Vehicle Pressure Control Valve for Compressor Overload Limiting
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Solution Overview
Problem
Existing pressure control systems in vehicles, such as air spring systems, face overloading issues due to excessive charging volume flow or pressure, leading to increased power consumption and potential motor overload, particularly in closed operating modes where compressed air is reused.
Innovation Solution
A method involving a flow-control valve that adjusts the charging volume flow in a continuously variable manner based on admission pressure and volume flow, limiting the flow to prevent overloading by optimizing the flow-control cross-section, thereby ensuring the compressor operates below its power limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging volume flow is increased to improve productivity, then the compression speed increases, but the compressor becomes overloaded and power consumption increases excessively
Solution Approach 1:
The flow control cross-section is made dynamically adjustable rather than fixed. The control unit continuously adapts the flow control valve opening based on real-time compressor operating conditions (pressure, temperature, power consumption), allowing the system to optimize compression speed while preventing overload. This dynamic adjustment resolves the contradiction by enabling high productivity when the compressor can handle the load, and reducing flow when power limits are approached.
Solution Approach 2:
The system implements a feedback control mechanism where sensors monitor compressor operating parameters (power consumption, pressure, temperature) and feed this information back to the control unit. The control unit processes this feedback and adjusts the flow control valve accordingly, creating a closed-loop control system that automatically balances productivity and power consumption, preventing overload while maximizing compression speed within safe operating limits.
2Reliability
If a fixed flow control valve is used to limit charging volume flow, then the compressor is protected from overload, but the compression speed cannot be optimized under varying operating conditions
Solution Approach 1:
The flow control valve transitions from a fixed setting to a dynamically adjustable component. The control unit modifies the valve opening in real-time based on compressor operating conditions, ensuring reliable overload protection while simultaneously optimizing compression speed for current demands. This dynamic behavior allows the system to adapt to varying operating conditions rather than being constrained by a fixed flow limit.
Solution Approach 2:
The system changes the flow control parameter (valve opening degree) continuously based on operating conditions rather than maintaining a constant setting. By adjusting this parameter dynamically according to compressor power consumption, pressure, and temperature, the system achieves both reliable protection and optimized productivity across different operating scenarios.
3Device complexity
If the flow control cross-section is adjusted in discrete steps, then the control is simpler, but the optimization of compression speed is insufficient under varying operating conditions
Solution Approach 1:
The flow control system transitions from discrete step adjustments to continuous variable adjustment. The control unit can modify the valve opening degree smoothly across a continuous range, enabling fine-tuned optimization of compression speed for each specific operating condition. This continuous control provides superior productivity optimization compared to discrete steps, while the electronic control mechanism keeps the added complexity manageable.
Solution Approach 2:
The system replaces mechanical discrete-step flow control mechanisms with an electronically controlled continuous adjustment system. The electronic control unit provides precise, continuous modulation of the flow control valve, achieving superior optimization of compression speed while maintaining reasonable system complexity through the use of electronic rather than purely mechanical control.
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 effectively prevents overloading of the compressor, optimizing its operation by adjusting the compression volume flow and maintaining efficient power consumption within the compressor's limits, especially in closed operating modes.
Implementation Method 1
A method is proposed for operating a pressure control system in a vehicle, in particular an air spring system, wherein a flow-control valve (25a, 25b) in a charging line (23) is controlled in an admission pressure-dependent and/or admission volume flow-dependent manner, wherein a flow-control cross-section (DQ) or an average flow-control cross-section (DQ_avg) that acts on the charging pressure medium (A) which is flowing in via the charging line (23) is adjusted in a continuously variable manner in dependence upon an admission pressure (pV) and/or an admission volume flow (QV)
Data Source
AI summary
A method for operating a pressure control system in a vehicle includes controlling a flow-control valve in a charging line, which conveys a charging pressure medium, in dependence upon an admission pressure and/or upon an admission volume flow. The admission pressure and/or the admission volume flow characterizes a prevailing or currently to be expected loading of a pneumatic consumer of the pressure control system during the supply of the charging pressure medium with a charging volume flow and at a charging pressure into the pneumatic consumer. The method further includes adjusting a flow-control cross-section, which acts on the charging pressure medium as it flows through the flow-control valve, or adjusting an average flow-control cross-section so as to limit the charging volume flow to a limit volume flow. The method additionally includes outputting the volume-flow limited charging pressure medium to the pneumatic consumer.