Twin Clutch Torque Control for Stable EV Deceleration Turning
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Solution Overview
Problem
Electric vehicles with twin clutches face challenges in stabilizing vehicle behavior and improving driving performance during deceleration turning situations, as existing technologies struggle to effectively distribute torque between turning-inner and turning-external wheels.
Innovation Solution
An electric vehicle equipped with a twin clutch system, including a first and second clutch, and a controller that adjusts torque distribution based on predefined conditions such as vehicle speed, steering angle, and accelerator pedal position, to prevent slip and enhance driving dynamics by varying clutch torque application according to drive modes like comfort, sports, and drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a twin clutch system is used to independently control torque distribution to left and right drive wheels, then vehicle dynamics and handling performance are improved, but vehicle behavior becomes unstable during deceleration turning situations
Solution Approach 1:
The controller dynamically changes torque distribution parameters between left and right clutches based on vehicle operating conditions (accelerator pedal position, steering angle, vehicle speed). During deceleration turning, the system adjusts torque to satisfy the relationship T1/T2 ≥ μR/(2-μR) where T1 and T2 are torques on outer and inner wheels respectively, preventing unstable vehicle behavior while maintaining adaptive handling performance
2Reliability
If torque is distributed to turning-external wheel to prevent slip, then driving performance is improved, but vehicle behavior becomes unstable due to excessive torque on outer wheel
Solution Approach 1:
The system dynamically adjusts torque distribution between left and right clutches based on real-time vehicle conditions. During deceleration turning, the controller calculates appropriate torque values satisfying T1/T2 ≥ μR/(2-μR) to prevent slip on the turning-external wheel while avoiding excessive torque that would cause unstable vehicle behavior. The torque distribution is continuously adapted as vehicle conditions change
3Force
If clutch torque is increased to prevent slip during deceleration turning, then traction is improved, but vehicle behavior becomes unstable due to torque mismatch between left and right wheels
Solution Approach 1:
The system applies different torque characteristics to left and right clutches based on their respective wheel positions (inner/outer) during turning. The controller independently controls each clutch to achieve appropriate local torque distribution, satisfying T1/T2 ≥ μR/(2-μR), which provides sufficient traction while maintaining overall vehicle stability during deceleration turning maneuvers
Data Source
AI summary
An electric vehicle includes a drive motor configured for generating power required for driving of the vehicle, a twin clutch which may include a first clutch and a second clutch and configured to adjust distribution of the power supplied from the drive motor to a first drive wheel and a second drive wheel of the vehicle through the first clutch corresponding to the first drive wheel and the second clutch corresponding to the second drive wheel, and a controller electrically connected to the twin clutch and configured to, when a control condition for a deceleration turning of the vehicle is satisfied, determine a control torque of the twin clutch as a larger value of an initial torque to prevent slip of the twin clutch and a base torque determined based on output torque of the drive motor, and distribute the control torque to the first clutch and the second clutch depending on a drive mode of the vehicle.