EV PTO-Traction Switching for External Power and EMC Isolation
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Solution Overview
Problem
In at least partly electrically operated vehicles, there is a need to manage the disengagement and engagement between the Power Take Off (PTO) system and the traction system effectively to reduce complexity, weight, and potential electromagnetic compatibility (EMC) issues, while ensuring safe and efficient power distribution to external loads.
Innovation Solution
A system and method that adaptively engage and disengage the PTO system and traction system based on the vehicle's mode of operation, using a control device to manage switches and electric machines with multiple winding coils, allowing the traction system to function as a galvanic insulator and provide power to external loads when the vehicle is in stop mode, and prioritize traction when in driving mode, thereby reducing component count and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate PTO system is added to provide power to external loads, then the vehicle can power external equipment, but the system complexity increases
Solution Approach 1:
The traction system is designed to perform dual functions: providing traction power during vehicle operation and serving as a PTO system for powering external loads when the vehicle is stationary. The electric machine can operate in both motor mode (traction) and generator mode (PTO), eliminating the need for a separate PTO system and reducing overall system complexity
Solution Approach 2:
The patent combines the traction system and PTO system into a single integrated system. The electric machine, power electronics, and control systems are shared between traction and PTO functions, with switching mechanisms that enable the same hardware to serve both purposes depending on vehicle operating state
2Adaptability or versatility
If a separate PTO system is added to provide power to external loads, then the vehicle can power external equipment, but the weight of the vehicle increases
Solution Approach 1:
The traction system is designed to perform dual functions: providing traction power during vehicle operation and serving as a PTO system for powering external loads when the vehicle is stationary. The electric machine can operate in both motor mode (traction) and generator mode (PTO), eliminating the need for a separate PTO system and reducing overall system complexity
Solution Approach 2:
The patent combines the traction system and PTO system into a single integrated system. The electric machine, power electronics, and control systems are shared between traction and PTO functions, with switching mechanisms that enable the same hardware to serve both purposes depending on vehicle operating state
3Adaptability or versatility
If the PTO system and traction system are always connected, then power can be provided to external loads, but unintended power provision and EMC issues occur during driving
Solution Approach 1:
The system uses dynamic switching based on vehicle operating state. A control system monitors whether the vehicle is in motion or stationary and automatically switches the configuration of the electric machine and power electronics accordingly. During driving, the system prevents PTO power provision; during stationary operation, it enables PTO functionality, thereby avoiding EMC issues and unintended power provision while maintaining adaptability
Solution Approach 2:
The control system acts as an intermediary that manages the engagement and disengagement between the traction system and PTO system. It uses switching devices (such as contactors or semiconductor switches) to control the electrical connection between the electric machine and the PTO output, ensuring that power is only provided to external loads when appropriate and preventing EMC interference during vehicle operation
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
This approach reduces system complexity, weight, and EMC issues, while ensuring safe and efficient power distribution to external loads by reusing the traction system for additional functionality, minimizing unintended power provision during driving, and enhancing safety by using the electric machine as a galvanic insulator when the vehicle is stationary.
Implementation Method 1
the at least one electric machine may be adapted to function as a galvanic insulator in the system
Data Source
AI summary
A system for handling disengagement and engagement between a PTO system and a traction system in an at least partly electrically operated vehicle. The system is adapted to disengage the PTO system and the traction system from each other when the at least partly electrically operated vehicle is in driving mode. The system is adapted to engage the PTO system and the traction system to each other and thereby providing electrical power from the system to at least one external load when the at least one electrically operated vehicle is in stop mode.