Fuel Cell Compressor Noise Suppression via Speed Region Switching
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Solution Overview
Problem
Fuel cell systems experience noise and vibration issues due to compressor operation, particularly in specific rotational speed regions, which affect the performance and comfort of fuel cell vehicles.
Innovation Solution
Implementing a compressor control system that adjusts the command rotational speed to avoid the first rotational speed region where noise and vibration exceed predetermined values, by shifting to either a higher or lower second rotational speed region, and integrating power generation and battery management to compensate for power fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the compressor rotational speed is increased to meet higher power generation requirements, then the power generation capability is improved, but the noise and vibration exceed predetermined values in the first rotational speed region
Solution Approach 1:
The patent implements dynamic rotational speed region switching based on real-time operating conditions. The control system dynamically identifies whether the compressor is operating in the first or second rotational speed region and adjusts the command rotational speed accordingly, transitioning between different operational modes to avoid excessive noise and vibration while meeting power generation requirements
Solution Approach 2:
The patent changes the operational parameters by switching between two distinct rotational speed regions. When in the first rotational speed region, the system increases the command rotational speed to enter the second region where noise and vibration are within acceptable limits, effectively using parameter change to resolve the contradiction between power output and noise control
2Object-affected harmful factors
If the compressor rotational speed is decreased to reduce noise and vibration, then the noise and vibration are suppressed, but the power generation capability is reduced
Solution Approach 1:
The control system continuously monitors the actual rotational speed and compares it with the command rotational speed, then adjusts the command based on the identified rotational speed region. This feedback mechanism ensures that the compressor operates in the appropriate region to balance noise/vibration suppression with adequate power generation capability
3Object-affected harmful factors
If the command rotational speed is adjusted to avoid the first rotational speed region, then the noise and vibration are reduced to acceptable levels, but the control system complexity increases
Solution Approach 1:
The patent segments the rotational speed range into two distinct regions (first and second rotational speed regions) with different noise and vibration characteristics. By dividing the operational range and applying different control strategies to each segment, the system achieves noise suppression while maintaining manageable control complexity through clear regional boundaries
Data Source
AI summary
An object of the present invention is to provide a fuel cell system in which a noise and a vibration of a compressor can be suppressed. In order to achieve the above object, the present invention provides a fuel cell system including a fuel cell; a compressor for supplying an oxidant gas to the fuel cell, having a first rotational speed region within which as a rotational speed increases, a noise becomes greater than a predetermined value, and a second rotational speed region within which as the rotational speed increases, the noise becomes equal to or less than the predetermined value; and a compressor controller for controlling the compressor by calculating a command rotational speed for commanding the compressor based on a required amount of power generation.