Compressed Air Supply System Differential Pressure Element
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Solution Overview
Problem
Existing compressed air supply systems for commercial vehicles require excessive equipment, specifically two pressure limiters, to generate multiple pressure levels for different brake circuits, which is inefficient.
Innovation Solution
A differential pressure element, such as a check valve, is used to reduce the inlet pressure to generate three pressure levels, replacing one pressure limiter and simplifying the system by creating a 'minus element' that lowers the air pressure by a specific value, allowing the highest pressure to be directly regulated without additional equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two pressure limiters are used to generate three different pressure levels for different brake circuits, then the required pressure levels are achieved, but the equipment complexity and cost increase
Solution Approach 1:
The patent extracts the pressure reduction function from the pressure limiter and implements it separately through a differential pressure element. This allows one pressure limiter to be eliminated while maintaining the capability to generate three different pressure levels, thereby reducing device complexity without sacrificing adaptability
Solution Approach 2:
The pressure control function is segmented into two independent components: a pressure limiter for generating the second pressure level from the first pressure level, and a differential pressure element for generating the third pressure level from the second pressure level. This segmentation allows each component to perform a specific function with simpler design, reducing overall system complexity
2Device complexity
If a differential pressure element is used to replace one pressure limiter, then the equipment complexity is reduced, but the precision of pressure control may be affected
Solution Approach 1:
The differential pressure element acts as an intermediary component between the second pressure level and the third pressure level. It provides a reliable pressure reduction function with defined dynamic pressure characteristics, ensuring precise pressure control for the trailer brake circuit while maintaining system simplicity
Solution Approach 2:
The differential pressure element is designed with specific parameter characteristics (defined dynamic pressure) that enable it to maintain precise pressure control. By optimizing these parameters, the element achieves accurate pressure reduction without requiring a full pressure limiter, thus reducing complexity while preserving control precision
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 reduces the complexity and equipment needed, enabling efficient generation of three pressure levels with a simpler structure, ensuring timely pressure supply to various brake circuits and reducing operational effort.
Implementation Method 1
The pressure drop across the differential pressure element corresponds to the difference between the second pressure level B and the third pressure level C
Implementation Method 2
a check valve, whose spring holding a valve member in the closed position is designed for the differential pressure
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a compressed air supply system for utility vehicles, comprising an air preparation unit for cleaning and providing compressed air at different levels of pressure in order to operate a plurality of brake circuits and/or auxiliary pressure circuits, a pressure limiter (19) being provided for reducing the input pressure, supplied via a compressed air input (17) and having a first pressure level A, to a desired second pressure level B, a differential pressure element (20) with defined dynamic pressure being provided for the purpose of reducing this input pressure to a third pressure level C, said element lowering the air pressure of the second pressure level B by a pressure value to produce a third pressure level C.