CN113670625A - Engine test bench - Google Patents
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- CN113670625A CN113670625A CN202110966880.8A CN202110966880A CN113670625A CN 113670625 A CN113670625 A CN 113670625A CN 202110966880 A CN202110966880 A CN 202110966880A CN 113670625 A CN113670625 A CN 113670625A
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- 238000012360 testing method Methods 0.000 title claims abstract description 88
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/08—Testing internal-combustion engines by monitoring pressure in cylinders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/12—Testing internal-combustion engines by monitoring vibrations
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Abstract
The embodiment of the invention discloses an engine test bed used for testing an engine, which comprises: a main controller, an engine control system and a sound sensor; the main controller is used for providing different engine control signals for the engine control system; the engine control system is used for controlling the engine to operate under different working conditions according to different engine control signals; the sound sensor is used for acquiring an audio signal of sound generated in the running process of the engine and converting the audio signal into a sound sensing signal; the main controller is used for determining the running states of the engine under different working conditions according to the sound sensing signals and changing the engine control signals according to the current running state of the engine. By adopting the scheme, the sound sensor is used for acquiring sound, the running state of the engine is determined through the main controller, abnormal running is sensed in the early stage of the engine failure, and the function of finding problems in advance is achieved.
Description
Technical Field
The embodiment of the invention relates to the technical field of engine durability tests, in particular to an engine test bed.
Background
In order that the performance index and the functional characteristic of the engine do not change obviously after the engine is delivered to a user for a period of time, the reliability and the durability of the engine are required to be tested after the development stage of the engine and the mass improvement of the engine, and the test is usually carried out on an engine test bench.
In the prior art, the engine test bed can set related monitoring alarm according to the normal running index of the engine, when a certain index of the system exceeds an alarm limit value, the automatic call control system can take corresponding measures such as shutdown and idling operation of the engine to the test engine or the dynamometer according to preset alarm action, and simultaneously, a siren is sounded to remind an operator on duty. However, such monitoring has certain problems: when the engine index is abnormal, even if the engine is stopped immediately when the alarm limit value is reached, the engine is damaged in many times.
How to find the problem in the early stage of engine failure is the goal pursued by the test engineer, and is also the technical problem to be solved at present.
Disclosure of Invention
In view of this, the embodiment of the present invention provides an engine test bed, so that when an engine is tested, an operation state of the engine is determined by using a sound sensor, so that a fault condition of the engine can be determined at a beginning stage of a fault of the engine, thereby achieving a purpose of finding the fault condition of the engine in advance.
The embodiment of the invention provides an engine test bed used for testing an engine, which comprises: a main controller, an engine control system and a sound sensor;
the main controller is used for providing different engine control signals for the engine control system;
the engine control system is used for controlling the engine to operate under different working conditions according to different engine control signals;
the sound sensor is used for acquiring an audio signal of sound generated in the running process of the engine and converting the audio signal into a sound sensing signal;
and the main controller is used for determining the running states of the engine under different working conditions according to the sound sensing signals and changing the engine control signals according to the current running state of the engine.
Optionally, the sound sensor comprises an electret microphone and an operational amplifier;
the electret microphone is used for acquiring an audio signal generated by the engine in real time, converting the audio signal into an electric signal and inputting the electric signal into the operational amplifier;
the operational amplifier is used for converting the electric signal into a sound sensing signal after gain adjustment is carried out on the electric signal.
Optionally, the engine test rig further comprises: an analog-to-digital converter;
the analog-to-digital converter is electrically connected between the output end of the operational amplifier and the main controller; the analog-to-digital converter is used for converting the analog quantity of the sound sensing signal into digital quantity.
Optionally, the main controller is specifically configured to:
converting the acquired time domain signal of the sound sensing signal into a frequency domain signal, determining the running state of the engine under different working conditions according to the frequency domain signal, and correcting the engine control signal according to the current running state of the engine.
Optionally, the engine test rig further comprises: a display;
the main controller is further used for controlling the display to display the frequency spectrum signal of the sound according to the frequency domain signal.
Optionally, the engine test step further comprises: an alarm;
and the main controller is also used for controlling the alarm to alarm and remind according to the sound sensing signal.
Optionally, the engine control system comprises an engine control module, an electronic throttle and a dynamometer;
the input end of the engine control module is in communication connection with the main controller; the engine control module is used for outputting a test control signal to the engine according to an engine control signal provided by the main controller;
the electronic throttle is used for outputting a throttle signal to the engine according to an engine control signal provided by the main controller;
the dynamometer is used for outputting resistance applied to the engine according to the engine control signal provided by the main controller.
Optionally, the engine control module comprises: the device comprises a measuring and calibrating unit, an electric control interface unit and an engine electric control unit;
the measurement and calibration unit is in communication connection with the main controller; the measuring and calibrating unit is used for outputting a control signal of the electric control unit according to the engine control signal;
the electronic control interface unit is electrically connected between the measuring and calibrating unit and the engine electronic control unit; the electronic control interface unit is used for transmitting the control signal of the electronic control unit to the engine electronic control unit;
the engine electronic control unit is used for outputting a test control signal to the engine according to the control signal of the electronic control unit.
Optionally, the engine test rig further comprises: an emission analyzer, a Lambda meter, a combustion analyzer, and a vibration meter;
the emission analyzer is used for measuring the exhaust condition in the running process of the engine and feeding the exhaust condition back to the main controller;
the Lambda measuring instrument is used for measuring an air-fuel ratio signal in the running process of the engine and feeding the air-fuel ratio signal back to the main controller;
the combustion analyzer is used for measuring the in-cylinder pressure and the oil pipe pressure in the running process of the engine and feeding back the in-cylinder pressure and the oil pipe pressure to the main controller;
the vibration measuring instrument is used for measuring the vibration condition of the engine in the running process and feeding the vibration condition of the engine back to the main controller;
the main controller is further configured to modify the engine control signal based on at least one of the exhaust condition, the air-fuel ratio signal, the in-cylinder pressure, and the fuel line pressure and the vibration condition.
Optionally, the Lambda measuring instrument is electrically connected to the main controller through a voltage conversion module;
the combustion analyzer is electrically connected with the main controller through a TCP/IP protocol;
and the emission analyzer performs information interaction with the main controller through a TCP/IP protocol.
According to the engine test bed provided by the embodiment of the invention, when the engine is tested, the sound sensor is used for acquiring the sound of the engine in the running process, the running state of the engine under different working conditions is determined by the main controller, the abnormal running can be sensed at the beginning of the fault of the engine, the function of finding problems in advance is realized, the damage of the engine is further reduced, and the labor cost and the time cost are also reduced.
Drawings
FIG. 1 is a schematic structural diagram of an engine test bed according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another engine test stand according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another engine test stand according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another engine test stand according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another engine test stand according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another engine test stand according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another engine test stand according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another engine test bed provided by an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for convenience of description, only a part of the structure related to the present invention is shown in the drawings, not the whole structure, and the shapes and sizes of the respective elements in the drawings do not reflect the true scale thereof, and are only for schematically illustrating the contents of the present invention.
FIG. 1 is a schematic structural diagram of an engine test bed according to an embodiment of the present invention. The engine test stand provided by the embodiment of the invention is used for testing the engine 2, and as shown in fig. 1, the engine test stand comprises a main controller 10, an engine control system 11 and a sound sensor 12. The main controller is used for providing different engine control signals for the engine control system, the engine control system is used for controlling the engine to operate under different working conditions according to the different engine control signals, and the sound sensor is used for acquiring audio signals of sound generated in the operation process of the engine and converting the audio signals into sound sensing signals.
Specifically, the main controller 10 may be, for example, a single chip microcomputer, and is capable of receiving a control instruction sent by a user or an external controller, and sending different engine control signals according to the control instruction; alternatively, where it is desired to test the engine 2, for example, to test the durability and/or functional characteristics of the engine 2, when the engine 2 is placed in a designated position on an engine test rig, the user may activate the engine test rig so that the main controller 10 outputs different engine control signals corresponding to different operating conditions of the engine. The engine control system 11 may receive the engine control signal outputted from the main controller 10, and control the engine 2 to operate under different operating conditions according to different engine control signals. The different working conditions may refer to different engine working modes, may be different working scenarios, may be speed modes, such as a high/low speed mode, may also be environmental scenarios, such as a city/highway scenario, and may also be an emergency suspension mode, such as when the engine 2 runs abnormally or has a fault, the operation of the engine 2 is emergency suspended, so as to check the fault in time and reduce the damage to the engine 2. The sound generated by the engine 2 is different from the sound generated by the engine 2 when the engine 2 is operating normally, and the current operating state of the engine 2 can be determined according to the sound generated by the engine 2, wherein the operating state refers to normal/abnormal operation of the engine 2 under the current working condition. Therefore, when the engine control system 11 controls the engine 2 to operate under different operating conditions, the audio signal generated during the operation of the engine 2 under the operating conditions can be collected by the sound sensor 12, and then the audio signal is converted into a sound sensing signal and transmitted to the main controller 10, and the main controller 10 can determine whether the engine 2 operates abnormally under the different operating conditions according to the sound sensing signal and change the engine control signal according to the current operating state of the engine 2.
For convenience of description, the following description will be given taking durability as an example.
Illustratively, when the engine test rig is to be operated to test the durability of the engine 2, the main controller 10 transmits to the test engine control system 11 information about the engine operation at that time, such as that the engine 2 has not yet started to operate, or has been operated in the first operating condition, i.e., the engine control signal. For example, the main controller 10 sends a message that the engine 2 has not started to operate, and the engine control system 11, after receiving the message, may control the engine 2 to operate at a specific speed and/or a specific torque, that is, control the engine 2 to operate in a simulation of the first operating condition and control the operation time of the engine according to the command, illustratively, control the engine 2 to operate continuously for 100 hours in the first operating condition, rest for 2 hours and then operate continuously for 100 hours, and repeat for up to 10000 hours again at intervals of 2 hours, or may also control the engine 2 to operate continuously for 5000 hours in the first operating condition. The sound sensor 12 collects sound generated when the engine 2 is operated under the first operating condition, and converts the sound into an electric signal, i.e., a sound sensing signal, which is transmitted to the main controller 10. The main controller 10 can judge the operation state of the engine 2 in the first working condition for a period of time, that is, the durability, according to the sound sensing signal output by the sound sensor 12, and then enter the durability test of the engine 2 in the next working condition, for example, the test of the engine 2 in the second working condition for a period of time, the operation time of the second working condition may be the same as or different from the operation time of the first working condition, the main controller 10 transmits the information that the engine normally operates in the first working condition and the test is completed, that is, the engine control signal is output, and the engine control system 11 repeats the above process and enters the next working condition until the durability of the engine 2 in all working conditions is tested.
It should be noted that, the above description is only exemplary of a part of the work flow of the engine test bench under the condition that the engine 2 operates normally; when the engine 2 operates abnormally under a certain working condition, the main controller 10 can sense the abnormality of the engine in time at the initial stage according to the sound sensing signal of the sound sensor 12, and then the main controller 10 can enter a corresponding working process according to a preset process.
Illustratively, when the engine 2 is normally operated under a certain condition, the sound generated by the engine 2 is stable and within a certain range, and when the engine 2 fails under the condition, the sound generated by the engine 2 at the initial stage of the failure and the sound in the stable state are different, and thus, the sound sensing signal output by the sound sensor 1 is significantly changed. The main controller 10 changes the engine control signal according to the changed sound sensing signal, and the engine control system 11 can make the engine 2 enter an emergency pause or neutral stop mode in time after receiving the changed engine control signal, so that the damage of the engine is reduced. The main controller 10 can also judge the specific position of the fault of the engine 2 according to the change degree and the change position of the sound sensing signal, thereby reducing the labor cost and the time cost.
According to the engine test bed provided by the embodiment of the invention, when the engine is tested, the sound sensor is used for acquiring the sound of the engine in the running process, the running state of the engine under different working conditions is determined by the main controller, the abnormal running can be sensed at the beginning of the fault of the engine, the function of finding problems in advance is realized, the damage of the engine is further reduced, and the labor cost and the time cost are also reduced.
FIG. 2 is a schematic structural diagram of another engine test bed provided by an embodiment of the invention. As shown in fig. 2, the sound sensor 12 includes an electret microphone 120 and an operational amplifier 121. The electret microphone 120 is configured to collect an audio signal generated by the engine 2, convert the audio signal into an electrical signal, and input the electrical signal to the operational amplifier 121, where the operational amplifier 121 is configured to perform gain adjustment on the electrical signal and convert the electrical signal into a sound sensing signal.
Illustratively, the electret microphone 120 is composed of two parts, an acoustic-electric conversion that converts acoustic vibrations into electric field variations, thereby generating an alternating voltage that varies with the acoustic waves, and an impedance conversion that reduces the impedance. The operational amplifier 121 is a circuit unit having a high amplification factor, and can amplify the captured small voltage change by about 100 times, and the amplified voltage signal is the sound sensing signal output by the sound sensor 12.
It can be understood that, by using the above scheme to detect the operation state of the engine 2, acoustic detection can be performed in the operation process of the engine 2, when the engine 2 operates under different working conditions, the sound characteristics of the engine 2 collected by the electret microphone 120 are different, and after sound-electricity conversion is performed by the electret microphone 120, sound sensing signals, namely voltage signals when the engine operates under different working conditions, when the engine operates under different working conditions are obtained, so that the acoustic index when the engine operates under different working conditions can be determined, which can be a sound wave vibration index of sound, or a voltage index amplified by the operational amplifier 121; therefore, after a plurality of tests, the corresponding sound sensing signals when the engine 2 normally operates under different working conditions can be summarized, so that the acoustic state of the engine 2 can be monitored in real time through the electret microphone 120 in the subsequent durability test, and after the acoustic state exceeds a normal index to a certain extent, the sound sensing signals output by the electret microphone 120 are subjected to operational amplification through the operational amplifier 121, and then the abnormal operation of the engine 2 can be known.
In the embodiment of the invention, the electret microphone 120 and the operational amplifier 121 are adopted, so that the tiny sound change captured by the electret microphone 120 can be subjected to operational amplification through the operational amplifier 121, the main controller 10 can conveniently identify the sound sensing signal, the accuracy of the main controller 10 in judging the fault condition of the engine 2 is improved, the problem can be found in time, the problem can be found in the early stage of the fault of the engine, and the engine is protected from being damaged or the damage degree of the engine is reduced.
FIG. 3 is a schematic structural diagram of another engine test bed provided by an embodiment of the invention. As shown in fig. 3, the engine test stand further includes an analog-to-digital converter 13, the analog-to-digital converter 13 being electrically connected between the output of the operational amplifier 121 and the main controller 10, wherein the analog-to-digital converter 13 is configured to convert an analog quantity of the sound sensing signal into a digital quantity.
For example, the analog-to-digital converter 13 may perform a/D conversion to convert an analog signal into a digital signal and convert an input voltage signal into an output digital signal. Here, the analog signal is an electric signal, and the electric signal output from the operational amplifier 121 can be converted into a binary digital signal. The main controller 10 can read the amplitude of the sound according to the digital signal output by the analog-to-digital converter 13, and determine whether the operating state of the engine 2 is normal under a certain condition.
It should be noted that the main controller 10 may change the engine control signal according to the current operating state of the engine 2 in order to change the engine operating state and enter the next stage, in addition to determining the operating state of the engine 2.
Optionally, the main controller 10 may be configured to convert a time domain signal of the acquired sound sensing signal into a frequency domain signal, determine an operation state of the engine 2 under different working conditions according to the frequency domain signal, and correct the engine control signal according to a current operation state of the engine 2.
Illustratively, the main controller 10 processes the signal using fourier transform to convert time domain information of the sound sensing signal into frequency domain information. The original time domain signal is transformed into a frequency domain signal that is easy to analyze. The method comprises the steps of collecting sound signals at the initial stage of operation of the engine 2, converting time domain signals into frequency domain signals, setting a limit value according to engineering experience, and continuously collecting and analyzing converted sound sensing signals in the real-time operation process of the engine 2. When the frequency domain information of the sound signal is changed greatly and exceeds the preset limit value, the main controller 10 immediately sends out the abnormal information of the engine, namely corrects the engine control signal and controls the engine control system 11 to control the engine 2 to execute a corresponding instruction, such as an instruction of stopping running; if the frequency domain information of the sound signal does not change greatly, after the durability test of a certain working condition is finished, the main controller 10 can send out information that the engine runs normally and the test of the working condition is finished, and the engine control system 11 enables the engine 2 to enter the next working condition for testing after receiving the engine control signal.
FIG. 4 is a schematic structural diagram of another engine test bed provided by an embodiment of the invention. As shown in fig. 4, the engine test stand further includes a display 14, and the main controller 10 is further configured to control the display 14 to display a frequency spectrum signal of sound according to the frequency domain signal. For example, the operator may visually observe the operating state of the engine 2 in combination with the visual observation of the operating state of the engine 2 based on the frequency domain information displayed on the display 14. The main controller 10 can also store the collected characteristic curve into a database through information accumulation for a certain time, and can directly judge the fault part of the engine 2 through sound signal change without visual search by an operator. And through the sound of starting 2 engine operation monitoring, can replace some other types at least sensor, collection module, can suitably reduce other check out test set, when improving the control quality, can also reduce equipment cost.
FIG. 5 is a schematic structural diagram of another engine test bed provided by an embodiment of the invention. As shown in FIG. 5, the engine test bed further comprises an alarm 15, and the main controller 10 is further configured to control the alarm to alarm according to the sound sensing signal. For example, the main controller 10 may determine the operating state of the engine 2 under different working conditions according to the sound sensing signal, and send out an alarm signal in time when the abnormal signal occurs and the engine 2 fails, so as to control the alarm to perform alarm reminding, where the alarm reminding may be in the form of lighting, flashing and/or sound reminding. The engine test bench provided by the embodiment of the invention can give an alarm when the engine runs abnormally to remind an operator of the abnormality of the engine, the abnormality of the engine test bench monitoring is not needed to be monitored manually, and the labor cost is reduced.
FIG. 6 is a schematic structural diagram of another engine test bed provided by an embodiment of the invention. As shown in FIG. 6, the engine control system 11 includes an engine control module 110, an electronic throttle 120, and a dynamometer 130. The input end of the engine control module 110 is in communication connection with the main controller 10, and the engine control module 110 is configured to output a test control signal to the engine 2 according to an engine control signal provided by the main controller 10; the electronic throttle 120 is used for outputting a throttle signal to the engine 2 according to an engine control signal provided by the main controller 10; the dynamometer 130 is used for outputting resistance applied to the engine 2 in accordance with the engine 2 control signal supplied from the main controller 10. For example, the engine control module 110 may control whether the engine 2 operates, and may also regulate and control a rotation speed and a torque of the engine 2, the electronic throttle 120 and the dynamometer 130 may assist the engine control module 110 to realize accurate regulation and control of the engine 2, and the engine control module 110, the electronic throttle 120, and the dynamometer 130 may jointly function to realize regulation and control of a working condition of the engine 2.
Illustratively, the output end of the engine control module 110 is in communication connection with the engine 2, the test control signal is a signal for the engine control module 110 to issue a control command to the engine 2 according to the test result of the engine operation state determined by the frequency domain information of the audio signal output by the main controller 10, and the test control signal is an engine control signal output by the main controller 10 for controlling the engine 2. The input ends of the electronic throttle 120 and the dynamometer 130 are also in communication connection with the main controller 10, respectively, and when the electronic throttle 120 receives an engine control signal output by the main controller 10 and the rotating speed of the engine 2 needs to be increased or decreased, the electronic throttle 120 outputs a corresponding throttle signal to add or reduce oil to the engine; when the dynamometer 130 receives the engine control signal output by the main controller 10 and needs to increase or decrease the rotation speed of the engine 2, the dynamometer 130 applies corresponding resistance to the engine, and decreases or increases the resistance. Or, when the electronic accelerator 120 and the dynamometer 130 receive the engine control signal output by the main controller 10 and the working scene of the engine 2 needs to be changed, the electronic accelerator 120 outputs a corresponding accelerator signal, and the dynamometer 130 changes the resistance output by the engine 2 to simulate the next working scene. The electronic throttle 120 and the dynamometer 130 can assist the engine control module 110 to realize accurate control of the engine 2, and can also realize more working condition possibilities, so that the engine test is closer to a real test condition, and the test result is more real and reliable.
FIG. 7 is a schematic structural diagram of another engine test bed provided by an embodiment of the invention. As shown in fig. 7, the engine control module 110 includes a measurement and calibration unit 111, an electronic control interface unit 112, and an engine electronic control unit 113. The measurement and calibration unit 111 is in communication with the main controller 10, and the measurement and calibration unit 111 is configured to output an electronic control unit control signal according to the engine control signal. The electronic control interface unit 112 is electrically connected between the measurement and calibration unit 111 and the engine electronic control unit 113, and the electronic control interface unit 112 is used for transmitting an electronic control unit control signal to the engine electronic control unit 113. The engine electronic control unit 113 is configured to output a test control signal to the engine 2 according to the electronic control unit control signal.
Specifically, the measurement and calibration unit 111 can determine the state of the engine 2 required to operate according to the engine control signal output by the main controller 10, and output a corresponding control signal of the electronic control unit; the ECU control signal is transmitted to the engine ECU 113 through the ECU 112, so that the engine ECU 113 can simulate an Electronic Control Unit (ECU) in the vehicle to operate, and output a test control signal to the engine 2 to control the operating state of the engine 2.
FIG. 8 is a schematic structural diagram of another engine test bed provided by an embodiment of the invention. As shown in FIG. 8, the engine test rig may also include an emissions analyzer 16, a Lambda meter 17, a combustion analyzer 18, and a vibration measurement 19.
The emission analyzer 16 is used to measure the exhaust gas condition during the operation of the engine 2 and feed the exhaust gas condition back to the main controller 10. For example, the exhaust condition may be the temperature of the exhaust, the exhaust pressure, and/or exhaust pollutants, among other exhaust signals. The Lambda gauge 17 may be used to measure the air fuel ratio signal during operation of the engine 2 and feed the air fuel ratio signal back to the main controller 10. The combustion analyzer 18 is configured to measure the in-cylinder pressure and the oil line pressure during the operation of the engine 2, and feed the pressure values back to the main controller 10. The vibration measuring instrument 19 is used for measuring the vibration condition of the engine 2 during operation and feeding the vibration condition of the engine back to the main controller 1. The main controller 10 may modify the engine control signal based on at least one of exhaust conditions, air-fuel ratio signals, in-cylinder pressure, and line pressure and vibration conditions.
For example, the main controller 10 may determine the operation state of the engine 2 under different working conditions according to at least one of the exhaust condition fed back by the emission analyzer 16, the air-fuel ratio signal fed back by the Lambda meter 17, the in-cylinder pressure and the oil line pressure fed back by the combustion analyzer 18, and the vibration condition fed back by the vibration meter 19, and change the engine control signal according to the current operation state of the engine 2; at least one of the exhaust condition, the air-fuel ratio signal, the in-cylinder pressure and the oil pipe pressure and vibration condition can assist the main controller 10 to determine the running state of the engine 2 under different working conditions or verify whether the test result of the engine test bench is accurate or not according to the sound sensing signal; when the main controller 10 determines that the engine 2 operates abnormally according to the sound sensing signal, a fault part of the engine 2 is searched, an operator does not need to look up the fault part visually or according to experience, and labor cost is reduced.
Optionally, the Lambda meter 17 is electrically connected with the main controller 10 through a voltage conversion module, the combustion analyzer 18 is electrically connected with the main controller 10 through a TCP/IP protocol, and the emission analyzer 16 performs information interaction with the main controller 10 through the TCP/IP protocol.
For example, the voltage conversion module may convert ac high voltage into dc low voltage to protect the main controller 10 from damage. The combustion analyzer 18 and the emission analyzer 16 may each be electrically connected to the main controller 10 via a TCP/IP protocol, which may effectively implement a communication distributable association, and which may enable the communication association between the emission analyzer 16 and the main controller 10 to be bi-directional.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An engine test rig for testing an engine, comprising: a main controller, an engine control system and a sound sensor;
the main controller is used for providing different engine control signals for the engine control system;
the engine control system is used for controlling the engine to operate under different working conditions according to different engine control signals;
the sound sensor is used for acquiring an audio signal of sound generated in the running process of the engine and converting the audio signal into a sound sensing signal;
and the main controller is used for determining the running states of the engine under different working conditions according to the sound sensing signals and changing the engine control signals according to the current running state of the engine.
2. The engine test rig of claim 1, wherein the sound sensor comprises an electret microphone and an operational amplifier;
the electret microphone is used for acquiring an audio signal generated by the engine in real time, converting the audio signal into an electric signal and inputting the electric signal into the operational amplifier;
the operational amplifier is used for converting the electric signal into a sound sensing signal after gain adjustment is carried out on the electric signal.
3. The engine test rig of claim 2, further comprising: an analog-to-digital converter;
the analog-to-digital converter is electrically connected between the output end of the operational amplifier and the main controller; the analog-to-digital converter is used for converting the analog quantity of the sound sensing signal into digital quantity.
4. The engine test rig of claim 1, wherein the master controller is specifically configured to:
converting the acquired time domain signal of the sound sensing signal into a frequency domain signal, determining the running state of the engine under different working conditions according to the frequency domain signal, and correcting the engine control signal according to the current running state of the engine.
5. The engine test rig of claim 4, further comprising: a display;
the main controller is further used for controlling the display to display the frequency spectrum signal of the sound according to the frequency domain signal.
6. The engine test step of claim 1, further comprising: an alarm;
and the main controller is also used for controlling the alarm to alarm and remind according to the sound sensing signal.
7. The engine test rig of claim 1, wherein the engine control system includes an engine control module, an electronic throttle, and a dynamometer;
the input end of the engine control module is in communication connection with the main controller; the engine control module is used for outputting a test control signal to the engine according to an engine control signal provided by the main controller;
the electronic throttle is used for outputting a throttle signal to the engine according to an engine control signal provided by the main controller;
the dynamometer is used for outputting resistance applied to the engine according to the engine control signal provided by the main controller.
8. The engine test stand of claim 7, wherein the engine control module comprises: the device comprises a measuring and calibrating unit, an electric control interface unit and an engine electric control unit;
the measurement and calibration unit is in communication connection with the main controller; the measuring and calibrating unit is used for outputting a control signal of the electric control unit according to the engine control signal;
the electronic control interface unit is electrically connected between the measuring and calibrating unit and the engine electronic control unit; the electronic control interface unit is used for transmitting the control signal of the electronic control unit to the engine electronic control unit;
the engine electronic control unit is used for outputting a test control signal to the engine according to the control signal of the electronic control unit.
9. The engine test rig of claim 1, further comprising: an emission analyzer, a Lambda meter, a combustion analyzer, and a vibration meter;
the emission analyzer is used for measuring the exhaust condition in the running process of the engine and feeding the exhaust condition back to the main controller;
the Lambda measuring instrument is used for measuring an air-fuel ratio signal in the running process of the engine and feeding the air-fuel ratio signal back to the main controller;
the combustion analyzer is used for measuring the in-cylinder pressure and the oil pipe pressure in the running process of the engine and feeding back the in-cylinder pressure and the oil pipe pressure to the main controller;
the vibration measuring instrument is used for measuring the vibration condition of the engine in the running process and feeding the vibration condition of the engine back to the main controller;
the main controller is further configured to modify the engine control signal based on at least one of the exhaust condition, the air-fuel ratio signal, the in-cylinder pressure, and the fuel line pressure and the vibration condition.
10. The engine test rig of claim 9, wherein the Lambda gauge is electrically connected to the main controller through a voltage conversion module;
the combustion analyzer is electrically connected with the main controller through a TCP/IP protocol;
and the emission analyzer performs information interaction with the main controller through a TCP/IP protocol.
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