Internal Combustion Engine Three-Stage Compression System
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Solution Overview
Problem
Internal combustion engines, particularly in heavy vehicles, face challenges in achieving increased power efficiency and reducing costs while meeting stringent exhaust gas pollution regulations and minimizing fuel consumption and noise levels.
Innovation Solution
The engine design incorporates a three-stage compression system with two-stroke compression cylinders and four-stroke combustion cylinders, featuring an intermediate compression cylinder that reduces total compression work and pressure demands on components, along with two-stroke expansion cylinders for improved thermodynamic efficiency and balanced motion patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional single-stage compression system is used, then the engine structure is simple, but the power efficiency is low and fuel consumption is high
Solution Approach 1:
The compression system is divided into multiple stages: a two-stroke compression cylinder performing initial compression, an intermediate two-stroke compression cylinder performing further compression, and a four-stroke combustion cylinder performing final compression and combustion. This multi-stage segmentation reduces the compression work required at each stage compared to single-stage compression, thereby improving fuel efficiency while distributing system complexity across modular components
2Speed
If a two-stroke compression cylinder is used, then the compression speed is high, but the pressure on the compression piston is excessive
Solution Approach 1:
The compression process is segmented into two distinct stages: the two-stroke compression cylinder performs rapid initial compression to build pressure quickly, then the intermediate two-stroke compression cylinder continues compression at a more manageable pressure level. This segmentation allows the system to achieve high overall compression speed while distributing pressure demands across multiple pistons, preventing any single piston from experiencing excessive stress
3Use of energy by moving object
If an intermediate compression cylinder is added, then the total compression work is reduced, but the number of components increases
Solution Approach 1:
The compression work is segmented across three cylinders operating in sequence, with each cylinder handling a portion of the total compression task. The intermediate compression cylinder specifically reduces the work burden by performing compression at intermediate pressure levels, allowing the other cylinders to operate more efficiently. This segmentation reduces total compression work while the modular nature of the segmented system allows for manageable complexity through standardized component design
4Use of energy by moving object
If the second crank shaft rotates at twice the speed of the first crank shaft, then the power efficiency is improved, but the mechanical stress on the transmission system increases
Solution Approach 1:
The system employs periodic action through the coordinated rotation of two crank shafts at different speeds (first crank shaft at baseline speed, second crank shaft at twice the speed). This periodic rotational relationship allows the intermediate compression cylinder to receive compressed gas at optimal intervals from the first compression cylinder while delivering to the combustion cylinder at the higher speed required for improved power efficiency. The periodic synchronization minimizes mechanical stress by maintaining consistent timing relationships rather than requiring continuous high-stress transmission
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 enhances power efficiency, reduces overall compression work, and lowers individual pressure on components, leading to improved engine performance, cost-effectiveness, and balanced operation, while meeting regulatory standards for exhaust emissions.
Implementation Method 1
the compression piston compresses gas inside the compression cylinder
Implementation Method 2
When the combustion piston thereafter is travelling upwards toward a top dead centre of the combustion cylinder, the gases in the combustion cylinder are compressed
Implementation Method 3
the gases in the combustion cylinder are compressed and ignited at a desired point in time
Implementation Method 4
the first two-stroke expansion cylinder being configured to receive exhaust gas from the first four-stroke combustion cylinder
Data Source
AI summary
An internal combustion engine including a first set of cylinders includes: a first two-stroke compression cylinder housing a first compression piston connected to a first crank shaft; an intermediate two-stroke compression cylinder housing an intermediate compression piston, wherein the second two-stroke compression cylinder is configured to receive compressed gas from the first two-stroke compression cylinder; and a first four-stroke combustion cylinder housing a first combustion piston, wherein the first four-stroke combustion cylinder is configured to receive compressed gas from the intermediate two-stroke compression cylinder; wherein the internal combustion engine further includes a second set of cylinders including: a second two-stroke compression cylinder housing a second compression piston connected to the first crank shaft, wherein the second two-stroke compression cylinder is configured to provide compressed gas to the intermediate two-stroke compression cylinder; and a second four-stroke combustion cylinder housing a second combustion piston, wherein the second four-stroke combustion cylinder is configured to receive compressed gas from the intermediate two-stroke compression cylinder; wherein each one of the intermediate compression piston and the first and second combustion pistons are connected to a second crank shaft, the second crank shaft being configured to rotate with a speed of at least twice the speed of the first crank shaft.