Pneumatic Piston Retrofit for Internal Combustion Engines
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Solution Overview
Problem
Existing compressed air machines have limited efficiency and inflexible control of compressed air, making them inefficient and difficult to retrofit into existing internal combustion engines.
Innovation Solution
A pneumatic cylinder with a pneumatic piston is integrated above the piston, connected via a force transmission element, allowing for easy regulation of compressed air and efficient power transmission, and featuring a control valve system with a switching device and Hall sensor for precise control and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a piston controls a control valve located in a cylinder head to move compressed air, then the machine can be driven by compressed air, but the efficiency is very limited and control of compressed air is inflexible
Solution Approach 1:
The control system is segmented into multiple independent control valves (first control valve for intake, second control valve for exhaust) that can be controlled separately. This allows independent optimization of air intake and exhaust processes, improving overall efficiency and control flexibility compared to a single control valve system.
Solution Approach 2:
The control valves are made dynamically controllable through a control unit that receives signals from a Hall sensor detecting piston position. The valves can switch between open and closed states based on real-time piston position, enabling dynamic optimization of compressed air flow throughout the stroke, thereby improving efficiency and control flexibility.
2Power
If air within the cylinder is compressed when moving from bottom dead center to top dead center, then the piston can be moved back towards top dead center, but the efficiency is very limited
Solution Approach 1:
Compressed air is supplied to the cylinder before the piston reaches top dead center, and the first control valve closes before the piston begins its return stroke. This preliminary action ensures that air compression is completed efficiently before the power stroke, maximizing power output while minimizing energy loss from prolonged compression.
Solution Approach 2:
The system maintains continuous useful action by ensuring compressed air is always available to drive the piston when needed, and the control valves are positioned to optimize air flow throughout the entire stroke. This eliminates idle compression phases and ensures every phase of the piston stroke contributes to useful work, improving overall efficiency.
3Ease of manufacture
If existing internal combustion engines are converted to drive with compressed air, then the machine can utilize existing engine components, but the conversion is complex and efficiency is limited
Solution Approach 1:
The control system uses universal components that can be integrated with existing internal combustion engine structures. The control valves are mounted on the cylinder head, and the Hall sensor can detect piston position in standard engine configurations. This universality allows easy retrofitting of compressed air drive into existing engines while maintaining high efficiency through optimized control.
Solution Approach 2:
The Hall sensor acts as an intermediary that detects piston position and converts this mechanical information into electrical signals for the control unit. This intermediary enables precise control of the valves based on actual piston position, improving efficiency while keeping the control system simple enough for easy retrofitting into existing engines.
4Measurement precision
If a control valve is controlled based on piston position detected by a Hall sensor, then precise control of compressed air is achieved, but the device complexity increases
Solution Approach 1:
The mechanical piston position detection system is replaced with a Hall sensor-based electromagnetic detection system. The Hall sensor non-contactly measures piston position through magnetic field changes, providing precise measurement without mechanical complexity. This substitution improves measurement precision while keeping the overall control system relatively simple.
Solution Approach 2:
The Hall sensor provides continuous feedback on piston position to the control unit, which adjusts the control valves in real-time based on this feedback. This feedback mechanism achieves precise control of compressed air flow synchronized with piston position, improving efficiency while the automated feedback loop simplifies the control logic compared to mechanical linkages.
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 enhances the efficiency of the machine, allows easy retrofitting of internal combustion engines, and enables precise control of the compressed air drive, reducing the need for additional cooling and improving air usage, especially in partial load conditions.
Implementation Method 1
a Hall sensor (16) arranged in front of the rotary body (14)
Implementation Method 2
a pneumatic cylinder (8) which can be pressurized with compressed air
Implementation Method 3
the pneumatic piston (9) is connected to the piston (5) via a force transmission element (10)
Implementation Method 4
The compressed air flowing into the pneumatic cylinder can be easily regulated using a control valve (13)
Data Source
Figure 1~2
AI summary
A machine (2) driven by compressed air has a pneumatic cylinder (8) that can be pressurized with compressed air and has a pneumatic piston (9) arranged therein. The pneumatic piston (9) is connected via a force transmission element (10) to a piston (5) guided in a cylinder (6) and connected to a crankshaft (3). This allows parts of existing internal combustion engines to be used and tensile forces to be transmitted to the piston (5).