초록 ▼

A brake control system has a controller (52, 53, 54) including hysteresis. To prevent over-shoot of control operation if a comparison between actual braking pressure (Pact) and commanded pressure (Pcom) is applied to control valves which, for example, operate pneumatically, so that the brakes will n

A brake control system has a controller (52, 53, 54) including hysteresis. To prevent over-shoot of control operation if a comparison between actual braking pressure (Pact) and commanded pressure (Pcom) is applied to control valves which, for example, operate pneumatically, so that the brakes will not instantaneously respond, a difference pressure threshold (DG) is determined and, when the difference pressure level is passed by the difference pressure signal, the valves are controlled to operate in pulse operation, in which each pressure pulse (TE) is followed by a quieting or pressure-OFF time (TBER). The pulse sequence and the timing of pulses and pulse gaps is controllable in accordance with pressure levels, operating parameters, pressure difference levels and the like.

대표청구항 ▼

Braking system for a vehicle, in which the vehicle has a vehicle brake means, responsive to the pressure of a brake fluid for braking the vehicle; a brake control means providing an electrical brake command signal representative of a desired value of a parameter of the vehicle; transducer means prov

Braking system for a vehicle, in which the vehicle has a vehicle brake means, responsive to the pressure of a brake fluid for braking the vehicle; a brake control means providing an electrical brake command signal representative of a desired value of a parameter of the vehicle; transducer means providing an actual signal (Pact) representative of the actual value of said parameter; controlled valve means controlling, selectively, admission, drainage or holding of pressurized brake fluid; a controller receiving said command signal and said actual signal forming an output difference signal dependent on the difference between the command and actual signal, and providing output control signals (y) to control said controlled valve means, said controller having valve control switching thresholds at which the controller changes its output signal, comprising means for determining if the difference (DDG) representative of a predetermined parameter difference; and means for controlling said controlled valve means, selectively in dependent on the determined difference (DDG) (1) for continued admission or drainage of brake fluid to or from said controlled valve mean if the absolute value of the difference (DDG); and (2) for controlling said controlled valve means for admission, or drainage, respectively, of brake fluid to or from said controlled valve means in pulses, followed by pulse pauses during which brake fluid is not admitted to, or drained from said valve means, if the absolute value of the difference (DDG).