Dual-Clutch Transmission Synchronizer Position Forecasting
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Solution Overview
Problem
Existing methods for double-clutch gearboxes do not effectively calculate the positions of synchronization sleeves, leading to noise, wear, and reduced driving pleasure during gear shifts.
Innovation Solution
A method that calculates the positions of synchronization sleeves by applying engine torque setpoint curves with fixed levels, measuring, and memorizing positions during engagements, and using these to forecast and control clutch positions for minimal torque difference, thereby optimizing gear shifts and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If clutch positions are controlled without calculating synchronizer sleeve positions, then gear changes can be executed, but noise and wear increase during gear shifts
Solution Approach 1:
The system performs preliminary measurements of synchronizer sleeve positions during preparation phases before actual gear engagement. These measurements are stored and used to predict positions during subsequent gear changes, allowing the control system to anticipate and prepare for optimal clutch operation points, thereby reducing noise and wear.
Solution Approach 2:
The system implements a feedback mechanism where actual synchronizer sleeve positions measured during preparation phases are compared with predicted positions during driving phases. This feedback loop continuously refines the prediction accuracy, enabling precise clutch control that minimizes harmful effects like noise and wear.
2Ease of operation
If clutch engagement is optimized for smooth gear changes, then driving pleasure improves, but torque transmission continuity may be compromised
Solution Approach 1:
The system dynamically adjusts clutch engagement characteristics based on real-time conditions by using measured synchronizer sleeve positions to predict optimal engagement points. This dynamic adaptation allows the system to maintain smooth gear changes while ensuring torque transmission continuity through precise timing and control of clutch operation.
Solution Approach 2:
The system changes operational parameters of the clutch engagement process by adapting clutch control based on predicted synchronizer sleeve positions. This includes adjusting engagement speed, timing, and torque transfer characteristics to simultaneously achieve smooth transitions and maintain torque continuity.
Data Source
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AI summary
The invention relates to a method for calculating positions of specific points of synchroniser sleeves of a dual-clutch transmission driven by an engine for a vehicle, said transmission including two half-transmissions each controlled by one clutch, characterised in that, during a preparation phase for each gear engaged in a half-transmission, it applies a set engine torque curve comprising different fixed torque levels, and it engages gears of the other half-transmission during said levels, measuring and memorising positions of specific points (120, 122, 124) of the synchroniser sleeves during said engagements, and then, during driving phases of the vehicle, it calculates forecast positions for the specific points (120, 122, 124) by comparison with the memorised positions of the specific points (120, 122, 124) during similar driving conditions.