Traction control system for a four-wheel drive vehicle

Details Traction control system for a four-wheel drive vehicle Traction control system for a four-wheel drive vehicle

1998-02-18

1999-06-22

Mai, Lanna

Motor vehicles

Having four wheels driven

With means for braking either structure transmitting drive...

180197, 701 70, 701 78, 3031132, B60R 17356

Patent

active

059133775

ABSTRACT:
The present invention is directed to a traction control system for a four-wheel drive vehicle, which includes a braking operation detector for detecting operation of a brake pedal, an accelerating operation detector for detecting operation of an accelerator pedal, and a slip detector for detecting a slip of each wheel of the vehicle. A braking force controller is provided for controlling a pressure control apparatus to perform a traction control by supplying the hydraulic braking pressure discharged from an auxiliary pressure source to wheel brake cylinders operatively mounted on the wheels under a slip condition, when the accelerating operation detector detects the operation of the accelerator pedal and the slip detector detects the slip of at least one of the wheels. The braking force controller is adapted to control the pressure control apparatus to communicate all of the wheel brake cylinders with a hydraulic pressure generator such as a master cylinder, when the braking operation detector detects the operation of the brake pedal on condition that the traction control is being performed, with the communication between the pressure generator and all of the wheel brake cylinders blocked. Accordingly, when the brake pedal is depressed during the traction control, or immediately thereafter, the braking operation is effectively initiated.

REFERENCES:
patent: 4762376 (1988-08-01), Matsubara
patent: 4872730 (1989-10-01), Takagi et al.
patent: 4884650 (1989-12-01), Fujiki et al.
patent: 4900105 (1990-02-01), Burgdorf et al.
patent: 5407257 (1995-04-01), Iwata
patent: 5547266 (1996-08-01), Beck et al.
patent: 5782543 (1998-07-01), Monzaki et al.

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