ANTI-LOCK BRAKING SYSTEM MODULE FOR AIRCRAFT EQUIPPED WITH MASTER CYLINDER BRAKE SYSTEMS

摘要

A combination brake and anti-lock system (11)for a wheeled vehicle such as an aircraft includes an operator controlled source of pressurized hydraulic fluid (31,37)for selectively applying hydraulic pressure to a hydraulically actuated wheel rotation braking device(25) which responds to the applied hydraulic pressure to apply a braking force to a wheel (23)of the vehicle to thereby arresting wheel motion. There is a low pressure hydraulic fluid return(91,93,97) with a normally open hold valve (83,85)in circuit between the source and the braking device for selectively opening and closing a fluid flow path from the source to the braking device and a normally closed decay valve (87,89)in circuit between the braking device and the return for selectively opening and closing a fluid flow path from the braking device to the return. A wheel speed sensing device (27)provides an indication of the rotational speed of the wheel and a valve control(99) responds to an indication of a skid indicative wheel speed irregularity from the sensing device to close the normally open valve and open the normally closed valve. The valve control(99) may be disabled manually by an operator on command or automatically upon detecting an anti-skid malfunction.