Pressure accumulator current limiting electromagnetic control injector

Abstract

The object of the present invention is to provide a pressure accumulating flow-limiting electromagnetic control fuel injector, including a fuel injector head, a fuel injector body, a current limiting assembly, a solenoid valve assembly, a needle valve return spring, a positioning pin, a nozzle, a needle valve, a needle Valve stoppers, seats, caps and seals. There is a pressure accumulator on the injector body, and the pressure accumulator is respectively connected with the main oil inlet hole on the injector head and the first oil through hole on the limit block, and the flow limiting component is installed in the injector body. The lower end of the flow limiting assembly communicates with the fuel oil passage in the injector body, the needle valve chamber communicates with the second oil chamber through the fourth oil inlet hole on the needle valve limit block, and the first oil chamber communicates with the second oil chamber through the third oil inlet hole on the valve seat. The oil inlet hole is connected with the high-pressure fuel oil circuit in the injector body, and the oil drain port is connected with the oil return port through the low-pressure oil circuit in the injector body. upper end. The invention has the advantages of fast response speed, high control precision, flexible fuel injection rule and stable operation when spraying with small fuel injection quantity.

Description

technical field [0001] The invention relates to a fuel injector, specifically a diesel fuel injector. Background technique [0002] Traditional mechanically controlled fuel injectors have the main advantages of simple structure and high operational reliability, but because the fuel injection timing, fuel injection pressure and fuel injection rate are restricted by the shape of the high-pressure fuel pump cam, it has slow fuel injection response and poor control of fuel injection. It is difficult to improve the fuel economy and emission characteristics of the engine on the basis of poor measurement accuracy and other deficiencies. Compared with the mechanically controlled injector, the electromagnetically controlled injector used in the diesel engine electronic injection system has faster response speed, flexible and controllable fuel injection characteristics, and more accurate control of the fuel injection quantity. However, it also has the following Disadvantages: The con...

AI Technical Summary

Problems solved by technology

[0002] Traditional mechanically controlled fuel injectors have the main advantages of simple structure and high operational reliability, but because the fuel injection timing, fuel injection pressure and fuel injection rate are restricted by the shape of the high-pressure fuel pump cam, it has slow fuel injection response and poor control of fuel injection. It is difficult to improve the fuel economy and emission characteristics of the engine on the basis of poor measurement accuracy and other deficiencies

Images