Anti-Slip Control for Electromotive Drives
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Solution Overview
Problem
Existing anti-slip control systems for vehicles with electromotive drives face challenges in achieving efficient acceleration while maintaining vehicle stability, as they often decelerate drive wheels excessively when addressing slip issues, leading to loss of traction potential.
Innovation Solution
A device for anti-slip control that includes a controllable converter for each electric drive motor, continuously informed by an anti-slip control device to limit the rotational speed of the rotary field, keeping slip within 10-20%, ensuring stable acceleration and preventing excessive deceleration of drive wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-slip control is implemented by braking the drive wheels, then wheel slip is reduced, but drive wheels are decelerated excessively resulting in loss of traction potential
Solution Approach 1:
The patent replaces the mechanical braking system with an electric motor control system. Instead of using brakes to reduce wheel slip, the invention uses the electric drive motor's torque control capabilities to actively prevent slip by adjusting the rotational torque based on detected wheel speed differences, thereby maintaining traction potential while controlling slip.
Solution Approach 2:
The patent introduces an intermediary control system that monitors wheel speeds and coordinates between the drive motor and braking systems. This intermediary anti-slip control device detects slip conditions and modulates the electric motor's torque output as an intermediate control action, preventing the need for aggressive braking that would lose traction.
2Reliability
If motor torque is reduced to control excessive slip, then wheel slip is reduced, but vehicle acceleration efficiency is compromised
Solution Approach 1:
The patent implements dynamic torque control where the electric motor's rotational torque is continuously adjusted based on real-time wheel speed feedback. The control system dynamically modulates torque to maintain optimal slip levels (10-20%) rather than simply reducing torque, enabling the vehicle to accelerate efficiently while preventing excessive slip through active, adaptive control.
Solution Approach 2:
The patent employs a feedback control mechanism where wheel speed sensors continuously monitor individual wheel velocities, and this information feeds back to the anti-slip control device. The controller compares detected slip conditions against target slip ranges and dynamically adjusts motor torque accordingly, creating a closed-loop system that maintains optimal acceleration while preventing excessive slip.
3Reliability
If the rotational field speed is limited to maintain slip within 10-20%, then traction is maintained, but maximum acceleration potential is restricted
Solution Approach 1:
The patent changes the control parameter from a fixed rotational speed limit to a dynamic slip ratio target of 10-20%. Instead of capping the rotational field speed at a constant value, the system adjusts the effective speed control based on maintaining optimal slip conditions, allowing the rotational speed to vary dynamically while preserving traction through active slip management rather than passive speed limiting.
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
This solution allows for optimal vehicle acceleration with improved driving stability by limiting slip within a safe range, ensuring that drive wheels do not exceed a 10-20% rotational speed advantage over the vehicle's speed, thus preventing excessive deceleration and maintaining traction.
Implementation Method 1
electromotive vehicle drives that use electric machines as drive motors and can be operated in the motor mode as well as in the generator mode, have a rotational torque which is generated by the Lorentz force
Data Source
AI summary
An anti-slip control device for a vehicle having an electromotive drive system includes one or more electric driving motors. In order to limit wheel slip, the rotational speed of the driving wheels is regulated by controlling the rotational speed of the rotary field generated in at least one electric driving motor, each electric driving motor being fed by a controllable converter associated therewith. In order to control the rotational speed, the anti-slip control device constantly informs each converter about the maximum allowed rotational speed of the driving motor or driving wheel associated with the respective converter.