Abnormality detecting device for hydraulic system

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 lower 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 higher 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.

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 set to be 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 set to be lower than and close to the second oil pressure level, and wherein, when the oil pressure adjusting mechanism changes the oil pressure from the first oil pressure level to the second oil pressure level, which is set to be lower than the first oil pressure level, the oil pressure comparing section compares, during the determination time, the oil pressure detected by the oil pressure detecting section with the determination oil pressure level, which is set to be higher than and close to the second oil pressure level;
• 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.