Internal Combustion Engine Cooling via Ventilation Cycle
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Solution Overview
Problem
Internal combustion engines face challenges with high temperatures in the combustion chamber and resulting pollution, despite advancements in technology, particularly in efficiency and emissions reduction.
Innovation Solution
An internal cooling method for internal combustion engines that incorporates a 'ventilation cycle' alongside the standard thermodynamic cycle, utilizing modified intake and exhaust valve operations to create a scavenging effect without compression or expansion, and the introduction of a cooling fluid to absorb heat, allowing for alternative engine functioning modes to manage temperature and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water or other fluids with high thermal capacity are injected into the combustion chamber for cooling, then the combustion chamber temperature is reduced and emissions are lowered, but the engine power and efficiency are compromised
Solution Approach 1:
The engine operation is segmented into two distinct modes: a thermodynamic cycle mode for power generation and a ventilation cycle mode for cooling. This segmentation allows the engine to switch between power production and cooling functions, enabling temperature control without permanently sacrificing power output.
Solution Approach 2:
The ventilation cycle is executed periodically as alternative cycles interspersed with thermodynamic cycles. This periodic cooling action allows the combustion chamber to be cooled at intervals without continuously compromising power generation, maintaining a balance between temperature control and power output.
2Temperature
If a ventilation cycle with intake and exhaust phases is implemented to cool the combustion chamber, then the combustion chamber is swept and cooled, but work is not produced during these cycles
Solution Approach 1:
The engine operation is divided into work-producing thermodynamic cycles and work-less ventilation cycles. This segmentation allows the system to dedicate specific cycles to cooling functions without permanently eliminating work production, as thermodynamic cycles continue to operate in between ventilation cycles.
Solution Approach 2:
The engine control system dynamically switches between thermodynamic cycle mode and ventilation cycle mode based on operational requirements. This dynamic adjustment allows the engine to optimize between power generation and cooling needs, making the system adaptable to varying operational conditions.
3Adaptability or versatility
If the exhaust valve opens briefly at the end of the 3rd stroke or beginning of the 4th stroke to compress dirty air, then the 4th stroke becomes a compression stroke, but the compression of remaining exhaust gases increases complexity
Solution Approach 1:
The exhaust valve timing is made dynamic and adjustable, allowing it to open briefly at specific moments (end of 3rd stroke or beginning of 4th stroke) to compress remaining exhaust gases. This dynamic control enables the system to adapt valve timing based on operational needs while managing the complexity through controlled, intermittent action rather than continuous modification.
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 method effectively cools the engine, reduces emissions, and maintains efficient combustion by minimizing heat input during compression phases, thereby improving engine performance and reducing pollution, particularly nitrogen oxides and microparticles.
Implementation Method 1
the introduction of a cooling fluid to absorb heat
Implementation Method 2
water is injected during the 5th stroke, where the high temperature causes the water to change into a vapor state, greatly increasing the pressure and generating expansion on the piston
Data Source
AI summary
Internal cooling method for internal combustion engines, comprising any of the following stages: (a) vary the openings and closings of combustion chamber intake and exhaust elements in order to modify the functioning cycle performed by the engine, carrying out just intake and exhaust strokes, without compression or expansion strokes; (b) inject a cooling fluid inside the engine; (c) interrupt the fuel injection and ignition systems.This method can be implemented in alternation together with a thermodynamic cycle in which the engine produces work.Combustion engine in which the previously described method is applied, which comprises at least one control unit configured to act on the functioning of combustion chamber intake and exhaust elements, as well as on the injection and ignition systems, and thus implement the stages of said method.