Drive Motor Speed Control for Wheel Slip Prevention
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Solution Overview
Problem
Existing engine drag torque control systems in motor vehicles are complex and slow, leading to excessive brake slip and reduced lane stability due to their reliance on multiple control units and long control loops, which cannot respond quickly enough to prevent wheel locking or slipping.
Innovation Solution
A method that determines driving situation information to set a minimum speed for the drive motor, ensuring it operates above this speed to prevent wheel slipping, thereby simplifying the control loop and allowing faster response times by directly regulating the motor speed rather than individual wheel speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual wheel speed control is implemented using multiple control units, then wheel slip prevention capability is improved, but control loop complexity and response time are worsened
Solution Approach 1:
The patent combines the functions of multiple control units (electronic lane control system and engine control unit) into a single integrated control unit that directly controls the drive motor speed. This merging eliminates the complex communication interfaces and long control loops between separate units, reducing system complexity while maintaining wheel slip prevention capability through direct motor speed regulation.
Solution Approach 2:
The patent extracts the essential function of wheel slip prevention from the complex multi-unit control system and implements it through a simplified direct drive motor speed control mechanism. By taking out the core control logic and implementing it within a single control unit that directly regulates motor speed, the system achieves the same safety function with reduced complexity.
2Measurement precision
If multiple control units communicate to regulate wheel speed, then control precision is improved, but response speed is worsened
Solution Approach 1:
The patent extracts the speed control function from the complex multi-unit communication system and implements it directly within a single control unit. This eliminates communication delays and allows the control unit to respond immediately to wheel slip conditions by directly adjusting drive motor speed, achieving both precision and fast response.
Solution Approach 2:
The patent skips the intermediate communication steps between multiple control units and implements direct speed control of the drive motor within a single control unit. This rushing through of the control process eliminates communication overhead and achieves faster response times while maintaining control precision through direct motor speed regulation.
3Adaptability or versatility
If a long control loop with multiple control units is used, then comprehensive vehicle system control is improved, but phase reserve and stability are worsened
Solution Approach 1:
The patent merges the control functions of multiple units into a single control unit that directly regulates drive motor speed. This consolidation shortens the control loop, increases phase reserve, and improves stability while maintaining comprehensive vehicle system control capability through integrated management of drive motor, braking system, and steering actuators.
Data Source
AI summary
A method for controlling a drive motor in a motor vehicle may include the steps: determining driving situation information which describes a static friction and/or a frictional connection of at least one wheel of the motor vehicle and/or a speed of the motor vehicle, determining a minimum speed of the drive motor as a function of the driving situation information, and regulating or controlling the speed of the drive motor as a function of the minimum speed, in particular such that the speed is always greater than the minimum speed.