Fuel injection method and combustion engine with early pre-injection

摘要

A fuel injection method in an internal combustion engine and an internal combustion engine for performing the fuel injection method. The method includes heating fuel to a temperature between 300° F. and 840° F. (150 and 450° C.); pressurizing the fuel to a pressure exceeding 40 bar; pre-injecting at least 10% of the fuel charge as a pre-injected fuel during the intake stroke; injecting a fuel charge over at least part of the compression stroke into the cylinder; and injecting an ignition-injection of at least 10% of the fuel in a supercritical condition during the compression stroke at a rotational angle between 90° BTDCF and TDCF into the cylinder. The method and related combustion engine create a good mix of premix combustion and diffusion combustion increasing efficiency and consequently reducing emissions to the environment while also keeping noise and vibrations low.

主权项

1. A fuel injection method in an internal combustion engine comprising at least one piston that is connected to a crankshaft and reciprocates within a cylinder between a top dead center and a bottom dead center while the crankshaft rotates between an angular range of 360° before top dead center firing BTDCF and the top dead center firing TDCF, the piston performing over at least part of the range between 360° and 180° BTDCF an intake stroke and over at least part of the rotational angle between 180° BTDCF and TDCF a compression stroke, said method comprising:
heating fuel to a temperature between 300° F. and 840° F. (150 and 450° C.); pressurizing the fuel to a pressure exceeding 40 bar; pre-injecting at least 10% of the fuel charge as a pre-injected fuel during the intake stroke; injecting a fuel charge over at least part of the compression stroke into the cylinder; and injecting an ignition-injection of at least 10% of the fuel in a supercritical condition during the compression stroke at a rotational angle between 90° BTDCF and TDCF into the cylinder.