US3716034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature-dependent time-delay switch
Assignee: Robert Bosch GmbH
•
Filing: 1970-09-17
•
Granted: 1973-02-13
•
Expires: 1990-09-17
Abstract
Abstract A Miller integrator is connected to the output of a circuit the output current of which is dependent on the temperature of a temperature-dependent resistor responsive to engine temperature. A switching stage which controls the current through the starting valve of the engine is turned off when the current in the Miller integrator reaches a predetermined value after a time delay that depends on the temperature of the temperature-dependent resistor.
Inventors
- 👤 H Schmid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:48
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/061; F02D41/062; F02D41/064; H; H03; H03K; H03K17/00; H03K17/28; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
135 words
In an auxiliary starting arrangement for a fuel-injection internal combustion engine, in combination an electrically operated fuel-injection valve; actuating means having an electrical input, and being operative for opening said valve and therewith generating an integrate signal and for closing said valve when the input signal at said electrical input reaches a predetermined value; temperature-sensing means for producing a temperature signal indicative of a sensed temperature associated with said engine; and integrating circuit means for applying to said electrical input an input signal which has an initial value and which upon generation of said integrate signal departs from said initial value towards said predetermined value in correspondence to the time integral of said temperature signal and reaches said predetermined value after a time interval the length of which is a function off said temperature signal.
Claim 2
Dependent Claim
135 words
In an auxiliary starting arrangement for a fuel-injection internal combustion engine, in combination an electrically operated fuel-injection valve; actuating means having an electrical input, and being operative for opening said valve and therewith generating an integrate signal and for closing said valve when the input signal at said electrical input reaches a predetermined value; temperature-sensing means for producing a temperature signal indicative of a sensed temperature associated with said engine; and integrating circuit means for applying to said electrical input an input signal which has an initial value and which upon generation of said integrate signal departs from said initial value towards said predetermined value in correspondence to the time integral of said temperature signal and reaches said predetermined value after a time interval the length of which is a function off said temperature signal.
Claim 3
Dependent Claim
135 words
In an auxiliary starting arrangement for a fuel-injection internal combustion engine, in combination an electrically operated fuel-injection valve; actuating means having an electrical input, and being operative for opening said valve and therewith generating an integrate signal and for closing said valve when the input signal at said electrical input reaches a predetermined value; temperature-sensing means for producing a temperature signal indicative of a sensed temperature associated with said engine; and integrating circuit means for applying to said electrical input an input signal which has an initial value and which upon generation of said integrate signal departs from said initial value towards said predetermined value in correspondence to the time integral of said temperature signal and reaches said predetermined value after a time interval the length of which is a function off said temperature signal.
Claim 4
Dependent Claim
135 words
In an auxiliary starting arrangement for a fuel-injection internal combustion engine, in combination an electrically operated fuel-injection valve; actuating means having an electrical input, and being operative for opening said valve and therewith generating an integrate signal and for closing said valve when the input signal at said electrical input reaches a predetermined value; temperature-sensing means for producing a temperature signal indicative of a sensed temperature associated with said engine; and integrating circuit means for applying to said electrical input an input signal which has an initial value and which upon generation of said integrate signal departs from said initial value towards said predetermined value in correspondence to the time integral of said temperature signal and reaches said predetermined value after a time interval the length of which is a function off said temperature signal.
Claim 5
Dependent Claim
33 words
In an arrangement as defined in claim 1, said temperature sensing means including a temperature-dependent resistor, variations in the resistance of said resistor producing corresponding changes in the value of said temperature signal.
Claim 6
Dependent Claim
59 words
In an arrangement as defined in claim 1, said temperature-sensing means including a voltage divider comprising a temperature-dependent resistor and a voltage tap, and further including a first transistor whose base is biased by the tap voltage of said voltage divider, whereby variations in said sensed temperature will produce corresponding variations in the collector current of said first transistor.
Claim 7
Dependent Claim
53 words
In an arrangement as defined in claim 2, said temperature sensing means further including thermal compensation means for preventing changes in the value of said temperature signal other than those resulting from variations in said resistance of said temperature-dependent resistor, whereby said temperature signal will constitute an accurate indication of said sensed temperature.
Claim 8
Dependent Claim
48 words
In an arrangement as defined in claim 3, said temperature sensing means further including thermal compensation means comprising an emitter-follower transistor in circuit with said first transistor, variations in the base-emitter voltage of said emitter-follower transistor substantially compensating corresponding variations in the base-emitter voltage of said first transistor.
Claim 9
Dependent Claim
49 words
In an arrangement as defined in claim 1, wherein said valve has an electrical valve control input; said actuating means including supply means supplying electrical energy, and further including switch means in circuit with said valve control input and supply means, for causing opening and closing of said valve.
Claim 10
Dependent Claim
44 words
In an arrangement as defined in claim 6, said switch means including first and second switches connected in circuit, closing of said first switch causing closing of said second switch and opening of said valve for a time interval dependent on said sensed temperature.
Claim 11
Dependent Claim
33 words
In an arrangement as defined in claim 7, said second switch being an electronic switch provided with said electrical input, and opening when the signal at said electrical input reaches said predetermined value.
Claim 12
Dependent Claim
61 words
In an arrangement as defined in claim 6, said integrating circuit means having an input and said temperature sensing means having an output at which said temperature signal is produced, and said switch means being connected with said output of said temperature sensing means and said input of said integrating circuit means and connecting the same when said valve is opened.
Claim 13
Dependent Claim
31 words
In an arrangement as defined in claim 9, said switch means including a diode switching network connecting said output of said sensing means and said input of said integrating circuit means.
Claim 14
Dependent Claim
17 words
In an arrangement as defined in claim 1, said integrating circuit means comprising a Miller integrator stage.
Claim 15
Dependent Claim
51 words
In an arrangement as defined in claim 11, said temperature sensing means having an output at which is generated said temperature signal, said Miller integrator stage having at its input a diode-resistance network, said diode-resistance network connected with the output of said temperature sensing means and further with said actuating means.
Claim 16
Dependent Claim
57 words
In an arrangement as defined in claim 8, said electronic switch comprising a switching transistor whose collector-emitter path is connected in circuit with said valve control input, and said actuating means further including protection means for protecting said switching transistor against damage due to sudden energy changes resulting upon opening and closing of said electrically operated valve.
Claim 17
Dependent Claim
31 words
In an arrangement as defined in claim 13, said protection means including current shunt means connected in circuit with said switching transistor for shunting excessive currents away from said switching transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |