An electrical performance test bench and test method for a motor vehicle air conditioning unit

Abstract

The invention discloses an electric performance test bench and a test method for an air-conditioning unit of a motor vehicle, comprising a test room and a control room. The test room is used for placing an air-conditioning unit to be tested for testing. A control console and an air-conditioning display setter are arranged in the control room. The control console comprises an industrial computer, a computer and a printer. The industrial computer comprises a PLC control system. The PLC control system comprises a voltage and current acquisition system and a temperature regulation and temperature acquisition system. The invention ensures the normal operation of the air-conditioning unit to be tested by setting a connecting mechanism and a PLC control system, makes the test data of the air-conditioning unit to be tested more accurate, improves the automation degree of the test process, greatly improves the efficiency of the test bench for the electrical performance test of the air-conditioning unit, and successfully realizes the significant improvement of the security of the database in the test bench by setting an encryption algorithm, thereby greatly improving the credibility of the test report obtained from the database and greatly improving the reference value.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioner electrical performance detection, and in particular to an electric vehicle air conditioner unit electrical performance test bench and a test method. Background Art

[0002] There are many types of air conditioners. According to different usage scenarios, they can be divided into household air conditioners, industrial air conditioners and vehicle air conditioners. During the research and development process of air conditioners, it is necessary to conduct electrical performance testing on the entire air conditioner to determine the effect of the research and development and whether it is worth large-scale production.

[0003] At present, the air-conditioning models suitable for passenger compartments and driver's cabs of EMUs mainly include passenger compartment air-conditioners such as EU651 series, EU691 series, HUA502-1, HUA502-1A, EUB502-2, and driver's cab air-conditioners such as KLF4.9E and KLF4.9BZ-E. Under normal circumstances, the above-mentioned different types of air-conditioners can be tested through a test bench. Among them, the test bench is mostly manually controlled, and the test personnel are required to control the test bench according to the process, so as to conduct electrical performance tests on the above-mentioned air-conditioners. During the test, the test personnel need to give operations and judgments, and finally fill in the test data in the test report.

[0004] Although the manual control test bench can accurately control each step of the test process and finally obtain various experimental data for the electrical test of the EMU air-conditioning unit at a low cost, the entire test process requires skilled test personnel to operate, and the initial training cost is high. In addition, due to manual operation and recording, many repetitive operations during the test process will waste the time of the test personnel, making the overall test efficiency low. Moreover, since most of the test data are first filled in on paper and then entered into the computer, it is easy to make mistakes and be tampered with, resulting in low data reliability. Summary of the invention

[0005] The purpose of the present invention is to provide an electrical performance test bench and test method for a motor vehicle air conditioning unit to solve the problems raised in the above-mentioned background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An electrical performance test bench for a motor vehicle air-conditioning unit comprises a test room and a control room. The test room is used to place an air-conditioning unit to be tested for testing. The control room is used to control the testing process of the air-conditioning unit to be tested. A control console and an air-conditioning display setter are arranged in the control room. The control console comprises an industrial computer, a computer and a printer. The industrial computer comprises a PLC control system. The PLC control system comprises a voltage and current acquisition system and a temperature regulation and temperature acquisition system. The air-conditioning display setter is connected to the air-conditioning unit to be tested placed in the test room and is used to set various control modes of the air-conditioning unit to be tested.

[0008] Preferably, a power supply system is also provided in the control room, the power supply system is connected to the air conditioner to be tested placed in the test room and supplies power to it, and the power supply system is also connected to the power supply of the factory building.

[0009] Preferably, the voltage and current acquisition system includes a comprehensive electricity meter and a clamp-on current transformer, the comprehensive electricity meter is used to detect the total voltage and total current of the air conditioner to be tested, and the clamp-on current transformer is used to monitor the voltage and current of the compressor, blower and condensing fan in the air conditioner to be tested in real time.

[0010] Preferably, the temperature regulation system includes a refrigerator and an industrial heater, and the temperature acquisition system includes an ambient temperature sensor, an air outlet temperature sensor, and a return air outlet temperature sensor.

[0011] Preferably, a connecting mechanism is also provided in the test room for gas circulation in the test room, the connecting mechanism includes a fixed side frame fixedly connected to the wall of the test room, the top of the fixed side frame is fixedly connected with a top air duct, the lower part of the top air duct is fixedly connected with a soft-connection air duct, the bottom of the soft-connection air duct is fixedly connected with an air outlet test fixture, the air outlet test fixture is detachably fixedly connected to the air conditioner to be tested, and the air conditioner to be tested is detachably fixedly connected with a return air outlet test fixture.

[0012] Preferably, it also includes test system software, which is installed in a computer. The computer also includes a display for displaying control and detection data of the air conditioner to be tested during the test process, test transcripts and other information. The test system software includes a test implementation module, a hardware correction module, a data management module, and a user login module. The test implementation module is used to control the PLC control system to perform electrical tests on the air conditioner to be tested. The hardware correction module is used to calibrate the comprehensive electricity meter, clamp-on current transformer, ambient temperature sensor, air outlet temperature sensor, and return air temperature sensor before the test. The data management module is used to collect, process and store current, voltage and temperature data of the air conditioner to be tested during the test. The user login module is used to identify the identity of the logged-in user.

[0013] Preferably, the user login module includes three levels of user identities, each with a password, namely administrator, engineer, and operator. The administrator has the highest authority and can modify all contents, which is mainly used for debugging the test bench. The engineer has the authority to set the process parameters of the test bench and conduct tests. He can modify the process parameters but cannot modify the parameters set during debugging of the test bench. The operator has the authority to operate the test bench and must operate according to the set process parameters. The data management module includes a database for storing the original data of the test. The database includes a confidentiality algorithm to prevent the original data of the test from being tampered with.

[0014] Preferably, the encryption algorithm includes the following steps: In the first step, when the user logs in to the test system software as an administrator and accesses the database, the database will automatically generate a string of random numbers, namely ABCDEFG, and automatically send another string of random numbers abcdefg to another user with an administrator identity. In the second step, the user inputs abcdefg from another user into the encryption algorithm, and also needs to obtain the key OoOOOoo from a third user with an administrator identity. The key is "O", which represents a value taken from the first group of random numbers, and "o", which represents a value taken from the second group of random numbers. The third user will regain a new key composed of "O" and "o" after each key is used. In the third step, the user inputs the key obtained from the third user into the encryption algorithm, and the database access password AbCDEfg can be obtained after calculation. The user can access the database, and at the same time, the access password will be sent to the other two users mentioned above.

[0015] A test method for an electrical performance test bench for an air conditioner set of a motor vehicle comprises the following steps: a first step, transporting an air conditioner to be tested to a test room, fixing a return air outlet test fixture at the return air outlet of the air conditioner to be tested by bolts, lifting the air outlet test fixture, the soft connection air duct will be compressed, aligning the lower outlet of the air outlet test fixture with the air outlet, and the placement of the air conditioner to be tested can be completed; a second step, controlling the setting of the cooling mode or heating mode of the air conditioner to be tested by an air conditioner display setter; a third step, the power supply system in the control room will supply power to the air conditioner to be tested; a fourth step, starting the air conditioner to be tested, and starting a voltage and current acquisition system and a temperature adjustment and temperature acquisition system; a fifth step, a data management module will continuously collect the current, voltage and temperature data of the air conditioner to be tested during the test, and process the data into a test report, which can be output through a printer, and finally stored in a database and encrypted by an encryption algorithm.

[0016] Beneficial effects of the present invention:

[0017] Through the setting of the connecting mechanism and the PLC control system, the opening of the top air duct can be changed according to the mode of the air conditioner to be tested, so that the temperature of the test room will not be overheated, thereby affecting the normal operation of the air conditioner to be tested, and the test data of the air conditioner to be tested is made more accurate. The voltage and current acquisition system and the temperature adjustment and temperature acquisition system are used to automatically adjust the test process and collect information, so that the degree of automation of the entire test process is greatly improved, and the efficiency of the test bench for the electrical performance test of the air conditioner is greatly improved. The mechanism is streamlined and efficient, the test operation is convenient, and it has a large application prospect.

[0018] Through the setting of encryption algorithm, when accessing the database, close cooperation of three users with administrator status is required. By listing the company, customer, and third party using this test bench as these three users and supervising each other, the database is prevented from being easily accessed and tampered with. Each update of the key will not only leave a trace, which is convenient for later verification, but also ensure that the encryption level of the database will not be reduced due to the publication of the key. The security of the database in this test bench has been significantly improved, thereby greatly improving the credibility of the test reports obtained from the database and the reference value. The algorithm is cleverly designed, the key is concise and easy to remember, and it has a high application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of the test bench in the present invention;

[0021] Figure 2 It is a structural schematic diagram of the connecting mechanism in the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the test system software in the present invention.

[0023] In the figure: 1. Air conditioner to be tested; 2. Return air vent test fixture; 3. Air outlet test fixture; 4. Fixed side frame; 5. Soft-connected air duct; 6. Top air duct. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] Reference Figure 1As shown, the present invention is an electrical performance test bench for a motor vehicle air-conditioning unit, comprising a test room and a control room. The test room is used to place an air conditioner 1 to be tested for testing, and the control room is used to control the test process of the air conditioner 1 to be tested. A control console and an air conditioner display setter are arranged in the control room. The control console comprises an industrial computer, a computer, and a printer. The industrial computer comprises a PLC control system. The PLC control system comprises a voltage and current acquisition system and a temperature regulation and temperature acquisition system. The air conditioner display setter is connected to the air conditioner 1 to be tested placed in the test room and is used for setting various control modes of the air conditioner 1 to be tested.

[0027] It should be noted that a power supply system is also provided in the control room. The power supply system is connected to the air conditioner 1 to be tested placed in the test room and supplies power to it. The power supply system is also connected to the factory power supply. The power supply system can be composed of AC400 power supply, AC100 power supply, and DC100 power supply. The factory power supply can use AC380, 50Hz power supply.

[0028] The voltage and current acquisition system includes a comprehensive electricity meter and a clamp-on current transformer. The comprehensive electricity meter is used to detect the total voltage and total current of the air conditioner 1 to be tested. The clamp-on current transformer is used to monitor the voltage and current of the compressor, the blower and the condensing fan in the air conditioner 1 to be tested in real time. The temperature regulation system includes a refrigerator and an industrial heater. The temperature acquisition system includes an ambient temperature sensor, an air outlet temperature sensor and a return air outlet temperature sensor. Among them, the ambient temperature sensor includes one installed on the outer wall of the test room and one installed inside the test room. The air outlet temperature sensor is installed on the air outlet test fixture 3, and the return air outlet temperature sensor is installed on the return air outlet test fixture 2.

[0029] Reference Figure 2 As shown, a connecting mechanism is also provided in the test room for gas circulation in the test room, and the connecting mechanism includes a fixed side frame 4 fixedly connected to the wall of the test room, a top air duct 6 is fixedly connected to the top of the fixed side frame 4, a soft-connection air duct 5 is fixedly connected to the lower part of the top air duct 6, an air outlet test fixture 3 is fixedly connected to the bottom of the soft-connection air duct 5, the air outlet test fixture 3 is detachably fixedly connected to the air conditioner 1 to be tested, and a return air outlet test fixture 2 is detachably fixedly connected to the air conditioner 1 to be tested.

[0030] Through the setting of the connecting mechanism and the PLC control system, the opening of the top air duct 6 can be changed according to the mode of the air conditioner 1 to be tested. When the air conditioner 1 to be tested is in the cooling mode, the opening of the top air duct 6 faces the test room. When the air conditioner 1 to be tested is in the heating mode, the opening of the top air duct 6 faces the outside of the test room. This prevents the temperature of the test room from overheating, thereby preventing the normal operation of the air conditioner 1 to be tested from being affected. The test data of the air conditioner 1 to be tested is made more accurate. The voltage and current acquisition system and the temperature regulation and temperature acquisition system are used to automatically adjust the test process and collect information, which greatly improves the degree of automation of the entire test process and greatly improves the efficiency of the test bench for the electrical performance test of the air conditioner. The mechanism is streamlined and efficient, the test operation is convenient, and it has a large application prospect.

[0031] Reference Figure 3 As shown, the test bench also includes test system software, which is installed in a computer. The computer also includes a display for displaying control and detection data of the air conditioner 1 to be tested during the test process, test transcripts and other information. The test system software includes a test implementation module, a hardware correction module, a data management module, and a user login module. The test implementation module is used to control the PLC control system to perform electrical tests on the air conditioner 1 to be tested. The hardware correction module is used to calibrate the comprehensive electricity meter, clamp-on current transformer, ambient temperature sensor, air outlet temperature sensor, and return air temperature sensor before the test. The data management module is used to collect, process and store current, voltage and temperature data of the air conditioner 1 to be tested during the test. The user login module is used to identify the identity of the logged-in user.

[0032] Among them, it should be noted that the user login module contains three levels of user identities, and each has a password, namely administrator, engineer, and operator. The administrator has the highest authority and can modify all content, which is mainly used for debugging the test bench. The engineer has the process parameter setting and test operation authority of the test bench and can modify the process parameters, but cannot modify the parameters set by the test bench during debugging. The operator has the operation authority of the test bench and must operate according to the set process parameters. The data management module includes a database for storing the original data of the test. The database includes a confidentiality algorithm to prevent the original data of the test from being tampered with.

[0033] The encryption algorithm includes the following steps. In the first step, when the user logs in to the test system software as an administrator and accesses the database, the database will automatically generate a string of random numbers, namely ABCDEFG, and automatically send another string of random numbers abcdefg to another user with administrator status. In the second step, the user learns abcdefg from another user and inputs it into the encryption algorithm. It is also necessary to obtain the key OoOOOoo from a third user with administrator status. The key is "O", which represents the value taken from the first group of random numbers, and "o", which represents the value taken from the second group of random numbers. The third user will obtain a new key composed of "O" and "o" after each key is used. In the third step, the user inputs the key obtained from the third user into the encryption algorithm. After calculation, the database access password AbCDEfg can be obtained, and the user can access the database. At the same time, the access password will be sent to the other two users mentioned above.

[0034] Example 2

[0035] The encryption algorithm includes the following steps. In the first step, when the user logs in to the test system software as an administrator and accesses the database, the database will automatically generate a string of random numbers, which are 2536458, and automatically send another string of random numbers 1245125 to another user with administrator status. In the second step, the user learns 1245125 from another user and enters it into the encryption algorithm. It is also necessary to obtain the key OoOOOoo from a third user with administrator status. The key is "O", which represents the value taken from the first group of random numbers, and "o", which represents the value taken from the second group of random numbers. The third user will obtain a new key composed of "O" and "o" after each key is used. In the third step, the user enters the key obtained from the third user into the encryption algorithm. After calculation, the database access password 2236425 can be obtained, and the user can access the database. At the same time, the access password will be sent to the other two users mentioned above.

[0036] It should be noted that when the third user who has the secret key accesses the database unit, the secret key is automatically invalidated, and the encryption algorithm will automatically and randomly generate a new string of secret keys and send it to the first user or the second user. At this time, the steps for the third user to access the data are the same as the above steps.

[0037] Through the setting of encryption algorithm, when accessing the database, close cooperation of three users with administrator status is required. By listing the company, customer, and third party using this test bench as these three users and supervising each other, the database is prevented from being easily accessed and tampered with. Each update of the key will not only leave a trace, which is convenient for later verification, but also ensure that the encryption level of the database will not be reduced due to the publication of the key. The security of the database in this test bench has been significantly improved, thereby greatly improving the credibility of the test reports obtained from the database and the reference value. The algorithm is cleverly designed, the key is concise and easy to remember, and it has a high application prospect.

[0038] The test method of the test bench includes the following steps. The first step is to transport the air conditioner 1 to be tested to the test room, install and fix the return air outlet test fixture 2 at the return air outlet of the air conditioner 1 to be tested by bolts, and then lift the air outlet test fixture 3, the soft connection air duct 5 will be compressed, and the lower outlet of the air outlet test fixture 3 is aligned with the air outlet to complete the placement of the air conditioner 1 to be tested. The second step is to control the setting of the cooling mode or heating mode of the air conditioner 1 to be tested through the air conditioner display setter. The third step is that the power supply system in the control room will supply power to the air conditioner 1 to be tested. The fourth step is to start the air conditioner 1 to be tested, and the voltage, current acquisition system and temperature adjustment and temperature acquisition system are started. The fifth step is that the data management module will continuously collect the current, voltage and temperature data of the air conditioner 1 to be tested during the test, and process it into a test report, which can be output through a printer, and finally stored in a database and encrypted by an encryption algorithm.

[0039] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An electrical performance test bench for a motor vehicle air conditioning unit, characterized in that: The invention comprises a test room and a control room, wherein the test room is used to place an air conditioner to be tested (1) for testing, and the control room is used to control the testing process of the air conditioner to be tested (1). The control room is provided with a control console and an air conditioner display setting device, wherein the control console comprises an industrial computer, a computer, and a printer, wherein the industrial computer comprises a PLC control system, wherein the PLC control system comprises a voltage and current acquisition system and a temperature adjustment and temperature acquisition system, and wherein the air conditioner display setting device is connected to the air conditioner to be tested (1) placed in the test room and is used to set various control modes of the air conditioner to be tested (1); The computer also includes a test system software, which is installed in a computer. The computer also includes a display for displaying information such as control and detection data of the air conditioner (1) under test during the test process, a test report sheet, etc. The test system software includes a test implementation module, a hardware calibration module, a data management module, and a user login module. The test implementation module is used to control the PLC control system to perform an electrical test on the air conditioner (1) under test. The hardware calibration module is used to perform pre-test calibration on the integrated electricity meter, the clamp current transformer, the ambient temperature sensor, the air outlet temperature sensor, and the return air temperature sensor. The data management module is used to collect, process and store the current, voltage and temperature data of the air conditioner (1) under test during the test process. The user login module is used to identify the identity of the logged-in user. The user login module includes three levels of user identities, each with a password, namely, administrator, engineer, and operator. The administrator has the highest authority and can modify all contents, which is mainly used for debugging the test bench. The engineer has the authority to set the process parameters and test operations of the test bench and can modify the process parameters, but cannot modify the parameters set during debugging of the test bench. The operator has the operation authority of the test bench and must operate according to the set process parameters. The data management module includes a database for storing the original data of the test. The database includes an encryption algorithm to prevent the original data of the test from being tampered with; The encryption algorithm comprises the following steps: S1: When a user logs in to the test system software as an administrator and accesses the database, the database will automatically generate a string of random numbers, ABCDEFG, and automatically send another string of random numbers abcdefg to another user with administrator status; S2: After learning abcdefg from another user, the user inputs it into the encryption algorithm. The user also needs to obtain the key OoOOOoo from a third user with administrator status. The key is "O" representing a value from the first set of random numbers, and "o" representing a value from the second set of random numbers. The third user will obtain a new key consisting of "O" and "o" after each key is used. S3: The user inputs the key obtained from the third user into the encryption algorithm, and after calculation, the database access password AbCDEfg can be obtained. The user can then access the database. At the same time, the access password will be sent to the other two users mentioned above.

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