EV Regenerative Torque Control During Towing Instability
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Solution Overview
Problem
Electrified vehicles face instability and inefficiencies in regenerative braking when being towed by another vehicle, due to external factors like speed and wind.
Innovation Solution
An electrified vehicle system that determines optimal regenerative torque based on the driving direction of the towing vehicle and the relative state of the vehicle's wheels, using a combination of stability and efficiency maps to adjust motor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is performed while the vehicle is being towed, then the battery can be charged, but the vehicle body behavior becomes unstable due to external factors such as speeding or strong wind
Solution Approach 1:
The patent applies dynamics by making the regenerative torque adjustable and adaptive rather than fixed. The controller dynamically modifies the regenerative torque based on detected vehicle states (wheel speed discrepancies, towing conditions) to maintain stability while charging the battery during towing operations
Solution Approach 2:
The patent changes the torque parameter dynamically by determining optimal regenerative torque values based on detected conditions. The system adjusts the magnitude of regenerative torque applied to the motor depending on whether the vehicle is being towed and the degree of wheel speed discrepancy, thereby optimizing both charging efficiency and stability
2Power
If regenerative torque is increased to improve battery charging efficiency, then more energy is recovered, but the vehicle body stability deteriorates under external factors
Solution Approach 1:
The patent changes the torque parameter dynamically by determining optimal regenerative torque values based on detected conditions. The system adjusts the magnitude of regenerative torque applied to the motor depending on whether the vehicle is being towed and the degree of wheel speed discrepancy, thereby optimizing both charging efficiency and stability
3Use of energy by moving object
If the motor continuously outputs regenerative torque to charge the battery, then energy recovery is maximized, but the relative state between left and right wheels becomes unbalanced
Solution Approach 1:
The patent implements feedback by continuously monitoring the relative state between left and right wheels (wheel speed discrepancy) and using this information to adjust the regenerative torque. The controller detects when wheel speeds diverge and modifies torque output to restore balance, creating a closed-loop control system that maintains both energy recovery and wheel synchronization
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
Improves driving stability and maintains regenerative braking efficiency while the vehicle is being towed, by dynamically adjusting regenerative torque to counteract instability and optimize motor efficiency.
Implementation Method 1
The motor provided in the above electrified vehicle is able to charge a battery using the driving force of wheels during deceleration, which is called 'brake energy regeneration' or 'regenerative braking'
Data Source
AI summary
An embodiment method of controlling an electrified vehicle includes, in a towing state of the electrified vehicle in which the electrified vehicle is moving by being towed by a towing vehicle, determining an optimal regenerative torque of a motor provided in the electrified vehicle based on a driving direction of the towing vehicle and a relative state between left and right wheels of the electrified vehicle and controlling the motor based on the optimal regenerative torque.