PURPOSE: To contrive the improvement in the stability of a vehicle at the time of braking by increasing the decrement of hydraulic pressure in the brake of a rear wheel, when the suspension characteristic is changed so as to decrease the roll rigidity ratio of the front wheel to the rear wheel.
CONSTITUTION: If a controller 17 changes the suspension characteristics of respective wheels each of which comprises a fluid cylinder 3 and a gas spring 5 via proportional flow control valves 9 so as to decrease the roll rigidity ratio of the front wheel 2F to the rear wheel 2R, the steering characteristic of a vehicle tends to have an under-steer decreasing tendency. In this case, if the rear wheels have a lock tendency at the time of braking, the under-steer tendency is enhanced, and sometimes they have an over-steer tendency, therefore the decrement of hydraulic pressure in the brake of the rear wheel 2R is controlled so as to be increased via a controller 87 and a brake hydraulic pressure control means 88, so that the braking force of the rear wheel 2R can be decreased. Thus, the improvement in the stability of the vehicle at the time of braking can be contrived.
MORITA TOSHIKI
HIRABAYASHI SHIGEFUMI
NAKAJIMA TOSHIO
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