Suspension apparatus and recording medium

1. A suspension apparatus comprising:

a damping device which damps a force in an extension-direction where a relative displacement between a vehicle body and a wheel increases, and damps a force in a compression-direction where the relative displacement decreases;

an operating section which is operated in order to set an extension adjustment value for adjusting an extension damping force when a change velocity of the relative displacement is positive, a compression adjustment value for adjusting a compression damping force when the change velocity is negative, and a zero adjustment value for adjusting a zero damping force when the change velocity is zero; and

a determination section which determines a target value of the extension damping force, a target value of the compression damping force and a target value of the zero damping force; wherein:

the determination section:

determines the target value of the extension damping force by using; (i) a base damping force and the extension adjustment value, or (ii) the base damping force, the extension adjustment value and the zero adjustment value, said base damping force being determined based on the change velocity,

determines the target value of the compression damping force by using; (i) the base damping force, the compression adjustment value and the zero adjustment value, or (ii) the base damping force and the compression adjustment value, and

determines the target value of the zero damping force by using the base damping force and the zero adjustment value to determine the target value of the zero damping force.

2. The suspension apparatus according to claim 1 , wherein:

to determining the target value of the extension damping force, the determination section uses the base damping force and the extension adjustment value when the change velocity is equal to or higher than an extension predetermined velocity which is set in advance, and uses the base damping force, the extension adjustment value and the zero adjustment value when the change velocity is lower than the extension predetermined velocity.

3. The suspension apparatus according to claim 2 , wherein:

to determine the target value of the compression damping force, the determination section uses the base damping force and the compression adjustment value when the change velocity is equal to or lower than a compression predetermined velocity which is set in advance, and uses the base damping force, the compression adjustment value and the zero adjustment value when the change velocity is higher than the compression predetermined speed.

4. The suspension apparatus according to claim 1 , wherein:

to determine the target value of the compression damping force, the determination section uses the base damping force and the compression adjustment value when the change velocity is equal to or lower than a compression predetermined velocity which is set in advance, and uses the base damping force, the compression adjustment value and the zero adjustment value when the change velocity is higher than the compression predetermined speed.

5. A suspension apparatus comprising:

a damping device which damps a force in an extension-direction where a relative displacement between a vehicle body and a wheel increases, and damps a force in a compression-direction where the relative displacement decreases;

an operating section which is operated in order to set an extension adjustment value for adjusting an extension damping force when a change velocity of the relative displacement is positive, and a compression adjustment value for adjusting a compression damping force when the change velocity is negative;

a first determination section which determines a target value of the extension damping force and a target value of the compression damping force; and

a second determination section which determines a target value of a zero damping force when the change velocity is zero; wherein:

in a case where an adjustment direction of the extension adjustment value and an adjustment direction of the compression adjustment value are the same, the first determination section:

determines the target value of the extension damping force by use of a base damping force and the extension adjustment value when the change velocity is equal to or higher than an extension predetermined velocity which is set in advance, said base damping force being determined based on the change velocity, and determines the target value of the extension damping force by use of the base damping force, the extension adjustment value and the compression adjustment value when the change velocity is lower than the extension predetermined velocity, and

determines the target value of the compression damping force by use of the base damping force and the compression adjustment value when the change velocity is equal to or lower than a compression predetermined velocity which is set in advance, and determines the target value of the compression damping force by use of the base damping force, the extension adjustment value and the compression adjustment value when the change velocity is higher than the compression predetermined velocity; and

the second determination section uses the base damping force, the extension adjustment value and the compression occasion adjustment value to determine the target value of the zero damping force.

6. The suspension apparatus according to claim 5 , wherein:

the second determination section determines the target value of the zero damping force by use of the base damping force, the extension adjustment value and the compression adjustment value in the case where the adjustment direction of the extension adjustment value and the adjustment direction of the compression adjustment value are the same.