US3703889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition arrangement for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1970-10-22
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Granted: 1972-11-28
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Expires: 1990-10-22
Abstract
Abstract Four rotating magnets, driven by the engine, induce in two or more windings a charging pulse, a discharging pulse, and a control pulse, the latter pulse in certain embodiments being identical with the charging pulse. The control pulse, the value of which is engine rpm-dependent, causes a normally open circuit shunting the ignition capacitor to close when the engine rpm exceeds the permissible maximum, thereby discharging the ignition capacitor and preventing it from furnishing electrical energy to the spark coil. In this way, the engine rpm is limited to safe values.
Inventors
- 👤 Bernd Bodig
- 👤 Gerhard Sohner
- 👤 Gert Strelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:11
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/086; F02P15/00; F02P15/12; F02P9/00; F02P9/002; F02P9/005
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
114 words
In an internal combustion engine, a speed-limiting ignition arrangement comprising at least one spark plug; an ignition capacitor; first means for generating charging signals and ignition signals timed in synchronism with the rotation of said engine, and including means for generating a control signal preceding the respective signal when the speed of said engine exceeds a predetermined value; discharge means for effecting firing of said spark plug upon receipt of an ignition signal by permitting transmission to said spark plug of energy stored in said capacitor, and including additional means operative upon receipt of said control signal for preventing said capacitor from being in charged condition during generation of the respective subsequent ignition signal.
Claim 2
Dependent Claim
114 words
In an internal combustion engine, a speed-limiting ignition arrangement comprising at least one spark plug; an ignition capacitor; first means for generating charging signals and ignition signals timed in synchronism with the rotation of said engine, and including means for generating a control signal preceding the respective signal when the speed of said engine exceeds a predetermined value; discharge means for effecting firing of said spark plug upon receipt of an ignition signal by permitting transmission to said spark plug of energy stored in said capacitor, and including additional means operative upon receipt of said control signal for preventing said capacitor from being in charged condition during generation of the respective subsequent ignition signal.
Claim 3
Dependent Claim
36 words
An arrangement as defined in claim 1, wherein said discharge means comprises electronic switch means for alternatively permitting and preventing flow of discharge current from said capacitor as a function of said ignition and control signals.
Claim 4
Dependent Claim
18 words
An arrangement as defined in claim 2, wherein said first means comprises movable magnet means and winding means.
Claim 5
Dependent Claim
51 words
An ignition arrangement as defined in claim 3, including stationary magnetic core means for said winding means, and wherein said movable magnet means includes four permanent magnets of which three have the same pole facing said magnetic core means and the fourth has the other pole facing said magnetic core means.
Claim 6
Dependent Claim
135 words
An ignition arrangement as defined in claim 4, wherein said winding means includes a charge winding connected with and supplying charging current to said ignition capacitor, and an ignition signal winding, said magnet means inducing a voltage across said charge winding and an ignition signal across said ignition signal winding, said core means including two magnetic cores, one for said charge winding and another for said ignition signal winding, each of said cores having two ends, said four magnets defining the perimeter of a circle and being equidistantly spaced along said perimeter, said four magnets further being so positioned relative to said two cores that said two ends of a core face the respective spaces between consecutive ones of said four magnets for a particular relative position between said four magnets and said two cores.
Claim 7
Dependent Claim
65 words
An ignition arrangement as defined in claim 5, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and one end of said ignition signal winding is connected to the cathode of said thyristor, and further including a diode connected between the other end of said ignition signal winding and the control electrode of said thyristor to conduct only positive signals.
Claim 8
Dependent Claim
50 words
An ignition arrangement as defined in claim 5, wherein said winding means further includes a control signal winding in which said control signal is induced by Said magnet means, said control signal winding being wound on that one of said two magnetic cores on which said charge winding is wound.
Claim 9
Dependent Claim
24 words
An ignition arrangement as defined in claim 7, wherein said first means generates said control signal subsequent to commencing charging of said ignition capacitor.
Claim 10
Dependent Claim
52 words
An ignition arrangement as defined in claim 3, wherein said winding means includes a control signal winding in which said control signal is induced by said magnet means, and further including a stationary control signal magnetic core for said control signal winding, and core means for the rest of said winding means.
Claim 11
Dependent Claim
49 words
An ignition arrangement as defined in claim 9, wherein said movable magnet means rotates about an axis, and said core means further includes a stationary charge magnetic core for said charge winding, said control signal and charge pulse magnetic cores being aligned in the direction defined by said axis.
Claim 12
Dependent Claim
27 words
An ignition arrangement as defined in claim 10, wherein said first produces said control signal at the same time that it begins to charge said ignition capacitor.
Claim 13
Dependent Claim
70 words
An arrangement as defined in claim 1, wherein said first means is operative for supplying charging current to said capacitor during a predetermined part of an ignition cycle, and is operative for producing said control signal during the same part of a control cycle, whereby if said control signal has said discharge circuit value said discharge circuit additional means will prevent charging of said ignition capacitor by said first means.
Claim 14
Dependent Claim
42 words
An arrangement as defined in claim 1, wherein said discharge means comprises one discharge path including an electronic switch responsive to said ignition signal, and wherein said additional means includes another discharge path including an electronic switch responsive to said control signal.
Claim 15
Dependent Claim
32 words
An arrangement as defined in claim 1, wherein said discharge means and additional means together comprise a single discharge path including electronic switch means responsive to both said ignition and control signals.
Claim 16
Dependent Claim
57 words
An ignition arrangement as defined in claim 3, wherein said electronic switch means includes a thyristor rendered conductive by said control signal and said winding means includes a spark coil having a primary connected in series with the anode-cathode path of said thyristor, said series-connected primary and anode-cathode path being connected in parallel with said ignition capacitor.
Claim 17
Dependent Claim
43 words
An ignition arrangement as defined in claim 3, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and a resistor means in series with said thyristor, said thyristor and resistor being connected in parallel with said ignition capacitor.
Claim 18
Dependent Claim
25 words
An ignition arrangement as defined in claim 3, wherein said winding means includes a common winding in which said control and ignition signals are induced.
Claim 19
Dependent Claim
31 words
An ignition arrangement as defined in claim 17, wherein said winding means includes a spark coil for said spark plug said spark coil having a primary which is said common winding.
Claim 20
Dependent Claim
16 words
An ignition arrangement as defined in claim 6, including a resistor in series with said diode.
Claim 21
Dependent Claim
29 words
An ignition arrangement as defined in claim 6, wherein of said three permanent magnets the middle one has a weaker field than the others of said four permanent magnets.
Claim 22
Dependent Claim
39 words
An ignition arrangement as defined in claim 3, including a series-connected capacitor and resistor connected to said winding means so that at least part of said control signal appears at least across one of said series-connected capacitor and resistor.
Claim 23
Dependent Claim
19 words
An ignition arrangement as defined in claim 21, wherein said resistor at least in part is an adjustable resistor.
Claim 24
Dependent Claim
24 words
An ignition arrangement as defined in claim 22, wherein said resistor consists also of a fixed resistor connected in series with said adjustable resistor.
Claim 25
Dependent Claim
59 words
An ignition arrangement as defined in claim 21, including normally non-coNductive voltage-operated switch means connected to the junction between said series-connected capacitor and resistor and to said electronic switch means for rendering the latter conductive when the engine speed exceeds a predetermined value, said voltage-operated switch means becoming conductive when the voltage at the junction exceeds a predetermined value.
Claim 26
Dependent Claim
72 words
An ignition arrangement as defined in claim 24, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and said winding means includes a spark coil having a primary connnected in series with the anode-cathode path of said thyristor, said series-connected primary and anode-cathode path being connected in parallel with said ignition capacitor, and wherein said voltage-operated switch means is connnected to the control electrode of said thyristor.
Claim 27
Dependent Claim
58 words
An ignition arrangement as defined in claim 24, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and resistor means in series with said thyristor, said thyristor and resistor means being connected in parallel across said ignition capacitor, and wherein said voltage-operated switch means is connected to the control electrode of said thyristor.
Claim 28
Dependent Claim
42 words
An ignition arrangement as defined in claim 25, wherein said series-connected capacitor and resistor are connected in parallel with said ignition capacitor, the capacitor end and the resistor end being respectively connected to the positive and negative plates of said ignition capacitor.
Claim 29
Dependent Claim
42 words
An ignition arrangement as defined in claim 26, wherein said series-connected capacitor and resistor are connected in parallel with said ignition capacitor, the capacitor end and the resistor end being respectively connected to the positive and negative plates of said ignition capacitor.
Claim 30
Dependent Claim
140 words
An ignition arrangement as defined in claim 8, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and resistor means in series with said thyristor, said thyristor and resistor means being connected in parallel with said ignition capacitor, and further including a series-connected capacitor end resistor of which the capacitor end and the resistor end are connected to respective ends of said control signal winding; normally non-conductive voltage-operated switch means connected to the junction between said series-connected capacitor and resistor and to the control electrode of said thyristor for rendering the latter conductive when the engine speed exceeds a predetermined value, said voltage-operated switch means becoming conductive when the voltage at said junction exceeds a predetermined value, and the cathode of said thyristor being connected to said resistor end of said series-connected capacitor and resistor.
Claim 31
Dependent Claim
109 words
An ignition arrangement as defined in claim 8, including a series-connected capacitor and resistor; a diode connecting the junction between said series-connected capacitor and resistor to one end of said control signal winding to conduct only positive signals, the other end of the control signal winding being connected to the capacitor end of said series-connected capacitor and resistor; and normally non-conductive voltage-operated switch means connected between the resistor end of said connected capacitor and resistor and said electronic switch means for rendering the latter conductive when the engine speed exceeds a predetermined value, said voltage-operated switch means becoming conductive when the voltage across said capacitor exceeds a predetermined value.
Claim 32
Dependent Claim
98 words
An ignition arrangement as defined in claim 30, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and said winding means includes a spark coil having a primary connected in series with the anode-cathode path of said thyristor, said series-connected primary and anode-cathode path being connected in parallel with said ignition capacitor, and wherein the capaCitor end of said series-connected capacitor and resistor is connected to the cathode of said thyristor, and said voltage-operated switch means connects the resistor end of said series-connected capacitor and resistor to the control electrode of said thyristor.
Claim 33
Dependent Claim
84 words
An ignition arrangement as defined in claim 30, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and resistor means in series with said thyristor, said thyristor and resistor means being connected in parallel with said ignition capacitor, and wherein the capacitor end of said series-connected capacitor and resistor is connected to the cathode of said thyristor, and said voltage-operated switch means connects the resistor end of said series-connected capacitor and resistor to the control electrode of said thyristor.
Claim 34
Dependent Claim
18 words
An ignition arrangement as defined in claim 11, including load resistor means connected across said control signal winding.
Claim 35
Dependent Claim
59 words
An ignition arrangement as defined in claim 33, including normally non-conductive voltage-operated switch means connected between one terminal of said load resistor means and said electronic switch means for rendering the latter conductive when the engine speed exceeds a predetermined value, said voltage-operated switch means becoming conductive when the voltage across said load resistor means exceeds a predetermined value.
Claim 36
Dependent Claim
88 words
An ignition arrangement as defined in claim 29, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and said winding means includes a spark coil having a primary connected in series with the anode-cathode path of said thyristor, said series-connected primary and anode-cathode path being connected in parallel with said ignition capacitor, and wherein said voltage-operated switch means is connected to the control electrode of said thyristor, and the cathode of said thyristor is connected to the other terminal of said load resistor.
Claim 37
Dependent Claim
74 words
An ignition arrangement as defined in claim 34, wherein said electronic switch means includes a thyristor rendered conductive by said control signal, and resistor means in series with said thyristor, said thyristor and resistor means being connected in parallel with said ignition capacitor, and wherein said voltage-operated switch means is connected to the control electrode of said thyristor, and the cathode of said thyristor is connected to the other terminal of said load 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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |