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, which keeps the pressure control connection under control pressure independently of the vent line and main pneumatic line pressures, eliminating the need for residual bellows pressure and allowing for variable control pressure settings, enabling venting down to ambient pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a solenoid valve arrangement with a control valve is used to enable rapid venting, then venting speed is improved, but residual pressure remains in the system leading to unstable operation and reduced regeneration behavior
Solution Approach 1:
The invention extracts the control pressure function from the main pneumatic line by introducing a separate control line connected to a pressure source. This allows the control pressure to be maintained independently in the control line even when the main line is vented to ambient pressure, enabling complete venting without residual pressure that would cause instability.
Solution Approach 2:
The invention introduces a control line as an intermediary between the pressure source and the control valve. This control line acts as a mediator that maintains control pressure independently of the main pneumatic line pressure, allowing the control valve to function properly even when the main line is fully vented.
2Productivity
If the vent valve nominal width is increased to enable rapid venting, then venting capability is improved, but solenoid coil power consumption increases
Solution Approach 1:
The invention replaces the direct mechanical relationship between solenoid coil and vent valve with a pneumatic control system. The solenoid coil now only needs to control a small control valve that regulates control pressure, rather than directly actuating a large vent valve. This substitution allows the vent valve to have a large nominal width for rapid venting while the solenoid coil consumes minimal power.
3Device complexity
If control pressure is dependent on bellows pressure, then system simplicity is maintained, but venting pressure amplitude is limited and rapid venting cannot be achieved
Solution Approach 1:
The invention segments the pressure control function from the main pneumatic system by creating a separate control line with its own pressure source. This segmentation allows the control pressure to be independently optimized for rapid venting while the main pneumatic line handles the bulk air flow, resolving the contradiction between simplicity and pressure amplitude.
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 enhances the venting functionality with high pressure amplitude and rapid venting capabilities, improving the reliability and flexibility of the compressed air supply system while maintaining a simple solenoid valve arrangement and reducing the risk of partial valve closure and instability.
Implementation Method 1
A pressure-maintaining pneumatic device is connected to the control line, which keeps the pressure control connection under control pressure independently of the vent line and main pneumatic line pressures
Implementation Method 2
a solenoid valve arrangement with a control valve for controlling a vent valve
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
The compressed air supply system can be vented to the environment via a solenoid valve arrangement forming a vent valve arrangement by releasing air in one or more vent connections
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; a pneumatic main conduit (60), which has an air drier (61) between the compressed air feed (1) and the compressed air connection (2); 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, 81', 82") for controlling a ventilation valve (71), the control valve (81, 81', 82") 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 the, 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).