Motor Controller Fault Isolation on a Distributed DC Bus
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Solution Overview
Problem
In dual-motor driven vehicles, a fault in one electric drive system can cause a main circuit fuse to fuse, disrupting power supply to other non-faulty systems, leading to safety risks and high maintenance costs.
Innovation Solution
A disconnection protection apparatus is integrated into the motor controller to quickly isolate faulty components, preventing fault spread and ensuring power continuity to non-faulty systems by disconnecting the motor controller from the direct current bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a main circuit fuse is disposed on the output side of the power battery to protect against short circuits, then vehicle safety is improved, but when a fault occurs in one electric drive system, the main circuit fuse fuses causing power supply loss to other non-faulty systems and high maintenance costs
Solution Approach 1:
The patent divides the high-voltage power distribution system into multiple independent branches, each protected by its own protection apparatus. Instead of a single main circuit fuse protecting all systems, separate protection devices are installed in each electric drive system branch, allowing independent fault isolation and maintaining power supply to non-faulty systems.
Solution Approach 2:
The patent introduces a disconnection protection apparatus as an intermediary component between the power battery and each electric drive system. This apparatus acts as a mediator that can quickly disconnect faulty systems from the high-voltage bus, preventing fault propagation while maintaining power supply to other systems.
2Reliability
If a disconnection protection apparatus is added to quickly isolate faulty components, then fault spread prevention is improved, but device complexity increases
Solution Approach 1:
The disconnection protection apparatus is designed as a multi-functional component that integrates several protection functions including overcurrent protection, short circuit protection, and rapid disconnection capability. By consolidating multiple protection functions into a single apparatus, the patent reduces overall system complexity while maintaining comprehensive fault isolation capabilities.
Data Source
AI summary
A motor controller, a distributed powertrain, and a vehicle. The motor controller is configured to receive electric power supplied by a power battery and output an alternating current to a drive motor to drive the drive motor. The motor controller is configured to receive, by using a disconnection protection apparatus, electric power supplied by a direct current bus, and the direct current bus is configured to receive, by using a first switch, electric power supplied by the power battery. When the motor controller is faulty, the disconnection protection apparatus is configured to disconnect the direct current bus from the motor controller. When the motor controller is faulty, the disconnection protection apparatus is disconnected, so that fault spreading can be prevented when the motor controller is faulty, and normal operating of another electric drive system can be ensured.