Motor Drive Control for Zero-Torque Charging and Heating
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Solution Overview
Problem
Current electric vehicle systems require complex control policies to manage torque output, battery charging, and heating processes separately, leading to inefficiencies and increased risk of failures, especially in low-temperature conditions.
Innovation Solution
A motor drive apparatus and method that integrates a three-phase inverter, three-phase motor, and buck side capacitor to simultaneously control battery charging, torque output, and heating by adjusting current values and duty cycles based on required heating and charging powers, without additional boost or heating modules, using a coordinated control method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate control policies are used for torque output, heating, and battery charging, then each function can be independently controlled, but the overall control system becomes complex and the risk of failures increases
Solution Approach 1:
The patent combines three separate control functions (torque output control, heating control, and battery charging control) into a single integrated control policy. The controller simultaneously manages all three functions by coordinating the three-phase inverter and buck converter, eliminating the need for separate control systems while maintaining independent control capability through unified control algorithms.
Solution Approach 2:
The control system is designed to perform multiple functions simultaneously using the same hardware components. The three-phase inverter and buck converter are controlled to achieve torque output, heating, and battery charging in one integrated control framework, making the control system universal and multi-functional rather than requiring dedicated control systems for each function.
2Reliability
If additional boost or heating modules are added to the circuit, then heating and charging functions can be enhanced, but the circuit structure becomes more complex and costs increase
Solution Approach 1:
The patent makes the existing three-phase inverter and buck converter perform multiple functions simultaneously. By coordinating the switching devices and control algorithms, the system achieves torque output, heating, and battery charging without adding boost modules or dedicated heating modules, thus maintaining simple circuit structure while enhancing functional capability.
Solution Approach 2:
The system uses its existing components (three-phase inverter and buck converter) to serve multiple purposes including heating and charging. The motor and inverter components generate heat that can be utilized for heating functions, and the buck converter simultaneously charges the battery, allowing the system to serve itself rather than requiring additional dedicated components.
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 integrated approach simplifies the circuit structure, reduces costs, and lowers the risk of failures by effectively managing zero torque output, battery charging, and heating functions, allowing the heating function to be used for both the power battery and passenger compartment.
Implementation Method 1
a three-phase inverter, a three-phase motor, and a buck side capacitor connected in sequence
Implementation Method 2
the three-phase inverter and the three-phase motor to heat a heat exchange medium flowing through at least one of the three-phase inverter or the three-phase motor
Data Source
AI summary
The present disclosure discloses a motor drive apparatus, a method for controlling the same, a vehicle, and a readable storage medium, where the control method includes: obtaining a required heating power and a required charging power; and adjusting a current value and direction of each phase current of a three-phase motor based on the required heating power, the required charging power, and an output of the motor at a zero torque, to simultaneously control a process of charging a power battery by a power supply module, the torque of the three-phase motor at a zero output, and a three-phase inverter and the three-phase motor to heat a heat exchange medium flowing through at least one of the three-phase inverter or the three-phase motor.