High-pressure double-solenoid valve fuel system characteristics (Figure)

Posted by uuuseff on November 19th, 2019

The electronic control unit pump and electric control common rail injector were used to construct the dual solenoid valve fuel system to realize the independent control of oil supply and fuel injection. The experiment of the dual solenoid valve fuel system was carried out. The dual valve fuel system was established by AMESim software Simulation model. The simulation analysis of the characteristics of the dual solenoid valve fuel system shows that: by changing the fuel injection and injection time interval, maintaining the injection angle can be achieved under different fuel injection laws; in the process of fuel injection by 2 can To achieve pre-injection; by increasing the fuel supply time, high-pressure injection can be achieved at low speeds. The dual solenoid valve scheme provides independent control of fueling and fuel injection, with the potential to achieve the desired fuel injection pattern. The dual-valve-controlled intelligent fuel injection system can not only achieve high injection pressure and ramp injection law, but also easily achieve high low-speed injection pressure and multiple injection. It is one of the directions for the development of diesel fuel system [1-2 ]. Typical dual-valve fuel system abroad Delphi's pump-nozzle based E3 double valve system [3 ~ 4], Caterpillar's HEUI2C system and Bosch's APCRS double valve system, the common features of these fuel systems are through 2 A solenoid valve to achieve independent control of fuel supply and fuel injection, making the fuel system more flexible. This paper explores a dual solenoid valve fuel system that combines the electric fueling of a single pump with the electronic fuel injection of a common rail injector, and studies the characteristics of the fuel system based on experiments and simulations. 1 Double Solenoid Valve Fuel System Solution The double valve fuel system is composed of an electrically controlled single-unit pump connected by a high-pressure fuel pipe and a common-rail fuel injector. The principle is shown in FIG. 1. Fig. 1 The schematic diagram of the dual solenoid valve fuel system The two solenoid valves are the spill valve (SV) at the pump end of the monomer pump and the needle cont rol valve (NCV ). The SV valve is a normally open solenoid valve. The compressed fuel formed by the fuel supply cam pushing up the fuel supply plunger flows back to the low pressure oil line through the SV valve, and no high pressure is generated in the system. When the SV valve is closed, cut off and low-pressure oil passage, with the fuel plunger up, high-pressure tubing began to form high pressure, to achieve electronic control of oil supply. NCV valve is normally closed solenoid valve, closed by the SV valve to form a high-pressure fuel in the injector needle pressure generated at the upper end than the lower end, the needle can not open. When the NCV valve is opened, the high-pressure fuel and the low-pressure oil line at the upper end of the needle valve are turned on, the pressure at the upper end is reduced, the needle valve is opened, and the fuel injection starts to realize the electronic control of fuel injection. If the SV valve is closed before the NCV valve is opened, the pump will produce high-pressure fuel in the system until the NCV valve opens the nozzle to begin injection, and the time interval between the opening of the NCV valve and the closing of the SV valve will determine the injection pressure and injection The average injection pressure in the process. If the SV valve is closed and the SV valve is closed while the NCV valve is closed, the needle valve will maintain high pressure in the tubing after it is closed, allowing multiple injections. If the NC valve is closed and the SV valve is unloaded, the needle closing action will be simultaneous From the reduction of hydraulic pressure and needle return spring force, to achieve fast oil break. Thus, the dual solenoid valve fuel system through the combination of two solenoid valves to achieve the fuel pressure during the flexible adjustment process, with the regulation of jetting ability to adjust. 2 double solenoid valve fuel system experiment 2.1 experimental system uses two-valve fuel system components in Table 1 parameters. In the experiment, a control prototype was developed using the Dspace / MicroAutoBox design for the control of a dual solenoid valve fuel system. A Kistler pressure sensor is attached to the high-pressure tubing near the mouth to measure tubing pressure. Current calipers are used to measure the drive current for NCV and SV valves. 212 Experimental results Maintaining the rotational speed of the cam 500 r / min, the amount of fuel injected per cycle of 80 mm3, NCV control valve driving time constant, adjust the NCV valve driving duration and SV valve driving time and duration. In order to prevent the tubing pressure is too high after the NCV valve is closed, NCV and SV valves are guaranteed to be powered off at the same time during the control. The driving current characteristics are shown in FIG. 2. Figure 2 NCV valve and SV valve control current curve Figure 3 is the three injection test rail pressure. Obviously, due to the SV valve relative to the NCV valve control time is different, the corresponding three times the fuel injection characteristics are not the same. Figure 3 tubing pressure curve 3 simulation analysis 3.1 simulation model using AMESim software to establish a dual solenoid valve fuel system model shown in Figure 4. In this model, the SV valve directly simulates the control of the solenoid valve by experimentally obtained stem displacement characteristics. The NCV valve is simulated using the experimentally obtained electromagnetic force. Figure 4 dual solenoid valve fuel system simulation model Section 2 experimental results and the corresponding experimental data comparison shown in Figure 5. The experimental results of the tubing pressure under the three conditions are in good agreement with the simulation results, which shows that the simulation model can reflect the characteristics of the two-valve system. Therefore, the model is used to further analyze the characteristics of the dual-valve fuel system. Figure 5 tubing pressure experiment and simulation results comparison curve 3.2 injection characteristics to maintain the crankshaft speed 800 r / min, each cycle of oil supply 100 mm3, the same injection time, adjust the SV valve and NCV valve control moment, the corresponding control such as As shown in FIG. 6, the oiling and fueling characteristics shown in FIG. 7 are obtained. Three kinds of conditions corresponding to the fuel characteristics in Table 2. In the third simulation, the time of fuel injection is the same as the fuel injection, but the injection pressure, cracking pressure, maximum injection rate and injection duration are different, and the final injection law is different. This shows that at the same speed, by changing the SV valve advance and duration and duration of the NCV valve, the injection timing can be maintained under the conditions of different injection characteristics to obtain the same injection quantity, which in the same conditions under

We are a professional manufacturer of Pneumatic Concrete Nailer .

Nail guns are characterized by:
● Industrial-grade nail gun, enhanced impact force, nailing fast strong.

Easy Insurance design, to use safe, secure.

Easy-molded rubber handle and ergonomic gun body design operation.

Concrete Nailer

Concrete Nailer,Pneumatic Concrete Nailer,Siding Pneumatic Nailer,Concrete T Nailer,Concrete T Air Nailer

DAHOO Tools Co., Ltd. , http://www.dahootools.com

Like it? Share it!


uuuseff

About the Author

uuuseff
Joined: November 10th, 2018
Articles Posted: 183

More by this author