Patent ID: 6478386
Filing Date: 2002-11-12
Classification: B60T

Abstract:
A control device for an antilock brake system comprising:an input hydraulic chamber in communication with a master cylinder; an output hydraulic chamber in communication with a caliper cylinder of a brake; a cut valve in communication with said input hydraulic chamber and said output hydraulic chamber for performing a cutoff operation; an expander piston controlling a position of said cut valve, said expander piston having a cut valve opening position and a cut valve closing position, said expander piston closing said cut valve by increasing a volume of said output hydraulic chamber in said cut valve closing position; a crank mechanism for displacing said expander piston between said cut valve opening position and said cut valve closing position, said crank mechanism including an actual crank angle; a crank mechanism operating angular range including said actual crank angle, said crank mechanism operating angular range corresponding to any expander piston position between said cut valve opening position and said cut valve opening position, and including said cut valve opening position and said cut valve closing position; a servomotor for controlling said actual crank angle of said crank mechanism according to a target angle, said target angle only being within said crank mechanism operating angular range; and a stopper member for setting a turning limit of said crank mechanism, said turning limit preventing said crank mechanism from turning in excess of a predetermined maximum actual crank angle corresponding to said cut valve opening position, said target angle being set at said predetermined maximum actual crank angle during an ABS non-operational state, and said expander piston being retracted to said cut valve closing position during an ABS operational state.