Utility Vehicle Power Distribution With HV-LV Conversion and PTO Flexibility
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Solution Overview
Problem
Utility vehicles with electric drives face challenges in safely and efficiently providing power takeoff for work functions, as existing systems lack efficient energy management and flexibility in energy distribution, leading to potential hazards and inefficiencies.
Innovation Solution
A power distribution unit with an electric machine, high-voltage distributor, control device, inverters, and converters that connect to energy storage, external power sources, and vehicle systems, enabling safe and flexible energy management, including galvanic separation and standardized interfaces for various power takeoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power distribution unit with multiple components (high-voltage distributor, control device, inverters, converters) is implemented, then safety and energy management efficiency are improved, but device complexity increases
Solution Approach 1:
The power distribution unit is divided into functionally independent modules: high-voltage distributor for power routing, control device for monitoring and management, inverters for AC/DC conversion, and converters for voltage transformation. Each module performs a specific function, allowing independent optimization and fault isolation while maintaining overall system safety and reliability.
2Loss of energy
If efficient energy management and optimization are implemented through multiple conversion stages, then energy distribution efficiency is improved, but device complexity and component count increase
Solution Approach 1:
The high-voltage distributor acts as an intermediary component that centrally manages power distribution from the energy storage device to various consumers. It coordinates the operations of inverters and converters, optimizing energy routing and conversion sequences to minimize losses while avoiding the need for redundant conversion stages.
Solution Approach 2:
The control device dynamically adjusts the operation of inverters and converters based on real-time energy demands from different consumers. It optimizes conversion parameters, selects active power paths, and manages charging/discharging cycles adaptively, improving energy efficiency without requiring fixed complex conversion architectures for all scenarios.
3Adaptability or versatility
If standardized interfaces and galvanic separation are implemented, then adaptability and safety are improved, but device complexity increases
Solution Approach 1:
The power distribution unit employs standardized interfaces that can accommodate different types of energy storage devices, power consumers, and charging sources. The high-voltage distributor and control device are designed with universal connection protocols, allowing the same unit to serve multiple functions and different applications without requiring custom interface designs.
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 solution provides improved safety and usability by optimizing energy distribution, preventing overloads, reducing losses, and allowing flexible operation of power takeoffs, while enabling charging and peripheral power generation, thus enhancing the utility of energy storage and reducing component complexity.
Implementation Method 1
at least one inverter which is arranged in the current path between the high-voltage distributor and at least one of the contacts for the first output, the second output or the second input
Implementation Method 2
a first converter which is arranged between the high-voltage distributor and the third output and converts a DC voltage provided by the high-voltage distributor to a lower DC voltage
Data Source
AI summary
A power distribution includes first and second inputs, first and second outputs, and a third output configured to connect to a low-voltage vehicle power supply, a high-voltage distributor is connected to the first input and forms the connection between the energy storage and further components of the power distribution. A controller monitors at least the high-voltage distributor and can control components of the power distribution. At least one inverter is arranged in the current path between the high-voltage distributor and at least one of the contacts for the first output, the second output or the second input, a first converter is arranged between the high-voltage distributor and the third output and converts a DC voltage provided by the high-voltage distributor to a lower DC voltage.