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US3825799A
Expired / Lapsed
US
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Anti-skid control system for vehicles
Assignee: Sogo Jidosha Anzen Kogai Gijutsu Kenkyu Kumiai
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Filing: 1973-08-02
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Granted: 1974-07-23
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Expires: 1993-08-02
Abstract
Abstract An anti-skid control system for vehicles comprising a wheel speed detector, a converter consisting of a pulse generator and an integrator, an approximate vehicle body speed signal generator including an RC discharge circuit, and a comparator for comparing the output of the approximate vehicle body speed signal generator with the output of the converter for energizing and deenergizing a solenoid operated valve in the brake fluid pressure control means. The integrator includes a charging resistor and a discharging resistor whose resistance ratio is suitably selected so that the output of the converter varies substantially as an exponential function of the input frequency applied thereto thereby obtaining an approximate vehicle body speed having substantially constant deceleration.
Inventors
- 👤 Y Matsumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:38
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/173
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
233 words
An anti-skid control system for vehicles comprising wheel speed detecting means for generating a signal having a frequency proportional to the rotating speed of the wheel or propeller shaft, converting means consisting of means for generating a train of pulses having a frequency proportional to the frequency of the signal generated by said wheel speed detecting means and integrating means connected to the output of said pulse train generating means for converting the signal representative of the rotating speed of the wheel or propeller shaft into a d.c. voltage, approximate vehicle body speed signal generating means including an RC discharge circuit for generating a signal representative of an approximate vehicle body speed due to the discharge occurring in the RC discharge circuit when the rate of reduction of the output of said converting means exceeds the discharge gradient determined by the time constant of said RC discharge circuit, and comparing means for comparing the output of said approximate vehicle body speed signal generating means with the output of said converting means, said integrating means including a charging resistor and a discharging resistor having a suitably selected resistance ratio therebetween so that the output voltage of said converting means can vary approximately as an exponential function of the input frequency applied thereto, whereby the approximate vehicle body speed having substantially constant deceleration can be obtained by the discharge occurring in said RC discharge circuit.
Claim 2
Dependent Claim
233 words
An anti-skid control system for vehicles comprising wheel speed detecting means for generating a signal having a frequency proportional to the rotating speed of the wheel or propeller shaft, converting means consisting of means for generating a train of pulses having a frequency proportional to the frequency of the signal generated by said wheel speed detecting means and integrating means connected to the output of said pulse train generating means for converting the signal representative of the rotating speed of the wheel or propeller shaft into a d.c. voltage, approximate vehicle body speed signal generating means including an RC discharge circuit for generating a signal representative of an approximate vehicle body speed due to the discharge occurring in the RC discharge circuit when the rate of reduction of the output of said converting means exceeds the discharge gradient determined by the time constant of said RC discharge circuit, and comparing means for comparing the output of said approximate vehicle body speed signal generating means with the output of said converting means, said integrating means including a charging resistor and a discharging resistor having a suitably selected resistance ratio therebetween so that the output voltage of said converting means can vary approximately as an exponential function of the input frequency applied thereto, whereby the approximate vehicle body speed having substantially constant deceleration can be obtained by the discharge occurring in said RC discharge circuit.
Claim 3
Dependent Claim
86 words
An anti-skid control system as claimed in claim 1, wherein said approximate vehicle body speed signal generating means comprises a capacitor to be charged and discharged, discharging resistors for said capacitor, and a transistor which charges said capacitor depending on the output of said converting means but prevents discharge of said capacitor to said converting means, and said discharging resistors are selectively actuated for changing over the discharge gradient for the voltage representative of the approximate vehicle body speed depending on the detected vehicle body deceleration.
Claim 4
Dependent Claim
97 words
An anti-skid control system as claimed in claim 1, wherein said approximate vehicle body speed signal generating means comprises a capacitor to be charged and discharged, discharging resistors for said capacitor, and a transistor which charges said capacitor depending on the output of said converting means but prevents discharge of said capacitor to said converting means, and the discharge gradient of the voltage representative of the approximate vehicle body speed is changed over to a greater value wHen the brake relaxing signal appears from said comparing means and lasts for more than a predetermined period of time.
Claim 5
Dependent Claim
113 words
An anti-skid control system as claimed in claim 1, wherein said approximate vheicle body speed signal generating means comprises a capacitor to be charged and discharged, discharging resistors for said capacitor, and a transistor which charges said capacitor depending on the output of said converting means but prevents discharge of said capacitor to said converting means, and the discharge gradient for the voltage representative of the approximate vehicle body speed is changed over to and maintained at a greater value than that used in the case of the application of the brake when no brake is applied to the vehicle and during a predetermined period of time after the application of the brake.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |