Reforming Cylinder Engine Combustion Path Control
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Solution Overview
Problem
Existing internal combustion engine technologies face limitations in operational range and efficiency, particularly in achieving high thermal efficiency and reducing emissions, as they often require multiple fuels and catalytic devices.
Innovation Solution
A novel engine system utilizing a plurality of cylinders, where one cylinder functions as a reforming cylinder to generate oxidation products of different stages, which are introduced into working cylinders for mixed combustion, allowing for fuel reforming and stratification without extra catalytic devices, and regulating the combustion reaction path based on operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RCCI combustion mode uses different reactive fuels via controlling the proportion of the fuels, then the operation range is greatly broadened, but it needs two kinds of fuel, an extra fuel tank and two combustion systems
Solution Approach 1:
The invention extracts the fuel reforming function from external catalytic devices and relocates it inside the engine cylinder. By designating one cylinder as a reforming cylinder that performs partial oxidation of fuel to generate reactive intermediates (CO, H2, radicals), the system eliminates the need for separate fuel tanks and complex dual-combustion systems while maintaining broad operational flexibility through electronic control of injection timing and oxidation conditions
2Productivity
If D-EGR technique uses a plurality of cylinders to generate EGR and reforms to generate H2 and CO via in a dedicated cylinder, then the engine efficiency and emissions are improved, but it needs extra catalytic devices
Solution Approach 1:
The invention implements self-service by enabling the engine's own cylinders to perform the fuel reforming function. The reforming cylinder uses controlled partial oxidation to generate reactive species (CO, H2, free radicals) that are then introduced into working cylinders to enhance combustion efficiency and reduce emissions, eliminating dependency on external catalytic converters while maintaining the beneficial effects of fuel reforming
3Object-generated harmful factors
If traditional EGR technique introduces exhaust gas into the cylinder, then the combustion temperature is reduced and NOx formation is inhibited, but the operation range is limited
Solution Approach 1:
The invention creates a composite combustion atmosphere by combining traditional EGR (exhaust gas recirculation) with reformulated fuel containing reactive intermediates (CO, H2, radicals). This composite approach allows the system to maintain the temperature-lowering effect of EGR for NOx reduction while the added reactive species from fuel reforming broaden the operational range and improve combustion efficiency across different operating conditions
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 approach enhances engine efficiency and achieves clean combustion by controlling reactivity and concentration stratification, meeting EuroVI emission standards without the need for additional catalytic devices, and allows for broader operational ranges.
Implementation Method 1
a first cylinder of the engine is taken as a reforming cylinder to generate oxidation products of different stages
Implementation Method 2
generate oxidation products of different stages
Implementation Method 3
a compressor, and a main air inlet pipe connected to the compressor
Implementation Method 4
The air inlet system comprises a turbine, a compressor
Implementation Method 5
the EGR pipe equips with EGR valve and EGR cooler
Implementation Method 6
the reforming air intercooler is arranged on the reforming cylinder air pipe and between the reforming cylinder and pre-mixing chamber
Data Source
AI summary
The present invention discloses a novel engine controlled by combustion reaction path, which cylinders comprise working cylinders and reforming cylinders. According to the operational condition of engine, the engine is used for compressing, heating and reforming the fuel injected from the reforming cylinder injector; by controlling the reaction boundary conditions between fuel and air, the reforming cylinder can exhaust partial intermediate products or oxidation products of the different oxidation stages; the products are then mixes with the inlet air in the pre-mixing chamber and then is introduced into the working cylinder. Under operating in different working conditions, the engine can discharge the mixed gas with different activities under different oxidation stages by regulating the corresponding boundary conditions of the reforming reaction of the reforming cylinder, and can achieve concentration stratification and activity stratification of the mixed gas in the working cylinder by using the fuel injected from the working cylinder injectors, and can effectively achieve high effectiveness and broaden the scope of clean combustion by changing the combustion reaction path. The present invention just adopts simple oxidation reaction post-treatment device, and then the emission of the engine can meet the requirement of EuroVI emission regulation.