Air Suspension Pneumatic Circuit for Stable Pilot Pressure
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Solution Overview
Problem
In compressed air systems of vehicles with air ride suspension, sudden air pressure fluctuations during rapid lifting of the vehicle body can lead to unintended deactivation of system components and indifferent positions of pilot-controlled solenoid valves, particularly in systems without additional reservoirs, which complicates safe operation and increases system dimensions.
Innovation Solution
A pneumatic circuit configuration with pilot-controlled solenoid valves and a check valve in the pilot pressure line prevents pressure drops by connecting the first branch line to the pressure line via a pilot-controlled solenoid valve, ensuring continuous pilot pressure and avoiding indifferent valve positions, without the need for additional reservoirs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional reservoirs are integrated to compensate pressure drops in pilot pressure lines, then system reliability is improved, but system dimensions and complexity increase
Solution Approach 1:
A check valve is introduced as an intermediary component in the pilot pressure line to prevent backflow and maintain pilot pressure during rapid air spring filling. This mediator prevents the harmful effect of pressure drops without requiring large reservoirs, thus resolving the contradiction between reliability and system dimensions.
Solution Approach 2:
The pneumatic system is segmented into separate branches: a first branch line for air spring filling and a second branch line for pilot pressure supply. This segmentation isolates the pilot pressure line from the large air consumption of rapid filling operations, preventing pressure drops in the pilot line without requiring additional reservoirs.
2Productivity
If rapid lifting is performed by sudden filling of air springs, then productivity is improved, but pressure drops occur in the compressed air system
Solution Approach 1:
The system divides the pneumatic circuit into separate branch lines: one for rapid air spring filling and another for pilot pressure supply. This segmentation allows rapid filling operations without affecting pilot pressure, enabling fast lifting while preventing harmful pressure drops in the control line.
Solution Approach 2:
The check valve is pre-installed in the pilot pressure line to prevent backflow before pressure drops can occur. This preliminary protective measure ensures that pilot pressure is maintained even when rapid filling causes pressure fluctuations in other parts of the system.
3Measurement precision
If pressure sensors detect pressure drops during lifting operations, then measurement precision is improved, but false deactivation of system components occurs
Solution Approach 1:
By segmenting the pneumatic system into separate branch lines for filling and pilot pressure, pressure sensors in the pilot line only detect pressure variations relevant to valve control, not the large pressure drops from rapid filling. This eliminates false deactivation signals while maintaining precise pressure monitoring where needed.
Solution Approach 2:
The check valve acts as a mediator that isolates the pilot pressure line from pressure fluctuations caused by rapid filling. This prevents pressure sensors from detecting false pressure drops, thereby avoiding unnecessary deactivation of system components while maintaining reliable pressure monitoring.
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 configuration allows for safe and efficient rapid lifting of the vehicle body without unnecessary blocking or deactivation of secondary devices, maintaining system functionality and safety without increasing system complexity or cost, suitable for smaller vehicles.
Implementation Method 1
the second branch line is connected to the pressure line via a check valve, the check valve providing a block position against venting or pressure drop in the second branch line
Implementation Method 2
the first supply pipes for each air spring respectively include a pilot-controlled solenoid valve having a gate and a block position
Data Source
AI summary
Assembly in a compressed air system of a vehicle provided with an air ride suspension, the assembly being configured to lift the vehicle body by filling at least one air spring, the solenoid valves being switchable in cooperation with an electronic control device, and the assembly including a pressure line for filling the air springs, and the pressure line including a first branch line connectable to the pressure line via a pilot-controlled solenoid valve for filling the air springs and including first supply pipes and pilot-controlled solenoid valves for each air spring as well as a second branch line for providing a control pressure which includes second supply pipes for the pilot-controlled solenoid valves, wherein the second branch line is connected to the pressure line via a check valve, the check valve providing a block position against venting or pressure drop in the second branch line.