Torque Transmission Control with Stable Feedback Restart
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Solution Overview
Problem
The control device for torque transmission devices experiences variations in load behavior immediately after feedback control is restarted, leading to potential instability due to differences in output duty before and after control is resumed.
Innovation Solution
The control device includes a mode determination unit that determines operating modes based on target transmission torque changes, and a feedback control adjustment unit that stores integral calculation values before stopping feedback control and restarts it using these values when predetermined conditions are met, ensuring stable behavior by minimizing duty differences during restarts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If feedback control is stopped and restarted, then power consumption is reduced and control is simplified, but load behavior becomes unstable due to variations in output duty before and after restart
Solution Approach 1:
The control device stores the integral calculation value before stopping feedback control. When feedback control is restarted, this stored value is reused to calculate the initial output duty, ensuring continuity and preventing sudden load variations. This preliminary action of saving the integral state resolves the instability caused by control restarts.
2Stability of the object's composition
If feedback control is continuously maintained, then load behavior remains stable, but power consumption increases unnecessarily during steady states
Solution Approach 1:
The control device operates feedback control periodically rather than continuously. It stops feedback control when the operating mode is steady (no mode change detected), and restarts it when mode changes are detected. This periodic operation reduces power consumption while maintaining stability through the integral value storage mechanism that prevents instability during restarts.
Data Source
AI summary
A control device controls a torque transmission device. The torque transmission device includes an actuator that operates by being energized and a torque transmission portion that is switched to a transmission state or a non-transmission state by the actuator operating, and transmits a torque between a first transmission portion and a second transmission portion when the torque transmission portion is in the transmission state. The control device includes a target calculation unit, a mode determination unit, and a control unit. The target calculation unit calculates a target transmission torque that is a torque to be transmitted between the first transmission portion and the second transmission portion. The mode determination unit determines an operating mode among an engagement mode, a release mode, and a steady mode. The control unit controls the actuator based on the operating mode determined by the mode determination unit.