Clutch Torque Estimation via Angular Velocity Feedback
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Solution Overview
Problem
Conventional clutch torque estimation methods for dual clutch transmissions (DCTs) are inaccurate due to reliance on unreliable engine torque models, especially in transient states, leading to errors in clutch torque estimation.
Innovation Solution
A method that corrects engine torque errors by deducing engine transient torque based on measured angular velocity, static torque, and load torque, and estimates clutch torque from the difference between estimated and measured angular velocities, using a feedback loop to refine the estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional observer theory is used to estimate clutch torque based on engine torque, then the estimation method is simple, but the accuracy deteriorates in transient states due to unreliable engine torque models
Solution Approach 1:
The patent implements a feedback mechanism where the estimated clutch torque is fed back into the estimation process to continuously correct and refine the torque estimation. This feedback loop compensates for errors in the engine torque model during transient states, maintaining high accuracy without significantly increasing system complexity
Solution Approach 2:
The patent changes the estimation approach by switching from relying solely on engine torque models to using a combination of engine angular velocity measurements, static torque data, and dynamic corrections. This parameter change enables accurate torque estimation during transient states where traditional models fail
2Ease of operation
If engine torque from ECU is used for clutch torque estimation, then the data is readily available, but errors occur due to differences between ECU torque and actual torque in transient states
Solution Approach 1:
The patent introduces an intermediary correction mechanism that processes the ECU engine torque data through a series of calculations involving angular velocity differentiation, static torque lookup, and dynamic correction factors. This intermediary processing transforms the readily available but inaccurate ECU torque data into reliable clutch torque estimates
Solution Approach 2:
The patent substitutes the direct use of ECU engine torque with a physics-based estimation approach using angular velocity measurements and torque dynamics equations. This substitution replaces reliance on potentially inaccurate sensor/ECU data with a more reliable physical model that accounts for transient behavior
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 provides accurate clutch torque estimation, improving reliability and accuracy over conventional methods, especially in transient states, and enhances clutch control in DCTs.
Implementation Method 1
an engine angular velocity measured using a sensor
Implementation Method 2
a transmission torque occurring at the frictional surfaces of clutch disks
Data Source
AI summary
A method of estimating a torque of a transmission clutch may include correcting an error by deducing an engine transient torque based on an engine angular velocity measured using a sensor, an engine static torque deduced using a data map, and a load torque depending on a driving load, deducing an engine angular velocity estimation value based on the engine static torque and the engine transient torque, and deducing a clutch torque estimation value depending on a slip in the transmission clutch from a difference between the engine angular velocity estimation value and the measured engine angular velocity.