Motor vehicles – Having four wheels driven – With differential means for driving two wheel sets at...
Patent
1996-10-18
1999-09-07
DePumpo, Daniel G.
Motor vehicles
Having four wheels driven
With differential means for driving two wheel sets at...
180233, 701 89, B60K 1734
Patent
active
059472243
ABSTRACT:
A four-wheel drive control system for an automotive vehicle equipped with a transfer including a friction clutch for distributing a driving force to rear wheels and front wheels under a control of an engaging force of the friction clutch. The four-wheel drive control system comprises a driving force distribution control system which is arranges to (a) set first driving force distributed amounts respectively to the rear and front wheels in accordance with a detected value of a rotational speed difference between the rear and front wheels in a manner that a driving force to be applied to the front wheels increases with an increase in the detected value of the rotational speed difference, (b) set second driving force distributed amounts respectively to the rear and front wheels in accordance with a detected value of a throttle opening degree when the judgment is made such that the vehicle is at starting, and (c) control the engaging force of the friction clutch of the driving force distribution adjusting device in accordance with the first and second driving force distributed amounts. Additionally, the driving force distribution control system includes a second driving force distributed amounts adjusting device for setting smaller the driving force distributed amount of the second driving force distributed amounts to the front wheels when the rotational speed of the front wheels is over that of the rear wheels, than that set when the rotational speed of the rear wheel is over that of the front wheels, at the starting of the vehicle.
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DePumpo Daniel G.
Nissan Motor Co,. Ltd.
LandOfFree
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