PURPOSE: To provide a king pin tilt angle control device which is improved in steering stability by detecting the rearward input of a tire from an earth- contact surface thereof as a result of braking under a condition of braking operation, or under a condition of decelerated vehicle travel resulting from braking operation, controlling the king pin tilt angle only at the time of braking, and thereby increasing the amount of toe-in of a wheel occurring due to the rearward input of the tire to prevent occurrence of toe-out.
CONSTITUTION: The control device comprises the step S1 of reading the amount of brake operation from the amount of stroke of a brake pedal, etc., the step S2 of determining a target king pin tilt angle so that an amount of toe-in capable of preventing occurrence of toe-out at the time of braking may be attained as a result of the rearward input of a tire resulting from braking, the step S3 of calculating a target amount of stroke of hydraulic cylinder necessary to obtain the target king pin tilt angle on the basis of a control map, and the steps S4 to S6 of changing the king pin tilt angle through controlling the hydraulic cylinder so as to execute that target amount of stroke.
KAWAGOE KENJI
FUKUSHIMA NAOTO
