Twin-clutch transmission learning synchronization start displacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In twin-clutch transmissions with synchromesh, gear shift shock and collision sounds occur due to variations in component tolerance and wear, making it difficult to maintain optimal timing for reducing these issues.
Innovation Solution
A twin-clutch transmission system with a gear shift drive mechanism, rotational speed detecting units, and a control unit that learns synchronization start gear shift displacement at predetermined rotational speed differences, allowing for precise control of the synchronizer sleeve's movement to reduce gear shift shock and collision sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the movement speed of the synchronizer sleeve is reduced immediately before the sleeve teeth come into contact with the ring teeth, then gear shift shock and collision sound are suppressed, but the timing control becomes inaccurate due to component tolerance variation and wear
Solution Approach 1:
The control unit determines the movement position of the synchronizer sleeve at which the sleeve teeth come into contact with the gear dog teeth in advance (through learning process), and stores this as synchronization start position information. This preliminary determination allows the system to anticipate the exact timing needed for speed reduction control, compensating for component tolerance variations and wear without requiring real-time measurement adjustments.
Solution Approach 2:
The invention replaces mechanical timing mechanisms (such as fixed-position synchronizers or mechanical speed reduction devices) with an electronic control system. The control unit uses learned position information to electronically control the actuator, replacing mechanical timing references with electronic determination of the optimal speed reduction timing based on actual component positions.
2Device complexity
If fixed timing control is used for synchronizer sleeve movement, then the control system is simple, but the timing deviates from optimum due to component tolerance and wear over time
Solution Approach 1:
The system performs a learning process during initial operation or maintenance periods to determine the actual movement position of the synchronizer sleeve when sleeve teeth contact gear dog teeth. This learned position information is stored and used for subsequent precise timing control, eliminating the need for continuous complex adjustments while maintaining high reliability.
Solution Approach 2:
The control unit automatically learns and stores the synchronization start position information without requiring external calibration or manual adjustment. The system self-adjusts by detecting actual component positions during normal operation, making the control system both simple and highly reliable over time.
Data Source
AI summary
A twin-clutch transmission that can always effectively reduce gear shift shock and a collision sound even under the existence of variation attributed to component tolerance and change over the ages attributed to wear. A twin-clutch transmission calculates a rotational speed difference (|Na−Nb|) between an odd-stage main shaft rotational speed (Na) and an even-stage main shaft rotational speed (Nb) and learns synchronization start gear shift drive displacement (θs) detected by a gear shift drive displacement detecting unit at the timing at which the rotational speed difference (|Na−Nb|) reaches a predetermined synchronization start determination rotational speed difference (Ds) from gear shift start. The twin-clutch transmission controls an actuator on the basis of the learned synchronization start gear shift drive displacement (θs).