US3714554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for determining the timing of ignition of a cylinder of an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1971-08-09
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Granted: 1973-01-30
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Expires: 1991-08-09
Abstract
Abstract A signal is derived from the primary of the ignition coil. The signal is amplitude limited, has negative portions removed, and is smoothed and extended in time by a determined time interval. The trailing edge of the so-extended signal is steep since it results from cut off from a transistor. The leading edge of the pulse is used to trigger a multivibrator having a negative output signal. The multivibrator signal and the extended signal are applied to an AND gate where the output comprises the extended signal after subtraction of the negative pulse from the multivibrator. The resulting signal has a determined phase angle to the start of the spark and a rectangular shape with sharp leading and trailing edge.
Inventors
- 👤 W Bendix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:44
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
221 words
In a vehicular ignition system having an interruptor switch, a shaft, and means timing the operation of said interruptor switch in dependence upon the angular position of said shaft, an arrangement for furnishing a timing signal indicative of the angle of rotation of said shaft while said interruptor switch is open, comprising, in combination, first signal furnishing means furnishing a first signal upon opening of said interruptor switch and terminating upon reclosure of said interruptor switch; smoothing circuit means connected to said first signal furnishing means and furnishing a second signal at a smoothing output, said second signal starting at a starting time corresponding to the starting time of said first signal, and terminating at a terminating time corresponding to the terminating time of said first signal increased by a predetermined time interval; pulse furnishing means furnishing a first pulse having a first pulse width corresponding to said predetermined time interval upon activation; means activating said pulse furnishing means at a time corresponding to said starting time of said first signal; and logic circuit means having a first input connected to said pulse furnishing means and a second input connected to said smoothing output, said logic circuit means furnishing an output pulse having an output pulse width corresponding to the width of said second signal decreased by said first pulse width.
Claim 2
Dependent Claim
221 words
In a vehicular ignition system having an interruptor switch, a shaft, and means timing the operation of said interruptor switch in dependence upon the angular position of said shaft, an arrangement for furnishing a timing signal indicative of the angle of rotation of said shaft while said interruptor switch is open, comprising, in combination, first signal furnishing means furnishing a first signal upon opening of said interruptor switch and terminating upon reclosure of said interruptor switch; smoothing circuit means connected to said first signal furnishing means and furnishing a second signal at a smoothing output, said second signal starting at a starting time corresponding to the starting time of said first signal, and terminating at a terminating time corresponding to the terminating time of said first signal increased by a predetermined time interval; pulse furnishing means furnishing a first pulse having a first pulse width corresponding to said predetermined time interval upon activation; means activating said pulse furnishing means at a time corresponding to said starting time of said first signal; and logic circuit means having a first input connected to said pulse furnishing means and a second input connected to said smoothing output, said logic circuit means furnishing an output pulse having an output pulse width corresponding to the width of said second signal decreased by said first pulse width.
Claim 3
Dependent Claim
221 words
In a vehicular ignition system having an interruptor switch, a shaft, and means timing the operation of said interruptor switch in dependence upon the angular position of said shaft, an arrangement for furnishing a timing signal indicative of the angle of rotation of said shaft while said interruptor switch is open, comprising, in combination, first signal furnishing means furnishing a first signal upon opening of said interruptor switch and terminating upon reclosure of said interruptor switch; smoothing circuit means connected to said first signal furnishing means and furnishing a second signal at a smoothing output, said second signal starting at a starting time corresponding to the starting time of said first signal, and terminating at a terminating time corresponding to the terminating time of said first signal increased by a predetermined time interval; pulse furnishing means furnishing a first pulse having a first pulse width corresponding to said predetermined time interval upon activation; means activating said pulse furnishing means at a time corresponding to said starting time of said first signal; and logic circuit means having a first input connected to said pulse furnishing means and a second input connected to said smoothing output, said logic circuit means furnishing an output pulse having an output pulse width corresponding to the width of said second signal decreased by said first pulse width.
Claim 4
Dependent Claim
221 words
In a vehicular ignition system having an interruptor switch, a shaft, and means timing the operation of said interruptor switch in dependence upon the angular position of said shaft, an arrangement for furnishing a timing signal indicative of the angle of rotation of said shaft while said interruptor switch is open, comprising, in combination, first signal furnishing means furnishing a first signal upon opening of said interruptor switch and terminating upon reclosure of said interruptor switch; smoothing circuit means connected to said first signal furnishing means and furnishing a second signal at a smoothing output, said second signal starting at a starting time corresponding to the starting time of said first signal, and terminating at a terminating time corresponding to the terminating time of said first signal increased by a predetermined time interval; pulse furnishing means furnishing a first pulse having a first pulse width corresponding to said predetermined time interval upon activation; means activating said pulse furnishing means at a time corresponding to said starting time of said first signal; and logic circuit means having a first input connected to said pulse furnishing means and a second input connected to said smoothing output, said logic circuit means furnishing an output pulse having an output pulse width corresponding to the width of said second signal decreased by said first pulse width.
Claim 5
Dependent Claim
50 words
An arrangement as set forth in claim 1, wherein said ignition system comprises an ignition coil connected to said interruptor switch, said ignition coil having a primary winding and a secondary winding; and wherein said first signal furnishing means comprise connecting means connecting said primary winding to said smoothing means.
Claim 6
Dependent Claim
79 words
An arrangement as set forth in claim 1, wherein said smoothing means comprise an input receiving said first signal; first capacitor means; charging resistance means connecting said first capacitor means to said input; a voltage source having a first and second voltage terminal; discharge resistance means connecting said capacitor to said second voltage terminal; first amplifier means having a first control electrode and a first output circuit; and means connecting said first control electrode to said discharge resistance means.
Claim 7
Dependent Claim
43 words
An arrangement as set forth in claim 3, wherein said pulse furnishing means comprise a monostable multivibrator; and wherein said means activating said pulse furnishing means comprise additional connecting means connecting the input of said monostable multivibrator means to said first output circuit.
Claim 8
Dependent Claim
49 words
An arrangement as set forth in claim 4, wherein said means connecting said first control electrode to said discharge resistance means comprise second amplifier means having a second amplifier output circuit connected to said first control electrode, and a second amplifier control electrode connected to said discharge resistance means.
Claim 9
Dependent Claim
22 words
An arrangement as set forth in claim 5, further comprising negative temperature coefficient resistance means connected to said second amplifier control electrode.
Claim 10
Dependent Claim
20 words
An arrangement as set forth in claim 5, further comprising delay circuit means connected to said second amplifier output circuit.
Claim 11
Dependent Claim
28 words
An arrangement as set forth in claim 7, wherein said delay circuit means comprise a delay capacitor; and delay resistance means connected in series with said delay capacitor.
Claim 12
Dependent Claim
16 words
An arrangement as set forth in claim 7, wherein said additional connecting means comprise inverter means.
Claim 13
Dependent Claim
17 words
An arrangement as set forth in claim 9, wherein said logic circuit means comprise an AND gate.
Claim 14
Dependent Claim
42 words
An arrangement as set forth in claim 10, wherein said first and second amplifier means respectively comprise first and second transistor means, said first and second transistor means respectively having a first and second emitter-collector circUit and a first and second base.
Claim 15
Dependent Claim
54 words
An arrangement as set forth in claim 11, wherein said delay capacitor has a first terminal connected to said collector of said first transistor and a second terminal connected to said voltage terminal; and wherein said delay resistance means is connected between said collector of said first said transistor and said first voltage terminal.
Claim 16
Dependent Claim
70 words
An arrangement as set forth in claim 12, further comprising first diode means having an anode connected to said second voltage terminal and a cathode connected to said charging resistance means; second diode means having an anode connected to said charging resistance means and a cathode; Zener diode means having an anode connected to said second voltage terminal and a cathode connected to said cathode of said second diode means.
References Cited (Backward Citations)
US3289462A
Cited
US3551800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |