Patent US3770327A successfully refreshed from Google Patents.
US3770327A
Expired / Lapsed
US
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Wheel speed transducer frequency doubling circuit
Assignee: Goodyear Tire and Rubber Co
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Filing: 1971-04-21
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Granted: 1973-11-06
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Expires: 1991-04-21
Abstract
Abstract A frequency doubling circuit in combination with an anti-skid control system is presented wherein the alternating current signal output of a wheel speed transducer is trasnformed into a signal having twice the frequency of the wheel speed transducer output and possessing square wave characteristics. Fundamentally, the invention utilizes two series connected operational amplifiers, the first of which transforms the output of the wheel speed transducer into a square wave of the same frequency as the alternating current signal. The second operational amplifier subsequently transforms the square wave into a signal of twice the square wave frequency by causing an operational amplifier to be pulsed at its output on each transition of the square wave signal.
Inventors
- 👤 E Ruof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:08
CPC Classifications
H; H03; H03B; H03B19/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
218 words
In an anti-skid control system having a wheel speed transducer which produces an alternating current signal proportional in frequency to wheel rotation speed, braking means for the wheel, and an anti-skid circuit regulating braking means application in response to the alternating current signal to provide non-skidding braking action, the improvement comprising: first amplifier means receiving the alternating current signal from the wheel speed transducer and producing a square wave siGnal of the same frequency as the alternating current signal; second amplifier means receiving the square wave signal from the first amplifier means and activated by both the leading and trailing edges of said signal to produce a single signal of double the frequency of the alternating current signal, the signal produced by the second amplifier means supplying the input to the anti-skid circuit; and the second amplifier means comprising an operational amplifier and wherein the signal from the first amplifier means is supplied to the second amplifier means through a circuit comprising a capacitor, first and second diodes of opposite polarity in parallel connection between the capacitor and the second amplifier means, a first resistor connected to a positive voltage source and between the first diode and the second amplifier means, and a second resistor connected to ground and between the second diode and the second amplifier means.
Claim 2
Dependent Claim
218 words
In an anti-skid control system having a wheel speed transducer which produces an alternating current signal proportional in frequency to wheel rotation speed, braking means for the wheel, and an anti-skid circuit regulating braking means application in response to the alternating current signal to provide non-skidding braking action, the improvement comprising: first amplifier means receiving the alternating current signal from the wheel speed transducer and producing a square wave siGnal of the same frequency as the alternating current signal; second amplifier means receiving the square wave signal from the first amplifier means and activated by both the leading and trailing edges of said signal to produce a single signal of double the frequency of the alternating current signal, the signal produced by the second amplifier means supplying the input to the anti-skid circuit; and the second amplifier means comprising an operational amplifier and wherein the signal from the first amplifier means is supplied to the second amplifier means through a circuit comprising a capacitor, first and second diodes of opposite polarity in parallel connection between the capacitor and the second amplifier means, a first resistor connected to a positive voltage source and between the first diode and the second amplifier means, and a second resistor connected to ground and between the second diode and the second amplifier means.
Claim 3
Dependent Claim
46 words
The improvement according to claim 1 wherein the time constant of the capacitor and the first resistor and the time constant of the capacitor and the second rsistor are equal and each less than the time between successive edges of the first amplifier means output signal.
Claim 4
Dependent Claim
36 words
The improvement according to claim 1 wherein the first amplifier means is provided with a feedback circuit including a capacitor to sharpen the leading and trailing edges of the output signal of the first amplifier means.
References Cited (Backward Citations)
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |