CONTROL DEVICE OF AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To provide a control device of an automatic transmission which can suppress the lowering of controllability caused by coupled vibration.SOLUTION: An electronic control device 30 is used in an automatic transmission in which at least one of a plurality of hydraulic valves arranged at an oil circulation portion of a hydraulic circuit is operated by a linear solenoid 17. The electronic control device comprises: a switch 31 for making a current flow to the linear solenoid; a current detection part 32 for detecting an actual current value of the linear solenoid; a target current value calculation part 40 for calculating a target current value; a current feedback control part 43 which sets a duty ratio so that the actual current valve follows the target current valve, and creates a PWM signal of the duty ratio at a prescribed cycle; and a correction part 42 which determines the presence or absence of coupled vibration by acquiring the hydraulic pressure information of the hydraulic circuit, and corrects the PWM signal when it is determined that the coupled vibration is generated. The correction part corrects the PWM signal so that at least either of the vibration and the cycle of a current flowing in the linear solenoid is brought into a state different from a state that the correction is not performed.SELECTED DRAWING: Figure 2