Piezoelectric and electromagnetic combined double valve device

Abstract

The invention provides a piezoelectric and electromagnetic combined double valve device. It includes a solenoid valve, a piezoelectric actuator and a valve body shell, the solenoid valve and the piezoelectric actuator are installed inside the valve body shell, and the solenoid valve is mounted on the piezoelectric actuator. The invention has fast action response capability, can quickly close and open the fuel overflow control valve, quickly build up the fuel pressure or quickly release the fuel to lower the pressure; by controlling the action of the needle valve of the fuel injector, it can control the fuel flow before injection. The accumulated pressure and the opening and closing pressure of the injector needle valve enable the injector needle valve to open and close more quickly, and the opening and closing of the injector needle valve has nothing to do with the fuel injection pressure, so that the fuel injection can be controlled Pressure, get different fuel injection rates, realize multiple fuel injection rules, can meet the requirements of diesel engines on fuel injection pressure and fuel injection rules under different working conditions and loads, improve the economy and power of diesel engines, reduce noise and reduce hazardous emissions.

Description

technical field [0001] The invention relates to a fuel injection device, in particular to a fuel injection device which simultaneously satisfies the injection requirements under different working conditions of a diesel engine. Background technique [0002] Electronic control of the fuel injection system of diesel engines is an important direction for the development of diesel fuel injection systems today. The use of piezoelectric actuators or high-speed solenoid valves can achieve precise control of the fuel injection volume and injection rules of diesel engines, so as to improve the quality of diesel engines. The economic performance of the diesel engine, the purpose of improving the power performance of the diesel engine and reducing the harmful emission of the diesel engine. [0003] The traditional electronically controlled fuel injection system usually adopts single solenoid valve or high-speed piezoelectric actuator control mode. Although the optimal control of fuel in...

AI Technical Summary

Problems solved by technology

Third, in addition to the common rail fuel system, the fuel injection pressure of this control method is closely related to the diesel engine speed. At low speeds, the fuel injection pressure is low, the atomization quality is poor, and the combustion process is difficult to optimize

Fourth, the opening and closing of the needle valve of the fuel injector is closely related to the fuel injection pressure. In the single solenoid valve control mode, the opening and closing speed of the needle valve of the fuel injector cannot be controlled, especially when the fuel injection pressure is low at low speeds. , the opening and closing speed of the needle valve will be slower, and it is difficult to complete the task of multiple injections

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