EV Powertrain Boost Charging With Clutch-Decoupled Dual Motors
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Solution Overview
Problem
Conventional boost charging systems for electric vehicles generate torque shocks during charging termination, affecting driving experience and are limited in power applicability due to reliance on single motor circuits.
Innovation Solution
A power system with two powertrains, each comprising a drive motor, motor control unit, and clutch apparatus, where the boost circuit disconnects transmission connection between the motor and wheel during charging to prevent torque transfer, allowing dual motor operation for enhanced power handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor is used for boost charging, then circuit cost is reduced, but the motor generates torque shocks during charging termination that affect driving experience
Solution Approach 1:
The patent divides the single motor system into two separate motors (first motor and second motor), each capable of independent boost charging operation. This segmentation allows the system to isolate torque shock effects to one motor at a time while the other motor remains idle or operates independently, thereby reducing the impact on driving experience while maintaining cost-effectiveness compared to using a single high-power motor throughout.
Solution Approach 2:
The control device disconnects the clutch of the first motor before the second motor completes its charging cycle, preparing the system for seamless switching between motors. This preliminary action ensures that when the first motor finishes charging and needs to be disconnected, the second motor is already ready to take over, preventing torque shocks during the transition and maintaining smooth operation.
2Device complexity
If a single motor is used for boost charging, then the system is simpler, but applicability to different power levels is reduced
Solution Approach 1:
Each motor is equipped with its own clutch and control circuitry, making both motors universally capable of performing boost charging functions. The system can adapt to different power requirements by selectively activating one or both motors based on the charging demand, thereby achieving multi-functionality and enhanced power applicability without significantly increasing system complexity.
Solution Approach 2:
The system dynamically switches between single-motor and dual-motor modes based on real-time power requirements. When high power is needed, both motors operate simultaneously; when lower power suffices, only one motor is activated. This dynamic adaptability allows the system to handle a wide range of power levels efficiently while maintaining a relatively simple overall structure.
3Power
If a high power boost circuit is used, then charging power is sufficient, but circuit cost increases
Solution Approach 1:
Instead of using a single high-power boost circuit, the patent segments the power delivery function across two separate motors, each with its own boost circuit. Each motor's boost circuit operates at a lower power level individually, but together they can deliver high total power when both are active. This segmentation reduces the cost and complexity of individual circuits while maintaining the capability for high-power charging when needed.
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
This solution prevents torque-induced shocks during charging termination and increases the power system's applicability by enabling efficient dual-motor operation, improving the driving experience and charging efficiency.
Implementation Method 1
in a process of boost charging for the power battery, a current passes through a winding of a drive motor, so that a stator magnetic field is generated. The stator magnetic field interacts with a rotor magnetic field, and a torque may be generated.
Data Source
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AI summary
This application provides a power system of an electric vehicle, a controller, and the electric vehicle. The power system provided in this application includes two drive motors and two motor control units. The two drive motors are separately in transmission connection with wheels of the electric vehicle through two clutch apparatuses. Windings of the two drive motors and three-phase bridge arms of the two motor control units form two boost circuits. The two boost circuits are configured to charge a power battery of the electric vehicle by performing boost conversion on an output voltage of a charging pile. The two clutch apparatuses are configured to disconnect a connection between a drive motor corresponding to a boost circuit that is in an operating state and a wheel. The power system provided in this application can reduce shake and noise in a boost charging process of the electric vehicle.