Patent ID: 9494230
Filing Date: 2016-11-15
CPC Classification: F16H

Claim Text:
1. A control unit of an automatic transmission that has a hydraulic circuit in which at least one of a plurality of hydraulic valves disposed in an oil circulation part of the hydraulic circuit is operated by a solenoid, the control unit comprising: a switcher provided on a power supply path and switching ON and OFF of a supply of a solenoid electric current flowing in the solenoid; a detector detecting an actual value of the solenoid electric current flowing in the solenoid; a microprocessor, the microprocessor configured to include a corrector determining whether a coupled oscillation of the plurality of hydraulic valves coupled via oil in the hydraulic circuit has occurred by obtaining oil pressure information from the hydraulic circuit and correcting the PWM signal upon determining that the coupled oscillation has occurred, wherein the corrector corrects the PWM signal to have a corrected state of the solenoid electric current, in which at least one of an amplitude and a cycle of the solenoid electric current in the corrected state is different from a non-corrected state of the solenoid electric current.