KR20160141282A - Evaluation device of mechanical fuel injection - Google Patents

Abstract

The present invention relates to a power generating apparatus comprising a power generating unit generating a rotational force by an external power source, a power switching unit that receives a rotational force generated by the power generating unit and converts the rotational motion into a linear reciprocating motion, And a fuel injection unit for injecting the fuel supplied from the fuel supply unit in a linear reciprocating motion of the power switching unit at a high pressure so as to inject the diesel fuel as well as a new alternative fuel such as biodiesel It is possible to use it and realize fuel temperature and injection system in an environment similar to actual use environment, and it is possible to perform durability evaluation by enabling operation of injection pump and injector under certain conditions for a long time, Optimum injector nozzle tip design conditions corresponding to alternative fuels have been derived and are available for new alternative fuels And it is provided with a mechanical fuel injection system evaluation that can activate the response of the injector design key technology promotion and development of new products.

Description

TECHNICAL FIELD [0001] The present invention relates to an evaluation device for mechanical fuel injection,

The present invention relates to a nozzle tip optimum design condition of an injector for commercial use of a new alternative fuel. In order to carry out the quality and durability test of the injection pump and the injector above the condition, To a mechanical fuel injection evaluation device which improves reliability in durability evaluation.

Generally, a fuel injection device of a diesel engine can be classified into an electronically controlled fuel injection device and a mechanical fuel injection device according to a control method.

The electronically-controlled fuel injection device includes a high-pressure fuel pump, a common rail that pressurizes the fuel to be fed to the high-pressure fuel pump at a certain pressure, an injector that injects the fuel supplied from the common rail into the cylinder, , An encoder and a pressure sensor, and an engine control unit which receives information on the engine operating state from various sensors or instruments and controls the injection timing, the injection amount, the injection pressure, and the injection rate of the fuel injected from the injector. Injection devices are mainly used.

Unlike the mechanical fuel injection device, the electronically controlled fuel injection device can control the fuel injection timing, the injection amount, the injection pressure, and the injection rate independently of the operation conditions of the engine. Therefore, (PM), soot, and the like. In the case of a small-sized passenger diesel engine, a common rail fuel injection device is generally used.

On the other hand, the mechanical fuel injection device has injection pumps for each cylinder of the engine, and each injection pump is operated by the cam of the camshaft interlocked with the engine, and the fuel is injected through the high pressure pipe into the injector, And the fuel injection amount is controlled according to the engine speed or the load.

The injector is mounted on a fuel supply portion of the engine and automatically supplies an appropriate amount of fuel required for engine operation to the engine combustion chamber, and plays a very important role in engine performance.

That is, when the amount of fuel is less than the reference amount or the amount of fuel is larger than the reference amount or the angle of spraying from the nozzle is irregular, the operation of the engine is unstable, leading to a decrease in output during driving, Not only is the fuel consumption greatly increased, but also the air pollution is increased due to excessive exhaust gas, which causes inconvenience due to bad starting, and it may cause engine stoppage and shortening the life span of the vehicle during operation.

It is common to check one of the most suspicious parts one by one because it is difficult to determine the defect of the injector due to a few symptoms because there are quite a lot of abnormal symptoms that appear as defects of the injector and similar to the symptoms of other parts. The degree of contamination of the hole and the degree of contamination are visually checked to determine whether the defect is defective. However, since accurate diagnosis can not be made, inefficient vehicle maintenance such as disassembling, replacing, or cleaning all the components causing the same symptom There was a problem to be done.

In order to solve such a problem, in Patent Document 10-0750716 (Aug. 13, 2007), a plurality of injectors, which are supplied with test oil from a common rail, are mounted on a fixed base provided at one side of a fixed body, And a storage tank for storing a test oil is provided at a lower portion of the injector, wherein the injector is provided with a lamp for indicating an abnormality of the electric signal system in the injector by applying an operation signal to the injector A plurality of injectors for receiving test oil injected from the plurality of injectors are installed in a lower portion of the fixing table, and a reverse discharge amount measuring unit for measuring the test oil discharged in reverse is installed in the injector Wherein the diameter of the inlet is smaller than the inlet of the discharge volume measuring cylinder Wherein the discharge port is formed so as to face the inlet of the discharge volume measuring cylinder, and the reverse discharge amount measuring section includes a reverse discharge pipe connected to the inlet side of the injector for leading the test oil to the one side, And an inverse discharge amount measuring cylinder for measuring the back discharge amount of the test oil.

The present invention enables the use of new alternative fuels such as biodiesel as well as diesel fuel, realizes the temperature and injection system of the fuel in an environment similar to the actual operating environment, and operates the injection pump and the injector for a long time under certain conditions Based on long-term durability evaluation, optimum injector nozzle tip design conditions corresponding to new alternative fuel are derived, and high-response injector design corresponding to new alternative fuel is possible. Development of core technology and development of new product Which can activate the mechanical fuel injection valve.

The mechanical fuel injection evaluation apparatus according to the present invention comprises a power generating unit for generating a rotational force by an external power source, a power switching unit for receiving the rotational force generated by the power generating unit and converting the rotational motion into a linear reciprocating motion, And a fuel injection unit for injecting the fuel supplied from the fuel supply unit at a high pressure in a linear reciprocating motion of the power switching unit and injecting fuel at a high temperature, The quality and durability tests for pumps and injectors can be conducted.

The power generating unit according to the present invention includes an electric motor for generating a rotational force by rotating a rotary shaft by an external power source, a first belt pulley provided on a first rotary shaft connected to the rotary shaft of the electric motor by a joint, .

The power switching unit according to the present invention may include a second belt pulley connected to the first belt pulley by a belt and coupled to the second rotation shaft at the center thereof and a second belt pulley formed on one side of the second belt pulley, And a camshaft box connected to the second rotation shaft by a joint and converting the rotational motion of the second rotational shaft into a linear reciprocating motion.

The fuel supply unit may include a fuel tank for containing the fuel, a fuel pump connected to the fuel tank through a pipe through which the fuel flows, for pumping and supplying fuel according to a control signal of the control unit, Fuel heating means provided at one side of the fuel tank for warming the fuel contained in the fuel tank to a predetermined temperature by control of a control unit based on the fuel temperature set in the control unit; A fuel cooling water step that cools the fuel contained in the fuel tank to a corresponding temperature by a control signal of a control unit based on a temperature set in the control unit, And a first thermocouple and a second thermocouple that measure the temperature of the first thermocouple.

In addition, the fuel injection unit according to the present invention is mounted on the upper portion of the camshaft box. The fuel injected by the fuel injection unit moves up and down the piston by the cam rotation of the camshaft rotating in the camshaft box, A relief valve provided at one side of the injection pump and opened when the fuel pressure of the injection pump is higher than the designated pressure when the fuel is switched to a high pressure to regulate the pressure; An injector connected to the injection pump and a high-pressure pipe through which a high-pressure fuel flows, for injecting the high-pressure fuel output from the injection pump, and an injector provided at each of the fuel input side, the fuel output side, and the injector of the injection pump, A third thermocouple, a fourth thermocouple, and a fifth thermocouple that measure the temperature of the fuel, the temperature of the high-pressure fuel to be discharged, and the temperature of the fuel to be injected, A first pressure sensor provided at one side of the reef valve for measuring a pressure of the high-pressure fuel sent to the relief valve, and a second pressure sensor provided at one side of the injector for measuring a pressure of fuel injected from the injector .

The mechanical fuel injection evaluation apparatus according to the present invention is capable of using a new alternative fuel such as biodiesel as well as diesel fuel and realizing fuel temperature and injection system in an environment similar to actual use environment, It is possible to evaluate the durability because it can be operated for a long time under a certain condition. Therefore, based on the evaluation of durability for a long time, optimum design conditions of injector nozzle tip corresponding to new alternative fuel are derived, It has the effect of promoting core technology and developing new products.

1 is an exemplary diagram showing a configuration of a mechanical fuel injection evaluation apparatus according to the present invention.
2 is a diagram showing an example of the configuration of a mechanical fuel injection evaluation apparatus according to the present invention.
3 is an exemplary view showing an organic relation between a camshaft box and a jet pump according to the present invention.
4 is an exemplary view showing an installation state of an injector according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

FIG. 1 is a schematic view showing the construction of a mechanical fuel injection evaluation apparatus according to the present invention. FIG. 2 is a view showing the construction of a mechanical fuel injection evaluation apparatus according to the present invention. FIG. 4 is an exemplary view showing an installation state of the injector according to the present invention. FIG.

The present invention relates to a nozzle tip optimum design condition of an injector for commercial use of a new alternative fuel. In order to carry out the quality and durability test of the injection pump and the injector above the condition, The present invention relates to a mechanical fuel injection evaluation apparatus that improves reliability in durability evaluation by applying the fuel injection control apparatus of the present invention.

1 and 2, the mechanical fuel injection evaluation apparatus according to the present invention includes a power generation unit 100, a power switching unit 200, a fuel supply unit 300, and a fuel injection unit 400, The power generating unit 100, the power switching unit 200, and the fuel supplying unit 300 are disposed on the top, bottom, and one sides of the body frame 10, which is the body of the mechanical injection evaluation apparatus, It is preferable that the fuel injecting unit 400 is composed of individual entities.

This is for the purpose of making the supply condition of the fuel supplied to the injector 430 constant and replacing the injector 430 easy.

Among the above components, the power generating unit 100 is disposed on the lower side of the body frame 10 of the mechanical injection evaluation apparatus, and generates a rotational force by an external power source.

1 and 2, the power generating unit 100 includes an electric motor 110 and a first belt pulley 120. The electric motor 110 is a power source provided from the outside, So that a rotational force is generated.

At this time, the electric motor 110 is preferably formed of an alternating-current motor, and the rotational speed RPM is controlled by an inverter (not shown) electrically connected to the control unit 500.

The first belt pulley 120 is provided on a first rotary shaft 101 connected to a rotary shaft of the electric motor 110 by a joint 102 and rotated.

At this time, bearing members are provided on the front and rear sides of the first rotation shaft 101 with the first belt pulley 120 as the center, so that the first rotation shaft 101 is horizontally supported and rotated easily The first rotary shaft 101 is connected to the rotary shaft of the electric motor 110 by the joint 102 and the first rotary shaft 101 is rotated when the rotary shaft of the electric motor 110 rotates under the control of the control unit, And as the first rotation shaft 101 rotates, the first belt pulley 120 rotates.

The rotational force of the power generating unit 100 is transmitted to the power switching unit 200. The power switching unit 200 is disposed on the upper surface of the body frame 10 of the mechanical injection evaluating apparatus, And the rotary motion is converted into a linear reciprocating motion and supplied.

1 and 2, the power switching unit 200 includes a second belt pulley 210 and a camshaft box 230. The first and second belt pulleys 210 and 230 The belt pulley 210 is connected to the first belt pulley 120 of the power generating unit 100 by a belt and the second rotation shaft 201 is coupled to the center of the belt pulley 210, And rotates the second rotary shaft 201. [0054]

At this time, it is preferable that the rotational speed of the first belt pulley 120 and the second belt pulley 210 is reduced to 1/4 at a gear ratio of 1: 4.

The second rotary shaft 201 is also provided with bearing members on the front and rear sides of the second rotary shaft 201 with the second belt pulley 210 as the center and horizontally supporting the second rotary shaft 201 And at the same time, rotation is facilitated.

Further, a flywheel 220 is provided on one side of the second belt pulley 210 to further apply inertia so that the flywheel 220 maintains the rotational force on the second rotation shaft 201, thereby reducing unbalance of rotation .

In addition, an encoder (not shown) may be provided at one end of the second rotation shaft 201 so that the rotation speed RPM of the second rotation shaft 201 is stored along with time.

The camshaft box 230 is connected to the second rotary shaft 201 by a joint 202 and converts the rotary motion into a linear reciprocating motion by the rotational force of the second rotary shaft 201.

3, the cam shaft 231 is connected to the second rotation shaft 201 by a joint 202, and the cam shaft 231 is connected to the second rotation shaft 201 by a joint 202 The piston of the injection pump is linearly reciprocated by the rotational motion of the eccentric cam formed on the cam shaft 231 by receiving the rotational force of the second rotational shaft 201 through the joint 202, Is converted into a linear reciprocating motion.

Also, in the camshaft box 230, the lubricating oil is circulated for the purpose of smoothly rotating the camshaft 231 and reducing the mechanical frictional force between the cam and the piston of the camshaft 231, or dispersing frictional heat generated from the frictional surface And an oil tank 241 connected to the camshaft box 230 through an oil circulation pipe through which lubricating oil flows and accommodating the lubricating oil. The oil circulation pipe 241 is connected to one side of the oil tank 241, An oil pump 242 is provided on the pipe to pump the lubricating oil according to the control signal of the control unit so as to circulate along the oil circulating pipe.

The oil tank 241 is connected to one side of the oil tank 241 by a control signal applied from a control unit on the basis of the temperature set in the controller 500 to preheat the lubricating oil stored in the oil tank 241 to the corresponding temperature And an oil cooling means 244 for cooling the oil contained in the oil tank 241 to a predetermined temperature by a control signal applied from the control unit 500 based on the temperature set in the control unit 500 .

The oil heating means 243 and the oil cooling means 244 are connected to the sixth thermocouple 245 and the seventh thermocouple 246 respectively provided on the oil input side and the output side of the oil tank 241, And the temperature of the lubricating oil measured by the eighth thermocouple 247 provided on the oil input side of the first thermocouple 244 is controlled.

Accordingly, in order to smoothly rotate the camshaft 231 and reduce the mechanical frictional force between the cam and the piston of the camshaft 231, or disperse the frictional heat generated from the friction surface, the lubricant is supplied from the oil tank 241 to the oil pump 242 to the camshaft box 230. The lubricating oil convected through the camshaft box 230 is sent to the oil cooling means 244 and then circulated to the oil tank 241 again.

The oil heating means 243 and the oil cooling means 244 may be controlled based on the temperature of the lubricant measured by the sixth thermocouple 243, the seventh thermocouple 244 and the eighth thermocouple 245 .

As shown in FIGS. 1 and 2, the fuel supply unit 300, which supplies the fuel to be converted to a high pressure by the linear reciprocating motion converted from the rotational motion by the power switching unit 200, The fuel tank 310 and the fuel pump 320 are connected to each other through a pipe through which the fuel flows and the fuel contained in the fuel tank 310 is supplied to the fuel tank 310 in accordance with the control signal of the control unit 500 Pumped and supplied.

At this time, a fuel heating means 330 is provided at one side of the fuel tank 310. The fuel heating means 330 is driven by a control signal applied from the control unit 500 based on the temperature set in the control unit 500 So that the fuel contained in the fuel tank 310 can be preheated to the corresponding temperature.

A fuel cooling means 340 is disposed on one side of the fuel tank 320. The fuel cooling means 340 is connected to the fuel tank 320 through a pipe through which the fuel flows, And is driven by a control signal applied from the control unit 500 on the basis of the temperature to cool the fuel contained in the fuel tank 320 to a corresponding temperature.

The fuel tank 320 and the fuel cooling unit 340 are provided with a first thermocouple 321 and a second thermocouple 341 to measure the temperature of the fuel.

The fuel supplied from the fuel supply unit 300 is converted into high pressure through the fuel injection unit 400 and then injected.

1 and 2, the fuel injector 400 includes an injection pump 410, a relief valve 420, and an injector 430. The fuel injector 400 includes an injection pump 410, a relief valve 420, The injector pump 410 is preferably mounted on the upper portion of the camshaft box 230 so as to be connected to the camshaft box 230 in a mutual manner. The piston of the injection pump 410 is directly lifted and lowered to reciprocate the cylinder of the injection pump 410. The supplied fuel is converted to a high pressure and then the high pressure fuel is discharged.

At this time, the discharged high-pressure fuel is sent to the injector 430, and a relief valve 420 is provided at one side of the injection pump 410. The relief valve 420 controls the injection pump 410, In the case of switching, if the pressure is switched to a higher pressure than the specified pressure, open it to lower the pressure.

In the present invention, it is preferable that a part of the high-pressure fuel is returned to the fuel tank 320 side through the relief valve 420 to regulate the pressure.

As shown in FIGS. 2 and 4, the injector 430 is preferably fixed to a platform 431 whose height is controlled by a separate entity, and the injection pump 410 and the high- And injects high-pressure fuel which is converted into high pressure by the injection pump 410 and is output.

At this time, the fuel injected from the injector 430 may be collected in the lower portion of the injector 430, and the fuel may be sent to the fuel tank 320 again.

The injection pump 410 is provided with a third thermocouple 441, a fourth thermocouple 442 and a fifth thermocouple 443 on the fuel input side, the fuel output side and the injector 430, The temperature of the fuel compressed by the high pressure and the temperature of the fuel to be injected are respectively measured and the relief valve 420 is provided with a first pressure sensor 451, The pressure of the high-pressure fuel sent to the relief valve 420 is measured.

In addition, a second pressure sensor 452 is provided at one side of the injector 430 to measure the pressure of the fuel injected from the injector,

When the needle valve ascends and descends along the hollow of the injector 430, the high-pressure fuel is injected through the injector nozzle tip. At this time, the up-and-down movement of the needle valve is detected by the proximity sensor 432, And the number of times of injection is calculated through the counter and stored in the control unit 500.

Therefore, according to the mechanical fuel injection evaluation apparatus of the present invention, the quality and durability test of the injection pump and the injector can be carried out under the actual fuel temperature condition according to the above-described configuration, so that not only diesel fuel but also new alternative fuel such as biodiesel It is possible to use it and realize fuel temperature and injection system in an environment similar to actual use environment, and it is possible to perform durability evaluation by enabling operation of injection pump and injector under certain conditions for a long time, Optimal injector nozzle tip design conditions corresponding to alternative fuels can be derived to promote the development of high-response injector design core technologies and new products corresponding to new alternative fuels

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Body frame 100: Power generating unit
101: first rotating shaft 102: joint
110: electric motor 120: first belt pulley
200: Power switching unit 201: Second rotating shaft
210: second belt pulley 220: flywheel
230: Camshaft box 231: Camshaft
241: Oil tank 242: Oil pump
243: Oil heating means 244: Oil cooling means
245: sixth thermocouple 246: seventh thermocouple
247: Eighth thermocouple 300: fuel supply unit
310: Fuel tank 320: Fuel pump
330: fuel heating means 340: fuel cooling means
321: first thermocouple 341: second thermocouple
400: fuel injector 410: injection pump
420: relief valve 430: injector
441: Third thermocouple 442: Fourth thermocouple
443: fifth thermocouple 451: first pressure sensor
452: second pressure sensor 500:

Claims (5)

A power generating unit generating a rotational force by an external power source;
A power switching unit that receives the rotational force generated by the power generating unit and converts the rotational motion into a linear reciprocating motion;
A fuel supply unit for supplying fuel to be converted to a high pressure by a linear reciprocating motion of the power switching unit; And
And a fuel injecting portion for injecting the fuel supplied from the fuel supplying portion into the fuel injecting portion at a high pressure in a linear reciprocating motion of the power switching portion so as to perform quality and durability tests on the injection pump and the injector under actual use temperature conditions. Device.
The method according to claim 1,
The power-
An electric motor for generating a rotational force by rotating a rotary shaft by an external power source;
And a first belt pulley provided on a first rotational shaft connected to a rotational shaft of the electric motor by a joint and rotated.
The method of claim 2,
The power-
A second belt pulley connected to the first belt pulley by a belt, the second belt pulley coupled to the second rotation shaft at the center;
A flywheel formed on one side of the second belt pulley and further applying inertia to the second rotation shaft;
And a camshaft box connected to the second rotation shaft by a joint so as to convert the rotational motion of the second rotational shaft into a linear reciprocating motion.
The method according to claim 1,
The fuel supply unit
A fuel tank for containing the fuel;
A fuel pump connected to the fuel tank through a pipe through which fuel flows, for pumping fuel according to a control signal of the control unit;
Fuel heating means provided at one side of the fuel tank and preheating the fuel contained in the fuel tank to a corresponding temperature by control of a control unit based on the fuel temperature set in the control unit;
A fuel coolant stage which is disposed at one side of the fuel tank and is connected to a pipe through which fuel flows and cools the fuel contained in the fuel tank to a corresponding temperature by a control signal of a control unit based on a temperature set in the control unit;
And a first thermocouple and a second thermocouple provided in the fuel tank and the fuel cooling means, respectively, for measuring the temperature of the fuel.
The method of claim 3,
The fuel injection unit
A injection pump mounted on the upper portion of the camshaft box for switching the fuel supplied to the piston up and down by the cam rotation of the camshaft rotating in the camshaft box to a high pressure and then discharging the converted high- ;
A relief valve provided at one side of the injection pump for opening and regulating the pressure when the injection pressure of the fuel is higher than a designated pressure when the fuel is switched to high pressure;
An injector connected to the injection pump and a high-pressure pipe through which high-pressure fuel flows, for injecting high-pressure fuel output from the injection pump;
A third thermocouple, a fourth thermocouple, and a third thermocouple, which are respectively provided on the fuel input side, the fuel output side, and the injector of the injection pump and measure the temperature of the fuel input to the injection pump, the temperature of the discharged high- A fifth thermocouple;
A first pressure sensor disposed at one side of the relief valve and measuring a pressure of the high-pressure fuel sent to the relief valve;
A second pressure sensor provided at one side of the injector for measuring a pressure of fuel injected from the injector;
And a second pressure sensor provided at an upper side of the injector for measuring a pressure of fuel injected from the injector.

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