| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a diagnostic apparatus for a hydraulic control actuator capable of appropriately discriminating high-pressure side sticking and low-pressure side sticking of an actuator.SOLUTION: A diagnostic apparatus 100 for a hydraulic control actuator drives a line pressure control valve 30 which regulates the pressure of a hydraulic oil discharged from a hydraulic pump 20 for discharging the hydraulic oil of the discharge amount in response to the driving revolution speed between the upper limit line pressure and the lower limit line pressure so that the pressure of the hydraulic oil comes closer to a target line pressure. The diagnostic apparatus includes actual hydraulic pressure detection means 50 for detecting an actual hydraulic pressure after pressure regulation by the line pressure control valve, determination value setting means for setting a high-pressure side sticking determination value which increases in response to the increase of the driving revolution speed so as to substantially match the characteristic at the time of high-pressure side sticking of the hydraulic control actuator, and sticking determination means for determining high-pressure side sticking of the hydraulic control actuator when the actual hydraulic pressure substantially matches the high-pressure side sticking determination value in a state where the difference between the target line pressure and the upper limit line pressure is equal to or more than the prescribed value.</p> |
