US3665900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic control system for shaping the fuel-speed characteristics of an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1969-10-30
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Granted: 1972-05-30
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Expires: 1989-10-30
Abstract
Abstract Additional amplifiers are connected in parallel to the high gain direct current amplifier of the parent application. These have a very high output impedance compared to the output impedance of the direct current amplifier. All amplifier outputs are connected to a voltage divider tap from which the fuel control signal is derived. The additional amplifiers have inherent temperature compensation and shape the full-load limiting line, while the original high gain direct current amplifier shapes the speed control lines.
Inventors
- 👤 Ewald Schlimme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:25
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
221 words
Electronic control system for internal combustion engines, comprising, in combination, at least one electrically controlled fuel injector means for injecting a quantity of fuel corresponding to a fuel control signal during each operating cycle; a source of D.C. voltage; voltage divider means having a voltage divider tap, connected in parallel with said source of voltage; means for furnishing a desired speed signal signifying the desired engine speed; means for furnishing an actual speed signal signifying the actual engine speed; direct current feedback amplifier means connected to said means for furnishing a desired speed signal and said means for furnishing an actual speed signal, having a feedback amplifier output connected to said voltage divider tap and having a low dynamic output impedance; variable impedance means interconnected with said direct current feedback amplifier means for disconnecting said feedback amplifier output from said voltage divider tap under predetermined operating conditions; feedback means connected to said direct current feedback amplifier means for maintaining a predetermined voltage at said feedback amplifier output under said predetermined operating conditions; and additional amplifier means responsive to said actual speed signal, having aN additional amplifier output connected to said voltage divider tap, and having a high dynamic output impedance relative to said low dynamic output impedance of said direct current feedback amplifier means over the whole actual speed signal range.
Claim 2
Dependent Claim
221 words
Electronic control system for internal combustion engines, comprising, in combination, at least one electrically controlled fuel injector means for injecting a quantity of fuel corresponding to a fuel control signal during each operating cycle; a source of D.C. voltage; voltage divider means having a voltage divider tap, connected in parallel with said source of voltage; means for furnishing a desired speed signal signifying the desired engine speed; means for furnishing an actual speed signal signifying the actual engine speed; direct current feedback amplifier means connected to said means for furnishing a desired speed signal and said means for furnishing an actual speed signal, having a feedback amplifier output connected to said voltage divider tap and having a low dynamic output impedance; variable impedance means interconnected with said direct current feedback amplifier means for disconnecting said feedback amplifier output from said voltage divider tap under predetermined operating conditions; feedback means connected to said direct current feedback amplifier means for maintaining a predetermined voltage at said feedback amplifier output under said predetermined operating conditions; and additional amplifier means responsive to said actual speed signal, having aN additional amplifier output connected to said voltage divider tap, and having a high dynamic output impedance relative to said low dynamic output impedance of said direct current feedback amplifier means over the whole actual speed signal range.
Claim 3
Dependent Claim
35 words
A control system as set forth in claim 1, further comprising a source of current connected in parallel to the parallel combination of said high gain direct current amplifier means and said additional amplifier means.
Claim 4
Dependent Claim
29 words
A control system as set forth in claim 2, wherein the current furnished by said source of current varies as a function of an operating parameter of said engine.
Claim 5
Dependent Claim
74 words
A control system as set forth in claim 1, wherein said additional amplifier means comprise an amplifying circuit adapted to furnish an additional output signal varying as a function of engine speed, in response to said actual speed signal, when said actual speed signal signifies an engine speed less than a first predetermined speed, and a constant additional output signal when said actual speed signal signifies an engine speed exceeding said first predetermined speed.
Claim 6
Dependent Claim
121 words
A control system as set forth in claim 4, wherein said amplifying circuit comprises a DC voltage source; a transistor having an emitter, collector and base; wherein said voltage divider means are connected across said DC voltage source; wherein the collector of said transistor is connected to said voltage divider tap; wherein said actual speed signal is supplied to the emitter of said transistor; further comprising additional voltage divider means connected in parallel to said voltage divider means and having an additional voltage divider tap; diode means having an anode connected to the base of said transistor and a cathode connected to said additional voltage divider tap; and resistance means interconnecting the collector of said transistor and said DC voltage source.
Claim 7
Dependent Claim
41 words
A control system as set forth in claim 5, further comprising means for furnishing a constant speed signal corresponding to a second predetermined engine speed to the emitter of said transistor until said engine speed exceeds said second predetermined engine speed.
Claim 8
Dependent Claim
92 words
A control system as set forth in claim 6, wherein said means for supplying a constant speed signal corresponding to a second predetermined engine speed comprises further voltage divider means connected across said DC voltage source and having a further voltage divider tap; additional diode means interconnecting said additional voltage divider tap and said means for furnishing an actual speed signal; and an emitter-resistor having a first terminal connected to the emitter of said transistor and a second terminal constituting an additional amplifier input terminal connected to said further voltage divider tap.
Claim 9
Dependent Claim
21 words
A control system as set forth in claim 7, wherein said further voltage divider means comprise a first and second resistor.
Claim 10
Dependent Claim
59 words
A control system as set forth in claim 7, wherein said further voltage divider means comprise a voltage divider transistor having an emitter-collector circuit connected from said DC voltage source to said additional amplifier input terminal; further comprising base circuit voltage divider means having a base circuit voltage divider tap connected to the base of said voltage divider transistor.
Claim 11
Dependent Claim
30 words
A control system as set forth in claim 7, wherein said further voltage divider means comprise further diode means; and resistance means connected in series with said further diode means.
Claim 12
Dependent Claim
78 words
A control system as set forth in claim 1, wherein said additional amplifier means comprise a second amplifier circuit adapted to furnish a second additional output signal varying as a function of engine speed, in response to said actual speed signal, when said actual speed signal signifies an engine speed exceeding a third predetermined speed, and adapted to furnish a second constant output signal when said actual speed signal signifies a speed less than said third predetermined speed.
Claim 13
Dependent Claim
39 words
A control system as set forth in claim 11, wherein said second amplifier circuit furnishes an additional output signal decreasing with increasing engine speed when said actual speed signal signifies an engine speed greater than said third predetermined speed.
Claim 14
Dependent Claim
29 words
A control system as set forth in claim 12, further comprising means for maintaining said second additional output signal constant when said engine speed exceeds a fourth determined speed.
Claim 15
Dependent Claim
93 words
A control system as set forth in claim 12, wherein said second amplifier circuit comprises a second transistor having a second emitter, a second collector, and a second base, said collector being directly connected to said voltage divider tap; temperature compensating diode means interconnecting said means for furnishing an actual speed signal and the base of said transistor; a first resistor connecting said emitter to ground; a DC voltage source; a second resistor connecting said emitter to said DC voltage source; and a third resistor connecting said base to said DC voltage source.
Claim 16
Dependent Claim
19 words
A control system as set forth in claim 14, further comprising a fourth resistor connecting said base to ground.
Claim 17
Dependent Claim
62 words
A control system as set forth in claim 14, further comprising a third transistor having a third base, a third emitter, and a third collector, said third emitter being connected to said second base, said third collector being connected to ground; fifth resistor connecting said third base to ground; and a sixth resistor connecting said third base to said DC voltage source.
Claim 18
Dependent Claim
38 words
A control system as set forth in claim 15, further comprising second temperature compensating diode means, said second temperature compensating diode means having an anode connected to said second base and a cathode connected to said fourth resistor.
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |