A dual-channel fuel injector with controllable fuel mixing ratio and its control method

Abstract

The invention provides a double-oil duct oil injector capable of controlling fuel oil mixing ratio and a control method. The double-oil duct oil injector comprises a connector assembly, an external oil pipe connector and a valve body assembly, wherein the connector assembly comprises an upper connector, a middle connector and a lower connector; the two ends of the middle connector are connected with the upper connector and the lower connector separately; the external oil pipe connector is mounted at the top of the connector assembly; a nozzle is arranged on the lower connector; the external oil pipe connector comprises an L oil duct connector and an H oil duct connector inside; the connector assembly is provided with a second oil inlet duct, a first oil inlet duct and a mixing cavity; the second oil inlet duct and the first oil inlet duct communicate with the mixing cavity; and the valve body assembly is mounted in the connector assembly. According to the double-oil duct oil injector, the double oil inlet ducts can be adopted, switching of opening and closing of the two oil ducts is controlled and proportion of fuel oil injected from the two oil ducts to a combustion chamber is dynamically controlled through controlling flow area of the two oil inlet ducts and flow resistance of the two oil ducts.

Description

technical field [0001] The invention relates to the field of fuel injectors for diesel engines, in particular to a dual oil channel fuel injector with controllable fuel mixing ratio and a control method. Background technique [0002] At present, as emission regulations become more and more stringent, the emission requirements for diesel engines are getting higher and higher. In order to meet the requirements of national emission regulations, diesel engines manufactured and designed by various diesel engines generally use high-pressure common rail systems, and have higher emission requirements. The trend toward higher pressure in the common rail is to make the atomized particle size of the fuel injection finer, thereby reducing harmful emissions without reducing engine power. However, the rail pressure of the diesel engine high-pressure common rail system has exceeded 160MPa, and even reached 200MPa, which is getting closer to the application strength limit of the material, a...

AI Technical Summary

Problems solved by technology

However, after the heating and strengthening of diesel oil, it is injected into the combustion chamber to form a flash boiling phenomenon, and the reduction of atomized particles (SMD) also has certain defects, that is, the constant high-temperature diesel oil that has been heated and strengthened is injected into the combustion chamber, which can cause engine power. In order to deal with this shortcoming, the present invention proposes to inject diesel oil into the combustion chamber with a temperature gradient, which solves the decline in engine power and reduces the emission of the engine.

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