Two-Stroke Engine Cycle Without Compression for High Expansion
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Solution Overview
Problem
Existing internal combustion engines are limited by the use of a compression process, which imposes mechanical and thermal design constraints, limiting compression and expansion ratios and overall efficiency, and are inefficient in energy conversion from renewable sources.
Innovation Solution
A two-stroke internal combustion engine that operates without a compression process, utilizing high-pressure fuel and oxidant supplied from external reservoirs, optimizing design for high expansion ratios and efficiency through crank ignition angle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compression process is used in internal combustion engines, then volumetric expansion ratio is increased, but mechanical and thermal design constraints are imposed
Solution Approach 1:
The patent removes the compression process from the engine operating cycle, extracting this function from the traditional four-stroke cycle. The engine operates with a simplified two-stroke cycle where fuel and oxidant are introduced at atmospheric pressure, eliminating the need for compression mechanisms and reducing thermal loading on components.
Solution Approach 2:
The patent segments the engine operation into distinct phases: intake of fuel and oxidant at atmospheric pressure, combustion, and exhaust. By separating the compression function from the power generation function, the engine achieves high expansion ratios without the mechanical constraints of traditional compression systems.
2Productivity
If compression ratio is increased to improve efficiency, then engine efficiency is improved, but mechanical and thermal design constraints are intensified
Solution Approach 1:
The compression process is extracted from the engine cycle, allowing the engine to operate with fuel and oxidant at atmospheric pressure. This eliminates the need for high-strength materials and advanced thermal management systems while maintaining high efficiency through optimized combustion and expansion.
Solution Approach 2:
The patent changes the pressure parameter of fuel and oxidant introduction from high compression pressures to atmospheric pressure. This parameter change fundamentally alters the operating conditions, allowing high expansion ratios to be achieved without intensive mechanical or thermal design constraints.
3Adaptability or versatility
If traditional ESR processes are used for energy conversion, then renewable energy can be stored and converted, but overall inefficiency and high energy losses occur
Solution Approach 1:
The patent changes the operating parameters of the heat engine by introducing fuel and oxidant at atmospheric pressure rather than compressed states. This parameter change reduces thermal losses and improves overall efficiency in the electrolysis-storage-reconversion process, making renewable energy conversion more economically viable.
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
Achieves high efficiency, high torque, low thermal loading, and reduced noise and vibration by eliminating the need for compression, allowing independent selection of expansion ratios and efficient energy conversion.
Implementation Method 1
the electrolysis of water
Implementation Method 2
combustion of the fuel in a heat engine
Data Source
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AI summary
A two-stroke internal combustion engine achieves high performance levels by using an innovatively timed sequence of injecting and igniting fuel and oxidant. The operating cycle of the engine does not utilize a compression process. This permits the injection of fuel and oxidant to be coordinated with the initiation of the combustion process in such a way that the engine achieves high efficiency and provides high torque, while at the same time producing low thermal loading of engine components and low levels of engine noise and vibration.