Multi-stage premixed compression ignition method for gasoline fuels with low octane value

A multi-stage premixed compression ignition, low octane number technology, applied in fuel injection control, engine control, machine/engine, etc., can solve the problems of inability to widen direct control, high nitrogen oxide emissions, difficult heat release process, etc. Achieve the effect of soft and controllable low-polluting combustion process, low fuel consumption and low production cost

Active Publication Date: 2013-01-30
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in this field, the object of the present invention is to provide a multi-stage premixed compression ignition method for efficient, clean and controllable low-octane gasoline fuel, so as to break through the low thermal efficiency of the traditional spark-ignition gasoline engine and the uniformity of gasoline Mass-charge compression ignition mode combustion heat release process is difficult to directly control and cannot expand the load, and overcome the limitations of the gasoline partial premixed compression ignition mode pressure rise rate and high nitrogen oxide emissions under heavy load

Method used

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  • Multi-stage premixed compression ignition method for gasoline fuels with low octane value

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Embodiment 1

[0030] Use naphtha as fuel without adding anti-knock agents. The parameters of the engine used in the embodiment are: cylinder bore 83.1 mm, stroke 92 mm, connecting rod length 145.8 mm, compression ratio 16.7, intake valve closing time -130° CAATDC (relative to compression top dead center).

[0031] Electronically controlled high-voltage common rail system controls operation. When the engine speed is 2000r / mim and the load is 0.7MPa IMEP (average indicated pressure), the timing of naphtha injection is: the first injection is 80°CA before the compression top dead center, and the second injection is after the compression top dead center 5°CA (see figure 1 ), the injection pressure is 80MPa. Do two injections - burn. The proportion of fuel injection is 50% of the total fuel mass of the first injection cycle, and 50% of the total fuel mass of the second injection cycle. There is no overlap between the injection process and the combustion process. The indicated efficiency of ...

Embodiment 2

[0033] Use naphtha as fuel without adding anti-knock agents. The parameters of the engine used in the embodiment are: cylinder bore 83.1 mm, stroke 92 mm, connecting rod length 145.8 mm, compression ratio 16.7, intake valve closing time -130° CAATDC (relative to compression top dead center).

[0034] Electronically controlled high-voltage common rail system controls operation. When the engine speed is 1500r / mim and the load is 0.6MPa IMEP (average indicated pressure), the timing of naphtha injection is: the first injection is 40°CA before the compression top dead center, and the second injection is after the compression top dead center 5°CA, the injection pressure is 80MPa. Do two injections - burn. The proportion of fuel injection is 50% of the total fuel mass of the first injection cycle, and 50% of the total fuel mass of the second injection cycle. There is no overlap between the injection process and the combustion process. The indicated efficiency of this engine is 43...

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Abstract

The invention provides a multi-stage premixed compression ignition method for gasoline fuels with low octane values. When an engine runs, a multi-stage oil spraying and multi-stage premixed compression ignition combined mode is adopted in a range from a front 160 degree crank angle (CA) at a compression top dead point to a rear 40 degree CA at the compression top dead point, premixed compression ignition is performed each time when oil is sprayed; and oil spraying and combustion can be repeated for 1 to 3 times. According to the multi-stage premixed compression ignition method, multi-stage premixed ignition is performed, so that the problem that pressure rising rate is overhigh during large-load in a gasoline compression ignition mode is solved, and soft controllable slight-pollution combustion is performed. Due to relatively high premixed compression ignition speed, high content in the combustion and heat release processes is guaranteed, the heat efficiency is relatively high, and the fuel consumption is relatively low; the gasoline fuels with the low octane values are adopted, so that production cost of gasoline can be reduced, the using amount of anti-block additives harmful to the environment is reduced, and high-efficiency clean ignition of an internal combustion engine.

Description

technical field [0001] The invention belongs to the field of engine combustion control, and in particular relates to a multi-stage premixed compression ignition method using electric control. Background technique [0002] Energy and environmental issues are serious issues facing the world at present. Researchers in this field are also working on improving the thermal efficiency of engines and reducing nitrogen oxide emissions, so as to improve the utilization rate of fossil energy and reduce emission pollution. At present, the thermal efficiency of conventional gasoline engines is generally about 30%, which is much lower than that of diesel engines at 40%. The increase in compression ratio; and the inability to lean burn due to the use of three-way catalysts, resulting in lower thermal efficiency. [0003] The homogeneous charge compression ignition (HCCI) mode that has appeared in recent years has realized the compression ignition of gasoline engines, but the ignition time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/40
Inventor 杨洪强帅石金王志王建昕
Owner TSINGHUA UNIV
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