Patent ID: 7784883

Claim:
A vehicular brake hydraulic pressure controller, which calculates one of upstream hydraulic pressure and a downstream hydraulic pressure of a fluid circuit based on the other hydraulic pressure, the upstream and downstream being defined by a linear solenoid valve provided on the fluid circuit, the hydraulic pressure controller comprising: a reference hydraulic pressure acquisition section that acquires the other hydraulic pressure as reference hydraulic pressure; a differential pressure calculation section that calculates a differential pressure between the upstream hydraulic pressure and the downstream hydraulic pressure, by subtracting a previously-estimated one hydraulic pressure from the acquired reference hydraulic pressure; a pressure gradient coefficient calculation section that calculates a pressure gradient coefficient correlating with a drive current of the linear solenoid valve and the calculated differential pressure; and an estimated hydraulic pressure calculation section that estimates the current one hydraulic pressure by adding, to the previously-estimated one hydraulic pressure, a product which has been obtained by multiplying the calculated differential pressure by the calculated pressure gradient coefficient.