High-pressure common-rail oil injector based on electromagnetic proportional valve oil injection rule flexibility and controllability

Abstract

The invention aims to provide a high-pressure common-rail oil injector based on electromagnetic proportional valve oil injection rule flexibility and controllability. A pressure storage cavity and an oil return path are arranged in an oil injector body, an additional electromagnetic proportional valve liquid return cavity is arranged below an additional electromagnetic proportional valve part, an electromagnetic valve oil return cavity is arranged below an electromagnetic valve part, a control cavity is arranged above an oil nozzle part, a needle valve reset spring cavity is formed in the upper portion of an oil nozzle, an oil containing groove is formed in the middle of the oil nozzle part, the pressure storage cavity communicates with the control cavity and the oil containing groove, the control cavity communicates with a control cavity additional oil return path, and the pressure storage cavity communicates with the control cavity through a control cavity oil inlet throttling hole. According to the oil injector, opening of the additional oil return path can be controlled at any time in the oil injection process to accelerate oil return, the opening degree of the control cavity additional oil return path can be controlled by controlling signals input into an additional electromagnetic proportional valve coil, and therefore a slow-first and fast-second oil injection rule curve can be further adjusted, and in the working process, flexibility and controllability of the oil injection rule can be realized.

Description

technical field [0001] The invention relates to a fuel injector, in particular to a high-pressure common rail fuel injector for a diesel engine. Background technique [0002] The mechanical fuel injection system has the advantages of high reliability and simple structure. However, its fuel injection timing, fuel injection pressure and fuel injection rate are determined by the cam profile of the high-pressure fuel pump, that is, the fuel injection process is completely dependent on the fuel supply characteristics, which cannot be achieved. According to the working conditions of the diesel engine, the flexible and precise injection of fuel is realized. The high-pressure common rail system is one of the core systems for modern diesel engines to achieve energy saving and emission reduction due to its higher fuel injection pressure and more flexible and controllable cycle fuel injection volume. [0003] Due to its structural characteristics, the high-pressure common rail system ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a solution based on the problem that the current traditional high-pressure common rail system cannot adjust the fuel injection rules at any time according to different working conditions to achieve an ideal combustion process, thereby improving the economy and emissions of diesel engines to a greater extent. High-pressure common rail injector with flexible and controllable injection rules of electromagnetic proportional valve

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