Traction Motor Wheel Slip Control via Motoring Force
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wheel slip control systems are inadequate in addressing wheel sliding caused by excessive frictional braking forces, leading to reduced wheel service life, increased operational costs, and limited control over wheeled vehicles due to slow responsiveness in modern braking systems.
Innovation Solution
A traction control system comprising a sensor and a controller that detects wheel sliding and uses a traction motor to apply a motoring slide reducing force, matching the rotational speed of the wheel to the vehicle speed to increase tractive effort and reduce sliding, thereby enhancing adhesion and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If frictional braking forces are applied to slow the vehicle, then vehicle speed is reduced, but wheel sliding occurs when braking force exceeds available friction
Solution Approach 1:
The traction motor acts as an intermediary device between the braking system and the wheel. When wheel sliding is detected, the controller commands the traction motor to apply a motoring force that opposes the excessive braking force, thereby preventing wheel lockup and maintaining optimal adhesion without requiring direct modification of the friction braking system.
Solution Approach 2:
The system continuously monitors wheel speed and compares it to vehicle speed to detect wheel sliding conditions. When sliding is detected (wheel speed diverges from vehicle speed), the controller provides feedback by commanding the traction motor to apply corrective motoring force, creating a closed-loop control system that maintains reliable wheel adhesion during braking.
2Force
If modern friction braking systems are used, then braking capability is provided, but responsiveness is slow due to compressible fluid and substantial control volumes
Solution Approach 1:
The system replaces the slow mechanical/pneumatic braking control with an electrically-controlled traction motor that can rapidly adjust wheel torque. The traction motor's electrical control system responds much faster than pneumatic braking systems, enabling rapid correction of wheel sliding conditions while the friction brakes provide the primary braking force.
3Loss of time
If aggressive braking forces are applied, then vehicle stopping distance is reduced, but wheel wear and surface damage increase
Solution Approach 1:
The system allows aggressive braking forces to be applied when needed for rapid stopping, but only partially applies friction braking to individual wheels that are sliding. The traction motor compensates for the reduced friction braking on affected wheels, maintaining overall braking performance while preventing excessive wear on specific wheels and surfaces.
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
The system effectively prevents wheel sliding, reduces wear on wheels and surfaces, and enhances braking ability by quickly adjusting wheel speed to maintain optimal tractive effort, allowing for faster vehicle speed attainment and improved control.
Implementation Method 1
a traction motor operatively connected to the wheel such that the traction motor selectively applies forces in at least one direction to the wheel during operation
Implementation Method 2
The sensor is configured to detect sliding of a wheel of a vehicle
Implementation Method 3
a frictional braking force... The wheel may slip in relation to the traversed surface when the applied acceleration force exceeds the wheel-contact-surface frictional force
Data Source
AI summary
A system includes a sensor and a controller. The sensor is configured to detect sliding of a wheel of a vehicle. The controller is configured to communicate with the sensor and a traction motor operatively connected to the wheel such that the traction motor selectively applies forces in at least one direction to the wheel during operation. The controller is further configured to direct the traction motor to apply a motoring slide reducing force to the wheel when the sensor detects sliding of the wheel resulting from a frictional braking force.