Method for preparing an air-fuel mixture for an internal combustion engine, device for realizing the same and heat-exchanger

摘要

The present invention pertains to the field of engine construction and may be used in the inlet systems of internal combustion engines for processing a portion of the rich air-fuel mixture fed into the main flow, wherein the liquid fuel is pulverised and converted into gas. The purpose of this invention is to increase fuel savings, to reduce the exhaust gas toxicity and to enable the use of a cheaper low-octane fuel. The method for preparing the air-fuel mixture comprises using the heat from the hot gases produced for heating the excessively rich mixture flow that contains between 10 and 100% of petrol to be used by the engine, wherein said heating is carried out before mixing the mixture with the second flow. The mixture is then submitted in one or more steps to the thermal action of activators with compensation for the air used during the reactions. The device of the present invention comprises a heat exchanger (1) as well as a unit for dosing the mixture components (2), wherein said unit is connected by an inlet duct (5) to the mixture circuit through which said mixture is fed into a chamber (3) with an activator (4). The hot gases are generated in this chamber and flow through the inlet duct (6) of the gas circuit as well as through the outlet duct (7) thereof into the engine inlet system. The activator (4) chamber is connected to a pipe (8) and to a plurality of nozzles (9) for supplying additional air to the activator. The heat exchanger includes a body having an embossed partition therein that defines a plurality of cells-channels for the flow of the heat-carrier and the heating medium, wherein the walls of each cell-channel are connected together at their end portion up to half the height of the channel.