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Fuels for Homogeneous Charge Compression Ignition Combustion Engine

a technology of homogeneous charge and combustion engine, which is applied in the direction of fuels, liquid carbonaceous fuels, petroleum industry, etc., can solve the problems of engine operation restrictions, and achieve the effects of enhancing engine output, quiet engine combustion, and lowering the maximum pressure rise ra

Inactive Publication Date: 2009-06-18
NIPPON OIL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0033]The fuel of the present invention can lower the maximum pressure rise rate of homogeneous charge compression ignition combustion and thus achieves a quiet engine combustion. Furthermore, the fuel can enhance the engine output by 20 percent or more under the same maximum pressure rise rate, comparing with the conventional fuels.

Problems solved by technology

For the HCCI engine, the engine operation is restricted at a low load range because of heavy engine noises (high maximum pressure rise rate) over the middle range of the engine load.

Method used

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  • Fuels for Homogeneous Charge Compression Ignition Combustion Engine
  • Fuels for Homogeneous Charge Compression Ignition Combustion Engine
  • Fuels for Homogeneous Charge Compression Ignition Combustion Engine

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0075](Engine Operation Conditions)

[0076]The engine was operated at an engine speed of 1000 rpm, an absolute boost pressure of 155 kPa and an intake manifold temperature of 58° C. The experiment described below was carried out for each fuel under the same engine conditions such as compression ratio, engine speed, boost pressure, intake manifold temperature, air flow rate, intake-exhaust valve timing and EGR rate except that the fuel injection quantity was varied.

[0077](Fuels)

[0078]FIG. 2 shows the chart of 400 cycle averaged crank angle of 50% burn of high temperature heat release (HTHR CA50) and indicated mean effective pressure (IMEP) obtained by driving the engine using various fuels. Where fuels with the substantially same IMEP and HTHR gathered were selected as Points 1, 2 and 3, and the change in maximum pressure rise rate over 400 cycles in each of the points were measured (the detail of this experiment should be referred to “SAE2008-01-0007” published in April, 2008).

[0079]F...

example 2

[0081](Fuel)

[0082]The following fuels with the same research octane number were prepared (when the difference in the research octane number between PRF series fuels and NTL series fuels measured on a CFR (Cooperative Fuel Research) engine in accordance with JIS K 2280 is within 3, it was regarded as inaccuracy).

[0083](1) Fuels with a research octane number of 75

Comparative Examples

PRF75, NDB75, NMP75, NCP75

Example NTL75

[0084](2) Fuels with a research octane number of 80

Comparative Examples

PRF80, NDB80, NMP80, NCP80

Example NTL80

[0085](3) Fuels with a research octane number of 85

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Abstract

The present invention provides a fuel capable of controlling the combustion reaction during homogeneous charge compression auto-ignition combustion to improve the engine thermal efficiency. The fuel satisfies specified characteristic requirements relating to: (1) the total content of C5 to C10 normal paraffins; (2) the total content of C6 to C11 aromatic hydrocarbons; (3) the content of olefinic hydrocarbons; (4) the content of oxygenates; (5) the research octane number; (6) the initial boiling point and end point in distillation characteristics; (7) the averaged maximum pressure rise rate of the fuel over continuous 400 cycles; and (8) the averaged IMEP of the fuel over continuous 400 cycles.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to fuels for homogeneous charge compression ignition engines, more specifically to those capable of controlling the combustion reaction during homogeneous charge compression combustion to improve the engine thermal efficiency.[0002]Nowadays, two types of engines have been widely used, one of which is a spark ignition gasoline engine and the other of which is a compression ignition engine (diesel engine).[0003]For the spark ignition gasoline engine, fuel is injected into the intake port or the combustion chamber, and premixed gas of air fuel mixture is formed. Then the premixed gas is ignited by a spark plug and combusted. The fuel is required to have high vaporization and low auto-ignitability characteristics. Since the spark ignition gasoline engine emits nitrogen oxides (NOx) , hydrocarbons (HC) and carbon monoxide, a three-way catalyst has been widely used for purifying these emissions. However, an exhaust gas purific...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L1/18
CPCC10L1/026C10L1/08C10L1/19C10L1/1824C10L1/1852C10L1/18C10L1/183C10L1/182
Inventor SHIBATA, GEN
Owner NIPPON OIL CORP
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