Patent ID: 8202186
Filing Date: 2012-06-19
Classification: F16H

Abstract:
1. A hydraulic control apparatus for an automatic transmission that includes a planetary gear set and a plurality of friction elements and establishes a plurality of speeds by changeover of the plurality of friction elements between engagement and release, the plurality of friction elements including a first friction element that is brought into a release state upon first shift, a second friction element that is in a release state upon the first shift but is brought into an engagement state upon second shift, and a third friction element that is brought into a release state upon the second shift, the hydraulic control apparatus comprising: a pressure regulator valve regulating a hydraulic fluid pressure that is supplied to the second friction element; a selector valve that is switchable between a first position where fluid communication between the pressure regulator valve and the second friction element is allowed, and a second position where the fluid communication between the pressure regulator valve and the second friction element is blocked; a switch means for switching the selector valve to the second position when the first friction element is in the engagement state, and switching the selector valve to the first position when the first friction element is in the release state; and a sequential shift control means for performing sequential shift control in a case where it is necessary to execute the second shift during execution of the first shift, the sequential shift control including: