| 摘要 |
Load fluctuation operating section calculates fluctuant quantities of each of a total load value and a partial load value respectively calculated by a load operating section based on the sensed load value, and determines whether or not the total load fluctuating quantity and the partial load fluctuating quantity are on the increase or on the decrease to obtain a total load fluctuating direction and a partial load fluctuating direction. An occupant-type changeover permitting signal indicative of permission of the occupant-type changeover is output only when the total load fluctuating quantity is more than the previously defined first threshold, the partial load fluctuating quantity is more than another threshold differing from the first threshold, and the total load fluctuating direction and the partial load fluctuating direction show the same fluctuation tendency.
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