Vehicle Wheel Slip Control on Loose Surfaces
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Solution Overview
Problem
Excessive wheel slip on loose surfaces leads to high power consumption and minimal speed increase, reducing vehicle efficiency and range.
Innovation Solution
A method to control the prime mover by comparing vehicle speed to wheel rotational speed and reducing power when the difference exceeds a threshold, using sensors and filters to enhance accuracy, and actuating brakes if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If power to the wheel is increased to maintain vehicle speed on loose surfaces, then vehicle speed is maintained, but wheel slip increases and power consumption increases
Solution Approach 1:
The system continuously monitors wheel rotational speed and vehicle speed, compares them to detect wheel slip, and adjusts prime mover power accordingly. This closed-loop feedback control prevents excessive wheel slip and optimizes power consumption by reducing power when slip is detected and maintaining power only when necessary to maintain vehicle speed.
2Use of energy by moving object
If power to the wheel is reduced to decrease wheel slip, then power consumption decreases, but vehicle speed decreases
Solution Approach 1:
The system dynamically adjusts prime mover power based on real-time detection of wheel slip conditions. Rather than using a fixed power level, the controller continuously modulates power output to maintain optimal balance between reducing wheel slip and maintaining vehicle speed, adapting to changing driving conditions on loose surfaces.
3Speed
If wheel rotational speed is increased to maintain vehicle speed, then vehicle speed is maintained, but the difference between rotational speed and vehicle speed increases
Solution Approach 1:
The system uses feedback control to continuously compare wheel rotational speed with vehicle speed, detecting when the difference exceeds a threshold indicating excessive slip. The controller then reduces prime mover power to bring the wheel speed closer to vehicle speed, maintaining precise control over the speed differential and optimizing traction on loose surfaces.
Data Source
AI summary
A method for controlling a prime mover of a vehicle traveling on a surface including loose particles includes the steps of determining a vehicle speed and a rotational speed of a vehicle wheel. Then comparing the vehicle speed to the rotational speed of the vehicle wheel and if the difference between the rotational speed of the vehicle wheel and the vehicle speed is greater than a threshold, then reducing the power provided to the wheel to maintain the difference between the rotational speed and the vehicle speed within the threshold.