Piezoelectric-Solenoid Double Valve Electronically Controlled Injector

Abstract

The invention aims at providing a piezoelectric-electromagnetic bivalve electronic fuel injector. The piezoelectric-electromagnetic bivalve electronic fuel injector comprises a fuel injector head, a booster control valve, a booster piston, a fuel injection control valve, a nozzle, a cap nut and a fuel injector body. The pressurization process and the fuel injection process are controlled by a piezoelectric crystal and an electromagnetic valve respectively, so that the fuel injection process of the piezoelectric-electromagnetic bivalve electronic fuel injector is not restricted by the pressurization process; therefore, the piezoelectric-electromagnetic bivalve electronic fuel injector can work in a non-pressurization mode and a pressurization mode, injection is carried out according to therail pressure in the non-pressurization mode, ultrahigh-pressure injection is carried out in the pressurization mode, flexible adjustment of the pressure ratio can be achieved by changing the controlstrategy of the booster control valve in the pressurization mode, the reliability is higher, and the application range is wider. By means of the fuel injection control valve, the piezoelectric-electromagnetic bivalve electronic fuel injector can achieve micro-dynamic fuel return, the fuel return amount is greatly reduced, the response speed of a needle valve is increased, and the power performanceand economical efficiency of a diesel engine are effectively improved.

Description

technical field [0001] The invention relates to a fuel system, in particular to a marine diesel engine fuel system. Background technique [0002] The electronically controlled high-pressure common rail fuel injection system is the most promising control system. The high-pressure common rail fuel injection system is the core component of the diesel engine and plays a vital role in reducing diesel engine emissions. The future development of the diesel engine fuel injection system will show high Injection pressure, fuel injection volume and fuel injection schedule can be flexibly controlled. With the increasing energy crisis and environmental pollution, the improvement of diesel fuel injection system has been paid much attention. [0003] The pressurized electronically controlled fuel injector overcomes the problem that the traditional mechanical fuel injector's fuel injection law is restricted by the shape of the cam, and realizes the flexible and controllable fuel injection ...

AI Technical Summary

Problems solved by technology

[0003] The pressurized electronically controlled fuel injector overcomes the problem that the traditional mechanical fuel injector's fuel injection law is restricted by the shape of the cam, and realizes the flexible and controllable fuel injection timing, etc., and also has the effect of providing high injection pressure and fast response speed , with high control accuracy. However, the existing booster electronically controlled fuel injector has a single working mode, and it is difficult to flexibly adjust the boost ratio. For the booster electronically controlled injector controlled by a single valve, once If the solenoid valve fails, the entire fuel injector will not work normally, which will easily cause adverse consequences and poor working reliability

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