| 摘要 |
PURPOSE:To prevent a line pressure regulating value from being influenced by a flow rate of working oil flowing in a hydraulic servo by a method wherein from a predetermined relation, based on a control value of a flow rate to a flow rate control valve, a line pressure control value is corrected. CONSTITUTION:In a line pressure control valve correcting means, from a relation predetermined so that a line pressure responding to a line pressure control value by means of which a line pressure regulating valve 24 is driven is generated despite of a fluctuation in an inflow flow rate, the line pressure control value is corrected based on a control value of a flow rate to a flow rate control valve 30. Thereby, when by using the line pressure control value after correction, the line pressure regulating valve 24 is driven, a line pressure responding to the line pressure control value is generated despite of a fluctuation in working oil in the flow rate control valve 30. This constitution eliminates a fear of a belt nipping pressure between adjoining discs 7 and 8 on the input side and discs 9 and 10 on the output side being reduced according to a line pressure on the running condition of a vehicle on which a speed ratio is changed rapidly. |
