| 摘要 |
PURPOSE:To improve a traveling stability by estimating the turning action of a vehicle based on a vehicle speed and a steering angle, comparing the estimated value with a value corresponding to an actual turning action, and controlling so as to forcedly change over to a four-wheel-driving condition when the deviation is larger than a set value. CONSTITUTION:A vehicle speed detecting means 61 fol detecting a vehicle speed V, a steering angle detecting means 62 for detecting the steering angle of the steering wheel of a vehicle, and a turning action detecting means 63 such as a lateral acceleration sensor for quantitatively detecting the actual turning action of a vehicle or a yaw sensor, etc. consisting of a gyroscope are provided in a part-time type four wheel drive vehicle. And, based on a detected vehicle speed and the detected steering angle of a steering wheel, the turning action of the vehicle is quantitatively estimated by a turning action estimating means 65 and this estimated value is compared with the detected value of an actual turning action by a comparing means 66. And, when the compared value differs more than a previously set set value, a changeover command signal is outputted to a driving changeover means 56, to change over to a four-wheel- driving condition at the time of traveling in a two-wheel-traveling condition.
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