Fluid Supply System Valve Timing Control
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Solution Overview
Problem
Existing gas supply systems for fuel cells rely on detecting current changes to determine valve opening, which can lead to inefficient timing and wasteful operation, especially when the valve-open waiting time is not accurately set.
Innovation Solution
A fluid supply system with a pilot valve and main valve configuration, where pressure detectors and a controller calculate a pressure equalization time to set a valve-open waiting time, ensuring the second valve opens only when necessary, thereby optimizing the timing of fluid supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve-open waiting time is preset based on maximum opening time of the shutoff valve, then the on-off valve can be actuated in a short period, but this may cause wasteful operation when the actual opening time is shorter
Solution Approach 1:
The control unit detects the actual opening of the shutoff valve by monitoring current changes, and uses this feedback information to dynamically determine when to actuate the on-off valve, rather than using a fixed preset time. This eliminates wasteful operation while maintaining rapid response.
Solution Approach 2:
The valve-open waiting time is made dynamic rather than static. The control unit adjusts the timing of on-off valve actuation based on the actual opening status of the shutoff valve, allowing the system to adapt to varying opening times and avoid both waste and delays.
2Ease of operation
If the valve-open waiting time is always elapsed regardless of actual valve opening status, then the timing is simple to control, but this causes delayed response and reduced efficiency
Solution Approach 1:
The control unit continuously monitors the current status of the shutoff valve and uses this real-time feedback to determine the optimal timing for on-off valve actuation. This eliminates unnecessary delays while maintaining straightforward control logic.
Solution Approach 2:
The system automatically detects valve opening status through current monitoring and self-adjusts the timing of subsequent valve actuation, eliminating the need for complex external timing mechanisms or manual intervention.
3Device complexity
If current-based detection method is used to detect valve opening, then the detection is simple and direct, but this leads to inefficient timing calculation for the second valve
Solution Approach 1:
The control unit uses current detection feedback to determine shutoff valve opening status, and在此基础上 calculates the optimal timing for on-off valve actuation. This combines simple detection with intelligent timing control to improve overall efficiency.
Solution Approach 2:
The control unit prepares the timing for on-off valve actuation in advance based on detected valve opening status, ensuring optimal fluid supply timing without wasting time or resources on premature or delayed actuation.
Data Source
AI summary
A fluid supply system includes a fluid supply source, a first valve unit, a second valve unit, a first pressure detector, a second pressure detector, a third pressure detector, and a controller. If the pressure detected by the third pressure detector is less than a shutoff pressure at a timing of starting supply of fluid from the fluid supply source, the controller calculates a pressure equalization time from a timing at which opening of a pilot valve is completed to a timing at which a main valve starts closing, based on the pressures detected by the first pressure detector, the second pressure detector and the third pressure detector, sets a valve-open waiting time based on the pressure equalization time, and controls opening of the second valve unit upon elapse of the valve-open waiting time after controlling opening of the first valve unit.