An electronically controlled accumulator fuel injector

Abstract

The invention provides an electronically controlled accumulator fuel injector, which includes a fuel injector body and a control plunger rod. A control valve, an armature assembly, a solenoid valve spring, a solenoid valve and a first A pressing mechanism, the control valve is tightly connected with the injector body through the second pressing mechanism, the control plunger rod is installed inside the injector body, and the needle valve spring is socketed outside the control plunger rod, and the lower end of the injector body Install the fuel injection nozzle assembly, which is provided with an oil inlet passage inside, the control plunger rod and the valve needle of the fuel injection nozzle assembly are integrated, and the needle valve spring presses the valve needle of the fuel injection nozzle assembly against the valve. On the body, the big head of the control plunger rod and the nozzle assembly form a control plunger chamber inside the injector body, and the control plunger chamber communicates with the high-pressure oil inlet passage. The electronically controlled accumulator fuel injector of the present invention controls the pressure of the plunger cavity through the orifice, so as to increase the opening power of the needle valve and reduce the opening resistance of the needle valve, thereby optimizing the fuel injection performance.

Description

technical field [0001] The invention belongs to the technical field of electronically controlled fuel injectors, in particular to an electronically controlled accumulator fuel injector. Background technique [0002] Conventional electronically controlled fuel injectors are divided into structures with accumulator and structures without accumulator. Generally, a control plunger rod is arranged in the pressure accumulation chamber of an injector with a pressure accumulation structure, and the pressure accumulation structure is also called a control plunger chamber. In general design, the control plunger chamber is directly connected with the high-pressure oil inlet passage, and the control plunger chamber is directly connected with the injector assembly. Since the volume of the oil tank of the injector is smaller than the volume of the control plunger cavity, it can be ignored. On the one hand, the control plunger cavity must control the operation of the needle valve, and on...

AI Technical Summary

Problems solved by technology

However, after the volume of the control plunger chamber increases, the structural size of the injector body will increase, and the high-pressure sealing safety of the control plunger chamber also needs to be reconsidered

At the same time, due to the increase in the volume of the control plunger cavity, it is also easy to cause the fuel injection rate to rise too fast at the initial stage of fuel injection, which is not conducive to matching the engine combustion performance.

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