Dynamic Clutch Torque Map Threshold Adjustment for Hill Start Assistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor vehicle hill start assistance systems face inaccuracies in updating the torque transmission map of the clutch due to poor predetermination of position thresholds, which become unsuitable with clutch wear, leading to incorrect or lack of updating.
Innovation Solution
A device that recalculates and updates position thresholds for the clutch map based on the number of complete updates, using a comparator to determine when to modify these thresholds, and includes a hill start assistance system with a slope sensor and controlled braking to account for clutch wear, allowing automatic release of brakes when sufficient torque is supplied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If predetermined position thresholds are used for updating the clutch torque map, then the updating process is simple, but the precision deteriorates with clutch wear
Solution Approach 1:
The patent makes the position thresholds dynamic by automatically adjusting them based on the detected clutch torque characteristics. Instead of using fixed predetermined thresholds, the system calculates optimal thresholds based on actual clutch behavior, allowing the thresholds to adapt as the clutch wears over time, thereby maintaining measurement precision without increasing system complexity
Solution Approach 2:
The system implements feedback by using the detected clutch torque values to recalculate and update the position thresholds. The thresholds are continuously refined based on the difference between expected and actual torque readings, creating a closed-loop system that improves precision while keeping the updating process automated and simple
2Device complexity
If position thresholds are not updated, then the device complexity remains low, but the reliability deteriorates due to clutch wear
Solution Approach 1:
The system performs self-service by automatically updating its own position thresholds without requiring external intervention or complex manual calibration. The clutch torque map system self-adjusts by detecting wear patterns and recalculating thresholds autonomously, maintaining reliability while keeping the device complexity low through automated self-maintenance
Solution Approach 2:
The patent changes the parameters of the position thresholds based on detected clutch wear. By monitoring torque transmission characteristics over time and adjusting the threshold values accordingly, the system adapts to clutch degradation, ensuring continued reliability of the hill start assistance function without adding complex manual adjustment mechanisms
3Measurement precision
If frequent threshold updates are performed, then the precision is maintained, but the loss of time increases due to repeated recalculations
Solution Approach 1:
The system employs periodic action by updating the position thresholds at predetermined intervals rather than continuously. This approach maintains measurement precision by regularly refreshing the clutch torque map while minimizing time loss by avoiding unnecessary frequent recalculations, striking an optimal balance between precision and efficiency
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a device for determining, when driving a vehicle, a mapping (2) of the torque transmitted by the clutch of the automobile based on the position of a clutch control member (3). The device includes a means (5) for updating the mapping (2) based on position thresholds of the clutch control member (3). Said updating means (5) includes calculation means (7) for modifying the values of said thresholds based on the minimum and maximum values of the positions of the control member (3) stored in said mapping (2) and on the current values of said thresholds.