Image acquisition device detection circuit and vehicle

Abstract

The utility model discloses an image acquisition device detection circuit and a vehicle, electromagnetic interference at a signal output end of an image acquisition device is eliminated by using an electromagnetic interference elimination circuit, a voltage signal of the image acquisition device is acquired by using a sampling circuit, and the voltage signal is amplified by using an amplification circuit. And the controller obtains a working state detection result of the image acquisition device according to the amplified voltage signal, so that the accuracy of detection of the working state of the image acquisition device can be improved, meanwhile, the detection circuit is convenient and rapid to detect, a user can timely maintain and replace the image acquisition device in an abnormal working state, and the user experience is improved. And the user experience is improved.

Description

Technical Field

[0001] The utility model relates to an image acquisition device, in particular to a detection circuit of the image acquisition device and a vehicle. Background Art

[0002] The image acquisition device is used to realize image acquisition. By performing image analysis on the acquired images, people can interactively control smart devices based on the image analysis results. For example, when a user is driving a vehicle, he can adjust the vehicle's driving direction and position based on the video or image captured by the on-board camera.

[0003] However, when the onboard camera fails during driving, the assisted driving function cannot be used normally, affecting the user's driving safety. In the related art, when testing the image acquisition device, it is usually necessary to disassemble the image acquisition device in the smart device and perform fault detection manually, which is inconvenient and prone to errors. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide an image acquisition device detection circuit and a vehicle, which can improve the accuracy and efficiency of the working state detection of the image acquisition device.

[0005] In a first aspect, the utility model provides an image acquisition device detection circuit, comprising: an electromagnetic interference elimination circuit, a controller, a sampling circuit and an amplifying circuit; the signal output end of the image acquisition device is connected to the input end of the sampling circuit through the electromagnetic interference elimination circuit, the output end of the sampling circuit is connected to the input end of the amplifying circuit, and the output end of the amplifying circuit is connected to the controller;

[0006] The electromagnetic interference elimination circuit is used to eliminate electromagnetic interference at the signal output end of the image acquisition device;

[0007] The sampling circuit is used to collect the voltage signal of the image acquisition device;

[0008] The controller is used to obtain the working state detection result of the image acquisition device according to the voltage signal amplified by the amplifier circuit.

[0009] Optionally, the electromagnetic interference elimination circuit includes at least one electromagnetic interference filtering module; a first end of the electromagnetic interference filtering module is connected to a signal output end of an image acquisition device, and a second end of the electromagnetic interference filtering module is connected to an input end of the sampling circuit;

[0010] The electromagnetic interference filtering module includes an inductor and a resistor connected in parallel.

[0011] In the embodiment of the present application, by using parallel inductors and resistors as an electromagnetic interference filtering module, the user can adjust the total impedance of the circuit under high and low frequency conditions by adjusting the inductor or resistor, thereby eliminating electromagnetic interference caused by sudden voltage or current and improving the accuracy of detection of the image acquisition device detection circuit.

[0012] Optionally, the electromagnetic interference elimination circuit also includes a TVS tube; a first end of the TVS tube is connected to a signal output end of the image acquisition device, and a second end of the TVS tube is grounded.

[0013] In the embodiment of the present application, a TVS tube is connected to the signal output end of the image acquisition device to prevent damage to the circuit due to static electricity and improve the reliability of the circuit.

[0014] Optionally, magnetic beads are also included, and the magnetic beads are connected in series between the signal output end of the image acquisition device and the electromagnetic interference filtering module.

[0015] In the embodiment of the present application, by connecting magnetic beads in series between the signal output end of the image acquisition device and the electromagnetic interference filtering module, noise and interference at the signal output end of the image acquisition device are further filtered out, thereby improving the accuracy of the working status detection of the image acquisition device.

[0016] Optionally, the amplifying circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and an operational amplifier;

[0017] The positive input terminal of the operational amplifier is connected to the second end of the first resistor and the second end of the second resistor respectively, the first end of the first resistor is connected to the first output terminal of the sampling circuit, and the first end of the second resistor is grounded.

[0018] The negative input terminal of the operational amplifier is connected to the second end of the third resistor and the first end of the fourth resistor respectively, the first end of the third resistor is connected to the second output terminal of the sampling circuit, and the second end of the fourth resistor is connected to the output terminal of the operational amplifier;

[0019] The output end of the operational amplifier is connected to the controller.

[0020] In the embodiment of the present application, by using an operational amplifier to amplify the voltage signal output by the sampling circuit, the amplified voltage signal can better highlight the difference of the voltage signal, so that when determining the working state of the image acquisition device according to the voltage signal, a more accurate working state detection result can be obtained, thereby improving the accuracy of the working state detection of the image acquisition device.

[0021] Optionally, the sampling circuit includes a sampling resistor, the sampling resistor is connected in series to a power supply circuit of the image acquisition device, and the sampling resistor is a precision resistor.

[0022] By using a precision resistor as a sampling resistor to sample the voltage of the image acquisition device, a more accurate detection result can be obtained when the working state of the image acquisition device is detected according to the voltage. The sampling circuit has a simple circuit structure and low sampling cost.

[0023] Optionally, the detection circuit of the image acquisition device further includes a memory, and the memory stores a working state detection table;

[0024] The controller is used to obtain a working state detection table from a memory, and obtain a working state detection result of the image acquisition device according to the voltage signal amplified by the amplifier circuit and the working state detection table.

[0025] In an embodiment of the present application, the controller obtains a working status detection table from a memory, and accurately identifies the specific working status and fault type of the image acquisition device according to the working status detection table and the amplified voltage signal, thereby improving the maintenance efficiency when the image acquisition device fails.

[0026] Optionally, a display device is further included, and the display device is connected to the controller;

[0027] The display device is used to receive the working state detection signal generated by the controller, and display the working state detection result of the image acquisition device according to the working state detection signal.

[0028] In the embodiment of the present application, a display device is used to display the working status detection result of the image acquisition device in real time, so that the user can timely understand the current working status of the image acquisition device and perform timely repairs when a failure occurs in the image acquisition device.

[0029] Optionally, it also includes an alarm circuit, which is connected to the controller.

[0030] The alarm circuit is used to issue an abnormality prompt alarm according to the abnormal working signal of the controller.

[0031] In the embodiment of the present application, when the controller detects that the working state detection result of the image acquisition device is an abnormal working state, it generates an abnormal working signal and sends it to the alarm circuit, so that the alarm circuit sends an abnormal prompt alarm according to the abnormal working signal, and promptly reminds the user that the image acquisition device has a fault, which is convenient for the user to replace and repair the image acquisition device in time to avoid further damage to the equipment. At the same time, it can avoid the inability to use the assisted driving function affecting the driving safety of the vehicle.

[0032] In a second aspect, the utility model provides a vehicle, comprising an image acquisition device and a detection circuit of the image acquisition device as described in any one of the above items.

[0033] The present application first uses an electromagnetic interference elimination circuit to eliminate the electromagnetic interference at the signal output end of the image acquisition device, then uses a sampling circuit to acquire the voltage signal of the image acquisition device, and uses an amplifier circuit to amplify the voltage signal. The controller obtains the working status detection result of the image acquisition device according to the amplified voltage signal, thereby improving the accuracy of the detection of the working status of the image acquisition device. At the same time, the detection circuit of the present application is convenient and fast, and the user can promptly repair and replace the image acquisition device in an abnormal working state, thereby improving the user experience.

[0034] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a detection circuit of an image acquisition device in one embodiment of the utility model;

[0036] Figure 2 is a circuit diagram of an electromagnetic interference elimination circuit in one embodiment of the utility model;

[0037] Figure 3 is a circuit diagram of an electromagnetic interference elimination circuit in another embodiment of the utility model;

[0038] Figure 4 is a circuit diagram of an image acquisition device detection device in one embodiment of the utility model;

[0039] Figure 5 It is a structural schematic diagram of a vehicle in one embodiment of the utility model. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. 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 associated listed items.

[0043] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] In addition, in the description of this application, unless otherwise specified, "several" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0045] The image acquisition device of the present application may be a device such as a camera that can be used to acquire images. The present application may be applied in the vehicle field to detect the working status of the vehicle-mounted camera.

[0046] On-board cameras are usually used to realize functions such as reversing images, blind spot monitoring, lane keeping assist, etc., and provide information to the driver by transmitting images or video signals, thereby helping the driver to better adjust the vehicle's driving direction and position.

[0047] However, due to complex vehicle operating conditions and usage environment, vehicle-mounted cameras may face various failure problems. Once the vehicle-mounted camera fails, the user will not be able to use the assisted driving function, affecting the user's driving safety and driving experience.

[0048] In the related art, in order to troubleshoot the malfunction of the vehicle-mounted camera, the user needs to remove the image acquisition device from the vehicle body for further diagnosis and troubleshooting, which requires a lot of manpower and time costs, and the removal process is prone to additional failure risks, resulting in abnormal fault detection results.

[0049] Therefore, in response to the above-mentioned problems, the present invention provides an image acquisition device detection circuit, which eliminates the electromagnetic interference at the signal output end of the image acquisition device by utilizing an electromagnetic interference elimination circuit, and then utilizes a sampling circuit to acquire a voltage signal of the image acquisition device, and utilizes an amplification circuit to amplify the voltage signal. A controller obtains a detection result of the working status of the image acquisition device based on the amplified voltage signal, thereby improving the accuracy of the detection of the working status of the image acquisition device. At the same time, the present application can detect the working status of the image acquisition device in real time, thereby facilitating users to promptly understand whether the image acquisition device is in a normal working state, facilitating users to promptly discover and solve fault problems of the image acquisition device, and improving the user's usage experience.

[0050] like Figure 1 As shown, the detection circuit of the image acquisition device includes: an electromagnetic interference elimination circuit 110, a controller 120, a sampling circuit 130 and an amplification circuit 140;

[0051] The signal output end of the image acquisition device is connected to the input end of the sampling circuit 130 through the electromagnetic interference elimination circuit 110, the output end of the sampling circuit 130 is connected to the input end of the amplifying circuit 140, and the output end of the amplifying circuit 140 is connected to the controller 120;

[0052] The electromagnetic interference elimination circuit 110 is used to eliminate electromagnetic interference at the signal output end of the image acquisition device;

[0053] The sampling circuit 130 is used to collect the voltage signal of the image acquisition device;

[0054] The controller 120 is used to obtain the working state detection result of the image acquisition device according to the voltage signal amplified by the amplifier circuit 140.

[0055] The electromagnetic interference elimination circuit 110 may use EMI filters, decoupling capacitors, etc., which may be used to eliminate electromagnetic interference elements or circuit modules to eliminate electromagnetic interference at the signal output end of the image acquisition device.

[0056] The controller 120 is the control core (Control Unit) of the image acquisition device detection circuit, and is connected to various components of the image acquisition device detection circuit through various interfaces and lines. The controller 120 detects the working status of the image acquisition device by running pre-stored programs or modules.

[0057] The controller 120 can be composed of an integrated circuit, for example, it can be composed of a single packaged integrated circuit, or it can be composed of multiple packaged integrated circuits with the same function or different functions, including one or more central processing units (CPU), microprocessors, digital processing chips, graphics processors and a combination of various control chips.

[0058] The sampling circuit 130 is used to collect a voltage signal of the image acquisition device, and the voltage signal may be a working voltage signal of the image acquisition device when the image acquisition device is working.

[0059] The amplifier circuit 140 is used to amplify the voltage signal collected by the sampling circuit 130, so as to highlight the voltage difference between different voltage signals and facilitate the identification and detection of the working state. The amplifier circuit 140 can use common amplifier elements such as transistors and operational amplifiers to achieve voltage signal amplification.

[0060] The controller 120 can compare the amplified voltage value with the pre-input voltage value, and determine the working state of the image acquisition device according to the comparison result. For example, the amplified voltage value is compared with the normal voltage value. If the voltage value is the same as or close to the normal voltage value, it is determined that the image acquisition device is in a normal working state; wherein the normal voltage value is the voltage value under the normal working state, if the difference between the voltage value and the normal voltage value is greater than the target threshold value, it is determined that the image acquisition device is in an abnormal working state.

[0061] In the embodiment of the present application, the electromagnetic interference at the signal output end of the image acquisition device is first eliminated by using an electromagnetic interference elimination circuit, and then the voltage signal of the image acquisition device is acquired by using a sampling circuit, and the voltage signal is amplified by using an amplifier circuit. The controller obtains the working state detection result of the image acquisition device according to the amplified voltage signal, thereby improving the accuracy of the detection of the working state of the image acquisition device. At the same time, the detection circuit of the present application is convenient and fast, and the user can promptly repair and replace the image acquisition device in an abnormal working state, thereby improving the user experience.

[0062] In one embodiment, the electromagnetic interference elimination circuit 110 includes at least one electromagnetic interference filtering module; a first end of the electromagnetic interference filtering module is connected to a signal output end of an image acquisition device, and a second end of the electromagnetic interference filtering module is connected to an input end of the sampling circuit;

[0063] The electromagnetic interference filtering module includes an inductor and a resistor connected in parallel.

[0064] The number of electromagnetic interference filtering modules can be set according to the actual situation of the image acquisition device.

[0065] See also Figure 2 , which is a circuit diagram of an electromagnetic interference elimination circuit 110 in one embodiment of the present application. The electromagnetic interference elimination circuit 110 of the present application includes two electromagnetic interference filter modules connected in series;

[0066] Specifically, the electromagnetic interference elimination circuit 110 of the present application includes inductors L1-L2 and resistors R6-R7, wherein the inductor L1 and the resistor R7 are connected in parallel as an electromagnetic interference filtering module, and the inductor L2 and the resistor R6 are connected in parallel as an electromagnetic interference filtering module.

[0067] When the frequency of the input signal is low, the impedance of the inductor is high and the effect of the resistor on the current is relatively small, so the total impedance of the circuit is mainly determined by the inductor; when the frequency of the input signal is very high, the impedance of the inductor becomes very small and the effect of the resistor becomes very large, so that the total impedance of the circuit is mainly determined by the resistor. Therefore, in the embodiment of the present application, by using an inductor in parallel with a resistor, the user can adjust the total impedance of the circuit by adjusting the inductor or resistor, thereby eliminating electromagnetic interference caused by sudden voltage or current.

[0068] In the embodiment of the present application, by using parallel inductors and resistors as an electromagnetic interference filtering module, the user can adjust the total impedance of the circuit under high and low frequency conditions by adjusting the inductor or resistor, thereby eliminating electromagnetic interference caused by sudden voltage or current and improving the accuracy of detection of the image acquisition device detection circuit.

[0069] See also Figure 3 In one embodiment, the electromagnetic interference elimination circuit further includes a TVS tube D1; a first end of the TVS tube D1 is connected to a signal output end of the image acquisition device, and a second end of the TVS tube D1 is grounded.

[0070] TVS tube, also known as transient voltage suppression diode, when the two ends of the TVS tube are subjected to a momentary high-energy impact, it can suddenly reduce its impedance at an extremely high speed (up to 1*10^-12 seconds), while absorbing a large current and clamping the voltage between its two ends to a predetermined value, thereby ensuring that the subsequent circuit components are protected from damage by the transient high-energy impact.

[0071] In the embodiment of the present application, a TVS tube is connected to the signal output end of the image acquisition device to prevent damage to the circuit due to static electricity and improve the reliability of the circuit.

[0072] Preferably, the electromagnetic interference elimination circuit further comprises a magnetic bead FB1, and the magnetic bead FB1 is connected in series between the signal output end of the image acquisition device and the electromagnetic interference filtering module.

[0073] The magnetic bead FB1 can be used to filter out high-frequency noise and spike interference on signal lines and power lines, and also has the ability to absorb electrostatic pulses.

[0074] In the embodiment of the present application, by connecting magnetic beads in series between the signal output end of the image acquisition device and the electromagnetic interference filtering module, noise and interference at the signal output end of the image acquisition device are further filtered out, thereby improving the accuracy of the working status detection of the image acquisition device.

[0075] In one embodiment, the image acquisition device detection circuit further includes a memory, wherein the memory stores a working state detection table;

[0076] The controller is used to obtain a working state detection table from a memory, and obtain a working state detection result of the image acquisition device according to the voltage signal amplified by the amplifier circuit and the working state detection table.

[0077] The memory 110 includes a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable programmable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0078] The working status detection table is used to detect the working status of the image acquisition device. In the present application, the working status detection table includes at least one working status and at least one voltage value corresponding to the at least one working status. The working status detection table can be a file pre-stored in the memory 110 by the user.

[0079] The controller 120 can determine the working state corresponding to the amplified voltage signal according to the amplified voltage signal and the working state detection table, and obtain the working state of the image acquisition device.

[0080] In an embodiment of the present application, the working status detection results of the image acquisition device may include open circuit, normal operation, short circuit to ground and short circuit to power supply. The user can quickly locate the cause of the fault of the image acquisition device based on the working status detection results to improve the efficiency of fault repair.

[0081] Please refer to Table 1 below, which is a working status detection table in one embodiment:

[0082] Table 1 Working status detection table

[0083] Voltage value / V 0.707 1.017 1.221 0.498 Working status open circuit Normal operation Short circuit to ground Short circuit to power supply

[0084] In Table 1, each working state corresponds to a voltage value, and the voltage value can be used to determine the working state of the image acquisition device. Specifically, when the voltage value of the voltage signal amplified by the amplifier circuit 140 is 0.707V or close to 0.707V, the working state of the image acquisition device is determined to be open circuit; when the voltage value of the voltage signal amplified by the amplifier circuit 140 is 1.017V or close to 1.017V, the working state of the image acquisition device is determined to be normal operation; when the voltage value of the voltage signal amplified by the amplifier circuit 140 is 1.221V or close to 1.221V, the working state of the image acquisition device is determined to be short circuited to the ground; when the voltage value of the voltage signal amplified by the amplifier circuit 140 is 0.498V or close to 0.498V, the working state of the image acquisition device is determined to be short circuited to the power supply.

[0085] In an embodiment of the present application, the controller obtains a working status detection table from a memory, and accurately identifies the specific working status and fault type of the image acquisition device according to the working status detection table and the amplified voltage signal, thereby improving the maintenance efficiency when the image acquisition device fails.

[0086] The sampling circuit 130 is used to collect the voltage signal of the image acquisition device. The voltage signal collected by the sampling circuit 130 may be the working voltage or the power supply voltage of the image acquisition device.

[0087] The sampling circuit 130 may use an existing voltage sampling circuit to realize the acquisition of voltage signals, or, in one embodiment, the sampling circuit 130 includes a sampling resistor, the sampling resistor is connected in series to the power supply circuit of the image acquisition device, and the sampling resistor is a precision resistor.

[0088] See also Figure 4 In the embodiment of the present application, the sampling resistor R3 can specifically adopt a precision resistor with high accuracy and high reliability. By using the precision resistor as the sampling resistor to sample the voltage of the image acquisition device, when the working state of the image acquisition device is detected according to the voltage, a more accurate detection result can be obtained. The circuit structure of the sampling circuit is simple and the sampling cost is low.

[0089] The power supply circuit of the image acquisition device is used to supply power to the image acquisition device. The power supply circuit may be a circuit formed by a power source and a voltage input terminal of the image acquisition device through a wire.

[0090] like Figure 4 As shown, in one embodiment, the amplifier circuit 140 includes a first resistor R2, a second resistor R1, a third resistor R4, a fourth resistor R5 and an operational amplifier U2;

[0091] The positive input terminal of the operational amplifier U2 is respectively connected to the second end of the first resistor R2 and the second end of the second resistor R1, the first end of the first resistor R2 is connected to the first output end of the sampling circuit, the first end of the second resistor R1 is grounded, the negative input terminal of the operational amplifier U2 is respectively connected to the second end of the third resistor R4 and the first end of the fourth resistor R5, the first end of the third resistor R4 is connected to the second output end of the sampling circuit, the second end of the fourth resistor R5 is connected to the output terminal of the operational amplifier U2, and the output terminal of the operational amplifier U2 is connected to the controller 120.

[0092] In the embodiment of the present application, by using an operational amplifier to amplify the voltage signal output by the sampling circuit, the amplified voltage signal can better highlight the difference of the voltage signal, so that when determining the working state of the image acquisition device based on the voltage signal, a more accurate working state detection result can be obtained, thereby improving the accuracy of the working state detection of the image acquisition device.

[0093] In one embodiment, the image acquisition device detection circuit further includes a display device, and the display device is connected to the controller 120;

[0094] The display device is used to receive the working status detection signal generated by the controller 120, and display the working status detection result of the image acquisition device according to the working status detection signal.

[0095] The controller 120 is used to obtain a working state detection table from the memory 110, generate a working state detection signal according to the voltage signal and the working state detection table, and send the signal to the display device;

[0096] The display device is used to display the working status of the image acquisition device in real time. The display device can be a display screen or other device with display function.

[0097] The working state detection signal can be used to control the display device to display the working state detection result of the image acquisition device. The working state detection signal can include whether the image acquisition device has a fault and the cause of the fault when a fault occurs.

[0098] In the embodiment of the present application, a display device is used to display the working status detection result of the image acquisition device in real time, so that the user can timely understand the current working status of the image acquisition device and perform timely repairs when a failure occurs in the image acquisition device.

[0099] In one embodiment, the image acquisition device detection circuit further includes an alarm circuit, and the alarm circuit is connected to the controller.

[0100] The alarm circuit is used to issue an abnormality prompt alarm according to the abnormal working signal of the controller.

[0101] The abnormal working signal can be a signal generated by the controller when it detects that the working state of the image acquisition device is an abnormal working state (such as short circuit to ground, short circuit to power supply or open circuit, etc.). The abnormal working signal is used to control the alarm circuit to issue an abnormal prompt alarm.

[0102] The alarm circuit may include an indicator light and a buzzer. When the alarm circuit includes an indicator light, an abnormality warning alarm may be issued by controlling the light state of the indicator light, such as continuously flashing for a target time or keeping it always on; when the alarm circuit includes a buzzer, an abnormality warning alarm may be issued by controlling the buzzer to emit a specified sound, such as continuously emitting a "beeping" sound.

[0103] In the embodiment of the present application, when the controller detects that the working state detection result of the image acquisition device is an abnormal working state, it generates an abnormal working signal and sends it to the alarm circuit, so that the alarm circuit sends an abnormal prompt alarm according to the abnormal working signal, and promptly reminds the user that the image acquisition device has a fault, which is convenient for the user to replace and repair the image acquisition device in time to avoid further damage to the equipment. At the same time, it can avoid the inability to use the assisted driving function affecting the driving safety of the vehicle.

[0104] like Figure 5 As shown, the present application also provides a vehicle 200, including an image acquisition device 210 and an image acquisition device detection circuit 220 as described in any one of the above items.

[0105] The image acquisition device 210 may be a vehicle-mounted camera.

[0106] The present application can improve the stability and reliability of the image acquisition device, ensure its normal operation to provide accurate images and video signals, detect and display the working status of the image acquisition device in real time, and promptly issue an alarm for abnormal working status, thereby facilitating users to carry out repairs in a timely manner, improving the operating stability and reliability of the vehicle's assisted driving function, providing drivers with a better driving experience, and improving driving safety; the present application does not require frequent disassembly of the image acquisition device and the use of professional tools, thereby reducing the difficulty and cost of troubleshooting the image acquisition device and improving maintenance efficiency.

[0107] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the claims of the present invention and the scope of equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A detection circuit for an image acquisition device, characterized in that: include: An electromagnetic interference elimination circuit, a controller, a sampling circuit and an amplifying circuit; the signal output end of the image acquisition device is connected to the input end of the sampling circuit through the electromagnetic interference elimination circuit, the output end of the sampling circuit is connected to the input end of the amplifying circuit, and the output end of the amplifying circuit is connected to the controller; The electromagnetic interference elimination circuit is used to eliminate electromagnetic interference at the signal output end of the image acquisition device; The sampling circuit is used to collect the voltage signal of the image acquisition device; The controller is used to obtain the working state detection result of the image acquisition device according to the voltage signal amplified by the amplifier circuit.

2. The image acquisition device detection circuit according to claim 1, characterized in that: The electromagnetic interference elimination circuit includes at least one electromagnetic interference filtering module; a first end of the electromagnetic interference filtering module is connected to a signal output end of an image acquisition device, and a second end of the electromagnetic interference filtering module is connected to an input end of the sampling circuit; The electromagnetic interference filtering module includes an inductor and a resistor connected in parallel.

3. The image acquisition device detection circuit according to claim 2, characterized in that: The electromagnetic interference elimination circuit also includes a TVS tube; a first end of the TVS tube is connected to the signal output end of the image acquisition device, and a second end of the TVS tube is grounded.

4. The image acquisition device detection circuit according to claim 2, characterized in that: It also includes magnetic beads, which are connected in series between the signal output end of the image acquisition device and the electromagnetic interference filtering module.

5. The image acquisition device detection circuit according to claim 1, characterized in that: The amplifying circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and an operational amplifier; The positive input terminal of the operational amplifier is connected to the second end of the first resistor and the second end of the second resistor respectively, the first end of the first resistor is connected to the first output terminal of the sampling circuit, and the first end of the second resistor is grounded. The negative input terminal of the operational amplifier is connected to the second end of the third resistor and the first end of the fourth resistor respectively, the first end of the third resistor is connected to the second output terminal of the sampling circuit, and the second end of the fourth resistor is connected to the output terminal of the operational amplifier; The output end of the operational amplifier is connected to the controller.

6. The image acquisition device detection circuit according to claim 1, characterized in that: The sampling circuit comprises a sampling resistor, and the sampling resistor is connected in series in the power supply circuit of the image acquisition device; the sampling resistor is a precision resistor.

7. The image acquisition device detection circuit according to claim 1, characterized in that: The image acquisition device detection circuit further includes a memory, wherein the memory stores a working state detection table; the working state detection table includes at least one working state and at least one voltage value corresponding to the at least one working state; The controller is used to obtain a working state detection table from a memory, and obtain a working state detection result of the image acquisition device according to the voltage signal amplified by the amplifier circuit and the working state detection table.

8. The image acquisition device detection circuit according to any one of claims 1 to 7, characterized in that: Also included is a display device, the display device is connected to the controller; The display device is used to receive the working state detection signal generated by the controller, and display the working state detection result of the image acquisition device according to the working state detection signal.

9. The image acquisition device detection circuit according to any one of claims 1 to 7, characterized in that: It also includes an alarm circuit, which is connected to the controller. The alarm circuit is used to issue an abnormality prompt alarm according to the abnormal working signal of the controller.

10. A vehicle, characterized in that: It comprises an image acquisition device and an image acquisition device detection circuit as described in any one of claims 1 to 9.

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