Vehicle Pneumatic Air Bypass Valves for Pressure-Matched Compression
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Solution Overview
Problem
Existing pneumatic systems in vehicles waste energy due to compressors running at higher pressures than necessary, as they are regulated by fixed opening pressures of overflow valves, leading to inefficiencies.
Innovation Solution
A bifurcated flow passage system with a first and second valve that allows compressed air to bypass the second valve when pressure is lower than a threshold, enabling the compressor to operate at system pressure, and directs excess air to ambient environment when not needed, with optional filter regeneration modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an overflow valve with fixed opening pressure is used to maintain compressor outlet pressure, then the compressor can deliver compressed air to downstream components, but the compressor must run at a pressure higher than the system needs, leading to energy waste
Solution Approach 1:
The single overflow valve is segmented into two separate valves: a first overflow valve connected to the air tank and a second overflow valve connected to downstream components. This segmentation allows independent pressure control for different system parts, enabling the compressor to match its output pressure to actual system needs rather than forcing pressure through a fixed threshold valve.
Solution Approach 2:
The system transitions from a static fixed opening pressure valve to a dynamic pressure control system where the first overflow valve responds to air tank pressure and the second overflow valve responds to downstream component pressure. This dynamic response allows the compressor to operate at varying pressures matched to real-time system requirements, eliminating the energy waste of maintaining pressure above actual system needs.
2Productivity
If the compressor runs at higher pressure to overcome the overflow valve opening pressure, then compressed air can be delivered to the air tank and downstream components, but energy is wasted as compressed air must constantly force its way through the valve
Solution Approach 1:
By segmenting the air delivery path into two separate overflow valve circuits, the system allows compressed air to reach both the air tank and downstream components without needing to overcome a single high pressure threshold. Each valve operates at its appropriate pressure level, eliminating the energy waste of forcing air through a higher-pressure valve.
Solution Approach 2:
The first overflow valve acts as an intermediary between the compressor and the air tank, while the second overflow valve mediates between the compressor and downstream components. This intermediary structure allows pressure to be regulated at two different levels, enabling efficient air delivery to both destinations without the energy penalty of a single high-pressure valve.
3Device complexity
If a single overflow valve is used for both air tank and downstream components, then the system structure is simple, but the compressor cannot efficiently serve both purposes simultaneously
Solution Approach 1:
The single valve system is segmented into two separate overflow valves, each dedicated to a specific function: one for the air tank and one for downstream components. This segmentation improves compressed air distribution efficiency by allowing simultaneous, independent pressure regulation for both purposes, while the added complexity is minimal and justified by the functional benefits.
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 design prevents energy waste by matching compressor pressure to system needs, reduces filter saturation, and allows efficient thermal management, thereby optimizing energy use and system efficiency.
Implementation Method 1
an air compressor configured to provide air from an output of the air compressor for pressurizing the air tank
Implementation Method 2
the first valve is configured to control air flow from the output of the air compressor to the air tank
Implementation Method 3
the second valve is configured to change to, or remain in, said open state when the pressure of the air in said second branch is higher than a predetermined threshold
Data Source
Figure 1
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Figure 4
AI summary
A pneumatic system for a vehicle, comprising an air compressor for pressurizing an air tank. A flow passage extending from compressor is bifurcated to a first valve and to a second valve. The first valve has a first state preventing air from passing to the air tank, and has a second state allowing air to pass to the air tank. In a first mode of operation of the pneumatic system, the first vale is in said first state and the second valve controls air flow from the compressor to ambient environment. The second valve is configured to change to, or remain in, an open state when the pressure of the air upstream of the second valve is higher than a predetermined threshold, and to change to, or remain in, a closed state when the pressure of the air upstream of the second valve is lower than the predetermined threshold.