A method and system for production testing of vehicle-mounted intelligent terminal

Abstract

The present invention discloses a method and system for production testing of an on-board intelligent terminal, the system comprising: a test fixture receives a test signal from an external antenna through a first terminal of an antenna interface of the intelligent terminal, and sends the test signal to a power divider; the power divider divides the test signal received from the test fixture into two paths, a first test signal and a second test signal, and sends them respectively; a spectrum analyzer receives the first test signal from the power divider, and detects a first signal strength of the first test signal; a test processor reads the first signal strength detected by the spectrum analyzer, and the second signal strength of the second test signal received by the wireless communication module through the second terminal of the antenna interface. The present invention verifies the wireless communication module and the antenna separately, not only can the abnormal position be quickly confirmed when the communication performance is abnormal, but also the test reliability of the wireless communication module is improved by introducing the reference value read by the spectrum analyzer and the preset tolerable error.

Description

Technical Field

[0001] The present invention relates to the field of vehicle-mounted intelligent terminals, and mainly to a method and system for production testing of a vehicle-mounted intelligent terminal. Background Art

[0002] With the rise of the Internet of Vehicles market, more and more in-vehicle smart terminals are used in the Internet of Vehicles. The wireless communication transmission device of the in-vehicle smart terminal generally includes three parts: a wireless communication module, an antenna interface and an antenna. The above three parts will be welded or mounted on a PCB. Due to the complex electromagnetic environment in the car and the metal structure of the car body itself, the wireless transmission performance of the in-vehicle smart terminal will be affected by many uncertainties. At present, most in-vehicle smart terminals use external antennas.

[0003] At present, most of the wireless communication modules in vehicle-mounted smart terminals use mature patch modules. After patching them to the PCB board of the smart terminal, their wireless performance will change. Therefore, in order to ensure the wireless transmission performance of the vehicle-mounted smart terminal, it is necessary to conduct production testing on the vehicle-mounted smart terminal. The existing production test scheme for the wireless performance of vehicle-mounted smart terminals is mainly to use communication test instruments to send fixed-strength signals after assembling external antennas, or to use software commands to read the strength of received signals under the signal coverage of existing operator base stations, and to judge whether the wireless performance of the vehicle-mounted smart terminal is normal by the received signal strength.

[0004] The above-mentioned existing production test scheme verifies whether the wireless performance is normal through the wireless communication signal strength of the assembled whole machine. Since the strength of the received signal may be affected by factors such as the environment, antenna, antenna direction and antenna interface assembly, the determination of whether the strength of the received signal is within the normal range will be relatively broad. Even if any part of the antenna, antenna interface and wireless communication module has a defect within the error range, the existing production test scheme cannot detect it, resulting in risks to the wireless performance of the entire smart terminal and reducing the reliability of production testing. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing production test scheme has a relatively wide error range when determining whether the strength of the received signal is normally determined, and it is impossible to detect which part of the antenna, antenna interface and wireless communication module has a defect within the error range, which leads to risks in the wireless performance of the entire smart terminal and reduces the reliability of production testing.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is to provide a system for production testing of an in-vehicle intelligent terminal, including:

[0007] A test fixture, used to receive a test signal from an external antenna through a first terminal of an antenna interface of a smart terminal, and send the test signal to a power divider;

[0008] A power divider, used for equally dividing the test signal received from the test fixture into two paths, a first test signal and a second test signal, and sending them separately;

[0009] A spectrum analyzer, used for receiving the first test signal from the power divider and detecting a first signal strength of the first test signal;

[0010] The test processor is used to read the first signal strength detected by the spectrum analyzer and the second signal strength of the second test signal received by the wireless communication module through the second terminal of the antenna interface.

[0011] In the above system, the test processor further includes:

[0012] The first signal strength and the second signal strength are subtracted to obtain a first difference. If the absolute value of the first difference is less than or equal to a preset tolerance error, the wireless communication module is determined to be normal. If the absolute value of the first difference is greater than the tolerance error, the wireless communication module is determined to be abnormal.

[0013] In the above system, the test processor reads the first signal strength detected by the spectrum analyzer through a SCPI command.

[0014] In the above system, the test processor is connected to the wireless communication module of the intelligent terminal to be tested through a serial port.

[0015] In the above system, the test fixture includes a radio frequency terminal; the radio frequency terminal includes a first interface and a second interface matching the first terminal and the second terminal; wherein the first terminal and the second terminal can be respectively inserted into the first interface and the second interface to achieve a detachable connection between the antenna and the wireless communication module.

[0016] In the above system, the test fixture also includes a mounting slot for mounting a smart terminal; the RF terminal and the power divider are arranged on the mounting slot, and a third interface for connecting the power divider with the spectrum analyzer is arranged on the mounting slot.

[0017] In the above system, the installation slot is also provided with a plug and a power switch matching the power interface of the intelligent terminal;

[0018] After the intelligent terminal is installed in the installation slot, the power interface is connected to the plug, and the power on and off of the intelligent terminal are controlled by closing and opening the power switch.

[0019] In the above system, the installation slot is also provided with a first serial port for connecting the wireless communication module and the test processor; after the smart terminal is installed in the installation slot, the wireless communication module and the test processor are connected through the first serial port.

[0020] The present invention also provides a method for production testing of a vehicle-mounted intelligent terminal, comprising:

[0021] Wireless communication module test:

[0022] Splitting the test signal from the antenna into a first test signal and a second test signal at the first terminal of the antenna interface, and sending the second test signal to the wireless communication module through the second terminal of the antenna interface;

[0023] Detecting a first signal strength of a first test signal using a spectrum analyzer;

[0024] Reading a second signal strength of a second test signal received by the wireless communication module and a first signal strength detected by the spectrum analyzer;

[0025] Compare the first signal strength and the second signal strength, if the absolute value of the difference between the two is less than or equal to the tolerance error, the wireless communication module is normal, if it is greater than the tolerance error, the wireless communication module is abnormal;

[0026] External antenna test:

[0027] When the wireless communication module is normal during the wireless communication module test, the antenna is replaced with a standard antenna, wherein the standard antenna is an antenna tested to be normal in an environment that meets the test requirements;

[0028] Reading a first signal strength of the spectrum analyzer and recording it as a first value;

[0029] Replace the standard antenna with the antenna to be tested and read the first signal strength of the spectrum analyzer;

[0030] The first signal strength is compared with the first value. If the difference between the first signal strength and the first value is less than or equal to the tolerance error of the antenna, the antenna to be tested is normal; otherwise, it is abnormal.

[0031] In the above method, the first terminal of the antenna interface and the second terminal of the antenna interface are connected by a test fixture during testing;

[0032] The test fixture receives a test signal from an external antenna through a first terminal of an antenna interface of the smart terminal, and sends the test signal to the power divider;

[0033] The power divider equally divides the test signal into two paths, a first test signal and a second test signal, and sends them to the spectrum analyzer and the wireless communication module of the smart terminal respectively.

[0034] The present invention divides the whole machine test of the smart terminal into two parts at the antenna interface, and verifies the wireless communication module and the antenna separately. When the communication performance is abnormal, the abnormal location can be quickly confirmed; and when the wireless communication module is tested, the reference value read by the spectrum analyzer and the introduction of the preset tolerable error can greatly reduce the error range of the signal strength received by the wireless communication module, thereby improving the test reliability of the wireless communication module; on the other hand, when testing the external antenna, the antenna performance test is achieved through a standard antenna when the test system remains unchanged, which is not only suitable for batch testing of antennas, but also can still achieve high accuracy in the production line working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A structural block diagram of a system for production and testing of an in-vehicle intelligent terminal provided by an embodiment of the present invention;

[0036] Figure 2 A flowchart of a wireless communication module test in an embodiment of the present invention;

[0037] Figure 3 The figure is a flow chart of an external antenna test in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention discloses a method and system for production and testing of a vehicle-mounted intelligent terminal. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve it. It should be particularly pointed out that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention, and relevant personnel can obviously modify or appropriately change and combine the contents described in this article without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0039] In the present invention, unless otherwise specified, the scientific and technical terms used herein have the meanings commonly understood by those skilled in the art.

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific embodiments.

[0041] like Figure 1 As shown, an embodiment of the present invention provides a system for production testing of an in-vehicle intelligent terminal, including a test fixture 10 , a power divider 20 , a spectrum analyzer 30 and a test processor 40 .

[0042] The test fixture 10 receives a test signal from an external antenna 50 through the first terminal of the antenna interface of the smart terminal, and sends the test signal to the power divider 20; wherein the test signal is a fixed strength signal emitted by a communication test instrument or a signal emitted by an operator base station.

[0043] The power divider 20 divides the test signal received from the test fixture into two paths: a first test signal and a second test signal, and sends them to the spectrum analyzer 30 and the wireless communication module 60 of the smart terminal respectively. The wireless communication module 60 receives the second test signal through the second terminal of the antenna interface.

[0044] The spectrum analyzer 30 detects a first signal strength of the first test signal.

[0045] The test processor 40 is connected to the wireless communication module 60 of the intelligent terminal to be tested through the serial port; the second signal strength received by the wireless communication module 60 and the first signal strength detected by the spectrum analyzer 30 are read respectively, and the first signal strength is subtracted from the second signal strength to obtain a first difference. If the absolute value of the first difference is less than or equal to the tolerance error (determined according to the accuracy requirement), the wireless communication module 60 is normal; if the absolute value of the first difference is greater than the tolerance error, the wireless communication module is abnormal. The normal wireless communication module 60 is used to detect the first signal strength of the standard antenna through the spectrum analyzer 30, and then the standard antenna is replaced with the antenna to be tested. The first signal strength of the antenna to be tested is detected through the spectrum analyzer 30. If it is consistent with the first signal strength of the standard antenna (the difference between the two is less than or equal to the tolerance error of the antenna), the antenna to be tested is normal, otherwise it is abnormal. In this embodiment, the test processor 40 reads the first signal strength detected by the spectrum analyzer 30 through the SCPI command.

[0046] The embodiment of the present invention divides the whole machine test into two parts at the antenna interface for testing, and verifies the wireless communication module and the antenna separately, so that when the communication performance is abnormal, the abnormal position can be quickly confirmed; in the first part, the test signal received by the antenna is evenly divided into two paths at the antenna interface, and the first signal strength of one path is measured by a spectrum analyzer, and the first signal strength is used as a reference value for the normal wireless communication module receiving signal strength, and the other test signal is sent to the wireless communication module. At this time, the main reason for the difference between the wireless communication module receiving signal strength and the first signal strength comes from the wireless communication module, the first terminal of the antenna interface, and the radio frequency circuit (electrical The circuit generally includes RC devices and RF routing). When the absolute value of the difference between the received signal strength of the wireless communication module and the first signal strength is less than or equal to the tolerable error, it means that the above-mentioned part of the wireless performance is normal. The reference value read by the spectrum analyzer and the introduction of the preset tolerable error will greatly reduce the error range of the received signal strength of the wireless communication module, thereby improving the test reliability of the wireless communication module. In the second part, when the test system remains unchanged, the antenna performance test is realized through a standard antenna. When the antenna to be tested is replaced, if the signal strength value measured by the spectrum analyzer is consistent with that when the standard antenna is installed, the antenna to be tested is normal. It is not only suitable for batch testing of antennas, but also has a high test accuracy.

[0047] Due to the vehicle itself and the road conditions, the vehicle may experience irregular vibrations during driving. Therefore, the antenna interface of the on-board intelligent terminal connecting the external antenna 50 and the wireless communication module 60 needs to consider the stability of its connection. The existing reliable connection between the external antenna 50 and the wireless communication module 60 is often a Fakra interface of automotive grade. The Fakra interface has two terminals with communication functions, the first terminal is fixedly connected to the antenna 50, and the second terminal is fixedly connected to the wireless communication module 60. The first terminal and the second terminal are detachably connected through a snap-on fixing component. Although the snap-on structure of the Fakra interface is highly reliable, the assembly and disassembly of the Fakra interface is time-consuming. Improper force will cause damage to the first terminal and / or the second terminal, thereby causing the antenna 50 and / or the wireless communication module 60 fixedly connected thereto to be scrapped, which not only causes low efficiency in manual disassembly and assembly during production line testing, but also causes waste of resources. In order to solve this problem, in the present embodiment, the test fixture 10 includes an RF terminal, and the RF terminal includes a first interface and a second interface matching the first terminal and the second terminal. The first terminal and the second terminal can be respectively inserted into the first interface and the second interface to achieve a detachable connection. During the testing phase, the Fakra interface is not assembled, and only the first terminal is inserted into the first interface and the second terminal is inserted into the second interface to achieve the connection between the antenna 50 and the wireless communication module 60, thereby avoiding the inefficiency and damage caused by assembling and disassembling the Fakra interface during the production testing phase.

[0048] In the present embodiment, the test fixture 10 also includes a mounting slot for installing the smart terminal, and the RF terminal and the power divider are arranged on the mounting slot. In the present embodiment, the mounting slot is provided with a plug that matches the power interface of the smart terminal, and the mounting slot is provided with a power switch. After the smart terminal is installed in the mounting slot, the power interface is connected to the plug, and the power on and off of the smart terminal are controlled by the power switch, which is convenient for the tester to operate. In other embodiments, in addition to the third interface for connecting the spectrum analyzer 30, the mounting slot is also provided with a first serial port for connecting the wireless communication module 60 and the test processor 40. After the smart terminal is installed in the mounting slot, the wireless communication module 60 and the test processor 40 are connected through the first serial port, thereby reducing the manual workload of the test workers. During batch testing, it is only necessary to replace the smart terminal and the antenna of the smart terminal on the mounting slot to achieve testing, thereby improving production testing efficiency.

[0049] An embodiment of the present invention provides a method for production testing of an on-board intelligent terminal as a whole machine. The method uses a system for production testing of an on-board intelligent terminal as provided in an embodiment of the present invention to implement production testing of the on-board intelligent terminal, including:

[0050] Wireless communication module testing (such as Figure 2 shown):

[0051] Step A100: dividing the test signal from the antenna into two paths, a first test signal and a second test signal, at the first terminal of the antenna interface (through a power divider), and sending the second test signal to the wireless communication module through the second terminal of the antenna interface;

[0052] Step A200, using a spectrum analyzer to detect a first signal strength of a first test signal;

[0053] Step A300, reading the second signal strength of the second test signal received by the wireless communication module and the first signal strength detected by the spectrum analyzer;

[0054] Step A400: Compare the first signal strength and the second signal strength. If the absolute value of the difference between the two is less than or equal to the tolerance error, the wireless communication module is normal; if it is greater than the tolerance error, the wireless communication module is abnormal.

[0055] External antenna test (such as Figure 3 shown):

[0056] Step B100: When the wireless communication module is normal during the wireless communication module test, the antenna is replaced with a standard antenna (an antenna that is tested to be normal in an environment that meets the test requirements);

[0057] Step B200, reading a first signal strength of the spectrum analyzer and recording it as a first value;

[0058] Step B300, after replacing the standard antenna with the antenna to be tested, read the first signal strength of the spectrum analyzer;

[0059] Step B400, compare the first signal strength and the first value. If the difference between the first signal strength and the first value is less than or equal to the tolerance error of the antenna, the antenna to be tested is normal, otherwise, it is abnormal. In this embodiment, the comparison and the test results are obtained by the test processor. In this embodiment, the test processor is a test computer, and the test results can be displayed to the tester through voice or display. Steps B200, B300, and B400 of this embodiment can be implemented by the test processor through a program.

[0060] In step A100 of this embodiment, the first terminal of the antenna interface and the second terminal of the antenna interface are not connected through a fixed component during testing, but are connected through a test fixture. The test fixture receives a test signal from an external antenna through the first terminal of the antenna interface of the smart terminal, and sends the test signal to a power divider; the power divider divides the test signal received from the test fixture into two paths, a first test signal and a second test signal, and sends them to the spectrum analyzer and the wireless communication module of the smart terminal respectively.

[0061] The embodiment of the present invention divides the whole machine test into two parts at the antenna interface for testing, and verifies the wireless communication module and the antenna separately. When the communication performance is abnormal, the abnormal position can be quickly confirmed; and in the wireless communication module test, the test signal received by the antenna is evenly divided into two paths at the antenna interface, and the first signal strength of one path is measured by the spectrum analyzer, and the first signal strength is used as the reference value of the normal wireless communication module receiving signal strength, and the other test signal is sent to the wireless communication module. When the absolute value of the difference between the wireless communication module receiving signal strength and the first signal strength is less than or equal to the tolerable error, it indicates that the wireless performance is normal. The reference value read by the spectrum analyzer and the introduction of the preset tolerable error will greatly reduce the error range of the wireless communication module receiving signal strength, thereby improving the test reliability of the wireless communication module; when testing the external antenna, when the test system remains unchanged, the antenna performance test is implemented through a standard antenna. When the antenna to be tested is replaced, if the signal strength value measured by the spectrum analyzer is consistent with that when the standard antenna is installed, the antenna to be tested is normal. It is not only suitable for antenna batch testing, but also has a high test accuracy.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A system for production testing of vehicle-mounted intelligent terminals, characterized in that: include: A test fixture, used to receive a test signal from an external antenna through a first terminal of an antenna interface of a smart terminal, and send the test signal; A power divider, used for equally dividing the test signal received from the test fixture into two paths, a first test signal and a second test signal, and sending them separately; A spectrum analyzer, used for receiving the first test signal from the power divider and detecting a first signal strength of the first test signal; A test processor, used to read the first signal strength detected by the spectrum analyzer and the second signal strength of the second test signal received by the wireless communication module through the second terminal of the antenna interface; When the wireless communication module is normal during the wireless communication module test, replace the antenna with a standard antenna; Read the first signal strength of the spectrum analyzer and record it as the first value; replace the standard antenna with the antenna to be tested, and read the first signal strength of the spectrum analyzer; compare the first signal strength and the first value, if the difference between the first signal strength and the first value is less than or equal to the tolerance error of the antenna, the antenna to be tested is normal, otherwise, it is abnormal.

2. The system according to claim 1, characterized in that The test processor also includes: The first signal strength and the second signal strength are subtracted to obtain a first difference. If the absolute value of the first difference is less than or equal to a preset tolerance error, the wireless communication module is determined to be normal. If the absolute value of the first difference is greater than the tolerance error, the wireless communication module is determined to be abnormal.

3. The system according to claim 1, characterized in that The test processor reads the first signal strength detected by the spectrum analyzer through a SCPI command.

4. The system according to claim 1, characterized in that The test processor is connected to the wireless communication module of the intelligent terminal to be tested through a serial port.

5. The system according to claim 1, characterized in that The test fixture includes a radio frequency terminal; the radio frequency terminal includes a first interface and a second interface matching the first terminal and the second terminal; wherein the first terminal and the second terminal can be inserted into the first interface and the second interface respectively to achieve a detachable connection between the antenna and the wireless communication module.

6. The system according to claim 5, characterized in that The test fixture also includes a mounting slot for mounting a smart terminal; the radio frequency terminal and the power divider are arranged on the mounting slot, and a third interface for connecting the power divider with the spectrum analyzer is arranged on the mounting slot.

7. The system according to claim 6, characterized in that The installation slot is also provided with a plug and a power switch matching the power interface of the intelligent terminal; After the intelligent terminal is installed in the installation slot, the power interface is connected to the plug, and the power on and off of the intelligent terminal are controlled by closing and opening the power switch.

8. The system according to claim 6, characterized in that The installation slot is also provided with a first serial port for connecting the wireless communication module and the test processor; after the intelligent terminal is installed in the installation slot, the wireless communication module and the test processor are connected through the first serial port.

9. A method for production testing of an in-vehicle intelligent terminal, characterized in that: include: Wireless communication module test: Splitting the test signal from the antenna into a first test signal and a second test signal at the first terminal of the antenna interface, and sending the second test signal to the wireless communication module through the second terminal of the antenna interface; Detecting a first signal strength of a first test signal using a spectrum analyzer; Reading a second signal strength of a second test signal received by the wireless communication module and a first signal strength detected by the spectrum analyzer; Compare the first signal strength and the second signal strength. If the absolute value of the difference between the two is less than or equal to the tolerance error, the wireless communication module is normal; if the absolute value is greater than the tolerance error, the wireless communication module is abnormal. External antenna test: When the wireless communication module is normal during the wireless communication module test, the antenna is replaced with a standard antenna, wherein the standard antenna is an antenna tested to be normal in an environment that meets the test requirements; Reading a first signal strength of the spectrum analyzer and recording it as a first value; Replace the standard antenna with the antenna to be tested and read the first signal strength of the spectrum analyzer; The first value is compared with the first signal strength after the antenna to be tested is replaced. If the difference between the first signal strength after the antenna to be tested and the first value is less than or equal to the tolerance error of the antenna, the antenna to be tested is normal; otherwise, it is abnormal.

10. The method according to claim 9, characterized in that The first terminal of the antenna interface and the second terminal of the antenna interface are connected through a test fixture during testing; The test fixture receives a test signal from an external antenna through a first terminal of an antenna interface of the smart terminal, and sends the test signal to the power divider; The power divider equally divides the test signal into two paths, a first test signal and a second test signal, and sends them to the spectrum analyzer and the wireless communication module of the smart terminal respectively.

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