Automotive gasoline fuel for internal combustion engine

Abstract

A fast burning, gasoline type composition for spark ignited internal combustion engines having a ASTM D-86, 90% distillation temperature of 310° F. or less and an octane number (R+M) / 2 of 82 or less that can be used with a reduced spark advance in the engines to effect a reduction in NOx exhaust emissions. Also disclosed is a gasoline having low octane (82-87) which can be used interchangeably in engines having a reduced spark advance and in engines having conventional spark advance.

Description

[0001] The present invention pertains to gasoline compositions and the use thereof in spark ignited, internal combustion engines as in automobile type engines.BACKGROUND INFORMATION[0002] Pollutants produced by combustion include oxides of nitrogen which are more commonly referred to as NO.sub.x (where x is an integer which represents the number of oxygen atoms in the molecule). Such oxides include NO and NO.sub.2. In the combustion process NO.sub.x is formed by air (a gas containing nitrogen and oxygen) being subjected to high temperatures for a period of time. Recent studies have been made on lower 90% distillation temperature gasoline which show that faster burning gasoline (lower 90% distillation temperature) comes up to high temperature more rapidly increasing the time the nitrogen and oxygen in the air are exposed to high temperature thereby causing an increase in NO.sub.x (see the figure). This type of fuel is described in U.S. Pat. No. 5,015,356 which is incorporated herein ...

AI Technical Summary

Benefits of technology

[0009] It is a further objective of this invention to provide a fuel that is clean burning and which produces low levels of pollutants in the exhaust stream of an internal combustion engine.

[0010] It is a further objective of this invention to provide a gasoline having good driveability and cold start properties.

[0011] It is a still further object of this invention to provide a gasoline that will perform well at air to fuel ratios above stoichiometric in an internal combustion engine.

Problems solved by technology

Lower octane gasolines have been used in the past in low compression engines but were abandoned in common practice because of poor efficiency and power output.

Using prior art gasoline in engines that have a retarded spark advance causes an increase in pollutants of combustion so that prior art gasoline and the E-gasoline II cannot be used interchangeably in an engine having less spark advance.

Images