Abstract: The aim of the invention is to optimize the fuel distribution within the combustion air and to avoid the formation of liquid fuel nuclei. Direct fuel injection using two or more injector nozzles per combustion chamber is used in heat engines, such that the fuel envelopes are partly or completely formed by each injection nozzle such as to overlap each other from opposing directions. The mixture formation is influenced by the selection of a determined angle and the arrangement of the symmetry axis. Preferred applications are single- and multi-cylinder petrol and diesel engines with direct injection of conventional and alternative fuels with multi-orifice nozzles and pintle nozzles.

Abstract: A method of injecting fuel in multicylinder engines. A fuel pre-pressure is generated to be converted within acceleration pipes by opening controlled shutoff valves and recirculating fuel to a fuel pump inlet. The fuel under pre-pressure is conveyed via a fuel pump into a pre-pressure common rail common to several engine cylinders. This pre-pressure is only a fraction of the required injection pressure. When the pre-pressure is exceeded, fuel is fed from the pre-pressure common rail, via pressure-limiting valves, into a return common rail common to several engine cylinders. The shutting off of the shutoff valves provokes a steep rise of fuel pressure, due to a water hammer effect. This produces a high-pressure wave since the closed shutoff valve supplies high pressure for fuel injection through the respective injection nozzle associated with the shutoff valve. One acceleration pipe is used for every shutoff valve between the pre-pressure common rail and the return common rail.