Monitoring circuit, vehicle-mounted monitoring circuit and automatic driving vehicle
By designing a monitoring circuit including MIPI CSI controller, GMSL and AHD monitoring video decoding unit and resistor switching circuit, the problem of designing multiple hardware circuit solutions in the prior art is solved, and a unified adaptation of GMSL and AHD protocol cameras is achieved, which reduces hardware cost and management complexity.
Patent Information
- Application Number
- CN202422259313.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-13
AI Technical Summary
The existing on-board monitoring system requires the design of two hardware circuit solutions to adapt to the differences between GMSL and AHD protocol cameras, resulting in complex hardware management, high cost and inconvenient application.
A monitoring circuit is designed, including a MIPI CSI controller, GMSL and AHD monitoring video decoding unit, and a resistor switching circuit, and adapting the signals of cameras of different protocols through resistor selection and welding.
It realizes a surveillance camera that is adapted to GMSL and AHD protocols at the same time, reducing hardware development and maintenance costs and not changing the original design of the main control system.
Smart Images
Figure CN223040064U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of simple vehicle-mounted monitoring circuits, and particularly to a monitoring circuit, a vehicle-mounted monitoring circuit, and an autonomous driving vehicle. Background Art
[0002] Vehicle-mounted devices usually consist of multiple cameras to achieve full coverage monitoring around the vehicle, and finally transmit the video monitoring signals to the main control unit for processing. According to different prices and application environments, vehicle-mounted monitoring cameras usually have AHD protocol interface cameras and GMSL protocol cameras. As a vehicle-grade device, the GMSL protocol camera has a simple connection (usually only two wires are transmitted through a coaxial cable) and is relatively expensive. The AHD camera is used in general vehicle-mounted environments, requires four wires for transmission, and is inexpensive. Therefore, for a general main control device, two hardware circuit solutions need to be designed to meet the requirements of different application scenarios.
[0003] For GMSL protocol cameras, the hardware monitoring solution is as Figure 1 shown. Four external GMSL cameras are connected to the host. Inside the host, the four-channel camera signals are decoded and packaged into the MIPI bus by a GMSL-to-MIPI protocol chip and sent to the main control unit. For AHD protocol cameras, the hardware monitoring solution is as Figure 2 shown. Four external AHD cameras are connected to the host. Inside the host, the four-channel camera signals are decoded and packaged into the MIPI bus by an AHD-to-MIPI protocol chip and sent to the main control unit.
[0004] For vehicle-mounted monitoring, since there are two types of cameras with different GMSL and AHD protocols, when the main control device is adapted, it is necessary to consider designing two different hardware circuits and connecting them to the corresponding monitoring cameras. For hardware workers, this requires designing and maintaining two hardware versions, which brings corresponding troubles to hardware management and designers; the non-universality between the two devices also brings inconvenience to actual applications;
[0005] In addition, in some solutions, a dedicated analog switch chip is required, which increases the complexity of circuit design and chip cost, and also requires increasing the IO port resources of the main control CPU processor to output two types of control signals, and the original design of the main control system needs to be changed, increasing the software design workload. Summary of the Utility Model
[0006] Embodiments of this application provide a monitoring circuit, a vehicle-mounted monitoring circuit, and an autonomous driving vehicle to enable the monitoring circuit to be adapted to the inputs of both GMSL monitoring cameras and AHD monitoring cameras at the same time. Thus, the channel adjustment can be directly completed by production workers on the production line without the need for re-development of software and hardware, with low hardware costs and a simple and reliable implementation method.
[0007] The embodiments of the present application adopt the following technical solutions:
[0008] In a first aspect, an embodiment of the present application provides a monitoring circuit, where the circuit includes: an MIPI CSI controller, a GMSL monitoring video decoding unit, and an AHD monitoring video decoding unit, and further includes a resistance switching circuit. The GMSL monitoring video decoding unit is connected to the MIPI CSI controller through the resistance switching circuit, or the AHD monitoring video decoding unit is connected to the MIPI CSI controller through the resistance switching circuit.
[0009] In some embodiments, the resistance switching circuit is used to switch two monitored inputs decoded by a decoding chip into one MIPI signal input to the MIPI CSI controller through hardware resistance selective soldering.
[0010] In some embodiments, the resistance switching circuit includes a first resistor and a second resistor. The two signal lines are combined into one output through the first resistor and the second resistor, where the output ends of the first resistor and the second resistor are connected together and the input ends are respectively connected to the GMSL monitoring video decoding unit and the AHD monitoring video decoding unit, and only one monitored video decoding unit is turned on.
[0011] In some embodiments, the first resistor and the second resistor adopt a common pad design structure.
[0012] When using an AHD monitored video transmission line, it is soldered to the first resistor to turn on the AHD monitored video transmission line.
[0013] When using a GMSL monitored video transmission line, it is soldered to the second resistor to turn on the GMSL monitored video transmission line.
[0014] In some embodiments, the AHD monitored video transmission line and the GMSL monitored video transmission line include 5 groups of 10 signals.
[0015] In some embodiments, the MIPI CSI controller receives the MIPI CSI signal selectively soldered by the resistance switching circuit. The MIPI CSI signal includes a group of clock CLK and four groups of Lane data signals Data.
[0016] In some embodiments, the GMSL monitoring video decoding unit and the AHD monitoring video decoding unit are respectively electrically connected to a GMSL monitoring camera and an AHD monitoring camera.
[0017] In some embodiments, both the GMSL monitoring camera and the AHD monitoring camera include four channels.
[0018] The GMSL monitoring video decoding unit decodes the four-channel AHD monitoring video into digital video signals and packages them into the MIPI CSI protocol, or the AHD monitoring video decoding unit decodes the four-channel GMSL monitoring video into digital video signals and packages them into the MIPI CSI protocol.
[0019] In a second aspect, an embodiment of the present application further provides a vehicle-mounted monitoring circuit, which includes the monitoring circuit described in the first aspect.
[0020] In a third aspect, an embodiment of the present application further provides a self-driving vehicle, which includes the vehicle-mounted monitoring circuit described in the first aspect.
[0021] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: The monitoring circuit includes: an MIPI CSI controller, a GMSL monitoring video decoding unit, and an AHD monitoring video decoding unit. It also includes a resistance switching circuit. The GMSL monitoring video decoding unit is connected to the MIPI CSI controller through the resistance switching circuit, or the AHD monitoring video decoding unit is connected to the MIPI CSI controller through the resistance switching circuit. The above monitoring circuit can integrate the monitoring camera circuits of GMSL and AHD with different protocols on one hardware circuit board, and achieve the purpose that one hardware circuit board can adapt to different monitoring schemes through resistance selective soldering. At the same time, it reduces the costs of hardware development and maintenance, and does not change the original design of the main control system. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:
[0023] Figure 1 It is a schematic diagram of the hardware monitoring scheme for the GMSL protocol camera;
[0024] Figure 2 It is a schematic diagram of the hardware monitoring scheme for the AHD protocol camera;
[0025] Figure 3 It is a schematic diagram of the internal structure of the monitoring circuit in the embodiment of the present application;
[0026] Figure 4 It is a schematic diagram of the circuit principle of the monitoring circuit in the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments of this application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.
[0028] The following will detail the technical solutions provided by each embodiment of this application in conjunction with the drawings.
[0029] An embodiment of this application provides a monitoring circuit. As Figure 3 shown, an internal schematic diagram of the monitoring circuit in the embodiment of this application is provided. The circuit includes: an MIPI CSI controller 310, a GMSL monitoring video decoding unit 320, and an AHD monitoring video decoding unit 330. It further includes a resistor switching circuit 340. The GMSL monitoring video decoding unit 320 is connected to the MIPI CSI controller 310 through the resistor switching circuit 340, or the AHD monitoring video decoding unit 330 is connected to the MIPI CSI controller 310 through the resistor switching circuit 340.
[0030] The GMSL monitoring video decoding unit 320 is connected to the MIPI CSI controller 310 through the resistor switching circuit 340. The resistor switching circuit 340 switches the two-way monitoring inputs after being decoded by the decoding chip into a single MIPI signal through hardware resistor selective soldering and inputs it to the main control unit.
[0031] The AHD monitoring video decoding unit 330 is connected to the MIPI CSI controller 310 through the resistor switching circuit 340. The resistor switching circuit 340 switches the two-way monitoring inputs after being decoded by the decoding chip into a single MIPI signal through hardware resistor selective soldering and inputs it to the main control unit.
[0032] The above monitoring circuit can integrate four monitoring cameras for each of the two different protocols, GMSL and AHD, on a single hardware circuit board. Through resistor selective soldering, the purpose of a single hardware circuit board being able to adapt to different monitoring solutions can be achieved. At the same time, the costs of hardware development and maintenance are reduced, and the original design of the main control system is not modified.
[0033] In an embodiment of this application, the resistor switching circuit 340 is used to switch the two-way monitoring inputs after being decoded by the decoding chip into a single MIPI signal through hardware resistor selective soldering and input it to the MIPI CSI controller.
[0034] The resistance switching circuit 340 switches the two monitored inputs decoded by the decoding chip into one MIPI signal through hardware resistor selective soldering and inputs it to the MIPI CSI controller 310 of the main control unit.
[0035] In an embodiment of the present application, the resistance switching circuit includes a first resistor and a second resistor. The two signal lines are combined into one output through the first resistor and the second resistor. The output ends of the first resistor and the second resistor are connected together, and the input ends are respectively connected to the GMSL monitored video decoding unit and the AHD monitored video decoding unit, and only one monitored video decoding unit is turned on.
[0036] The resistor plays a role in signal coupling and switching. The two signal lines are combined into one output through two resistors (the first resistor and the second resistor). The outputs of the two resistors are connected together, and the inputs are respectively connected to the outputs of two MIPI decoding chips. Specifically, when implementing, 5 groups of 10 signals are used, and a total of 20 such resistors are required for switching.
[0037] In an embodiment of the present application, the first resistor and the second resistor adopt a common pad design structure. When using the AHD monitored video transmission line, it is soldered to the first resistor to turn on the AHD monitored video transmission line; when using the GMSL monitored video transmission line, it is soldered to the second resistor to turn on the GMSL monitored video transmission line.
[0038] The hardware adopts a common pad design, that is, the output ends of the two resistors use the same pad, and the inputs are respectively connected to the two decoding chips. This can minimize the high-speed signal integrity problem caused by forked wiring to the greatest extent; when using four-way AHD monitored video, solder the R1 resistor (the first resistor), and when using four-way GMSL monitored video, solder the R2 resistor (the second resistor). The output ends of R1 and R2 (the first resistor and the second resistor) share a common pad in the PCB design.
[0039] In an embodiment of the present application, the AHD monitored video transmission line and the GMSL monitored video transmission line include 5 groups of 10 signals.
[0040] As Figure 4 shown, when using four-way camera signals as inputs, the AHD monitored video transmission line and the GMSL monitored video transmission line adopt 5 groups of 10 signals.
[0041] In one embodiment of the present application, the MIPI CSI controller receives the MIPI CSI signal sent by selective soldering through the resistor switching circuit, and the MIPI CSI signal includes a group of clock CLK and four groups of Lane data signals Data.
[0042] As Figure 4 shown, the MIPI CSI controller 310 receives the CSI signal sent by resistor selective soldering, and the MIPI CSI signal is composed of the clock CLK and four groups of Lane data signals Data[1:4].
[0043] In one embodiment of the present application, the GMSL monitoring video decoding unit and the AHD monitoring video decoding unit are respectively electrically connected to the GMSL monitoring camera and the AHD monitoring camera.
[0044] As Figure 4 shown, the GMSL monitoring video decoding unit is electrically connected to the GMSL monitoring camera, and the AHD monitoring video decoding unit is electrically connected to the AHD monitoring camera as an input.
[0045] In one embodiment of the present application, both the GMSL monitoring camera and the AHD monitoring camera include four channels. The GMSL monitoring video decoding unit decodes the four-channel AHD monitoring video into a digital video signal and packs it into the MIPI CSI protocol, or the AHD monitoring video decoding unit decodes the four-channel GMSL monitoring video into a digital video signal and packs it into the MIPI CSI protocol.
[0046] As Figure 4 shown, it is compatible with four-channel AHD monitoring cameras and four-channel GMSL monitoring cameras at the same time. Video decoding is implemented using a mature chip, and the four-channel AHD monitoring video is decoded into a digital video signal and packed into the MIPI CSI protocol, or the four-channel GMSL monitoring video is decoded into a digital video signal and packed into the MIPI CSI protocol.
[0047] In an embodiment of the present application, a vehicle-mounted monitoring circuit is further provided, which includes the monitoring circuit described above. The circuit includes: an MIPI CSI controller, a GMSL monitoring video decoding unit, and an AHD monitoring video decoding unit, and further includes a resistor switching circuit. The GMSL monitoring video decoding unit is connected to the MIPI CSI controller through the resistor switching circuit, or the AHD monitoring video decoding unit is connected to the MIPI CSI controller through the resistor switching circuit.
[0048] Based on the design scheme of the in-vehicle device monitoring circuit, four monitoring camera channels can be selected and gated through the common pad resistor selective soldering, enabling a single hardware circuit board to simultaneously adapt to the inputs of four GMSL monitoring cameras and four AHD monitoring cameras. As a result, production workers can directly complete channel adjustment on the production line without the need for re-development of software and hardware, with low hardware costs and a simple and reliable implementation method.
[0049] In some embodiments, the resistor switching circuit in the in-vehicle monitoring circuit is used to switch two monitoring inputs decoded by a decoding chip into one MIPI signal through hardware resistor selective soldering and input it to the MIPI CSI controller.
[0050] In some embodiments, the resistor switching circuit in the in-vehicle monitoring circuit includes a first resistor and a second resistor, which combine two signal lines into one output through the first resistor and the second resistor, where the output ends of the first resistor and the second resistor are connected together and the input ends are respectively connected to the GMSL monitoring video decoding unit and the AHD monitoring video decoding unit.
[0051] In some embodiments, the first resistor and the second resistor in the in-vehicle monitoring circuit adopt a common pad design structure.
[0052] When using the AHD monitoring video transmission line, it is soldered to the first resistor.
[0053] When using the GMSL monitoring video transmission line, it is soldered to the second resistor.
[0054] In some embodiments, the AHD monitoring video transmission line and the GMSL monitoring video transmission line in the in-vehicle monitoring circuit include 5 groups of 10 signals.
[0055] In some embodiments, the MIPI CSI controller in the in-vehicle monitoring circuit receives the MIPI CSI signal sent by the resistor switching circuit through selective soldering, and the MIPI CSI signal includes a group of clock CLK and four groups of Lane data signals Data.
[0056] In some embodiments, the GMSL monitoring video decoding unit and the AHD monitoring video decoding unit in the in-vehicle monitoring circuit are respectively electrically connected to the GMSL monitoring camera and the AHD monitoring camera.
[0057] In some embodiments, both the GMSL monitoring camera and the AHD monitoring camera in the in-vehicle monitoring circuit include four channels.
[0058] The GMSL monitoring video decoding unit decodes four-channel AHD monitoring videos into digital video signals and packs them into the MIPI CSI protocol, or the AHD monitoring video decoding unit decodes four-channel GMSL monitoring videos into digital video signals and packs them into the MIPI CSI protocol.
[0059] In an embodiment of the present application, an autonomous vehicle is further provided, which includes the in-vehicle monitoring circuit described above.
[0060] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.
Claims
1. A monitoring circuit, wherein: The circuit includes: a MIPI CSI controller, a GMSL monitoring video decoding unit and an AHD monitoring video decoding unit, and also includes a resistor switching circuit, the GMSL monitoring video decoding unit is connected to the MIPI CSI controller through the resistor switching circuit, or the AHD monitoring video decoding unit is connected to the MIPI CSI controller through the resistor switching circuit.
2. The circuit as claimed in claim 1, wherein: The resistor switching circuit is used to switch the two monitoring inputs decoded by the decoding chip into one MIPI signal input to the MIPI CSI controller through hardware resistor selection welding.
3. The circuit as claimed in claim 2, wherein: The resistor switching circuit includes a first resistor and a second resistor, and two signal lines are merged into one output through the first resistor and the second resistor, wherein the output ends of the first resistor and the second resistor are connected together and the input ends are respectively connected to the GMSL monitoring video decoding unit and the AHD monitoring video decoding unit, and only one monitoring video decoding unit is connected.
4. The circuit as claimed in claim 3, wherein: The first resistor and the second resistor adopt a common pad design structure. When an AHD monitoring video transmission line is used, it is welded to the first resistor to connect the AHD monitoring video transmission line; When the GMSL monitoring video transmission line is used, it is welded to the second resistor to connect the GMSL monitoring video transmission line.
5. The circuit as claimed in claim 4, wherein: The AHD monitoring video transmission line and the GMSL monitoring video transmission line include 5 groups of 10 signals.
6. The circuit as claimed in claim 1, wherein: The MIPI CSI controller receives a MIPI CSI signal sent through the resistor switching circuit, where the MIPI CSI signal includes a group of clock CLK and four groups of Lane data signals Data.
7. The circuit as claimed in claim 1, wherein: The GMSL monitoring video decoding unit and the AHD monitoring video decoding unit are electrically connected to the GMSL monitoring camera and the AHD monitoring camera respectively.
8. The circuit as claimed in claim 7, wherein: The GMSL monitoring camera and the AHD monitoring camera both include four channels, The GMSL monitoring video decoding unit decodes four channels of AHD monitoring videos into digital video signals and packages them into the MIPI CSI protocol, or the AHD monitoring video decoding unit decodes four channels of GMSL monitoring videos into digital video signals and packages them into the MIPI CSI protocol.
9. A vehicle-mounted monitoring circuit, wherein: The monitoring circuit comprises a monitoring circuit as claimed in any one of claims 1 to 8.
10. An autonomous driving vehicle, wherein: Includes the vehicle-mounted monitoring circuit as described in claim 9.