Patent ID: 8544354
Filing Date: 2013-10-01
Classification: F16H,Y10T

Abstract:
1. A controller for a vehicle automatic transmission, which engages or disengages plural hydraulic engagement elements in a rotational state to switch plural gear positions, defined based on traveling conditions of the vehicle, automatically according to predetermined gear shifting maps, the controller comprising: monitoring means for monitoring working hydraulic pressure of hydraulic engagement elements for a high gear range to effect a high gear position among the gear positions; and characteristic changing means for changing a gear shifting characteristic along a vehicle speed scale in an increasing direction, wherein the gear shifting characteristic is for shifting from a middle gear position to a low gear position along a gear shifting map, and wherein the changing of the gear shifting characteristic along the map occurs when the hydraulic engagement elements for the high gear range are disengaged along with a shift from the high gear position to the middle gear position, and when the working hydraulic pressure monitored by the monitoring means has become zero or less than a positive threshold.