Patent ID: 8909441

Claim:
A driving power source rotational speed control device, provided in a vehicle that outputs power of a rotary driving power source via a continuously variable transmission as driving power for traveling, that changes a rotational speed of the rotary driving power source in association with changes in vehicle speed when acceleration is requested, the driving power source rotational speed control device comprising: an acceleration/deceleration state determination portion that determines whether the vehicle is accelerating or decelerating when acceleration is requested; and a controller configured to: set a change gradient of the rotary driving power source rotational speed to establish the association of the rotary driving power source rotational speed with changes in the vehicle speed when acceleration is requested, the change gradient of the rotary driving power source rotational speed presenting an amount of changes of the rotary driving power source rotational speed when the vehicle speed changes while the acceleration is requested, such that the association of the rotary driving power source rotational speed with changes in the vehicle speed is reduced when the acceleration/deceleration state determination portion determines that the vehicle is decelerating compared to a case where it is determined that the vehicle is accelerating, by suppressing reductions in the rotational speed of the rotary driving power source when the acceleration/deceleration state determination portion determines that the vehicle is decelerating while the acceleration is requested, wherein in establishing the association of the rotary driving power source rotational speed with changes in the vehicle speed when acceleration is requested by setting the change gradient of the rotary driving power source rotational speed relative to changes in the vehicle speed, the controller sets an absolute value of the change gradient to be smaller when the acceleration/deceleration state determination portion determines that the vehicle is decelerating than when the acceleration/deceleration state determination portion determines that the vehicle is accelerating.