Vehicle suspension system for vehicle height adjustment and control method therefor

A vehicle suspension system for vehicle height adjustment, comprising:

• a damper for adjusting a height of a vehicle with neutral pressure by driving a piston up and down in a space inside a damping cylinder in which fluid is accommodated to a pressurization region in a pressurization direction and a restoration region in a restoration direction;
• an actuator, connected to a flow path of the damper, for adjusting the neutral pressure of the damper by driving a motor pump to move fluid in a hydraulic cylinder;
• a two-way control valve that operates on and off to allow and block movement of the fluid in the damping cylinder and the fluid in the hydraulic cylinder in both directions;
• a first solenoid valve provided on a flow path formed between the restoration region of the damper and the actuator;
• a reservoir for regulating gas pressure in the damping cylinder;
• and
• a control unit that controls a pressure of the motor pump of the actuator in response to a required neutral pressure of the damper, controls on/off of the two-way control valve, and controls the gas pressure of the reservoir;
• wherein the reservoir adjusts the vehicle height by regulation the gas pressure after the movement of the fluid through the two-way control valve,
• wherein the reservoir increases the gas pressure in the damping cylinder, causing a rod to rise and increase the vehicle height, or decreases the gas pressure in the damping cylinder, causing the rod to descend and decrease the vehicle height.

A control method of a vehicle suspension system for vehicle height adjustment, the method comprising:

• calculating a required neutral pressure of a damper corresponding to a vehicle height adjustment input from an outside in a control unit;
• switching a two-way control valve to an on state in the control unit;
• performing a drive of a motor pump of an actuator in response to the calculated required neutral pressure of the damper in the control unit;
• regulating a gas pressure in a damping cylinder in response to the calculated required neutral pressure of the damper in a reservoir;
• and
• switching the two-way control valve to an off state in the control unit;
• wherein in the regulating a gas pressure in a damping cylinder in response to the calculated required neutral pressure of the damper in a reservoir, the reservoir adjusts the vehicle height by regulating the gas pressure after the movement of the fluid through the two-way control valve;
• wherein the reservoir increases the gas pressure in the damping cylinder, causing a rod to rise and increase the vehicle height, or decreases the gas pressure in the damping cylinder, causing the rod to descend and decrease the vehicle height.