Wheel Adhesion Torque Control for Slip-Limited Vehicle Traction
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Solution Overview
Problem
Existing vehicle control systems fail to account for individual wheel adhesion capabilities, leading to wheel slip, reduced tractive effort, vibration, and component degradation due to uniform torque settings that do not match varying friction levels at wheel-route interfaces.
Innovation Solution
A vehicle control system that determines individual wheel adhesion values and assigns torque settings based on these capabilities, using a controller to manage torque within a designated wheelslip margin and adhesion utilization, adjusting for factors like friction-modifying materials and wheel position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uniform torque settings are assigned to all wheels, then control simplicity is maintained, but wheels with limited adhesion will slip and vehicle performance is reduced
Solution Approach 1:
The patent applies local quality by assigning different torque settings to different wheels based on their individual adhesion capabilities. The controller determines available adhesion for each wheel and calculates specific torque values tailored to each wheel's characteristics, rather than applying uniform torque across all wheels. This localized approach optimizes each wheel's contribution to propulsion while preventing slip.
2Reliability
If conservatively low torque settings are assigned to prevent wheel slip, then wheel slip is avoided, but vehicle acceleration and travel speed are limited
Solution Approach 1:
The patent changes the parameter of torque assignment from uniform to individualized based on adhesion characteristics. By calculating available adhesion for each wheel and determining optimal torque settings within safe margins, the system dynamically adjusts torque parameters to maximize vehicle speed while maintaining reliable slip prevention. This allows aggressive control without exceeding adhesion limits.
3Ease of operation
If equal tractive effort is provided to all wheels, then initial control is simplified, but wheels experience excessive slip and vibration occurs
Solution Approach 1:
The patent implements feedback by continuously monitoring wheel performance and adjusting torque assignments based on actual adhesion conditions. The controller determines available adhesion for each wheel and uses this information to calculate appropriate torque settings, creating a closed-loop control system that prevents vibration and slip while maintaining smooth operation.
4Productivity
If individual wheel adhesion is accounted for with customized torque settings, then vehicle performance is maximized, but control system complexity increases
Solution Approach 1:
The patent applies self-service by having the control system automatically determine available adhesion for each wheel and calculate optimal torque settings without requiring external intervention or complex manual configuration. The system serves itself by using sensor data and embedded algorithms to autonomously optimize torque distribution, maximizing performance while keeping the interface simple.
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
Enhances vehicle performance by maximizing tractive effort and reducing vibration through optimized torque distribution, avoiding wheel slip and component damage.
Implementation Method 1
obtain a respective available adhesion value for the first wheel at an interface with the route segment
Data Source
AI summary
A vehicle control system includes a controller comprising one or more processors. The controller is configured to determine a respective force exerted on a route segment by a first wheel of a plurality of wheels of a vehicle and obtain a respective available adhesion value for the first wheel at an interface with the route segment. The controller is configured to determine a respective effective adhesion value to utilize for driving rotation of the first wheel. The effective adhesion value is within a designated wheelslip margin relative to the available adhesion value for the first wheel without exceeding the available adhesion value. The controller is further configured to assign a torque setting to rotate the first wheel based at least in part on the respective force exerted on the route segment by the first wheel and the effective adhesion value for the first wheel.