Patent ID: 7895912

Claim:
A power transmission controlling apparatus for controlling a power transmission mechanism to change a drive power inputted therein and output said changed drive power in any one of a high speed output state to output said drive power at a high speed, and a low speed output state to output said drive power at a low speed output state, said power transmission controlling apparatus, comprising: changing command means for outputting a changing command to change one of said high speed output state and said low speed output state into the other of said high speed output state and said low speed output state; changing means for performing a changing operation to change one of said high speed output state and said low speed output state into the other of said high speed output state and said low speed output state with said changing command outputted by said changing command means; first judging means for judging whether or not said changing operation of said changing means is under an allowable changing condition preliminarily set based on the operation states of said power transmission mechanism in the time period from a starting time to a releasing time, said starting time being indicative of having said power transmission mechanism start said changing operation, and said releasing time being indicative of having said power transmission mechanism released from said high speed output state and said low speed output state; and returning means for returning said power transmission mechanism to its starting state held at the starting time when said first judging means judges in the time period that said changing operation of said changing means is brought out of said allowable changing condition after said changing means starts said changing operation.