Pressure Control Valve Frequency Monitoring for Overpressure Detection
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Solution Overview
Problem
Existing fuel supply systems for vehicles face challenges in reliably detecting overpressure conditions, particularly when the rail pressure sensor malfunctions, which can lead to system bursts due to undetected high pressures.
Innovation Solution
A method for operating a pressure control valve that utilizes frequency changes in control signals to indicate valve opening and closing states, allowing for detection of overpressure independent of the rail pressure sensor, by comparing frequencies in adjacent periods and adjusting current application to prevent system overpressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rail pressure sensor is used to monitor system pressure, then the system can detect pressure conditions, but the system becomes vulnerable to undetected overpressure when the sensor malfunctions
Solution Approach 1:
The pressure control valve monitors its own state through frequency detection of its control signal, eliminating the need for external sensor dependency. The valve detects its own opening/closing transitions by analyzing frequency changes in its drive signal, thereby self-verifying system pressure conditions.
Solution Approach 2:
The system implements feedback by continuously monitoring the frequency of the control signal applied to the pressure control valve. When the valve transitions between open and closed states, the frequency changes are detected and fed back to the control unit, which then determines overpressure conditions and activates failure reactions.
2Measurement precision
If the pressure control valve is used as an indicator for maximum system pressure, then overpressure can be detected, but the valve must be precisely calibrated to the maximum pressure threshold
Solution Approach 1:
The system uses frequency as a detectable parameter that changes when the valve transitions between states. Instead of requiring precise pressure calibration, the system monitors frequency changes in the control signal, which naturally indicate when the valve has opened due to pressure exceeding the threshold.
Solution Approach 2:
The patent replaces mechanical pressure measurement with electrical signal frequency analysis. Instead of mechanically measuring pressure to determine valve state, the system electronically monitors frequency changes in the control signal, simplifying the measurement process and eliminating the need for precise mechanical calibration.
3Reliability
If frequency detection is used to monitor valve state, then reliable overpressure detection is achieved, but additional detection mechanisms are required beyond the existing pressure sensor
Solution Approach 1:
The pressure control valve serves multiple functions: it controls pressure regulation, indicates maximum system pressure through frequency changes, and provides fail-safe monitoring independent of the pressure sensor. The same valve mechanism that regulates pressure also serves as the detection indicator for overpressure conditions.
Solution Approach 2:
The valve monitors its own operational state through frequency analysis of its control signal, eliminating the need for separate detection mechanisms. The valve itself becomes the sensor by utilizing its inherent mechanical-electrical coupling to generate detectable frequency changes when pressure thresholds are exceeded.
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
This approach enables reliable detection and prevention of overpressure conditions, even with faulty rail pressure sensors, through frequency-based monitoring and current control, thereby preventing system bursts and ensuring safe operation.
Implementation Method 1
The change in the frequency of the control signal results from a movement of an armature of the pressure control valve from a closed state to the open state. For example, the change in the frequency is due to the pole distance variation during opening and closing of the valve and the voltage induced due to the movement of the armature.
Data Source
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AI summary
A method for operating a pressure control valve (110) of a fluid supply system (100) for a vehicle comprises: - applying a control signal (120) for the valve (110) to hold the valve (110) in a closed state dependent on a given opening pressure for the valve (110), - detecting a first frequency (121) of the control signal (120) in a first period (124) of oscillation, - detecting a second frequency (122) of the control signal (120) in a second period (125) of oscillation, the second period (125) being adjacent to the first period (124), - comparing the first frequency (121) with the second frequency (122), - determining an opening of the valve (110), if the second frequency (122) is different from the first frequency (121).