US3650575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antiskid device
Assignee: Denso Corp
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Filing: 1970-04-13
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Granted: 1972-03-21
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Expires: 1990-04-13
Abstract
Abstract An anti-skid device for automobiles comprising apparatus for converting the wheel speed into a DC voltage, apparatus for producing from the output of said converter a first wheel speed voltage and a second wheel speed voltage higher than said first wheel speed voltage, a capacitor adapted to be charged by said first wheel speed voltage, a discharging circuit for discharging the charge in said capacitor with a time constant corresponding to a preset reference wheel speed, a braking force release unit, switch apparatus for controlling the operation of said braking force release unit, an actuating apparatus consisting of a voltage comparator circuit and an amplifier circuit for actuating said switch apparatus, and a pulse generating circuit for producing pulses to control the actuating apparatus.
Inventors
- 👤 Atutoshi Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:59
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
219 words
An antiskid device for automobiles comprising: means for detecting a wheel speed, means connected to the output of said means for detecting for producing at least two wheel speed signals, each corresponding to one of a plurality of wheel speed levels of the detected wheel speed, means for at least temporarily storing one of said wheel speed signals, means for converting said one stored signal into a preset wheel speed signal corresponding to a preset wheel speed, a braking force release unit, switch means for controlling the operation of said braking force release unit, an actuating circuit for actuating said switch means and comprising a signal comparator circuit means connected to compare said wheel speed signals with said preset wheel speed signal and an amplifier circuit connected to the output of said comparator, and a pulse generating circuit means connected to said signal comparator circuit means for producing pulses to control said actuating circuit, whereby, when said wheel speEd signals of different levels reach signal voltage values corresponding to the preset wheel speeds, said actuating circuit intermittently closes said switch means at different intervals respectively corresponding to the different wheel speed signal levels so that ultimately said actuating circuit continuously closes said switch means when all of said wheel speed signals are less than the preset wheel speed signal.
Claim 2
Dependent Claim
219 words
An antiskid device for automobiles comprising: means for detecting a wheel speed, means connected to the output of said means for detecting for producing at least two wheel speed signals, each corresponding to one of a plurality of wheel speed levels of the detected wheel speed, means for at least temporarily storing one of said wheel speed signals, means for converting said one stored signal into a preset wheel speed signal corresponding to a preset wheel speed, a braking force release unit, switch means for controlling the operation of said braking force release unit, an actuating circuit for actuating said switch means and comprising a signal comparator circuit means connected to compare said wheel speed signals with said preset wheel speed signal and an amplifier circuit connected to the output of said comparator, and a pulse generating circuit means connected to said signal comparator circuit means for producing pulses to control said actuating circuit, whereby, when said wheel speEd signals of different levels reach signal voltage values corresponding to the preset wheel speeds, said actuating circuit intermittently closes said switch means at different intervals respectively corresponding to the different wheel speed signal levels so that ultimately said actuating circuit continuously closes said switch means when all of said wheel speed signals are less than the preset wheel speed signal.
Claim 3
Dependent Claim
31 words
An antiskid device for automobiles according to claim 1, wherein the signal voltage value corresponding to the preset wheel speed is varied in relation to wheel speed signals of different levels.
Claim 4
Dependent Claim
212 words
An antiskid device for automobiles comprising: means for converting a wheel speed into a DC voltage, means for producing from the output of said means for converting, a first wheel speed voltage and a second wheel speed voltage higher than said first wheel speed voltage, both being proportional to the DC voltage, a capacitor connected for charging by said first wheel speed voltage, a discharging circuit connected for discharging the charge in said capacitor with a time constant corresponding to a preset reference wheel speed, a braking force release unit, switch means for controlling the operation of said braking force release unit, an actuating means connected for actuating said switch means and comprising a voltage comparator circuit means for comparing said first and said second wheel speed voltages with the voltage across said capacitor and an amplifier circuit connected to the output thereof, and a pulse generating circuit means connected to said comparator means for generating pulses to control said actuating means, whereby said actuating means intermittently closes said switch means at regular intervals when said first wheel speed voltage becomes lower than the voltage across said capacitor, and said actuating means continuously closes said switch means when said second wheel speed voltage also becomes lower than the voltage across said capacitor.
Claim 5
Dependent Claim
212 words
An antiskid device for automobiles comprising: means for converting a wheel speed into a DC voltage, means for producing from the output of said means for converting, a first wheel speed voltage and a second wheel speed voltage higher than said first wheel speed voltage, both being proportional to the DC voltage, a capacitor connected for charging by said first wheel speed voltage, a discharging circuit connected for discharging the charge in said capacitor with a time constant corresponding to a preset reference wheel speed, a braking force release unit, switch means for controlling the operation of said braking force release unit, an actuating means connected for actuating said switch means and comprising a voltage comparator circuit means for comparing said first and said second wheel speed voltages with the voltage across said capacitor and an amplifier circuit connected to the output thereof, and a pulse generating circuit means connected to said comparator means for generating pulses to control said actuating means, whereby said actuating means intermittently closes said switch means at regular intervals when said first wheel speed voltage becomes lower than the voltage across said capacitor, and said actuating means continuously closes said switch means when said second wheel speed voltage also becomes lower than the voltage across said capacitor.
Claim 6
Dependent Claim
33 words
An antiskid device for automobiles according to claim 3, wherein the time constant of said discharging circuit is lengthened when said second wheel speed voltage becomes lower than the voltage across said capacitor.
Claim 7
Dependent Claim
38 words
An antiskid device for automobiles according to claim 3, wherein said pulse generating circuit means comprises: a plurality of switching transistors, a discharging circuit for determining the pulse width, and another discharging circuit for determining the pulse interval.
Claim 8
Dependent Claim
217 words
An antiskid device for automobiles comprising means for converting a wheel speed into a DC voltage, means for producing from the output of said converter means a first wheel speed voltage, a second wheel speed voltage which is higher than said first wheel speed voltage and a third wheel speed voltage which is higher than said second wheel speed voltage, a capacitor adapted to be charged by said first wheel speed voltage, a discharging circuit for discharging the charge in said capacitor with a time constant corresponding to a preset reference wheel speed, a braking force release unit, switch means for controlling the operation of said braking force release unit, actuating means consisting of a comparator circuit and an amplifier circuit for producing a pulse to actuate said switch means, and a pulse generating circuit for producing pulses to control said actuating means, whereby said actuating means intermittently closes said switch means at regular intervals when said first wheel speed voltage becomes lower than the voltage across said capacitor, said actuating means intermittently closes said switch means at shorter intervals when said second wheel speed voltage becomes lower than the voltage across said capacitor, and said actuating means continuously closes said switch means when said third wheel speed voltage becomes lower than the voltage across said capacitor.
Claim 9
Dependent Claim
217 words
An antiskid device for automobiles comprising means for converting a wheel speed into a DC voltage, means for producing from the output of said converter means a first wheel speed voltage, a second wheel speed voltage which is higher than said first wheel speed voltage and a third wheel speed voltage which is higher than said second wheel speed voltage, a capacitor adapted to be charged by said first wheel speed voltage, a discharging circuit for discharging the charge in said capacitor with a time constant corresponding to a preset reference wheel speed, a braking force release unit, switch means for controlling the operation of said braking force release unit, actuating means consisting of a comparator circuit and an amplifier circuit for producing a pulse to actuate said switch means, and a pulse generating circuit for producing pulses to control said actuating means, whereby said actuating means intermittently closes said switch means at regular intervals when said first wheel speed voltage becomes lower than the voltage across said capacitor, said actuating means intermittently closes said switch means at shorter intervals when said second wheel speed voltage becomes lower than the voltage across said capacitor, and said actuating means continuously closes said switch means when said third wheel speed voltage becomes lower than the voltage across said capacitor.
Claim 10
Dependent Claim
33 words
An antiskid device for automobiles according to claim 6, wherein the time Constant of said discharging circuit is lengthened when said third wheel speed voltage becomes lower than the voltage across said capacitor.
Claim 11
Dependent Claim
94 words
An antiskid device for motor vehicles, having braking force releasing means comprising: means for providing first and second DC voltages which are each proportional to a wheel speed of said vehicle, said first DC voltage being lower than said second DC voltage; means for producing a reference voltage derived from said first DC voltage, said reference voltage being discharged with a preset time constant; means for actuating said braking force releasing means intermittently when said reference voltage exceeds said first DC voltage and continuously when said reference voltage also exceeds said second DC voltage.
Claim 12
Dependent Claim
94 words
An antiskid device for motor vehicles, having braking force releasing means comprising: means for providing first and second DC voltages which are each proportional to a wheel speed of said vehicle, said first DC voltage being lower than said second DC voltage; means for producing a reference voltage derived from said first DC voltage, said reference voltage being discharged with a preset time constant; means for actuating said braking force releasing means intermittently when said reference voltage exceeds said first DC voltage and continuously when said reference voltage also exceeds said second DC voltage.
Claim 13
Dependent Claim
28 words
An antiskid device for motor vehicles as in claim 8 further including means for changing said preset time constant when said reference voltage exceeds said second DC voltage.
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |