EV Towing Coupling Mechanism to Prevent Motor Back-EMF
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Solution Overview
Problem
Existing methods for preventing power generation in electric vehicles during towing either complicate the transmission structure or do not effectively prevent back electromotive force, potentially damaging high voltage components.
Innovation Solution
A mechanism involving a rod-shaped coupling member and a switcher that decouples the axle and decelerator during towing, preventing rotation transmission to the electric motor, using a linkage mechanism to ensure simultaneous switching of all wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric motor is directly coupled to the wheels, then the electric vehicle can achieve efficient power transmission during normal operation, but the electric motor generates back electromotive force during towing which may damage high voltage components
Solution Approach 1:
The patent extracts the harmful power transmission path by providing a detachable coupling member that can be removed from the power transmission shaft. When the coupling member is removed, the connection between the electric motor and wheels is broken, preventing back electromotive force from reaching the electric motor during towing operations, while maintaining efficient power transmission during normal operation
Solution Approach 2:
The patent implements a dynamic coupling system where the coupling member can be inserted or removed based on operational mode. The coupling member includes engagement protrusions that can be engaged or disengaged from corresponding recesses, allowing the system to transition between connected state (normal operation) and disconnected state (towing operation) to adapt to different operational requirements
2Object-affected harmful factors
If a clutch is added to the transmission to prevent power generation during towing, then back electromotive force can be prevented, but the transmission structure becomes more complex
Solution Approach 1:
The patent uses a simple detachable coupling member instead of a complex clutch mechanism. The coupling member is a basic mechanical component with engagement protrusions that can be quickly inserted or removed, providing effective back electromotive force prevention without adding complex control systems or multiple moving parts to the transmission structure
Solution Approach 2:
The patent segments the power transmission system into separable components: the electric motor, the coupling member, the power transmission shaft, and the wheels. This segmentation allows the coupling member to be independently removed to prevent power transmission during towing, avoiding the need for integrated complex clutch mechanisms while maintaining structural simplicity
3Object-affected harmful factors
If drive wheels are lifted during towing, then power generation can be prevented, but the towing operation becomes more complex and time-consuming
Solution Approach 1:
The patent implements preliminary action by providing a coupling member that can be pre-installed or pre-removed based on the intended operation. For towing operations, the coupling member is removed before towing begins, ensuring that back electromotive force prevention is already in place without requiring wheel lifting or complex operational procedures during the actual towing process
Data Source
AI summary
A mechanism for preventing power generation during towing of an electric vehicle. The mechanism includes: a rod-shaped coupling member receiver into which a rod-shaped coupling member to be used during the towing is configured to be inserted on a front portion or a rear portion of the electric vehicle, and to which the inserted rod-shaped coupling member is configured to be locked; and a switcher that is provided between the axle and the decelerator, and that is configured to bring the axle and the decelerator into a decoupled state in an inserting operation of inserting the rod-shaped coupling member into the rod-shaped coupling member receiver, and to bring the axle and the decelerator into a coupled state in a removing operation of removing the rod-shaped coupling member from the rod-shaped coupling member receiver.