Twin Clutch Gear Shift Actuator Control for Dog Portion Re-engagement
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Solution Overview
Problem
In twin clutch type transmission systems, there is a risk of dog portions of movable and fixed gears re-engaging, leading to delays in gear shift operations and discomfort for the rider.
Innovation Solution
A control device and method that includes a clutch control unit and a shift actuator control unit to manage torque signals and rotation positions, ensuring that dog portions are effectively disengaged and preventing re-engagement by shifting the actuator to a neutral position after gear shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift actuator is driven to cancel meshing of a dog clutch when a dog tip caught state is detected, then the dog tooth can be drawn out from the dog hole, but the dog portions may re-engage with each other causing delay in gear shift operation
Solution Approach 1:
The control unit drives the shift actuator in advance to a position that prevents re-engagement of dog portions after the initial disengagement. This preliminary positioning action ensures that when the dog clutch is disengaged, the dog portions cannot re-engage, thereby eliminating the need for subsequent corrective actions and preventing gear shift delays.
Solution Approach 2:
The control unit acts as an intermediary that coordinates between the shift actuator and clutch control motor. It manages the sequencing of operations by first driving the shift actuator to a safe position, then controlling the clutch control motor to disengage the dog clutch, ensuring that the dog portions remain separated and preventing re-engagement.
2Reliability
If the shift actuator returns to neutral position after gear shift, then dog portions are prevented from re-engagement, but the operation complexity increases
Solution Approach 1:
The control unit merges multiple control functions into a single integrated control system. It simultaneously manages the shift actuator positioning and the clutch control motor operation, coordinating both actions through a unified control logic that prevents dog portion re-engagement while simplifying the overall control structure.
Solution Approach 2:
The control unit incorporates feedback mechanisms that monitor the positions of the shift actuator and the engagement state of the dog clutch. Based on this feedback, the control unit dynamically adjusts the control signals to ensure the shift actuator returns to the appropriate position, preventing re-engagement while adapting to real-time system conditions.
Data Source
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AI summary
In a gearbox of a twin clutch type, dog portions of a movable gear and a fixed gear, which are disengaged once from each other in a transmission mechanism on a side that is disengaged at the time of a gear shift, may be re-engaged with each other. Provided is a control device relating to a vehicle of the twin clutch type, in which, when shifting a gear to another speed, a shift actuator control unit outputs a target position signal so as to shift a rotation position of a shift actuator to a gear shift position at which a gear shift operation is performed by a transmission mechanism, a clutch control unit outputs torque signals so as to connect a clutch that transmits power to, among movable gears and fixed gears, a movable gear or a fixed gear having a dog portion to be disengaged, and then the shift actuator control unit outputs the target position signal so as to return the rotation position of the shift actuator to a neutral position.