Height adjusting system for automotive vehicle

1. A system for adjusting a height of an automotive vehicle having four wheels consisting of a front-right wheel, a front-left wheel, a rear-right wheel, and a rear-left wheel, the system comprising:

four height adjusters provided for the four wheels respectively; and

a controller for controlling, based on each of respective target levels corresponding to four positions corresponding to the four wheels, an operation of a corresponding one of the four height adjusters so as to adjust the vehicle height at a corresponding one of the four positions corresponding to the four wheels,

the controller including:

an initial control portion which controls, based on a single adjustment request, the operation of at least one of the four height adjusters such that the vehicle height is initially changed at at least two of the four positions, in a first direction which is one of an upward direction and a downward direction, and then in a second direction which is the other of the upward and downward directions; and

a final control portion which controls, after the operation of the at least one height adjuster is controlled by the initial control portion, the respective operations of all of the four height adjusters, such that the vehicle height is changed at all of the four positions to the respective target levels.

2. The system according to claim 1 , wherein the initial control portion includes an attitude maintaining portion which controls at least one of two diagonal pairs of the height adjusters concurrently in a same manner such that the vehicle height is lowered, and then increased, at all of the four positions while an attitude of the vehicle is maintained.

3. The system according to claim 1 , wherein the initial control portion includes an attitude changing portion which controls at least one of the height adjusters such that the vehicle height is lowered, and then increased, at two of the four positions which are not in a diagonal relationship.

4. The system according to claim 1 , wherein the initial control portion includes a stationary period executing portion which implements the control of the operation of the at least one height adjuster while the vehicle is at rest.

5. The system according to claim 1 ,

wherein the vehicle further comprises four wheel-side members disposed on respective sides of the four wheels, and four body-side members disposed on a side of a body of the vehicle at respective positions corresponding to the four wheels, and

wherein each of the height adjusters includes a fluid pressure chamber disposed between a corresponding one of the wheel-side members and a corresponding one of the body-side members, and the controller includes a flow control portion which controls flow of a fluid into, and out of, each of the fluid pressure chambers.

6. The system according to claim 1 ,

wherein the vehicle further comprises four wheel-side members disposed on respective sides of the four wheels, and four body-side members disposed on a side of a body of the vehicle at respective positions corresponding to the four wheels, and

wherein each of the height adjusters includes a rotary mechanism which rotates a corresponding one of the wheel-side members around a horizontal axis with respect to a corresponding one of the body-side members.

7. A method of adjusting a height of an automotive vehicle by means of a height adjusting, system thereof while the vehicle is at rest, so that the vehicle height is lowered to a target level, the method comprising:

a first step of lowering, based on a single adjustment request, the vehicle height by a predetermined amount;

a second step of increasing, after the first step, the vehicle height; and

a third step of lowering, after the second step, the vehicle height to the target level.

8. The method according to claim 7 , wherein an attitude of the vehicle is maintained throughout the first and second steps.

9. The method according to claim 7 , wherein a body of the vehicle is inclined during at least a part of the first and second steps.