Abnormality detection device for hydraulic circuit and abnormality detection method for hydraulic circuit

摘要

Abnormality detection device for a hydraulic circuit with oil pump capable of increasing pressure of oil sucked through a suction port and discharging the oil through discharge ports; a switching unit switching between fully and partially discharged states; a pressure regulation unit regulating oil pressure; and a hydraulic pressure detection unit that detects the oil pressure includes: a storage unit that stores a maximum discharge pressure in the partially discharged state; a switching control unit that switches to either one of the discharged states; a pressure regulation control unit that sets a target pressure higher than the maximum discharge pressure in the partially discharged state, and performs pressure regulation control to achieve the target pressure; and a determination unit that determines whether the switching unit has a fixation abnormality in one of the discharged states by comparing hydraulic pressure with maximum discharge pressure in the partially discharged state.