KR20050005599A - A adapter for repairing engine, A system and method for measuring explosive pressure of engine cylinder - Google Patents

Abstract

PURPOSE: An adapter for repairing an engine, a system and a method for measuring the explosive pressure of an engine cylinder are provided to analyze errors relating to pressure in the engine cylinder by one action. CONSTITUTION: An adapter(200) for repairing an engine includes a body and an ignition generating body. The body delivers pressure of a cylinder to the side of a pressure sensor(100). The ignition generating body generates ignition by discharging electric in the cylinder. The body has a pressure passage allowing the pressure in the cylinder to be delivered to the pressure sensor(100). The body includes a fluid passage forming part, a coupling part, and a sealed case. The fluid passage forming part has at least one fluid passage groove or/and a fluid passage hole forming the pressure passage. The coupling part couples the fluid passage forming part with the cylinder.

Description

A adapter for repairing engine, A system and method for measuring explosive pressure of engine cylinder}

The present invention relates to an engine maintenance adapter, a system and a method for measuring the explosion pressure of an engine cylinder, and more specifically, an engine maintenance adapter for improving the sophistication and simplicity of an engine maintenance, and an explosion pressure of an engine cylinder. System and method.

In general, the combustion chamber pressure (hereinafter referred to as the pressure in the cylinder) of the cylinders provided in various engines including automobiles is closely related to the driving force of the engine, and the above pressures in the cylinders reduce the driving efficiency of the engine, noise and vibration, fuel This may cause engine trouble such as excessive smoke generation due to incomplete combustion.

These pressure abnormalities in the cylinder include fuel system abnormalities including defects in the injector for injecting fuel into the cylinders, ignition system abnormalities including spark plugs and ignition timings, valve failures, and cylinder or piston wear, etc. It is caused by an abnormality of the compression system including a.

As a technique for measuring the compression pressure in the cylinder to determine the cause of the pressure abnormality in the cylinder, that is, the engine abnormality, the compression pressure measuring apparatus and method in the cylinder disclosed in Korean Patent Publication No. 2001-0064431 (Inventor Choi In Ho) There are a number of documents that disclose similar prior arts and the like.

However, according to the prior art, there have been the following problems.

First, as shown in FIG. 2 of Korean Patent Laid-Open Publication No. 2001-0064431, an adapter (24, which is a simple hollow tube shape) coupled to an engine by replacing a spark plug serves to deliver pressure in a cylinder to a pressure sensor 20 only. As a result, the operator could only measure the pure compression pressure but not the actual explosion pressure with the fuel cutoff and ignition cutoff in the cylinder. On a comprehensive basis, the basic driving principle of all engines is the force of the explosion pressure generated by the explosion of the mixed gas in the cylinder. As such, many sensors and components are provided to ensure that the mixed gas in the cylinders that make up the engine can cause an appropriate explosion. Therefore, in order to fundamentally understand the cause of the engine failure, it is necessary to accurately measure the actual explosion pressure in the cylinder. In other words, it is important to know the actual pressure change in the cylinder during one stroke, the intake compression explosion exhaust in the cylinder. However, the above-described prior art can only determine whether there is an abnormality in the compression system, but there is a clear limitation in directly identifying the exact cause of the engine abnormality.

Second, when the compression pressure is measured by the prior art as described above, if there is no abnormality in the compression pressure, expensive tuning equipment should be used to check the abnormality of the ignition system, which is another cause of the abnormal pressure in the cylinder. Because of this, the cost of maintenance supplies rises, and there is a problem in that a high level of knowledge is required to analyze data output using such tuning equipment.

Third, when there are no problems with the compression system and the ignition system, there has been a hassle to separate and examine the injector to check the fuel system.

Therefore, there was a problem that the cost of maintenance supplies and maintenance fees, the difficulty of maintenance and workability, and the increase of maintenance time.

Disclosure of Invention The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an engine maintenance adapter capable of analyzing the compression abnormality in a cylinder at a glance, and a system and method for measuring the explosion pressure of an engine cylinder. .

1 is a schematic diagram showing a setting state of a system that can measure the explosion pressure of the engine cylinder according to an embodiment of the present invention.

2A and 2B are engine maintenance adapters according to an embodiment of the present invention applied to a system capable of measuring the explosion pressure of the engine cylinder of FIG.

FIG. 3 is a flowchart of a method of measuring an explosion pressure of an engine cylinder using the cylinder pressure measuring system of the engine of FIG. 1.

4A to 4C are graphs comparing the cylinder pressure waveforms in the steady state and the cylinder pressure waveforms in the abnormal state for each situation.

5 is a schematic diagram of a system required for engine operation.

* Description of the symbols for the main parts of the drawings *

100: pressure sensor 200: adapter

20a, 20b: main body 21a, 21b: flow path forming portion

22a, 22b: coupling part 23a, 23b: hermetic casing

30a, 30b: Purification derivatives 31a, 31b: High pressure stage

32a, 32b: low voltage terminal 33a, 33b: high voltage terminal

34a, 34b: Connection 1: Euro groove

2: Euro ball 300: output device

Therefore, the engine maintenance adapter according to the present invention for achieving the above object, the body for transmitting the pressure in the cylinder to the pressure sensor side; And an ignition derivative capable of causing ignition by electric discharge in the cylinder. Characterized in that it comprises a.

In addition, the main body is characterized in that it further has a pressure passage that allows the pressure in the cylinder to be delivered to the pressure sensor side.

The main body may include a flow path forming part in which at least one flow path groove or / and flow path forming the pressure flow path is formed, a coupling part for fixing the flow path forming part to the cylinder, and the at least one flow path groove or / and flow path. Another feature is to include a closed casing to block the pressure transmitted from the ball to the pressure sensor side to the outside and to move to the pressure sensor side.

In addition, the closed casing is another feature of being a non-conductor.

The ignition conductor may include an ignition unit which induces electric discharge by a voltage difference between the high voltage terminal and the grounded low voltage terminal, causing ignition in the cylinder, a high voltage terminal connected to a high voltage side of a predetermined power source, and the high voltage terminal and the high voltage. Another feature is to include a connection for connecting the terminals.

In addition, the ignition unit is another feature that is fixedly coupled to the body.

In addition, a system capable of measuring the explosion pressure of the engine cylinder according to the present invention for achieving the above object, the pressure sensor for sensing the pressure; An adapter for transmitting pressure in the cylinder to the pressure sensor and causing ignition by electric discharge in the cylinder; And an output device for outputting the pressure sensed by the pressure sensor as data. Characterized in that it comprises a.

In addition, the system capable of measuring the explosion pressure of the engine cylinder according to the present invention for achieving the above object, replacing the spark plug coupled to the cylinder of the engine with the adapter of any one of claims 1 to 5. ; Connecting between the adapter, a power supply, and a pressure sensor, and an output device that outputs the pressure sensed by the pressure sensor and the pressure sensor as data; Starting the engine; Detecting the pressure in the cylinder generated by the operation of the engine by the pressure sensor; And outputting the sensed pressure as data by the output device. Characterized in that it comprises a.

In addition, when the engine is made of a multi-cylinder is characterized by performing all the above steps in a state in which the pressure of the other cylinder selectively released to measure the pressure in a particular cylinder.

In addition, it is another feature to measure the pressure in the cylinder while adjusting the number of revolutions of the engine.

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

1 is a schematic diagram of a system capable of measuring the explosion pressure of an engine cylinder according to an embodiment of the present invention.

Referring to FIG. 1, a cylinder pressure measurement system of an engine according to the present embodiment includes a pressure sensor 100 capable of detecting a pressure (hereinafter, referred to as an explosion pressure) generated by an actual explosion of a mixed gas in a cylinder. And, the explosion pressure sensed from the adapter 200 and the pressure sensor 100 which transmits the explosion pressure in the cylinder of the engine 500 to the pressure sensor 100 side and may cause ignition by electric discharge in the cylinder. It comprises an output device 300 for outputting the data, the amplifier 400 provided between the pressure sensor 100 and the output device 300.

On the other hand, Figure 2a is a cutaway perspective view of the engine maintenance adapter 200a according to a specific embodiment of the present invention that can be applied to a system capable of measuring the explosion pressure of the engine cylinder shown in FIG.

Referring to FIG. 2A, the engine maintenance adapter 200a according to the present embodiment may cause ignition due to electric discharge in the main body 20a and the cylinder, which largely transmit the pressure in the cylinder to the pressure sensor 100. It is configured to include an ignition inductor (30a).

In addition, the main body 20a may include a flow path forming portion 21a made of an insulator material having four flow path grooves 1 constituting a pressure flow path for transmitting the pressure in the cylinder to the pressure sensor 100, and formed on an outer circumferential side thereof. The flow path is formed by surrounding the outer circumference of the coupling part 22a and the flow path forming part 21a that can be screwed in place of the place where the spark plug is coupled in the cylinder to fix the forming part 21a to the cylinder. It extends to the rear side of the portion (21a) includes a closed casing (23a) to block the pressure transmitted through the four flow path groove (1) to the outside and to move to the pressure sensor 100 side. Here, the four flow path grooves 1 and the inside of the hermetic casing 23a form a pressure flow path through which the pressure in the cylinder is transferred to the pressure sensor 100.

In addition, the ignition inductor 30a induces an electrical discharge by mutually high voltage difference to cause ignition of the mixed gas (gas mixed with fuel and air at a predetermined ratio) in the cylinder, and the flow path forming portion 21a. An ignition unit including a high voltage stage 31a fixedly coupled to the front end of the front end of the cylinder and protruding into the cylinder, and a low pressure stage 32a grounded V ^_ by being fixedly coupled to the front end of the coupling unit 22a, and a predetermined power source ( Taking a vehicle as an example, it may be a power source in the vehicle itself in need of maintenance, or a high voltage terminal connected to the high voltage side (V ⁺ ) of another vehicle or a standardized external power source provided for maintenance. 33a) and a connecting portion 34a for connecting the high voltage terminal 31a and the high voltage terminal 33a to each other. In addition, the connecting portion 34a is connected to the high pressure terminal 31a in a state in which the insulator is formed in the flow path forming portion 21a and exits to one side of the hermetic casing 23a so as to be connected to the high voltage terminal 33a. Connected.

Here, where the interference between the connecting portion 34 (high voltage end and isopotential because it is connected to the high voltage side) and the sealed casing (23a (low voltage end and isopotential because it is grounded)) is insulated since sparks may occur due to electrical discharge. It is desirable to lose. For example, the hermetic casing 23a is a non-conductor and has a high hardness plastic material that can withstand the explosion pressure, or a portion of the connection portion 34a where interference with the hermetic casing 23a is made of a dielectric material having a high dielectric breakdown strength. Wrapped by a tube (when the sealed casing is a conductor material). In addition, the site where interference between the connecting portion 34a and the hermetic casing 23a has a strong sealing force to withstand the high pressure caused by the explosion of the mixed gas in the cylinder to secure the hermetic sealing of the hermetic casing 23a. .

Figure 2b shows an engine maintenance adapter 200b according to another embodiment of the present invention.

Referring to FIG. 2B, the engine maintenance adapter 200b according to the present embodiment may likewise have an electric discharge to the main body 20b for transmitting the pressure in the cylinder to the pressure sensor 100 and the mixed gas in the cylinder. It is configured to include an ignition conductor (30b) that can cause ignition.

In addition, the main body 20b has a flow path forming portion 21b made of an insulator material having four flow path holes 2 constituting the pressure flow path and a front end of the flow path forming portion 21b fixedly coupled to the cylinder. In order to be coupled to the coupling portion 22b and the rear end of the flow path forming portion 21b which can be screwed to the place where the spark plug of the cylinder is coupled to extend to the rear side of the flow path forming portion 21b and the four flow path holes It includes a closed casing (23b) to block the pressure transmitted through the (2) to the outside and to move the pressure to the pressure sensor 100 side. Here, the four flow path holes 2 and the inside of the hermetic casing 23b form a pressure passage for transmitting the pressure in the cylinder to the pressure sensor 100.

In addition, the ignition conductor 30b is fixedly coupled to the shear center of the flow path forming portion 21b to protrude into the cylinder to induce electric discharge by a high voltage difference in the cylinder to cause ignition in the cylinder. The high voltage stage 31b and the ignition portion including a low voltage stage 32b grounded by being fixedly coupled to the front end of the coupling portion 22b, a high voltage terminal 33b connected to the high voltage side of a predetermined power source, and the high voltage stage. 31b and a connecting portion 34b for connecting the high voltage terminal 33b. In addition, the connection part 34b is connected to the high pressure terminal 31b in a state in which the insulator is formed in the flow path forming part 21b, and exits to one side of the flow path forming part 21b to the high voltage terminal 33b. Connected with

As described above, the engine maintenance adapter 200b of FIG. 2B is characterized in that the material of the airtight casing 23b is in any case because the connection portion 34b and the airtight casing 23b do not cause electrical interference with each other. It does not matter much, and the connection portion 34b does not affect the sealing force of the hermetic casing 23b.

On the other hand, in Fig. 2a or 2b, since the flow path groove 1 and the flow path hole (2) may be appropriately passed through pressure, it is preferable that at least one is formed, according to the embodiment the flow path groove or the flow path groove It may be comprised together with a flow path formation part.

Figure 3 is a method for measuring the pressure in the cylinder using a system capable of measuring the explosion pressure of the engine cylinder of Figure 1, a flow chart of a method for measuring the explosion pressure of the engine cylinder according to an embodiment of the present invention to be.

With reference to this, the method of measuring the pressure of the engine cylinder performed in actual engine maintenance work or engine inspection and inspection, etc. will be described with numbers.

1. Replace the spark plug coupled to the cylinder of the engine with the engine maintenance adapter (200a, 200b) (301).

2. The engine maintenance adapters 200a and 200b, a power supply, a pressure sensor 100, an amplifier 400, and an output device 300 are interconnected to set a system for engine maintenance (302).

Of course, the steps 1 and 2 may be changed in order according to the convenience or the need of the work.

3. Actually start the engine (303).

4. The explosion pressure in the cylinder generated by the operation of the engine is detected by the pressure sensor 100 (304).

5. The detected explosion pressure is output as data by the output device 300 (305).

6. By analyzing the output data, the cause of the engine abnormality is traced (306).

4A to 4C are various situations in which data on the pressure change in the cylinder during one stroke of the suction compression explosion expansion exhaust output in the above process are shown by a graph having a time axis (T axis) and a pressure axis (P axis). Is showing.

The curve 1 shown in Figs. 4A to 4C shows the change in pressure in a normal cylinder.

Ignition is ahead of time when the maximum pressure due to explosion of the mixed gas is generated. That is, the ignition at the point t seconds in the graph's time axis is the normal reference ignition point. If an abnormality occurs in the ignition system, a distortion of the pressure waveform occurs due to an abnormal ignition time or poor contact of the power input line at the reference ignition time t as shown in the curve 2 of FIG.

In addition, when there is a problem in the fuel system such as insufficient fuel supply (clogged nozzle) or when the supply point is inappropriate, the same pressure curve as in the normal state ① before the ignition point is obtained. After ignition, the maximum pressure due to explosion of the mixture gas (a mixture of fuel and air at a certain rate) is considerably lower than the maximum pressure at steady state.

On the other hand, when an abnormality occurs in the compression system (cylinder, piston, valve, etc.), the pressure curve is always lowered to some extent than the pressure curve in the normal state as shown by the curve 4 in FIG.

Therefore, the operator can know which system has a problem and engine failure by one inspection.

Of course, multi-cylinder (for engines with multiple cylinders), that is, in the case of automobile engines are generally four or six cylinders, such a pressure measurement test can be performed repeatedly for each cylinder. At this time, if all of the above steps are performed while the pressure of the other cylinder is released to measure the explosion pressure in the specific cylinder, the explosion pressure in the specific cylinder can be measured without interfering with the stroke of the other cylinder.

In addition, it is also preferable to measure the explosion pressure in the cylinder while increasing or decreasing the rotation speed of the engine in order to output more diverse and accurate data.

Of course, the voltages of the high voltage terminal and the low voltage terminal of the adapter may be input by the power of the vehicle itself being maintained, but may also be an external normal power source (specifically specified power supply provided for other normal vehicles or maintenance).

When the external normal power is input by the above test, if the abnormality of the pressure waveform does not occur in all cylinders, it is possible to immediately determine that the ignition system is abnormal.

In addition, it is possible to easily determine the cylinder to be assisted by comparing the explosion pressure of each cylinder.

Control of the engine in the car is done in the ECU. Various information is inputted and analyzed, and the ignition fuel injection valve opening and closing in each cylinder is controlled. In this case, as shown in FIG. 5, an input side 700 for inputting information from various sensors, etc. based on the ECU 600, and an output side including an ignition system fuel system compression system, etc. according to an output of a command analyzed based on the information. 800). The output side has an ignition plug (example of ignition system) injector (example of fuel system) valve (example of compression system) and the like for each cylinder. If the pressure waveforms show the same and similar abnormal curves every time, it means that the input side is faulty. If the pressure waveform in any particular cylinder shows an abnormal curve, it can be seen that there is a failure on the output side. In this case, the ignition system fuel system compression system is abnormal by the analysis as described above with reference to FIGS. 4A to 4C. You can judge.

In the above description, the ignition inductors 30a and 30b explode the mixed gas in the actual cylinder and measure the resulting explosion pressure. However, in some cases, it is necessary to measure only the compression pressure in the cylinder irrelevant to the explosion. There will be. In this case, only the compression pressure in the cylinder may be measured without connecting the high voltage terminal to the high pressure side of the power supply. Therefore, the present invention may be implemented for the same purposes as the prior art.

As described above, although the detailed description of the present invention has been made with reference to the accompanying drawings, FIGS. 1 to 5, the above-described embodiments have been described by way of example only. It should not be understood to be limited only to the examples. Therefore, in addition to the above description, a person having ordinary knowledge in the technical field to which the present invention pertains may easily implement the present invention in another form within the same scope as the above embodiments, or by simply describing the embodiments of the present invention. It will be possible to practice the invention in the same and equal area.

As described in detail above, the present invention has the following effects.

First, since the inspection can be directly tracked by performing inspection while operating the actual engine, the sophistication of engine maintenance is improved.

Secondly, the maintenance workability is greatly improved due to the simple inspection of the engine.

Third, it is possible to reduce the maintenance time and the maintenance cost by the simplicity and simplicity of maintenance.

Fourth, since there is no need to purchase existing expensive equipment (tuning equipment, etc.) used for maintenance, the purchase cost of maintenance equipment can be greatly reduced.

Fifth, it is easy to analyze the cause of failure.

Sixth, since the disassembly and assembly of unnecessary parts can be largely prevented (such as wear of parts due to such dismantling and assembly), the life of the device on which the engine is mounted becomes long, and maintenance work becomes simpler and simpler.

Claims (10)

A main body for transmitting the pressure in the cylinder to the pressure sensor side; And An ignition derivative capable of causing ignition by electric discharge in the cylinder; Adapter for engine maintenance comprising a. The method of claim 1, The main body, the engine maintenance adapter, characterized in that it has a pressure passage for transmitting the pressure in the cylinder to the pressure sensor side. The method of claim 2, The main body may include a flow path forming part in which at least one flow path groove or / and flow path forming the pressure flow path is formed, a coupling part for fixing the flow path forming part to the cylinder, and the at least one flow path groove or / and flow path hole. The engine maintenance adapter, characterized in that it comprises a closed casing for blocking the pressure transmitted to the pressure sensor and the outside and moving to the pressure sensor. The method of claim 1, The closed casing is an engine maintenance adapter, characterized in that the non-conductor. The method of claim 1, The ignition conductor may include an ignition unit which induces electric discharge by a voltage difference between the high voltage terminal and the grounded low voltage terminal, causing ignition in the cylinder, a high voltage terminal connected to a high voltage side of a predetermined power source, and the high voltage terminal and the high voltage terminal. Engine maintenance adapter comprising a connecting portion for connecting. The method of claim 5, The ignition unit, the engine maintenance adapter, characterized in that fixed to the body. A pressure sensor for detecting pressure; An adapter for transmitting pressure in the cylinder to the pressure sensor and causing ignition by electric discharge in the cylinder; And An output device that outputs the pressure sensed by the pressure sensor as data; System that can measure the explosion pressure of the engine cylinder, characterized in that it comprises a. Replacing the spark plug coupled to the cylinder of the engine with the adapter of any one of claims 1 to 6; Connecting between the adapter, a power supply, and a pressure sensor, and an output device that outputs the pressure sensed by the pressure sensor and the pressure sensor as data; Starting the engine; Detecting the pressure in the cylinder generated by the operation of the engine by the pressure sensor; And Outputting the sensed pressure as data by the output device; Method for measuring the explosion pressure of the engine cylinder comprising a. The method of claim 8, If the engine is made of a multi-cylinder method for measuring the explosion pressure of the engine cylinder, characterized in that to perform all the above steps in a state in which the pressure of the other cylinder selectively released to measure the pressure in a particular cylinder. The method of claim 8, And measuring the pressure in the cylinder while adjusting the number of revolutions of the engine.