Electric Torque Vectoring Control for Wheel Slip and Turning Stability
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Solution Overview
Problem
Existing torque vectoring electric devices (TVEDs) face challenges in accurately controlling torque distribution between left and right wheels, especially during straight-line movement with wheel slip and during turning, which affects the vehicle's handling and stability.
Innovation Solution
A torque vectoring control device that includes a torque vectoring electric device (TVED) and a controller. The controller determines the torque of a torque vectoring control motor (TVCM) to reduce speed differences between left and right wheels during straight-line movement and adjusts the torque based on driver handling information during turning, thereby enhancing traction control and turning stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a TVED is implemented to adjust torque distribution ratio, then handling performance and movement performance are improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical torque vectoring mechanisms with an electric motor system. The TVED uses a motor to generate torque that is superimposed on the differential output, enabling torque distribution control through electrical means rather than mechanical linkages. This substitution reduces mechanical complexity while maintaining the torque vectoring function for improved handling performance.
Solution Approach 2:
The TVED system performs multiple functions: it controls torque distribution between left and right wheels for handling improvement, provides traction control during wheel slip, and enables torque vectoring without requiring separate mechanical differential modifications. This multi-functionality is achieved through a unified motor control system that handles various driving conditions through software algorithms.
2Measurement precision
If torque vectoring is added to basic differential function, then torque control accuracy is improved, but device complexity increases
Solution Approach 1:
The TVED control system uses feedback from wheel speed sensors and motor position sensors to accurately determine actual torque distribution. The controller continuously monitors wheel speeds, detects slip conditions, and adjusts motor torque in real-time to achieve precise torque control. This feedback mechanism enables accurate torque vectoring without requiring complex mechanical adjustment mechanisms.
Solution Approach 2:
The system achieves precise torque control by dynamically changing motor torque parameters based on driving conditions. The controller calculates required torque vectoring amounts using wheel speed differences, slip ratios, and vehicle state information, then adjusts motor output torque accordingly. This parameter-based control approach provides accurate torque distribution without mechanical complexity.
3Ease of operation
If TVED is used to control torque distribution, then turning performance is improved, but energy loss increases
Solution Approach 1:
The TVED motor operates in periodic pulses rather than continuous operation. The motor generates torque only when torque vectoring is needed for turning or traction control, and remains idle during steady-state driving. This periodic activation reduces energy consumption compared to continuous motor operation, while still providing improved turning performance when required.
Solution Approach 2:
The TVED system recovers energy through the motor's generator function during braking or deceleration, converting kinetic energy back to electrical energy. This regenerative braking capability reduces overall energy loss by回收利用 braking energy, offsetting the energy consumed during torque vectoring operations and improving overall vehicle efficiency.
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
The solution effectively reduces wheel speed differences during straight-line movement and improves vehicle stability and handling during turns by accurately controlling torque distribution based on real-time driving conditions.
Implementation Method 1
a torque vectoring control motor (TVCM)... determines the torque of the TVCM... adjusts the ratio of torques distributed to left and right wheels
Data Source
AI summary
A torque vectoring control device and a method therefor may include a torque vectoring electric device (TVED) that adjusts a ratio of torques distributed to a left wheel and a right wheel using a torque of a torque vectoring control motor (TVCM), and a controller that determines the torque of the TVCM to reduce a difference between speeds of the left wheel and the right wheel when a wheel slip occurs while a vehicle is moving straight, and determines the torque of the TVCM according to handling information of a driver when the vehicle is turning.