Topic
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.
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Patent•
23 May 1995
TL;DR: In this paper, a temperature control system in an internal combustion engine includes a heating arrangement which channels a flow of temperature control fluid from an engine to and from an exhaust heating assembly which is located adjacent to an exhaust manifold in the engine.
Abstract: A temperature control system in an internal combustion engine includes a heating arrangement which channels a flow of temperature control fluid from an engine to and from an exhaust heating assembly which is located adjacent to an exhaust manifold in the engine. The exhaust heat assembly permits the transfer of heat from the exhaust gases flowing in the exhaust manifold to the temperature control fluid. The heated temperature control fluid is then directed back to the engine for efficient heating. In one embodiment, the temperature control fluid is directed through a heat exchanger in the engine oil pan so as to maintain the temperature of the engine lubricating oil at or near its optimum operating temperature. In a second embodiment, the temperature control fluid is directed from the exhaust heat assembly to the intake manifold so as to increase the temperature of the intake air prior to combustion.
28 citations
Patent•
17 Mar 2003
TL;DR: In this article, a tuned exhaust system for small two-cylinder engines, the exhaust system including a pair of exhaust passage through which exhaust gasses pass is described, and the exhaust passages are dimensioned to providing a tuning effect to the exhaust gass for enhanced engine performance.
Abstract: A tuned exhaust system for small two cylinder engines, the exhaust system including a pair of exhaust passage through which exhaust gasses pass. The exhaust passages are dimensioned to providing a tuning effect to the exhaust gasses for enhanced engine performance. The exhaust passages are not straight and elongated, but rather are sprialed, scrolled, coiled, or otherwise folded upon themselves at least twice. In this manner, the exhaust passages may be housed at least in part within a muffler having a significantly reduced overall size or profile, such that the muffler may be used in small engines.
28 citations
Patent•
21 Feb 1985
TL;DR: In this article, an approach for catalytic cleaning of the exhaust gases of furnace systems is described, where catalytic converters are used to accelerate the reaction of the oxides of nitrogen with the admixed chemical compounds.
Abstract: Apparatus for catalytic cleaning of the exhaust gases of furnace systems. For selectively eliminating nitrogen oxides in the exhaust gases of furnace systems, chemical compounds, such as ammonia in vapor form, are introduced into the exhaust gases emerging from the furnace systems. The exhaust gases are then passed through a catalytic converter, which initiates and/or accelerates the reaction of the oxides of nitrogen with the admixed chemical compounds. In different zones in the catalytic converter, the exhaust gases that are to be treated catalytically and of at least one current of cleaning gas are passed in a countercurrent. The location of the catalyst zones through which the exhaust gases and the cleaning gas, respectively, flow is varied continuously or intermittently. The catalytic converter has catalyst elements disposed in a carrier, and the carrier and the gas connections relative to one another.
28 citations
Patent•
10 Apr 1943TL;DR: In this article, a fuel injection nozzle of the outwardly opening valve type adapted for delivering timed injections of liquid fuel, into an internal combustion engine is described, which may be employed either for the Injection mechanism or for the combustion engine.
Abstract: My invention relates to fuel injection mechanism, and more particularly to a fuel injection nozzle of the outwardly opening valve type adapted for delivering timed injections of liquid fuel, into an internal combustion engine. Nozzles of this character may be employed either for the Injection...
28 citations
TL;DR: In this paper, a series of experiments on venturi tubes were conducted to investigate the effect of air inlet hole diameter on air injection and there was an optimal diameter that maximizes air injection.
Abstract: The oxygen concentration in water is a prime indicator of the water quality for human use as well as for the aquatic biota. The physical process of oxygen transfer or oxygen absorption from the atmosphere acts to replenish the used oxygen. This process is termed re-aeration or aeration. Venturi aeration is a method of aeration that has become popular in recent years. A venturi tube allows air bubbles to be inserted into flowing water from air inlet holes and so increases oxygen levels in the water. In the present study, a series of experiments on venturi tubes were conducted to investigate the effect of air inlet hole diameter on air injection. It was observed from the results that air inlet hole diameter on venturi tube played a significant role in air injection and there was an optimal diameter that maximizes air injection. Moreover, a multiple non-linear regression equation was obtained for venturi tubes relating air flow and water flow to Reynolds number, inlet diameter and air inlet hole diameter.
28 citations