US3796204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition arrangement for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1971-12-17
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Granted: 1974-03-12
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Expires: 1991-12-17
Abstract
Abstract An electronic ignition arrangement for internal combustion engines in which an ignition capacitor is connected to a charging circuit and a discharging circuit. A controlled electronic switch in the discharging circuit is connected in series with the primary winding of an ignition transformer which applies ignition pulses to the spark plugs. A signal generator coupled to the crankshaft of the engine operates the controlled electronic switch in the discharge circuit, synchronously with the engine. A charging transformer in the charging circuit has its primary winding interconnected with the primary winding of a control transformer, the secondary winding of which functions as a feedback winding. An auxiliary controlled electronic switch is connected in circuit with the primary winding of the charging transformer, and a limiting switch is connected to the primary winding of the control transformer.
Inventors
- 👤 H Roth
- 👤 H Roozenbeek
- 👤 G Hohne
- 👤 K Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:18
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
406 words
An ignition arrangement for an internal combustion engine, comprising, in combination, at least one spark-producing unit; ignition transformer means comprising secondary winding means connected across said spark-producing unit and also comprising primary winding means; ignition capacitor means; charging transformer means comprising primary winding means and secondary winding means; a source of voltage; rectifier means; means connecting together said ignition capacitor means, said rectifier means and said secondary winding means of said charging transformer means to form a charging path for said ignition capacitor means; discharge switch means; means connecting together said ignition capacitor means, said discharge switch means and said primary winding means of said ignition transformer means to form a discharge path for said ignition capacitor means; electronic switch means having a control input; means connecting said electronic switch means in series with said primary winding means of said charging transformer means and connecting said electronic switch means and said primary winding means of said charging transformer means to said voltage source for energization of said primary winding means of said charging transformer means when said electronic switch means is conductive; means synchronized with said engine and operative for rendering said discharge switch means conductive to effect discharging of said ignition capacitor means through said primary winding means of said ignition transformer means and for also rendering said electronic switch means conductive to initiate the flow of current through said primary winding means of said charging transformer means; feedback winding means connected to said control input of said electronic switch means and responsive to changes in flux produced by current flowing through said primary winding means of said charging transformer means and operative for applying to said control input at least part of a voltage generated across said feedback winding means in response to said changes in flux for maintaining said electronic switch means conductive after the latter has been rendered conductive; and cut-off means including cut-off switch means connected to said feedback winding means and automatically operative after build-up of current flow through said primary winding means of said charging transformer means for preventing continued generation across said feedback winding means of a voltage large enough to maintain said electronic switch means conductive, whereby to terminate the flow of current through said primary winding means of said charging transformer means and thereby generate across the secondary winding means of said charging transformer means a charging voltage resulting in charging of said ignition capacitor means.
Claim 2
Dependent Claim
406 words
An ignition arrangement for an internal combustion engine, comprising, in combination, at least one spark-producing unit; ignition transformer means comprising secondary winding means connected across said spark-producing unit and also comprising primary winding means; ignition capacitor means; charging transformer means comprising primary winding means and secondary winding means; a source of voltage; rectifier means; means connecting together said ignition capacitor means, said rectifier means and said secondary winding means of said charging transformer means to form a charging path for said ignition capacitor means; discharge switch means; means connecting together said ignition capacitor means, said discharge switch means and said primary winding means of said ignition transformer means to form a discharge path for said ignition capacitor means; electronic switch means having a control input; means connecting said electronic switch means in series with said primary winding means of said charging transformer means and connecting said electronic switch means and said primary winding means of said charging transformer means to said voltage source for energization of said primary winding means of said charging transformer means when said electronic switch means is conductive; means synchronized with said engine and operative for rendering said discharge switch means conductive to effect discharging of said ignition capacitor means through said primary winding means of said ignition transformer means and for also rendering said electronic switch means conductive to initiate the flow of current through said primary winding means of said charging transformer means; feedback winding means connected to said control input of said electronic switch means and responsive to changes in flux produced by current flowing through said primary winding means of said charging transformer means and operative for applying to said control input at least part of a voltage generated across said feedback winding means in response to said changes in flux for maintaining said electronic switch means conductive after the latter has been rendered conductive; and cut-off means including cut-off switch means connected to said feedback winding means and automatically operative after build-up of current flow through said primary winding means of said charging transformer means for preventing continued generation across said feedback winding means of a voltage large enough to maintain said electronic switch means conductive, whereby to terminate the flow of current through said primary winding means of said charging transformer means and thereby generate across the secondary winding means of said charging transformer means a charging voltage resulting in charging of said ignition capacitor means.
Claim 3
Dependent Claim
67 words
An arrangement as defined in claim 1; and further including additional winding means connected in series with said primary winding means of said charging transformer means and forming together with said feedback winding means a control transformer means, said additional winding means constituting the primary winding means of said control transformer means and said feedback winding means constituting the secondary winding means of said control transformer means.
Claim 4
Dependent Claim
60 words
An arrangement as defined in claim 1, wherein said cut-off switch means is so connected to said feedback winding means that when cOnductive said cut-off switch means reduces the voltage applied by said feedback winding means to said control input of said electronic switch means to a voltage level lower than the requisite for maintaining said electronic switch means conductive.
Claim 5
Dependent Claim
98 words
An arrangement as defined in claim 1, wherein said cut-off switch means comprises an electronic switch element having a control input connected to said feedback winding means in such a manner that at least a portion of the voltage generated across said feedback winding means is applied to said control input of said electronic switch element for rendering said electronic switch element conductive when the voltage across said feedback winding means reaches a predetermined level, and wherein said electronic switch element is connected in parallel with said feedback winding means so as to short-circuit the latter when conductive.
Claim 6
Dependent Claim
126 words
An arrangement as defined in claim 1, wherein said electronic switch means comprises an electronic switch element having a reference electrode, a control electrode and an output electrode, and wherein said feedback winding means comprises a feedback winding, and further comprising a biasing resistor connected between said reference electrode and said control electrode, one terminal of said feedback winding being connected to said reference electrode, and wherein said feedback winding means includes a diode having one electrode connected to the other terminal of said feedback winding and having another electrode connected to said control electrode, said diode being so connected as to be conductive when said electronic switch element is conductive and carry at least a portion of the input current of said electronic switch element.
Claim 7
Dependent Claim
18 words
An arrangement as defined in claim 5, and further comprising a resistor connected in parallel with said diode.
Claim 8
Dependent Claim
126 words
An arrangement as defined in claim 1, wherein said electronic switch means comprises an electronic switch element having a control electrode, a reference electrode and an output electrode, and wherein said cut-off switch means comprises a switch element having a control electrode, a reference electrode and an output electrode, and wherein said feedback winding means comprises a feedback winding having one terminal connected to said reference electrode of said electronic switch means and having another terminal connected to said control electrode of said electronic switch means, and wherein said one terminal of said feedback winding is connected to said reference electrode of said cut-off switch means, and wherein said other terminal of said feedback winding is connected to said output electrode of said cut-off switch means.
Claim 9
Dependent Claim
26 words
An arrangement as defined in claim 7, and further comprising a resistor connected between the control electrode and the reference electrode of said cut-off switch means.
Claim 10
Dependent Claim
47 words
An arrangement as defined in claim 8, and further comprising a resistor connected between the control electrode and output electrode of said cut-off switch means, whereby the voltage across said feedback winding determines the voltage between the reference electrode and control electrode of said cut-off switch means.
Claim 11
Dependent Claim
87 words
An arrangement as defined in claim 8, and further comprising an additional winding connected in series with said primary winding means of said charging transformer means and forming together with said feedback winding a control transformer, said additional winding and said feedback winding respectively constituting the primary winding and secondary winding of said control transformer, wherein the resistor connected between the control electrode and reference electrode of said cut-off switch means is connected across said primary winding of said control transformer to form therewith a series circuit.
Claim 12
Dependent Claim
15 words
An arrangement as defined in claim 8, wherein said resistor is a negative-temperature coefficient resistor.
Claim 13
Dependent Claim
46 words
An arrangement as defined in claim 7, and further comprising a pair of series-connected resistors connected between The control electrode and reference electrode of said cut-off switch means and a pair of negative-temperature-coefficient resistors each connected in parallel with a respective one of said series-connected resistors.
Claim 14
Dependent Claim
25 words
An arrangement as defined in claim 8, and further comprising a capacitor connected between the control electrode and reference electrode of said cut-off switch means.
Claim 15
Dependent Claim
61 words
An arrangement as defined in claim 8, and further comprising a diode connected between the control electrode and reference electrode of said cut-off switch means and being so connected as to be reverse-biased when the voltage between the control electrode and reference electrode of said cut-off switch means has such a polarity such as to render said cut-off switch means conductive.
Claim 16
Dependent Claim
33 words
An arrangement as defined in claim 1, and further comprising auxiliary winding means also responsive to the flux produced by the current flowing through said primary winding means of said charging transformer means.
Claim 17
Dependent Claim
48 words
An arrangement as defined in claim 2, and further comprising auxiliary winding means responsive to the flux produced by current flowing through said primary winding means of said charging transformer means and constituting together with said feedback winding means said secondary winding means of said control transformer means.
Claim 18
Dependent Claim
85 words
An arrangement as defined in claim 15, wherein said electronic switch means and said cut-off switch means each comprises an electronic switch element having a control electrode, a reference electrode and an output electrode, and wherein said feedback winding means is connected between the control electrode and reference electrode of said electronic switch means for controlling the conductivity of the same, and wherein said auxiliary winding means is connected to said control electrode of said cut-off switch means for controlling the conductivity of the latter.
Claim 19
Dependent Claim
43 words
An arrangement as defined in claim 17, wherein said auxiliary winding means is connected between said output electrode of said cut-off switch means and the terminal of said feedback winding means to which said control input of said electronic switch means is connected.
Claim 20
Dependent Claim
233 words
An arrangement as defined in claim 1, wherein said secondary winding means of said charging transformer means comprises a secondary winding having two terminals, and further comprising a capacitor having one terminal connected to one terminal of said secondary winding, means connecting the other terminal of said capacitor to the other terminal of said secondary winding and including a first diode connected between said other terminals and having a forward-bias direction such that when the voltage generated across said secondary winding has a polarity not resulting in charging of said ignition capacitor means a charging current flows from said secondary winding through said capacitor to charge said capacitor, said cut-off switch means comprising an electronic switch element having a control electrode, a reference electrode and an output electrode, said reference electrode being connected to said other terminal of said capacitor, and further comprising means connecting said control electrode to said one terminal of said secondary winding and including a Zener diode, and means connecting said control electrode to said other terminal of said secondary winding and including a second diode connected to become reverse-biased when the voltage generated across said secondary winding has a polarity opposite to that resulting in charging of said ignition capacitor means, with said output electrode of said cut-off switch means being so connected as to render said electronic switch means non-conductive when said cut-off switch means becomes conductive.
Claim 21
Dependent Claim
36 words
An arrangement as defined in claim 19, wherein said means connecting said other terminal of said capacitor to said other terminal of said secondary winding further includes a resistor connected in series with said first diode.
Claim 22
Dependent Claim
33 words
An arrangement as defined in claim 19, wHerein said means connecting said control electrode to said other terminal of said secondary winding further includes a resistor connected in series with said second diode.
Claim 23
Dependent Claim
34 words
An arrangement as defined in claim 19, wherein said means connecting said control electrode to said one terminal of said secondary winding further includes a series resistor connected in series with said Zener diode.
Claim 24
Dependent Claim
42 words
An arrangement as defined in claim 22, wherein said means connecting said control electrode to said one terminal of said secondary winding further includes a shunt resistor connected in parallel with the series combination of said Zener diode and said series resistor.
Claim 25
Dependent Claim
115 words
An arrangement as defined in claim 19, wherein said second diode and said Zener diode are connected together to carry Zener-diode current when the voltage generated across said secondary winding has a polarity opposite to that resulting in charging of said ignition capacitor means, and wherein said means connecting said control electrode to said one terminal of said secondary winding and also said means connecting said control electrode to said other terminal of said winding both include a coupling diode having one electrode connected to said control electrode and another electrode connected to one electrode of said Zener diode for applying to said control electrode a voltage dependent upon the magnitude of said Zener-diode current.
Claim 26
Dependent Claim
49 words
An arrangement as defined in claim 24, wherein said means connecting said control electrode to said one terminal of said secondary winding and also said means connecting said control electrode to said other terminal of said secondary winding further include a resistor connected in series with said coupling diode.
Claim 27
Dependent Claim
58 words
An arrangement as defined in claim 19, and further including an auxiliary winding connected between said output electrode of said cut-off switch means and said one terminal of said secondary winding and operative when said cut-off switch means becomes conductive for inducing in said feedback winding means a voltage such as to render said electronic switch means non-conductive.
Claim 28
Dependent Claim
49 words
An arrangement as defined in claim 19, wherein said electronic switch means comprises an electronic switch element having a control electrode, a reference electrode and an output electrode, and wherein said output electrode of said cut-off switch means is connected to said reference electrode of said electronic switch means.
Claim 29
Dependent Claim
49 words
An arrangement as defined in claim 19, wherein said electronic switch means comprises an electronic switch element having a control electrode, a reference electrode and an output electrode, and wherein said output electrode of said cut-off switch means is connected to said control electrode of said electronic switch means.
Claim 30
Dependent Claim
132 words
An arrangement as defined in claim 19, wherein said cut-off means includes a further cut-off switch means in addition to the first-mentioned cut-off switch means, said further cut-off switch means comprising a further electronic switch element having a control electrode, a reference electrode and an output electrode, said further electronic switch element being so connected to said feedback winding means as to prevent when conductive said feedback winding means from applying to the control input of said electronic switch means a control voltage sufficient to maintain the latter conductive, and further comprising a diode shunting said capacitor and connected with such polarity as to be reverse-biased when said capacitor is charged, and further including means connecting said one terminal of said capacitor to said control electrode of said further electronic switch element.
Claim 31
Dependent Claim
192 words
An arrangement as defined in claim 5, and further including an additional winding connected in series with said primary winding means of said charging transformer means, said additional winding and said feedback winding together forming a control transformer with said additional winding constituting the primary winding and said feedback wInding constituting the secondary winding of said control transformer, and wherein said cut-off switch means comprises an electronic switch element having a control electrode, a reference electrode and an output electrode, said additional winding having one terminal connected to said reference electrode of said electronic switch means and another terminal connected to said reference electrode of said cut-off switch means, a capacitor connecting said output electrode of said cut-off switch means to said other terminal of said feedback winding, a diode connected between said outupt electrode of said cut-off switch means and said reference electrode of said electronic switch means with such a polarity as to be reverse-biased when said electronic switch means is conductive, a voltage divider connected across said additional winding and having a voltage divider tap, and means connecting said tap to said control electrode of said cut-off switch means.
Claim 32
Dependent Claim
40 words
An arrangement as defined in claim 30, wherein said means connecting said tap to said control electrode of said cut-off switch means comprises a diode having such a polarity as to be forward-biased when said electronic switch means is conductive.
Claim 33
Dependent Claim
95 words
An arrangement as defined in claim 1, wherein said cut-off switch means comprises a thyristor having an anode, a cathode and a gate, said anode and cathode being so connected to said feedback winding means as to prevent the same from applying to said control input of said electronic switch means a voltage sufficient to maintain the latter conductive when said thyristor is conductive, and means connected to said cathode and gate of said thyristor for rendering said thyristor conductive after build-up of current flow through said primary winding means of said charging transformer means.
Claim 34
Dependent Claim
48 words
An arrangement as defined in claim 1, wherein said electronic switch means comprises an npn-transistor having an emitter-collector path connected in series with said primary winding means of said charging transformer means, with the base and emitter of said transistor constituting said input of said electronic switch means.
References Cited (Backward Citations)
US3238416A
Cited
US3335320A
Cited
US3415234A
Cited
US3418988A
Cited
US3502955A
Cited
US3487822A
Cited
US3546528A
Cited
US3575153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |