EV Four-Wheel Torque Distribution Under Wheel Slip
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Solution Overview
Problem
The challenge in four-wheel drive electric vehicles is to effectively distribute torque between the front and rear axles to achieve optimal driving efficiency and stability across varying terrains and driving conditions, given the limitations of the electric drive systems.
Innovation Solution
A torque distribution method that involves acquiring total vehicle demand torque, determining demand states through parameter information, and using mathematical models to calculate optimal front and rear axle torque distribution coefficients, accounting for factors like wheel slip, steering stability, gradeability, and maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If torque distribution control is implemented for front and rear axles in four-wheel drive electric vehicles, then driving efficiency and handling performance are improved, but control complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the torque distribution ratio between front and rear axles based on vehicle speed, acceleration demand, and road adhesion conditions. The control system modifies torque allocation parameters in real-time to optimize driving efficiency while managing control complexity through a structured control strategy.
2Reliability
If torque distribution is optimized for different terrains and driving conditions, then road adherence and stability are improved, but the complexity of determining optimal distribution increases
Solution Approach 1:
The patent applies local quality by determining optimal torque distribution for each axle based on local driving conditions such as road adhesion coefficient, vehicle speed, and acceleration demand. The control system adjusts torque allocation independently for front and rear axles according to their specific operational requirements, improving road adherence while managing overall control complexity.
3Power
If mathematical models are used to calculate optimal torque distribution coefficients, then driving force distribution is optimized, but calculation complexity increases
Solution Approach 1:
The patent applies mechanics substitution by replacing complex mechanical torque distribution mechanisms with electronic control and mathematical modeling. The system uses calculation models that consider vehicle speed, acceleration demand, and road adhesion to determine optimal torque distribution coefficients, achieving optimized driving force distribution while reducing mechanical complexity.
Data Source
AI summary
A torque distribution method for four-wheel drive of an electric vehicle, and a system and a vehicle. The method includes: acquiring the total demanded torque of a whole vehicle; determining a demand state of the whole vehicle according to traveling parameter information obtaining a first front and rear axle torque distribution coefficient according to a mathematical model of front and rear axle driving force when front and rear wheels slip simultaneously, and according to the total demanded torque of the whole vehicle; obtaining the front and rear axle torque distribution coefficient according to the first front and rear axle torque distribution coefficient; and obtaining target torque of front and rear driving system according to the front and rear axle torque distribution coefficient and the total demanded torque of the whole vehicle. The best road adhesion performance and the highest driving efficiency of a vehicle can be realized.