ABNORMALITY DETERMINATION DEVICE OF LINEAR SOLENOID VALVE FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide an abnormality determination device of a linear solenoid valve for a vehicle which can exactly and easily detect an abnormality of a linear solenoid valve which controls the oil pressure of a hydraulic friction engagement device of a vehicle.

SOLUTION: The abnormality determination device includes: a speed change control means 108 which outputs a standby pressure command signal lower than a first fill-command signal for forming a temporary oil-pressure rise waveform while following the first fill-command signal; a pressure sensor SE for detecting the output oil pressure of the linear solenoid valve SL; and an abnormality determination means 116 which determines the occurrence of an abnormality when a lowering estimation value E indicating the degree of the lowering of the output oil pressure detected by the pressure sensor SE is lower than a preset abnormality determination value J. By this, since the abnormality determination is performed by utilizing difference of the variation of the output oil pressure from the linear solenoid valve SL at an abnormal time and that at a normal time, the abnormality when the linear solenoid valve SL is firmly seized after the start of the speed change control can exactly and easily be detected when a rise in the output oil pressure of the linear solenoid valve SL is started.

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