JP2000035379A - Internal combustion engine tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine tester for easily learning a mechanism and a principle of an internal combustion engine in a short time even for a student. SOLUTION: The internal combustion engine tester 1 is provided with sensors 20, 21 for obtaining data necessary for performance test of an engine 3, an indicator for displaying measured data of the respective sensors, a personal computer 70 for inputting the respective data, and an internal combustion engine control means for controlling driving of the engine 3. The computer 1O has an automatic measuring means 103 for automatically reading and processing the data from the sensors, a manual measuring means 104 for processing the data displayed on the indicator and manually input, and a performance analyzing means 105 for analyzing performance of the engine 3 based on the data input by the respective measuring means. Since the means 104 is provided, a testing operation can be actively conducted by a student or the like, thereby enhancing an educational effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine test apparatus for testing the performance of an internal combustion engine, and more particularly to an internal combustion engine test apparatus suitable for educational purposes.

[0002]

2. Description of the Related Art Conventionally, an internal combustion engine such as a gasoline engine of an automobile has been an important power source, and it is important to grasp its operating state and performance as part of heat engine education.

[0003]

However, as such a test apparatus for an internal combustion engine, there is only an apparatus used for an operation test when an automobile manufacturer or the like manufactures an engine. The device is automated to reduce the test work, and has a problem that it is not suitable as a test device for education for students such as high school students and university students.

[0004] It is an object of the present invention to provide an internal combustion engine test apparatus that allows a student to easily and quickly learn the mechanism and operating principle of an internal combustion engine.

[0005]

SUMMARY OF THE INVENTION An internal combustion engine test apparatus according to the present invention comprises a sensor for acquiring data required for a performance test of an internal combustion engine, an indicator for displaying data measured by each sensor, A computer capable of inputting data from the sensor and an internal combustion engine control means for controlling the driving of the internal combustion engine, and the computer automatically reads and processes the data from the sensor, It is characterized by comprising: manual measurement means for processing data that is displayed and manually input on the indicator; and performance analysis means for analyzing the performance of the internal combustion engine based on the data input by each measurement means. is there.

According to the present invention, in addition to the automatic measuring means for automatically reading and processing data from the sensor,
Since an indicator for displaying data measured by each sensor and a tester such as a student reading data displayed on the indicator and a manual measuring means for processing data manually input using a keyboard or the like are provided, The student can be actively engaged in the examination work, and the educational effect can be enhanced. Furthermore, since the data input by the automatic measuring means and manual measuring means are both analyzed by the performance analyzing means, the performance analyzing means can be shared by the measuring means, thereby reducing costs. can do.

It is preferable that the computer includes automatic driving means for automatically controlling the internal combustion engine control means in accordance with a preset operation program. If such automatic driving means is provided, students can concentrate on data collection and analysis during the test work, and an appropriate educational effect can be obtained. If the test program can be changed and created by the tester, performance tests can be performed under various operating conditions.

Further, it is preferable that the computer includes a manual operation means for controlling the internal combustion engine control means in accordance with a setting operation by a tester. If such a manual driving means is provided, the test can be performed by allowing the tester to manually control the engine, and the educational effect can be further improved.

The internal combustion engine control means preferably includes a throttle valve opening control device for controlling a throttle valve opening of the internal combustion engine, and a dynamometer control device for controlling a dynamometer connected to the internal combustion engine. With such a configuration, by controlling the dynamometer that measures the torque by absorbing the power and operating at a constant rotation, the load on the internal combustion engine, for example, a certain inclination angle (uphill or A load corresponding to traveling at a certain speed on a downhill road can be applied. Therefore, by controlling the throttle valve opening corresponding to the throttle (accelerator) opening and the load of the dynamometer and controlling the rotation speed, it is possible to perform operation control under various conditions.

[0010] Further, the sensor may be prepared as appropriate depending on the type of data to be acquired. At least a rotational speed measuring sensor for measuring the rotational speed of the output shaft of the internal combustion engine, and a sensor connected to the internal combustion engine. It is preferable to include a load measuring sensor for measuring the load of the dynamometer and a pressure gauge for measuring the pressure in the combustion chamber of the internal combustion engine.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the internal combustion engine test apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an internal combustion engine test apparatus 1 according to the present embodiment, and FIGS. 2 and 3 are a front view and a side view of the internal combustion engine test apparatus 1.

The internal combustion engine test apparatus 1 includes a gantry 2 on which various devices required for an experiment are mounted. An engine 3 (for example, a water-cooled 4-cycle overhead valve gasoline engine) to be tested is installed on the gantry 2. Further, the gantry 2 has a fuel tank 4 with a level gauge, a head tank 5 for storing cooling water, and a dynamometer (water-cooled eddy current braking type dynamometer) 7 connected to the engine 3 via an eccentricity compensation double universal 6. A circulating pump 8 for supplying water to the engine, a circulating pump 9 for supplying water to the dynamometer, an intake duct 10, a stainless flexible exhaust pipe 11 incorporating exhaust pressure and exhaust gas detection holes, and the like are provided.

Further, various sensors (measuring devices) are attached to the engine 3 and the dynamometer 7. For example, as shown in FIG. 4, the engine 3 measures the rotation angle of its output shaft, that is, the rotary encoder 20 which is a rotation speed measuring sensor for detecting the crank angle and the rotation speed, and measures the combustion chamber pressure of the engine 3. A tonometer 80 is attached. The dynamometer 7 is provided with a dynamometer load detector 21 which is a load measuring sensor for measuring the load of the dynamometer 7.

Further, the gantry 2 has an intake air amount / intake pressure measuring device (a round precision nozzle, a pulsation absorbing film, a variable tension built-in surge tank) 22, a fuel flow detector 23, and a cooling water flow meter (area flow rate). 24) are also provided.

An indicator for displaying data measured by various sensors is arranged on the measurement panel 30 above the gantry 2. Specifically, the cooling water inlet temperature indicator 3
1. Cooling water outlet temperature indicator 32, exhaust gas temperature indicator 3
3, lubricating oil temperature indicator 34, plug seat temperature indicator 35,
Intake air temperature indicator 36, fuel consumption indicator 37, exhaust gas pressure gauge 38, lubricating oil pressure gauge 39, cooling water temperature alarm setter 40, digital throttle valve opening indicator (throttle valve opening controller) 41 , A digital manometer 42, a fuel consumption indicator (burette triplet) 43, and the like. Accordingly, although not shown, sensors such as various thermometers and pressure gauges for the various indicators are also installed at appropriate places.

The measuring panel 30 further includes a power switch 51, a circulating pump switch 52, a measuring instrument power outlet 53, an intake air amount / intake pressure switch 54, an analog output connector 55, and a dynamometer control device (constant rotation). Control, boost control, rotation speed display, torque display, alarm) 56, choke valve 57, water supply switch 58, start switch 59, and the like.

Each of these devices is connected to a personal computer (personal computer) 70 as a control device via an interface board (A / D, D / A conversion board) 60. That is, as shown in FIG.
The automatic driving software 71 is installed in the personal computer 70 by using the automatic driving software 71.

Data analysis software 74 is installed in the personal computer 70. The data analysis software 74 and the like provide an automatic measuring means 103, a manual measuring means 104, and a performance analyzing means 105 in the personal computer 70. The automatic operation means 101 and the manual operation means 102 are configured to be able to control the throttle valve opening control device 41 and the dynamometer control device 56 via the interface board 60. The performance analysis means 105 includes an in-cylinder combustion analysis means 106.
And an engine performance analysis means 107.

The data of each sensor is input to the personal computer 70 through an appropriate route. For example, as shown in FIG. 4, the data of the tonometer 80 is converted into a digital signal by the interface board 60 via the tonometer connector 81 and the tonometer amplifier 82 and input to the personal computer 70.
The pulse signal of the rotary encoder 20 is transmitted to the interface board 6 via the encoder connector 83.
0 is input to the personal computer 70 and used as a timing for confirming the rotational speed and measuring the in-cylinder pressure. Further, analog data such as the rotation speed and torque of the engine 3 are also converted into digital signals by the interface board 60 from the analog output connector 84 of those sensors via the cable 85 and input to the personal computer 70. The rotary encoder 20 outputs a pulse once every rotation corresponding to the rotation of the engine 3 and is used for checking the rotation speed of the engine, and outputs a pulse 360 times per rotation (every degree). The in-cylinder combustion analysis means 106 uses the signal of the rotary encoder 20 as a trigger to transmit the in-cylinder pressure of the engine 3 to the rotation of the crankshaft. Measurements are made for angles.

The throttle valve opening control device 41 changes the output of the engine 3 by controlling the throttle opening of the engine 3. Further, the dynamometer control device 56 controls the rotation speed by varying the braking torque applied to the output shaft of the engine 3,
The torque of the output shaft is measured. Then, the automatic driving means 101 sets the preset operation pattern (specifically, the throttle opening (THR: throttle valve opening) and the rotational speed (the rotational speed to be controlled by the dynamometer; REV) in chronological order. The throttle valve opening control device 41 and the dynamometer control device 56 are controlled on the basis of what is set.

Each of the indicators 31 to 4 on the measurement panel 30
3 and operation signals of various switches 51 to 59 are transmitted to the personal computer 70 via the interface board 60.
Has been entered. Then, in the personal computer 70, the data is taken in by the automatic measuring means 103, various kinds of measurement data and the like inputted by the performance analyzing means 105 are analyzed and outputted to the display 72 and the printer 73 of the personal computer 70.

Therefore, as shown in FIG.
The automatic operation of the engine 3 can be performed while the measured values such as the engine speed and the dynamometer load are displayed on the display 72. In the graph at the bottom of the screen shown in FIG. 5, a broken line 75 indicates a time change of the throttle opening (THR), and a broken line 76 indicates a rotation speed (REV).
FIG.

Further, if the data obtained by using the in-cylinder combustion analysis means 106 of the performance analysis means 105 is analyzed,
As shown in FIG. 6, the display 72 can display various analysis data, for example, a "cylinder pressure-crank angle diagram", a "cylinder pressure-volume diagram", and the like. In addition, the operation of the piston and valve in the cylinder can be reproduced by animation based on the measured data. On the other hand, if the data obtained by using the engine performance analysis means 107 is analyzed, as shown in FIG. 7, the curves for the engine speed, the output, the torque, the combustion consumption rate, the rotation speed of the net thermal efficiency and the like are set as the performance curves. It can be displayed on the display 72 or printed by the printer 73. In addition, separately from this, the analysis data can be displayed as a numerical table on the display 72 and printed by the printer 73.

A test procedure in the internal combustion engine test apparatus 1 according to the embodiment will be described. The present device 1 is especially for education, and is for letting students learn the operating principle of an internal combustion engine and the like. For this reason, a configuration and a procedure devised for education are provided. In other words, since internal combustion engines convert high-temperature, high-pressure gas into mechanical energy, it is necessary to learn and understand the relationship between heat and work and the principle of applying energy to machines. Is provided.

Further, in recent years, computers have been introduced in various fields, and it is necessary to become familiar with computers. For this reason, the operation of the personal computer 70 can be mastered by operating the engine 3, processing the data, and analyzing the data using the personal computer 70. In addition, the manual operation of the engine 3 and the data can be read by each indicator of the measurement panel 30 and manually input, so that the tester can execute the test by his / her own action rather than relying on the machine to perform data processing. The internal combustion engine test apparatus 1 is configured so that the contents can be easily learned by analyzing the data.

To perform the test, first, the operation is prepared.
Specifically, first, fuel is supplied to the fuel tank 4 and all cocks of the fuel line are opened. Then, all drain valves and the like are closed to establish a circulation path for cooling water, and the cooling water is supplied to the head tank 5. Furthermore, the circulation pump switch 5
2 and water is supplied to the engine 3 and the piping. Then, air is removed from the engine 3 and the piping.

Further, the engine lubricating oil amount and oil quality are checked before starting, the surroundings of the engine are checked, and the operation of each indicator is checked.

On the other hand, the automatic driving means 101 of the personal computer 70
And the automatic measuring means 103 is operated. The automatic driving means 101 drives the throttle valve opening control device 41 and the dynamometer control device 56 based on a pre-registered operation pattern. The operation pattern may be set by a tester (student). I can do it.

When the automatic driving means 101 is operated, the screen shown in FIG. 5 is displayed on the display 72. First, "Open (C)" in the menu "File (F)" is left-clicked with the mouse. Left-click on the file open icon 91 to read a data file in which a predetermined program pattern is recorded.

Subsequently, the throttle opening at the time of starting is set by a throttle opening set value increase / decrease button 92. 0 during warm-up
%, But when cold, the throttle opening is 5-10
Set to%. Then, when the operation start button 93 is clicked, the notes and operation instructions are displayed, and based on the display, the start switch 59 of the measurement panel 30 is turned to start the engine 3.

Until the program operation is instructed,
Manual operation is enabled by the manual operation means 102, and "MAN" in the manual operation mode is displayed. In this state, by clicking the throttle opening increase / decrease button 92 or the rotation speed increase / decrease button 94 and setting the values,
The engine 3 is driven according to the operation.

On the other hand, after the engine 3 is started, when the program operation mode button 96 is clicked, and then the [RUN] button 97 is clicked, the drive control of the engine 3 is performed according to the selected program pattern. In-cylinder combustion analysis means 106 and engine performance analysis means 1
At 07, the measurement of the data to be analyzed is automatically performed. If there is a difference between the manually set value and the initial value of the program pattern, the program operation is started by gradually changing from the manually set value to the first value of the program pattern by a preset gradient. ing.

When the [STOP] button 98 is clicked, the operation control is temporarily stopped. Clicking the [MAN] button 99 returns to the manual operation ([MAN] mode). If the mode is set to [MAN] during the program operation, the set value at the time of the program operation remains, and the control value can be changed by manual operation thereafter. further,
When returning to the [PROG] mode, the program is executed from the beginning. When the program pattern ends, the mode automatically returns to the [MAN] mode.

If there is an abnormality during operation, the emergency stop button 1
Click 00. Then, [MAN] automatically
Mode, and the throttle opening becomes 0%. If the operation of the device or the personal computer 70 becomes abnormal due to an abnormality, the operation can be stopped by pressing an emergency stop button provided on the throttle valve opening control device 41.

When the automatic operation is completed and the data measurement is completed, the measured values are stored in a data file. Click [File]-[Exit] on the menu bar.
When the engine stop operation window is displayed and the [OK] button is clicked according to the screen, the throttle opening is automatically set to 0% and the rotation speed setting is set to no load (600 rpm). Then, when "Please stop the engine" is displayed on the screen, the start switch 59 is turned to the OFF position to stop the engine 3.

The stored data is stored in the performance analysis unit 105.
In-cylinder combustion analysis means 106, engine performance analysis means 10
7, and the analysis result is displayed or printed out as shown in FIGS.

In the automatic operation screen shown in FIG. 5, when the user clicks on [Import] on the menu bar or clicks on the manual measurement button 95, the manual measurement means 104 is activated and manual measurement can be selected. At the time of normal automatic measurement, the measurement value of each sensor displayed on the indicator can be automatically taken into the personal computer 70 and stored. However, at the time of manual measurement, a data input screen is displayed on the personal computer 70, and the tester Visually observes the value displayed on each indicator and manually inputs the data using
It is configured to take in.

The data input by the manual measuring means 104 is also analyzed by the in-cylinder combustion analyzing means 106 and the engine performance analyzing means 107 and displayed as shown in FIGS. The measurement items in the internal combustion engine test apparatus 1 according to the present embodiment include the in-cylinder pressure with respect to the crank angle used by the in-cylinder combustion analysis means 106, the shaft torque and the rotation speed (dynamometer) used by the engine performance analysis means 107. ), Cooling water amount, cooling water inlet temperature, cooling water outlet temperature, fuel consumption, fuel temperature, fuel density, throttle valve opening, exhaust gas temperature, exhaust gas pressure, intake air temperature, intake air pressure, intake air amount measurement There are differential pressure, atmospheric pressure, atmospheric temperature, lubricating oil temperature, lubricating oil pressure, plug seat temperature, and the like.

Based on these measurement items (data), the in-cylinder combustion analyzing means 106 determines the in-cylinder pressure-crank angle diagram, the in-cylinder pressure-volume diagram, the in-cylinder pressure increase rate-crank angle diagram, and the heat generation. Rate-crank angle diagram, heat release-crank angle diagram, polytropic index-crank angle diagram, work shown, mean effective pressure shown, average of maximum in-cylinder pressure rise rate, transition diagram of maximum cylinder pressure, cylinder It calculates and analyzes the internal pressure maximum value frequency diagram and outputs it. On the other hand, the engine performance analysis means 107 performs performance curves (FIG. 7) with respect to the engine output (net effective work), the net thermal efficiency, the fuel consumption rate, the rotational speed of the shaft torque and the like, and numerical tables of these, the net average effective pressure, the cooling. Water loss energy, exhaust gas amount, exhaust loss energy, intake air amount, air-fuel ratio, excess air ratio, charging efficiency, volumetric efficiency,
A numerical table of general performance of the engine 3 such as mechanical loss (other loss) is calculated and analyzed and output.

According to this embodiment, the following effects can be obtained. That is, in the internal combustion engine test apparatus 1, in addition to the automatic measuring means 103 which automatically captures and processes the measured data, the tester visually observes the data displayed on the indicator and inputs the value by using a keyboard or the like. Manual measuring means 10 to be processed
4, the tester can independently (actively) perform the experiment, and the educational effect of the experiment can be enhanced.

In the internal combustion engine test apparatus 1, even in the operation mode, in addition to the automatic driving means 101, the tester can manually control the operation of the engine 3 by instructing the throttle opening and the rotation speed. Since the driving means 102 is provided, the tester can also independently (actively) perform the experiment in this respect, and the educational effect of the experiment can be enhanced.

Further, in the automatic driving means 101,
Since the tester can set and change the automatic driving program for controlling the engine 3 and the dynamometer 7, the tester can set various conditions during the automatic driving and perform experiments, further improving the educational effect. Can be enhanced. Moreover,
If the automatic driving means 101 is provided, students can concentrate on data collection and analysis during the test work, and an appropriate educational effect can be obtained.

The performance analysis means 105 can display not only the analyzed data but also a graph or an animation so that the data can be displayed in a visually easy-to-understand form, thereby further enhancing the educational effect. be able to.

Since the temperature and pressure of intake air, exhaust gas, cooling water, fuel, lubricating oil, etc. are measured, the relationship between heat and work and the principle of applying energy to machines can be learned and studied. , Especially basic theories, etc. can be easily learned.

Since the personal computer 70 is used for controlling the internal combustion engine test apparatus 1 and taking in and analyzing data, the cost can be reduced as compared with the case where a dedicated test apparatus is used, and the learning of the personal computer 70 itself can be performed. Can also help.

The performance analysis means 105 is provided by the automatic measurement means 1
03 and the manual measuring means 104 can be shared, so that the cost can be reduced accordingly.

As the internal combustion engine control means, a throttle valve opening control device 41 for controlling the throttle valve opening of the engine 3 and a dynamometer control device 56 for controlling the dynamometer 7 are provided, so that power is absorbed. By controlling the dynamometer 7 for measuring the torque by the motor, a load on the engine 3, for example, a load corresponding to the inclination angle of the road (uphill or downhill) can be given. Therefore, by controlling the throttle valve opening corresponding to the throttle (accelerator) opening and the dynamometer, it is possible to perform operation control under various conditions.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications and improvements as long as the object of the present invention can be achieved are included in the present invention. For example, the type and number of sensors and indicators for measuring various data of the engine 3 may be appropriately set in consideration of the test object and purpose.

The automatic driving means 101 and the manual driving means 102 may be provided with only one of the driving means. However, from the viewpoint of educational effect, it is preferable to provide the manual driving means 102. In addition, the arrangement, structure, and the like of the engine 3, the fuel tank 4, the head tank 5, the dynamometer 7, the measurement panel 30, and the like on the gantry 2 may be appropriately set in implementation.

[0050]

According to the internal combustion engine testing apparatus of the present invention, there is an effect that a student can easily and quickly learn the mechanism and principle of the internal combustion engine.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an internal combustion engine test apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing the internal combustion engine test apparatus of the embodiment.

FIG. 3 is a side view showing the internal combustion engine test apparatus of the embodiment.

FIG. 4 is a diagram showing a connection body of a sensor of the internal combustion engine test apparatus of the embodiment.

FIG. 5 is a view showing a screen during automatic operation of the internal combustion engine test apparatus of the embodiment.

FIG. 6 is a view showing a screen of an in-cylinder pressure data analysis result of the internal combustion engine test apparatus of the embodiment.

FIG. 7 is a diagram showing a printer output of an engine performance data analysis result of the internal combustion engine test apparatus of the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 internal combustion engine test apparatus 2 gantry 3 engine 7 dynamometer 20 rotary encoder 21 dynamometer load detector 23 fuel flow rate detector 30 measurement panel 41 throttle valve opening control device 56 dynamometer control device 59 start switch 60 interface board 70 personal computer 71 Automatic operation software 72 Display 73 Printer 74 Data analysis software 80 Acupressure meter 101 Automatic operation means 102 Manual operation means 103 Automatic measurement means 104 Manual measurement means 105 Performance analysis means 106 In-cylinder combustion analysis means 107 Engine performance analysis means

Claims (5)

[Claims] 1. A sensor for acquiring data necessary for a performance test of an internal combustion engine, an indicator for displaying data measured by each sensor, a computer capable of inputting data from each sensor, An internal combustion engine control unit for controlling the driving of the internal combustion engine, wherein the computer automatically reads and processes the data from the sensor, and processes the data displayed on the indicator and manually input. An internal combustion engine test apparatus, comprising: a manual measurement unit for performing the measurement; and a performance analysis unit for analyzing the performance of the internal combustion engine based on data input by each measurement unit. 2. The internal combustion engine test apparatus according to claim 1, wherein the computer includes an automatic operation unit that automatically controls the internal combustion engine control unit according to a preset operation program. Engine test equipment. 3. The internal combustion engine test apparatus according to claim 1, wherein the computer includes a manual operation unit that controls the internal combustion engine control unit in accordance with a setting operation performed by a tester. Internal combustion engine test equipment. 4. The internal combustion engine test apparatus according to claim 1, wherein the internal combustion engine control means controls a throttle valve opening of the internal combustion engine, An internal combustion engine test apparatus, comprising: a dynamometer control device that controls a connected dynamometer. 5. The internal combustion engine test apparatus according to claim 1, wherein the sensor is a rotational speed measurement sensor that measures a rotational speed of an output shaft of the internal combustion engine, and a power connected to the internal combustion engine. An internal combustion engine test apparatus comprising at least a load measuring sensor for measuring a load of a gauge and a finger pressure gauge for measuring a pressure in a combustion chamber of the internal combustion engine.