ABNORMALITY DETERMINATION DEVICE OF VEHICLE HYDRAULIC CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an abnormality determination device of a vehicle hydraulic circuit which can specify that which of an electric hydraulic pump and a solenoid valve is failed without increasing the number of part items.SOLUTION: An electronic control device 20 determines that an abnormality exists in an electric hydraulic pump 16 on the basis of the fact that a turbine rotation number Nt of a torque converter 30 is not smaller than a blow-determination rotation number D within a prescribed time B after a rising time point t2 at which a rotation number of an engine 24 reaches a prescribed value A or larger, and also determines that an off-abnormality exists in a linear solenoid valve SL1 on the basis of the fact that the turbine rotation number Nt after the lapse of the prescribed time B is not smaller than a linear solenoid valve failure determination rotation number C which is larger than the blow-determination rotation number D, and thereby it becomes possible to specify that which of the electric hydraulic pump 16 and the linear solenoid valve SL1 is failed without increasing the number of part items.