GEAR SHIFT CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To provide a gear shift control device for automatic transmission capable of effectively reducing a shock to be generated in an inertia phase conclusion region without requiring many man hours for development and man hours for accommodation in an inertia phase generated in a lock change gear shift.

SOLUTION: This gear shift control device for automatic transmission has a shift control means (Fig.4) for shifting to other gear stage by releasing a first frictional engagement element and fastening a second frictional engage element: and an inertia phase control means (Fig.5) for temporarily reducing a command hydraulic pressure P to the second frictional engagement element when a gear ratio to be detected during the gear shift to other gear stage has reached a set gear ratio representing an inertia phase finish immediate prior region at a time of an inertia phase generated in a replacement gear shift. The inertia phase control means (Fig.5) has a finish pressure control section (a step S62 to a step S68) for setting the reduction quantity of the command hydraulic pressure P per a predetermined time based on a gear ratio GR to be detected per a predetermined time in the inertia phase finish immediate prior region to progressively reduce the command hydraulic pressure P.

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