Drive force distribution control system for four-wheel drive mot

Details Drive force distribution control system for four-wheel drive mot Drive force distribution control system for four-wheel drive mot

1988-10-19

1989-12-26

Marmor, Charles A.

Motor vehicles

With means for detecting wheel slip during vehicle...

180248, B60K 1734

Patent

active

048892041

ABSTRACT:
A drive force distribution control system in a four-wheel drive motor vehicle for distributing drive forces from an engine of the motor vehicle to first and second wheels of the motor vehicle includes drive force distributing means for distributing and transmitting the drive forces to the first and second wheels, first speed detecting means for detecting a rotational speed (Nf) of the first wheel, second speed detecting means for detecting a rotational speed (Nr) of the second wheel, torque detecting means for detecting a torque (Tr) transmitted to the second wheel, and control means for controlling the drive force distributing means. The control means for calculating a slip ratio (S) of the second wheel to a road on which the motor vehicle is running based on the rotational speeds of the first and second wheels, calculating a ratio (Tr/S) between the torque (Tr) and the slip ratio (S), determining a distribution ratio between the drive forces to be distributed to the first and second wheels based on the ratio between the torque and the slip ratio, and controlling the drive force distributing means to distribute and transmit the drive forces to the first and second wheels according to the distribution ratio.

REFERENCES:
patent: 4712635 (1987-12-01), Sumiy et al.
patent: 4733760 (1988-03-01), Inagaki et al.
patent: 4757870 (1988-07-01), Torii et al.

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