| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control device which can determine whether or not an abnormality occurs even in a period other than a play reduction period.SOLUTION: A hydraulic control device 1 controls supply pressure being hydraulic pressure which is supplied to friction elements 5a to 5e. The friction elements 5a to 5e comprise pistons 7 which can reciprocate by the supply pressure, and first engagement plates 6a and second engagement plates 6b which are engaged with each other and released in the engagement by the movement of the pistons 7. Detection means 54a to 54b detect the contact of the pistons 7 and the first engagement plates 6a. First determination means determines whether or not a detection value of the supply pressure which is detected by hydraulic sensors 53a to 53b is smaller than a first threshold when the contact of the pistons 7 and the first engagement plates 6a is not detected by the detection means 54a to 54b. Therefore, in a period in which the contact of the pistons 7 and the first engagement plates 6a is not detected when the first engagement plates 6a and the second engagement plates 6b are engaged with each other, the presence or absence of an abnormality of the hydraulic control device can be determined.SELECTED DRAWING: Figure 1 |
