KR100364892B1 - System and method for testing engines of vehicles - Google Patents

Abstract

The present invention relates to an engine test apparatus and a test method for determining the mechanical assembly state of an automobile engine and the normal condition of electrical components necessary for the start-up operation of the engine.

The present invention comprises an engine test apparatus for driving a test engine and outputting a tested result; An engine type recognition unit for providing information on the type of engine; A monitoring computer that controls the engine test apparatus and compares and analyzes the test results of the engine test apparatus with the steady state information; An engine test system including a display unit for displaying the calculation results of the monitoring computer.

The present invention is an engine test apparatus and test method for testing engines having different configurations with one engine test apparatus, and it is possible to accurately grasp each cylinder failure part of the engine. In addition, it has a function to determine whether each sensor and actuator of the engine, and whether the timing belt is properly mounted in real time to display it. In addition, when the engine test is performed by controlling the speed of the engine using an idle speed controller, there is an advantage of a stable automated test through electrical control.

Description

Automotive engine test system and method {SYSTEM AND METHOD FOR TESTING ENGINES OF VEHICLES}

The present invention relates to an engine test apparatus and a test method for determining the mechanical assembly state of an automobile engine and the normal condition of electrical components necessary for the start-up operation of the engine.

An engine for automobiles is a device that generates a driving force by burning gasoline or diesel oil, and is composed of a combination of a cylinder block for guiding a piston and a cylinder head coupled to the cylinder block.

In addition, the cylinder head is provided with a suction and exhaust device for supplying fuel and discharge of combustion gas, and a valve train for controlling the suction and exhaust action, and the engine thus assembled is lubricated for lubrication of each perturbation part. Many additional devices such as a device and a cooling device for cooling combustion heat are installed.

In addition, a plurality of bores are formed in the cylinder block to slide the pistons, respectively, and the pistons generate power while continuously moving the cylinders in order such as 1-3-2-4.

Since the engine is operated by cycles such as the intake, compression, explosion, and exhaust of the piston, the assembly state has a significant influence on the intake efficiency and exhaust efficiency of the combustion chamber and the filling efficiency of the mixer, and ultimately, the output performance of the engine is influenced. do.

Conventionally, a commercial engine ECU (Electronic Control Unit), that is, an actual vehicle ECU, is used to determine whether an assembly state of an assembled engine is abnormal. However, since engines are configured differently for each manufacturer, a commercial ECU for each engine is required to inspect the assembly state of various types of engines. That is, as shown in Figure 1, the engine (1) by connecting the ECU 10, 11, 12, 13, 14, 15, 16 for each engine through the switching relay (3) Switch as soon as possible to check the assembly of each engine. Therefore, the installation is very complicated and the failure rate is also high.

In addition, in the conventional test using the commercial ECU, even if there is an abnormality in the engine, the failure is compensated by the correction logic inside the commercial ECU, so the operator cannot determine whether the engine is abnormal. For example, in a four-cylinder engine that requires an engine speed of 800 RPM, if there is a problem with one cylinder, the ECU's compensation logic causes the engine speed to reach 800 RPM by injecting more fuel into the remaining three cylinders. have. Therefore, it is not possible to accurately check the failure part of the engine.

In addition, in testing engines using conventional commercial ECUs, a real-time measurement is not performed on abnormalities of sensors, actuators, and the like. For example, a method of determining whether an injector is abnormal is used to check whether a disconnection is made or a method of estimating that an injector is abnormal based on an abnormal condition of an engine.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to test the assembly state of the engine having a different configuration using a single engine test device and method To provide.

Another object of the present invention is to provide an engine test system and method that can accurately check a failure site by outputting an abnormality without correcting it when an abnormality occurs in one part of the engine.

Another object of the present invention is to provide an engine test system and method capable of identifying in real time whether an abnormality of a device, such as a sensor or an actuator.

1 is a configuration diagram showing a method for testing several types of conventional engines

2 is an overall configuration diagram of an engine test system according to the present invention;

3 is a block diagram illustrating the configuration of the multi-engine control apparatus of FIG.

4 is an exemplary view of appearance of FIG.

5 is a block diagram illustrating the configuration of the monitoring computer of FIG.

6 is a graph showing the engine test method according to the present invention in relation to time and revolutions per minute;

7A and 7B illustrate test methods and test results of the injector, respectively.

8A and 8B illustrate a test method and a test result of an ignition device, respectively.

9A and 9B illustrate test methods and test results of an idle speed controller, respectively.

<Explanation of symbols for main parts of drawing>

1: test engine 20: monitoring computer

30: multi engine controller 50: engine ID reader

In order to achieve the above object of the present invention, the present invention is connected to a test engine, the engine test apparatus for driving and testing the test engine suitable for the type of the test engine; An engine type recognition unit for providing information on the type of the test engine; The engine test apparatus controls the engine test apparatus according to the type of engine provided by the engine type recognition unit, and has information of each steady state according to the engine type, and compares and analyzes the test result of the engine test apparatus with the information of the steady state. Monitoring computer; It provides an engine test system including a display unit for displaying the operation results of the main control unit.

The test engine is marked with a recognition symbol according to the engine type, and the engine type recognition unit recognizes the recognition symbol of the test engine. A representative example of the recognition symbol is a barcode.

In the engine test apparatus for testing each cylinder operating state of the test engine, preferably, the fuel intake injected into one of the plurality of cylinders of the engine is blocked, and the remaining cylinder is driven so that the fuel intake is blocked. It is characterized by detecting the revolutions per minute (hereinafter referred to as RPM) only for the remaining cylinders with the reduced revolutions per minute.

The present invention also provides a method for adjusting the rpm of a test engine including a plurality of cylinders, a throttle valve connected to each cylinder to supply air, and an idle speed controller installed in a passage for bypassing the throttle valve. Driving each cylinder of the test engine; Fixing an opening amount of the throttle valve; It provides a method for adjusting the rpm of the test engine comprising the step of adjusting the air flow to the cylinder by operating the idle speed controller.

A plurality of cylinders, an injector for injecting fuel into each of the cylinders, an ignition device for adjusting the ignition timing for each of the cylinders, a throttle valve provided in a passage for supplying air to the cylinder, and a passage provided with the throttle valve. A cooling device having an idle speed controller installed in the bypass passage, a throttle position sensor (hereinafter referred to as a TPS) for sensing the opening degree of the throttle valve, and a cooling water for cooling the cylinder, and the cooling device As a method of testing a test engine having a coolant temperature sensor for detecting the temperature of the coolant, and a manifold, which is a collection of tubes for supplying intake air to the cylinder,

Igniting each cylinder; Detecting at least one voltage of the idle speed controller, the throttle position sensor (TPS), the coolant temperature sensor, and the ignition device in the ignition state; An engine test method comprising comparing the detected voltage with a normal voltage.

The engine test method preferably further comprises the step of displaying a result compared with the normal value.

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

2 is a view showing an engine test apparatus system according to a preferred embodiment of the present invention. As shown, the engine test apparatus system according to a preferred embodiment of the present invention includes a display unit 21 and a main control unit 23. To connect the excitation monitoring computer 20, the multi-engine control unit (M-ECU) 30, which is an engine test apparatus for testing the test engine 1, and the multi-engine control unit 30 and the test engine 1; A test wiring harness 55 and an engine ID reader 50 which is an engine type recognition unit for grasping the engine type of the test engine 1.

It also has a processing line control system (PLC) 53, which is a sequence control device that connects various devices required for testing to a test engine.

The multi-engine control device 30 is a device that is connected to the test engine 1 and the wiring harness 55 to perform an actual test. As shown in FIG. 3, various signals of the test engine are received. An input unit 33, a serial interface unit 37 for communicating with the monitoring computer 20, and a storage unit for storing a program for performing a test according to the type of the test engine and a specific test mode for a specific engine (39) and a suitable program stored in the storage unit (39) according to the control signal of the monitoring computer (20) coming in through the serial interface unit (37) and the test engine signal entering through the input unit (33). For example, the control unit 31 generates a control signal for performing a test suitable for the test engine, and receives a control signal from the control unit 31 and, as a timer with the test engine 1. A is provided with an input and output timer input-output unit 41 for, and the output unit 45 to the transfer to the test engine, the control signal of the controller 31, a display 43 for displaying the result calculated by the controller.

The input unit 33 is divided into a digital input unit 61 and an analog input unit 63, and an on / off signal of an oil switch 71 and an alternator 73 is input to the digital input unit, and the analog Signals from various sensors are input to the input unit 63. The various sensors are, for example, a thrust position sensor (TPS) 75 for detecting an opening amount of a throttle valve and a coolant temperature sensor for detecting a state of a coolant temperature. (Water Temperature Sensor) 77, Battery Voltage Detector 79 for detecting the voltage of the battery, Air Temperature Sensor 81 for detecting the state of the intake air temperature, and absolute manifold Manifold Absolute Pressure Sensor 83 which detects a pressure, etc. are mentioned. The analog signal is input to the controller 31 through an A / D converter (ADC) 65.

Meanwhile, the output unit 45 is also divided into an analog output unit 64 and a digital output unit 62, and the digital output unit 62 includes various relays necessary for driving suitable for engine testing according to the control signal of the control unit 31. The relay operation signal for the operation of 87 is output to the test engine, and the sensor test signal 89 necessary for obtaining the information of the various sensors is output to the analog output unit 64. The signal from the control unit 61 to the analog output unit 64 is transmitted through a D / A converter (DAC) 66.

The timer input / output unit 41 is for inputting time information of the injector 91, the ignition device 93, and the idle speed controller 95 to the controller 31, and outputs the time information from the controller. Crankshaft position information and camshaft angle information 85 are added as needed.

Meanwhile, the serial interface unit 37 receives information on the type of the test engine and a control signal about the test mode from the monitoring computer 20, and various results of the test performed by the multi-engine test apparatus 30, for example, It is an interface for transmitting information on whether the various sensors are normal and the engine revolutions per minute to the monitoring computer 20.

In addition, the multi-engine control apparatus 30 according to the present embodiment, as can be seen through the appearance of Figure 4, preferably comprises an operation switch 35 for the operator to artificially operate, the operation switch ( 35 includes a selector button switch 101, a power switch 103, an ignition controller 105, and an injector controller 107, so that the operation switch can also select a test mode and an engine type. Doing. In addition, there is a display unit 43 for displaying the necessary contents to the outside so that the operation of the operation switch and the control state of the control unit can be easily known, and this display unit may be an LCD or an LED, for example, an operation state display unit ( 109, an engine speed display 111, and an intake air pressure display 113.

On the other hand, the engine ID reader 50 is, for example, a kind of scanner that can read a recognition code such as a bar code, which is information on the type of engine displayed on the test engine. Sending to the computer 20, the monitoring computer determines the engine type based on this information and drives the multi-engine test apparatus 30 according to this information.

Meanwhile, as shown in FIG. 5, the monitoring computer 20 controls the input unit 25, the control unit (hereinafter referred to as the main control unit) 23, the storage unit 29, and the main control unit 23. And an output unit 27 connected to a serial interface 37 for outputting a signal to the multi-engine test apparatus, and a display unit 21 for displaying the calculation result of the main control unit.

The input unit 25 controls information through an input device 57 through which an operator determines a test mode for testing a test engine, such as a keyboard and a mouse, and inputs it to a computer, and the multi-engine through the serial interface 37. The controller initial information such as the engine test result information sent from the test apparatus 30 and the engine type read from the engine ID reader 50 is received.

The storage unit 29 may analyze information on an engine type associated with scan information of the engine ID reader 50, information on a test mode according to the type of engine, and a result according to each test mode of various engines. I have a lot of data.

The main controller 23 calculates an input signal from the input unit 25, issues a control command to the multi-engine test apparatus 30 through the serial interface 37, and inputs the engine through the serial interface. The test result is compared with the various data stored in the storage unit 29 and the result is sent to the monitor of the display unit 21.

The monitor of the display unit 21 displays the type of engine identified from the information from the engine ID reader 50, a test result of the multi-engine test apparatus 30, a test mode, a test state, and the like.

Referring to the operation relationship of the present invention having the above-described configuration, first, the engine control unit 23 in the main control unit 23 of the monitoring computer 20 in accordance with the scan information of the engine ID reader 50, the monitoring computer 20 The control signal is sent to the multi-engine test apparatus 30 based on the test mode selected from the input device 57 of the input unit 25 of the input unit 25, and the multi-engine test apparatus 30 includes the type of engine included in the control signal. And calling the test program according to the test mode from the storage unit 39 to perform the necessary tests, and sending the result values to the monitoring computer 20 to compare the previously stored experimental values and the like, and display them on the monitor 21 of the monitoring computer. To be.

On the other hand, as another method, it is possible to send a control signal to the control unit 31 of the multi-engine test apparatus through the operation unit 35, which is attached to the multi-engine test apparatus 30 as described above.

Hereinafter, a method for testing a test engine with the engine test system according to the present invention having the configuration as described above will be described in detail.

First, a method of testing an engine for RPMs, that is, RPMs, of an engine will be described with reference to the graph of FIG. 6, and a leak (leakage) and oil warning are checked at a low RPM.

In the liquidity test, the engine is driven by the motor only with both the intake manifold and throttle valve closed, and the pressure of the intake manifold, ie, MAP (Manifold Absolute Pressure), is checked and the absolute pressure drops. It is determined that the above-mentioned air flows due to abnormality.

The oil warning lamp test is also driven by a motor and checked. If the oil warning lamp is not released even though the motor reaches a certain RPM, it is determined that there is an error.

After the engine is ignited and warmed up for a certain period of time, the cruise speed is tested using an idle speed actuator. At this time, the present embodiment is characterized in that the idle speed controller installed in the passage bypassing the passage in which the throttle valve is installed, without operating the throttle valve during acceleration. Conventionally, the throttle valve is operated and tested. In order to apply this method, the operator wound the throttle valve by hand, and operated the throttle valve by hand. However, since the idle speed controller is a motor type, such as a step motor, it is possible to control the acceleration by only an electrical operation, so the acceleration performance test is more simple.

Next, the power balance test tests the state of each cylinder of the engine.In this test, the normal RPM is first determined through the normal fuel injection to each cylinder applied to the four or six cylinders. The injection nozzle, that is, the injector is blocked to detect the RPM output to the remaining cylinders only. At this time, as an example of the manual operation, as can be seen from the appearance of the multi-engine test apparatus shown in FIG. 4, it is possible to turn on / off each injector. As a way of checking the result of the test, it is normal that the output of only one cylinder should be lower than the normal RPM at which all cylinders operate while the fuel injection of one cylinder is turned off. If similar, the blocked cylinder may be determined to have an abnormality.

Compared to the method of testing the engine using a conventional commercial ECU in this test, the conventional commercial ECU test performs a correction to compensate the output of the cylinder as described above. Although it is difficult to determine whether the test method of the present embodiment, there is a difference in that the output is not compensated for, due to this difference can be specifically identified a cylinder with an error in the test engine.

Next, the rapid acceleration and deceleration tests are performed. In this case, a test for directly operating the throttle valve is performed to determine whether there is an abnormality according to the increase or decrease of RPM.

Hereinafter, a method of checking various sensors and actuators and a method of checking whether the timing belt is properly mounted in the present embodiment will be described in detail.

The test of the injector's status is performed by checking the voltage value applied to the point “A” between the grounded transistor and the injector 91 as shown in FIG. 7A while the engine is ignited, as shown in FIG. 7B. If the voltage at the point “A” is detected when the injector is driven, 0 to 1 V is detected, and when about 12 V is detected when the injector is stopped, it may be determined that the injector operates normally.

Then, the ignition status test is performed in the ignited state, as shown in FIG. 8A, by checking the voltage variation applied to the "B" point between the grounded transistor and the ignition apparatus 93, and as shown in FIG. 8B. As described above, when the voltage value at the point “B” is detected about 0 to 1 V when the ignition coil in the ignition device 93 is discharged and about 12 V is detected when the ignition coil is discharged, it can be determined that the ignition device operates normally. .

Next, when testing whether the idle speed controller is normal, in the ignited state, as shown in FIG. 9A, the voltage variation at the "C" and "D" points of the idle speed controller 95 is checked. As shown in FIG. 9B, if there is no place where both places are 0V at the same time, it can be determined that the device operates normally.

Other tests such as the MadFold Absolute Pressure Sensor, Coolant Temperature Sensor, TPS, etc. are also possible by checking the voltage output while ignited. For example, it can be seen that the mad fold absolute pressure sensor operates normally when the voltage output value is 0.8-4V, the coolant temperature sensor has the voltage output value 2-3V, and the TPS operates normally when the voltage output value is 0.5-3V. .

Further, whether the timing belt is properly mounted can be detected by detecting the phase difference between the cam axis angle signal and the crankshaft position signal. For example, if there is a reference value that is normal when the phase difference between the camshaft angle signal and the crankshaft position signal is 10 °, if the phase difference of the singular point is detected as 48 °, it is possible to determine that the timing belt is abnormal. Can be.

It is natural that other exhaust gas analysis tests, spark plug gap tests and the like can be performed.

While some embodiments of the present invention have been described above, these are merely examples, and various changes and modifications may be made without departing from the spirit of the present invention. However, it will be apparent from the appended claims that such changes and modifications fall within the scope of the present invention.

As described above, in the present invention, by using a multi-engine test apparatus suitable for testing engines having different configurations, the equipment is simplified and equipped as compared to the conventional test method, which requires a separate commercial ECU for each engine. The effect is a marked drop in failure rate.

In addition, in the present invention, when testing whether each cylinder of the engine is abnormal, when an abnormality occurs in each cylinder of the engine, by outputting the presence or absence of the abnormality without correcting it, it is possible to accurately check the failure site.

In addition, the present invention can determine in real time the abnormality of the device, such as sensors, actuators, it can be known through a display such as a monitor.

In addition, the present invention has the effect of performing an automated test through electrical control by controlling the speed of the engine using an idle speed controller rather than the conventional throttle valve operation method that relies on manual operation when performing the engine test, operator malfunction It makes more stable test by compensating for error caused by error or test delay time due to manual operation.

The present invention also has the advantage of providing a more accurate information on whether the timing belt is properly mounted in a manner of detecting the phase difference between the camshaft signal and the crankshaft signal.

Claims (6)

As a test system for testing a test engine with an identification symbol according to the engine type, A multi-engine control device connected to the test engine, for driving the test engine according to the type of the test engine, testing the test engine, and outputting the tested result; An engine type recognition unit recognizing the identification number of the test engine and providing information on an engine type; The multi-engine control device is controlled according to the type of engine provided by the engine type recognition unit, and has information of each steady state according to the engine type, and the test result of the multi-engine control device is compared with the information of the steady state. A monitoring computer for analyzing; A PLC, which is connected to the monitoring computer and is a sequence control device for connecting devices necessary for the test of the test engine; A serial interface which is a communication path between the monitoring computer and the multi-engine control device; A display unit for displaying the calculation result of the monitoring computer Automotive engine test system comprising a. The method according to claim 1, The multi-engine control device An input unit for receiving various signals of the test engine; A serial interface unit for communicating with the monitoring computer, a storage unit for storing a program for performing a test according to the type of the test engine and a specific test mode for a specific engine; A controller for calling a suitable program stored in the storage unit according to a control signal of a monitoring computer coming through the serial interface unit and a signal of a test engine coming through the input unit to generate a control signal for performing a test suitable for the test engine; A timer input / output unit configured to receive a control signal from the controller and to input and output timer logic with the test engine; An output unit which receives the control signal of the controller and transmits it to the test engine, and a display unit which displays the calculation result of the controller Automotive engine test system equipped with a. The method according to claim 1, The monitoring computer The operator receives the control information through an input device for determining a test mode to test a test engine and inputting it to a computer, the engine test result sent from the multi-engine control device through the serial interface, and the engine type recognition unit. An input unit for receiving controller initial information including information on the type of engine entered; A storage unit having information for knowing the engine type through the information of the engine type recognition unit, information about a test mode according to the type of engine, and various data for analyzing the results according to each test mode of various engines; It calculates according to the input signal of the input unit and issues a control command to the multi-engine controller through the serial interface, and compares and analyzes the test results of the engine input through the serial interface with various data stored in the storage unit. And main control unit for sending to the display unit, Output unit connected to the serial interface for outputting the control signal of the main control unit to the multi-engine control unit Automotive engine test system equipped with a. As a method of testing a variety of automobile engines having a plurality of cylinders, Providing a multi-engine control apparatus programmed with a plurality of test methods according to the type of vehicle engine; Identifying a type of the test vehicle engine; Testing an engine with the multi-engine control device according to the identified type of vehicle engine Automotive engine test method comprising a. The method according to claim 4, Automotive engine test method for determining the abnormality of the cylinder of the engine by grasping the revolutions per minute with only the remaining cylinders while sequentially stopping the fuel supply to one of the plurality of cylinders of the engine in the testing of the engine The method according to claim 4, The test engine includes a throttle valve for supplying air to the plurality of cylinders and an idle speed controller for bypassing the throttle valve, An automobile engine test method of operating the idle speed controller when raising the engine revolutions per minute in the testing of the test engine.