High Voltage Traction System Arbitration Logic
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Solution Overview
Problem
Existing high voltage traction systems for vehicles face conflicts and inefficiencies between powertrain and vehicle power sub-systems, requiring improved characterization and coordination to manage power limits effectively, especially in limited power states.
Innovation Solution
A high voltage traction system comprising two independently controllable power sub-systems with separate arbitration logic and a master interface for communication exchange, allowing system-shared instructions to prioritize power distribution among secondary power consumers, enabling operation in limited states without a centralized master controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized master controller is used to coordinate power distribution between PPS and VPS, then power management coordination is improved, but device complexity increases
Solution Approach 1:
The system divides the centralized control function into distributed arbitration logic within each power subsystem (PPS and VPS). Each subsystem has its own master controller that independently arbitrates power requests, eliminating the need for a single centralized master controller while maintaining coordination through standardized communication interfaces.
Solution Approach 2:
A communication interface acts as an intermediary between the PPS and VPS master controllers, enabling coordinated power management without requiring direct integration or a centralized controller. The interface allows exchange of power status and arbitration decisions while preserving subsystem independence.
2Reliability
If power subsystems are integrated under centralized control, then system coordination is improved, but ease of manufacture deteriorates
Solution Approach 1:
The power system is segmented into independently manufacturable PPS and VPS modules, each with its own arbitration logic. This allows separate development, testing, and manufacturing of subsystems before final integration, significantly easing the manufacturing process while maintaining system coordination through standardized interfaces.
Solution Approach 2:
The master controllers in both PPS and VPS implement universal arbitration logic that can handle various power scenarios and configurations. This standardized multi-functional arbitration capability allows subsystems to be manufactured independently and then integrated without requiring custom coordination logic for each integration case.
3Productivity
If arbitration logic is unified across both power subsystems, then power distribution efficiency is improved, but adaptability deteriorates
Solution Approach 1:
Each power subsystem (PPS and VPS) has its own localized arbitration logic tailored to its specific power consumers and requirements. The PPS arbitration logic optimizes for powertrain needs while VPS arbitration logic optimizes for auxiliary equipment needs, allowing each subsystem to be optimized for its local requirements while maintaining overall system efficiency through the communication interface.
Solution Approach 2:
The arbitration logic in each subsystem is dynamic and can adapt to changing power requirements in real-time. Each master controller independently adjusts power distribution based on current system state, consumer priorities, and available power, allowing the system to adapt to various operating conditions without requiring a rigid unified arbitration scheme.
Data Source
AI summary
A high voltage traction system for a vehicle includes two independently controllable power sub-systems being a powertrain power sub-system, PPS, and a vehicle power sub-system, VPS. The PPS comprising a plurality of PPS secondary power consumers and a PPS master controller being configured to arbitrate power limits among the PPS secondary power consumers by a first arbitration logic, and the VPS comprising a plurality of VPS secondary power consumers and a VPS master controller being configured to arbitrate power limits among the VPS secondary power consumers by a second arbitration logic, different to the first arbitration logic. A master interface is between the PPS master controller and the VPS master controller enabling communication exchange between the PPS and VPS including system-shared instructions of prioritization of the PPS and VPS secondary power consumers limiting the first arbitration logic and/or the second arbitration logic in a limited state.