US3657601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vital vehicle brake assuring and wheel slip
Assignee: Trane US Inc
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Filing: 1971-02-16
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Granted: 1972-04-18
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Expires: 1991-02-16
Abstract
Abstract A fail-safe deceleration and wheel slip detection circuit which includes a signal generator for producing signals having a frequency proportional to the speed of a vehicle, a converter for converting the frequency of the signals to a proportional voltage signal, a differentiator for differentiating the voltage signal and for producing a rate of change signal, a multivibrator powered by the rate of change signal for producing output signals proportional thereto, an amplifier-rectifier for amplifying and rectifying the output signals, a level detector for measuring the amplitude of the amplified-rectified signals and energizing a utilization device when and only when the amplitude of the signals exceeds a predetermined minimum level, thereby signifying that the vehicle is decelerating at a sufficient rate, and a wheel slip detector for indicating excessive slippage of a wheel of the vehicle.
Inventors
- 👤 John O G Darrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:22
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1705; B60T8/32; B60T8/58; B60T8/72
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A vital electronic circuit arrangement for use in a vehicle speed control system comprising, a signal generator for producing a signal having a frequency proportional to the speed of the vehicle, a converter coupled to said signal generator for translating the frequency of said signal into a voltage signal, a differentiator coupled to said converter for producing an output signal proportional to the rate of change of said voltage signal, an oscillator having a resonant frequency coupled to said differential and powered by said output signal for producing oscillations having an amplitude proportional to the deceleration rate of the vehicle, an amplifier-rectifier for converting said oscillations to a d.c. signal, a detector coupled to said amplifier-rectifier for detecting the level of said d.c. signal and for producing an output when and only when a predeTermined level is reached, a tuned circuit coupled to said oscillator for providing an a.c. output signal only when said oscillator is oscillating at said resonant frequency.
Claim 2
Dependent Claim
161 words
A vital electronic circuit arrangement for use in a vehicle speed control system comprising, a signal generator for producing a signal having a frequency proportional to the speed of the vehicle, a converter coupled to said signal generator for translating the frequency of said signal into a voltage signal, a differentiator coupled to said converter for producing an output signal proportional to the rate of change of said voltage signal, an oscillator having a resonant frequency coupled to said differential and powered by said output signal for producing oscillations having an amplitude proportional to the deceleration rate of the vehicle, an amplifier-rectifier for converting said oscillations to a d.c. signal, a detector coupled to said amplifier-rectifier for detecting the level of said d.c. signal and for producing an output when and only when a predeTermined level is reached, a tuned circuit coupled to said oscillator for providing an a.c. output signal only when said oscillator is oscillating at said resonant frequency.
Claim 3
Dependent Claim
18 words
A vital electronic circuit arrangement as defined in claim 1, wherein said oscillator is an astable oscillating circuit.
Claim 4
Dependent Claim
17 words
A vital electronic circuit arrangement as defined in claim 1, wherein said oscillator is a free-running multivibrator.
Claim 5
Dependent Claim
16 words
A vital electronic circuit arrangement as defined in claim 1, wherein said differentiator includes a capacitor.
Claim 6
Dependent Claim
28 words
A vital electronic circuit arrangement as defined in claim 3, wherein said free-running multivibrator is a pair of NPN transistors which are powered by a negative voltage source.
Claim 7
Dependent Claim
19 words
A vital electronic circuit arrangement as defined in claim 1, wherein a charging path is coupled to said differentiator.
Claim 8
Dependent Claim
21 words
A vital electronic circuit arrangement as defined in claim 6, wherein said charging path includes a diode and a series resistor.
Claim 9
Dependent Claim
18 words
A vital electronic circuit arrangement as defined in claim 3, said free-running multivibrator includes a pair of semiconductors.
Claim 10
Dependent Claim
16 words
A vital electronic circuit arrangement as defined in claim 8, wherein said semiconductors are silicon transistors.
Claim 11
Dependent Claim
34 words
A vital electronic circuit arrangement as defined in claim 1, wherein said tuned circuit includes a parallel resonant circuit including a capacitor and a primary winding of a transistor which includes a secondary winding.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |