| 摘要 |
In a four wheel drive system for an automotive vehicle, a detected value DELTA VW of difference of rotating speed between the front and rear wheels is compared with a threshold DELTA VW0 determined in accordance with a pseudo vehicle speed VFF (S16, S213). As a result of this, when a determination is made that the pseudo vehicle speed VFF is in a directly connecting four wheel drive condition inhibiting range, a directly connecting four wheel drive condition inhibiting signal 8N is sent out (S121), so that a front wheel side torque distribution instruction value T2 is determined as a value preventing the directly connecting four wheel drive condition. Thereby, in a case where different diameter wheels are used, a deterioration of stability and an increase of load of power train system caused by the directly connecting four wheel drive condition can be prevented.
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