Adaptive Clutch Friction Control for Accurate Torque Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In vehicles equipped with automatic mechanical transmission (AMT)/dual clutch automatic transmission (DCT)/dedicated hybrid transmission (DHT), accurate clutch control is crucial for power, economy, and smoothness, but the variable clutch friction coefficient poses a challenge for precise torque management.
Innovation Solution
A method and apparatus for automatically adjusting the clutch friction coefficient by determining the vehicle state conditions to enter sliding friction and torque deviation collecting states, calculating torque deviations, and adjusting the friction coefficient based on average deviations exceeding a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the clutch friction coefficient is treated as a fixed value, then the control system is simple, but the clutch torque control accuracy deteriorates due to the variable nature of the friction coefficient
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static fixed friction coefficient to a dynamic adaptive friction coefficient that automatically adjusts based on real-time operating conditions. The control system continuously monitors clutch state parameters and updates the friction coefficient through a mapping relationship, enabling the system to adapt to varying temperature, pressure, and sliding conditions without requiring complex manual calibration or multiple fixed coefficient tables.
Solution Approach 2:
The patent implements feedback by using the calculated torque deviation as a feedback signal to adjust the friction coefficient. The system computes the difference between actual and expected torque, feeds this deviation back to the friction coefficient mapping relationship, and automatically updates the coefficient to minimize future deviations. This closed-loop feedback mechanism continuously optimizes clutch torque control accuracy while maintaining relatively simple system architecture.
2Measurement precision
If the clutch friction coefficient is automatically adjusted in real-time, then the clutch torque control accuracy is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies self-service by enabling the friction coefficient to automatically adjust itself based on real-time torque deviation feedback without requiring external manual intervention or complex control algorithms. The system uses the calculated torque deviation to automatically update the friction coefficient mapping relationship, allowing the clutch control system to self-optimize its performance. This self-adjusting mechanism improves torque control accuracy while avoiding the need for additional complex control hardware or sophisticated algorithms.
3Measurement precision
If multiple friction coefficient values are used for different conditions, then the clutch torque control accuracy is improved, but the ease of operation deteriorates due to complex selection criteria
Solution Approach 1:
The patent applies parameter changes by using a continuous friction coefficient mapping relationship that dynamically adjusts the coefficient based on operating parameters such as temperature, pressure, and sliding speed. Instead of requiring discrete selection from multiple fixed coefficient values based on complex condition criteria, the system continuously updates the friction coefficient according to the current operating state and torque deviation. This approach maintains high torque control accuracy while significantly simplifying the operation and control logic, as the system automatically adapts without requiring manual selection or complex decision-making.
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 approach enables accurate control of clutch torque by dynamically adjusting the friction coefficient, enhancing vehicle performance in terms of power, economy, and smoothness.
Implementation Method 1
the clutch friction coefficient reflects the relationship between the clutch torque and the pressure, so the automatic adjustment of the clutch friction coefficient plays an important role in the accurate control of the clutch torque
Data Source
AI summary
A clutch control method, including: determining whether a current vehicle state satisfies a condition for a clutch to enter a sliding friction state; if so, controlling the clutch to enter the sliding friction state, and determining a target sliding friction rotating speed of the clutch; determining whether the current vehicle state satisfies a condition for entering a clutch torque deviation collecting state; if so, collecting a torque deviation once and storing the torque deviation; at an end of an adjustment period, accumulating all torque deviations collected previously and taking an average value according to an accumulation number of times, so as to obtain an average torque deviation; if the average torque deviation exceeds a preset deviation threshold, recording the average torque deviation; and if the current vehicle state satisfies a condition for entering a deviation applying state, adjusting a current clutch friction coefficient according to the recorded average torque deviation.