Composite Material Spring for Suspension Device of Vehicle, and Method for Controlling Driving of Vehicle Using the Same

A method for controlling driving of a vehicle using a composite material spring for a suspension device of the vehicle, the method comprising:

• determining a longitudinal inclination angle of the vehicle according to a rear load of the vehicle as being greater than or equal to a reference inclination angle;
• and
• controlling a stiffness of the composite material spring installed in a rear wheel of the vehicle to be larger than a stiffness of a composite material spring installed in a front wheel of the vehicle,
• wherein the composite material spring comprises:
• a leaf spring installed in each of a body of the vehicle and wheels of the vehicle, including the front wheel and the rear wheel of the vehicle;
• a first fluid container installed at a left side of a center of the leaf spring and including a first magnetorheological fluid having a stiffness adjusted according to an amount of output current of a controller;
• and
• a second fluid container installed at a right side of the center of the leaf spring and including a second magnetorheological fluid having a stiffness adjusted according to the amount of output current of the controller.

A method for controlling driving of a vehicle using a composite material spring for a suspension device of the vehicle that includes a composite material spring in each of a body of the vehicle and wheels of the vehicle, wherein each of the composite material springs comprises a leaf spring, a first fluid container installed at a left side of the leaf spring and including a first magnetorheological fluid having a stiffness adjusted according to an amount of output current of a controller, and a second fluid container installed at a right side of the leaf spring and including a second magnetorheological fluid having a stiffness adjusted according to the amount of output current of the controller, the method comprising:

• determining whether a longitudinal inclination angle of the vehicle according to a rear load of the vehicle is greater than, equal to, or less than a reference inclination angle;
• and
• controlling a stiffness of the composite material spring installed in ones of the wheels of the vehicle based on whether the longitudinal inclination angle of the vehicle according to the rear load of the vehicle is greater than, equal to, or less than the reference inclination angle;
• wherein controlling the stiffness of the composite material spring comprises controlling the stiffness of the composite material spring installed in a rear wheel of the vehicle to be larger than a stiffness of a composite material spring installed in a front wheel of the vehicle when the longitudinal inclination angle of the vehicle is greater than or equal to the reference inclination angle;
• and
• wherein controlling the stiffness of the composite material spring comprises controlling the stiffness of the composite material springs installed in each of the wheels of the vehicle with a first reference value when the longitudinal inclination angle of the vehicle is less than the reference inclination angle.