| 摘要 |
<p>PURPOSE:To prevent the unprepared shift of speed change gear by providing a speed change control means which permits speed change gear shift only when a state where driving wheel speed is kept in a speed change gear range after shifting the speed change gears during traction control continues for time longer than fixed time even when the driving wheel speed changes to get over the boundary point of the speed change gear shift. CONSTITUTION:A speed change control means D executes speed change gear shift as follows; S1, during traction control; S2, when average rear wheel speed is less than a fixed value at which speed change shock is caused with hunting; S3, even when the average rear wheel speed changes to get over a speed change line (when the signal of shift up is given); S4, when the changing rate of the average rear wheel is more than fixed value; S5, in the case where the change gear shift is permitted by the speed change control means D only when a state where the average rear wheel speed is kept in speed change gear range after shifting the speed change gear continues for time longer than fixed time. Thus, in the case where either of right and left rear wheels spins greatly to rapidly make the average rear wheel speed higher, and the rear wheel speed return to original speed immediately after that, the speed change gear shift can not be done, and the hunting is effectively prevented.</p> |
