Patent US1238874A successfully refreshed from Google Patents.
Patent US3756662A successfully refreshed from Google Patents.
US3756662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the control of an antiskid braking system, and apparatus adapted for performing the same
Assignee: Aisin Corp
•
Filing: 1970-10-19
•
Granted: 1973-09-04
•
Expires: 1990-10-19
Abstract
Abstract This invention presents an improved antiskid brake control method and apparatus for wheeled automotive vehicles which utilizes an electronic circuit into which input signals representing vehicle speed, wheel speed and hydraulic brake apply pressure are fed. The electronic 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
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:51
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633; B60T8/34; B60T8/50; B60T8/5018; B60T8/5025; B60T8/5037; B60T8/5043; B60T8/5087; B60T8/5093
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A method for controlling the brake pressure in an antiskid brake control system in a vehicle comprising: a. generating a wheel speed signal indicative of the speed of a wheel of said vehicle; b. generating a pseudo vehicle speed signal indicative of the speed of said vehicle; c. generating a wheel deceleration or acceleration signal indicative of said wheel deceleration or acceleration; d. establishing a reference signal which is a function of said wheel speed signal and said pseudo vehicle speed signal at the maximum coefficient of adhesion between the wheel and the surface on which the vehicle is travelling; e. generating a first comparison signal which is a function of said wheel speed signal; f. generating a second comparison signal by adding said wheel deceleration or acceleration signal and said reference signal; g. generating a control signal by comparing said first and second comparison signals for controlling the brake pressure; and h. varying said brake pressure in a continuous manner in accordance with said control signal.
Claim 2
Independent Claim
167 words
A method for controlling the brake pressure in an antiskid brake control system in a vehicle comprising: a. generating a wheel speed signal indicative of the speed of a wheel of said vehicle; b. generating a pseudo vehicle speed signal indicative of the speed of said vehicle; c. generating a wheel deceleration or acceleration signal indicative of said wheel deceleration or acceleration; d. establishing a reference signal which is a function of said wheel speed signal and said pseudo vehicle speed signal at the maximum coefficient of adhesion between the wheel and the surface on which the vehicle is travelling; e. generating a first comparison signal which is a function of said wheel speed signal; f. generating a second comparison signal by adding said wheel deceleration or acceleration signal and said reference signal; g. generating a control signal by comparing said first and second comparison signals for controlling the brake pressure; and h. varying said brake pressure in a continuous manner in accordance with said control signal.
Claim 3
Dependent Claim
56 words
The method as set forth in claim 1, wherein said reference signal is obtained by modifying said pseudo vehicle speed signal to a value which corresponds to the wheel speed signal representing the maximum coefficient of adhesion in relation to the vehicle speed and wherein said first comparison signal is equal to said wheel speed signal.
Claim 4
Dependent Claim
52 words
The method as set forth in claim 1 wherein said reference signal is equal to said wheel speed signal divided by said pseudo vehicle speed signal at the maximum coefficient of adhesion and wherein said first comparison signal is equal to said wheel speed signal divided by said pseudo vehicle speed signal.
Claim 5
Independent Claim
224 words
An apparatus for pressure control of an antiskid brake system for a wheeled vehicle said apparatus comprising: a. first circuit means for sensing the speed of a wheel and for generating a wheel speed signal said first circuit means including a generator for producing a speed responsive voltage; b. second circuit means, coupled to said first circuit means, for generating a wheel deceleration or acceleration signal; c. third circuit means, coupled to said first circuit means, for generating a pseudo vehicle speed signal; d. fourth circuit means, coupled to said second circuit means, for establishing a reference signal equal to the ratio of wheel speed to pseudo vehicle speed at the maximum coefficient of adhesion plus the wheel deceleration or acceleration signal; e. first comparator circuit means for comparing said reference signal to a function of said wheel speed signal to determine if a change in brake pressure is an increase or decrease; and f. second comparator circuit means, coupled to said fourth circuit means for taking the difference of the output of said fourth circuit means and said function of said wheel speed signal and for producing a control signal for controlliNg said brake pressure in a continuous manner, wherein the control signal causes an increase or decrease in the brake pressure in accordance with the output of said first comparator circuit means.
Claim 6
Independent Claim
224 words
An apparatus for pressure control of an antiskid brake system for a wheeled vehicle said apparatus comprising: a. first circuit means for sensing the speed of a wheel and for generating a wheel speed signal said first circuit means including a generator for producing a speed responsive voltage; b. second circuit means, coupled to said first circuit means, for generating a wheel deceleration or acceleration signal; c. third circuit means, coupled to said first circuit means, for generating a pseudo vehicle speed signal; d. fourth circuit means, coupled to said second circuit means, for establishing a reference signal equal to the ratio of wheel speed to pseudo vehicle speed at the maximum coefficient of adhesion plus the wheel deceleration or acceleration signal; e. first comparator circuit means for comparing said reference signal to a function of said wheel speed signal to determine if a change in brake pressure is an increase or decrease; and f. second comparator circuit means, coupled to said fourth circuit means for taking the difference of the output of said fourth circuit means and said function of said wheel speed signal and for producing a control signal for controlliNg said brake pressure in a continuous manner, wherein the control signal causes an increase or decrease in the brake pressure in accordance with the output of said first comparator circuit means.
Claim 7
Dependent Claim
71 words
The apparatus as set forth in claim 4 wherein said fourth circuit means includes a voltage divider for setting the ratio of the wheel speed to pseudo vehicle speed at the maximum coefficient of adhesion and for dividing said pseudo vehicle speed signal into a value corresponding to the wheel speed representing the maximum coefficient of adhesion and wherein said function of said wheel speed signal is said wheel speed signal.
Claim 8
Dependent Claim
72 words
The apparatus as set forth in claim 5 wherein said voltage divider is set at a ratio of 8/10 and wherein said first comparator circuit means causes a decrease in the brake pressure when the output of said fourth circuit means is greater than said wheel speed signal and said control signal increases in magnitude as the difference between the output of said fourth circuit means and said wheel speed signal increases.
Claim 9
Dependent Claim
62 words
The apparatus as set forth in claim 4, wherein said fourth circuit means includes an eighth circuit means for determining the ratio of said wheel speed signal to said pseudo vehicle speed signal at the maximum coefficient of adhesion and wherein said function of said wheel speed signal is equal to said wheel speed signal divided by said pseudo vehicle speed signal.
Claim 10
Dependent Claim
80 words
The apparatus as set forth in claim 7, wherein said ratio is 8/10 and wherein said comparator circuit means causes a decrease in the brake pressure when the output of said fourth circuit means is greater than said wheel speed signal divided by said pseudo vehicle speed signal and wherein said control signal increases in magnitude as the difference between the output of said fourth circuit means and said wheel speed signal divided by said pseudo vehicle speed signal increases.
References Cited (Backward Citations)
US3401984A
Cited
US3467443A
Cited
US3498682A
Cited
US3433536A
Cited
US3609313A
Cited
US3545817A
Cited
US3586387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |