KR960007908Y1 - Fuel ejecting apparatus - Google Patents

Abstract

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Description

Automotive Fuel Injectors

1 is a view showing the configuration of a fuel injector for automobiles according to the present invention

2 is a cross-sectional view with the fuel injector of the present invention mounted.

3 is a schematic view showing a configuration of a fuel injector for a vehicle of the prior art

4 is a side cross-sectional view with a fuel injector of the prior art mounted.

* Explanation of symbols for main parts of the drawings

3: delivery pipe 6: cylinder head

7: intake port 7a, 7b: port

8: fuel injector 20, 21: flexible tube

22: guide 23: Piston Road

24: cylinder 25: solenoid valve

26: surge tank 27: supply tube

29: discharge tube 30: elastic member

31: stopper 32: ECU

The present invention relates to a fuel injector for an automobile, and more specifically, to adjust the injection angle of the fuel injector to automatically set the fuel injection position that best suits the engine conditions, thereby increasing the output of the engine as well as fuel economy. The present invention relates to a fuel injector for a vehicle that can reduce the cost and improve driving performance.

The fuel injector injects fuel into the high pressure and high temperature air in the combustion chamber in a high pressure and a spray state. The torque generated in the engine is determined by the amount of fuel burned and the combustion state. The ability to precisely control the amount of fuel injected into the combustion chamber is required to obtain power.

In addition, the performance of the engine is determined by the timing of the injection, the injection period, the injection angle, the injection rate, and the spray state (spray arrival, distribution, atomization, etc.) determine the formation of the mixer and the combustion pattern. Has a big impact on

Such a fuel injector has a single point injection (SPI) method of injecting fuel by collecting one or two fuel injectors in one place and installing them in an intake manifold, and installing one fuel injector at each intake port of each cylinder to supply fuel. It is divided into MPI (Multi Point Injection) method which injects fuel, and it controls the fuel injection amount of fuel injector by electronic electric pulse time, so it can improve engine performance as well as precise control of mixing ratio, distribution of good mixing ratio and exhaust gas It can reduce the harmful components of.

The fuel injectors of these fuel injectors have both ports, such as some Variable Valve Timing and Lean Burn Engines, so that only one side is used for low speed low load, and both ports are used for high speed high load. Since the fuel injection angle cannot be changed according to the engine conditions, the atomization of the mixer does not form the optimum condition because the inlet port is fixed to the center side of the intake port. Accordingly, many studies have been conducted to automatically set the injection angles of fuel injectors suitable for engine conditions.

FIG. 3 is a schematic view showing the configuration of a fuel injector for a vehicle of the prior art, and FIG. 4 is a cross sectional view in which the fuel injector of the prior art is mounted, and a fuel pump 2 for pumping fuel stored in the fuel tank 1. Is provided to communicate with one side of the delivery pipe 3 and the supply tube 5 with the fuel filter 4 interposed therebetween.

The delivery pipe 3 is provided with a fuel injector 8 fixed at a predetermined position so as to inject fuel into the intake port 7 formed in the cylinder head 6, and at the other side of the surge tank (not shown). A pressure regulator 9 for adjusting the fuel pressure of the delivery pipe 3 by negative pressure is provided so that the fuel pressure in the delivery pipe 3 is always maintained at a constant pressure.

In the intake port 7 described above, both ports 7a and 7b are formed like some variable valve timings and lean burn engines, and only one port 7a is used for low speed low load, and both ports 7a for high speed high load. 7b), the fuel injector 8 is located at the center of the intake port 7.

The pressure regulator 9 has a diaphragm (not shown) which is installed with an elastic member (not shown) and is installed in communication with the fuel tank 1 and the return tube 10 to provide fuel pressure of the delivery pipe 3. Upon increase, the fuel pressure is adjusted and then excess fuel is returned.

In the conventional fuel injection device for automobiles configured as described above, fuel stored in the fuel tank 10 is driven by the fuel pump 2 along the supply tube 5 by the engine to be supplied to the delivery pipe 3. When the fuel pressure is constantly maintained by the pressure regulator 9 provided to the delivery pipe 3 as well as by an output signal input to the ECU (electronic control unit) (not shown) according to the load state of the engine. By adjusting the electric pulse time to the fuel injector 8, each fuel injector 8 sequentially injects fuel, thereby achieving proper fuel injection according to the engine load conditions, but the injection angle according to the engine conditions. Since the fuel injection of the fuel injector 8 located at the center side of the intake port 7 is made to one port 7a because a dead zone is formed, the low speed low load The atomization of the mixing mixer is caused by the fact that the optimum conditions are not formed, and thus the output is lowered, fuel economy is increased, and the operability is inherent.

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to atomize the mixer by adjusting the angle of the fuel injector to automatically set the fuel injection angle that best suits the conditions of the engine It is to provide a fuel injector for an automobile that can be formed in an optimal state to increase the output of the engine, as well as to reduce fuel consumption and improve driving performance.

In order to realize the above object, the present invention provides a delivery, a variable valve timing provided in a pipe and separated into a high speed high-load port and a low speed low-load port formed in the cylinder head, and at the center of the intake port of the lean burn engine. In the MPI type vehicle fuel injector which is equipped with each fuel injector to inject the fuel according to the engine load condition, the delivery pipe and the intake port are flexible so that the fuel injection angle can be changed according to the engine condition. A fuel injector fixedly installed with a tube interposed therebetween, a delivery pipe inserted to guide the guide having the fuel injector fixed to the vehicle body, and a cylinder having a piston rod fixed to one side of the delivery pipe; The communication tank is installed on both sides of the cylinder, as well as the surge tank Automobile fuel injection consisting of a solenoid valve provided with a discharge tube communicating with the supply tube and discharged to the atmosphere, and an ECU which selectively outputs an electrical output signal according to the engine conditions so that the flow path of the solenoid valve is selectively switched. Provide the device.

The delivery pipe is characterized in that the elastic member is installed in a bullet so as to absorb the shock when guided to the guide.

A stopper for limiting the piston rod is provided inside the cylinder so as to preserve the initial state of the delivery pipe.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a view showing the configuration of the fuel injector for automobiles of the present invention, Figure 2 is a cross-sectional view of the fuel injector of the present invention is mounted, the configuration of the same parts as the prior art configuration is omitted in detail only important parts Explain.

The fuel injector 8 for injecting fuel into each intake port 7 formed in the cylinder head 6 has a flexible tube 20 in the intake port 7 and the delivery pipe 3 so that the fuel injection angle can be varied. 21 is interposed and fixed.

The delivery pipe 3 is inserted into a guide 22 fixed to a vehicle body (not shown) so as to be linearly moved by a piston rod of a cylinder to be described later.

The cylinder 24 having the piston rod 23 fixedly installed on one side of the delivery pipe 3 is divided into two chambers to linearly move the delivery pipe 3 according to the negative pressure of the cylinder 24. have.

The delivery pipe 3 is preferably installed elastically on one side so as to absorb the shock when guided to the guide 22 in accordance with the linear reciprocating motion of the piston rod (23).

The solenoid valve 25 installed in communication with both sides of the cylinder 24 is installed in communication with the surge tank 26 and the supply tube 28, and the discharge tube 29 for discharging into the atmosphere is provided to provide the solenoid valve 25. ), The piston rod 23 of the cylinder 24 is linearly reciprocated in accordance with the negative pressure of the surge tank 26 in accordance with the selective flow path change.

The stopper 31 which limits the piston rod 23 is provided inside the cylinder 24 so that the initial state of the delivery pipe 3 can be preserved.

The ECU 32 electrically connected to the solenoid valve 25 is configured to selectively switch the flow path of the solenoid valve 25 by selectively outputting an electrical output signal in accordance with engine conditions.

The fuel injector for automobiles of the present invention configured as described above is operated so that the fuel pump 2 pumps fuel stored in the fuel tank 1 to be supplied to the delivery pipe 3 through the supply tube 5. As a result, the pressure of the fuel supplied to the delivery pipe 3 is maintained at a constant fuel pressure by the pressure regulator 7 at all times.

At this time, the fuel injector 8 according to the operation of the engine is injected into the intake port 7 according to the time control of the electric pulse of the ECU 32 and mixed with the air flowing through the air cleaner (not shown) to each cylinder. It can be supplied to a good mixing ratio distribution can be obtained, as well as a good atomization state can be obtained.

However, in the low speed low load state, since one port 7b of the intake port 7 is closed and only the other port 7a is opened, the ECU 32 automatically adjusts the injection angle of the fuel injector 8 injected to the center side. From the solenoid valve 25 outputs a timely output signal.

Therefore, the flow path of the solenoid valve 25 is changed so that the coincidence of the surge tank 26 acts on the left chamber of the cylinder 24 via port a through port c of the solenoid valve 25, In the right chamber, the negative pressure of the cylinder is prevented as it is supplied to the right chamber of the cylinder 24 via the port b from the port d of the solenoid valve 25 through the discharge port 29 exposed to the atmosphere.

As the negative pressure of the surge tank 26 acts on the left chamber of the cylinder 24, the piston rod 23 is interlocked to guide the delivery pipe 3 to the guide 22 fixed to the vehicle body.

As the delivery pipe 3 is linearly guided to the guide 22, the fuel injector 8 provided in the delivery pipe 3 is connected by a flexible tube 20, 21, as shown by the dashed line in FIG. 2. As it is inclined at a predetermined angle, the path sprayed to the center side is switched from the α angle to the α 'angle, so that the atomizer can be well atomized when only one port 7a is used at low speed and low load, thereby increasing the engine output. As a result, fuel economy is reduced.

In this state, when the engine is switched to high speed and high load, the solenoid valve 25 is switched by the electrical output signal of the ECU 32 so that the negative pressure of the surge tank 26 acting on the cylinder 24 is changed from port b to port c. At the same time, air is supplied from the d port to the left chamber of the cylinder 24 through the a port a through the discharge tube 29 exposed to the atmosphere, thereby preventing the negative pressure of the cylinder 24 and providing the guide 22. Since the linearly moved delivery pipe 3 can maintain its initial state, fuel is injected to the center side of the intake port 7 to achieve good atomization of the mixer, thereby reducing engine output and fuel economy.

As described above, the injection angle of the fuel injector can be automatically adjusted according to the engine condition of the automotive fuel injector of the present invention, so that the atomization of the mixer can be improved, thereby improving engine output and improving fuel economy. Therefore, there is an advantage that can improve the operability.

Claims (3)

Some of the variable valve timing and intake port 7 of the lean burn engine provided in the delivery pipe 3 and separated into a low speed low load port 7a and a high speed high load port 7b formed in the cylinder head 6. In the fuel injector for automobiles of the MPI type in which each fuel injector 8 is mounted so as to be located at the center and injects fuel according to the load state of the engine, the delivery pipe may be changed so that the fuel injection angle may be changed according to the engine conditions. (3) and the fuel injector 8 fixedly installed with the flexible tubes 20 and 21 interposed between the intake port 7 and the fuel injector 8 described above and guided to the guide 22 fixed to the vehicle body. The communication pipe 3 is inserted into the delivery pipe 3, the cylinder 24 holding the piston rod 23 fixedly installed on one side of the delivery pipe 3, and the communication pipe is installed on both sides of the cylinder 24. Tank (26) and ball The solenoid valve 25 communicating with the tube 27 and exposed to the atmosphere is selectively electrically connected to the conditions of the engine so that the flow path of the solenoid valve 25 is selectively switched. Automotive fuel injector, characterized in that consisting of an ECU (32) for outputting the output signal. 2. The fuel injector according to claim 1, wherein the delivery pipe (3) is elastically installed (30) to absorb shock when guided to the guide (22). 2. A fuel injector according to claim 1, characterized in that a stopper (31) is provided inside the cylinder (24) to limit the piston rod (23) so as to preserve the initial state of the delivery pipe (3).