Patent ID: 10458398

Abstract:
A method of setting a zero point according to one embodiment of the present disclosure relates to a method of setting a zero point of a bi-directional linear pump for an active suspension apparatus supplying fluid to an actuator connected to a coil spring coupled to a wheel of a vehicle, which includes controlling at least one of a first valve disposed between the actuator and the pump and a second valve disposed between the pump and a fluid reservoir by means of an electronic control unit (ECU) in a first Operation, moving a piston disposed inside the pump to one side to move the piston up to a MAX Stroke position of the one side in a second Operation, calculating an approximate MIN Stroke position of the other side of the piston based on the MAX Stroke position of the one end thereof in a third Operation, moving the piston to the other side to move the piston up to a MIN Stroke position in a fourth Operation, comparing the approximate MIN Stroke position of the other side with the MIN Stroke position thereof in a fifth Operation, and determining whether or not the pump is normal in a sixth Operation based on the comparison result.