Tonen Corporation

Exxonmobil Research and Engineering Company

Kazuyoshi Namiyama

Kazuyuki Murakami

Kakuro Kokubo

Daijiro Hosogai

Kazushi Tsurutani

Taiji Kobayashi

Noboru Higashimoto

Noriaki Omori

Noriaki Oomori

Masami Endoh

Makoto Yoneda

The inventions relate to light oil compositions comprising a base oil, not less than 0.01% by volume of a light oil resulting from catalytic cracking and 20 to 200 ppm (on the weight basis) of a lubricity improver, with a total sulfur content of not more than 0.05% by weight, characterized in that the light oil resulting from catalytic cracking contains (1) not less than 25% by volume of bicyclic polycyclic aromatic compounds and (2) not less than 5% by volume of tricyclic polycyclic aromatic compounds. These compositions have a sulfur content of not more than 0.05% by weight and is excellent in lubricant performance.

Light oil composition

This invention provides a base fuel oil, having improved response to lubricity additives, for diesel fuel oil characterized by (1) sulfur content of 0.03 wt % or less, (2) nitrogen content of 35 wt. ppm or less, (3) density of 0.835 g/cm,or less and (4) solubility parameter of 7.00 to 8.10, and also provides a diesel fuel oil composition comprising the above base fuel oil incorporated with a lubricity additive.

Base fuel oil for diesel fuel oil and diesel fuel oil composition comprising the same

Fuel supply in an ultrasonic atomizer is conducted according to a fuel increment ratio pattern in which the increment of fuel in fuel increment control for starting and warming up is 70% or less of that in a typical conventional pressure injection valve system, thereby improving startability, accelerability and fuel consumption rate and further enabling a reduction in exhaust emissions. When the engine is started in low-temperature conditions, the fuel is supplied by continuous injection to make uniform and reduce the mean diameter of droplets of atomized fuel, thereby improving the ignitability and startability. The fuel injection start timing is varied in accordance with the combustion chamber temperature at the time of starting the engine, i.e., when the engine is to be started in low-temperature conditions, no fuel is injected until a predetermined time has elapsed, and the fuel injection is started after the combustion chamber temperature has been raised by means of compression heat by driving the starter, thereby improving the cold startability even in the case of a fuel with a relatively high flash point. When the engine is in a transient operating condition, fuel injection from the ultrasonic atomizer is executed immediately before the velocity of an air stream in the vicinity of the ultrasonic atomizer rises, whereby the fuel that is atomized with a sufficient spread in the intake pipe can be carried in this state by the air stream to the combustion chamber where it is burned.

Fuel supply control method and ultrasonic atomizer

Growing community of inventors

Saitama, Japan

Kazuyoshi Namiyama