Plugged Filter Detection Valve Pressure Differential Switch
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Solution Overview
Problem
Current filter replacement practices in automotive vehicles lack an accurate method to determine when filters are plugged, leading to either premature or delayed replacement.
Innovation Solution
A plugged filter detection system featuring a valve within a cavity that moves based on inlet and outlet pressures, activating a switch when the pressure difference exceeds a spring constant, indicating a plugged filter, and providing diagnostic capabilities through interaction with a vehicle lockup clutch and pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filter replacement is based on fixed schedules or estimates, then consumers may replace filters too often or wait too long, but there is no accurate way to measure when a filter should be replaced
Solution Approach 1:
The patent replaces mechanical measurement methods with a electrical sensing system. A pressure differential sensor electrically measures the pressure difference across the filter, converting a mechanical physical quantity (pressure differential) into an electrical signal for accurate measurement and processing, thereby achieving precise detection of filter clogging status
Solution Approach 2:
The patent introduces a pressure differential sensor as an intermediary device between the filter and the monitoring system. This sensor indirectly measures the filter's clogging status by detecting the pressure differential across it, providing accurate information without requiring direct contact with or disassembly of the filter
2Measurement precision
If a pressure differential sensor is used to detect filter plugging, then accurate detection is achieved, but the system complexity increases
Solution Approach 1:
The patent combines the pressure differential sensor, switch, and alarm notification system into an integrated detection device. By merging these components into a single unified system, the patent reduces overall system complexity while maintaining accurate detection capabilities, avoiding the need for separate independent systems
Solution Approach 2:
The patent designs the detection system to be self-activating. When the pressure differential exceeds the preset threshold, the switch automatically activates the alarm notification without requiring external intervention or complex control logic, simplifying the system operation and reducing complexity
3Reliability
If the valve moves to the second position to activate the switch, then plugged filter detection is achieved, but the valve must overcome spring force requiring inlet pressure greater than outlet pressure by at least the spring constant
Solution Approach 1:
The patent uses a spring to provide a counteracting force against the inlet pressure. This spring force acts as a threshold mechanism, requiring the inlet pressure to exceed the outlet pressure by at least the spring constant for the valve to move and activate the switch, thereby preventing false alarms from minor pressure fluctuations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate detection of plugged filters, reducing unnecessary replacements and ensuring timely maintenance, while also offering diagnostic insights into system functionality.
Implementation Method 1
The system further includes a spring having a spring constant. The spring biases the valve in the second direction, such that the inlet pressure must be greater than the outlet pressure by at least the spring constant for the valve to move from the first position to the second position.
Implementation Method 2
The valve may create a hysteresis effect within the cavity, such that movement of the valve partially toward the second position causes the valve to complete movement to the second position. As such, the hysteresis effect provides stability within the system.
Data Source
AI summary
A plugged filter detection system includes a valve housed within a cavity defining an initial inlet for receiving fluid at an inlet pressure before fluid enters a filter, a final inlet for receiving fluid at an outlet pressure after the fluid exits the filter, and a switch port for directing fluid to a switch to activate the switch. The inlet pressure biases the valve in a first direction and the outlet pressure biases the valve in a second direction substantially opposing the first direction. The valve is movable from a first position to a second position to unblock the switch port, thereby allowing the switch to be activated when inlet pressure is greater than outlet pressure. A spring preferably biases the valve in the second direction, such that inlet pressure must be greater than outlet pressure by at least the spring constant to allow switch activation.