US3570460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for blocking fuel injection in an internal combustion engine
Assignee: Robert Bosch GmbH
•
Filing: 1969-09-11
•
Granted: 1971-03-16
•
Expires: 1989-09-11
Abstract
Abstract Opening pulses for fuel injectors are furnished by a multivibrator. The pulses are applied to a resistance-capacitance network which furnishes a negative pulse having an amplitude which varies with the speed and the temperature of the engine. This signal is applied to the base of a switching transistor whose bias is controlled by the accelerator pedal. The collector of the switching transistor is connected to the base of an auxiliary transistor, whose collector is connected by means of a feedback resistance to the base of the switching resistor. The opening pulse is also applied to the base of the auxiliary transistor by means of a series resistance-capacitance circuit. Blocking of the auxiliary transistor causes transmission of the opening pulse to the injector. The auxiliary transistor blocks only upon simultaneous conduction of the multivibrator furnishing the opening pulse and the switching transistor. The circuit is arranged to block the transmission of the opening pulses in case of speeds exceeding the idling speed while the accelerometer pedal is not depressed.
Inventors
- 👤 Friedrich Rabus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:14
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/12; F02D41/123
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
18 words
A control system as set forth in claim 1, wherein said first interconnecting means comprise a first resistance.
Claim 2
Dependent Claim
18 words
A control system as set forth in claim 2, wherein said second interconnecting means comprise a second resistance.
Claim 3
Dependent Claim
29 words
A control system as set forth in claim 3, wherein said means for furnishing opening signals comprise a multivibrator; and wherein said fourth interconnecting means comprise a resistance-capacitance network.
Claim 4
Dependent Claim
81 words
A control system as set forth in claim 4, wherein power to said control system is supplied by means of a first and second supply line; further comprising first voltage divider means connected between said first and second supply line and having a first and second voltage divider tap; wherein said auxiliary control element is connected to said first voltage divider tap; wherein said resistance-capacitance network is a series resistance-capacitance circuit connected from said first to said second voltage divider tap.
Claim 5
Dependent Claim
87 words
A control system as set forth in claim 5 wherein said switching control element is connected to said second supply line by means of a first and second bias resistor connected in series; and wherein said biasing signal furnishing means comprise a switch mechanically intercoupled with said accelerator valve in such a manner that said switch and said accelerator valve close substantially simultaneously, said switch having a first terminal connected to the common point of said bias resistors and a second terminal connected to a predetermined potential.
Claim 6
Dependent Claim
16 words
A control system as set forth in claim 6 wherein said predetermined potential is ground potential.
Claim 7
Dependent Claim
24 words
A control system as set forth in claim 7, further comprising a first diode interconnecting said series bias resistors and said switching control element.
Claim 8
Dependent Claim
23 words
A control system as set forth in claim 8 further comprising a second diode interconnecting said switching control element and said network means.
Claim 9
Dependent Claim
26 words
A control system as set forth in claim 9, wherein said switching circuit means and said auxiliary circuit means comprise a first and second transistor respectively.
Claim 10
Dependent Claim
58 words
A control system as set forth in claim 1 wherein said network means comprise temperature dependent circuit means in thermal contact with said internal combustion engine, and having an electrical characteristic which varies in dependence on the temperature of said internal combustion engine, whereby said operating signal varies bOth as a function of engine speed and engine temperature.
Claim 11
Dependent Claim
93 words
A control system as set forth in claim 11 wherein said output signal is furnished at an output point; wherein the power for said control system is supplied by a first and second supply line; and wherein said temperature dependent circuit means comprise second voltage divider means, said second voltage divider means comprising a negative temperature coefficient resistance in thermal contact with said internal combustion engine, connected in series to a fixed resistance; and means interconnecting said output point and the common point of said negative temperature coefficient resistance and said fixed resistance.
Claim 12
Dependent Claim
51 words
A control system as set forth in claim 1 wherein said network means comprise a first and second passive network; and wherein at least one of said passive networks further comprises a temperature dependent element, thereby causing said operating signal to vary both in dependence upon engine speed and engine temperature.
Claim 13
Dependent Claim
175 words
A control system as set forth in claim 1 wherein said opening signal is an opening pulse; wherein said means for furnishing said opening signal comprise means for furnishing said opening pulses at an opening pulse furnishing terminal; wherein power for said control circuit is supplied by a first and second supply line; and wherein said network means comprise a first charging resistance and a first network capacitance interconnected in series, said series connection having a first terminal connected to said opening pulse furnishing terminal, a common point, and a second terminal connected to said switching control element; a second charging resistance, a second network capacitance, and a third charging resistance series connected between said common point and said first supply line; a diode connected in shunt with said first charging resistance and having its cathode connected to said common point; and an interconnecting resistor connected between the common point of said second network capacitance and said third charging resistance at one terminal, and the output of said switching circuit means at the second terminal.
References Cited (Backward Citations)
US2948272A
Cited
US3032025A
Cited
US3005447A
Cited
US3407793A
Cited
US3463130A
Cited
US3483851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |