Vehicle-mounted camera module detection system and detection method

Abstract

The invention discloses a vehicle-mounted camera module detection system and method. The system comprises a constant temperature box used for providing a test environment, a to-be-detected camera module arranged in the constant temperature box, a current monitoring unit, a voltage control unit, a main control unit, an information transmission and storage unit and a display reminding unit, wherein the main control unit, the information transmission and storage unit and the display reminding unit are arranged outside the constant temperature box; the camera module to be tested, the current monitoring unit and the voltage control unit are integrated into a test module, the information transmission and storage unit and the display reminding unit are respectively connected with the main control unit, and the main control unit is connected with the test module through a coaxial line. The length of the coaxial line is larger than or equal to a first length threshold value so that the main control unit and the test module can be physically isolated in the test environment. The camera module to be detected, the voltage control unit and the current monitoring unit are integrated and arranged in the constant temperature box, and the other units are arranged outside the constant temperature box, so that the cost can be reduced, the reliability is ensured, the operation is simplified, and the detection result can be visually displayed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of camera testing, in particular to a vehicle-mounted camera module detection system and a detection method. BACKGROUND

[0002] Nowadays, cameras are widely used in the vehicle-mounted field. Compared with the traditional BGA process, the certified COB (Chip On Board) packaging technology shows significant performance advantages: adopting the outsourcing wafer self-packaging mode, the delivery cycle is shortened by 1 to 2 months compared with the traditional mode relying on the output of the test factory; the packaging precision is improved from the SMT process of 100 microns to the COB process of 10 microns, and the image acquisition is more stable; the chip bonding area is larger, the heat conduction performance is stronger, and the heat dissipation performance is better than the existing scheme; at the same time, the structure realizes the Sensor (image sensor) and PCBA surface contact integrated packaging, which meets the miniaturization trend while taking into account the high integration.

[0003] However, the rapid landing of the COB packaging technology faces severe challenges in vehicle-level certification. Vehicle-level devices need to pass the AEC-Q100 (Electronic Component Reliability Test) device-level certification and DV / PV (Design / Product Verification) module-level reliability test. Among them, Burn In (Burn In) is an important part of the test. The traditional Burn In equipment has problems such as high cost, complex operation, and non-intuitive detection results, which restricts the rapid and large-scale application of COB packaging technology in the vehicle-mounted field. SUMMARY

[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a vehicle-mounted camera module detection system and a detection method which are low in cost and can intuitively display detection results.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a vehicle-mounted camera module detection system, comprising: an incubator for providing a test environment, a to-be-tested camera module arranged in the incubator, a current monitoring unit, a voltage control unit, and a main control unit, an information transmission and storage unit, and a display and reminding unit arranged outside the incubator; the to-be-tested camera module, the current monitoring unit, and the voltage control unit are integrated into a test module, the information transmission and storage unit and the display and reminding unit are respectively connected with the main control unit, the main control unit is connected with the test module through a coaxial line, and the length of the coaxial line is greater than or equal to a first length threshold value to realize physical isolation between the main control unit and the test module in the test environment.

[0006] Further, the master control unit is configured to control the cooperation of the units; the voltage control unit is configured to provide working voltage for the to-be-tested camera module under the control of the master control unit to meet the detection requirements; the current monitoring unit and the image sensor in the to-be-tested camera module are configured to acquire working parameters of the to-be-tested camera module in real time, the working parameters including voltage, current, frame rate and temperature of the to-be-tested camera module; the information transmission and storage unit is configured to transmit and store detection data and log information in real time; and the display and reminding unit is configured to output an alarm signal and remind the operation progress according to the working parameters of the to-be-tested camera module.

[0007] Further, the voltage control unit includes a power management integrated circuit and a low-voltage linear voltage regulator; the power management integrated circuit is configured to receive instructions of the master control unit and generate one or more basic voltages; and the low-voltage linear voltage regulator is configured to stabilize the basic voltages to generate working voltages required by the camera module, the working voltages including AVDD, DOVDD and DVDD.

[0008] The master control unit controls the output voltage values of the power management integrated circuit and the low-voltage linear voltage regulator through a communication protocol to meet the detection requirements of different types of camera modules in different test environments.

[0009] Further, the display and reminding unit includes an indicator light group and an alarm, and the indicator light group is a red-green LED light group, wherein:

[0010] The red-green LED light group is configured to warn the current abnormal detection situation through different light combinations.

[0011] The alarm is configured to alarm when the test is terminated.

[0012] Further, the abnormal detection situations corresponding to different light combinations include:

[0013] All green lights are on and all red lights are off, indicating that the test is passed; all green lights are on and off alternately and all red lights are off, indicating that the test is in progress and there is no abnormality at present; all green lights are off and all red lights are on, indicating that the abnormality of the basic function failure of the vehicle-mounted camera module detection system; the first red light is on and the first green light is off, indicating the DVDD voltage monitoring abnormality; the second red light is on and the second green light is off, indicating the DVDD current monitoring abnormality; the third red light is on and the third green light is off, indicating the DOVDD voltage monitoring abnormality; the fourth red light is on and the fourth green light is off, indicating the DOVDD current monitoring abnormality; the fifth red light is on and the fifth green light is off, indicating the AVDD voltage monitoring abnormality; the sixth red light is on and the sixth green light is off, indicating the AVDD current monitoring abnormality; the seventh red light is on and the seventh green light is off, indicating the temperature monitoring abnormality; and the eighth red light is on and the eighth green light is off, indicating the frame rate monitoring abnormality.

[0014] To solve the above technical problems, the application adopts another technical solution: providing a vehicle-mounted camera module detection method based on the vehicle-mounted camera module detection system, comprising the following steps:

[0015] System initialization, the vehicle-mounted camera module detection system is initialized, the device is enumerated and the voltage is configured, the communication link is ensured to be complete, the camera module to be tested is ensured to enter the working state;

[0016] Cyclic monitoring, the working parameters of the camera module to be tested are acquired according to the preset time interval, the working parameters include the voltage, current, frame rate and temperature of the camera module to be tested;

[0017] Abnormality determination, the working parameters are compared with the corresponding preset qualified threshold range, if any working parameter is out of limit, the corresponding abnormal warning is triggered and the test is terminated; if the total test time reaches the preset total time length and all the working parameters are not out of limit, the test is passed warning is triggered.

[0018] Further, in the initialization and pre-checking steps, the following sub-steps are included:

[0019] Initialization of the master control unit, the communication protocol and the timer of the master control unit are initialized, the communication protocol is IIC protocol;

[0020] Initialization of the test module, the communication between the camera module to be tested and the voltage control unit and the current monitoring unit is ensured to be normal through device enumeration, and the voltage control unit is controlled to configure the required working voltage for the camera module to be tested.

[0021] Further, in the step of initializing the master control unit, specifically including:

[0022] Initialization of the communication protocol, the communication rate of the IIC protocol is adjusted to a first rate threshold, the first rate threshold is 10-50 KHz;

[0023] Initialization of the timer, the time interval and the total test time of the timer are set according to the actual detection project.

[0024] Further, in the step of initializing the test module, the following sub-steps are included:

[0025] Enumerating the voltage control unit and the current monitoring unit, if enumeration is abnormal, the corresponding abnormal warning is triggered and the test is terminated, otherwise, the output voltage of the voltage control unit is controlled to provide the required working voltage for the camera module to be tested;

[0026] Enumerate the voltage control unit, current monitoring unit and camera module serial, if enumeration is abnormal, trigger the corresponding abnormal alarm and terminate the test, otherwise, initialize the camera module image sensor reset;

[0027] Enumerate the voltage control unit, current monitoring unit, camera module image sensor and serial, if enumeration is abnormal, trigger the corresponding abnormal alarm and terminate the test, otherwise, initialize the image sensor.

[0028] Further, after the step of initializing the host unit, further comprising: creating a log information file and a detection data file, recording and saving log information and detection data;

[0029] After the step of initializing the image sensor, further comprising:

[0030] Read the identity information of the image sensor and compare the read identity information with the pre-stored information, if the comparison result is inconsistent, trigger the corresponding abnormal alarm and terminate the test.

[0031] The subject name of the application has at least the following beneficial effects: by integrating the to-be-tested camera module, voltage control unit and current monitoring unit together and placing them in the thermostat, long-distance pressure loss can be avoided, target voltage can be directly provided, and operation is simplified; by placing the remaining units outside the thermostat and connecting them with the camera module through long-distance coaxial lines, the amount of vehicle-level devices in the thermostat can be reduced, and reliability and cost can be balanced; by providing multiple low-ripple voltages through the voltage control unit and flexibly controlling through the IIC protocol, different image sensor requirements can be adapted; without relying on image output, the camera module can be detected, the operation is simple, the camera module can be detected in time after completing part of the COB process, potential abnormalities can be quickly exposed; real-time monitoring, transmission and saving of working parameters are supported, and abnormal data comparison is intuitive; through the combination of red and green LED lamp groups and alarm groups, the type of abnormality can be accurately and intuitively prompted, and maintenance time is shortened; through the automatic process of initialization, cyclic monitoring and abnormality determination, manual intervention is reduced, and efficiency and accuracy are improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 The structural block diagram of an embodiment of the vehicle-mounted camera module detection system of the present application.

[0034] Figure 2Flow chart of the method for detecting the vehicle-mounted camera module according to an embodiment of the present application.

[0035] Figure 3 For Figure 2 Flow chart of step S100.

[0036] Figure 4 For Figure 3 Flow chart of step S130.

[0037] Figure 5 Temperature statistical chart of the abnormal module collected in the same time interval.

[0038] Figure 6 AVDD voltage statistical chart of the abnormal module collected in the same time interval.

[0039] Figure 7 DOVDD voltage statistical chart of the abnormal module collected in the same time interval.

[0040] Figure 8 DVDD voltage statistical chart of the abnormal module collected in the same time interval.

[0041] Figure 9 Frame rate statistical chart of the normal module collected in the same time interval.

[0042] Figure 10 Temperature statistical chart of the normal module collected in the same time interval.

[0043] Figure 11 AVDD voltage statistical chart of the normal module collected in the same time interval.

[0044] Figure 12 DOVDD voltage statistical chart of the normal module collected in the same time interval.

[0045] Figure 13 AVDD current statistical chart of the normal module collected in the same time interval.

[0046] Figure 14 DOVDD current statistical chart of the normal module collected in the same time interval.

[0047] Figure 15 DVDD current statistical chart of the normal module collected in the same time interval. DETAILED DESCRIPTION

[0048] The present application will be further described below with reference to the accompanying drawings.

[0049] Please refer to Figure 1The vehicle-mounted camera module detection system of the present application comprises a thermostat for providing a test environment, a camera module to be tested arranged in the thermostat, a current monitoring unit, a voltage control unit, and a main control unit, an information transmission and storage unit, and a display reminding unit arranged outside the thermostat. The camera module to be tested, the current monitoring unit, and the voltage control unit are integrated into a test module, the information transmission and storage unit and the display reminding unit are respectively connected to the main control unit, the main control unit is connected to the test module through a coaxial line, and the length of the coaxial line is greater than or equal to a first length threshold value to physically isolate the main control unit and the test module in the test environment. In the present embodiment, the first length threshold value is set to a 2-meter coaxial line.

[0050] It should be understood that a plurality of camera modules can be simultaneously detected each time, and the detection state is displayed through the corresponding display reminding unit. In the present embodiment, because only the camera module to be tested, the current monitoring unit, and the voltage control unit are placed in the thermostat, the occupied area is not large, and therefore 6 camera modules can be simultaneously detected.

[0051] Because the camera module needs to be tested whether it can work in an extreme environment in the reliability test of the vehicle level, the camera module to be tested needs to be placed in a special scene such as high temperature and high pressure. However, other detection units cannot be placed in the scene under normal circumstances because the working temperature of general devices cannot meet the vehicle level -40℃~125℃ environment, otherwise the device will work abnormally, so only vehicle level devices can be used, but the cost of vehicle level devices is high. In order to reduce the cost, the units other than the camera module to be tested are arranged outside the thermostat in the initial design of the present application, and are connected to the camera module to be tested through a long distance coaxial line. However, a new problem arises in actual testing, that is, the long distance coaxial line will cause pressure loss. In order to provide the required working voltage for the camera module, for example, when the required working voltage is 1.1V, 1.2V voltage needs to be provided considering the pressure loss. The specific pressure loss needs to be calculated, and if the pressure loss needs to be calculated each time, the operation will become complex. In order to reduce the cost as much as possible, avoid unnecessary energy consumption, and reduce the operation difficulty, the camera module to be tested, the current monitoring unit, and the voltage control unit are integrated into a test module and placed in the thermostat, and the remaining units are arranged outside the thermostat. In this way, when the camera module to be tested requires a working voltage of 1.1V, a voltage of 1.1V is directly provided.

[0052] The main control unit is used for controlling the cooperative work of the units. The main control unit comprises a main control chip, and in the present embodiment, a main control chip of FK743M5-XIH6 type is adopted.

[0053] The voltage control unit is used to provide working voltage for the camera module under test under the control of the host unit to meet the detection requirements. The vehicle-mounted camera usually needs three voltages, AVDD, DOVDD and DVDD, and these voltages require small voltage ripple, especially the AVDD voltage. The voltage control unit mainly provides power supply for the image sensor in the camera module under test. Different image sensors require different voltages, such as 1.1V, 1.2V, 1.8V, 2.8V, 3.3V and even 4.0V. Therefore, the voltage control unit includes a power management integrated circuit and a low-voltage linear regulator to provide small-ripple working voltage for the vehicle-mounted camera. The power management integrated circuit is used to receive the instructions of the host unit and generate one or more basic voltages. In the embodiment, the power management integrated circuit provides three basic voltages. The low-dropout linear regulator is used to regulate the basic voltage to generate the working voltage required by the camera module. The host unit controls the output voltage value of the voltage control unit through the communication protocol (such as IIC protocol) to meet the detection requirements of different models of camera modules in different test environments.

[0054] It should be noted that both the voltage control unit and the current monitoring unit need to use automotive-grade chips. In the embodiment, the chip used by the power management integrated circuit is MP5470 of MPS, and the chip used by the linear regulator is LDO chip of Sirelec, such as TPL905228-S5TR, TPL905233-S5TR, TPL905240-S5TR, etc. These chips have the same package size, which is convenient for welding, replacement or switching different voltages by using a jumper cap to stabilize the required voltage.

[0055] The current monitoring unit and the image sensor in the camera module under test are used to obtain the working parameters of the camera module under test in real time. The working parameters include the voltage, current, frame rate and temperature of the camera module under test. Specifically, the current monitoring unit is used to detect the current of the camera module under test, and the voltage, temperature and frame rate are obtained by the register in the image sensor. In the embodiment, the chip used by the current monitoring unit is INA3221-Q1 current monitor.

[0056] The information transmission and storage unit is used to transmit and save the detection data and log information in real time. In order to be able to trace the detection situation in real time or afterwards, the information transmission and storage unit includes USB, USART and SD card, which opens the USB virtual serial port or USART serial port to observe the data in real time through the computer device, and saves the current log information and detection data in real time through the SD card.

[0057] The display reminding unit is used for outputting an alarm signal and reminding operation progress according to the working parameter of the to-be-tested camera module. The display reminding unit comprises an indicator light group and an alarm, and the indicator light group is a red-green LED light group, wherein the red-green LED light group is used for alarming the current abnormal detection condition through different light combinations; and the alarm is used for alarming when the test is terminated. The abnormal detection condition corresponding to different light combinations specifically comprises: all green lights are on and all red lights are off, indicating that the test is passed; all green lights are on and off alternately and all red lights are off, indicating that the test is in progress and no abnormality occurs at present; all green lights are off and all red lights are on, indicating that the abnormality of the basic function failure of the vehicle-mounted camera module detection system; the first red light is on and the first green light is off, indicating the DVDD voltage monitoring abnormality; the second red light is on and the second green light is off, indicating the DVDD current monitoring abnormality; the third red light is on and the third green light is off, indicating the DOVDD voltage monitoring abnormality; the fourth red light is on and the fourth green light is off, indicating the DOVDD current monitoring abnormality; the fifth red light is on and the fifth green light is off, indicating the AVDD voltage monitoring abnormality; the sixth red light is on and the sixth green light is off, indicating the AVDD current monitoring abnormality; the seventh red light is on and the seventh green light is off, indicating the temperature monitoring abnormality; and the eighth red light is on and the eighth green light is off, indicating the frame rate monitoring abnormality. In the embodiment, the test is terminated as long as the abnormality occurs, and the abnormality occurring before the working parameter of the camera module is detected is the abnormality of the basic function failure of the vehicle-mounted camera module detection system, at this time, all green lights are off and all red lights are on, and the alarm alarms at the same time.

[0058] Another embodiment of the present application further discloses a vehicle-mounted camera module detection method, which is realized based on the vehicle-mounted camera module detection system of the above-mentioned embodiment. Figure 2 The flowchart of an embodiment of the vehicle-mounted camera module detection method of the present application is shown in the figure, and the embodiment specifically comprises the following steps:

[0059] S100, system initialization.

[0060] Specifically, the vehicle-mounted camera module detection system is initialized, the device is enumerated, the voltage is configured, the communication link is ensured to be complete, and the to-be-tested camera module is ensured to be in the working state. Please refer to Figure 3 The step S100 comprises the following sub-steps:

[0061] S110, initialization of the master control unit.

[0062] Specifically, the communication protocol of the host unit and the timer are initialized, and the communication protocol is IIC protocol. It should be understood that when the host unit is initialized, the HAL library, system clock, RTC real-time clock, SDIO, etc. are also initialized in addition to the communication protocol and the timer. Specifically, when the communication protocol is initialized, the communication rate of the IIC protocol is adjusted to a first rate threshold. Since 2 meters of coaxial cable is used between the test module and the host unit, in order to improve signal integrity and stability, the IIC rate needs to be adjusted to 10-50KHz, and therefore the first rate threshold is 10-50KHz. When the timer is initialized, the time interval and the total test time of the timer need to be set according to the actual detection project. For example, the time interval is 3-4 seconds, and the total test time is 4-10 hours. It should be understood that when the host unit is initialized, the information transmission and storage unit and the display prompting unit are also initialized.

[0063] S130, initializing the test module.

[0064] Specifically, the device enumeration ensures that the camera module to be tested and the voltage control unit and the current monitoring unit communicate normally, and the test module is initialized under the premise of normal communication. Please refer to Figure 4 , this step S130 includes the following sub-steps:

[0065] S131, configuring the working voltage.

[0066] Specifically, the voltage control unit and the current monitoring unit are enumerated, if the enumeration is abnormal, the corresponding abnormal warning is triggered and the test is terminated, otherwise, the output voltage of the voltage control unit is controlled to provide the required working voltage for the camera module to be tested. This step is used to detect whether the voltage control unit and the current monitoring unit communicate normally, and then the output voltage of the voltage control unit is controlled through the IIC protocol to ensure that the three voltages provided to the camera module are stable. For example, a certain image sensor needs to output 2.8V for AVDD, 1.8V for DOVDD, and 1.05V for DVDD at room temperature; AVDD outputs 3.27V, DOVDD outputs 1.8V, and DVDD outputs 1.21V at high temperature and high pressure; another image sensor needs to output 3.3V for AVDD, 1.8V for DOVDD, and 1.1V for DVDD at room temperature; AVDD outputs 4.0V, DOVDD outputs 1.8V, and DVDD outputs 1.2V at high temperature and high pressure. If the voltage output does not meet the requirements, the corresponding abnormal warning is triggered and the test is terminated.

[0067] S132, initializing the serializer.

[0068] Specifically, the voltage control unit, the current monitoring unit, and the serializer of the camera module are enumerated, if enumeration is abnormal, the corresponding abnormal alarm is triggered and the test is terminated, otherwise, the serializer is initialized, the image sensor of the camera module is controlled to reset. The voltage control unit, the current monitoring unit, and the serializer of the camera module are enumerated. This step is used to detect whether the voltage control unit, the current monitoring unit, and the serializer device communicate normally, and in the case of ensuring normal communication, the serializer is initialized. The vehicle-mounted camera is loaded on the vehicle and needs to be connected to the host control unit through the serializer and deserializer for long-distance connection. The deserializer is on the host control unit, and the serializer is on the camera module. Long-distance transmission is realized through the GMSL protocol to ensure the stability of data, and the serializer of the camera module needs to be initialized. The serializer initialization includes the reset control of the image sensor, so that the image sensor can enumerate the device address and communicate. In order to ensure that the reset operation takes effect completely, a delay is set after the initialization is completed. In the embodiment, the delay time is 100 ms. If the serializer initialization is abnormal, the corresponding abnormal alarm is triggered and the test is terminated.

[0069] S133, initializing the image sensor.

[0070] Specifically, the voltage control unit, the current monitoring unit, the image sensor of the camera module, and the serializer are enumerated, if enumeration is abnormal, the corresponding abnormal alarm is triggered and the test is terminated, otherwise, the image sensor is initialized. This step is used to detect whether the voltage control unit, the current monitoring unit, the image sensor of the camera module, and the serializer communicate normally, and in the case of ensuring normal communication, the image sensor is initialized. The initialization of the image sensor is to write the working parameters to the image sensor in the camera module to be tested through the IIC protocol, so that it enters the working state and completes the image sensor lighting initialization. In the embodiment, the image sensor image output is not required, only the state of the related state register (such as the voltage register and the temperature register) is detected, so that the subsequent functional safety detection is completed. If the image sensor initialization is abnormal, the corresponding abnormal alarm is triggered and the test is terminated.

[0071] As a preferred embodiment, after step S133, it further includes:

[0072] Read the identity information of the image sensor and compare the read identity information with the pre-stored information. If the comparison result is inconsistent, trigger the corresponding abnormal warning and terminate the test. This step is used for camera module identification and differentiation. For example, read the chip ID (similar to the ID number), module ID (may be mislabeled, which is usually used to distinguish different image sensors from the same image sensor factory), and version ID (used to distinguish multiple versions of the same image sensor, some versions cannot be used for mass production) of each image sensor.

[0073] In order to facilitate the traceability of the situation in the detection process, as a preferred embodiment, after step S110, the following steps are further included:

[0074] S120, create a log information file and a detection data file.

[0075] Specifically, create a log information file and a detection data file to record and save log information and detection data. In this embodiment, "log.txt" and "function safety detection.xls" files are created and generated directly on the SD card. The "log.txt" file is used to record log information, and the "function safety detection.xls" file is used to record detection data. If an abnormality occurs, trigger the corresponding abnormal warning and terminate the test.

[0076] In this embodiment, the abnormality occurring in step S100 corresponds to the abnormality of the failure of the basic function of the vehicle-mounted camera module detection system. When the abnormal warning is triggered, all green lights in the display reminder unit are off and all red lights are on, and the alarm is sounded.

[0077] S200, cyclic monitoring.

[0078] Specifically, the working parameters of the camera module to be tested are obtained according to the preset time interval, and the working parameters include the voltage, current, frame rate number and temperature of the camera module to be tested. Specifically, after completing the system initialization, start the timer interrupt and begin timing. The timer triggers an interrupt periodically at a preset time interval. Each interrupt triggers a function safety detection of the camera module to be tested, i.e. reads the relevant register state, such as reading the current frame count, voltage, temperature and other registers in the image sensor until the test is terminated or the total test time reaches the preset value. The calculation formula of the frame rate number is as follows:

[0079]

[0080] Wherein, fps represents frame rate, currentframe represents frame count before current time interval timing, previousframe represents frame count when timer timing time reaches time interval, and MonitorStatusInterval represents time interval.

[0081] S300, Abnormality determination.

[0082] Specifically, the working parameters are compared with the corresponding preset qualified threshold range, if any working parameter is out of limit, the corresponding abnormality alarm is triggered and the test is terminated; if the total test time reaches the preset total time length and all the working parameters are not out of limit, the pass test alarm is triggered.

[0083] For example, under normal temperature and pressure, the three voltages output by the voltage control unit are respectively: DVDD: 1.05V, DOVDD: 1.8V, AVDD: 2.8V; the preset qualified range of each working parameter is shown in Table 1.

[0084] Serial number Operating parameter Qualified range 1 VDVDD@1.15V [1.05V, 1.25V] 2 IDVDD@1.15V [100mA, 300mA] 3 VDOVDD@1.8V [1.7V, 1.9V] 4 IDOVDD@1.8V [60mA, 100mA] 5 VAVDD@2.8V [2.66V, 2.94V] 6 IAVDD@2.8V [50mA, 90mA] 7 Temp [20℃，75℃] 8 Frame rate (29fps, 31fps) excluding 29 and 31

[0085] Table 1

[0086] Please refer to Figure 5 to Figure 8 The statistical data of abnormal modules shows that the lowest temperature is 30.25℃ and the highest temperature is 81.6875℃, which exceeds the qualified range; the lowest AVDD voltage is 2.601V and the highest AVDD voltage is 2.878V, which exceeds the qualified range; the lowest DOVDD voltage is 1.536V and the highest DOVDD voltage is 2.046V, which exceeds the qualified range; the lowest DVDD voltage is 0.769V and the highest DVDD voltage is 1.279V, which exceeds the qualified range.

[0087] Please refer to Figure 9 to Figure 15 The statistical data of normal modules shows that, according to 4800 collected data, the frame rate is in [30-30.3333] fps, which is qualified; the lowest temperature is 42.375℃ and the highest temperature is 73.25℃, which is qualified; the lowest AVDD voltage is 2.758V and the highest AVDD voltage is 2.777V, which is qualified; the lowest AVDD current is 72.4mA and the highest AVDD current is 73.2mA, which is qualified; the lowest DOVDD voltage is 1.758V and the highest DOVDD voltage is 1.776V, which is qualified; the lowest DOVDD current is 80.8mA and the highest DOVDD current is 82mA, which is qualified; the lowest DVDD voltage is 1.151V and the highest DVDD voltage is 1.171V, which is qualified; the lowest DVDD current is 167.2mA and the highest DVDD current is 255.6mA, which is qualified.

[0088] The abnormality detection alarm is made by the display reminding unit, specifically, when the DVDD voltage monitoring is abnormal, the test ends, the first red light is on and the first green light is off, and the alarm is sounded at the same time; when the DVDD current monitoring is abnormal, the test ends, the second red light is on and the second green light is off, and the alarm is sounded at the same time; when the DOVDD voltage monitoring is abnormal, the test ends, the third red light is on and the third green light is off, and the alarm is sounded at the same time; when the DOVDD current monitoring is abnormal, the test ends, the fourth red light is on and the fourth green light is off, and the alarm is sounded at the same time; when the AVDD voltage monitoring is abnormal, the test ends, the fifth red light is on and the fifth green light is off, and the alarm is sounded at the same time; when the AVDD current monitoring is abnormal, the test ends, the sixth red light is on and the sixth green light is off, and the alarm is sounded at the same time; when the temperature monitoring is abnormal, the test ends, the seventh red light is on and the seventh green light is off, and the alarm is sounded at the same time; when the frame rate monitoring is abnormal, the test ends, the eighth red light is on and the eighth green light is off, and the alarm is sounded at the same time; when the total test time reaches the preset total time length and all the working parameters are not over limited, the test ends, all the green lights are on and all the red lights are off, and the alarm is sounded at the same time; when the test is in progress and there is no abnormality at present, the test has not ended, all the green lights are on and off alternately and all the red lights are off, and the alarm is not sounded.

[0089] The application can avoid long distance pressure loss, directly provide target voltage, and simplify operation by integrating the to-be-tested camera module, the voltage control unit and the current monitoring unit together and placing them in the thermostat; can reduce the amount of vehicle-level devices in the thermostat, balance reliability and cost by placing the remaining units outside the thermostat and connecting them with the camera module through long distance coaxial lines; can adapt to different image sensor requirements by providing multiple low-ripple voltages through the voltage control unit and flexibly controlling through IIC protocol; can realize detection of the camera module without relying on image output, is simple to operate, can timely detect the camera module after completing part of the COB process, and can quickly expose potential abnormalities; can support whole-process tracing by real-time monitoring, transmission and saving of working parameters, and can intuitively compare abnormal data; can accurately and intuitively prompt abnormal types by combining red and green LED light groups with alarms, and can shorten maintenance time; can reduce manual intervention and improve efficiency and accuracy through the automatic process of initialization, cycle monitoring and abnormality determination.

[0090] The above merely expresses the preferred embodiments of the application, which are described in detail, but should not be construed as limiting the scope of the patent. It should be noted that, for those skilled in the art, without departing from the concept of the application, several modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A vehicle-mounted camera module testing system, characterized in that, include: A constant temperature chamber for providing a test environment, a camera module under test installed in the constant temperature chamber, a current monitoring unit, a voltage control unit, and a main control unit, an information transmission and storage unit, and a display and reminder unit installed outside the constant temperature chamber; The camera module under test, the current monitoring unit, and the voltage control unit are integrated into a test module. The information transmission and storage unit and the display and reminder unit are both connected to the main control unit. The main control unit is connected to the test module via a coaxial cable. The length of the coaxial cable is greater than or equal to a first length threshold to achieve physical isolation between the main control unit and the test module in the test environment.

2. The vehicle-mounted camera module detection system as described in claim 1, characterized in that: The main control unit is used to control the coordinated operation of each unit; the voltage control unit is used to provide the working voltage to the camera module under test under the control of the main control unit to meet the testing requirements; the current monitoring unit and the image sensor in the camera module under test are used to acquire the working parameters of the camera module under test in real time, including the voltage, current, frame rate and temperature of the camera module under test; the information transmission and storage unit is used to transmit and save the test data and log information in real time; the display and reminder unit is used to output warning signals and remind the operation progress according to the working parameters of the camera module under test.

3. The vehicle-mounted camera module detection system as described in claim 1, characterized in that... The voltage control unit includes a power management integrated circuit and a low-voltage linear regulator; the power management integrated circuit is used to receive instructions from the main control unit and generate one or more base voltages; the low-dropout linear regulator is used to regulate the base voltage to generate the operating voltage required by the camera module, the operating voltage including AVDD, DOVDD and DVDD. The main control unit controls the output voltage of the power management integrated circuit and the low dropout linear regulator through a communication protocol to meet the testing requirements of different camera modules in different testing environments.

4. The vehicle-mounted camera module detection system as described in claim 1, characterized in that, The display and reminder unit includes an indicator light group and an alarm. The indicator light group is a red and green LED light group, wherein: The red and green LED light group is used to warn of the current abnormal detection situation through different lighting combinations; The alarm is used to sound an alarm when the test is terminated.

5. The vehicle-mounted camera module detection system as described in claim 4, characterized in that, The specific anomaly detection scenarios corresponding to different light combinations include: All green lights on and all red lights off indicate a successful test; all green lights alternating on and off and all red lights off indicate a test in progress with no current issues; all green lights off and all red lights on indicate a malfunction in the vehicle camera module detection system's basic functions; the first red light on and the first green light off indicates a DVDD voltage monitoring malfunction; the second red light on and the second green light off indicates a DVDD current monitoring malfunction; the third red light on and the third green light off indicates a DOVDD voltage monitoring malfunction; the fourth red light on and the fourth green light off indicates a DOVDD current monitoring malfunction; the fifth red light on and the fifth green light off indicates an AVDD voltage monitoring malfunction; the sixth red light on and the sixth green light off indicates an AVDD current monitoring malfunction; the seventh red light on and the seventh green light off indicates a temperature monitoring malfunction; and the eighth red light on and the eighth green light off indicates a frame rate monitoring malfunction.

6. A method for detecting vehicle-mounted camera modules based on the vehicle-mounted camera module detection system according to any one of claims 1 to 5, characterized in that, Includes the following steps: System initialization: The vehicle-mounted camera module detection system is initialized by enumerating devices and configuring voltages to ensure the integrity of the communication link and enable the camera module under test to enter the working state. The system performs cyclic monitoring and acquires the operating parameters of the camera module under test according to a preset time interval. The operating parameters include the voltage, current, frame rate, and temperature of the camera module under test. Anomaly detection involves comparing the operating parameters with their corresponding preset acceptable threshold ranges. If any operating parameter exceeds the limit, a corresponding anomaly warning is triggered and the test is terminated. If the total test time reaches the preset total duration and all operating parameters do not exceed the limit, a test pass warning is triggered.

7. The vehicle-mounted camera module detection method as described in claim 6, characterized in that, The initialization and pre-check steps include the following sub-steps: Initialize the main control unit, including its communication protocol and timer. The communication protocol is the IIC protocol. Initialize the test module, ensure normal communication between the camera module under test, the voltage control unit, and the current monitoring unit through device enumeration, and initialize the test module under the premise that the communication is normal.

8. The vehicle-mounted camera module detection method as described in claim 7, characterized in that, The initialization steps for the main control unit specifically include: Initialize the communication protocol and adjust the communication rate of the IIC protocol to a first rate threshold, which is 10-50 kHz. Initialize the timer, setting the time interval and total test time according to the actual testing items.

9. The vehicle-mounted camera module detection method as described in claim 7, characterized in that, The initialization of the test module includes the following sub-steps: The voltage control unit and current monitoring unit are enumerated. If an enumeration is abnormal, the corresponding abnormal warning is triggered and the test is terminated. Otherwise, the output voltage of the voltage control unit is controlled to provide the required operating voltage to the camera module under test. The serializer of the voltage control unit, current monitoring unit and camera module is enumerated. If the enumeration is abnormal, the corresponding abnormal warning is triggered and the test is terminated. Otherwise, the serializer is initialized and the image sensor of the camera module is reset. The system enumerates the voltage control unit, current monitoring unit, image sensor of the camera module, and serializer. If an enumeration error occurs, the corresponding error warning is triggered and the test is terminated; otherwise, the image sensor is initialized.

10. The vehicle-mounted camera module detection method as described in claim 8, characterized in that, After initializing the main control unit, the process also includes: creating log information files and detection data files, recording and saving log information and detection data; Following the step of initializing the image sensor, the following steps are also included: The system reads the identification information from the image sensor and compares it with the pre-stored information. If the comparison results are inconsistent, the system triggers the corresponding abnormal warning and terminates the test.

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