EV Torque Distribution Switching for Stability and Comfort
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for torque distribution in electric vehicles often conflict between minimizing power consumption and maintaining driving dynamics, stability, and comfort, as mode switching can lead to reduced stability, inconsistent vehicle behavior, and increased discomfort due to factors like slip effects and understeer gradients.
Innovation Solution
A computer-implemented method and system that evaluates the actual driving situation before switching torque distribution modes, preventing mode switches if they would compromise safety or comfort, using a loss model to determine the most energy-efficient distribution while considering factors like lateral acceleration, friction force, and understeer gradient, and allowing mode switches only when conditions are safe and comfortable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If torque distribution mode switching is implemented to minimize power consumption, then energy efficiency is improved, but driving dynamics stability deteriorates
Solution Approach 1:
The system performs preliminary evaluation of the actual driving situation (including lateral acceleration, friction force, and understeer gradient) before executing a mode switch. This advance assessment ensures that mode switching only occurs when it will not compromise driving dynamics stability, thereby resolving the contradiction between energy efficiency improvement and stability maintenance.
Solution Approach 2:
The system continuously monitors driving situation parameters (lateral acceleration, friction force, understeer gradient) and uses this feedback to dynamically control mode switching decisions. This closed-loop feedback mechanism allows the system to maintain stability while optimizing energy efficiency by switching modes only when conditions are appropriate.
2Loss of energy
If torque distribution mode switching is implemented to minimize power consumption, then energy efficiency is improved, but vehicle comfort deteriorates
Solution Approach 1:
The system evaluates comfort-critical parameters (lateral acceleration, friction force, understeer gradient) before mode switching. This preliminary check prevents mode switches that would cause discomfort from occurring, while still allowing energy-efficient mode switches when conditions permit, thus resolving the contradiction between energy efficiency and comfort.
3Loss of energy
If torque distribution mode switching is implemented to minimize power consumption, then energy efficiency is improved, but vehicle safety deteriorates
Solution Approach 1:
The system performs preliminary safety assessment by evaluating lateral acceleration, friction force, and understeer gradient before mode switching. This ensures that mode switches are only executed when they will not compromise vehicle safety, thereby resolving the contradiction between energy efficiency improvement and safety maintenance.
Data Source
AI summary
The disclosure relates to a method to control torque distribution among a plurality of electric machines connected to at least one front wheel and at least one rear wheel of a vehicle during operation, comprising: acquiring the total torque requested; obtaining the most energy efficient torque distribution mode by using a loss model or loss map; evaluating the actual driving situation; determining if a mode switch is allowed depending on the actual driving situation; switching the torque distribution mode, if allowed; and preventing a mode switch, if not allowed.