Patent US3707950A successfully refreshed from Google Patents.
US3707950A
Expired / Lapsed
US
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Electronic control system for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1969-10-16
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Granted: 1973-01-02
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Expires: 1989-10-16
Abstract
Abstract An injector injects fuel in each operating cycle, the quantity varying in dependence upon fuel control signal. A desired speed signal is furnished by circuitry associated with the gas pedal. An actual speed signal is also furnished. High gain direct amplifier means having an input circuit and a feedback circuit are adapted to furnish the fuel control signal as a function of both the desired speed signal and the actual speed signal. Various configurations of input circuits and feedback circuits, as well as amplifier output circuits, are illustrated for shaping the characteristic fuel-speed lines which determine motor operation.
Inventors
- 👤 E Schlimme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:04
CPC Classifications
F; F02; F02D; F02D31/00; F02D31/001; F02D31/007; F02D31/009; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/406; F02D41/407
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
241 words
Control system for internal combustion engine, comprising, in combination, at least one fuel control means furnishing fuel to said engine throughout an operating range comprising minimum and maximum speeds and minimum and maximum fuel supply, in dependence upon a fuel control signal; means for furnishing a desired speed signal corresponding to the desired engine speed; means for furnishing an actual speed signal corresponding to the actual engine speed; and high gain direct current differential amplifier means connected to said means for furnishing a desired speed signal and said means for furnishing an actual speed signal, said high gain direct current differential amplifier means having a first and second amplifier input terminal, an amplifier output terminal, a first and second amplifier input circuit respectively connected to said first and second amplifier input terminal, and a feedback circuit connected between said amplifier output terminal and said first input terminal, said high gain direct current differential amplifier means furnishing said control signal within said operating range in response to the difference between signals applied respectively at said first and second amplifier input terminal, said first amplifier input circuit or said feedback circuit including at least one impedance changing element for changing the impedance thereof in response to signals generated in said high gain direct current differential amplifier means under predetermined operating conditions of said internal combustion engine, whereby said control signal varies also as a function of the impedance of said impedance changing element.
Claim 2
Dependent Claim
241 words
Control system for internal combustion engine, comprising, in combination, at least one fuel control means furnishing fuel to said engine throughout an operating range comprising minimum and maximum speeds and minimum and maximum fuel supply, in dependence upon a fuel control signal; means for furnishing a desired speed signal corresponding to the desired engine speed; means for furnishing an actual speed signal corresponding to the actual engine speed; and high gain direct current differential amplifier means connected to said means for furnishing a desired speed signal and said means for furnishing an actual speed signal, said high gain direct current differential amplifier means having a first and second amplifier input terminal, an amplifier output terminal, a first and second amplifier input circuit respectively connected to said first and second amplifier input terminal, and a feedback circuit connected between said amplifier output terminal and said first input terminal, said high gain direct current differential amplifier means furnishing said control signal within said operating range in response to the difference between signals applied respectively at said first and second amplifier input terminal, said first amplifier input circuit or said feedback circuit including at least one impedance changing element for changing the impedance thereof in response to signals generated in said high gain direct current differential amplifier means under predetermined operating conditions of said internal combustion engine, whereby said control signal varies also as a function of the impedance of said impedance changing element.
Claim 3
Dependent Claim
25 words
A control system as set forth in claim 1, wherein said control system is adapted to maintain a constant engine speed, independent of load changes.
Claim 4
Dependent Claim
40 words
A control system as set forth in claim 1, wherein said control system is adapted to maintain the lowest no-load speed above a predetermined minimum no-load speed, and to limit the top no-load speed to a predetermined maximum no-load speed.
Claim 5
Dependent Claim
42 words
A control system as set forth in claim 2, wherein said speed control system is further adapted to maintain the lowest no-load speed above a predetermined minimum no-load speed, and to limit the top no-load speed to a predetermined maximum no-load speed.
Claim 6
Dependent Claim
18 words
A control system as set forth in claim 2, wherein said feedback circuit comprises only passive electrical component.
Claim 7
Dependent Claim
48 words
A control system as set forth in claim 5, wherein said first amplifier input circuit has a first input terminal; wherein said actual speed signal is applied to said first input terminal; further comprising a first resistor connecting said first input terminal to said first amplifier input terminal.
Claim 8
Dependent Claim
22 words
A control system as set forth in claim 6, wherein a constant input voltage is applied at said second amplifier input terminal.
Claim 9
Dependent Claim
27 words
A control system as set forth in claim 7, wherein said means for furnishing a desired speed signal comprise a passive electrical component having a variable characteristic.
Claim 10
Dependent Claim
55 words
A control system as set forth in claim 8, wherein said passive electrical component comprise in said means for furnishing a desired speed signal is a variable resistance; and wherein said variable resistance is connected in series with a fixed resistance, the series circuit comprising the said resistances being connected to said first input terminal.
Claim 11
Dependent Claim
29 words
A control system as set forth in claim 9, further comprising a D.C. voltage source; and wherein said series circuit has a terminal connected to said D.C. voltage source.
Claim 12
Dependent Claim
32 words
A control system as set forth in claim 10, further comprising a first diode having an anode connected to said series circuit and a cathode connected to said first amplifier input terminal.
Claim 13
Dependent Claim
44 words
A control system as set forth in claim 9, wherein said feedback circuit comprises a single feedback resistance; wherein said D.C. amplifier has amplifier output terminals; and wherein said feedback resistance is connected from said amplifier output terminal to said first amplifier input terminal.
Claim 14
Dependent Claim
51 words
A control system as set forth in claim 12, further comprising first voltage divider means connected from said D.C. voltage source to ground, and having a voltage divider terminal; and second diode means having an cathode connected to said amplifier output terminal and a anode connected to said voltage divider terminal.
Claim 15
Dependent Claim
55 words
A control system as set forth in claim 13, wherein said feedback circuit comprises a feedback resistance having a first terminal connected to said first amplifier input terminal and a second terminal connected to the anode of said second diode; and wherein said fuel control signal is derived from the anode of said second diode.
Claim 16
Dependent Claim
28 words
A control system as set forth in claim 11, further comprising a fifth resistor connected between the cathode of said first diode and said first amplifier input terminal.
Claim 17
Dependent Claim
63 words
A control system as set forth in claim 15, further comprising third voltage divider means connected from the anode of said second diode to said D.C. voltage source, said third voltage divider means having a third voltage divider terminal; and third diode means having an anode connected to said first amplifier input terminal and a cathode connected to said third voltage divider terminal.
Claim 18
Dependent Claim
25 words
A control system as set forth in claim 16, further comprising a fifth resistor connected between said third voltage divider terminal and said input terminal.
Claim 19
Dependent Claim
28 words
A control system as set forth in claim 17, further comprising means for preventing amplifier overdrive connected between said amplifier output terminal and said first amplifier input terminal.
Claim 20
Dependent Claim
26 words
A control system as set forth in claim 18, further comprising a seventh resistor connected between the anode of said second diode and said input terminal.
Claim 21
Dependent Claim
120 words
A contRol system as set forth in claim 3, wherein said high gain direct current differential amplifier means comprise a first and second direct current amplifier respectively having a first and second input circuit and a first and second feedback circuit, said first direct current amplifier having a first and second first amplifier input terminal, said second direct current amplifier having a first and second second amplifier input terminal, said first direct current amplifier having a first amplifier output terminal, said second direct current amplifier having a second amplifier output terminal; wherein said first and second input circuits have a common input terminal; and wherein said actual speed signal comprise an actual speed voltage connected to said common input terminal.
Claim 22
Dependent Claim
29 words
A control system as set forth in claim 20, wherein a constant voltage is applied to the second amplifier input terminal of said first and second direct current amplifiers.
Claim 23
Dependent Claim
65 words
A control system as set forth in claim 21, further comprising a D.C. voltage source; fourth voltage divider means connected across said D.C. voltage source, and having a fourth voltage divider terminal; a fourth diode connected between said fourth voltage divider terminal and said first amplifier output terminal; and a fifth diode connected between said fourth voltage divider terminal and said second amplifier output signal.
Claim 24
Dependent Claim
34 words
A control system as set forth in claim 22, wherein said pure control signal is derived from said fourth voltage divider terminal, said variable resistance constituting said means for furnishing a desired speed signal.
Claim 25
Dependent Claim
54 words
A control system as set forth in claim 22, wherein said fourth voltage divider means comprise a fixed resistance connected from said D.C. voltage source to said fourth voltage divider terminal; and wherein said means for furnishing a desired speed signal comprise a current source connected from said fourth voltage divider terminal to ground.
Claim 26
Dependent Claim
34 words
A control system as set forth in claim 23, further comprising an eighth and ninth resistor respectively connected from said first first amplifier input terminal and said first second amplifier input terminal to ground.
Claim 27
Dependent Claim
34 words
A control system as set forth in claim 24, further comprising an eighth and ninth resistor respectively connected from said first first amplifier input terminal and said first second amplifier input terminal to ground.
Claim 28
Dependent Claim
21 words
A control system as set forth in claim 20, wherein said first and second feedback circuit each comprise a resistance-diode combination.
Claim 29
Dependent Claim
47 words
A control system as set forth in claim 4, wherein said feedback circuit comprises a first feedback circuit and a second feedback circuit, and wherein said first feedback circuit or said second feedback circuit become effective as a function of the speed of said internal combustion engine.
Claim 30
Dependent Claim
39 words
A control system as set forth in claim 28, wherein said first feedback circuit is effective in the no-load region; and wherein said second feedback circuit is effective following the no-load region until the maximum permissible speed is attained.
Claim 31
Dependent Claim
71 words
A control system as set forth in claim 29, wherein said input circuit has an input terminal; wherein said input circuit comprises a tenth and eleventh resistor, each having a first terminal connected to said input terminal, each having a second terminal; and sixth and seventh diodes, respectively having an anode connected to the second terminal of said tenth and eleventh resistors, and a cathode connected to said amplifier input terminal.
Claim 32
Dependent Claim
51 words
A control system as set forth in claim 30, further comprising an eighth diode having a cathode connected to said amplifier output terminal and an anode; and second and third feedback resistances connected from the anode of said eighth diode to the second terminal of said tenth and eleventh resistor, respectively.
Claim 33
Dependent Claim
69 words
A control system as set forth in claim 31, further comprising a twelth resistor connected from said D.C. voltage source to the anode of said Sixth diode; a fifth voltage divider means having a fifth voltage divider terminal connected from said D.C. voltage source to the anode of said eighth diode; and a ninth diode connected from said fifth voltage divider terminal to the anode of said sixth diode.
Claim 34
Dependent Claim
53 words
A control system as set forth in claim 32, wherein said means for furnishing a desired speed signal comprise a variable resistance having a first terminal connected to said D.C. supply source and a second terminal; and fixed resistance means interconnecting said second terminal of said variable resistance and said amplifier output terminal.
Claim 35
Dependent Claim
55 words
A control system as set forth in claim 33, further comprising decoupling means connected to the second terminal of said variable resistance; a tenth diode having a cathode connected to the output of said decoupling means and an anode; and a thirteenth resistor, interconnecting the anode of said tenth diode and said D.C. voltage source.
Claim 36
Dependent Claim
28 words
A control system as set forth in claim 30, further comprising means for effectively decreasing the resistance of said eleventh resistor for speeds exceeding a first predetermined speed.
Claim 37
Dependent Claim
74 words
A control system as set forth in claim 35, wherein said means for effectively decreasing the resistance of said eleventh resistor comprise a fourteenth resistor having a first terminal connected to said input terminal, and a second terminal; and an electronic switching means adapted to connect said second terminal of said fourteenth resistor to the corresponding terminal of said eleventh resistor when the speed of said internal combustion engine exceeds said first predetermined speed.
Claim 38
Dependent Claim
36 words
A control system as set forth in claim 36, wherein said electronic switching means comprise a first transistor having an emitter connected to said fourteenth resistor, a collector connected to said eleventh resistor, and a gate.
Claim 39
Dependent Claim
24 words
A control system as set forth in claim 37, further comprising a gate circuit for furnishing a voltage to the gate of said transistor.
Claim 40
Dependent Claim
60 words
A control system as set fort in claim 38, wherein said gate circuit comprises sixth voltage divider means connected between said D.C. voltage source and ground and having a sixth voltage divider terminal; a fifteenth resistor connected from said D.C. voltage source to the gate of said transistor; and diode means interconnecting said gate and said sixth voltage divider terminal.
Claim 41
Dependent Claim
41 words
A control system as set forth in claim 39, wherein said means for furnishing a desired speed signal comprise means for furnishing a current proportional to said desired speed to the common point of said eleventh resistor and said seventh diode.
Claim 42
Dependent Claim
43 words
A control system as set forth in claim 40, further comprising seventh voltage divider means connected between said D.C. voltage source and ground and having a seventh voltage terminal, said seventh voltage divider terminal being connected to the anode of said eighth diode.
Claim 43
Dependent Claim
22 words
A control system as set forth in claim 41, wherein a constant input voltage is supplied to the second amplifier input terminal.
Claim 44
Dependent Claim
61 words
A control system as set forth in claim 4, wherein said feedback circuit comprises a first feedback circuit and a second feedback circuit; wherein said second feedback circuit becomes effective after the speed of said engine exceeds a changeover speed; and wherein said changeover speed varies in dependence upon the fuel-speed control characteristic along which said combustion engine is being operated.
Claim 45
Dependent Claim
153 words
A control system as set forth in claim 43, wherein said input circuit comprises an input resistor having a first terminal constituting an input terminal and a second terminal connected to said first amplifier input terminal; an eighth diode having a cathode connected to said amplifier output terminal and an anode; wherein said first feedback circuit comprises a resistance connected between the anode of said eighth diode and said first amplifier input terminal; wherein said second feedback circuit comprises a 16th resistor having a first terminal connected to the anode of said eighth diode and a second terminal; electronic switching means for connecting said second terminal of said sixteenth resistor to said first amplifier input terminal when the speed of the engine exceeds said changeover speed; and an additional input resistance having a first terminal connected to said input terminal and a second terminal connected to the second terminal of said 16th resistor.
Claim 46
Dependent Claim
31 words
A control system as set forth in claim 44, further comprising an additional feedback circuit including a Zener diode connected between said amplifier output terminal and first said amplifier input terminal.
Claim 47
Dependent Claim
21 words
A control system as set forth in claim 45, wherein a constant voltage is applied to said second amplifier input terminal.
Claim 48
Dependent Claim
48 words
A control system as set forth in claim 46, further comprising a D.C. voltage source; and output voltage divider means having an output voltage divider terminal connected from said D.C. voltage source to ground, said output voltage divider terminal being connected to the anode of said eighth diode.
Claim 49
Dependent Claim
61 words
A control system as set forth in claim 47, wherein said means for furnishing a desired speed signal comprises means for furnishing a voltage proportional to said desired speed at a speed terminal; eighth voltage divider means connected between said speed terminal and said D.C. voltage source, and having an eighth voltage divider terminal connected to said first amplifier input terminal.
Claim 50
Dependent Claim
42 words
A control system as set forth in claim 48, wherein said electronic switching means comprise a transistor having a base and an emitter-collector circuit, said emitter-collector circuit connecting said 16th resistor to said first amplifier input terminal when said transistor is conductive.
Claim 51
Dependent Claim
95 words
A control system as set forth in claim 49, further comprising ninth voltage divider means connected between said D.C. voltage source and ground, and having a ninth voltage divider terminal; a temperature compensating diode connected between the base of said transistor and said ninth voltage divider terminal; a clamping diode connected between the emitter of said transistor and said ninth voltage divider terminal; a resistor connected between said D.C. voltage source and said base; a resistor connected between said emitter and ground; and a resistor connected between the cathode of said clamping diode and ground.
References Cited (Backward Citations)
CA635428A
Cited
US3045426A
Cited
US2934050A
Cited
US2859738A
Cited
US2886015A
Cited
GB884462A
Cited
US2910054A
Cited
GB884305A
Cited
FR1209652A
Cited
US2982276A
Cited
DE1125718B
Cited
US3051152A
Cited
US2936744A
Cited
US2918911A
Cited
US3000368A
Cited
US3032025A
Cited
DE1126677B
Cited
US3272187A
Cited
US3456628A
Cited
US3407793A
Cited
US3425401A
Cited
US3464396A
Cited
US3575146A
Cited
US3548792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |