Patent US2960682A successfully refreshed from Google Patents.
US3758166A
Expired / Lapsed
US
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Process and apparatus for antiskid control mechanism
Assignee: Aisin Corp
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Filing: 1970-10-19
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Granted: 1973-09-11
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Expires: 1990-10-19
Abstract
Abstract This invention presents an improved method and apparatus for an antiskid brake control which provides the shortest possible brake application period and maximum adhesive force between the vehicle tires and the road surface under all conditions by utilizing an electronic circuit into which input signals representing vehicle speed, wheel speed and hydraulic brake apply pressure are fed. The electronics control circuit computes the rate of vehicle deceleration and the ratio of the wheel speed to the vehicle speed and compares this ratio with a constant value. An output signal from the electronic circuit is used to control an electric solenoid valve in the hydraulic brake circuit to modulate the hydraulic pressure and obtain an optimum vehicle braking effort under all conditions and prevent a vehicle skid condition from arising.
Inventors
- 👤 K Kuwana
- 👤 H Yamazaki
- 👤 T Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:41
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
192 words
An antiskid brake control method, comprising the following steps: a. sensing a vehicle wheel speed and generating a wheel speed signal in accordance therewith; b. generating a wheel deceleration or acceleration signal as a function of said wheel speed signal; c. sensing the vehicle speed and generating a vehicle speed signal in accordance therewith; d. generating a control signal as a function of the comparison of said wheel speed signal and said vehicle speed signal when said function exceeds a predetermined slip ratio, modified by said wheel deceleration or acceleration signal, including establishing a reference signal related to a maximum coefficient of adhesion between the wheel and a traffic surface along which said wheel travels, said reference signal being related to the ratio of said wheel speed signal to said vehicle speed signal, establishing a first signal related to said wheel speed signal, and comparing said first signal with said reference signal and said wheel deceleration or acceleration signal to provide said brake pressure control signal; e. controlling said brake pressure in accordance with said control signal whereby the time lag in the reduction or restoration of said brake pressure is eliminated.
Claim 2
Dependent Claim
192 words
An antiskid brake control method, comprising the following steps: a. sensing a vehicle wheel speed and generating a wheel speed signal in accordance therewith; b. generating a wheel deceleration or acceleration signal as a function of said wheel speed signal; c. sensing the vehicle speed and generating a vehicle speed signal in accordance therewith; d. generating a control signal as a function of the comparison of said wheel speed signal and said vehicle speed signal when said function exceeds a predetermined slip ratio, modified by said wheel deceleration or acceleration signal, including establishing a reference signal related to a maximum coefficient of adhesion between the wheel and a traffic surface along which said wheel travels, said reference signal being related to the ratio of said wheel speed signal to said vehicle speed signal, establishing a first signal related to said wheel speed signal, and comparing said first signal with said reference signal and said wheel deceleration or acceleration signal to provide said brake pressure control signal; e. controlling said brake pressure in accordance with said control signal whereby the time lag in the reduction or restoration of said brake pressure is eliminated.
Claim 3
Dependent Claim
17 words
The method of claim 1, including adding said wheel deceleration or acceleration signal to said reference signal.
Claim 4
Dependent Claim
54 words
The method of claim 2 wherein said reference signal is obtained by modifying said vehicle speed signal to a value of wheel speed signal corresponding to a maximum coefficient of adhesion between the wheel and a traffic surface along which the wheel is travelling, and wherein said first signal is the vehicle wheel speed.
Claim 5
Dependent Claim
62 words
The method of claim 2, wherein said reference signal is a ratio between the vehicle speed and the wheel speed corresponding to a maximum coefficient of adhesion between the wheel and a traffic surface along which the wheel is travelling and wherein said first signal is a value corresponding to a ratio of said vehicle speed signal to said wheel speed signal.
Claim 6
Dependent Claim
32 words
The method of claim 2, further comprising a step for increasing the hydraulic brake pressure reduction or restoration rate when the variation in the wheel speed is larger than a predetermined value.
Claim 7
Dependent Claim
30 words
The method of claim 5, wherein said variation in said wheel speed to be compared with said predetermined value is sensed from the absolute value of said wheel deceleration signal.
Claim 8
Dependent Claim
43 words
The method of claim 5, wherein said variation in said wheel speed to be compared with said predetermined value is sensed from the absolute value of (wheel speed signal divided by vehicle speed signal) minus (reference signal) plus (wheel deceleration or acceleration signal).
Claim 9
Dependent Claim
36 words
The method of claim 5, wherein said predetermined value is modified at a high frequency such that the braking pressure reduction or restoration period is variable and the braking pressure reduction anD restoration is substantially stepless.
Claim 10
Dependent Claim
43 words
The method of claim 8, wherein the variation in said wheel speed to be compared with said high frequency is sensed from the absolute value of (wheel speed signal divided by vehicle speed signal) minus (reference signal) plus (wheel deceleration or acceleration signal).
Claim 11
Dependent Claim
31 words
The method of claim 8, wherein said variation in said wheel speed to be compared with said high frequency is sensed from the absolute value of said wheel deceleration or acceleration.
Claim 12
Dependent Claim
186 words
An antiskid brake control apparatus comprising: a. first circuit means for detecting a wheel speed from a generator which delivers a voltage responsive to the rotational speed of a vehicle wheel and for producing an output indicative of the wheel speed; b. second circuit means for generating a vehicle wheel deceleration or acceleration signal from the wheel speed signal; c. third circuit means for generating a vehicle speed signal by modifying the output signal from said first circuit means with the hydraulic pressure in a wheel cylinder attached to said vehicle wheel; d. fourth circuit means for generating a reference signal related to the maximum coefficient of adhesion between the wheel and the traffic surface along which said wheel travels said reference signal being related to the ratio of said wheel speed signal relative to said vehicle speed signal; e. fifth circuit means for adding said wheel deceleration or acceleration signal to said reference signal; and f. sixth circuit means for comparing the output signal from said fifth circuit with a signal related to said wheel speed signal thereby determining the direction of brake pressure control.
Claim 13
Dependent Claim
186 words
An antiskid brake control apparatus comprising: a. first circuit means for detecting a wheel speed from a generator which delivers a voltage responsive to the rotational speed of a vehicle wheel and for producing an output indicative of the wheel speed; b. second circuit means for generating a vehicle wheel deceleration or acceleration signal from the wheel speed signal; c. third circuit means for generating a vehicle speed signal by modifying the output signal from said first circuit means with the hydraulic pressure in a wheel cylinder attached to said vehicle wheel; d. fourth circuit means for generating a reference signal related to the maximum coefficient of adhesion between the wheel and the traffic surface along which said wheel travels said reference signal being related to the ratio of said wheel speed signal relative to said vehicle speed signal; e. fifth circuit means for adding said wheel deceleration or acceleration signal to said reference signal; and f. sixth circuit means for comparing the output signal from said fifth circuit with a signal related to said wheel speed signal thereby determining the direction of brake pressure control.
Claim 14
Dependent Claim
55 words
The apparatus of claim 11, wherein said third circuit means comprises a charging circuit means for charging in response to the output signal from said first circuit means; means for sensing the hydraulic pressure in said vehicle wheel cylinder; and a discharge circuit means for discharging said charging means in accordance with the hydraulic pressure.
Claim 15
Dependent Claim
54 words
The apparatus of claim 11, wherein said fourth circuit means comprises a voltage divider circuit for dividing the vehicle speed into a value corresponding to a wheel speed signal representing a maximum coefficient of adhesion, and wherein said sixth circuit means compares the output of said fifth circuit means with the wheel speed signal.
Claim 16
Dependent Claim
42 words
The apparatus of claim 13, comprising eighth circuit means for comparing the absolute value of said wheel deceleration or acceleration signal with said reference signal and for reducing or restoring the hydraulic brake pressure in two stages in accordance with said comparison.
Claim 17
Dependent Claim
40 words
The apparatus of claim 14, wherein said eight circuit means comprises a solenoid means for speeding-up the hydraulic brake pressure reduction or restoration, upon being energized in response to the wheel deceleration or acceleration being larger than said reference signal.
Claim 18
Dependent Claim
60 words
The apparatus of claim 13, comprising ninth circuit means for generating a series of triangular signal waves; and tenth circuit means for comparing the absolute value of said wheel deceleration or acceleration signal with the output signal from said ninth circuit means such that the rate of hydraulic brake pressure decrease or increase is varied by said sixth circuit means.
Claim 19
Dependent Claim
49 words
The apparatus of claim 16, wherein said tenth circuit means comprises a solenoid energized when the absolute value of said wheel speed deceleration or acceleration signal is less than the output signal from said ninth circuit means whereby the rate of hydraulic braking pressure decrease or increase is increased.
Claim 20
Dependent Claim
52 words
The apparatus of claim 13, further including a valve drive circuit comprising an astable multivibrator for generating a series of pulse signals of a certain predetermined cycle; and a monostable multivibrator controlled by said wheel deceleration or acceleration signal, wherein the rate of the hydraulic brake pressure decrease or increase is variAble.
Claim 21
Dependent Claim
72 words
The apparatus of claim 11, further comprising seventh circuit means for providing a signal corresponding to the ratio of said vehicle speed signal to said wheel speed signal wherein said reference signal corresponds to a specific ratio of said vehicle speed signal to said wheel speed signal for a maximum coefficient of adhesion, and wherein said sixth circuit means compares the output of said fifth circuit means and said seventh circuit means.
Claim 22
Dependent Claim
109 words
The apparatus of claim 19, wherein said seventh circuit means comprises a first magnetic resistor means, the resistance of which is variable with variation in the intensity of a first solenoid energizable in response to the output signal from said third circuit means; a second magnetic resistor means, the resistance of which is variable with variation in the intensity of a magnetic field of a second solenoid energizable in response to the output signal from said first circuit means; and an amplifier means for producing a signal corresponding to a ratio of the resistance value of said second magnetic resistor means to that of said first magnetic resistor means.
Claim 23
Dependent Claim
64 words
The apparatus of claim 19, further comprising eighth circuit means for comparing the absolute value of the output of said seventh circuit means minus the output of said fifth circuit means to said reference signal, whereby the reduction or restoration of the hydraulic brake pressure occurs in two stages wherein the reduction or restoration is determined by the output of said sixth circuit means.
Claim 24
Dependent Claim
58 words
The apparatus of claim 21, wherein said eighth circuit means comprises a solenoid means energized when the absolute value of the difference between the output of said seventh circuit means minus the output of said fifth circuit means is larger than said reference signal whereby the rate of the hydraulic braking pressure decrease or increase is correspondingly changed.
Claim 25
Dependent Claim
69 words
The apparatus of claim 19, comprising ninth circuit means for generating a series of triangular signal waves; and tenth circuit means for comparing the absolute value of the output signal of said seventh circuit means, minus the output signal of said fifth circuit means with said reference signal whereby the rate of the hydraulic braking pressure increases or decreases in accordance with the output of said sixth circuit means.
Claim 26
Dependent Claim
71 words
The apparatus of claim 19, further including a valve drive circuit comprising an astable multivibrator for generation of regular pulses of a certain constant cycle; and a monostable multivibrator controlled by the absolute value of the output signal from said seventh circuit means minus the output signal from said fifth circuit means and the output of said astable multivibrator, whereby the hydraulic brake pressure increase or decrease rate is made variable.
Claim 27
Dependent Claim
44 words
The apparatus of claim 11, wherein said sixth circuit means comprises a solenoid energized when the output signal of said fifth circuit means is larger than the signal related to said wheel speed signal, the hydraulic brake pressure decreasing when said solenoid is energized.
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |