Patent ID: 8150555

Claim:
A fluid pressure control apparatus comprising: a solenoid valve to increase and decrease a fluid pressure by varying a valve opening degree; and a controller to control the fluid pressure by varying a command current for driving the solenoid valve, the controller being configured, to calculate a hysteresis correction quantity to reduce a hysteresis effect of a hysteresis characteristic of the fluid pressure outputted from the solenoid valve with respect to the command current varied in an increasing direction and a decreasing direction, and to vary the command current to control the fluid pressure to a target pressure in accordance with the hysteresis correction quantity, the controller being configured to calculate the hysteresis correction quantity in accordance with a turn-to-turn variation quantity determined from a current difference between a first command current value at a first changeover of a varying direction of the command current from one of the increasing and decreasing directions to the other and a second command current value at a second changeover of the varying direction of the command current before the first changeover.