected range of rotational speeds of said engine crankshaft.
Claim 20
Dependent Claim
74 words
The system for controlling a solenoid operated fuel injector as recited in claim 14 wherein said means for generating a trigger pulse for each operating cycle of the engine includes means for initiating the trigger pulse at the same specific engine crankshaft angle for each operating cycle of said engine; and means for automatically varying the initiation of said trigger pulse from said specific engine crankshaft angle as a function of engine crankshaft speed.
Claim 21
Dependent Claim
74 words
The system for controlling a solenoid operated fuel injector as recited in claim 15 wherein said means for generating a trigger pulse for each operating cycle of the engine includes means for initiating the trigger pulse at the same specific engine crankshaft angle for each operating cycle of said engine; and means for automatically varying the initiation of said trigger pulse from said specific engine crankshaft angle as a function of engine crankshaft speed.
Claim 22
Dependent Claim
69 words
The system as recited in claim 14, 15, 16, or 17 wherein the system includes a plurality of fuel injectors; a plurality of trigger pulses and energizing pulses, each equal to the number of cylinders in the engine and generated for each operating cycle of the engine; and means for distributing said energizing pulses in a predetermined sequence to the fuel injectors during each operating cycle of the engine.
Claim 23
Dependent Claim
25 words
The system recited in claim 14, 15, 16 or 17 including means for limiting the duration of said control pulse at certain predetermined engine speeds.
Claim 24
Independent Claim
313 words
A system for controlling a solenoid operated fuel injector in timed relation to the operating cycle of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising: means for generating a trigger pulse for each operating cycle of said engine; means for generating a first signal pulse, in response to each trigger pulse, over a preselected range of engine crankshaft rotational speeds, said first signal pulse having a duration in degrees of crankshaft angle rotation that is fixed; means for generating a second signal pulse, in response to each trigger pulse, over said preselected range of engine crankshaft rotational speeds, said second signal pulse having a duration in degrees of engine crankshaft rotation that varies as a function of the rotational speed of the engine crankshaft; means for generating a speed signal, in response to said trigger pulse, which is a function of the rotational speed of said engine crankshaft; means, responsive to said speed signal, for eliminating the pulses from said second signal pulse generator above a preselected rotational speed of said engine crankshaft; and means for generating an energizing pulse for energizing said fuel injector solenoid, in response to each trigger pulse, to inject fuel into the engine for each operating cycle of the engine, said pulse generating means including: means, responsive to each trigger pulse and said speed signal for comparing the duration of said first signal pulse to the duration of said second signal pulse and generating an energizing pulse, said energizing pulse having a duration equal to the shorter duration of said compared pulses when there are two pulses to be compared and a duration equal to the duration of said first signal pulse when only one signal pulse is received, whereby said fuel injector is actuated when said fuel injector solenoid receives said energizing pulse.
Claim 25
Independent Claim
313 words
A system for controlling a solenoid operated fuel injector in timed relation to the operating cycle of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising: means for generating a trigger pulse for each operating cycle of said engine; means for generating a first signal pulse, in response to each trigger pulse, over a preselected range of engine crankshaft rotational speeds, said first signal pulse having a duration in degrees of crankshaft angle rotation that is fixed; means for generating a second signal pulse, in response to each trigger pulse, over said preselected range of engine crankshaft rotational speeds, said second signal pulse having a duration in degrees of engine crankshaft rotation that varies as a function of the rotational speed of the engine crankshaft; means for generating a speed signal, in response to said trigger pulse, which is a function of the rotational speed of said engine crankshaft; means, responsive to said speed signal, for eliminating the pulses from said second signal pulse generator above a preselected rotational speed of said engine crankshaft; and means for generating an energizing pulse for energizing said fuel injector solenoid, in response to each trigger pulse, to inject fuel into the engine for each operating cycle of the engine, said pulse generating means including: means, responsive to each trigger pulse and said speed signal for comparing the duration of said first signal pulse to the duration of said second signal pulse and generating an energizing pulse, said energizing pulse having a duration equal to the shorter duration of said compared pulses when there are two pulses to be compared and a duration equal to the duration of said first signal pulse when only one signal pulse is received, whereby said fuel injector is actuated when said fuel injector solenoid receives said energizing pulse.
Claim 26
Dependent Claim
116 words
The circuit described in claim 20 wherein said first signal pulse generating means comprises: means for generating a first signal, the magnitude of which increases as the rotational speed of the engine crankshaft increases; and a monostable multivibrator responsive to each trigger pulse for providing a first signal pulse, said monostable multivibrator having means for controlling the duration of said first signal pulse which includes means for receiving said first signal to control the duration of said first signal pulse, whereby said first signal pulse duration is controlled by said first signal to provide a control pulse duration which is a fixed number of degrees of engine crankshaft rotation over a preselected range of engine speeds.
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |