Multi-Drive Voltage Switching for Zero-Torque-Free Propulsion
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Solution Overview
Problem
Current multi-drive vehicle systems cannot simultaneously apply different levels of direct current (DC) voltage to different drive units during propulsion, requiring a no-drive or zero torque condition when transitioning between operating modes, and both drives typically operate at the same voltage for system efficiency or enhanced performance.
Innovation Solution
A system with independently operable switching devices connected to a battery system, allowing for varying voltage levels to be applied to multiple drive units, enabling operation during driving and concurrent operation at different voltages by selectively connecting battery assemblies in series or parallel, and using mechanical or solid-state switches to manage voltage states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage transitions between operating modes are implemented in current multi-drive systems, then operating mode changes can occur, but zero torque conditions are required during transitions
Solution Approach 1:
The system segments the multi-drive propulsion system into independently controllable drive units, each with its own switching device. This segmentation allows individual drive units to be controlled at different voltage levels simultaneously, enabling smooth voltage transitions without requiring zero torque conditions across the entire system.
Solution Approach 2:
The system implements dynamic voltage control by allowing different drive units to operate at different voltage levels concurrently during transitions. The switching devices can be operated independently to vary voltage to different drive units at different times, maintaining propulsion continuity while transitioning between operating modes.
2Use of energy by moving object
If all drive units operate at the same voltage for system efficiency, then system efficiency is improved, but the ability to apply different voltage levels to different drive units is lost
Solution Approach 1:
The system applies local quality by allowing different voltage levels to be applied to different drive units based on specific operational requirements. Each drive unit can receive the appropriate voltage level (high or low) independently, optimizing performance for each drive unit's specific needs while maintaining overall system efficiency.
Solution Approach 2:
The system implements parameter changes by varying the voltage level parameter for different drive units independently. The switching devices enable the voltage parameter to be changed for individual drive units without affecting others, allowing the system to adapt voltage levels dynamically based on propulsion requirements.
Data Source
AI summary
A system for controlling propulsion in a vehicle includes a switching system connected to a battery system and a propulsion system. The battery system includes a first battery assembly and a second battery assembly, the propulsion system includes a first drive unit and a second drive unit, and the switching system includes a first switching device configured to selectively connect the first drive unit to the battery system and a second switching device configured to selectively connect the second drive unit to the battery system. The first switching device and the second switching device are independently operable. The system also includes a controller configured to operate the switching system to vary a voltage applied to at least one of the first drive unit and the second drive unit during vehicle propulsion.