Patent ID: 8226528

Claim:
A shift controller for an automatic transmission mechanism that includes an automatic transmission mechanism for shift transmission of power generated by an engine, a mechanical hydraulic pump that is driven by the engine and generates a relatively low hydraulic pressure, and an accumulator that communicates with the mechanical hydraulic pump and accumulates at least a portion of the hydraulic pressure generated by the mechanical hydraulic pump, the shift controller for the automatic transmission mechanism being configured to perform a control that changes a revolution speed of the engine by controlling a gear ratio of the automatic transmission mechanism, the shift controller for the automatic transmission mechanism, comprising: a driven state determination portion that determines whether the engine is in a driven state in which the engine is driven by a travel inertia force; an accumulated pressure amount detection portion that detects whether an accumulated pressure amount of the accumulator is equal to or lower than a predetermined value; an accumulated pressure execution portion that increases the hydraulic pressure generated by the mechanical hydraulic pump and that causes the accumulator to accumulate at least a portion of the hydraulic pressure generated by the mechanical hydraulic pump when the engine is determined by the driven state determination portion to be in the driven state and the accumulated pressure amount of the accumulator is detected by the accumulated pressure amount detection portion to be equal to or lower than the predetermined value; and an upshifting execution portion that reduces a brake force, which is generated when at least a portion of the hydraulic pressure generated by the mechanical hydraulic pump is accumulated in the accumulator, by conducting upshifting that relatively decreases the gear ratio of the automatic transmission mechanism.