Wheel Slip Control Using Driving Device Speed
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Solution Overview
Problem
Existing vehicle slip control systems, such as TCS, struggle to effectively limit wheel slip in All-Wheel Drive vehicles without reference speed information, leading to reduced control responsiveness and performance.
Innovation Solution
A system and method for controlling wheel slip that uses a speed detector to detect the current and past speed of a driving device, allowing a controller to determine a torque calibration command and calibrate the torque command without relying on non-driven wheel speed, enabling effective slip control in All-Wheel Drive vehicles and other configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-driven wheel speed is used as reference speed for slip control, then slip control can be achieved in traditional drive vehicles, but the system cannot be applied to All-Wheel Drive vehicles and control responsiveness is limited
Solution Approach 1:
The patent extracts the essential function of reference speed from the non-driven wheel speed sensor and implements it through driving device speed information combined with slip rate calculation. This allows the system to determine reference speed without relying on non-driven wheel speed, making it applicable to All-Wheel Drive vehicles where no non-driven wheels exist.
Solution Approach 2:
The system uses the driving device's own speed information to generate the reference speed needed for slip control, rather than relying on external non-driven wheel speed information. The driving device speed and slip rate are used together to determine reference speed, creating a self-sufficient system that works in all drive configurations.
2Speed
If conventional slip control methods are used with limited information, then system complexity is reduced, but control responsiveness and slip limit performance deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the driving device speed is continuously monitored and used to calculate slip rate, which in turn is used to determine reference speed and adjust torque calibration. This closed-loop feedback system improves control responsiveness by using real-time speed information without requiring complex additional sensors or systems.
Data Source
AI summary
A method and system for controlling a wheel slip of a vehicle without using a reference speed is provided. The system includes a speed detector that detects a speed of a driving device for operating the vehicle and a controller that determines a torque calibration command based on a torque command of the driving device, and a current speed and a past speed of the driving device detected by the speed detector. The torque command of the driving device is calibrated using the determined torque calibration command, and a driving device is operated based on the calibrated torque command.