Method and device for preparing fuel-air mixture for...

F - Mech Eng,Light,Heat,Weapons – 02 – M

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F02M 27/02 (2006.01) F02B 43/08 (2006.01) F02B 47/02 (2006.01) F02B 47/08 (2006.01) F02B 75/12 (2006.01) F02M 27/04 (2006.01) F02M 31/04 (2006.01) F02M 25/07 (2006.01)

Patent

CA 2095524

A method for preparation of a fuel-air mixture consists in that the overrich flow of the fuel-air mixture before its mixing with a second flow is additionally heated by passing it through an activator heated up to a temperature exceeding the ignition temperature of the mixture and by providing for multiple contact of the flow with the surface of the activator. The device comprises a heat exchanger (1) connected through an inlet sleeve (3) to the exhaust manifold of the engine, and a device (5) intended for dosing the components of the mixture to be treated and provided with an air pipe (6), an exhaust gas pipe (7) and a fuel pipe (8). The device (5) is connected through a controlling unit (10) and a mixing pipe (9) to the inlet mixture circuit of the heat exchanger (1). In the outlet pipe of the heat exchanger is mounted, without a gap, an activator (12) which is a heating element with a developed surface, which may have different designs.

Procédé de préparation d'un mélange d'air et de carburant consistant à chauffer à nouveau l'écoulement trop riche du mélange d'air et de carburant avant de le mélanger à un second écoulement en le faisant passer dans un activateur chauffé jusqu'à une température dépassant la température d'allumage du mélange, et en assurant un contact multiple de l'écoulement avec la surface de l'activateur. Le dispositif comprend un échangeur thermique (1) relié par un manchon d'admission (3) au collecteur d'échappement du moteur, ainsi qu'un dispositif (5) destiné à assurer le dosage des composants du mélange à traiter et comportant un conduit d'air (6), un conduit de gaz d'échappement (7) ainsi qu'un conduit de carburant (8). Le dispositif (5) est relié par une unité de régulation (10) et un conduit de mélange (9) au circuit de mélange d'admission de l'échangeur thermique (1). Dans le conduit de sortie de l'échangeur thermique est monté, sans espace, un activateur (12) qui est un élément chauffant doté d'une surface développée, laquelle peut présenter différentes configurations.

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