CN211237246U - Diesel oil common rail engine detection experiment table - Google Patents

Abstract

The utility model discloses a common rail engine of diesel oil detects laboratory bench, including common rail engine of diesel oil and control cabinet, the electric part in the common rail engine of diesel oil is connected with the ECU electricity and is constituted the principle circuit, be equipped with on the control cabinet with control module, the mark that the ECU communication is connected the circuit diagram panel of principle circuit, be used for setting up the trouble setpoint that the electric part was opened a way or was opened a way, with the fault detection unit that the ECU communication is connected. The diesel common rail engine detection experiment table can describe the principle and the structure of the high-pressure diesel common rail engine in detail, and classify and simulate the fault conditions of the high-pressure diesel common rail engine so as to help automobile repair learners to quickly understand the working principle of the high-pressure diesel common rail engine, and the automobile repair learners are familiar with the basic structure and are skilled in mastering the fault phenomena and fault diagnosis and elimination technology of an electric control system of the high-pressure diesel common rail engine.

Description

Diesel oil common rail engine detection experiment table

Technical Field

The utility model relates to a technical field is repaiied to the vapour, especially relates to a diesel oil common rail engine test bench.

Background

At present, electronic control fuel injection (EFI), electronic control anti-lock braking (ABS), electronic control automatic transmission (ECT) and CAN-BUS field BUS control are widely adopted by modern automobiles. This leads to the current work of diagnosing automobile failures, focusing more on the diagnosis services of electronic failures and mechatronic failures of automobiles, and relying more on the advanced computer detection and diagnosis equipment to make judgments through comprehensive analysis technologies such as data flow analysis, waveform analysis and exhaust gas analysis.

Because the electronic device is widely applied to automobiles, each automobile is provided with several or even dozens of Electric Control Units (ECUs), dozens of sensors, actuators and the like, the difficulty of current automobile fault diagnosis is increased day by day, and some traditional automobile maintenance knowledge and experience are overturned. Therefore, the difficulty of the technical support and maintenance operation of the novel vehicle equipment lies in the diagnosis and elimination of electronic faults and electromechanical integrated faults, the novel vehicle equipment is a work with strong technical performance and strong operability, and the novel vehicle equipment provides higher requirements for comprehensive qualities such as cultural knowledge, professional theory, technical level, detection equipment use and the like of practitioners, and is a place where technical skills of the technical field of automobile application and maintenance are in short supply.

With the increase of the automobile holding capacity, the problems of energy shortage, environmental pollution and the like are brought. The energy consumption is reduced, the exhaust emission pollution is reduced, the low-carbon life is realized, the requirements of energy conservation and emission regulations are met, the development of the automobile industry in future is important, and the development of the electric control diesel engine is an important direction for solving the problem based on the performance advantages of the diesel engine. The development of the current electric control diesel automobile technology is changing day by day, and especially the electric control diesel common rail technology is an important development direction of the electric control diesel technology. The deep understanding of the electric control diesel oil common rail technology by practitioners in the automobile maintenance industry and students in various college automobile repair professions is indispensable, and in practice teaching and training, because faults are difficult to set and fault phenomena are difficult to demonstrate on a real vehicle, the learning personnel have certain difficulty in understanding.

SUMMERY OF THE UTILITY MODEL

The utility model aims at being difficult to set up trouble and demonstration trouble on the real car, having caused the problem that the study personnel have certain difficulty in the aspect of understanding to master, and provide a diesel oil common rail engine test bench. The diesel common rail engine detection experiment table can describe the principle and the structure of a high-pressure diesel common rail engine in detail, and classify and simulate the fault conditions of the high-pressure diesel common rail engine so as to help automobile maintenance learners to quickly understand the working principle of the high-pressure diesel common rail engine.

For realizing the utility model discloses a technical scheme that the purpose adopted is:

the utility model provides a diesel oil common rail engine test bench, includes diesel oil common rail engine and control cabinet, the electric device in the diesel oil common rail engine is connected with ECU (engine control unit) electricity and is constituted the principle circuit, be equipped with on the control cabinet with control module, mark that the ECU communication is connected the schematic circuit the circuit diagram panel, be used for setting up the electric device opens a way or the trouble setpoint that opens a way, with the trouble detecting element that the ECU communication is connected, wherein:

the fault detection unit comprises an electronic indicator instrument group electrically connected with the corresponding electric device, a display unit for displaying data stream or waveform or code output by the corresponding electric device and a detection terminal jack arranged on the circuit diagram panel and electrically connected with the electric device;

the fault set points are connected to an electric connection line between the electric device and a power supply VCC, each fault set point comprises a switch-on position and a switch-off position, and the switch-on or switch-off of the fault set points is controlled by a fault set button and/or an analog electromagnetic relay and/or an external plug block;

the simulation electromagnetic relays are connected to a single chip microcomputer in communication connection with the control module through a serial-parallel conversion module, the single chip microcomputer is electrically connected with a signal output end of the electric device through a digital/analog signal conversion module and a simulation signal line to perform fault simulation, the signal output end of the electric device is in communication connection with the ECU, and a power supply end of the electric device is in communication connection with the control module through a signal feedback line.

The control module and the single chip microcomputer form a control unit, the simulation electromagnetic relay can be controlled to control the fault set point to be switched between a switch-on position and a switch-off position, the fault set point can be switched between the switch-on position and the switch-off position when the fault set button is pressed and bounced, so that the corresponding electric device is in a power-on or power-off state, and in addition, external plug blocks (comprising an open circuit simulation plug, a voltage simulation knob and a resistance simulation knob) are connected to two wiring points of the switch-on position, so that voltage simulation and resistance simulation can be carried out. The model of the single chip microcomputer is ATMegA128, the model of the serial-parallel conversion module is 74LS595, and the model of the relay drive circuit is 2803.

The failure of the experiment table can be set manually, the pressing and the bouncing of a failure setting button are required to be carried out under the condition that the experiment table is electrified, the button can be controlled manually or by a PC (personal computer), and has two positions, as shown in figure 4, when the button is not pressed, the button is in a switch-on position, the failure is not set, a control module (the PC) can sense that the failure is not set through signal feedback, and PC software displays that no failure is set; when the button is manually pressed, the button is in an open circuit position at the moment, a fault is set, the PC senses the set fault through signal feedback at the moment, and the PC software displays the set corresponding fault. When the fault is eliminated, the fault button can be manually pressed to eliminate the fault, and the fault button can be reset under the control of a PC (personal computer) to eliminate the fault.

Meanwhile, the control module can perform analog control on water temperature, the position of an accelerator pedal, an air flow meter, air inlet temperature and a voltage signal of a storage battery. Firstly, the control module automatically sets the fault button to be a circuit breaking position, then an analog signal is sent to the ECU through an analog signal line, and the engine carries out analog fault operation at the moment, so that the difficulty of fault assessment is increased.

In addition, the experiment table has the functions of resistance simulation and voltage simulation, the voltage simulation is realized through a voltage simulation knob and is mainly used for simulating a voltage signal of an electronic accelerator pedal sensor, a voltage signal of an oxygen sensor and the like, the quality of the sensors can be judged through simulation, and the changes of the oil injection pulse width and the ignition timing can be observed through the display of a data stream of a decoder. The resistance simulation is realized through the resistance simulation knob, and the resistance input value can be changed by adjusting the knob at the moment. The resistance simulation is mainly used for simulating resistance value changes of water temperature signals, intake air temperature sensor signals and the like. The computer can use the software built in the PC to simulate the engine (realized by simulating the electromagnetic relay), simulate the voltage and the resistance of the signals of all electric devices (including the sensor) and quickly set the fault, and after the fault is eliminated, the fault can be recovered to the normal state only by clearing or resetting the fault through the computer software.

During fault diagnosis, static or dynamic signal detection can be performed on corresponding components of the electric control system by a comparison principle circuit through the detection terminal jacks on the fault detection points, and fault judgment or standard parameter measurement is performed by detecting signal parameters of the electric control system and combining waveforms displayed on the display unit and data on the electronic indicating instrument set.

In the above technical solution, the electric device includes a sensor, an actuator, a work relay, an ignition switch, and an ECU power supply. The sensors comprise a crankshaft position sensor, a camshaft position sensor, an air flow sensor, an electronic accelerator position sensor, a cooling water temperature sensor, a common rail pressure sensor and a fuel water content sensor; the actuator comprises an EGR control electromagnetic valve, a fuel proportional electromagnetic valve and four fuel injectors; the working relay comprises a main relay, a starting relay, a preheating plug relay, a high-speed fan relay, a low-speed fan relay and a fuel oil heating relay.

In the above technical solution, two detection terminal jacks are provided at each corresponding node, and the two detection terminal jacks are electrically connected to a point connection line between the corresponding electric device and the ECU. Respectively used for connecting two poles of a universal meter. The voltage and resistance of the electric device can be measured by detecting the terminal jacks.

In the above technical solution, the display unit includes an external decoder plugged on a diagnostic plug of the console and/or a display device in communication connection with the control unit, wherein the diagnostic plug is in communication connection with the ECU, and the fault setting point further includes a fault setting point for setting the diagnostic plug. When the diagnosis plug breaks down, the fault phenomenon that the decoding instrument cannot enter the ECU can occur. When different electric devices have faults, the corresponding fault codes are different, when the same electric device has different faults, the corresponding fault codes are different, and each fault information corresponds to one fault code.

The control module is connected with the ECU of the engine through a data line and can exchange data, so that an external decoder is not needed for code reading, code elimination, dynamic data stream reading, basic setting and operation of an end effector. These functional items will be displayed through the display of the computer (control module), and more intuitive, comprehensive. Meanwhile, a diagnosis port (diagnosis plug) arranged on an operation display panel of the practical training platform can be connected with a decoder and used for clearing and reading fault codes, reading dynamic data streams, basically setting and operating a terminal actuator, and after a fault is set or eliminated, an ignition switch is closed, and a computer or the decoder is used for code elimination.

The display device has the basic operation visual function and the function of an oscilloscope, can detect the signals of each sensor in the running process of the engine and read the waveforms of the sensors, is convenient to observe the waveforms of the sensors and compare and judge fault waveforms with non-fault waveforms, and solves and eliminates faults.

In the technical scheme, the console is provided with an ignition switch to control the switch of the diesel common rail engine, the console is provided with a safety seat and an instrument panel which are electrically connected with the principle circuit, and the instrument panel is used for displaying the rotating speed information of the diesel common rail engine.

The ignition switch is rotated to a starting gear, a starter is operated (the maximum time can last for 5 seconds), a key is released immediately after the engine is operated, and the engine is started. To shut the engine off, the ignition switch may be rotated to an off position to shut the engine off.

The engine can be shut down or started through the built-in software of the control module (PC), the PC is powered on, the machine is turned on by pressing the start button, then the matched detection software is clicked by a mouse to enter the control end, the engine is clicked by the mouse to start, a starting signal of an ignition switch can be simulated to the ECU, and the manual remote starting control of the engine is realized. When a shutdown button is clicked, the PC machine gives a shutdown signal to the ECU of the engine, so that the oil cut-off of the engine can be realized, and the engine is shut down to stop running rapidly.

In the above technical solution, the control module is a PC on the console, and the display device is a PC display screen fixed on the console or an external display connected to the PC in a communication manner.

In the above technical solution, the PC may be externally connected with an output device and/or an input device, the output device is one or more of a projector, a printer, and a display, and the input device is one or more of a keyboard, a mouse, and a microphone.

The diesel common rail engine detection experiment table can adapt to various teaching situations by the aid of the external output equipment and/or the external input equipment, and teaching courseware in a PC can be displayed, watched and learned by the aid of an external projector.

In the technical scheme, the console and the diesel common rail engine are fixed on the support rack, the support rack is fixedly connected with the stainless steel tube guard bar, the stainless steel tube guard bar is positioned around the diesel common rail engine, the bottom of the support rack is provided with the movable caster, and the movable caster is provided with the locking device.

In the technical scheme, a control system theoretical knowledge teaching system and a control system theoretical knowledge assessment system are stored in the control module.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the diesel common rail engine detection experiment table follows the basic principle of electromechanical liquid, precision and complex electronic control system fault diagnosis, realizes the organic combination of artificial fault setting and system self-diagnosis, can simulate the fault condition of a high-pressure diesel common rail engine, and performs fault setting, detection and elimination, so that a student does not need to perform drilling study on a real vehicle, and the fault diagnosis and elimination technology of the diesel common rail engine can be improved.

2. The comprehensive multi-media teaching mode and platform of the 'live-action and simulated live-action' of the diesel common rail engine are created, the contradiction that the training content of the automobile repair is far from the industrial demand is favorably solved, the experiment table integrates theoretical teaching, on-site observation and practice operation skill training, the applicability, the comprehensiveness and the practicability of the teaching content and the teaching method are highlighted, and the manual ability of automobile repair personnel and the capability of analyzing and solving problems are favorably improved.

3. The diesel common rail engine detection experiment table visually shows the working principle of the high-pressure diesel common rail engine through a circuit diagram panel which is drawn on the surface of a control table and is consistent with an original engine control system, and is convenient for students to understand;

4. according to the diesel common rail engine detection experiment table, learning software is arranged in a PC (personal computer), so that students can conveniently learn the working principle and the basic structure of a high-pressure diesel common rail engine, the fault detection and elimination technology can be improved through simulation drilling, and the learning condition can be checked through the software.

Drawings

Fig. 1 is a schematic structural diagram of a common rail diesel engine test bench.

FIG. 2 is a schematic diagram showing the display screen, electronic indicator and circuit diagram panel of the PC of FIG. 1 distributed on a console;

fig. 3 is a schematic diagram of the circuit diagram panel of fig. 1.

Fig. 4 is a schematic diagram of a fault set point.

Fig. 5 is a schematic diagram of the connection of the analog relay to the control unit.

FIG. 6 is a main interface of a PC control system of a common rail diesel engine testing experiment table.

FIG. 7 is a PC control system fault setting interface of a common rail diesel engine detection experiment table.

FIG. 8 is a theoretical knowledge explanation interface of a PC control system of a common rail diesel engine testing experiment table.

FIG. 9 is an animation demonstration interface of a PC control system of a common rail diesel engine testing experiment table.

FIG. 10 is a theoretical knowledge assessment system interface of a PC control system of a common rail diesel engine testing experiment table.

In the figure: 1. a console; 2, displaying screen of PC; 3, a PC machine; 4. a fault set button; 5. a safety seat; 6. a diagnostic plug; 7. an ignition switch; an ECU; 9. a support stand; 10. moving the caster; 11. a stainless pipe guardrail; 12. a diesel common rail engine; 13, an instrument panel; 14. a circuit diagram panel; 15. detecting a terminal jack; 16. an electronic indicating instrument cluster.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

A diesel common rail engine detection experiment table is shown in figure 1 and comprises a diesel common rail engine 12 and a control table 1, wherein electric devices in the diesel common rail engine 12 are electrically connected with an engine control unit ECU8 to form a principle circuit,

the console 1 is provided with a control module in communication connection with the ECU8, a circuit diagram panel 14 for indicating the principle circuit, a fault setting point for setting the open circuit or the broken circuit of the electric device, and a fault detection unit in communication connection with the ECU8, wherein:

the fault detection unit comprises an electronic indicator instrument cluster 16 electrically connected with the corresponding electric devices, a display unit for displaying data streams or waveforms or codes output by the corresponding electric devices, and a detection terminal jack 15 arranged on the circuit diagram panel 14 and electrically connected with the electric devices;

as shown in fig. 4, the fault set points are arranged between the electric device and the power supply VCC, each fault set point includes an on position and an off position, and the on or off of the fault set point is controlled by a fault set button 4 and/or an analog electromagnetic relay and/or an external plug;

as shown in fig. 5, a plurality of the analog electromagnetic relays are connected to a single chip microcomputer which is in communication connection with the control module through a serial-parallel module, the single chip microcomputer is connected to a connection line between a signal output end of the electric device and the ECU8 through a digital/analog signal conversion module and an analog signal line, a power supply end of the electric device is in communication connection with the control module through a signal feedback line, and a signal output end of the electric device is in communication connection with the ECU 8. The model of the single chip microcomputer is ATMegA128, the model of the serial-parallel conversion module is 74LS595, and the model of the relay drive circuit is 2803.

The diesel common rail engine 12 is a main body device of the experiment table, a principle circuit diagram consistent with an original engine control system is engraved on a panel of the control table 1, and as shown in fig. 3, the principle circuit diagram is embodied on the panel and can be beneficial to more intuitive learning. The connecting lines of the sensor and the actuator and the main circuit line are carved by a nicking tool.

The control module and the single chip microcomputer form a control unit, the simulation electromagnetic relay can be controlled to control the fault set point to be switched between a switch-on position and a switch-off position, the fault set point can be switched between the switch-on position and the switch-off position when the fault set button 4 is pressed and bounced, so that the corresponding electric device is in a power-on or power-off state, and in addition, the external plug blocks are connected to two wiring points of the switch-on position and comprise an open-circuit simulation plug, a voltage simulation knob and a resistance simulation knob, so that voltage simulation and resistance simulation can be carried out. Besides the physical fault setting mode, the control module can also send a simulation fault signal to the signal output end of the electric device to perform simulation fault setting. Specifically, the fault of the experiment table can be set manually, the fault setting button 4 is pressed and bounced under the condition that the experiment table is electrified, the button can be controlled manually or by a PC (personal computer) as shown in FIG. 7, the button has two positions, when the button is not pressed, the button is in a connection position, the fault is not set, the PC of the control module can sense that the fault is not set through signal feedback, and the PC software displays that no fault is set; when the button is manually pressed, the button is in an open circuit position at the moment, a fault is set, the PC senses the set fault through signal feedback at the moment, and the PC software displays the set corresponding fault. When the fault is eliminated, the fault button can be manually pressed to eliminate the fault, and the fault button can be reset under the control of a PC (personal computer) to eliminate the fault.

Meanwhile, the control module can perform analog control on water temperature, the position of an accelerator pedal, an air flow meter, air inlet temperature and a voltage signal of a storage battery. Firstly, the control module automatically sets the fault button to be a circuit breaking position, then an analog signal is sent to the ECU through an analog signal line, and the engine carries out analog fault operation at the moment, so that the difficulty of fault assessment is increased.

In addition, the external plug block comprises an open circuit simulation plug, a voltage simulation knob and a resistance simulation knob so as to realize the functions of resistance simulation and voltage simulation, the voltage simulation is realized through the voltage simulation knob and is mainly used for simulating voltage signals of an electronic accelerator pedal sensor, voltage signals of an oxygen sensor and the like, the sensor can be judged whether the sensor is good or not through simulation, and the change of the oil injection pulse width and the ignition timing can also be observed through the display of data flow of a decoder. The resistance simulation is realized through the resistance simulation knob, and the resistance input value can be changed by adjusting the knob at the moment. The resistance simulation is mainly used for simulating resistance value changes of water temperature signals, intake air temperature sensor signals and the like. The computer can use the software built in the PC to simulate the engine and realize the simulation operation through the simulation electromagnetic relay, carry out the voltage and resistance simulation on the signal of each sensor and quickly set the fault, and after the fault is eliminated, the fault can be recovered to the normal state only by clearing or resetting the fault through the computer software.

During fault diagnosis, static or dynamic signal detection can be performed on corresponding components of the electric control system by a comparison principle circuit through the detection terminal jacks on the fault detection points, and fault judgment or standard parameter measurement is performed by detecting signal parameters of the electric control system and combining waveforms displayed on the display unit and data on the electronic indicating instrument set.

Preferably, the electric devices comprise a sensor, an actuator, a working relay, an ignition switch and an ECU power supply (ECU + and ECU-); the sensors comprise a crankshaft position sensor, a camshaft position sensor, an air flow sensor, an electronic accelerator position sensor, a cooling water temperature sensor, a common rail pressure sensor and fuel water content sensors (7); the actuator comprises an EGR control electromagnetic valve, a fuel proportional electromagnetic valve and four fuel injectors (6); the working relay comprises a main relay, a starting relay, a preheating plug relay, a high-speed fan relay, a low-speed fan relay and a fuel oil heating relay (5).

Therefore, the experiment table is provided with 30 effective fault points, wherein the number of the effective fault points is 7 when an engine sensor fails, the number of the effective fault points is 6 when an engine actuator fails, the number of the engine relay fails is 5 when an engine ECU fails, the fault setting of a single or a plurality of sensors, actuators and the engine ECU can be realized through the fault setting switch arranged outside the experiment table, and the fault can be removed and set by a PC.

The machine is provided with two fault setting areas:

1 open circuit setting area:

the computer terminal leading-out port below the operation display panel is an open circuit setting area, the outer edge of the plug is a sensor connecting line point, the inner edge of the plug is a computer connecting line point, when the fault setting is carried out, after the ignition switch is closed, only the plug of the corresponding terminal leading-out port of the computer needs to be pulled down, and the open circuit fault can be caused by replacing a special open circuit simulation plug, and after the fault setting is carried out, the fault lamp can be lightened under the conditions that the ignition switch is switched on and the engine is in the running state.

2 open circuit setting area:

a computer cabinet under the operation display panel; the device is provided with a circular plate type button, and fault points are set by open circuits of circuits such as an engine oil high-voltage display, an engine oil low-voltage display, an anti-theft lamp, a starter, a fuel pump, a fuel oil level display, a fan, a water temperature display, a water level display, a storage battery charging indication and a time display meter so as to facilitate teaching and fault setting.

Short circuit setting faults are not advocated, and if a short circuit setting mode is adopted, possible components are damaged.

Preferably, two detection terminal insertion holes 15 are provided for each detection terminal insertion hole 15, and the two detection terminal insertion holes 15 are provided between the corresponding electric device and the ECU8, and are respectively used for connecting two poles of a multimeter.

Preferably, the display unit includes an external decoder plugged into the diagnostic plug 6 of the console 1 and/or a display device communicatively connected to the control unit, wherein the diagnostic plug 6 is communicatively connected to the ECU 8.

When the diagnosis plug 6 is in fault, the fault phenomenon that the decoding instrument cannot enter the ECU can occur. When different electric devices have faults, the corresponding fault codes are different, when the same electric device has different faults, the corresponding fault codes are different, and each fault information corresponds to one fault code.

The control module is connected with the ECU of the engine through a data line and can exchange data, so that an external decoder is not needed for code reading, code elimination, dynamic data stream reading, basic setting and operation of an end effector. The functional items are displayed through a display of the computer control module, and are more visual and comprehensive. Meanwhile, the diagnosis port diagnosis plug arranged on the operation display panel of the practical training platform can be connected with a decoder and used for clearing and reading fault codes, reading dynamic data streams, basically setting and operating a terminal actuator, closing an ignition switch after setting faults or eliminating faults, and eliminating the codes by using a computer or the decoder.

The decoder is used for clearing and reading fault codes, reading dynamic data streams, and executing basic setting and operation of an end effector. If the fault is eliminated, the ignition switch of the diesel common rail engine 12 is closed, and the code is eliminated by using a decoder. The controller is connected with the control unit ECU8 through a data line, can exchange data, does not need an external decoder, reads codes, eliminates the codes, reads dynamic data streams, executes basic setting and operates the terminal actuator, and the functions can be displayed through a display, so that the functions are more visual and comprehensive.

The display device has the basic operation visual function and the function of an oscilloscope, can detect the signals of each sensor in the running process of the engine and read the waveforms of the sensors, is convenient to observe the waveforms of the sensors and compare and judge fault waveforms with non-fault waveforms, and solves and eliminates faults.

Preferably, the console 1 is provided with an ignition switch 7 for controlling the on/off of the diesel common rail engine 12. When the ignition switch is rotated to a starting gear, the key is released immediately after the starter is operated for 5 seconds at most, and the engine is started. To shut the engine off, the ignition switch may be rotated to an off position to shut the engine off. Preferably, the control module is a PC 3 on the console 1, the engine can be turned off or started through built-in software of the control module PC, the PC is powered on, the start button is pressed to turn on the engine, then the mouse is used for clicking matched detection software to enter a control end, the mouse is used for clicking to start the engine, a starting signal of an ignition switch can be simulated to the ECU, and the manual remote control of starting the engine is realized. When a shutdown button is clicked, the PC machine gives a shutdown signal to the ECU of the engine, so that the oil cut-off of the engine can be realized, and the engine is shut down to stop running rapidly.

Preferably, the console 1 is provided with a safety seat 5 electrically connected to the principle circuit and an instrument panel 13 for displaying the rotation speed information of the diesel common rail engine 12, wherein the instrument panel is used for displaying the rotation speed information of the diesel common rail engine.

Preferably, the control module is a PC 3 on the console 1, and the display device is a PC display screen 2 fixed on the console 1 or an external display in communication connection with the PC 3.

Preferably, the PC 3 may be externally connected with an output device and/or an input device, the output device is one or more of a projector, a printer, and a display, and the input device is one or more of a keyboard, a mouse, and a microphone.

The setting of external output device and input device makes this diesel oil common rail engine test bench can adapt to multiple teaching situation, and for example external projecting apparatus can demonstrate, watch and study the teaching courseware in the PC 3, and keyboard and mouse can improve the convenience of controlling. The PC 3 is combined with teaching courseware and teaching software matched with the experiment table, and real-physical integrated teaching can be realized.

Example 2

On the basis of embodiment 1, the fixing structure thereof is described.

As shown in fig. 1, the console 1 and the diesel common rail engine 12 are fixed to a support stand 9. Fixedly connected with stainless steel pipe guardrail 11 on the supporting rack 9, stainless steel pipe guardrail 11 is located around diesel oil common rail engine 12, movable foot wheel 10 is installed to the bottom of supporting rack 9, be provided with locking means on the movable foot wheel 10.

For the convenience of moving the experiment table, four corners of the experiment table are provided with movable trundles 10, and for the sake of safety, the front trundles are provided with locking devices to prevent the experiment table from freely sliding.

Example 3

This embodiment is based on embodiment 1-2, and specifically describes the built-in software of the PC.

Preferably, a control system theoretical knowledge teaching system and a control system theoretical knowledge assessment system are stored in the control module.

The PC 3 is internally provided with teaching courseware which can be used by an external projector. As shown in fig. 8, courseware explains the functions and working principles of each part of the diesel common rail engine 12 and the structure thereof in detail, explains the structures, principles, functions and maintenance of each sensor of the electric control part in detail, and can turn on the PC 3 for watching and learning when operating the experiment table. As shown in fig. 9, the relevant sensors, actuators and their principles in the courseware are animated for FLASH software. The animation shows the structure and the working principle of each sensor, the fault detection mode and the like, and the control button is arranged to control playing and pausing of the animation.

In the embodiment, the software built in the PC 3 enables a user to start the PC 3 only when the engine is not started, and the software performs simulation of various faults, so that the user has a sense of being personally on the scene through demonstration of 3D animation and various videos, and can learn the theory, structure, and disassembly and assembly of the diesel common rail engine 12 through the software. The software has a training function, fault diagnosis and elimination can be performed in the software by using a multimeter, a decoder and an oscilloscope in the software, the use, maintenance and repair cost of the engine of the experiment table is saved, and emission pollution caused by frequent starting of the engine 12 in use is reduced.

In this embodiment, the examination system is included in the software of the PC 3, and the question bank is written, as shown in fig. 10. The question bank comprises blank filling questions, single item selection questions, judgment questions and analysis questions. After the experiment table is studied and researched in a certain stage, students can be examined through the built-in question bank of the PC 3, and deficiency and missing points in the study can be found out through examination.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The utility model provides a diesel oil common rail engine test bench, its characterized in that includes diesel oil common rail engine (12) and control cabinet (1), the electric device in diesel oil common rail engine (12) is connected with ECU (8) electricity and is constituted the principle circuit, be equipped with on control cabinet (1) with control module, mark that ECU (8) communication is connected the schematic circuit the circuit diagram panel (14), be used for setting up the electric device opens a way or the trouble setpoint that opens a way, with the trouble detecting element that ECU (8) communication is connected, wherein:

the fault detection unit comprises an electronic indicator instrument group (16) electrically connected with the corresponding electric devices, a display unit for displaying data streams or waveforms or codes output by the corresponding electric devices and a detection terminal jack (15) arranged on the circuit diagram panel (14) and electrically connected with the electric devices;

the fault set points are connected to an electric connection line between the electric device and a power supply VCC, each fault set point comprises a switch-on position and a switch-off position, and the switch-on or switch-off of the fault set points is controlled by a fault set button (4) and/or an analog electromagnetic relay and/or an external plug block;

the simulation electromagnetic relays are connected to a single chip microcomputer in communication connection with the control module through a serial-parallel conversion module, the single chip microcomputer is electrically connected with a signal output end of the electric device through a digital/analog signal conversion module and a simulation signal line to perform fault simulation, the signal output end of the electric device is in communication connection with the ECU (8), and a power supply end of the electric device is in communication connection with the control module through a signal feedback line.

2. The diesel common rail engine test bench of claim 1, wherein the electric devices comprise a sensor, an actuator, an operating relay, an ignition switch, and an ECU power supply; the sensors comprise a crankshaft position sensor, a camshaft position sensor, an air flow sensor, an electronic accelerator position sensor, a cooling water temperature sensor, a common rail pressure sensor and a fuel water content sensor; the actuator comprises an EGR control electromagnetic valve, a fuel proportional electromagnetic valve and four fuel injectors; the working relay comprises a main relay, a starting relay, a preheating plug relay, a high-speed fan relay, a low-speed fan relay and a fuel oil heating relay.

3. The common rail diesel engine test bench of claim 1, wherein there are two test terminal insertion holes (15) each, and the two test terminal insertion holes (15) are electrically connected to a point connection line between a corresponding electric device and the ECU (8) for connecting two poles of a multimeter, respectively.

4. The diesel common rail engine test bench of claim 1, wherein the display unit comprises an external decoder plugged on a diagnosis plug (6) of the console (1) and/or a display device in communication connection with the control module, wherein the diagnosis plug (6) is in communication connection with the ECU (8), and the fault set point further comprises a fault set point for setting the diagnosis plug.

5. The diesel common rail engine detection experiment table of claim 1, wherein the control table (1) is provided with an ignition switch (7) for controlling the switch of the diesel common rail engine (12), the control table (1) is provided with a safety seat (5) and an instrument panel (13) which are electrically connected with the principle circuit, and the instrument panel (13) is used for displaying the rotating speed information of the diesel common rail engine.

6. The diesel common rail engine test bench of claim 1, wherein the external plug block comprises an open circuit analog plug, a voltage analog knob, and a resistance analog knob.

7. The common rail diesel engine test bench of claim 4, wherein the control module is a PC (3) on the console (1), and the display device is a PC display screen (2) fixed on the console (1) or an external display in communication connection with the PC (3).

8. The diesel common rail engine test bench of claim 7, wherein the PC (3) is externally connected with one or more of an output device and/or an input device, the output device is one or more of a projector, a printer and a display, and the input device is one or more of a keyboard, a mouse and a microphone.

9. The diesel common rail engine test bench of claim 1, wherein the console (1) and the diesel common rail engine (12) are fixed on a support bench (9), a stainless pipe guardrail (11) is fixedly connected to the support bench (9), and the stainless pipe guardrail (11) is located around the diesel common rail engine (12).

10. The diesel common rail engine test bench of claim 9, wherein a movable caster (10) is mounted on the bottom of the support bench, and a locking device is disposed on the movable caster (10).

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