US3737201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for generating a control signal for use in a vehicle brake system
Assignee: Aisin Corp
•
Filing: 1970-06-24
•
Granted: 1973-06-05
•
Expires: 1990-06-24
Abstract
Abstract A method and apparatus for generating and using pseudo vehicle speed signals for use with an anti-skid brake control system. A signal responsive to the rotational speed of a vehicle wheel is generated and used for producing a pseudo vehicle speed signal. A memory is used to store the pseudo vehicle-speed signal and the memory is discharged at a rate dependent upon the applied brake pressure of the brakes of the system. The value stored in the memory is compared with the wheel-rotational speed to control the anti-skid brake control system. The improvement comprises the provision of a memory and control means adapted for increasing the reduction rate of a memorized vehicle speed voltage with increase of applied brake pressure and conversely for decreasing said voltage reduction rate with decrease of applied brake pressure.
Inventors
- 👤 T Okamoto
- 👤 K Kuwana
- 👤 T Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:00
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
116 words
A method for generating a control signal for use in a vehicle brake system and method including: a. generating a wheel speed signal which is a function of the varying speed of the vehicle wheel; b. generating a pseudo vehicle speed signal which is a function of said wheel speed signal and storing said pseudo speed signal in a memory device; c. generating a brake pressure signal which is a function of the vehicle brake pressure; d. reducing the value of the stored pseudo vehicle speed signal as a function of the brake pressure signal; and e. generating said control signal as a function of the reduced pseudo vehicle speed signal and the wheel speed signal.
Claim 2
Independent Claim
116 words
A method for generating a control signal for use in a vehicle brake system and method including: a. generating a wheel speed signal which is a function of the varying speed of the vehicle wheel; b. generating a pseudo vehicle speed signal which is a function of said wheel speed signal and storing said pseudo speed signal in a memory device; c. generating a brake pressure signal which is a function of the vehicle brake pressure; d. reducing the value of the stored pseudo vehicle speed signal as a function of the brake pressure signal; and e. generating said control signal as a function of the reduced pseudo vehicle speed signal and the wheel speed signal.
Claim 3
Dependent Claim
45 words
The method as set forth in claim 1 wherein the step of generating said control signal includes a. taking the difference between said wheel speed signal and the reduced pseudo vehicle speeD signal; and b. generating a signal which is a function of said difference.
Claim 4
Dependent Claim
45 words
discharge means including a transistor coupled to said integrating means and to said pressure signal generating means for reducing the integrated value of said wheel speed signal wherein said discharging means has an equivalent resistance which varies as a function of said pressure signal; and
Claim 5
Dependent Claim
45 words
discharge means including a transistor coupled to said integrating means and to said pressure signal generating means for reducing the integrated value of said wheel speed signal wherein said discharging means has an equivalent resistance which varies as a function of said pressure signal; and
Claim 6
Dependent Claim
112 words
voltage divider means for dividing the output of said integrating circuit in response to a predetermined percentage of the speed of said vehicle; d. skid signal generating means for generating a skid signal, said skid signal generating means including a differential amplifier having one input for receiving said wheel speed signal and another input for receiving the predetermined percentage of said pseudo speed signal and for taking the difference between said two signals; e. Schmitt trigger means coupled to the output of said differential amplifier and responsive thereto; and f. means coupled to said Schmitt trigger means for generating a skid signal in response to the output of said Schmitt trigger means.
Claim 7
Dependent Claim
112 words
voltage divider means for dividing the output of said integrating circuit in response to a predetermined percentage of the speed of said vehicle; d. skid signal generating means for generating a skid signal, said skid signal generating means including a differential amplifier having one input for receiving said wheel speed signal and another input for receiving the predetermined percentage of said pseudo speed signal and for taking the difference between said two signals; e. Schmitt trigger means coupled to the output of said differential amplifier and responsive thereto; and f. means coupled to said Schmitt trigger means for generating a skid signal in response to the output of said Schmitt trigger means.
Claim 8
Independent Claim
123 words
An apparatus for generating a control signal for use in a vehicle brake system said apparatus comprising: a. first generating means for generating a wheel speed signal which is a function of the varying speed of a wheel of said vehicle; b. pressure signal means for generating a brake pressure signal which is a function of the pressure in said vehicle brake system; c. pseudo vehicle speed signal generating means for storing said wheel speed signal and for reducing the value of the stored signal as a function of said brake pressure signal; d. control signal generating means for receiving said wheel speed signal and said pseudo vehicle speed signal and for generating said control signal as a function of said received signals.
Claim 9
Independent Claim
123 words
An apparatus for generating a control signal for use in a vehicle brake system said apparatus comprising: a. first generating means for generating a wheel speed signal which is a function of the varying speed of a wheel of said vehicle; b. pressure signal means for generating a brake pressure signal which is a function of the pressure in said vehicle brake system; c. pseudo vehicle speed signal generating means for storing said wheel speed signal and for reducing the value of the stored signal as a function of said brake pressure signal; d. control signal generating means for receiving said wheel speed signal and said pseudo vehicle speed signal and for generating said control signal as a function of said received signals.
Claim 10
Dependent Claim
50 words
The apparatus as set forth in claim 3 wherein said pseudo vehicle speed signal generating means comprises: a. integrating means for integrating said wheel speed signal; and b. discharge means for discharging the accumulated value in said integrating means wherein said discharge means is responsive to said pressure signal means.
Claim 11
Dependent Claim
39 words
The apparatus as set forth in claim 4 wherein the rate at which said discharging means reduces the value accumulated in said integrating means increases with an increase in the brake pressure of the brake system of the vehicle.
Claim 12
Dependent Claim
36 words
The apparatus as set forth in claim 4 wherein said discharge means includes a semiconductor means which has an equivalent variable resistance which varies in response to variations in the brake pressure of said brake system.
Claim 13
Dependent Claim
33 words
The apparatus as set forth in claim 4 wherein said pressure signal means includes a variable resistance element which varies in response to changes in the brake pressure of the vehicle brake system.
Claim 14
Dependent Claim
36 words
The apparatus as set forth in claim 3 further including percentage means coupled to said pseudo vehicle speed signal generating means for generating a signal which is a predetermined percentage of said pseudo vehicle speed signal.
Claim 15
Dependent Claim
15 words
The apparatus as set forth in claim 8 wherein said predetermined percentage is 80 percent.
Claim 16
Dependent Claim
136 words
Apparatus for generating a pseudo vehicle speed signal for use with an antiskid control system for a brake system of a vehicle said apparatus comprising: a. means for generating a variable wheel speed signal which varies as a function of the speed of a wheel of the vehicle; b. pressure signal generating means for generating a signal which is a function of the pressure in the brake system; c. integrating means for integrating the wheel speed signal; d. discharging means for reducing the value of said integrated wheel speed signal, wherein said discharging means are responsive to said pressure signal generating means and wherein said reduced integrated wheel speed signal is said pseudo vehicle speed signal; and e. percentage means for generating a percentage signal which is a predetermined percentage of said pseudo vehicle speed signal.
Claim 17
Dependent Claim
136 words
Apparatus for generating a pseudo vehicle speed signal for use with an antiskid control system for a brake system of a vehicle said apparatus comprising: a. means for generating a variable wheel speed signal which varies as a function of the speed of a wheel of the vehicle; b. pressure signal generating means for generating a signal which is a function of the pressure in the brake system; c. integrating means for integrating the wheel speed signal; d. discharging means for reducing the value of said integrated wheel speed signal, wherein said discharging means are responsive to said pressure signal generating means and wherein said reduced integrated wheel speed signal is said pseudo vehicle speed signal; and e. percentage means for generating a percentage signal which is a predetermined percentage of said pseudo vehicle speed signal.
Claim 18
Dependent Claim
40 words
The apparatus as set forth in claim 10 further including difference sensing means for sensing the difference between said percentage signal and said wheel speed signal and for providing a skid control signal which is a function of said difference.
Claim 19
Dependent Claim
17 words
The apparatus as set forth in claim 11 wherein said difference sensing means comprises a differential amplifier.
Claim 20
Dependent Claim
88 words
Apparatus for anti-skid control of a vehicle brake system said braking system being fitted with a brake pressure reducing means so as to reduce the braking force in response to a skid signal, said apparatus comprising: a. means for generating a variable wheel speed signal which is a function of the speed of a wheel of the vehicle; b. pressure signal generating means for generating a signal which is a function of the pressure in the brake system; c. means for generating a pseudo vehicle speed signal comprising:
Claim 21
Dependent Claim
88 words
Apparatus for anti-skid control of a vehicle brake system said braking system being fitted with a brake pressure reducing means so as to reduce the braking force in response to a skid signal, said apparatus comprising: a. means for generating a variable wheel speed signal which is a function of the speed of a wheel of the vehicle; b. pressure signal generating means for generating a signal which is a function of the pressure in the brake system; c. means for generating a pseudo vehicle speed signal comprising:
References Cited (Backward Citations)
US3245213A
Cited
US3275384A
Cited
US3503654A
Cited
US3467443A
Cited
US3498682A
Cited
US3433536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |