Vehicle On-Board Network Segmentation for Loss Reduction
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Solution Overview
Problem
Existing on-board networks for motor vehicles experience significant electrical losses and safety concerns due to the continuous connection of energy-consuming devices and charging devices to the energy storage system, leading to unnecessary energy consumption and potential hazards during accidents.
Innovation Solution
The on-board network is divided into two separate electrical power sub-networks, with energy-consuming devices in one sub-network and charging devices in another, using two contactors to selectively connect and disconnect these sub-networks from the energy storage system, allowing for independent operation and disconnection to minimize energy losses and enhance safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If energy-consuming devices and charging devices are continuously connected to the energy storage system, then the system is simple to operate, but electrical losses increase and safety decreases
Solution Approach 1:
The electrical power network is divided into two separate sub-networks: a first sub-network for energy-consuming devices and a second sub-network for charging devices. Each sub-network is connected to the energy storage system through its own dedicated contactor, allowing independent control and disconnection to minimize electrical losses while maintaining system functionality.
2Reliability
If energy-consuming devices and charging devices are continuously connected to the energy storage system, then the system structure is simple, but safety during accidents deteriorates
Solution Approach 1:
The system is segmented into separate sub-networks with independent contactors, enabling selective disconnection of the energy storage system from either energy-consuming devices or charging devices during accident conditions, thereby enhancing safety through targeted isolation.
Solution Approach 2:
Two separate contactors act as intermediary switching devices between the energy storage system and the two sub-networks. These contactors enable controlled connection and disconnection, providing safety isolation while maintaining a relatively simple overall system structure.
3Productivity
If separate sub-networks with two contactors are used, then safety and energy efficiency improve, but device complexity increases
Solution Approach 1:
The electrical power network is segmented into two independently controllable sub-networks, each with its own contactor. This segmentation enables precise control over energy flow, allowing the system to disconnect non-essential loads and minimize electrical losses while maintaining manageable complexity through modular architecture.
Data Source
AI summary
An on-board network for a motor vehicle, having at least one energy storage system for the intermediate storage of electrical energy and an electrical power network, which has at least one energy-consuming device that can be operated with electrical energy from the energy storage system and at least one charging device for charging the energy storage system, wherein the energy storage system is electrically connected to the electrical power network by way of at least one contactor. In this case, it is provided that the energy-consuming device is present in a first electrical power sub-network of the electrical power network and the charging device is present in a second electrical power sub-network of the electrical power network.