Compressed Air Supply System Venting Control
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Solution Overview
Problem
Compressed air supply systems for vehicles face challenges in achieving high pressure amplitude and rapid venting functionality while maintaining simplicity and avoiding residual pressures that can lead to unstable system operation and reduced regeneration behavior in air dryers.
Innovation Solution
A pressure-maintaining pneumatic device is connected to the control line, allowing for control pressure to be maintained independently of the vent line and main pneumatic line pressures, enabling high pressure changes and rapid ventilation without the need for a bellows pressure, and can be integrated into existing solenoid valve arrangements with modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If directly venting circuits with large nominal width vent valves are used to enable rapid venting, then venting speed is improved, but power consumption of solenoid coil increases and switching pressure differences are limited
Solution Approach 1:
A control valve is introduced as an intermediary component between the solenoid valve and the vent valve. The control valve amplifies the control effect of the solenoid valve, allowing a smaller solenoid valve (with lower power consumption) to effectively control a larger vent valve (for rapid venting). The control valve receives control pressure from the solenoid valve and uses it to actuate the vent valve, thereby mediating between the limited solenoid output and the required venting capability.
2Device complexity
If control pressure is taken from the main pneumatic line during venting, then system simplicity is maintained, but residual pressure remains in the system which reduces regeneration behavior of air dryers
Solution Approach 1:
The control line is segmented into two separate lines: a first control line connected to the main pneumatic line for supplying control pressure during normal operation, and a second control line connected to the vent line for maintaining control pressure during venting. This segmentation allows the system to achieve complete pressure release in the main line while maintaining necessary control pressure through the separate second control line, thereby enabling proper air dryer regeneration without compromising system simplicity.
3Ease of manufacture
If bellows pressure is used to provide control pressure for vent valve, then simple pressure source is available, but residual holding pressure prevents complete venting and causes unstable system states
Solution Approach 1:
Instead of directly using bellows pressure which creates residual holding pressure, the system copies the necessary control pressure function through a dedicated control line with a control valve. The control valve can be precisely controlled to maintain control pressure only when needed for vent valve actuation, while allowing complete pressure release when venting is complete. This copying approach replicates the pressure source function without the destabilizing residual pressure effect.
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 solution allows for improved venting functionality with high pressure amplitude and rapid ventilation, reducing the risk of unstable system states and enhancing the regeneration behavior of air dryers, while maintaining a simple and cost-effective design.
Implementation Method 1
A pressure-maintaining pneumatic device is connected to the control line, which is designed to keep the pressure control connection under control pressure when the vent valve connection of the vent valve is open in the vent line, independently of a pressure in the vent line and/or the main pneumatic line.
Implementation Method 2
a solenoid valve arrangement with a control valve for controlling a vent valve is provided
Implementation Method 3
An air dryer has a desiccant, usually a bed of granules through which the compressed air can flow, so that the bed of granules--at comparatively high pressure--can absorb moisture contained in the compressed air by absorption.
Implementation Method 4
An air dryer can optionally be designed as a regenerative air dryer. This can be done in that the dried compressed air from the air suspension system flows through the bulk granules in countercurrent or cocurrent relative to the filling direction during each venting cycle--at comparatively low pressure. To do this, the vent valve arrangement can be opened. For such an application, also referred to as pressure swing adsorption...
Data Source
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AI summary
The invention relates to a compressed air supply system for operating a pneumatic system, in particular an air suspension system of a motor vehicle, comprising: - a compressed air feed (1); - a compressed air connection (2) to the pneumatic system (90); - a ventilation connection (3) to the surroundings; - between the compressed air feed (1) and the compressed air connection (2) a pneumatic main conduit (60) comprising an air drier (61); - a ventilation conduit (70) between the compressed air connection (1) and the ventilation connection (3); - a magnetic valve arrangement (80) comprising a control valve (81) for controlling a ventilation valve (71), the control valve (81) being connected to a control valve connection (X2, Y2) in a pneumatic control conduit (110) that is connected to a pressure control connection (71S) of the ventilation valve (71), and the ventilation valve (71) being connected to a ventilation valve connection (X1, Y1) in the ventilation conduit (70). According to the invention, a pressure-maintaining pneumatic device (120) is connected to, in particular in, the pneumatic control conduit (110) and is designed to maintain the pressure control connection (71S) under control pressure when the ventilation valve connection (X1, Y1) of the ventilation valve (71) in the ventilation conduit (70) is open, independently of pressure in the ventilation conduit (70) and/or the pneumatic main conduit (60).