| 摘要 |
PROBLEM TO BE SOLVED: To switch the driving state of a vehicle appropinately according to the stuck state of the vehicle by putting a differential gear in a direct-coupled state when at least one of front wheels and rear wheels to which driving force is transmitted is put in a slipping state. SOLUTION: In case of judging direct-coupled four-wheel drive entry conditions, vehicle speed V is compared with the specified value V4 (S172), the absolute value|ΔVc|of propeller shaft rotation difference is compared with the specified valueΔVc3 (S174), and travel load resistance fv is compared with the specified value fv3 (S178). In case the vehicle speed V is the specified value V5 or less and select high rotating speed differenceΔVt is larger than the specified valueΔVt1 , a stuck state is judged (S182). The stuck state of a vehicle such as a one-wheel stuck state or a diagonal stuck state, and a slipping state of either one of wheels can therefore be detected appropriately. In case of the vehicle being in the stuck state, a driving mode command is switched from a full time four-wheel drive mode to a direct-coupled four-wheel drive mode to obtain excellent driving performance.
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