Sampling verification circuit, sampling verification method of sampling circuit and vehicle

Abstract

The invention provides a sampling verification circuit, a sampling verification method of a sampling circuit and a vehicle. The sampling verification circuit comprises an input end, a voltage division circuit, a switching unit and a control unit, wherein the input end is connected to a power supply for providing reference voltage of the sampling circuit; the voltage division circuit is connected to the input end and is used for dividing the reference voltage; the switching unit is connected to the voltage division circuit, and the switching unit is used for changing the connection state of the voltage division circuit; the control unit is connected to the switching unit and the voltage division circuit, and the control unit is used for controlling the switching unit to act, collecting verification voltages of the voltage division circuit in different connection states, and comparing the verification voltages with preselected and stored standard voltages so as to verify the reference voltage. The sampling circuit is verified through the sampling verification circuit, and whether the sampling result of the sampling circuit is correct or not can be judged, so that the reliability of analog sampling of the controller is improved, and the accuracy of system control is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit verification, and in particular relates to a sampling verification circuit, a sampling verification method of a sampling circuit, and a vehicle. Background Art

[0002] At present, with the continuous development of the electronic and electrical architecture of electric vehicles, more and more regional / functional domain controllers are applied to vehicles, and each domain controller integrates a large number of ADC (Analog-to-Digital Converter) sampling circuits, such as temperature sampling, voltage sampling, current sampling, etc. These controllers generally lack a circuit that can verify the sampling results. When the reference voltage deviates or is wrong, the ADC sampling results will also be wrong or deviated, and the controller cannot accurately determine whether the result is correct, so it cannot execute the control command, resulting in control system failure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a sampling verification circuit, a sampling verification method for a sampling circuit and a vehicle, by which the sampling circuit is verified, and whether the sampling result of the sampling circuit is correct can be determined, thereby improving the reliability of the analog sampling of the controller and improving the accuracy of system control.

[0004] In order to solve or improve the above technical problems to a certain extent, according to one aspect of the present invention, a sampling verification circuit is provided for verifying a sampling circuit, the sampling verification circuit comprising: an input terminal, a voltage dividing circuit, a switching unit and a control unit;

[0005] Wherein, the input end is connected to a power supply that provides a reference voltage for the sampling circuit;

[0006] The voltage divider circuit is connected to the input end, and the voltage divider circuit is used to divide the reference voltage;

[0007] The switching unit is connected to the voltage dividing circuit, and the switching unit is used to change the connection state of the voltage dividing circuit;

[0008] The control unit is connected to the switching unit and the voltage divider circuit. The control unit is used to control the action of the switching unit, collect the verification voltage of the voltage divider circuit in different connection states, and compare the verification voltage with a pre-selected and stored standard voltage to verify the reference voltage.

[0009] In some embodiments, the voltage divider circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;

[0010] Wherein, the first end of the first resistor is connected to the power supply, the first ends of the second resistor, the third resistor and the fifth resistor are all connected to the second end of the first resistor, the first end of the fourth resistor is connected to the second end of the fifth resistor, and the second end of the fourth resistor is connected to the ground;

[0011] The switching unit includes a first switch and a second switch;

[0012] The first switch is connected to the second end of the second resistor and the ground end respectively, and the second switch is connected to the second end of the third switch and the ground end respectively.

[0013] In some embodiments, the control unit is connected to the first switch and the second switch to control the on and off of the first switch and the second switch;

[0014] The control unit is connected to a first sampling point and a second sampling point of the voltage divider circuit to collect the verification voltages at the first sampling point and the second sampling point, wherein the first sampling point is located at the second end of the first resistor, and the second sampling point is located at the second end of the fifth resistor.

[0015] In some embodiments, the control unit stores multiple sets of standard voltages of the first sampling point and the second sampling point, and the multiple sets of standard voltages correspond to different on-off states of the first switch and the second switch respectively;

[0016] The control unit is configured to control the on-off state of the first switch and the second switch, and collect voltage values ​​of the first sampling point and the second sampling point when the first switch and the second switch are in different on-off states to obtain multiple groups of verification voltages, and compare the verification voltages and the standard voltages corresponding to the same on-off state in the multiple groups of verification voltages and the multiple groups of standard voltages to obtain a verification result.

[0017] In some embodiments, the control unit is configured to determine that the sampling circuit is faulty when at least one of the multiple groups of verification voltages is different from the standard voltage corresponding to the same on-off state.

[0018] In some implementations, the first switch and the second switch are MOS transistors or triodes.

[0019] In some embodiments, the control unit is configured to periodically check the reference voltage.

[0020] In some implementations, the control unit is configured to report the verification result when the verification result indicates that the sampling circuit is faulty.

[0021] According to an embodiment of the present invention, a sampling verification method of a sampling circuit is provided, characterized in that it is applied to the sampling verification circuit described in any of the above embodiments, and the method includes:

[0022] Controlling the switching unit to change the connection state of the voltage divider circuit;

[0023] Collecting multiple groups of voltage values ​​of the voltage divider circuit in different connection states to obtain multiple groups of verification voltages;

[0024] The verification voltage is compared with a pre-stored standard voltage to verify the sampling circuit according to the comparison result.

[0025] According to an embodiment of the present invention, a controller is provided, which includes a memory and a processor, wherein the memory stores a computer program, and when the program is executed by the processor, the steps of the sampling and verification method of the sampling circuit described in any of the above embodiments can be implemented.

[0026] According to an embodiment of the present invention, a computer-readable storage medium is provided for storing a computer program, wherein when the program is executed by a computer or a processor, the steps of the sampling and verification method of the sampling circuit described in any of the above embodiments are implemented.

[0027] According to an embodiment of the present invention, a vehicle is provided, which includes the sampling and verification circuit described in any one of the above embodiments.

[0028] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the sampling and verification circuit, the sampling and verification method of the sampling circuit and the vehicle of the present invention can achieve considerable technical progress and practicality, and have wide industrial utilization value, and have at least the following advantages:

[0029] The present invention verifies the accuracy of the sampling results of the sampling circuit through a simple, low-cost and reliable sampling verification circuit, effectively improving the credibility of the analog sampling of the controller, improving the accuracy of system control, and avoiding the situation where the controller cannot accurately judge whether the result is correct and cannot execute the control instruction, resulting in control system failure.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1A topological diagram of a sampling and checking circuit according to an embodiment of the present invention;

[0032] Figure 2 The figure is a flow chart of a sampling and verification method of a sampling circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the sampling and verification circuit, the sampling and verification method of the sampling circuit and the specific implementation mode and effects of the vehicle proposed in the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0034] According to an embodiment of the present invention, a sampling verification circuit is provided, which is used to verify a reference voltage of a sampling circuit. Optionally, the sampling circuit is an ADC (Analog-to-Digital Converter) sampling circuit.

[0035] like Figure 1 As shown, the sampling and verification circuit includes: an input terminal 10, a voltage dividing circuit 20, a switching unit 30 and a control unit 40.

[0036] The input terminal 10 is connected to a power supply, and the power supply is used to provide a reference voltage Vref for the sampling circuit. That is, the input terminal 10 inputs the reference voltage Vref of the sampling circuit to be verified.

[0037] The voltage divider circuit 20 is connected to the input terminal 10 to divide the reference voltage Vref input through the input terminal 10. A plurality of sampling points are provided on the voltage divider circuit 20 to collect the calibration voltage through the plurality of sampling points. The switching unit 30 is connected to the voltage divider circuit 20 to change the connection state of the voltage divider circuit 20, thereby changing the voltage values ​​of the plurality of sampling points of the voltage divider circuit 20.

[0038] In one embodiment, if Figure 1 As shown, the voltage divider circuit 20 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5.

[0039] Among them, the first end of the first resistor R1 is connected to the power supply, the first ends of the second resistor R2, the third resistor R3 and the fifth resistor R5 are all connected to the second end of the first resistor R1, the first end of the fourth resistor R4 is connected to the second end of the fifth resistor R5, and the second end of the fourth resistor R4 is connected to the ground terminal GND.

[0040] The switching unit 30 includes a first switch Q1 and a second switch Q2, wherein the first switch Q1 is connected to the second end of the second resistor R2 and the ground GND respectively, and the second switch Q2 is connected to the second end of the third switch and the ground GND respectively.

[0041] In this embodiment, the control unit 40 is connected to the first switch Q1 and the second switch Q2 to control the on and off of the first switch Q1 and the second switch Q2.

[0042] Optionally, the first switch Q1 and the second switch Q2 are MOS tubes (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), wherein the source and drain of the first switch Q1 are connected to the second end of the second resistor R2 and the ground terminal GND, and the gate of the first switch Q1 is connected to the control unit 40. The source and drain of the second switch Q2 are connected to the second end of the third resistor R3 and the ground terminal GND, and the gate of the second switch Q2 is connected to the control unit 40.

[0043] Optionally, the first switch Q1 and the second switch Q2 are triodes, wherein the emitter and collector of the first switch Q1 are connected to the second end of the second resistor R2 and the ground GND, and the base of the first switch Q1 is connected to the control unit 40. The emitter and collector of the second switch Q2 are connected to the second end of the third resistor R3 and the ground GND, and the base of the second switch Q2 is connected to the control unit 40.

[0044] In this embodiment, if Figure 1 As shown, the control unit 40 is connected to the first sampling point C1 and the second sampling point C2 of the voltage divider circuit 20 to collect the verification voltages at the first sampling point C1 and the second sampling point C2.

[0045] The first sampling point C1 is located at the second end of the first resistor R1, and the second sampling point C2 is located at the second end of the fifth resistor R5. Specifically, the first sampling point C1 is located at the connection point between the first resistor R1 and the second resistor R2, the third resistor R3 and the fifth resistor R5; the second sampling point C2 is located at the connection point between the fifth resistor R5 and the fourth resistor R4.

[0046] The control unit 40 is configured to control the on-off state of the first switch Q1 and the second switch Q2, and collect voltage values ​​at the first sampling point C1 and the second sampling point C2 when the first switch Q1 and the second switch Q2 are in different on-off states, so as to obtain multiple groups of verification voltages, and compare the verification voltages and the standard voltages corresponding to the same on-off state in the multiple groups of verification voltages and the multiple groups of standard voltages, respectively, to obtain a verification result.

[0047] Specifically, the on-off states of the first switch Q1 and the second switch Q2 include: both the first switch Q1 and the second switch Q2 are off, the first switch Q1 is off and the second switch Q2 is on, the first switch Q1 and the second switch Q2 are on, and the first switch Q1 is on and the second switch Q2 is off.

[0048] Multiple sets of standard voltages of the first switch Q1 and the second switch Q2 in different on-off states are pre-stored in the control unit 40. The multiple sets of standard voltages are obtained by theoretical calculation. The corresponding relationship between the standard voltages of the first sampling point C1 and the second sampling point C2 when the first switch Q1 and the second switch Q2 are in different on-off states is shown in Table 1:

[0049] Table 1

[0050]

[0051] In the above table, Vref is the reference voltage of the sampling circuit, R1-R5 are the resistance values ​​of the first resistor R1 to the fifth resistor R5, Rdosn1 is the resistance value when the first switch Q1 is turned on, and Rdson2 is the resistance value when the second switch Q2 is turned on.

[0052] In the process of verifying the sampling circuit, the control unit 40 controls the first switch Q1 and the second switch Q2 to switch between the four different on-off states as described above, and collects the sampling voltages of the first sampling point C1 and the second sampling point C2 in each on-off state, to obtain multiple groups of verification voltages corresponding to the different on-off states of the first switch Q1 and the second switch Q2.

[0053] In this embodiment, after the control unit 40 obtains multiple groups of verification voltages, they are compared with multiple groups of standard voltages pre-stored in the control unit 40 , and the comparison result is the verification result of the sampling circuit.

[0054] When comparing the multiple groups of verification voltages with the multiple groups of standard voltages, the verification voltages corresponding to the same on-off states of the first switch Q1 and the second switch Q2 in the multiple groups of verification voltages and the multiple groups of standard voltages are respectively compared with the standard voltages. That is, the verification voltage corresponding to each group of on-off states in the multiple groups of on-off states of the first switch Q1 and the second switch Q2 is respectively compared with the standard voltage to obtain multiple groups of comparison results.

[0055] In one embodiment, when at least one comparison result among the multiple comparison results of the verification voltage and the standard voltage is different, it is determined that the sampling circuit is faulty.

[0056] Specifically, when at least one set of comparison results between the verification voltage and the standard voltage is different from the standard voltage corresponding to the on-off state of the same set of first switch Q1 and second switch Q2, it is determined that the verification circuit fails.

[0057] In one embodiment, the control unit 40 is configured to periodically verify the reference voltage Vref. Specifically, the control unit 40 may be configured in advance to control the on / off state of the first switch Q1 and the second switch Q2 to change at every preset time interval, and synchronously collect the verification voltages at the first sampling point C1 and the second sampling point C2 in different on / off states, and verify the collected verification voltages.

[0058] In this embodiment, by configuring the control unit 40 to periodically check the sampling circuit, on the one hand, a fault in the sampling circuit can be discovered in time, and on the other hand, the number of calculations of the control unit 40 can be reduced to save energy consumption for checking the sampling circuit.

[0059] In one embodiment, when the control unit 40 determines that the sampling circuit is faulty by comparing the verification voltage with the standard voltage, the control unit 40 reports the verification result, for example, by uploading the verification result to the vehicle's controller, or uploading the verification result to a server, etc., so that the vehicle can make corresponding processing according to the verification result.

[0060] In one embodiment, the control unit 40 is a microcontroller unit (MCU).

[0061] According to another embodiment of the present invention, a sampling verification method of a sampling circuit is provided, which is applied to the sampling verification circuit described in any one of the above embodiments.

[0062] like Figure 2 As shown, the sampling verification method of the sampling circuit includes:

[0063] Step S10 , controlling the switching unit 30 to operate to change the connection state of the voltage dividing circuit 20 .

[0064] In this step, the input terminal 10 of the sampling verification circuit used in the sampling verification method of the sampling circuit is connected to a power supply, and the power supply is used to provide a reference voltage Vref of the sampling circuit. That is, the input terminal 10 inputs the reference voltage Vref of the sampling circuit to be detected.

[0065] The voltage divider circuit 20 is connected to the input terminal 10 to divide the reference voltage Vref input through the input terminal 10. A plurality of sampling points are provided on the voltage divider circuit 20 to collect the calibration voltage through the plurality of sampling points. The switching unit 30 is connected to the voltage divider circuit 20, and the switching unit 30 is controlled to change the connection state of the voltage divider circuit 20, thereby changing the voltage values ​​of the plurality of sampling points of the voltage divider circuit 20.

[0066] In one embodiment, if Figure 1As shown, the voltage divider circuit 20 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5.

[0067] Among them, the first end of the first resistor R1 is connected to the power supply, the first ends of the second resistor R2, the third resistor R3 and the fifth resistor R5 are all connected to the second end of the first resistor R1, the first end of the fourth resistor R4 is connected to the second end of the fifth resistor R5, and the second end of the fourth resistor R4 is connected to the ground terminal GND.

[0068] The switching unit 30 includes a first switch Q1 and a second switch Q2, wherein the first switch Q1 is connected to the second end of the second resistor R2 and the ground GND respectively, and the second switch Q2 is connected to the second end of the third switch and the ground GND respectively.

[0069] Optionally, the first switch Q1 and the second switch Q2 are MOS tubes (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), wherein the source and drain of the first switch Q1 are connected to the second end of the second resistor R2 and the ground terminal GND, and the gate of the first switch Q1 is used to receive a control instruction. The source and drain of the second switch Q2 are connected to the second end of the third resistor R3 and the ground terminal GND, and the gate of the second switch Q2 is used to receive a control instruction.

[0070] Optionally, the first switch Q1 and the second switch Q2 are triodes, wherein the emitter and collector of the first switch Q1 are connected to the second end of the second resistor R2 and the ground terminal GND, and the base of the first switch Q1 is used to receive a control instruction. The emitter and collector of the second switch Q2 are connected to the second end of the third resistor R3 and the ground terminal GND, and the base of the second switch Q2 is used to receive a control instruction.

[0071] Step S20 , collecting multiple groups of voltage values ​​of the voltage divider circuit 20 in different connection states to obtain multiple groups of verification voltages.

[0072] In this step, the voltage values ​​of the first sampling point C1 and the second sampling point C2 of the voltage divider circuit 20 are collected to obtain the verification voltages of the first sampling point C1 and the second sampling point C2.

[0073] The first sampling point C1 is located at the second end of the first resistor R1, and the second sampling point C2 is located at the second end of the fifth resistor R5. Specifically, the first sampling point C1 is located at the connection point between the first resistor R1 and the second resistor R2, the third resistor R3 and the fifth resistor R5; the second sampling point C2 is located at the connection point between the fifth resistor R5 and the fourth resistor R4.

[0074] During the verification voltage collection process, the on / off states of the first switch Q1 and the second switch Q2 are controlled to change, and the voltage values ​​of the first sampling point C1 and the second sampling point C2 when the first switch Q1 and the second switch Q2 are in different on / off states are collected to obtain multiple sets of verification voltages.

[0075] Specifically, the on-off states of the first switch Q1 and the second switch Q2 include: both the first switch Q1 and the second switch Q2 are off, the first switch Q1 is off and the second switch Q2 is on, the first switch Q1 and the second switch Q2 are on, and the first switch Q1 is on and the second switch Q2 is off.

[0076] Step S30, comparing the verification voltage with a pre-stored standard voltage to verify the sampling circuit according to the comparison result.

[0077] In this step, the verification voltages and the standard voltages corresponding to the same on-off state in the collected multiple groups of verification voltages and multiple groups of standard voltages are compared to obtain a verification result.

[0078] The plurality of sets of standard voltages are pre-stored standard voltages corresponding to the first switch Q1 and the second switch Q2 in different on-off states. The plurality of sets of standard voltages are obtained by theoretical calculation. The corresponding relationship between the first switch Q1 and the second switch Q2 in different on-off states and the standard voltages at the first sampling point C1 and the second sampling point C2 is shown in Table 1 above.

[0079] In the process of verifying the sampling circuit, the first switch Q1 and the second switch Q2 are controlled to switch between the four different on-off states as described above, and the sampling voltages of the first sampling point C1 and the second sampling point C2 in each on-off state are collected to obtain multiple groups of verification voltages corresponding to the on-off states of the first switch Q1 and the second switch Q2.

[0080] In this embodiment, after a plurality of groups of verification voltages are obtained, they are compared with a plurality of groups of pre-stored standard voltages, and the comparison result is the verification result of the sampling circuit.

[0081] When comparing the multiple groups of verification voltages with the multiple groups of standard voltages, the verification voltages corresponding to the same on-off states of the first switch Q1 and the second switch Q2 in the multiple groups of verification voltages and the multiple groups of standard voltages are compared with the standard voltages, that is, the verification voltage corresponding to each on-off state in the multiple groups of on-off states of the first switch Q1 and the second switch Q2 is compared with the standard voltage, respectively, to obtain multiple groups of comparison results.

[0082] In one embodiment, the sampling verification method of the sampling circuit further includes: when at least one set of comparison results among the multiple sets of comparison results between the verification voltage and the standard voltage is different, determining that the sampling circuit is faulty.

[0083] Specifically, when at least one set of comparison results between the verification voltage and the standard voltage is different from the standard voltage corresponding to the on-off state of the same set of first switch Q1 and second switch Q2, it is determined that the verification circuit fails.

[0084] In one embodiment, the sampling verification method of the sampling circuit further includes: periodically verifying the reference voltage Vref.

[0085] Specifically, the on-off states of the first switch Q1 and the second switch Q2 are controlled at preset time intervals, and the verification voltages at the first sampling point C1 and the second sampling point C2 in different on-off states are synchronously collected, and the collected verification voltages are verified.

[0086] In this embodiment, by periodically verifying the sampling circuit, on the one hand, a fault in the sampling circuit can be discovered in time, and on the other hand, the calculation process of the sampling verification can be reduced to save energy consumption for verifying the sampling circuit.

[0087] In one embodiment, the sampling verification method of the sampling circuit also includes: when the sampling circuit is determined to be faulty by comparing the verification voltage with the standard voltage, reporting the verification result, for example, uploading the verification result to the vehicle controller, or uploading the verification result to the server, etc., so that the vehicle can make corresponding processing according to the verification result.

[0088] According to another embodiment of the present invention, a controller is provided, which includes a memory and a processor, wherein the memory stores a computer program, and when the program is executed by the processor, the steps of the application program testing method in any of the above-mentioned embodiments can be implemented.

[0089] According to another embodiment of the present invention, a readable storage medium is provided for storing a computer program, wherein the program, when executed by a computer or a processor, implements the steps of the application program testing method in any of the above-mentioned embodiments.

[0090] According to another embodiment of the present invention, a vehicle is provided, comprising the sampling and verification circuit described in any one of the above embodiments.

[0091] The present invention verifies the accuracy of the sampling results of the sampling circuit through a simple, low-cost and reliable sampling verification circuit, effectively improving the credibility of the analog sampling of the controller, improving the accuracy of system control, and avoiding the situation where the controller cannot accurately judge whether the result is correct and cannot execute the control instruction, resulting in control system failure.

[0092] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A sampling and verification circuit, characterized in that: Used to verify the sampling circuit, the sampling verification circuit includes: an input end, a voltage dividing circuit, a switching unit and a control unit; Wherein, the input end is connected to a power supply that provides a reference voltage for the sampling circuit; The voltage divider circuit is connected to the input end, and the voltage divider circuit is used to divide the reference voltage; The switching unit is connected to the voltage dividing circuit, and the switching unit is used to change the connection state of the voltage dividing circuit; The control unit is connected to the switching unit and the voltage divider circuit. The control unit is used to control the action of the switching unit, collect the verification voltage of the voltage divider circuit in different connection states, and compare the verification voltage with a pre-selected and stored standard voltage to verify the reference voltage.

2. The sampling and verification circuit according to claim 1, characterized in that: The voltage divider circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor; Wherein, the first end of the first resistor is connected to the power supply, the first ends of the second resistor, the third resistor and the fifth resistor are all connected to the second end of the first resistor, the first end of the fourth resistor is connected to the second end of the fifth resistor, and the second end of the fourth resistor is connected to the ground; The switching unit includes a first switch and a second switch; The first switch is connected to the second end of the second resistor and the ground end respectively, and the second switch is connected to the second end of the third switch and the ground end respectively.

3. The sampling and verification circuit according to claim 2, characterized in that: The control unit is connected to the first switch and the second switch to control the on and off of the first switch and the second switch; The control unit is connected to a first sampling point and a second sampling point of the voltage divider circuit to collect the verification voltages at the first sampling point and the second sampling point, wherein the first sampling point is located at the second end of the first resistor, and the second sampling point is located at the second end of the fifth resistor.

4. The sampling and verification circuit according to claim 3, characterized in that: The control unit stores a plurality of groups of standard voltages of the first sampling point and the second sampling point, wherein the plurality of groups of standard voltages correspond to different on-off states of the first switch and the second switch respectively; The control unit is configured to control the on-off state of the first switch and the second switch, and collect voltage values ​​of the first sampling point and the second sampling point when the first switch and the second switch are in different on-off states to obtain multiple groups of verification voltages, and compare the verification voltages and the standard voltages corresponding to the same on-off state in the multiple groups of verification voltages and the multiple groups of standard voltages to obtain a verification result.

5. The sampling and verification circuit according to claim 4, characterized in that: The control unit is configured to determine that the sampling circuit is faulty when at least one of the multiple groups of verification voltages is different from the standard voltage corresponding to the same on-off state.

6. The sampling and verification circuit according to any one of claims 2 to 5, characterized in that: The first switch and the second switch are MOS tubes or triodes.

7. The sampling and verification circuit according to claim 1, characterized in that: The control unit is configured to periodically check the reference voltage.

8. The sampling and verification circuit according to claim 1, characterized in that: The control unit is configured to report the verification result when the verification result is that the sampling circuit is faulty.

9. A sampling verification method for a sampling circuit, characterized in that: The sampling and verification circuit applied to any one of claims 1 to 8, the method comprising: Controlling the switching unit to change the connection state of the voltage divider circuit; Collecting multiple groups of voltage values ​​of the voltage divider circuit in different connection states to obtain multiple groups of verification voltages; The verification voltage is compared with a pre-stored standard voltage to verify the sampling circuit according to the comparison result.

10. A vehicle comprising a sampling circuit, characterized in that: It also includes the sampling and verification circuit according to any one of claims 1-8.

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