Aging evaluation device for vehicle-mounted camera

Abstract

The utility model discloses an aging evaluation device of a vehicle-mounted camera, which comprises a case and a central processing main control board arranged in the case, and the central processing main control board is provided with an FPD-LINK deserializing board used for receiving FPD-LINK signals of a plurality of vehicle-mounted camera modules; the FPD-LINK deserializing board is electrically connected with the central processing main control board through an I2C interface, an FAKRA connector is adopted as the interface of the FPD-LINK deserializing board, and received signals are converted into standard MIPI signals through an FPD-LINK deserializing chip so as to obtain frame rate temperature information. The device is applied to aging evaluation in the large-scale production and manufacturing process of the vehicle-mounted FPD-LINK camera, is also suitable for small-scale batch test and reliability test in the research and development process of the vehicle-mounted camera, and improves the test efficiency and accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical testing, and more specifically, to an aging evaluation device for a vehicle-mounted camera. Background Art

[0002] With the rapid development of information technology, cameras are increasingly used in the automotive field, and more and more cameras are used on the car body. Due to the special nature of automobiles, on-board cameras have very high requirements for reliability and stability, and must be shipped after rigorous testing and verification. Various aging test items that simulate harsh operating environments must also be carried out.

[0003] Traditional aging evaluation devices for vehicle-mounted cameras have the following defects: 1) They are mainly in the form of PCIE boards, with a limited number of access channels, mainly 4 or 8 channels, which limits the efficiency of large-scale testing; 2) The PCIE board space is limited by the PC motherboard and chassis, the camera access space is limited, the cables are relatively dense, the production deployment is cumbersome, and it is not conducive to subsequent maintenance and repair; 3) It is impossible to detect and record the electrical characteristics of the camera under test, such as current and voltage, in real time. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model provides an aging evaluation device for a vehicle-mounted camera, which is applied to aging evaluation during the large-scale production and manufacturing process of vehicle-mounted FPD-LINK cameras. It is also suitable for small-scale batch testing and reliability testing during the research and development of vehicle-mounted cameras, thereby improving test efficiency and accuracy.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an aging evaluation device for a vehicle-mounted camera, comprising a chassis and a central processing main control board arranged in the chassis, wherein the central processing main control board is equipped with an FPD-LINK deserialization board for receiving FPD-LINK signals of multiple vehicle-mounted camera modules; the FPD-LINK deserialization board is electrically connected to the central processing main control board through an I2C interface, and its interface adopts a FAKRA connector, and converts the received signal into a standard MIPI signal through an FPD-LINK deserialization chip to obtain frame rate temperature information.

[0006] Preferably, the chassis is a standard 4U-sized chassis.

[0007] Preferably, the evaluation device has multiple PCBAs built in, and the PCBAs use TCA9548APWR for bus expansion.

[0008] Preferably, a plurality of PCBAs are arranged at intervals along the vertical direction.

[0009] Preferably, the FPD-LINK deserialization board is also equipped with an ADC sampling circuit for current and voltage.

[0010] Preferably, the voltage sampling circuit uses resistor voltage division, and ADC SGM58013 performs analog-to-digital conversion.

[0011] Preferably, the sampling resistor is a 15mR sampling resistor.

[0012] Preferably, the deserialization circuit uses TI's DS90UB954 automotive-grade deserialization chip.

[0013] In summary, the utility model has the following beneficial effects:

[0014] 1. The chassis structure size of the evaluation device adopts the industrial 4U standard large-size chassis design, which can be easily matched and assembled with industrial cabinets and has a reliable structure;

[0015] 2. The communication interface of the evaluation device adopts USB design with good scalability;

[0016] 3. The circuit design of the evaluation device adds real-time current and voltage detection of the camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the aging evaluation device;

[0018] Figure 2 It is the left side view of the aging evaluation device;

[0019] Figure 3 This is the right side view of the aging evaluation device;

[0020] Figure 4 A top view of the aging evaluation device;

[0021] Figure 5 This is a schematic diagram of the structure of multiple PCBAs assembled inside the aging evaluation device;

[0022] Figure 6 It is a schematic diagram of the structure of the aging evaluation device;

[0023] Figure 7 It is a schematic diagram of the structure corresponding to the connector part on the aging evaluation device;

[0024] Figure 8 Principle of the aging evaluation device Figure 1 ;

[0025] Fig. 9 Principle of the aging evaluation device Figure 2 ;

[0026] Fig.10Principle of the aging evaluation device Figure 3 ;

[0027] Fig.11 Figure A is the key principle;

[0028] Fig.12 Figure B is the key principle;

[0029] Fig.13 Figure C is the key principle;

[0030] Fig.14 Figure A is the key principle 2;

[0031] Fig.15 Figure B is the key principle 2;

[0032] Fig.16 Figure A is the key principle three;

[0033] Fig.17 Figure B is the key principle. DETAILED DESCRIPTION

[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The modes described in the following exemplary embodiments do not represent all modes consistent with the present disclosure. Instead, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0035] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate a quantitative limitation, but indicate that there is at least one, and if only "one" is referred to, it will be separately described. "Multiple" or "several" means two or more. Unless otherwise specified, similar words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation, and are not limited to one position or one spatial orientation. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms "a", "said" and "the" used in this disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0036] The utility model is further described with reference to the accompanying drawings.

[0037] This embodiment discloses an aging evaluation device for a vehicle-mounted camera, the structure of which is as follows: Figures 1 to 6 As shown, it includes a chassis and a central processing main control board arranged in the chassis, and an FPD-LINK deserialization board for receiving FPD-LINK signals of multiple vehicle-mounted camera modules is installed on the central processing main control board. Preferably, the number of FPD-LINK deserialization boards is preferably 8, which can simultaneously receive FPD-LINK signals of 10 vehicle-mounted camera modules; the FPD-LINK deserialization board is electrically connected to the central processing main control board through an I2C interface, and its interface adopts a FAKRA connector, and converts the received signal into a standard MIPI signal through an FPD-LINK deserialization chip to obtain information such as frame rate and temperature. The central processing main control board is connected to the FPD-LINK deserialization board through the I2C interface to obtain the test results of 80 cameras, and transmits them to the computer through USB for real-time recording and analysis.

[0038] Traditional products are mainly in the form of PCIE boards, and the effective size of the PCIE board connector space is about 19mm*60mm; the chassis of this device is a standard 4U-sized chassis, which can be easily matched and assembled with industrial cabinets and has a reliable structure. Figure 7 As shown, the effective size of the connector space of the 4U chassis is approximately 446mm*177mm, and the new structural design enables the device to access more channels.

[0039] like Figure 5 As shown, the device has multiple PCBAs built in, and the multiple PCBAs are spaced apart in the vertical direction, that is, the multi-channel testing capability is achieved by stacking boards, and the heat dissipation of the device itself is fully considered to make it stable and reliable; the principle of the device is as follows Figures 8-10 As shown, FAKRA is used to connect the module to receive video data; CAM LED POWER is used to provide power to the module lighting LED; DS90UB954 is a deserialization chip; TCA9548A is an 8-way multiplexed I2C SWITCH chip, and a single bus can connect up to 8 chips.

[0040] The specific key principles are as follows:

[0041] Key principle 1: Figures 11 to 13 As shown, I2C bus expansion design

[0042] Traditional product design such as Fig.11 As shown in the figure, every two channels require a set of I2C bus and several GPIO ports for communication interaction. Due to the limited GPIO and I2C bus of the main control chip, it is impossible to achieve large-scale production efficiency of 80 channels.

[0043] This device adopts the I2C bus expansion design to realize the interaction between 1 I2C bus and 80 channel signals (as mentioned above Figures 8-10 shown)

[0044] This device has 8 built-in PCBAs, each of which uses TCA9548APWR for bus expansion.

[0045] As shown in the figure above: 1#PCBA bus address is set to 000, 2#PCBA bus address is set to 001,

[0046] Similarly, the bus address of 8#PCBA is set to 111 to achieve the expansion of the I2C bus.

[0047] Therefore, the first-level bus can be expanded to 8 TCA9548APWR

[0048] like Fig.12As shown, the secondary bus 0# (EX_I2C_SDA0&SCL0) can expand 10-channel vehicle cameras to achieve interactive testing.

[0049] The design of I2C expansion bus is one of the key technologies to realize multi-channel aging test system.

[0050] Key principle 2, such as Figures 14 and 15 As shown, the current and voltage sampling circuit

[0051] The voltage sampling circuit uses resistor voltage division and ADC SGM58013 performs analog-to-digital conversion.

[0052] The sampling resistor adopts a 15mR sampling resistor design, which can not only achieve high-precision current sampling, but also minimize the voltage drop on the sampling resistor.

[0053] The current sampling circuit uses a sampling resistor to convert the current into voltage, which is amplified 50 times by the TP181 amplifier and the ADC SGM58013 performs analog-to-digital conversion.

[0054] The SGM58031Q is a low-power, 16-bit, high-precision, delta-sigma ADC that supports an operating voltage range of 3V to 5.5V. The SGM58031Q filter has a data rate of up to 960SPS. The device has an on-chip PGA that provides an input voltage range as low as ±256mV and is AEC-Q100 qualified (-40°C+125°C) for automotive applications.

[0055] The TP181 series zero-drift, bidirectional current sense amplifier can sense the voltage drop across a shunt at a common-mode voltage range of -0.3V to 36V. The low offset of the zero-drift architecture enables current sensing with a maximum voltage drop across the shunt as low as 10mV full scale. The TP181 is specified for -40°C to +125°C.

[0056] High performance wide temperature range amplifier and ADC devices ensure circuit reliability.

[0057] Key Principles Figure 3 :like Figures 16 and 17 As shown, the deserialization circuit uses TI's DS90UB954 automotive-grade deserialization chip (schematic diagram and layout).

[0058] The key circuit has the following advantages: 1) Stable and reliable reception of FPDLINK data signals; 2) High-resolution current and voltage sampling; 3) Implementation of a multi-channel aging system.

[0059] The specified directions in this specific embodiment are only for the convenience of describing the positional relationship and the relationship of mutual coordination between the components. The above is only a preferred implementation of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. An aging evaluation device for a vehicle-mounted camera includes a chassis and a central processing main control board arranged in the chassis, and is characterized by: The central processing main control board is equipped with an FPD-LINK deserialization board for receiving FPD-LINK signals of multiple vehicle-mounted camera modules; the FPD-LINK deserialization board is electrically connected to the central processing main control board via an I2C interface, and its interface adopts a FAKRA connector, and converts the received signal into a standard MIPI signal through an FPD-LINK deserialization chip to obtain frame rate temperature information.

2. The aging evaluation device for a vehicle-mounted camera according to claim 1, characterized in that: The chassis is a standard 4U size chassis.

3. The aging evaluation device for a vehicle-mounted camera according to claim 1, characterized in that: The evaluation device has multiple PCBAs built in, and the PCBAs use TCA9548APWR for bus expansion.

4. The aging evaluation device for a vehicle-mounted camera according to claim 3 is characterized in that: A plurality of PCBAs are arranged at intervals along the vertical direction.

5. The aging evaluation device for a vehicle-mounted camera according to claim 1, characterized in that: The FPD-LINK deserialization board is also equipped with an ADC sampling circuit for current and voltage.

6. The aging evaluation device for a vehicle-mounted camera according to claim 5, characterized in that: The voltage sampling circuit uses resistor voltage division and ADC SGM58013 performs analog-to-digital conversion.

7. The aging evaluation device for a vehicle-mounted camera according to claim 6, characterized in that: The sampling resistor uses a 15mR sampling resistor.

8. The aging evaluation device for a vehicle-mounted camera according to claim 7, characterized in that: The deserialization circuit uses TI's DS90UB954 automotive-grade deserialization chip.

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