초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A four-wheel drive control system for a vehicle having main driving wheels and auxiliary driving wheels, the main driving wheels being one of front and rear wheels, the auxiliary driving wheels being the other of rear and front wheels, said control system comprising:drivi

[ What is claimed is:] [1.] A four-wheel drive control system for a vehicle having main driving wheels and auxiliary driving wheels, the main driving wheels being one of front and rear wheels, the auxiliary driving wheels being the other of rear and front wheels, said control system comprising:driving force distribution adjusting means including a friction clutch for distributing a driving force to the main driving wheels and the auxiliary driving wheels under a control of an engaging force of the friction clutch;rotational speed difference detecting means for detecting a difference in rotational speed between the main driving wheels and the auxiliary driving wheels;throttle opening degree detecting means for detecting a throttle opening degree;vehicle running condition judging means for judging starting of the vehicle;driving force distribution control means for (a) setting first driving force distributed amounts respectively to the main and auxiliary driving wheels in accordance with a detected value of the rotational speed difference detected by said rotational speed difference detecting means, in a manner that a driving force to be applied to the auxiliary driving wheels increases with an increase in the detected value of the rotational speed difference, (b) when said vehicle running condition judging means judges the vehicle to be at the starting condition, setting second driving force distributed amounts respectively to the main and auxiliary driving wheels in accordance with a detected value of the throttle opening degree detected by said throttle opening degree detecting means, and (c) controlling the engaging force of the friction clutch of said driving force distribution adjusting means in accordance with the first and second driving force distributed amounts;wherein said driving force distribution control means includes second driving force distributed amounts adjusting means, andwherein, when said vehicle running condition judging means judges the vehicle to be at the starting condition and when the rotational speed of the auxiliary driving wheels is over that of the main driving wheels, said second driving force distributed amounts adjusting means reduces the second driving force distributed amounts to the auxiliary driving wheels.