US3630177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control for internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1969-10-03
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Granted: 1971-12-28
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Expires: 1989-10-03
Abstract
Abstract The position of a regulator rod controls the amount of fuel during each operating cycle by an injection pump. The position of the rod depends on hydraulic pressure which in turn is controlled by means of an electric valve. The electric valve responds to a control signal which is furnished by a multistage closed loop control circuit in dependence on the difference between a first feedback signal signifying the position of the regulator rod and a desired fuel injection signal varying in dependence both on the motor speed and the position of the accelerator pedal.
Inventors
- 👤 Gerhard Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:22
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/406; F02D41/407; F02D31/00; F02D31/001; F02D31/007; F02D2250/00; F02D2250/38; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
326 words
Arrangement for adjusting the speed of an internal combustion engine within a family of load-speed characteristic curves, at least in part under operator control, comprising, in combination, means for furnishing a regulatable quantity of fuel during each operating cycle of said internal combustion engine; regulator means for regulating said quantity of fuel during each of said operating cycles in response to a control signal; first feedback signal furnishing means, for furnishing a first feedback signal having an amplitude varying as a function of the actual quantity of fuel injected during each operating cycle; second feedback signal furnishing means for furnishing a second feedback signal having an amplitude which varies in dependence upon the actual speed of said internal combustion engine; adjustment means for varying said amplitude of said second feedback signal under operator control, thus furnishing a desired fuel injection signal; first and second power supply lines; and closed loop control circuit means having at least an output stage and an input stage, said input stage comprising a differential amplifier, said differential amplifier comprising a first and second semiconductor element, each of said semiconductor elements having a first and second output electrode and a control electrode, said first feedback signal being applied to said control electrode of said first semiconductor element and said desired fuel injection signal being applied to said control electrode of said second semiconductor element, said differential amplifier means further comprising common resistance means connecting said first output electrodes of said first and second semiconductor elements to said second power supply line and means connecting said second output electrode of said first and second semiconductor elements with said first power supply line, whereby a difference signal varying as a function of the difference in amplitude of signals applied at said first and second control electrode appears at said first output electrodes; and wherein said output stage amplifies said difference signal and furnishes said control signal at a control circuit output in dependence thereon.
Claim 2
Dependent Claim
326 words
Arrangement for adjusting the speed of an internal combustion engine within a family of load-speed characteristic curves, at least in part under operator control, comprising, in combination, means for furnishing a regulatable quantity of fuel during each operating cycle of said internal combustion engine; regulator means for regulating said quantity of fuel during each of said operating cycles in response to a control signal; first feedback signal furnishing means, for furnishing a first feedback signal having an amplitude varying as a function of the actual quantity of fuel injected during each operating cycle; second feedback signal furnishing means for furnishing a second feedback signal having an amplitude which varies in dependence upon the actual speed of said internal combustion engine; adjustment means for varying said amplitude of said second feedback signal under operator control, thus furnishing a desired fuel injection signal; first and second power supply lines; and closed loop control circuit means having at least an output stage and an input stage, said input stage comprising a differential amplifier, said differential amplifier comprising a first and second semiconductor element, each of said semiconductor elements having a first and second output electrode and a control electrode, said first feedback signal being applied to said control electrode of said first semiconductor element and said desired fuel injection signal being applied to said control electrode of said second semiconductor element, said differential amplifier means further comprising common resistance means connecting said first output electrodes of said first and second semiconductor elements to said second power supply line and means connecting said second output electrode of said first and second semiconductor elements with said first power supply line, whereby a difference signal varying as a function of the difference in amplitude of signals applied at said first and second control electrode appears at said first output electrodes; and wherein said output stage amplifies said difference signal and furnishes said control signal at a control circuit output in dependence thereon.
Claim 3
Dependent Claim
260 words
Arrangement for adjusting the speed of an internal combustion engine within a family of load-speed characteristic curves, at least in part under operator control, comprising, in combination, means for furnishing a regulatable quantity of fuel during each operating cycle of said internal combustion engine; regulator means for regulating said quantity of fuel during each of said operating cycles in response to a control signal; first feedback signal furnishing means, for furnishing a first feedback signal having a characteristic varying as a function of the actual quantity of fuel injected during each operating cycle; tachometer means for furnishing a second feedback signal having an electrical characteristic which varies in dependence upon the actual speed of said internal combustion engine; adjustment means for varying said electrical characteristic of said second feedback signal uNder operator control, thus furnishing a desired fuel injection signal; and closed loop control circuit means having at least an input stage and an output stage, said input stage having a first input receiving said first feedback signal, a second input receiving said desired fuel injection signal, and an output furnishing a difference signal varying as a function of the difference between the signals applied at said first and second inputs, said output stage amplifying said difference signal and furnishing said control signal at a control circuit output in dependence thereon; further comprising bistable circuit having an input connected to said tachometer and an output connected to said closed loop control circuit means, for causing a zero fuel injection when the speed of said engine exceeds a predetermined maximum speed.
Claim 4
Dependent Claim
260 words
Arrangement for adjusting the speed of an internal combustion engine within a family of load-speed characteristic curves, at least in part under operator control, comprising, in combination, means for furnishing a regulatable quantity of fuel during each operating cycle of said internal combustion engine; regulator means for regulating said quantity of fuel during each of said operating cycles in response to a control signal; first feedback signal furnishing means, for furnishing a first feedback signal having a characteristic varying as a function of the actual quantity of fuel injected during each operating cycle; tachometer means for furnishing a second feedback signal having an electrical characteristic which varies in dependence upon the actual speed of said internal combustion engine; adjustment means for varying said electrical characteristic of said second feedback signal uNder operator control, thus furnishing a desired fuel injection signal; and closed loop control circuit means having at least an input stage and an output stage, said input stage having a first input receiving said first feedback signal, a second input receiving said desired fuel injection signal, and an output furnishing a difference signal varying as a function of the difference between the signals applied at said first and second inputs, said output stage amplifying said difference signal and furnishing said control signal at a control circuit output in dependence thereon; further comprising bistable circuit having an input connected to said tachometer and an output connected to said closed loop control circuit means, for causing a zero fuel injection when the speed of said engine exceeds a predetermined maximum speed.
Claim 5
Dependent Claim
98 words
A system as set forth in claim 1, wherein said regulator means comprise a regulator member adapted to move along a predetermined path in response to pressure applied at a predetermined location, said regulator member being connected to said fuel furnishing means in such a manner that the quantity of fuel injected during each operating cycle of said combustion engine depends upon the location along said path of said regulator member; means for applying a hydraulic pressure at said predetermined location; and electrically controlled hydraulic valve means for varying said hydraulic pressure in response to said control signal.
Claim 6
Dependent Claim
53 words
A system as set forth in claim 3, wherein said first feedback signal furnishing means comprise electrical feedback means, having a movable arm mechanically intercoupled with said regulator member, and adapted to generate a first electrical feedback signal varying as a function of the location of said regulator member along said predetermined path.
Claim 7
Dependent Claim
14 words
A system as set forth in claim 1 wherein said semiconductor elements are transistors.
Claim 8
Dependent Claim
22 words
A system as set forth in claim 3, wherein said output stage comprises a first output stage; and a power output stage.
Claim 9
Dependent Claim
16 words
A system as set forth in claim 6, wherein said first output stage comprises a PNP-transistor.
Claim 10
Dependent Claim
107 words
A system as set forth in claim 6, wherein said hydraulic valve means comprise an electrical input element; wherein said power output stage comprises an output semiconductor element having an output control electrode and an output circuit; wherein said first output stage comprises a first output semiconductor element having a first output control electrode; first passive circuit means intercoupling the output of said first output stage and said output control electrode; second passive circuit means intercoupling said output circuit and said first output control electrode; and wherein said electrical input element of said hydraulic valve means is connected in said output circuit of said power output stage.
Claim 11
Dependent Claim
16 words
A system as set forth in claim 8, wherein said output semiconductor element is a NPN-transistor.
Claim 12
Dependent Claim
18 words
A system as set forth in claim 2, wherein said bistable circuit comprises a first and second NPN-transistor.
Claim 13
Dependent Claim
126 words
A system as set forth in claim 10, wherein said second feedback signal furnishing means comprise a tachometer, having at least one tachometer winding; wherein one side of said winding is connected to said second power supply line; wherein said safety arrangement further comprises a capacitor having a first capacitor terminal connected to the second terminal of said winding, and a second capacitor terminal; wherein said safety circuit means further comprises a resistor having a first resistor terminal connected to the second capacitor terminal, and a second resistor terminal connected to said first power supply line; and wherein said safety circuit means further comprises rectifier means having an anode connected to the gate of said first NPN-transistor and a cathode connected to said first resistor terminal.
Claim 14
Dependent Claim
48 words
A system as set forth in claim 11, wherein said second NPN-transistor has a seconD collector, a second emitter and a second gate; further comprising second rectifier means having an anode connected to said third input of said amplifier means, and a cathode connected to said second collector.
Claim 15
Dependent Claim
29 words
A system as set forth in claim 2, wherein the varying characteristic of said first feedback signal and said desired fuel injection signal is the amplitude of said signals.
Claim 16
Dependent Claim
43 words
A system as set forth in claim 2, wherein said output stage of said closed loop control circuit means comprises an output transistor have an output control electrode; and wherein the output of said bistable circuit is connected to said output control electrode.
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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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |