Test auxiliary device

Abstract

The invention provides a test auxiliary device. The test auxiliary device comprises a control unit and a mode switching unit, the mode switching unit is connected with the control unit, the operation mode switching of the mode switching unit is controlled by the control unit, and the operation mode of the mode switching unit comprises at least one of a forward mode, a reverse mode, an open circuit mode and a positive and negative electrode short circuit mode. The programmable power supply can be assisted to complete the functions such as polarity inversion and fault injection in the process of executing automatic testing, and the problems that the power supply polarity inversion function of most programmable power supply manufacturers in the market needs to be specially customized as a selective function, and the programmable power supply cannot support fault function testing such as open circuit and short circuit are solved.

Description

Technical Field

[0001] The present invention relates to the field of testing technology, and in particular to a testing auxiliary device. Background Art

[0002] With the continuous development and progress of new energy technology, new energy vehicles are becoming increasingly popular in daily life. Compared with traditional internal combustion engine vehicles, new energy electric vehicles have the advantages of zero emissions, high energy conversion efficiency, and low operating costs. Among them, the vehicle drive system of new energy electric vehicles is a key system component of the powertrain of new energy electric vehicles. Its performance parameters, control accuracy and reliability directly affect the power, economy and comfort of the whole vehicle.

[0003] Before new energy electric vehicles are put into use, it is necessary to use a programmable power supply to realize automatic tests such as power polarity reversal and fault injection. The inventor has found that the power polarity reversal function of most programmable power supply manufacturers on the market is an optional function that needs to be specially customized, and the programmable power supply cannot support the testing of fault functions such as open circuit and short circuit. Summary of the invention

[0004] In this regard, the present application provides a test auxiliary device that can assist the programmable power supply to complete polarity reversal functions and fault injection during the execution of automated testing, thereby solving the problem that the power polarity reversal function of most programmable power supply manufacturers on the market is an optional function that needs to be specially customized, and the programmable power supply cannot support open circuit, short circuit and other fault function tests.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] The present application discloses a test auxiliary device, comprising: a control unit and a mode switching unit;

[0007] The mode switching unit is connected to the control unit, and the operation mode switching of the mode switching unit is controlled by the control unit. The operation mode of the mode switching unit includes: at least one of a forward mode, a reverse mode, an open circuit mode and a positive and negative short circuit mode.

[0008] Optionally, in the above-mentioned test auxiliary device, the control unit includes: a communication unit and a power supply unit;

[0009] The power supply unit is used to provide electrical energy to the communication unit;

[0010] The communication unit is used to receive a control message sent by a host computer, and control the mode switching unit to switch to a corresponding operation mode according to the control message.

[0011] Optionally, in the above-mentioned test auxiliary device, the communication unit adopts CAN communication.

[0012] Optionally, in the above-mentioned test auxiliary device, the mode switching unit includes: a first control switch, a second control switch, a third control switch, a fourth control switch and a fifth control switch;

[0013] The fixed end of the first control switch serves as the positive input end of the mode switching unit, the first movable end of the first control switch is connected to the first end of the third control switch, and the second movable end of the first control switch is connected to the first end of the fourth control switch;

[0014] The fixed end of the second control switch serves as the negative input end of the mode switching unit, the first movable end of the second control switch is connected to the first end of the third control switch, and the second movable end of the second control switch is connected to the first end of the fourth control switch;

[0015] The second end of the third control switch is connected to the first end of the fifth control switch, and the connection point serves as the positive output terminal of the mode switching unit;

[0016] The second end of the fourth control switch is connected to the second end of the fifth control switch, and the connection point serves as the negative output terminal of the mode switching unit.

[0017] Optionally, in the above-mentioned test auxiliary device, if the operation mode of the mode switching unit is the forward mode, the connection path between the first control switch and the third control switch is turned on, the connection path between the second control switch and the fourth control switch is turned on, the connection path between the third control switch and the fifth control switch is turned on, the connection path between the fourth control switch and the fifth control switch is turned on, the connection path between the first control switch and the fourth control switch is disconnected, and the connection path between the second control switch and the third control switch is disconnected.

[0018] Optionally, in the above-mentioned test auxiliary device, if the operation mode of the mode switching unit is the reverse mode, the connection path between the first control switch and the fourth control switch is turned on, the connection path between the second control switch and the third control switch is turned on, the connection path between the first control switch and the third control switch is turned off, the connection path between the second control switch and the fourth control switch is turned off, the connection path between the third control switch and the fifth control switch is turned off, and the connection path between the fourth control switch and the fifth control switch is turned off.

[0019] Optionally, in the above-mentioned test auxiliary device, if the operation mode of the mode switching unit is the open circuit mode, the connection path between the first control switch and the third control switch is turned on, the connection path between the second control switch and the fourth control switch is turned on, the connection path between the first control switch and the fourth control switch is turned off, the connection path between the second control switch and the third control switch is turned off, the connection path between the third control switch and the fifth control switch is turned off, and the connection path between the fourth control switch and the fifth control switch is turned off.

[0020] Optionally, in the above-mentioned test auxiliary device, if the operation mode of the mode switching unit is the positive and negative short-circuit mode, the connection path between the first control switch and the third control switch is turned on, the connection path between the second control switch and the fourth control switch is turned on, the connection path between the third control switch and the fifth control switch is turned on, the connection path between the fourth control switch and the fifth control switch is turned on, the connection path between the first control switch and the fourth control switch is disconnected, and the connection path between the second control switch and the third control switch is disconnected.

[0021] Optionally, in the above-mentioned test auxiliary device, the first control switch, the second control switch, the third control switch, the fourth control switch and the fifth control switch are all relays.

[0022] Optionally, in the above-mentioned test auxiliary device, the test auxiliary device is connected in series between the power supply and the load during the test process.

[0023] The present invention provides a test auxiliary device, comprising: a control unit and a mode switching unit; the mode switching unit is connected to the control unit, the operation mode switching of the mode switching unit is controlled by the control unit, the operation mode of the mode switching unit comprises: at least one of a forward mode, a reverse mode, an open circuit mode and a positive and negative short circuit mode, and can assist a programmable power supply to complete functions such as polarity reversal and fault injection during the execution of an automated test, thereby solving the problem that the power polarity reversal function of most programmable power supply manufacturers on the market is an optional function that needs to be specially customized, and the programmable power supply cannot support open circuit, short circuit and other fault function tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1A schematic diagram of the structure of a test auxiliary device provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of another test auxiliary device provided in an embodiment of the present application;

[0027] Figure 3 A circuit diagram of a test auxiliary device provided in an embodiment of the present application;

[0028] Figure 4 A circuit diagram of a test auxiliary device in a forward mode provided in an embodiment of the present application;

[0029] Figure 5 A circuit diagram of a test auxiliary device in a reverse mode provided in an embodiment of the present application;

[0030] Figure 6 A circuit diagram of a test auxiliary device in an open circuit mode provided in an embodiment of the present application;

[0031] Figure 7 A circuit diagram of a test auxiliary device in a positive and negative short-circuit mode provided in an embodiment of the present application;

[0032] Figure 8 An application schematic diagram of a test auxiliary device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] 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.

[0034] The embodiment of the present application provides a test auxiliary device that can assist the programmable power supply to complete polarity reversal functions and fault injection during the execution of automated testing, thereby solving the problem that the power polarity reversal function of most programmable power supply manufacturers on the market is an optional function that needs to be specially customized, and the programmable power supply cannot support open circuit, short circuit and other fault function tests.

[0035] See also Figure 1 , the test auxiliary device mainly includes: a control unit 101 and a mode switching unit 102;

[0036] The mode switching unit 102 is connected to the control unit 101 . The operation mode switching of the mode switching unit 102 is controlled by the control unit 101 . The operation modes of the mode switching unit 102 include: at least one of a forward mode, a reverse mode, an open circuit mode and a positive and negative short circuit mode.

[0037] In some embodiments, Figure 2 As shown, the control unit 101 mainly includes: a communication unit 1012 and a power supply unit 1011;

[0038] The power supply unit 1011 is used to provide power to the communication unit 1012;

[0039] The communication unit 1012 is used to receive the control message sent by the host computer, and control the mode switching unit 102 to switch to the corresponding operation mode according to the control message.

[0040] In practical applications, the communication unit 1012 can use CAN communication to communicate with the host computer; of course, it is not limited to this, and can also be determined according to the application environment and user needs. This application does not limit it and it is within the protection scope of this application.

[0041] The power supply unit 1011 can be connected to a mains power supply, converting 220V mains power into a voltage required by the communication unit 1012, and supplying power to the communication unit 1012. Exemplarily, the power supply voltage output by the power supply unit 1011 can be 12V; of course, it is not limited to this, and can also be determined according to the application environment and user needs. This application does not limit this, and all are within the protection scope of this application.

[0042] It should be noted that the control unit 101 can receive the CAN control message sent by the host computer through the communication unit 1012, control the actions of each control switch in the mode switching unit 102, and realize the switching of each operating mode. It can be understood that the actions of each control switch in the mode switching unit 102 can be controlled by the CAN message.

[0043] In some embodiments, Figure 3 As shown, the mode switching unit 102 may include: a first control switch S1, a second control switch S2, a third control switch S3, a fourth control switch S4 and a fifth control switch S5;

[0044] The fixed end of the first control switch S1 serves as the positive input terminal of the mode switching unit 102, the first movable end of the first control switch S1 is connected to the first end of the third control switch S3, and the second movable end of the first control switch S1 is connected to the first end of the fourth control switch S4;

[0045] The fixed end of the second control switch S2 serves as the negative input terminal of the mode switching unit 102, the first movable end of the second control switch S2 is connected to the first end of the third control switch S3, and the second movable end of the second control switch S2 is connected to the first end of the fourth control switch S4;

[0046] The second end of the third control switch S3 is connected to the first end of the fifth control switch S5, and the connection point serves as the positive output terminal of the mode switching unit 102;

[0047] The second end of the fourth control switch S4 is connected to the second end of the fifth control switch S5 , and the connection point serves as the negative electrode of the output terminal of the mode switching unit 102 .

[0048] In practical applications, the first control switch S1, the second control switch S2, the third control switch S3, the fourth control switch S4 and the fifth control switch S5 can all be relays; wherein, the first control switch S1 and the second control switch S2 can also be single-pole double-throw switches, and the third control switch S3, the fourth control switch S4 and the fifth control switch S5 can be single-pole single-throw switches; of course, it is not limited to this, and can also be determined according to the application environment and user needs. This application does not make specific limitations, and all are within the protection scope of this application.

[0049] In actual applications, since the operating modes of the mode switching unit 102 include at least one of: forward mode, reverse mode, open circuit mode and positive and negative pole short circuit mode, and the switching of each operating mode in the mode switching unit 102 is mainly achieved by controlling the actions of each switch in the mode switching unit 102, in actual applications, when the mode switching unit 102 is in different operating modes, the on-off states of each switch are different.

[0050] by Figure 3 Taking the mode switching unit 102 as an example, when the operation mode of the mode switching unit 102 is the forward mode, the connection path between the first control switch S1 and the third control switch S3 is turned on, the connection path between the second control switch S2 and the fourth control switch S4 is turned on, the connection path between the third control switch S3 and the fifth control switch S5 is turned on, the connection path between the fourth control switch S4 and the fifth control switch S5 is turned on, the connection path between the first control switch S1 and the fourth control switch S4 is disconnected, and the connection path between the second control switch S2 and the third control switch S3 is disconnected, that is, Figure 4 shown.

[0051] It should be noted that when the operation mode of the mode switching unit 102 is the forward mode, the voltage between the power supply and the load can be adjusted to a forward voltage and the current between the power supply and the load can be adjusted to a forward current through the test auxiliary device.

[0052] by Figure 3Taking the mode switching unit 102 as an example, when the operation mode of the mode switching unit 102 is the reverse mode, the connection path between the first control switch S1 and the fourth control switch S4 is turned on, the connection path between the second control switch S2 and the third control switch S3 is turned on, the connection path between the first control switch S1 and the third control switch S3 is turned off, the connection path between the second control switch S2 and the fourth control switch S4 is turned off, the connection path between the third control switch S3 and the fifth control switch S5 is turned off, and the connection path between the fourth control switch S4 and the fifth control switch S5 is turned off, that is, Figure 5 shown.

[0053] It should be noted that when the operation mode of the mode switching unit 102 is the reverse mode, the voltage between the power supply and the load can be adjusted to a reverse voltage and the current between the power supply and the load can be adjusted to a reverse current through the test auxiliary device.

[0054] by Figure 3 Taking the mode switching unit 102 as an example, when the operation mode of the mode switching unit 102 is the open circuit mode, the connection path between the first control switch S1 and the third control switch S3 is turned on, the connection path between the second control switch S2 and the fourth control switch S4 is turned on, the connection path between the first control switch S1 and the fourth control switch S4 is turned off, the connection path between the second control switch S2 and the third control switch S3 is turned off, the connection path between the third control switch S3 and the fifth control switch S5 is turned off, and the connection path between the fourth control switch S4 and the fifth control switch S5 is turned off, that is, Figure 6 shown.

[0055] It should be noted that when the operation mode of the mode switching unit 102 is the open circuit mode, the connection between the power supply and the load can be disconnected by the test auxiliary device to create an open circuit fault.

[0056] by Figure 3 Taking the mode switching unit 102 as an example, when the operation mode of the mode switching unit 102 is the positive and negative short-circuit mode, the connection path between the first control switch S1 and the third control switch S3 is turned on, the connection path between the second control switch S2 and the fourth control switch S4 is turned on, the connection path between the third control switch S3 and the fifth control switch S5 is turned on, the connection path between the fourth control switch S4 and the fifth control switch S5 is turned on, the connection path between the first control switch S1 and the fourth control switch S4 is disconnected, and the connection path between the second control switch S2 and the third control switch S3 is disconnected, that is, Figure 7 shown.

[0057] It should be noted that when the operation mode of the mode switching unit 102 is the positive-negative short-circuit mode, the positive-negative short-circuit fault can be created by short-circuiting the positive-negative poles between the power supply and the load through the test auxiliary device.

[0058] It should also be noted that during the test process, the test auxiliary device is generally connected in series between the power supply and the load. It can be understood that the input end of the mode switching unit 102 can be connected to the programmable power supply as the input end of the test auxiliary device; the output end of the mode switching unit 102 can be connected to the load as the output end of the test auxiliary device.

[0059] In actual applications, in addition to controlling the mode switching unit 102 to switch, the control unit 101 can also collect the status of each control switch in the mode switching unit 102 and feed back the collected data to the upper computer so that relevant personnel can know the operation status of the mode switching unit 102 and improve the operation reliability of the test auxiliary unit.

[0060] Taking the communication unit 1012 as a CAN communication unit and the power supply voltage output by the power supply unit 1011 as 12V as an example, the schematic diagram of the test auxiliary device provided in this embodiment is as follows: Figure 8 As shown, each control switch (S1 to S5 in the figure) in the mode switching unit 102 in the test auxiliary device is controlled by the CAN communication unit. The CAN communication unit controls the corresponding control switch on and off according to the received CAN message signal, thereby realizing the mode switching unit 102 entering different operating modes.

[0061] Based on the above principles, the test auxiliary device provided in this embodiment includes: a control unit 101 and a mode switching unit 102; the mode switching unit 102 is connected to the control unit 101, and the operation mode switching of the mode switching unit 102 is controlled by the control unit 101. The operation modes of the mode switching unit 102 include: at least one of a forward mode, a reverse mode, an open circuit mode and a positive and negative short circuit mode, which can assist the programmable power supply to complete polarity reversal function and fault injection function during the execution of automated testing, thereby solving the problem that the power polarity reversal function of most programmable power supply manufacturers on the market is an optional function that needs to be specially customized, and the programmable power supply cannot support open circuit, short circuit and other fault function tests.

[0062] It is worth noting that, in the tests before new energy electric vehicles are put into use, the fault injection test of the power supply is mainly carried out manually, such as manual short circuit and manual reverse connection. This method cannot guarantee the safety of the operator and cannot perform fast automated testing. However, by using the test auxiliary device provided in the embodiment of the present application, the operating modes required for various fault injection tests can be realized through the test auxiliary device, meeting the automated testing requirements such as open circuit, short circuit and polarity reversal of the power supply output voltage and output current.

[0063] It should be noted that the above-mentioned test auxiliary device can be applied not only to new energy electric vehicle testing scenarios, but also to energy storage-related scenarios, such as energy storage BMS testing. This application does not limit the application scenarios of the test auxiliary device, which are all within the protection scope of this application.

[0064] It should also be noted that for relevant descriptions of new energy electric vehicles and energy storage BMS, please refer to the prior art, and this application will not go into details.

[0065] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work. Professionals can also further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented in electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0066] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0067] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A test auxiliary device, characterized in that: include: A control unit and a mode switching unit; The mode switching unit is connected to the control unit, and the operation mode switching of the mode switching unit is controlled by the control unit. The operation mode of the mode switching unit includes: at least one of a forward mode, a reverse mode, an open circuit mode and a positive and negative short circuit mode.

2. The test auxiliary device according to claim 1, characterized in that: The control unit includes: a communication unit and a power supply unit; The power supply unit is used to provide electrical energy to the communication unit; The communication unit is used to receive a control message sent by a host computer, and control the mode switching unit to switch to a corresponding operation mode according to the control message.

3. The test auxiliary device according to claim 2, characterized in that: The communication unit adopts CAN communication.

4. The test auxiliary device according to claim 1, characterized in that: The mode switching unit includes: a first control switch, a second control switch, a third control switch, a fourth control switch and a fifth control switch; The fixed end of the first control switch serves as the positive input end of the mode switching unit, the first movable end of the first control switch is connected to the first end of the third control switch, and the second movable end of the first control switch is connected to the first end of the fourth control switch; The fixed end of the second control switch serves as the negative input end of the mode switching unit, the first movable end of the second control switch is connected to the first end of the third control switch, and the second movable end of the second control switch is connected to the first end of the fourth control switch; The second end of the third control switch is connected to the first end of the fifth control switch, and the connection point serves as the positive output terminal of the mode switching unit; The second end of the fourth control switch is connected to the second end of the fifth control switch, and the connection point serves as the negative output terminal of the mode switching unit.

5. The test auxiliary device according to claim 4, characterized in that: If the operation mode of the mode switching unit is the forward mode, the connection path between the first control switch and the third control switch is turned on, the connection path between the second control switch and the fourth control switch is turned on, the connection path between the third control switch and the fifth control switch is turned on, the connection path between the fourth control switch and the fifth control switch is turned on, the connection path between the first control switch and the fourth control switch is turned off, and the connection path between the second control switch and the third control switch is turned off.

6. The test auxiliary device according to claim 4, characterized in that: If the operation mode of the mode switching unit is the reverse mode, the connection path between the first control switch and the fourth control switch is turned on, the connection path between the second control switch and the third control switch is turned on, the connection path between the first control switch and the third control switch is turned off, the connection path between the second control switch and the fourth control switch is turned off, the connection path between the third control switch and the fifth control switch is turned off, and the connection path between the fourth control switch and the fifth control switch is turned off.

7. The test auxiliary device according to claim 4, characterized in that: If the operation mode of the mode switching unit is the open circuit mode, the connection path between the first control switch and the third control switch is turned on, the connection path between the second control switch and the fourth control switch is turned on, the connection path between the first control switch and the fourth control switch is turned off, the connection path between the second control switch and the third control switch is turned off, the connection path between the third control switch and the fifth control switch is turned off, and the connection path between the fourth control switch and the fifth control switch is turned off.

8. The test auxiliary device according to claim 4, characterized in that: If the operation mode of the mode switching unit is the positive and negative short-circuit mode, the connection path between the first control switch and the third control switch is turned on, the connection path between the second control switch and the fourth control switch is turned on, the connection path between the third control switch and the fifth control switch is turned on, the connection path between the fourth control switch and the fifth control switch is turned on, the connection path between the first control switch and the fourth control switch is turned off, and the connection path between the second control switch and the third control switch is turned off.

9. The test assisting device according to claim 4, characterized in that: The first control switch, the second control switch, the third control switch, the fourth control switch and the fifth control switch are all relays.

10. The test auxiliary device according to any one of claims 1 to 9, characterized in that: During the test process, the test auxiliary device is connected in series between the power supply and the load.

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