EV Charging Control for Rotor Torque and Parking Sprag Protection
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Solution Overview
Problem
During quick charging of electric vehicle batteries, the rotor torque generated by the driving motor's three-phase coil can cause deterioration and damage to the parking sprag, leading to potential accidents when the gear is not properly secured.
Innovation Solution
An apparatus and method that calculate the expected rotor torque before charging and adjust the vehicle's position to reduce the rotor torque to below a reference level by moving the vehicle a specified distance, thereby preventing damage to the parking sprag and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging is performed using the driving motor's three-phase coil for voltage boost, then quick charging capability is improved, but rotor torque causes deterioration and damage to the parking sprag
Solution Approach 1:
The control device calculates the rotor angle before charging and determines the rotor torque in advance. When the rotor torque exceeds the reference value, the system performs a preliminary action by moving the vehicle a specified distance to adjust the rotor angle to a neutral position before charging begins, preventing excessive torque from damaging the parking sprag during charging
2Reliability
If the vehicle is moved to adjust rotor angle, then parking sprag protection is improved, but charging time increases due to preliminary vehicle movement
Solution Approach 1:
The control device changes the rotor angle parameter by moving the vehicle a specified distance when the calculated rotor torque exceeds the reference value. This parameter adjustment aligns the rotor to a neutral position where torque during charging will be minimal, protecting the parking sprag while enabling charging to proceed
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
Prevents damage to the parking sprag and reduces the risk of accidents by ensuring the rotor torque remains below a safe threshold during charging, allowing for secure and safe charging operations.
Implementation Method 1
an inverter that boosts the voltage of the charging power source supplied from the electric vehicle supply equipment to a specified level or more and provides the boosted voltage to the high-voltage battery
Implementation Method 2
a magnetic field, which is caused by current supplied to the three-phase coil of the driving motor for the voltage boost, generates a force that aligns the magnetic field generated from the permanent magnet inside a rotor
Implementation Method 3
rotor torque is generated by the force
Data Source
AI summary
An apparatus for controlling charging of an electric vehicle is configured to calculate a rotor torque expected to occur during charging based on an angle of a rotor provided in a driving motor before charging is performed by multiple input voltages, and allow charging to be performed after inducing the rotor torque to be less than a reference torque by moving the electric vehicle a specified distance to correct the rotor angle when the calculated rotor torque is greater than the reference torque so as to avoid deterioration or damage to a parking sprag. As a result, it is possible to prevent the parking sprag from being damaged by the rotor torque generated during charging so as to avoid the occurrence of an accident.