| 摘要 |
PROBLEM TO BE SOLVED: To prevent the unnecessary rise in the line pressure by controlling the line pressure according to the cylinder pressure of an output shaft, setting the control range of the forward/backward clutch hydraulic pressure corresponding to the permissible range of the cylinder pressure of an input shaft, and regulating the upper limit of the line pressure using the forward/backward clutch hydraulic pressure. SOLUTION: The output pressure of a linear solenoid valve 72 to be controlled according to the cylinder pressure of an output shaft is introduced from a port 58a to a line pressure control valve 58, the clutch pressure to be outputted by a clutch pressure control valve 80 is introduced from other port, and the line pressure is controlled based on the clutch pressure. The clutch pressure is introduced in place of the cylinder pressure of the input shaft, and the line pressure is controlled according to the cylinder pressure of the input shaft by a linear solenoid 88, and when the line pressure rises unnecessarily, the line pressure opens a spool against the clutch pressure and the energizing force of a spring, and the line pressure can be dropped. Thus, the divergent rise of the line pressure can be suppressed. |
