Secondary air injection

About: Secondary air injection is a research topic. Over the lifetime, 11452 publications have been published within this topic receiving 112147 citations.

Fuel injection control device for in-cylinder fuel injection engine

Abstract: PROBLEM TO BE SOLVED: To improve starting capability of an engine and exhaust gas emission, by properly setting a share ratio between the amount of the fuel to be injected into the inside of a cylinder and that to be injected into an air-intake pipe, taking into consideration the particulated condition of the fuel into the cylinder at the time of engine start. SOLUTION: When an engine is under control for start-up, the whole required amount of fuel injection for start-up is determined based on the temperature of the engine water (S1-S3), and then, referring to the share table based on the pressure of the high pressure fuel, an in-cylinder share of the fuel injection against the whole required amount of fuel injection, that is, a share ratio, is determined (S4-S5). Then, the amount of fuel to be injected into the inside of a cylinder through an in-cylinder injector is determined by multiplying the whole required amount of fuel injection by the share ratio, thereby setting the fuel injection pulse width (S6, S7). Thereafter, the amount of fuel to be injected outside a cylinder through an outside-cylinder injector is determined by multiplying the whole required amount of fuel injection by the complement number of the share ratio (1-share ratio), thereby setting the fuel injection pulse width (S8, S9). This makes it possible to avoid supplying fuel at a time when the injection fuel in particulate form is of poor quality, thereby improving the starting capability of the engine. COPYRIGHT: (C)2001,JPO

Exhaust gas control apparatus and exhaust gas control method for internal combustion engine

Abstract: An exhaust gas control apparatus for an internal combustion engine is provided with an exhaust catalyst disposed in an exhaust passage (4) of the internal combustion engine, a concentration detection unit (10) that is capable of detecting a total concentration of a sulfur oxide and a hydrogen sulfide contained in an exhaust gas that passes through the exhaust catalyst, and detecting a concentration of the sulfur oxide, and a sulfur concentration estimation unit (15) that estimates a concentration of sulfur contained in a fuel based on a detection value of the concentration detection unit (10) when it is determined that the exhaust gas is at one of a stoichiometric and rich air/fuel ratio.

Water vapor injection system

Abstract: The present invention relates to a water vapor injection system for introducing artificially high humidity air into the carburetor of an internal combustion engine Once delivered to the carburetor, the high humidity or moisture-laden air mixes with the air-fuel mixture normally passing from the carburetor into the combustion chambers to increase the combustion efficiency of the internal combustion engine A forced air system is generated by an air injection pump, and this forced air is heated to alter its vaporization characteristics prior to being circulated through a water filled container As the heated air is exposed to the water within the container, the air increases in moisture content as the heat associated with the air tends to vaporize water about the interface between respective bubbles and the surrounding water Because of the continuous force of the pump, the high moisture air realized from passing the air through the water filled container is then forced from the container into the immediate area of the top of the carburetor There the moisture-laden air generated by the water vapor injection system is mixed with the normally injected air supply and, accordingly, the water content of the final air-fuel mixture is increased which, expressed generally, significantly increases the efficiency of the combustion process within the internal combustion engine

Synoptic Survey of Hypolimnetic Aeration

Abstract: Hypolimnetic aeration/oxygenation is a means whereby thermal stratification can be maintained in a lake or reservoir and the hypolimnetic waters are oxygenated. Seventeen different hypolimnetic aerator/oxygenator designs are presented and analyzed, categorized as mechanical agitation systems, pure oxygen injection systems, and air injection systems. Air injection systems can be further subdivided into full air lift designs, partial air lift designs and downflow air injection. Of all the systems, the full air lift is probably the most efficient in terms of energy consumed to dissolve a given amount of oxygen. None are in widespread usage.

Treatment Systems and Methods for Internal Combustion Engine Exhaust Streams

Abstract: Emissions treatment systems and methods are disclosed, which reduce the carbon monoxide, unburned hydrocarbons, and nitrogen oxides content in the exhaust stream of an internal combustion engine adjusted to a rich combustion ratio. One embodiment of a system comprises an ammonia oxidation catalyst, a supplemental air supply for providing a lean combustion ratio, and at least one three-way catalyst. Another embodiment further comprises a second three-way catalyst located in the exhaust stream.