Dry Clutch Torque Estimation via Actuator Stroke Feedback
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Solution Overview
Problem
The existing technologies face challenges in accurately estimating the transmission torque of a dry clutch in automated transmissions, leading to excessive slip and gear shift shocks due to variations in clutch components, abrasion, thermal deformation, and friction factors, making real-time torque control difficult.
Innovation Solution
A method that involves slowly releasing the dry clutch to detect the slip occurrence, storing actuator stroke and engine torque at the slip point, and determining the transmission torque using these values to update the Torque-Speed curve for precise control, ensuring the dry clutch is engaged and locked before slipping, and restoring it to a locked state after data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission torque of the dry clutch is not accurately estimated, then the control algorithm cannot compensate for variations in torque characteristics, but this leads to excessive slip of the dry clutch and gear shift shocks
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual transmission torque through the relationship between actuator stroke and engine torque, then using this detected information to update the T-S curve. This closed-loop feedback allows the system to compensate for variations in torque characteristics caused by component allowances, abrasion, and thermal deformation, thereby preventing excessive slip and gear shift shocks while improving control reliability.
Solution Approach 2:
The patent dynamically changes the parameters of the T-S curve based on detected torque characteristics. By updating the transmission torque values in the T-S curve according to the detected relationship between actuator stroke and engine torque, the system adapts to varying torque characteristics over time, preventing harmful effects while maintaining reliable control.
2Device complexity
If a fixed T-S curve is used for dry clutch control, then the control algorithm is simple, but the transmission torque varies greatly due to component allowances, abrasion, and thermal deformation making the control inaccurate
Solution Approach 1:
The patent performs preliminary detection of the relationship between actuator stroke and engine torque to establish an accurate T-S curve before normal operation. By detecting torque characteristics in advance and updating the T-S curve with this information, the system prepares accurate control data that compensates for variations in torque characteristics, improving measurement precision without requiring complex real-time calculations during operation.
3Productivity
If the dry clutch is released quickly, then the gear shift speed is fast, but this causes excessive slip and reduces the durability of the dry clutch
Solution Approach 1:
The patent dynamically adjusts the dry clutch release characteristics based on the updated T-S curve that reflects actual torque characteristics. By using the detected relationship between actuator stroke and engine torque to modify the T-S curve, the system optimizes the release profile in real-time, enabling fast gear shifts while preventing excessive slip and protecting clutch durability through adaptive control.
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 allows for accurate estimation and control of transmission torque, preventing excessive slip and gear shift shocks, enhancing the durability and smoothness of gear shifts in automated transmissions.
Implementation Method 1
The dry clutch has the characteristics of its transmission torque greatly varying with a plurality of factors, such as the allowance of each of several components, an abrasion degree caused by the progress of endurance, thermal deformation caused by high temperature, and a variation in the friction factor of a disk
Data Source
AI summary
A method of estimating transmission torque of a dry clutch, may include a) slowly releasing a dry clutch until a slip of the dry clutch occurs, b) acquiring and storing stroke of an actuator and torque of an engine at a starting time point at which the slip of the dry clutch occurs at step a), and c) determining the stroke of the actuator and the transmission torque of the dry clutch at the starting time point at which the slip of the dry clutch occurs, by using the stroke of the actuator and the torque of the engine stored at step b).