Electric Vehicle Torque Distribution for Yaw Stability and Power Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric vehicles face challenges in optimizing torque distribution to improve electricity mileage while ensuring vehicle stability, particularly with multiple drive motors.
Innovation Solution
A method for controlling an electric vehicle that distributes torque to left and right wheels based on a predetermined reference yaw moment, compensates for yaw errors, and adjusts torque distribution based on vehicle states to minimize power loss and maintain stability, using a controller to manage driving and braking torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If torque distribution control is implemented to improve electricity mileage, then power loss is reduced, but vehicle stability control complexity increases
Solution Approach 1:
The patent implements dynamic torque distribution control that adapts to real-time vehicle states. The controller continuously adjusts torque allocation to front and rear wheels based on detected vehicle conditions (driving state, braking state, steering angle, wheel speed), transforming a static control system into a dynamic one that optimizes power loss reduction while managing complexity through state-based decision logic
Solution Approach 2:
The system changes control parameters (torque distribution ratios) based on vehicle state parameters. By monitoring variables such as steering angle, wheel speed, and vehicle acceleration, the controller adjusts torque allocation parameters to minimize power loss in different operating conditions, effectively resolving the contradiction through parameter adaptation
2Power
If multiple drive motors are installed to improve performance, then vehicle capability is enhanced, but torque distribution complexity increases
Solution Approach 1:
The patent segments the torque control function into independent front and rear wheel control modules. Each drive motor's torque output is independently controlled based on its respective wheel's conditions, allowing the system to manage multiple motors through modular segmentation rather than centralized complex control
Solution Approach 2:
The controller performs preliminary determination of driving and braking states before executing torque distribution. By pre-assessing vehicle conditions and predicting required torque allocations, the system simplifies real-time control of multiple motors through advance decision-making, reducing the complexity of simultaneous multi-motor coordination
3Loss of energy
If torque is optimized for electricity mileage, then power loss decreases, but vehicle stability may be compromised
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors vehicle state (wheel speed, steering angle, acceleration) and adjusts torque distribution accordingly. This closed-loop feedback ensures that torque optimization for power loss reduction automatically adapts to maintain vehicle stability, resolving the contradiction through real-time feedback adjustment
Solution Approach 2:
The torque distribution control system serves multiple functions simultaneously: it optimizes power loss for electricity mileage improvement while also maintaining vehicle stability and handling. The same control algorithm performs both energy optimization and stability control, making the system universal in addressing multiple objectives without requiring separate control mechanisms
Data Source
AI summary
A method for controlling an electric vehicle may include receiving driving information including a requested driving torque, a requested braking torque, and a steering angle of a driver, from a detection unit, distributing a driving torque or a braking torque to a left wheel and a right wheel of the vehicle based on a predetermined reference yaw moment, to follow the requested driving torque or the requested braking torque, determining whether a vehicle state is a braking state, distributing a driving torque to a front wheel and a rear wheel of the vehicle according to an optimal total power loss curve minimizing a power loss of the vehicle, when the vehicle state is a driving state, and distributing a braking torque to the front wheel and the rear wheel by comparing a minimum tire slip curve and an ideal braking force distribution curve, when the vehicle state is the braking state.