Electric Motor Output Limiting for Abnormal Torque Control
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Solution Overview
Problem
Existing electric mobility systems lack effective methods to prevent excessive motor output contrary to a driver's intention, which can lead to dangerous situations due to MCU controller failures or abnormal control states.
Innovation Solution
A method and system that monitor battery power information and motor torque to detect abnormalities in real time, performing step-by-step control to limit motor output, including primary, secondary, and tertiary controls to ensure safety, and incorporate error counting for MCU resets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor output is increased to meet driving demands, then the productivity and performance of the electric mobility is improved, but the risk of excessive output contrary to driver's intention increases, leading to safety hazards
Solution Approach 1:
The patent implements a feedback mechanism where the VCU continuously monitors battery power information and compares it with motor torque requirements. When abnormal excessive output is detected, the system provides feedback to limit the motor output, thereby maintaining safety while allowing normal high-performance operation.
Solution Approach 2:
The system performs preliminary safety checks by calculating battery power information and comparing it with motor torque before excessive output can occur. The VCU proactively identifies abnormal situations and takes preventive action to limit motor output, preventing dangerous situations rather than reacting after they occur.
2Reliability
If the motor output is limited to prevent excessive output, then the driver safety is improved, but the productivity and performance of the electric mobility deteriorates
Solution Approach 1:
The patent applies partial limiting action by only restricting motor output when abnormal excessive output is detected through comparison of battery power information with motor torque requirements. During normal operation, the motor operates at full performance, and limiting is applied only partially when safety concerns arise.
3Reliability
If the system continuously monitors battery power information and motor torque to detect abnormalities, then the driver safety is improved, but the device complexity increases
Solution Approach 1:
The VCU performs multiple functions using the same hardware resources: it manages battery power information calculation, motor torque monitoring, abnormality detection, and motor output control. This multi-functionality reduces the need for separate dedicated components for each safety function, thereby limiting device complexity while maintaining comprehensive safety monitoring.
Data Source
AI summary
Provided is a method for safely operating and controlling an electric motor in an electric mobility. The method comprises the steps of: obtaining first battery power information provided by a BMS while a vehicle is traveling; measuring second battery power information according to a motor torque depending on the driver's pedal opening degree in each driving situation; comparing the first and the second battery power information with each other; determining whether the motor is abnormal on the basis of the compared result; and performing control to limit motor output step by step when the motor is determined to be abnormal.