| 摘要 |
PROBLEM TO BE SOLVED: To properly control the vehicle behavior in a transient state by a rudder angle ratio variable-type steering device for changing a ratio of a rotating angle of a steering wheel of a vehicle and a tire turning angle in accordance with a vehicle driving condition. SOLUTION: This steering angle ratio variable-type steering device wherein the ratio of the rotating angle of the steering wheel of the vehicle and the tire turning angle is changed in accordance with the vehicle driving condition, determines a steering angle ratio on the basis of the sum of a proportional depending on the rotating angle of the steering wheel and a differential depending on a rotating angle speed of the steering wheel, and the differential is transferred from a positive zone to a negative zone in accordance with increase and decrease in car speed. Whereby in a low speed zone, the steering angle ratio is changed in such manner that the faster the steering wheel is operated, the more the tire turning angle is increased, and in a high speed zone, the steering angle ratio is changed to lower the response of the tire turning angle to the steering of the steering wheel. COPYRIGHT: (C)2004,JPO |
