Four wheel drive system for automotive vehicle

Details Four wheel drive system for automotive vehicle Four wheel drive system for automotive vehicle

1998-04-23

2000-06-06

Boehler, Anne Marie

Motor vehicles

Having four wheels driven

With differential means for driving two wheel sets at...

180249, 701 69, B60K 1735

Patent

active

060706856

ABSTRACT:
In a four wheel drive system for an automotive vehicle, a detected value .DELTA.V.sub.W of difference of rotating speed between the front and rear wheels is compared with a threshold .DELTA.V.sub.W0 determined in accordance with a pseudo vehicle speed V.sub.FF (S116, S213). As a result of this, when a determination is made that the pseudo vehicle speed V.sub.FF is in a directly connecting four wheel drive condition inhibiting range, a directly connecting four wheel drive condition inhibiting signal S.sub.N is sent out (S121), so that a front wheel side torque distribution instruction value T.sub.2 is determined as a value preventing the directly connecting four wheel drive condition. Thereby, in case of using of the different diameter wheel, 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.

REFERENCES:
patent: 5005663 (1991-04-01), Niide et al.
patent: 5299131 (1994-03-01), Haas et al.
patent: 5323871 (1994-06-01), Wilson et al.
patent: 5366041 (1994-11-01), Shiraishi
patent: 5373912 (1994-12-01), Haiki et al.

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