Friction Clutch Torque Estimation via Angular Speed Feedback
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Solution Overview
Problem
Existing methods for estimating the torque transmitted by a friction clutch in motor vehicles are not precise, fast, or robust against data uncertainties and noise, which hinders the ability to maintain performance and driving comfort by updating the transmissibility map of the actuator over time due to wear and changing conditions.
Innovation Solution
A procedure involving the measurement of engine shaft angular speed and torque, calculation of speed differences, and using an electronic controller to estimate clutch torque based on a mathematical model, while accounting for rotational inertia and transmissibility characteristics, to provide a precise, rapid, and noise-resistant estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional estimation methods are used for clutch torque, then the estimation can be obtained, but the precision is insufficient and the estimation is slow
Solution Approach 1:
The patent implements a feedback mechanism by continuously comparing the measured engine shaft angular speed with the estimated angular speed from the mathematical model, using the speed difference to iteratively refine and update the clutch torque estimation, thereby achieving both high precision and rapid convergence
Solution Approach 2:
The patent replaces direct mechanical measurement of clutch torque with an indirect estimation approach using a mathematical model that relates engine shaft dynamics to clutch torque, substituting complex mechanical sensing with computational estimation based on measurable parameters
2Reliability
If conventional estimation methods are used for clutch torque, then the estimation can be obtained, but the robustness against data uncertainties and noise is insufficient
Solution Approach 1:
The feedback loop continuously corrects the torque estimation by comparing model predictions with actual measurements, filtering out noise and compensating for uncertainties through iterative refinement
Solution Approach 2:
The patent dynamically adjusts estimation parameters based on operating conditions, adapting the mathematical model to changing system characteristics and maintaining robustness across different工况
3Reliability
If the transmissibility map is not updated, then the control algorithms can operate with existing data, but the performance and driving comfort deteriorate over time due to wear and changing conditions
Solution Approach 1:
The estimated clutch torque from the mathematical model provides feedback for updating the transmissibility map, enabling the control system to adapt to wear and changing conditions while maintaining optimal performance
Solution Approach 2:
The patent performs preliminary estimation of clutch torque using the mathematical model before actual control actions are taken, allowing the transmissibility map to be proactively updated to prevent performance degradation
Data Source
AI summary
A process that estimates the torque transmitted by a friction clutch coupled to the shaft of a motor vehicle engine. The process includes determining the angular speed of the engine shaft and the torque developed by this shaft; calculating the difference between the measured value of the engine shaft's angular speed and an estimated value of the angular speed; and determining an estimated value of the torque transmitted by the clutch, corresponding to the calculated value of the difference or error in the engine shaft angular speed. The estimated value of the torque is used, along with the value measured or otherwise determined of the torque developed by the engine shaft, to obtain the estimated value of the angular speed of the engine shaft on the basis of a predetermined mathematical model.