Patent ID: 9562546
Date: 2017-02-07
CPC Classifications: B60Y,F15B,F16H

Claim:
1. A hydraulic control circuit comprising: a solenoid valve, whose responsiveness of a change in an actual pressure with respect to a change in an instructional pressure deteriorates when the instructional pressure enters a dead band region that is on a lower pressure side than a dead band threshold, for adjusting a hydraulic pressure supplied to a hydraulic device operated by the hydraulic pressure based on the instructional pressure; and a controller configured to give an instruction of the instructional pressure to the solenoid valve, wherein, when the instructional pressure is set in the dead band region and the instructional pressure increases within the dead band region to such an extent that a speed ratio does not change, the controller increases the instructional pressure in a stepwise manner to a charge pressure that is higher than the dead band threshold, thereafter sets a lower limit of the instructional pressure to be the dead band threshold, and prohibits use of the dead band region for a certain period of time.