Two-Stroke Combustion Blend Control Using Hot and Cold Compressed Air
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Solution Overview
Problem
Existing internal combustion engines face challenges in meeting environmental standards due to inefficiencies and increased weight from larger particulate filters and chemical catalysts, and operate unreliably at low RPM and low load.
Innovation Solution
A process involving high compression of air by an auxiliary compressor, accumulation in a reservoir, and controlled injection into a two-stroke cycle engine to achieve a predetermined state for combustion, optimizing energy efficiency and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If larger particulate filters and chemical catalysts are equipped to meet environmental standards, then emissions are reduced, but efficiency is lost and weight increases
Solution Approach 1:
The patent recovers waste heat from exhaust gases through a heat exchanger to preheat the air charge before combustion. This converts the harmful waste heat into useful thermal energy, improving combustion efficiency and reducing the need for additional emissions control equipment, thereby addressing both emissions and energy efficiency simultaneously
Solution Approach 2:
The patent implements variable compression ratio and adjustable valve timing to optimize combustion parameters across different operating conditions. By dynamically adjusting these parameters, the engine achieves efficient combustion that reduces emissions without requiring larger filters or catalysts, thus maintaining energy efficiency while meeting environmental standards
2Object-generated harmful factors
If larger particulate filters and chemical catalysts are equipped to meet environmental standards, then emissions are reduced, but weight increases
Solution Approach 1:
By recovering waste heat from exhaust gases to preheat the air charge, the patent improves combustion efficiency and reduces emissions without adding heavy emissions control equipment. This approach reduces the need for large particulate filters and chemical catalysts, thereby avoiding the weight penalty while still meeting environmental standards
Solution Approach 2:
The engine system uses its own exhaust heat to preheat the incoming air charge through a heat exchanger. This self-service approach improves combustion efficiency and reduces emissions without requiring external heavy equipment, thus avoiding weight increase while meeting environmental requirements
3Device complexity
If compression is carried out by the piston, then the engine structure is simple, but energy necessary for compression is high
Solution Approach 1:
The patent preheats the air charge using waste heat from exhaust gases before compression and combustion. This preliminary heating reduces the work required for compression and improves overall thermodynamic efficiency, allowing the engine to maintain simple piston-based compression while reducing energy consumption
Solution Approach 2:
The patent implements variable compression ratio capability that allows the engine to optimize compression parameters for different operating conditions. By adjusting the compression ratio dynamically, the engine achieves efficient compression with reduced energy consumption while maintaining the basic piston-based compression structure
4Use of energy by moving object
If the engine operates at low RPM and low load, then fuel efficiency is improved, but reliability decreases
Solution Approach 1:
The patent implements variable valve timing and adjustable compression ratio that optimize combustion parameters across the entire operating range. These parameter adjustments ensure stable and reliable combustion even at low RPM and low load conditions, allowing the engine to achieve improved fuel efficiency without sacrificing reliability
Solution Approach 2:
The patent employs dynamically adjustable valve timing and compression ratio that adapt to different operating conditions. This dynamic capability ensures stable combustion and reliable operation across all RPM and load ranges, enabling the engine to operate efficiently at low RPM and low load while maintaining reliability
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
Improves energy efficiency and reduces polluting emissions by converting heat energy into mechanical power, minimizing compression energy, and optimizing gaseous blend conditions for homogeneous-charge compression-ignition, regardless of load.
Implementation Method 1
Having a heat exchanger to heat up the compressed air from the burnt exhaust gases
Implementation Method 2
Highly compressing the air via an auxiliary compressor. Accumulating compressed air at a relatively cold temperature in the reservoir
Implementation Method 3
controlling a gaseous blend to be combusted in a combustion chamber
Data Source
AI summary
A process relating to a two-stroke cycle internal combustion engine to control the pressure and/or the temperature of the gaseous blend inside the combustion chamber at the time of ignition of combustion, while the air/fuel mixture is maintained close to the stoichiometric ratio. The process is mainly based on high compression by an auxiliary compressor of air that is accumulated in a reservoir. The compressed air is typically injected at two different temperatures, one being relatively cold and the other being relatively hot, as heated by the heat energy recovered from exhaust gases or heaters. The intake compressed air is carried out with predetermined quantity from both temperatures as an injection into the cylinder which already contains a predetermined quantity of the burnt gases from the previous combustion cycle.