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Method for controlling an Egr circuit of a motor vehicle engine, valve for implementing said method, and engine having said valve

A technology of exhaust gas recirculation and motor vehicle, applied in the field of three-way valve and engine, which can solve the problems of complex EGR level and so on.

Inactive Publication Date: 2012-12-12
VALEO SYST DE CONTROLE MOTEUR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In gasoline type engines, on the other hand, obtaining the EGR level is a more complicated matter, since this type of engine is not always fitted with an air flow meter

Method used

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  • Method for controlling an Egr circuit of a motor vehicle engine, valve for implementing said method, and engine having said valve
  • Method for controlling an Egr circuit of a motor vehicle engine, valve for implementing said method, and engine having said valve
  • Method for controlling an Egr circuit of a motor vehicle engine, valve for implementing said method, and engine having said valve

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Embodiment Construction

[0038] refer to figure 1 , a motor vehicle internal combustion engine M comprising a combustion chamber 1 with a plurality of cylinders, in this case four cylinders, intended to receive a mixture of oxidizing agent and fuel (in this case gasoline), which Combustion in the cylinders produces work for the engine M. The operation of the engine M is conventional: gases enter the combustion chamber 1 where they are compressed, burned and then exit as exhaust gases; these are the conventional four strokes of an internal combustion engine (intake, compression, power, exhaust) .

[0039]The intake line 2a admitting gas to the engine M comprises an air intake duct 3 allowing charge air or fresh air (the flow of which is indicated by arrow F1 ), a compressor 4 for the charge gas (which in this case is turbo compressor) and heat exchanger 5 for cooling the gas leaving compressor 4. This heat exchanger 5 is generally known to those skilled in the art by its acronym "CAC", which stands ...

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Abstract

The invention relates to a method for controlling an exhaust gas recirculation circuit (2c) for an internal combustion engine (M) of a motor vehicle. The engine (M) is linked to an air intake circuit (2a) and to a gas exhaust circuit (2b) linked to the air intake circuit (2a) by the recirculation circuit (2c). A first valve (15) controls the flow of air upstream from the recirculation circuit (2c), and a second valve (16) controls the flow of exhaust gases that are recirculated within the recirculation circuit (2c). In the method of the invention, the recirculation of the exhaust gases is in particular controlled by means of measuring a pressure difference across the terminals of the second valve (16). The method comprises the following steps: a) the first and second valves (15, 16) are closed, the first valve (15) being arranged so as to allow, in a closed position, the passage of an air leak current; b) the first and second valves (15, 16) are concomitantly opened so as to provide a sufficient pressure difference across the terminals of the second valve (16) so as to enable the measurement of the pressure difference in the terminals thereof. Due to the invention, the pressure difference across the terminals of the second valve (16) remains sufficiently high so as to allow the efficient measurement of said pressure difference.

Description

technical field [0001] The invention relates to a method of controlling an exhaust gas recirculation line of an internal combustion engine of a motor vehicle, to a three-way valve for carrying out the method and to an engine comprising such a valve. Background technique [0002] A motor vehicle internal combustion engine includes a combustion chamber, usually formed by a plurality of cylinders, in which a mixture of oxidant and fuel is combusted to produce engine work. The oxidant includes air, which may or may not be compressed, depending on whether the engine has a compressor; when it is compressed, it may be called charge air. In addition, air (often referred to as "fresh air") can also be mixed with exhaust gases; these are referred to as recirculated exhaust gases, and this mode of operation is generally known to those skilled in the art as EGR (according to the English acronym), which stands for "Exhaust gas recirculation". The gas entering the combustion chamber is ...

Claims

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Application Information

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IPC IPC(8): F02M25/07F02D41/00
CPCF02M25/0798F02D2041/0017F02B29/0418F02D11/10F16K11/14F02M25/0786Y02T10/47F02M25/0709F02M25/0773F02D41/0077F02D21/08F02B37/00F02D2009/0276F02M26/06F02M26/51F02M26/54F02M26/64Y02T10/40
Inventor N.维蒂罗S.波蒂厄S.阿德诺特G.霍德伯格
Owner VALEO SYST DE CONTROLE MOTEUR