Front-Rear Wheel Torque Control for Collision-Avoidance Stability
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Solution Overview
Problem
Existing electric vehicle control systems struggle to independently control front and rear wheels effectively, leading to challenges in collision avoidance and operational stability, particularly after a collision has occurred.
Innovation Solution
A vehicle control device and method that adjusts the control amounts of drive motors for the front and rear wheels based on various factors such as steering angles, angular velocities, and friction coefficients to maintain specified control ranges, using a processor to identify and adjust control amounts for feedforward and feedback control to enhance collision avoidance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control amount of drive motors is increased to improve collision avoidance performance, then the collision avoidance capability is improved, but the operational stability after collision avoidance deteriorates
Solution Approach 1:
The control system dynamically adjusts the drive motor control amounts based on the collision avoidance progress and vehicle state. During collision avoidance, higher control amounts are applied to achieve rapid yaw and roll angle changes for effective avoidance. After avoidance, the control amounts are reduced to maintain operational stability, preventing excessive vehicle movement or loss of control
Solution Approach 2:
The system continuously monitors vehicle parameters including yaw angle, roll angle, steering angle, and wheel speeds to determine collision avoidance progress. Based on this feedback, the processor adjusts the control amounts of front and rear drive motors in real-time, reducing control amounts when the vehicle returns to a stable state after avoidance maneuvers
2Stability of the object's composition
If the control amount range is strictly limited to ensure stability, then operational stability is improved, but collision avoidance performance deteriorates
Solution Approach 1:
The system employs dynamic control amount adjustment within a specified range rather than fixed limits. The processor determines appropriate control amounts based on real-time vehicle state and collision avoidance progress, allowing the system to utilize the full available control range when needed for effective avoidance while maintaining stability through controlled reductions
3Ease of operation
If independent control of front and rear wheels is implemented to improve operational stability, then vehicle controllability is improved, but system complexity increases
Solution Approach 1:
The control system is divided into separate control paths for front and rear drive motors, with the processor independently determining control amounts for each based on vehicle state and collision avoidance progress. This segmented approach enables independent optimization of front and rear wheel control while maintaining overall system coordination
Solution Approach 2:
The processor implements a universal control algorithm that handles both normal driving stability control and collision avoidance maneuvers through the same independent front-rear wheel control mechanism, eliminating the need for separate control systems for different operating conditions
Data Source
AI summary
A vehicle control device includes a processor and a drive motor. The processor may identify whether a host vehicle is in situation where the host vehicle is avoiding a collision, identify a first control amount and a second control amount, and adjust a front wheel control amount, or a rear wheel control amount, such that the front wheel control amount and the rear wheel control amount fall within the specified control amount range based on the front wheel control amount which is identified according to the first control amount and the second control amount and is a control amount of a drive motor that controls the front wheel, the rear wheel control amount which is identified according to the first control amount and the second control amount and is a control amount of a drive motor that controls the rear wheel, and the specified control amount range.