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AssigneeJatco Transtechnology Ltd.
InventorsKazuhiro Takatori, Osamu Sato, Yasushi Fujita, Tatsuya Imamura, Toshihide Fukasawa
Estimating the term…
A standby phase target time is determined with reference to a table according to a read engine load and vehicle speed. A standby phase real time is then measured, and a learning correction value is calculated and stored. In a next shifting operation, a value that is found by adding the learning correction value to a hydraulic pressure command value in the previous shifting operation is used as a new hydraulic pressure command value. This learning correction is performed in small regions where the vehicle speed increases with the throttle opening being substantially constant. This accurately compensates a change in characteristics of a hydraulic system without being affected by a rapid change in torque or the like.
A hydraulic control system of an automatic transmission, which outputs a hydraulic pressure command value increased to a high level, maintained at a low level for a predetermined period of time and then increased at a predetermined inclination until a gear ratio starts changing, and engages an unengaged engagement device in response to a shifting command for shifting from a first gear ratio to a second gear ratio according to an operating condition, said hydraulic control system comprising:
A hydraulic control system of an automatic transmission, which outputs a hydraulic pressure command value increased to a high level, maintained at a low level for a predetermined period of time and then increased at a predetermined inclination until a gear ratio starts changing, and engages an unengaged engagement device in response to a shifting command for shifting from a first gear ratio to a second gear ratio according to an operating condition, said hydraulic control system comprising:
A hydraulic control system of an automatic transmission, which outputs a hydraulic pressure command value increased to a high level, maintained at a low level for a predetermined period of time and then increased at a predetermined inclination until a gear ratio starts changing, and engages an unengaged engagement device in response to a shifting command for shifting from a first gear ratio to a second gear ratio according to an operating condition, said hydraulic control system comprising:
Dependencies are inferred from the claim text.