Governor Valve Pressure Control for Compressed Air Drying
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Solution Overview
Problem
Existing compressed air preparation devices for motor vehicles cannot maintain unrestricted operation after a failure of the electrical control energy, as the quality of compressed air preparation decreases rapidly due to the exhaustion of the drying device's water absorption capacity during emergency mode operation.
Innovation Solution
Incorporating a pressure-actuatable governor valve that continues to control the compressed air preparation device and regenerate the drying device during a failure of the electrical power supply, allowing the system to maintain operation by switching to a pressure-dependent control mode and ensuring continuous regeneration of the drying device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressed air preparation device operates in emergency mode after electrical control failure, then the system can maintain basic operation, but the drying device's water absorption capacity is exhausted rapidly causing quality degradation
Solution Approach 1:
The governor valve initiates periodic regeneration cycles of the drying device even in emergency mode. By cyclically reversing the airflow through the drying device, the system periodically restores the drying agent's water absorption capacity, preventing complete exhaustion and maintaining compressed air quality over extended operation periods.
Solution Approach 2:
The governor valve automatically controls the regeneration process without electrical input. The pressure-dependent operation of the governor valve enables it to self-regulate the regeneration cycles based on system pressure conditions, allowing the drying device to self-maintain its functionality during emergency operation.
2Reliability
If the system switches to pressure-dependent control mode during electrical failure, then the governor valve can maintain operation, but the control precision and response speed decrease
Solution Approach 1:
The system replaces the electrically actuated control valve with a mechanically actuated governor valve that operates based on pressure differential. This mechanical substitution enables continuous operation during electrical failure, though with reduced control precision compared to the electronically controlled system.
3Reliability
If the governor valve controls both compressed air feed and drying device regeneration, then the system maintains functionality without electrical power, but the device complexity increases
Solution Approach 1:
The governor valve is designed to perform multiple functions: controlling the compressed air feed to the system and regulating the regeneration cycles of the drying device. This multi-functionality reduces the need for separate control mechanisms during emergency operation, though it does increase the complexity of the governor valve itself.
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 the motor vehicle to continue its journey virtually unrestricted by ensuring the compressed air preparation device's functionality and drying agent regeneration even without electrical power, prolonging the system's operational effectiveness.
Implementation Method 1
the air moisture contained in the air condenses
Implementation Method 2
the drying device, which is required for air conditioning, removes the moisture by condensation and adsorption from the compressed air
Implementation Method 3
a membrane (diaphragm) 30 in a governor valve 19, which is acted upon by a pressure differential
Data Source
AI summary
For a motor vehicle, a compressed air preparation device includes a pressure line configured to conduct compressed air, a drying device disposed in the pressure line, a governor valve coupled to the drying device, and an electrically actuatable solenoid valve, the governor valve being (i) pilot controllable by the solenoid valve at a high pressure level to allow the compressed air to be fed through the pressure line when the solenoid valve is actuated and (ii) configured to control regeneration of the drying device in response to a low pressure level from the solenoid valve when an electrical supply to the solenoid valve fails.