Battery Heating via Motor Coolant Loop Without Vehicle Jitters
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Solution Overview
Problem
Existing power battery heating methods for vehicles in cold regions often result in vehicle jitters due to inaccurate motor zero position calibration and difficulty in ensuring precise torque current control, leading to oscillations around zero torque.
Innovation Solution
A power battery heating method and apparatus that uses a three-phase inverter and alternating current motor to heat a coolant flowing through the battery, with controlled direct-axis and quadrature-axis currents to maintain a non-zero torque output, preventing vehicle movement and damage while eliminating engagement gaps and jitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the motor is controlled to output zero torque by controlling torque current to be zero, then the power battery can be heated, but the torque current oscillates around zero causing vehicle jitters
Solution Approach 1:
The patent changes the control parameter from zero torque current to a small non-zero torque current that maintains motor rotation without causing vehicle movement. This parameter change eliminates the oscillation around zero while still achieving heating effect through motor losses.
Solution Approach 2:
The patent dynamically adjusts the torque current to a small value that keeps the motor rotating, creating a dynamic balance between heating requirement and vehicle stability. The motor operates in a dynamic state with continuous rotation rather than static zero torque.
2Temperature
If the torque current is controlled to be zero for heating, then the power battery temperature increases, but accurate zero position calibration is difficult and sampling precision deteriorates
Solution Approach 1:
The patent changes the operating parameter from zero current to a small non-zero current, which improves the sampling precision of the current sensor. The small current magnitude ensures accurate measurement while maintaining motor rotation and avoiding vehicle movement.
3Stability of the object's composition
If a small torque output is maintained during heating, then vehicle jitters are eliminated, but heating efficiency may be reduced
Solution Approach 1:
The patent applies partial action by using a small torque current that is sufficient to maintain motor rotation and eliminate jitters, but not excessive enough to cause vehicle movement. This partial torque application achieves the minimum necessary action for stability while still generating adequate heat through motor losses.
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
Effectively heats the power battery without causing vehicle jitters or damage to transmission components, ensuring smooth operation and prolonged battery life by maintaining a small, controlled torque output during the heating process.
Implementation Method 1
controlling an on/off status of a power device in a three-phase inverter, so that the three-phase alternating current motor generates heat according to heating energy provided by a heating energy source, to heat a coolant flowing through the power battery
Data Source
AI summary
This application provides a vehicle and a power battery heating apparatus and method thereof. In the method, when a current temperature value of a power battery is lower than a preset temperature value, and a heating condition of the power battery meets a preset condition, a three-phase inverter is controlled to cause a three-phase alternating current motor to generate heat to heat a coolant flowing through the power battery. A preset quadrature-axis current and a corresponding preset direct-axis current are obtained to control the three-phase inverter to adjust a phase current of the three-phase alternating current motor in the heating process, so that electromagnetic torque with a small torque value is outputted at a motor shaft. The electromagnetic torque causes the motor output shaft to output a pre-tightening force to the transmission mechanism, thereby eliminating an engagement gap and effectively avoiding jitters of the vehicle.