Rear-Wheel Braking Control for Automatic EV Drifting
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Solution Overview
Problem
Existing vehicle drifting technologies require skilled driver operations, leading to steering wheel kickback and poor driver experience, making it difficult for common drivers to perform drifting maneuvers.
Innovation Solution
A braking system for electric vehicles that includes a central controller and wheel end braking apparatuses, allowing automatic drifting by controlling rear wheel braking forces based on vehicle speed, pedal positions, and steering angles, reducing the need for complex driver inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If driver operations are used for drifting, then drifting can be achieved, but driver skill requirements increase and operation complexity increases
Solution Approach 1:
The system enables the vehicle to perform drifting maneuvers autonomously based on driver input signals. The control system automatically coordinates braking forces across multiple wheels and manages vehicle dynamics without requiring the driver to manually execute complex braking and steering sequences, allowing the vehicle to serve itself in executing the drifting maneuver.
Solution Approach 2:
The patent replaces manual mechanical operations (driver's coordinated braking and steering actions) with an electronic control system that automatically manages wheel braking forces and vehicle dynamics. The electronic control system substitutes the mechanical skill-based operation with automated electronic control, reducing the need for driver skill while maintaining drifting functionality.
2Reliability
If driver operations are used for drifting, then drifting can be achieved, but steering wheel kickback occurs and driver experience deteriorates
Solution Approach 1:
The control system continuously monitors vehicle state parameters including steering angle, wheel speeds, and braking forces. Based on this feedback, the system dynamically adjusts braking forces on individual wheels to maintain desired vehicle behavior during drifting, preventing steering wheel kickback by coordinating brake application with steering input in real-time.
Solution Approach 2:
The system applies different braking forces to different wheels based on their specific roles in the drifting maneuver. The control system independently manages braking at each wheel end, applying localized braking forces to rear wheels to induce drift while coordinating with front wheel braking to control steering behavior, thereby eliminating steering wheel kickback.
3Ease of operation
If automated braking control is implemented, then drifting operation simplicity increases, but system complexity increases
Solution Approach 1:
The control system integrates multiple functions into a single automated drifting control mechanism. It simultaneously manages braking force distribution across all wheels, vehicle speed control, steering coordination, and drift angle regulation, making the system versatile enough to handle various drifting scenarios without requiring separate control systems for each function.
Solution Approach 2:
The electronic control system acts as an intermediary between the driver's simple input signal and the complex coordinated actions required for drifting. It translates the driver's intent into precise braking force commands for each wheel, managing the complexity of coordinating multiple actuators while presenting a simple interface to the driver.
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
Enables simple driver operations for drifting, improving control stability and safety, and enhancing the overall driving experience by automating the drifting process.
Implementation Method 1
Each wheel end braking apparatus is configured to output braking force to a brake disc of one wheel to brake the electric vehicle
Data Source
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AI summary
A braking system for an electric vehicle for automatic drifting, a control method, and the electric vehicle relate to the field of new energy vehicles, and may be applied to a pure electric vehicle and a hybrid electric vehicle. The braking system includes a central controller and a plurality of wheel end braking apparatuses. Each wheel end braking apparatus is configured to output braking force to a brake disc of one wheel to brake the electric vehicle. The central controller is configured to: in a traveling process in which a vehicle speed of the electric vehicle is greater than a vehicle speed threshold, when an opening of an accelerator pedal of the electric vehicle is less than an accelerator threshold, an opening of a brake pedal of the electric vehicle is less than a braking threshold, a rotation angle of a steering wheel of the electric vehicle is greater than an angle threshold, and a steering angle of the electric vehicle is less than a drifting threshold, control wheel end braking apparatuses corresponding to rear wheels of the electric vehicle to output braking force. According to this solution, drifting can be implemented through only a simple operation, to reduce a drifting operation threshold and improve driving experience of the vehicle.