Abnormality detecting device for hydraulic system

摘要

An abnormality detecting device for a hydraulic system is disclosed. The hydraulic system has a pressure level switching mechanism that adjusts oil pressure in accordance with the operating state of an internal combustion engine. The device includes an oil pressure sensor and a ECU. The oil pressure sensor detects an oil pressure that is adjusted by the pressure level switching mechanism. When the pressure level switching mechanism changes the oil pressure from a first oil pressure level to a second oil pressure level, which is higher than the first oil pressure level, the ECU compares the oil pressure detected by the oil pressure sensor with a determination oil pressure level, which is lower than and close to the second oil pressure level. The ECU determines that there is an abnormality in the hydraulic system if the oil pressure detected by the oil pressure sensor does not change to pass the determination oil pressure level.

主权项

1. An abnormality detecting device for a hydraulic system having an oil pressure adjusting mechanism that adjusts oil pressure in accordance with an operating state of an internal combustion engine, the oil pressure being generated by an oil pump that is driven by the internal combustion engine, the device comprising:
an oil pressure detecting section that detects oil pressure adjusted by the oil pressure adjusting mechanism; an oil pressure comparing section, wherein, when the oil pressure adjusting mechanism changes the oil pressure from a first oil pressure level to a second oil pressure level, which is higher than the first oil pressure level, the oil pressure comparing section compares, during a determination time, the oil pressure detected by the oil pressure detecting section with a determination oil pressure level, which is lower than and close to the second oil pressure level; and an abnormality determining section that determines that there is an abnormality in the hydraulic system if the oil pressure detected by the oil pressure detecting section does not change to pass the determination oil pressure level within the determination time, wherein the determination time is determined based on an operating state of the engine.