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A valve device for controlling the flow of a gaseous fluid to a combustion chamber of an internal combustion engine

IP.com Disclosure Number: IPCOM000035620D
Publication Date: 2005-Jan-27
Document File: 3 page(s) / 55K

Publishing Venue

The IP.com Prior Art Database

Abstract

A swirling flow, which mixes air and fuel, is arisen in combustion chambers of combustion engines before ignition. However, the swirling flow does not result in an optimal homogenous mixing of air and fuel for all operation conditions of the engine. The invention concerns internal combustion engines provided with at least two inlet passages to its respective combustion chambers. According to the invention, a slide device is arranged in front of the inlet openings of the respective inlet passages. The slide comprises openings, which are arranged to co-operate with the inlet openings of the inlet passages. A displacement motion of the slide device sets the openings of the slide device in different position in relation to the inlet openings. In such a manner, it is possible to vary the airflow through the respective inlet passages to the combustion chamber. The variation of the airflow influences on the speed of the swirling motion in the combustion chamber. By information about the actual operation conditions of the engine, it is possible to displace the slide device to a predetermined position for each operation condition of the engine such that a swirling flow is arisen in the combustion chamber, which results in an optimal homogenous mixing of air and fuel.

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A valve device for controlling the flow of a gaseous fluid to a combustion chamber of an internal combustion engine

In order to obtain an optimal combustion in a combustion chamber of an internal combustion engine, a substantially homogenous mixing of air and fuel is required before the mixture is ignited. Such a homogenous mixing may be accomplished by supplying a swirling motion of the air in the combustion chamber of a diesel engine before the fuel is injected. In an otto engine, such a homogenous mixing may be accomplished by supplying a swirling motion of the gaseous air-fuel mixture in the combustion chamber. Normally, the air supplying components of a combustion engine are dimensioned such that a swirling flow is obtained in the combustion chamber, which are acceptable with respect to emissions and efficiency, during all operation conditions of the engine. However, the swirling flow does not obtain a speed, which is optimal for all operation conditions of the engine.

The object of the present invention is to provide a valve device, which controls the flow of a gaseous fluid to a combustion chamber of an internal combustion such that a swirling flow in the combustion chamber is obtained, which provides a substantially homogenous mixing of air and fuel, during substantially all operation conditions of the internal combustion engine. The valve device is intended to be used in internal combustion engines provided with at least two inlet valves in its respective cylinders. The valve device comprises means, which makes it possible to reduce or to stop the flow of the gaseous fluid to the combustion chamber, through at least one of the two inlet valves.

Figs 1 and 2 show an embodiment of a valve device according to the invention arranged in an internal combustion engine, which here is exemplified in the form of a diesel engine. Fig. 1 shows a front view of the valve device. Fig. 2 shows a view of the valve device from the above. Two cylinder heads 1 with combustion chamber 2 of the diesel engine are visible in the figures. An air intake manifold 3 has an extension along an outer surface of the cylinder heads 1. Each of the cylinder heads 1 contains two air inlet passages 4a, b having an extension between the air intake manifold 3 and the combustion chambers 2. The air inlet passages 4a, b have an inlet opening 5a, b and an outlet opening 6a, b.  A supply of air to the combustion chambers 2 is, in a conventionally manner, controlled by not visible inlet valves, which are arranged to close and open the outlet openings 6a, b. The outlet openings 6a, b are arranged at an outer peripheral part of the combustion chambers 2. The air passages 4a, b and the inlet openings 6a, b are designed to give the air flow, which enters the combustion chambers 2, a direction and speed such that the formation of a swirling flow inside the combustion chamber is promoted.

According to the invention, a plate-shaped slide 7 is arranged in front of the inlet openings...