US3744855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skid control device
Assignee: Toyota Motor Corp
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Filing: 1971-11-04
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Granted: 1973-07-10
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Expires: 1991-11-04
Abstract
Abstract A skid control device comprising a wheel velocity detector for generating a wheel velocity voltage, a controller and a pressure modulator. The controller comprises a wheel velocity setting apparatus adapted to generate a pressure reducing signal and a pressure applying signal by detecting the deceleration of wheel velocity encountered during braking, the deceleration curve having a set gradient. The controller also comprises a first correcting apparatus adapted to correct the set gradient so as to decrease it in accordance with the increase in wheel velocity, and a second correcting apparatus adapted to correct the set gradient so as to increase it. The pressure modulator comprises a pressure modulating apparatus adapted to change the pressure of braking fluid of the wheel cylinder, and a change-over valve and a throttle valve which are adapted to actuate the pressure modulating apparatus so that the pressure of braking fluid is decreased upon receiving the pressure reducing signal and the thusly decreased pressure of braking fluid is increased again at a different speed upon receiving the pressure applying signal.
Inventors
- 👤 T Ochiai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:43
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633; B60T8/32; B60T8/72
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
454 words
A skid control device for a vehicle having at least one wheel provided with braking means actuated by braking fluid comprising a. a detector coupled to said wheel for generating a wheel velocity voltage corresponding to the velocity of said wheel, b. controller means having first and second outputs comprising 1. wheel velocity setting means coupled to said detector for receiving said wheel velocity voltage and generating a deceleration voltage which decreases in accordance with a set gradient, said wheel velocity setting means further generating a pressure applying signal during the period from the time when said wheel velocity voltage exceeds said deceleration voltage until the time when said wheel velocity voltage reaches a maximum, 2. a first correcting means coupled to said wheel velocity setting means for receiving said pressure applying signal, said first correcting means decreasing said set gradient by an amount corresponding to the increase in wheel velocity voltage during the time when said wheel velocity voltage is increasing and has a magnitude greater than that of said deceleration voltage, 3. a second correcting means coupled to said first correcting means for increasing said set gradient to a predetermined value during the period from the time when said wheel velocity voltage reaches a maximum until a time when the magnitude of said wheel velocity voltage corresponds to the magnitude of said deceleration voltage, 4. means coupling said deceleration voltage to the first and second outputs of said controller when the magnitude of said wheel velocity voltage is lower than the magnitude of said deceleration voltage, and 5. means coupling said pressure applying signal to the second output of said controller, and c. a pressure modulator having an input coupled to the first and second outputs of said controller for regulating the flow of braking fluid to said braking means, said pressure modulator sequeNtially (i) decreasing the pressure of said braking fluid in response to signals at the first and second outputs of said controller during the period from the time when the magnitude of said wheel velocity voltage becomes lower than the magnitude of said deceleration voltage until the time when the wheel velocity voltage becomes equal to said deceleration voltage, (ii) increasing the pressure of said braking fluid in response to a signal at said second output only during the period when the magnitude of said wheel velocity voltage is increasing and exceeds that of said deceleration voltage, and (iii) decreasing the pressure applying speed of said braking fluid in the absence of signals at the first and second outputs of said controller during the period from the time when said wheel velocity voltage begins decreasing until the time when its magnitude becomes less than that of said deceleration voltage.
Claim 2
Dependent Claim
454 words
A skid control device for a vehicle having at least one wheel provided with braking means actuated by braking fluid comprising a. a detector coupled to said wheel for generating a wheel velocity voltage corresponding to the velocity of said wheel, b. controller means having first and second outputs comprising 1. wheel velocity setting means coupled to said detector for receiving said wheel velocity voltage and generating a deceleration voltage which decreases in accordance with a set gradient, said wheel velocity setting means further generating a pressure applying signal during the period from the time when said wheel velocity voltage exceeds said deceleration voltage until the time when said wheel velocity voltage reaches a maximum, 2. a first correcting means coupled to said wheel velocity setting means for receiving said pressure applying signal, said first correcting means decreasing said set gradient by an amount corresponding to the increase in wheel velocity voltage during the time when said wheel velocity voltage is increasing and has a magnitude greater than that of said deceleration voltage, 3. a second correcting means coupled to said first correcting means for increasing said set gradient to a predetermined value during the period from the time when said wheel velocity voltage reaches a maximum until a time when the magnitude of said wheel velocity voltage corresponds to the magnitude of said deceleration voltage, 4. means coupling said deceleration voltage to the first and second outputs of said controller when the magnitude of said wheel velocity voltage is lower than the magnitude of said deceleration voltage, and 5. means coupling said pressure applying signal to the second output of said controller, and c. a pressure modulator having an input coupled to the first and second outputs of said controller for regulating the flow of braking fluid to said braking means, said pressure modulator sequeNtially (i) decreasing the pressure of said braking fluid in response to signals at the first and second outputs of said controller during the period from the time when the magnitude of said wheel velocity voltage becomes lower than the magnitude of said deceleration voltage until the time when the wheel velocity voltage becomes equal to said deceleration voltage, (ii) increasing the pressure of said braking fluid in response to a signal at said second output only during the period when the magnitude of said wheel velocity voltage is increasing and exceeds that of said deceleration voltage, and (iii) decreasing the pressure applying speed of said braking fluid in the absence of signals at the first and second outputs of said controller during the period from the time when said wheel velocity voltage begins decreasing until the time when its magnitude becomes less than that of said deceleration voltage.
Claim 3
Dependent Claim
57 words
a first correcting means coupled to said wheel velocity setting means for receiving said pressure applying signal, said first correcting means decreasing said set gradient by an amount corresponding to the increase in wheel velocity voltage during the time when said wheel velocity voltage is increasing and has a magnitude greater than that of said deceleration voltage,
Claim 4
Dependent Claim
57 words
a first correcting means coupled to said wheel velocity setting means for receiving said pressure applying signal, said first correcting means decreasing said set gradient by an amount corresponding to the increase in wheel velocity voltage during the time when said wheel velocity voltage is increasing and has a magnitude greater than that of said deceleration voltage,
Claim 5
Dependent Claim
79 words
A skid control device as defined by claim 1, wherein said wheel velocity setting means comprises first and second transistors, a first capacitor and a first resistor, the collector - emitter circuit of said first transistor being connected in series with said first resistor and said first capacitor across a voltage source, the base of said first transistor being connected to said detector, and the collector - emitter circuit of said second transistor being coupled across said first capacitor.
Claim 6
Dependent Claim
111 words
A skid control device as defined by claim 2, wherein said first correcting means comprises third and fourth transistors, a second capacitor and a second resistor, the collector - emitter circuit of said third transistor being connected in series with said second resistor across said voltage source, said second capacitor being connected between one terminal of said voltage source and the base of said second transistor and the collector -emitter circuit of said fourth transistor being connected between the base of said second transistor and the other terminal of said voltage source, the base of said fourth transistor being connected to the junction between said second resistor and said third transistor.
Claim 7
Dependent Claim
52 words
a second correcting means coupled to said first correcting means for increasing said set gradient to a predetermined value during the period from the time when said wheel velocity voltage reaches a maximum until a time when the magnitude of said wheel velocity voltage corresponds to the magnitude of said deceleration voltage,
Claim 8
Dependent Claim
52 words
a second correcting means coupled to said first correcting means for increasing said set gradient to a predetermined value during the period from the time when said wheel velocity voltage reaches a maximum until a time when the magnitude of said wheel velocity voltage corresponds to the magnitude of said deceleration voltage,
Claim 9
Dependent Claim
32 words
means coupling said deceleration voltage to the first and second outputs of said controller when the magnitude of said wheel velocity voltage is lower than the magnitude of said deceleration voltage, and
Claim 10
Dependent Claim
32 words
means coupling said deceleration voltage to the first and second outputs of said controller when the magnitude of said wheel velocity voltage is lower than the magnitude of said deceleration voltage, and
Claim 11
Dependent Claim
23 words
A skid control device as defined by claim 3, wherein said second correcting means comprises a third resistor coupled across said second capacitor.
Claim 12
Dependent Claim
201 words
A skid control device as defined by claim 1, wherein said pressure modulator comprises pressure modulating means and a control valve for regulating the amount of braking fluid actuating said braking means; a change-over valve having a first electromagnetic coil actuated by a signal at the first output of said controller for controlling the relative pressures in the first and second cylinder portions of said pressure modulating means, said change-over valve equalizing the pressure in said cylinder portions when said electromagnetic valve is de-energized in the absence of a signal at said first output to open said control valve and changing the pressure in one of said cylinder portions when said electromagnetic valve is energized by the signal at said first output to close said control valve; and a throttle valve having a second electromagnetic coil actuated by the signal at said second output of said controller interposed between said change-over valve and said first cylinder portion, said throttle valve throttling the fluid flow between said change-over valve and said first cylinder portion in the absence of a signal at said second output and permitting unrestricted flow when said second electromagnetic coil is energized by a signal at said second output.
Claim 13
Dependent Claim
194 words
means coupling said pressure applying signal to the second output of said controller, and c. a pressure modulator having an input coupled to the first and second outputs of said controller for regulating the flow of braking fluid to said braking means, said pressure modulator sequeNtially (i) decreasing the pressure of said braking fluid in response to signals at the first and second outputs of said controller during the period from the time when the magnitude of said wheel velocity voltage becomes lower than the magnitude of said deceleration voltage until the time when the wheel velocity voltage becomes equal to said deceleration voltage, (ii) increasing the pressure of said braking fluid in response to a signal at said second output only during the period when the magnitude of said wheel velocity voltage is increasing and exceeds that of said deceleration voltage, and (iii) decreasing the pressure applying speed of said braking fluid in the absence of signals at the first and second outputs of said controller during the period from the time when said wheel velocity voltage begins decreasing until the time when its magnitude becomes less than that of said deceleration voltage.
Claim 14
Dependent Claim
194 words
means coupling said pressure applying signal to the second output of said controller, and c. a pressure modulator having an input coupled to the first and second outputs of said controller for regulating the flow of braking fluid to said braking means, said pressure modulator sequeNtially (i) decreasing the pressure of said braking fluid in response to signals at the first and second outputs of said controller during the period from the time when the magnitude of said wheel velocity voltage becomes lower than the magnitude of said deceleration voltage until the time when the wheel velocity voltage becomes equal to said deceleration voltage, (ii) increasing the pressure of said braking fluid in response to a signal at said second output only during the period when the magnitude of said wheel velocity voltage is increasing and exceeds that of said deceleration voltage, and (iii) decreasing the pressure applying speed of said braking fluid in the absence of signals at the first and second outputs of said controller during the period from the time when said wheel velocity voltage begins decreasing until the time when its magnitude becomes less than that of said deceleration voltage.
Claim 15
Independent Claim
207 words
The method of controlling skidding in a vehicle during slowing thereof having at least one wheel provided with braking means actuated by braking fluid comprising a. detecting the speed of said wheel, b. generating a deceleration curve having a set gradient, c. comparing the deceleration of said wheel during slowing of said vehicle with said deceleration curve, d. decreasing the pressure of said braking fluid when the deceleration of said wheel beComes greater than said set gradient until the wheel velocity exceeds the magnitude of said deceleration curve, e. increasing the pressure of said braking fluid when the wheel velocity is increasing and exceeds the magnitude of said deceleration curve, f. decreasing said set gradient by an amount corresponding to the increase in wheel velocity when the wheel velocity is increasing and exceeds the magnitude of said deceleration curve, g. decreasing the pressure applying speed of said braking fluid during the period from the time when said wheel velocity begins decreasing until the time when its magnitude becomes less than that of said deceleration curve, and h. increasing said set gradient to a predetermined value during the period from the time when the wheel velocity reaches a maximum to a time when it equals said deceleration curve.
Claim 16
Independent Claim
207 words
The method of controlling skidding in a vehicle during slowing thereof having at least one wheel provided with braking means actuated by braking fluid comprising a. detecting the speed of said wheel, b. generating a deceleration curve having a set gradient, c. comparing the deceleration of said wheel during slowing of said vehicle with said deceleration curve, d. decreasing the pressure of said braking fluid when the deceleration of said wheel beComes greater than said set gradient until the wheel velocity exceeds the magnitude of said deceleration curve, e. increasing the pressure of said braking fluid when the wheel velocity is increasing and exceeds the magnitude of said deceleration curve, f. decreasing said set gradient by an amount corresponding to the increase in wheel velocity when the wheel velocity is increasing and exceeds the magnitude of said deceleration curve, g. decreasing the pressure applying speed of said braking fluid during the period from the time when said wheel velocity begins decreasing until the time when its magnitude becomes less than that of said deceleration curve, and h. increasing said set gradient to a predetermined value during the period from the time when the wheel velocity reaches a maximum to a time when it equals said deceleration curve.
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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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |