| 摘要 |
Disclosed is a method used in an automatic transmission for controlling shifting into neutral when a vehicle is stopped in a first speed. The method comprises the steps of (a) determining if a vehicle speed is less than a predetermined speed; (b) determining if a grade in the road is greater than a predetermined value if step (a) is satisfied; (c) determining if a throttle valve opening is 0% if step (b) is satisfied; (d) determining if a present shift speed is a first speed of a drive D range or a drive D2 range if step (c) is satisfied; (e) determining if an oil temperature is greater than a predetermined temperature if step (d) is satisfied; (f) determining if present engine rpm Ne is within a predetermined range if step (e) is satisfied; (g) determining if output rpm of the transmission is 0 rpm if step (f) is satisfied; (h) determining if turbine rpm of a torque converter is 0 rpm if step (g) is satisfied; (i) determining if a brake has been depressed by the driver if step (h) is satisfied; and (j) performing control into neutral if step (i) is satisfied, then returning to the step (c) of determining if the throttle valve opening is 0%. If the vehicle speed is greater than the predetermined speed in step (a), a present shift state is maintained. If the grade in the road is less than the predetermined value in step (b), it is determined if the grade in the road is less than 0%, and if it is, the present shift state is maintained, and if it is not, the process is returned to step (b). Also, if any one of the conditions of steps (c) through (i) is not satisfied, N-D shifting is performed. |
