Mixture formation device for a gas engine and the gas engine

Abstract

The invention relates to a mixture formation device for an internal combustion engine operated with a burnable gas, preferably compressed natural gas CNG. The mixture formation device comprises a combination of a quantity regulator, a gas mixer, a flow-guiding element for pressure recovery, and a connection possibility for exhaust gas recirculation of the internal combustion engine. The mixture formation device according to the invention can empty a gas tank to a comparatively low pressure of about 2 bar, an excellent mixture formation being achieved over the entire range of speed and load range of the internal combustion engine. According to the invention, such a mixture formation device can reduce production costs as well as space requirements compared to known solutions. The invention also relates to an internal combustion engine operated with a burnable gas, particularly compressed natural gas (CNG), comprising such a mixture formation device in the intake tract thereof.

Description

technical field [0001] The invention relates to a mixture forming device for an internal combustion engine operated with a combustible gas, and to an internal combustion engine in which such a mixture forming device is arranged in an intake tract. Background technique [0002] Internal combustion engines are known from the prior art which are operated with combustible gases, for example liquefied natural gas (LPG—liquefied natural gas) or natural gas stored under pressure (CNG—compressed natural gas). Especially in the case of natural gas (CNG) stored under pressure, the challenge of feeding the gas into the combustion chamber of the internal combustion engine arises. Since gases have a significantly higher compressibility than (nearly incompressible) liquids, such gases cannot be injected into the combustion chamber of an internal combustion engine with conventional fuel pumps. Compressors for gaseous combustion substances are designed to be larger and higher than correspo...

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Problems solved by technology

[0006] However, it is disadvantageous for such a mixer with a fixed geometry that although it provides good results at a fixed operating point, such as, for example, an internal combustion engine in a combined thermal power plant, it is not suitable for dynamic operation, such as in a motor vehicle. Rather unsuitable or requiring significant additional control and regulation expenditure

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