Double-valve fuel injecting device with electric-control monoblock pump and electric-control fuel injector

Abstract

The invention provides a double-valve fuel injecting device with an electric-control monoblock pump and an electric-control fuel injector, comprising the electric-control monoblock pump, a high-pressure fuel pipe and the electric-control fuel injector. The double-valve fuel injecting device is characterized in that a pressure accumulator and electromagnetic valves are arranged on the electric-control fuel injector, an inlet of the pressure accumulator is connected with the electric-control monoblock pump through the high-pressure fuel pipe, an outlet of the pressure accumulator is connected with a fuel inlet hole of the electric-control fuel injector, and the electromagnetic valves are installed on a throttle valve of the electric-control fuel injector and are connected with the throttle valve. Through the matching control on the electromagnetic valves of the monoblock pump and the electric-control fuel injector, the double-valve fuel injecting device can eliminate the influence of the rotary speed of a diesel engine on fuel injection pressure, inhibit the influence of pressure oscillation in the fuel injection process on the fuel injection, and flexibly control accumulating pressure before the fuel injection and the opening pressure of a fuel injection needle valve, thereby realizing the flexible control on the fuel injection pressure and the injection rule; and then the double-valve fuel injecting device satisfies the requirements of the diesel engine for the fuel injection when the diesel engine runs under different working conditions, improves the economical efficiencyand the dynamic property of the diesel engine, and reduces the discharge of harmful matters.

Description

technical field [0001] The invention relates to a fuel injection device, in particular to a fuel injection device meeting the injection requirements of large and medium-sized diesel engines under all operating conditions. Background technique [0002] In recent years, electronically controlled fuel injection technology for diesel engines has developed rapidly, and more and more diesel engines are equipped with electronically controlled fuel injection systems. Generally, the electronically controlled fuel injection system includes electronically controlled unit pumps, high-pressure oil pipes and fuel injectors. Using the rapid response of electronically controlled devices, it can realize fast and accurate control of the fuel injection quantity and injection law of the diesel engine, so as to improve the quality of the diesel engine. The purpose of economy, power and reduction of harmful emissions. [0003] At present, the electronically controlled fuel injection system appli...

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Problems solved by technology

[0003] At present, the electronically controlled fuel injection system applied to large and medium-sized diesel engines has been able to improve the control of fuel injection to a certain extent, but there are still many shortcomings that need to be further optimized and improved: 1. In addition to the common rail fuel injection system, The establishment of fuel injection pressure in diesel engine fuel injection system is closely related to the speed of diesel engine

When the diesel engine is at high speed, the fuel injection pressure is high, which can meet the requirements of fuel injection and combustion, but at low speed, the fuel injection pressure is low, and the atomization quality is poor, which will cause the combustion process to deteriorate, so that the economy of the diesel engine Poor, harmful emissions are also serious

2. The control ability of fuel injection is insufficient, it is difficult to realize the flexible control of fuel injection pressure and fuel injection law, and it cannot meet the requirements of diesel engines under various working conditions

3. Diesel fuel injection system is difficult to overcome the impact of pressure fluctuations on diesel fuel injection characteristics and the consistency and repeatability of each cylinder injection

4. The current high-pressure common rail fuel injection technology can solve the flexible control of fuel injection pressure and injection law, and can also suppress the influence of pressure fluctuations on fuel injection characteristics, but the high-pressure common rail fuel injection system has high cost and low reliability , low price

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