| 摘要 |
PURPOSE:To improve the feeling of speed shift, by conducting division into the stages of the start, finish and middle of speed shift on the basis of rotation number signals, and changing an electrical signal to a line pressure control means stage by stage by means of an open loop in opposition to this division. CONSTITUTION:An electronic control device 4 is inputted with the respective signals of a T/M input rotation number sensor 1, a T/M output rotation numbers sensor 2 and a throttle sensor 3, and discriminates the point of speed shift, and then, drives speed shift solenoids 12, 13. Simultaneously, division into the start stage, finish stage and middle stage of speed shift is made on the basis of the signals of both rotation number sensors 1, 2, and an electrical signal to a linear solenoid valve 23 which is a line pressure control means, is changed stage by stage by means of a open loop in opposition to this division, that is, the line pressure is changed multi-stage-wise. Thus, a careful hydraulic control can be conducted, and the improvement of the feeling of speed shift can be realized without damaging the durability of an engaging element. |
