Electric Vehicle Active Safety Control via Motor Torque
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Solution Overview
Problem
The existing electronic stability control systems for electric vehicles face challenges with slow response times and inadequate operational stability due to the complexity of hydraulic braking systems and limited regenerative braking force, leading to potential vehicle instability and reduced safety.
Innovation Solution
An active safety control system for electric vehicles that utilizes driving torques and feedback braking torques of four motors, combined with hydraulic braking, to rapidly stabilize the vehicle and improve safety by performing yaw control and compensating for limited feedback braking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic braking system is used for ESP control, then vehicle stability control can be achieved, but response speed is slow and system complexity increases
Solution Approach 1:
The patent replaces the traditional hydraulic braking system with an electric braking system using independently controlled motors at each wheel. The motor controllers receive signals from the ESP control unit and directly adjust motor torque to provide braking force, eliminating hydraulic components and significantly improving response speed while maintaining vehicle stability control capability.
Solution Approach 2:
The patent extracts and removes the hydraulic braking components from the ESP system, keeping only the essential control function. By using electric motors with direct torque control, the system eliminates the hydraulic actuation system while maintaining the core stability control functionality through electronic control of motor torques.
2Reliability
If hydraulic braking system is used for ESP control, then vehicle stability control can be achieved, but device complexity increases
Solution Approach 1:
The patent substitutes the complex hydraulic braking system with a simpler electric braking system. Each wheel has an independently controlled motor that can be directly actuated by the ESP control unit through motor controllers, eliminating hydraulic pumps, reservoirs, valves, and brake lines, thereby significantly reducing system complexity.
Solution Approach 2:
The patent makes the motor system multi-functional by using the same motors and motor controllers for both drive/propulsion functions and braking/ESP control functions. This eliminates the need for separate hydraulic braking components, reducing overall system complexity while maintaining both propulsion and stability control capabilities.
3Device complexity
If regenerative braking only is used, then system simplicity is maintained, but braking force is insufficient for rapid stabilization
Solution Approach 1:
The patent implements dynamic braking force adjustment by having the ESP control unit continuously monitor vehicle state and dynamically adjust motor torques in real-time. The motor controllers can rapidly modulate braking force levels based on current slip conditions, allowing the system to provide sufficient braking force for rapid stabilization while maintaining simplicity through electronic control.
Solution Approach 2:
The patent uses feedback from wheel speed sensors and ESP control unit to continuously monitor vehicle slip conditions and adjust motor braking torques accordingly. This closed-loop control enables the system to dynamically optimize braking force application, ensuring sufficient stabilization capability while maintaining system simplicity through electronic regulation rather than complex mechanical systems.
Data Source
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AI summary
The present disclosure discloses an electric vehicle and an active safety control system and method thereof. The system includes: a wheel speed detection module (100) configured to detect a wheel speed to generate a wheel speed signal; a steering wheel rotation angle sensor (10) and a yaw rate sensor module (9), configured to detect state information of the electric vehicle; a motor controller (1); and an active safety controller (8) configured to receive the wheel speed signal and state information of the electric vehicle, obtain state information of a battery pack (2) and state information of four motors (3), obtain a first side slip signal or a second side slip signal according to the wheel speed signal, the state information of the electric vehicle, the battery pack (2) and the four motors (3), and according to the first side slip signal or the second side slip signal, control four hydraulic brakes (12) of the electric vehicle and control the four motors (3) by using the motor controller (1).