Combined antiskid and load-dependent brake control system for a motor vehicle

An antiskid brake control system for motor vehicles comprising:

• (a) a reservoir in which fluid under pressure is stored;
• (b) a brake cylinder device for each wheel of the vehicle;
• (c) an operator controlled brake valve device via which the fluid pressure from said reservoir is supplied to said brake cylinder devices in accordance with the degree of braking desired;
• (d) valve means interposed between said brake valve device and said brake cylinder devices for influencing braking pressure independently of said brake valve device;
• (e) antiskid control means for effecting operation of said valve means during wheel skid conditions;
• (f) sensor means for providing output signals corresponding to the brake valve regulated supply fluid pressure, the effective brake cylinder pressure and the load supported by the respective axles of the vehicle;
• and
• (g) load control means subject to the sensor output signals for effecting operation of said valve means to influence the fluid pressure of said brake cylinder device of a chosen one of the respective vehicle axles so as to follow a predetermined brake cylinder pressure buildup curve that deviates from a normal buildup curve at a predetermined point thereon corresponding to the time when the brake valve supply pressure signal exceeds the signal of the load supported by the chosen axle.