| 摘要 |
PURPOSE:To automatically select and drive one drive wheel or the other drive wheel by sensing a slip on the drive side during the front wheel or rear wheel drive running. CONSTITUTION:An electronic control device 400 automatically transferring from the two-wheel drive state to four-wheel drive state in response to the running condition is constituted of a front wheel rotating speed sensor 410 detecting the rotating speed of the front wheel, a rear wheel rotating speed sensor 420 detecting the rotating speed of the rear wheel, a comparison circuit 430 detecting the difference of a fixed value or more between the rotating speeds of the front and rear wheels, and a two-wheel/four-wheel transfer means 440 controlling the first solenoid valve 210 to transfer from the four-wheel drive state to the two- wheel drive state when the difference becomes the fixed value or more and to transfer from the two-wheel drive state to the four-wheel drive state when it is within the fixed value. If the difference between the front wheel and rear wheel rotating speeds is fixed value or more during the two-wheel drive, the other side of the front wheel or the rear wheel is controlled and driven. |
