Electric Vehicle Torque Control for Low-Friction Traction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric vehicles with dual motors struggle to maintain four-wheel-drive capability on low-friction surfaces like snowy or sandy roads, leading to reduced driving mobility and discomfort due to wheel slip issues.
Innovation Solution
An electric vehicle system that independently determines and controls the target torque for each motor based on the accelerator pedal displacement, ensuring both front and rear wheels receive driving force, preventing single-motor activation and enhancing mobility on low-friction surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the vehicle is configured to use only one motor under smaller driving load to lessen transmission loss, then transmission loss is reduced, but four-wheel-drive capability is lost on low-friction surfaces
Solution Approach 1:
The control system dynamically switches between single-motor operation and dual-motor operation based on driving conditions. Under normal conditions, only one motor operates to reduce transmission loss. When wheel slip is detected or accelerator pedal displacement exceeds a threshold, the system transitions to dual-motor operation to maintain four-wheel-drive capability and improve traction.
2Loss of energy
If only one motor is used to drive the vehicle, then transmission loss is reduced, but driving mobility on slippery surfaces degrades
Solution Approach 1:
The control system continuously monitors wheel slip conditions and accelerator pedal displacement as feedback signals. When wheel slip is detected or the accelerator pedal displacement exceeds a predetermined threshold, the control system responds by activating both motors to improve driving mobility on slippery surfaces while returning to single-motor operation under normal conditions to minimize transmission loss.
3Loss of energy
If the vehicle uses conventional single-motor activation logic, then transmission loss is reduced, but natural driving feeling is lost when wheels slip
Solution Approach 1:
The system dynamically adjusts motor activation based on real-time driving conditions. When the accelerator pedal displacement exceeds a predetermined threshold or wheel slip is detected, both motors are activated to provide natural driving feedback and prevent the discomfort of wheel lock-up, while maintaining single-motor operation during normal driving to reduce transmission loss.
Data Source
AI summary
An electric vehicle is presented. The electric vehicle may include a front motor for driving a front wheel; a rear motor for driving a rear wheel; a target torque determiner for determining a target torque of the front motor and a target torque of the rear motor, based on at least a displacement amount of an accelerator operation member operated by a driver; and a motor controller for controlling the front motor and the rear motor to cause the front motor to output the target torque and the rear motor to output the target torque.