| 摘要 |
PURPOSE:To improve the speed change characteristic by juding the belt slip and increasing the line pressure when the actual speed change ratio is set outside the max. or min. speed change ratio in the mechanism of the transmission speed is set outside the max. transmission speed in the mechanism. CONSTITUTION:The actual speed change ratio (i) is calculated in a calculation part 45 from the outputs of the revolution speed sensors 41 and 42 for detecting the revolution speed of the primary and the secondary pulleys in a continuously variable transmission during the driving of a car. Further, the aimed speed change ratio (is) is calculated in a calculation part 46 from the outputs of the secondary pulley revolution speed sensor 42 and a throttle opening degree sensor 44. Further, the transmission speed di/dt is obtained in a calculation part 48 from (i), (is), and the coefficient (k) set is accordance with acceleration speed. When (i) is set outside the standard value of the max. or min. speed change ratio in the mechanism, or when the di/dt is set outside the max. transmission speed in the mechanism, slip is judged by a slip judging part 63, and the correc tion factor alpha corresponding to the slip quantity is selected to increase the line pressure. |
