Claims
- 1. An adaptive brake application and initial skid detection system for braking of a wheel of a vehicle, comprising:a wheel brake for braking the wheel; a brake torque sensor for generating brake torque signals that are a function of the brake torque applied to the wheel; means for comparing said brake torque signals with a predetermined threshold brake torque; wheel speed signal generating means for producing wheel speed signals that are a function of the rotational speed of the wheel; a wheel velocity converter for generating a wheel velocity signal based upon said wheel speed signals; velocity reference generating means for generating a reference velocity signal; wheel velocity comparison means for comparing said wheel velocity signal with said reference velocity signal for generating wheel velocity error signals indicative of the difference between said aircraft wheel velocity signals and said reference velocity signal; a torque bias modulator integrator responsive to said wheel velocity signals for adjusting said wheel velocity error signals to provide an anti-skid control signal; command brake torque signal generating means for generating a command brake torque signal in response to a deceleration command; brake torque comparison means for comparing said brake torque signals with said command brake torque signal for generating brake torque difference signals indicative of the difference between said brake torque signals and said command brake torque signal; and control means for providing an adjusted brake torque signal to said wheel brake to control said wheel brake independently of operator brake application, in response to said brake torque difference signals.
- 2. An adaptive brake application and initial skid detection system for braking of a wheel of a vehicle, comprising:a wheel brake for braking the wheel; a brake torque sensor for generating brake torque signals that are a function of the brake torque applied to the wheel; means for comparing said brake torque signals with a predetermined threshold brake torque; wheel speed signal generating means for producing wheel speed signals that are a function of the rotational speed of the wheel; a wheel velocity converter for generating a wheel velocity signal based upon said wheel speed signals; velocity reference generating means for generating a reference velocity signal; wheel velocity comparison means for comparing said wheel velocity signal with said reference velocity signal for generating wheel velocity error signals indicative of the difference between said aircraft wheel velocity signals and said reference velocity signal; a torque bias modulator integrator responsive to said wheel velocity signals for adjusting said wheel velocity error signals to provide an anti-skid control signal; command brake torque signal generating means for generating a command brake torque signal in response to a deceleration command; brake torque comparison means for comparing said brake torque signals with said command brake torque signal for generating brake torque difference signals indicative of the difference between said brake torque signals and said command brake torque signal; control means for providing an adjusted brake torque signal to said wheel brake to control said wheel brake independently of operator brake application, in response to said brake torque difference signals; and means for initializing the torque bias modulator integrator with a predetermined threshold brake torque plus a predetermined constant torque value, to thereby minimize delay of said torque bias modulator integrator in controlling a maximum allowable brake torque.
- 3. The adaptive brake application and initial skid detection system of claim 2, further comprising means for initializing the torque bias modulator integrator to the value of a measured brake torque when the wheel velocity error signal becomes greater than a velocity error threshold.
RELATED APPLICATIONS
This is a continuation-in-part of Ser. No. 10/027,820, filed Dec. 21, 2001, which is a continuation of Ser. No. 09/887,581, filed Jun. 21, 2001 now U.S. Pat. No. 6,345,872, which is a divisional of Ser. No. 09/591,093, filed Jun. 8, 2000, now U.S. Pat. No. 6,299,262, which is a continuation of Ser. No. 08/850,680, filed May 2, 1997, now U.S. Pat. No. 6,132,016.
US Referenced Citations (39)
Foreign Referenced Citations (12)
Number |
Date |
Country |
20 40 074 |
Aug 1971 |
DE |
42 43 245 |
Jun 1994 |
DE |
231829 |
Aug 1987 |
EP |
378810 |
Jul 1990 |
EP |
386939 |
Sep 1990 |
EP |
426959 |
May 1991 |
EP |
445575 |
Sep 1991 |
EP |
575936 A1 |
Dec 1993 |
EP |
0 601 681 |
Jun 1994 |
EP |
2637231 |
Apr 1990 |
FR |
1 319 268 |
Jun 1973 |
GB |
2292195 |
Feb 1996 |
GB |
Non-Patent Literature Citations (2)
Entry |
US RE30,763, 10/1981, Hirzel et al. (withdrawn) |
Motohiro Igarashi, et al. Digital Brake Control System for Mag-lev Trains, presented at STech '93 (International Conference on Speedup Technology for Railway and MAGLEV Vehicles), Nov. 1993, Yokohama, Japan. |
Continuations (2)
|
Number |
Date |
Country |
Parent |
09/887581 |
Jun 2001 |
US |
Child |
10/027820 |
|
US |
Parent |
08/850680 |
May 1997 |
US |
Child |
09/591093 |
|
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
10/027820 |
Dec 2001 |
US |
Child |
10/225092 |
|
US |