Brushless Motor Control Redundancy via Multiplexer Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Brushless fuel pumps in automotive applications face challenges with extended initialization times and potential microcontroller failures, which can suspend commutation functionality and affect reliable operation.
Innovation Solution
A system and method that utilize a primary control device and a secondary control device in conjunction with drive circuitry and a multiplexer, allowing for redundant control of a brushless fuel pump, ensuring continuous operation even if the primary control device fails, with the secondary control device having a shorter initialization time and being less expensive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primary control device is used to control the brushless fuel pump, then reliable commutation control is achieved, but extended initialization time affects the ability to achieve system level targets in the required timeframe
Solution Approach 1:
The system performs preliminary initialization using the secondary control device before the primary control device is fully ready. The secondary controller begins motor initialization routines early, and the multiplexer switches to the primary controller once it completes its initialization, thereby reducing overall initialization time while maintaining reliable commutation control.
2Productivity
If a secondary control device with shorter initialization time is used, then system level targets are achieved in required timeframe, but the primary control device must be replaced with a less expensive option
Solution Approach 1:
The control system is segmented into two distinct control devices with different functional roles. The secondary control device handles time-critical initialization functions with its faster response, while the primary control device handles normal operation. This segmentation allows each component to be optimized for its specific purpose, with the secondary device being smaller and less expensive while the primary device providing robust commutation control.
Data Source
AI summary
A system for controlling a brushless motor includes drive circuitry in communication with the brushless motor and a primary control device in communication with the drive circuitry. The system also includes a secondary control device in communication with the drive circuitry and a multiplexer for selectively providing an output of the primary control device or an output of the secondary control device to the drive circuitry, wherein the output of the primary control device is provided to the drive circuitry when the primary control device is operating normally.