Electric Vehicle Anti-Theft Control Using Motor Reverse Resistance
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Solution Overview
Problem
Current anti-theft technologies for electric vehicles, such as motor locking, can lead to motor damage due to excessive heat when locked for extended periods, and existing methods do not effectively deter theft.
Innovation Solution
An anti-theft method that activates an electronic anti-theft function, determines if the vehicle is moving and if the motor temperature exceeds a critical value, and either generates a motor reverse resistance or a vibration noise to deter theft while preventing motor damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is locked for anti-theft, then theft difficulty increases, but motor temperature becomes too high and motor is damaged
Solution Approach 1:
The motor locking is applied periodically rather than continuously. The controller activates the motor to generate reverse resistance in intermittent cycles, allowing the motor temperature to return to normal between cycles while still maintaining anti-theft effectiveness over time.
Solution Approach 2:
The system dynamically adjusts the motor locking strategy based on real-time temperature monitoring. When temperature exceeds a threshold, the locking duty cycle is reduced or paused, allowing temperature to decrease, thereby preventing motor damage while maintaining anti-theft capability.
2Reliability
If a mechanic immobilizer is added, then anti-theft capability improves, but user convenience deteriorates
Solution Approach 1:
The patent replaces mechanical immobilizer systems with an electronic control system that uses motor reverse resistance for anti-theft. This eliminates the need for additional mechanical locks, maintaining strong anti-theft capability while improving user convenience by removing extra mechanical components and operations.
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
The method effectively increases the difficulty of stealing an electric vehicle by generating resistance or noise, while preventing motor damage by avoiding prolonged high-temperature conditions.
Implementation Method 1
the motor is reversed to generate a reverse resistance
Implementation Method 2
an asynchronous electronic angle is provided to the motor for enabling the motor to generate a vibration noise
Data Source
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Figure 2
AI summary
An anti-theft method for an electric vehicle is provided. The anti-theft method for an electric vehicle includes the following steps. An electronic anti-theft function is activated. Whether the electric vehicle is moving is determined. Whether the temperature of the motor is greater than a critical value is determined. When the temperature of the motor of the electric vehicle exceeds the critical value, the motor is reversed to generate a reverse resistance.