KR20060135283A - Injector testing device and method - Google Patents

Abstract

An injector testing device and an injector testing method are provided to objectively check abnormality and performance of an injector by connecting a signal generator including a micro processor to the injector and measuring the amount of fuel discharged to the injector by operating the signal generator. An injector testing device comprises a fuel delivery unit(200), a common rail(300), an injector(100), a signal generator(400), and a metering unit(500). The fuel delivery unit is arranged to high-pressure pump fuel. The common rail is connected to the fuel delivery unit, and supplies fuel to the injector. The injector is equipped with a solenoid valve, and connected to the common rail so that the injector discharges fuel by operating the solenoid valve when a predetermined electrical signal is received. The signal generator is connected to the injector, and generates the electrical signal to the solenoid valve. The metering unit receives fuel discharged from the injector.

Description

Injector testing device and method

1 is an overall perspective view according to the present invention.

Figure 2 is a perspective view of each device connected to the injector.

3 is a front view of the electric signal generator of the present invention.

4 is a device block diagram of a signal generator according to the present invention.

5 is a flow chart in accordance with the present invention.

6 is an operational flowchart of an electric signal generator.

      << Explanation of code | symbol about main part of drawing >>

100.Injector 110 ... Fuel input

120 Fuel outlet 130 Electrical signal input

140 Backflow outlet 200 Fuel feed means

300 ... common rail 310 ... pressure control lever

400 ... Signal Generator 401 ... Electrical Signal Input Terminal

410, 411, 412, 413, 414, 415 ... indication LED

420, 421 ... Selection button 422 ... Test confirmation button

423 Start button 424 Stop button

500 ... Measurement part 510 ... Exhaust hose

501, 502, 503, 504 ... measuring cylinder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing an injector that is a component of a common rail direct injection engine, which is a type of an automobile internal combustion engine, and particularly, comprising: a fuel pump means for pumping fuel at a high pressure; A common rail for supplying the fuel pumped therefrom to the injector, an injector coupled to the common rail to open and close the discharged fuel, and an electrical signal coupled to the injector to control the valve The present invention relates to an injector test apparatus and a method including a signal generator and a measuring unit for storing fuel discharged from the injector.

In particular, the present invention is a signal generator comprising a microprocessor therein to apply the electrical signal to the injector to perform the same function as the ECU (Electronic Control Unit) of the vehicle that controls the injection amount and injection timing of the fuel injector And measuring the amount of fuel discharged to the injector by driving the signal generator to check whether there is an abnormality and performance of the injector.

Unlike conventional engines that supply fuel and air to the combustion chamber through the mixer, the common rail engine injects high-pressure fuel directly into the combustion chamber to make the engine and fuel injection independent so that the design is easy and the number of parts is reduced. In addition, since the pressure of the fuel is directly injected to control the pressure, the high pressure can be maintained and the combustion efficiency can be increased.

The common rail engine as described above has a high-pressure accumulator capable of maintaining high pressure to separate pressure generation and injection, and a common rail for distributing high-pressure fuel to a plurality of injectors. It consists of a plurality of injectors for injecting fuel supplied from the common rail through a nozzle installed therein in accordance with a signal sent from the ECU.

The high-pressure accumulator and the common rail which perform static operation among the components of the common rail engine have a low frequency of failure due to the compactness and characteristics of the components, and easily determine whether the failure occurs. Injectors that are made and perform dynamic operations frequently have a high number of failures or malfunctions due to the characteristics of the operation.

In order to test the abnormality of the conventional injector, remove the injectors mounted on the engine of the car, change the positions of each other, install them again in the engine of the car, and operate the injector to determine the abnormality of the injector, or After applying the voltage to the instantaneous analysis, it was confirmed whether the injector was abnormal.

Therefore, the conventional injector test method was unable to objectively check the function check of the injector, and the number of injectors installed in the common rail engine also had a large number, which caused a problem in that it was not possible to easily identify a malfunctioning or malfunctioning injector.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, the microprocessor therein to perform the same function as the ECU (Electronic Control Unit) of the vehicle that controls the injection amount and timing of injection by applying an electrical signal to the injector The function of the injector is determined by fastening a signal generator including the injector to the injector, and driving the signal generator to measure the amount of fuel discharged to the injector so as to objectively check whether there is an abnormality and performance of the injector. It is to provide an injector test apparatus and method with increased convenience.

This object can be achieved by the present invention comprising a fuel pressure means and a signal generator for transmitting an electrical signal to the injector and the fuel discharged from the injector, the common rail is installed, the following drawings, the accompanying drawings It demonstrates in detail with reference.

The present invention relates to an apparatus for testing an injector which is a component of a common rail direct injection engine, which is a kind of an internal combustion engine of an automobile, comprising: a fuel pump means for pumping fuel at a high pressure; A common rail for supplying the fuel supplied to the injector is provided, and a solenoid valve is provided inside the injector, and the injector is engaged with the common rail to operate the solenoid valve to discharge the fuel when a predetermined electric signal is received. It consists of an injector, a signal generator coupled to the injector for transmitting the electrical signal to the solenoid valve and a measuring unit for storing the fuel discharged from the injector.

Hereinafter will be described in detail with reference to the accompanying drawings.

Figure 1 shows a perspective view of the overall device of the invention and Figure 2 shows a perspective view of each device connection to the injector.

The present invention is coupled to the fuel pumping means 200 to the fuel pumping means 200 for pumping the fuel at high pressure connected to the fuel provided by the common rail 300 and the common rail 300 in the engine of the vehicle Disconnect from and connect the injector 100 to be tested.

The common rail 300 is provided with a pressure control lever 310 for adjusting the pressure.

The injector 100 is connected to the common rail outlet 100 and the input port 110 through which fuel is introduced, the outlet 120 through which the fuel is discharged, and the electrical signal generated by the signal generator 400 is an electrical signal input terminal ( There is an electric input unit 130 input through the 401, a reverse flow discharge outlet 140 through which the reflux fuel is discharged, and a reverse flow discharge collection hose 520 collecting the fuel discharged from the reverse flow discharge outlet 140.

In particular, a solenoid valve is provided inside the injector, and when the predetermined electric signal is received, the fuel is discharged by operating the solenoid valve.

The electrical input of the injector receives a predetermined electrical signal generated by the signal generator 400.

It is composed of a measuring unit 400 for receiving the fuel discharged from the fuel discharge port and the backflow discharge port of the injector.

The injector test apparatus connected as described above first pumps fuel from the fuel pump means 200 and transmits the fuel to the common rail 300. The fuel delivered to the common rail 300 is input to the fuel input unit of the injector 100. In addition, the signal generator 400 sends an electric signal to the injector, and the injector opens and closes the valve at regular intervals by operating a solenoid valve in accordance with the electric signal therein. Fuel discharged from each injector according to the opening and closing is introduced into the measurement cylinders 501, 502, 503, and 504 of the measurement unit 500 along the discharge hoses 510. In addition, the fuel flowed back from each injector flows into the counter flow cylinder 505 of the measurement unit 500. The refluxing fuel is not a measurement object for determining whether there is an abnormality of the injector, so it may be introduced into the backflow cylinder 505 by integrating the backflow discharge collection hose 520.

Each device may be operated for a predetermined time to search for an amount of fuel introduced into the measurement cylinders 501, 502, 503, and 504 to select an abnormal injector. That is, if a large amount of fuel is ejected or a small amount of fuel is ejected than other injectors, it may be identified as a defective injector.

The amount of fuel discharged from the injector may vary slightly depending on the time of operation and the size of the measuring cylinder. However, if the fuel volume is within an error range of ± 8% of fuel volume according to the operation for about 10 minutes, it may be determined as a normal injector. .

Figure 3 shows a front view of the signal generator of the present invention.

The signal generator includes a power switch 430 for applying power to the signal generator; Selection buttons 420 and 421 for selecting the number of injectors to be output, and selection buttons LEDs 410 and 411 displayed by the respective selection buttons 420 and 421, respectively, for a predetermined time to check whether the injector is connected or not. A test check button 422 to operate only and an LED 412 indicating a normal connection displayed by the test check button 422, and an LED 413 requesting connection check; An LED 414 for displaying a start button 423 for transmitting an electric signal to an injector and the start button 423; A stop button 424 for stopping the signal generator and an LED 415 for displaying the stop button; RPM control switch 431 for controlling the electrical signal for controlling the injection amount and the injection timing of the fuel and the delivery terminal 432 for transmitting the electrical signal.

Figure 4 shows a device block diagram of the signal generator of the present invention.

The signal generator includes a power supply unit 40 for receiving power; A switch unit (41) for receiving a selection condition of an operation and an input unit (42) for transmitting a command according to a condition selected by the switch unit; A main unit 43 for converting and controlling a command received from the input unit into a predetermined signal by a program by a microprocessor installed therein; An output / receiver 44 which receives the signal generated by the main unit, outputs an electrical signal to an output terminal, and receives an operating state; And a display section 45 for displaying the signal received at the output / receiving section.

5 shows a flowchart of the operation according to the invention.

The fuel is pumped at high pressure to supply fuel to the injector (S_1). By operating a signal generator to generate an electrical signal (S_2) and the electrical signal is transmitted to the injector, the solenoid valve formed inside the injector is opened and closed, the fuel is discharged from the injector (S_3) and receives the fuel discharged from the injector and Test the injector by measuring (S_4).

FIG. 6 is a flowchart illustrating the steps of generating an electrical signal by operating the signal generator of FIG. 5.

The input unit 42 of the signal generator searches whether the test check button is pressed or the start button is pressed (S_11). If the test check button is pressed, the electric signal is sent to the injector during the test time (S_12) and the test time is finished. When the test time is over (S_13), the connection with the injector is checked (S_14) and the result is displayed (S_15).

When the start button is pressed in the input unit 42 of the signal generator, an electric signal is generated during the set sending time (S_21), and it is checked whether the sending time is finished (S_22). If the sending time is finished, the result is displayed (S_23). .

In the above, it is preferable to check the presence or absence of the input signal of the stop button 424 at each step. That is, it is preferable to stop the operation of the signal generator by the operation of the button when an emergency situation occurs by checking the input signal of the stop button at each step.

The present invention can objectively check the abnormality and performance of the injector by fastening a signal generator comprising a microprocessor therein with the injector and measuring the amount of fuel discharged to the injector by driving the signal generator. In addition to providing objective belief in the function check of the injector, the simple and compact configuration of the injector provides a great effect such as the convenience of maintenance.

Claims (6)

Fuel feeding means for pumping fuel at high pressure; A common rail which is fastened to the fuel feeding means and supplies fuel supplied to the injector; An injector having a solenoid valve inside the injector, wherein the injector is engaged with the common rail to operate the solenoid valve to discharge the fuel when a predetermined electric signal is received; A signal generator coupled to the injector to generate the electrical signal to the solenoid valve; A measuring unit accommodating fuel discharged from the injector; Injector test apparatus, characterized in that consisting of. The method of claim 1, wherein the signal generator, A power supply unit receiving power; A switch unit receiving a selection condition of an operation and an input unit transferring a command according to a condition selected by the switch unit; A main unit converting and controlling a command received from the input unit into a predetermined signal by a program by a microprocessor installed therein; An output / receiver which receives the signal generated by the main unit, outputs an electrical signal to an output terminal, and receives an operating state; A display unit which displays a signal received at the output / receiver; Injector test apparatus, characterized in that consisting of. The method of claim 2, wherein the switch unit, A start button for transmitting an electrical signal to the injector; A test check button that operates only for a predetermined time to check whether the injector is connected; A selection button for selecting the number of injectors; A stop button for stopping the signal generator; RPM control switch for controlling the electrical signal for controlling the injection amount and the injection timing of the fuel; Injector test apparatus, characterized in that consisting of. Apparatus according to any one of claims 1 to 3, Pumping the fuel at high pressure to supply fuel to the injector; Operating the signal generator to generate an electrical signal; Receiving the electric signal to open and close a solenoid valve formed therein to discharge fuel from an injector; Receiving and measuring fuel discharged from the injector; Injector test method comprising a. The method of claim 4, wherein the step of generating the electrical signal by operating the signal generator, Searching whether the test check button is pressed or the start button is pressed; Transmitting an electrical signal to the injector for a test time when the test confirmation button is pressed; Checking whether the test time has ended; Checking whether the injector is connected when the test time is over; Checking whether the connection is present and displaying a result; Injector test method, characterized in that further comprises. The method of claim 4, wherein if the start button is pressed, Generating an electrical signal for a set dispensing time; Confirming whether the sending time has ended; Displaying a result if the delivery time is over; Injector test method, characterized in that further comprises.

Images