Patent ID: 8831843

Claim:
A hydraulic pressure controller for controlling output pressure of a solenoid valve in an oil-hydraulic circuit of a transmission of a vehicle, the hydraulic pressure controller comprising: a target value acquiring section configured to acquire a target exciting current which is a target value for an exciting current of the solenoid valve; an actual value acquiring section configured to acquire an actual exciting current which is an actual measured value of the exciting current of the solenoid valve; an operation value setting section configured to set a duty cycle of an operation signal based on the target exciting current and the actual exciting current, the operation signal being inputted to a driver circuit for driving the solenoid valve; and a correction section configured to correct at least one of the duty cycle, the target exciting current, and the actual exciting current by using a filter for eliminating or damping a resonant frequency component of a vibration model of the output pressure of the solenoid valve, wherein the correction section includes a first converter, a filter section, and a second converter, the first converter converts the duty cycle to a suitable hydraulic pressure, which is the form suitable for a filtering process in the filter section, by using a relationship between the duty cycle and a steady-state output pressure of the solenoid valve, the filter section outputs a corrected hydraulic pressure by performing the filtering process on the suitable hydraulic pressure, and the second converter converts the corrected hydraulic pressure to a corrected duty cycle by using the relationship.