| 摘要 |
A decision is made as to whether a vehicle is traveling in an uphill traveling mode or in a downhill traveling mode with reference to an incremental running resistance DELTAR determined on the basis of a running resistance that will act on the vehicle while the vehicle is traveling in a flat road traveling mode. A desired traction Fd for a full-open throttle state in which a throttle valve is fully open is set if the vehicle is in the uphill traveling mode by using the incremental running resistance DELTAR, and a desired traction Fd for a full-closed throttle state in which the throttle valve is fully closed is set if the vehicle is in the downhill traveling mode by using the incremental running resistance DELTAR. The desired traction Fd and an achieved traction F(t) in the full-open throttle state at a present traveling speed V are compared if the vehicle is in the uphill traveling mode. The desired traction Fd and an achieved traction F(t) in the full-closed throttle state at a present traveling speed V are compared if the vehicle is in the downhill traveling mode. A speed change ratio correction DELTAr is set to adjust the achieved traction F(t) to the desired traction Fd. Data on desired primary pulley speed NP stored in a basic speed change characteristic map is shifted by the speed change ratio correction DELTAr toward a downshift side for correction, and a desired speed change ratio is is set on the basis of the corrected data on desired primary pulley speed NP.
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