Dry Clutch Transfer Torque Prediction via Actuator Stroke
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Solution Overview
Problem
The existing technologies face challenges in accurately predicting and controlling the transfer torque of a dry clutch in automatic transmissions, leading to excessive slip or impact due to variations in tolerance, wear, durability, and thermal deformation, which affects the shift performance and durability of the clutch.
Innovation Solution
A method is proposed to predict the transfer torque of a dry clutch by measuring the actuator stroke and resulting engine torque during specific driving processes, allowing for accurate characterization and control of the clutch, thereby preventing excessive slip and impact, and enhancing shift performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a dry clutch is controlled using a T-S curve showing transfer torque relative to actuator stroke, then the clutch can be automatically controlled, but excessive slip or impact occurs due to variations in tolerance, wear, durability, and thermal deformation
Solution Approach 1:
The patent applies preliminary action by measuring and storing the actual transfer torque characteristics of the dry clutch during a test drive before normal operation. This pre-measured data is stored in memory and used to adjust the control parameters, ensuring that the clutch control is optimized for the specific component characteristics before actual use, thereby preventing excessive slip or impact.
2Device complexity
If the transfer torque of the dry clutch is not accurately detected, then control simplicity is maintained, but shift performance and durability are degraded due to excessive slip and impact
Solution Approach 1:
The patent performs preliminary measurement of transfer torque characteristics during a test drive and stores this data in memory before normal operation begins. This pre-characterization allows the control system to use accurate, component-specific data without requiring complex real-time measurement hardware during actual clutch operation, thus maintaining control simplicity while improving reliability.
3Ease of manufacture
If the clutch control does not account for component variations, then manufacturing and control remain simple, but shift feeling becomes rough and performance is degraded
Solution Approach 1:
The patent implements preliminary characterization by measuring the actual transfer torque during a test drive and storing this component-specific data. This allows the control system to be easily manufactured and implemented using standard components, while the pre-measured data ensures smooth shifting and optimal performance by accounting for individual component variations.
Solution Approach 2:
The patent uses feedback by measuring the actual transfer torque during a test drive and using this information to adjust and optimize the clutch control parameters. The measured data is stored and referenced during normal operation, creating a feedback loop that ensures the control system is tuned to the specific clutch characteristics, resulting in smooth shifting and improved performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables accurate detection and control of the dry clutch's transfer torque, improving shift performance and durability by preventing excessive slip and impact, and providing a smooth shift feeling.
Implementation Method 1
thermal deformation caused by high temperature
Implementation Method 2
thermal deformation caused by high temperature
Implementation Method 3
frictional coefficient of a disk
Data Source
AI summary
A method predicts transfer torque of a dry clutch in a vehicle, in which a characteristic of transfer torque of the dry clutch caused by a stroke of a clutch actuator is accurately detected in a process of detecting a characteristic of a transmission when the vehicle is finished in an assembly line, and is applied to the control of the dry clutch using the clutch actuator, thereby previously preventing a phenomenon in which an excessive slip and an impact occur at the dry clutch and thus improving shift performance, for instance, securing durability of the dry clutch, or obtaining smooth shift feeling.