Wheel Slip Controller Working Point Setting for Stable Torque Transfer
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Solution Overview
Problem
Conventional slip controllers for vehicles face challenges in determining the optimal working point for braking and drive torques due to complex environmental influences, leading to suboptimal control and potential wheel instability.
Innovation Solution
A method for setting the working point of a slip controller that involves monitoring torque and slip conditions, allowing for rapid and precise adjustments by referencing previous effective torque values, especially during activation, and adjusting based on inflection points and predefined limits to maintain optimal torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the working point is adjusted in small steps after wheel stabilization, then control precision is improved, but response time increases
Solution Approach 1:
The patent applies preliminary action by setting the initial working point to a temporally previous torque value before the wheel becomes unstable. This pre-positioning of the working point based on historical data allows the controller to start from a more optimal position, reducing the number of adjustment steps needed and thereby decreasing response time while maintaining control precision.
2Power
If the torque is increased to maximize force transmission, then power is improved, but wheel stability deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the current slip between the wheel and ground, comparing it against the working point setting, and adjusting the torque accordingly. This closed-loop control ensures that torque is increased to maximize force transmission only when slip conditions permit, thereby maintaining wheel stability while optimizing power transmission.
Solution Approach 2:
The patent applies dynamics by making the working point setting adaptive rather than fixed. The controller dynamically adjusts the working point based on real-time slip conditions and temporal torque history, allowing the system to optimize force transmission at each moment while preventing wheel instability. This dynamic adjustment enables the system to respond to changing road conditions and maintain optimal performance.
Data Source
AI summary
A method for setting a working point of a slip controller for a wheel of a vehicle. Upon activating the slip controller, a torque at the wheel is controlled on the basis of the working point using a slip at the wheel, wherein the torque is monitored and a value of the working point is set to a previous value of the torque if the slip satisfies a condition.