Automobile control module testing device

Abstract

The utility model discloses an automobile control module testing device, comprising a housing, the housing is provided with an equipment interface, a button and a display screen, the housing is internally provided with a circuit board, the circuit board comprises a master control module, a power supply module, a power supply control module, a vehicle communication module and a detection module, the equipment interface is used for connecting with an automobile control module to be detected, and the button is used for connecting with the display screen. The power supply control module is used for switching on or switching off power supply of the power supply module to the to-be-detected automobile control module according to a power supply control signal of the main control module, and the vehicle communication module is used for converting and adapting received and transmitted signals between the main control module and the to-be-detected automobile control module. The detection module is used for detecting the working voltage and current of the to-be-detected automobile control module. According to the utility model, the function state of the automobile control module can be detected under the condition that the automobile control module is not installed back to the automobile, the type and the model of the module to be detected can be matched through one-time key pressing, and the maintenance efficiency is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the field of automobile equipment detection, and particularly relates to a test device for an automobile control module. Background Art

[0002] After repair or replacement of an automobile control module such as a gear shift module (GSM), an electronic shift module (ESM), an automobile steering angle sensor (SAS), etc., it is necessary to detect its basic functions.

[0003] The current detection method is to reinstall each automobile control module into the vehicle, and access the original or third-party diagnostic tool through the vehicle's OBD (On-Board Diagnostics) port to test and verify the repaired module. Since it cannot be guaranteed that the function of the repaired or replaced automobile control module is normal, during the repair and detection process, situations such as inability to operate after installation and repeated disassembly will occur, affecting the repair efficiency and success rate. In addition, when using the OBD diagnostic tool, the operator needs to manually select and match the parts to be repaired from many manufacturers, vehicle models and accessories, which is time-consuming and affects the repair efficiency.

[0004] In view of this, it is necessary to propose a new test device for an automobile control module to solve the above problems. Summary of the Utility Model

[0005] To solve the problems commonly existing in the prior art, the utility model proposes a test device for an automobile control module, which is directly connected to the automobile control module to be tested through a connecting wire, and can detect the functional state of the automobile control module without installing the automobile control module back into the vehicle.

[0006] The technical solution adopted by the utility model is as follows:

[0007] The present utility model provides a test device for an automotive control module, which includes a housing. The housing is provided with a device interface, a button, and a display screen. A circuit board is disposed inside the housing. The circuit board includes a main control module, a power supply module, a power supply control module, a vehicle communication module, and a detection module. The device interface is used to connect the automotive control module to be detected. The power supply module is used to supply power to the test device for the automotive control module and the automotive control module to be detected. The power supply control module is respectively connected to the device interface, the main control module, and the power supply module, and is used to turn on or off the power supply of the power supply module to the automotive control module to be detected according to the power control signal of the main control module. The vehicle communication module is connected between the device interface and the main control module, and is used to convert and adapt the signals transmitted and received between the main control module and the automotive control module to be detected. The detection module is connected between the device interface and the main control module, and is used to detect the working voltage and current of the automotive control module to be detected and send them to the main control module. The button is connected to the main control module and is used to receive user operations. The display screen is connected to the main control module and is used to display the working voltage and current of the automotive control module to be detected.

[0008] Further, the housing is provided with a power supply interface for connecting an external DC power supply. The power supply module includes an input protection unit, a first voltage conversion unit, and a second voltage conversion unit. The external DC power supply passes through the input protection unit to obtain a first power supply. The first power supply passes through the first voltage conversion unit to obtain a second power supply. The second power supply passes through the second voltage conversion unit to obtain a third power supply. The input protection unit includes a fuse and a Schottky diode. The first voltage conversion unit includes a first voltage conversion chip. The second voltage conversion unit includes a second voltage conversion chip.

[0009] Further, the power supply control module includes a first switching tube, a second switching tube, a first resistor, a second resistor, a third resistor, and a fourth resistor. The first switching tube is an NPN tube. The second switching tube is a PMOS tube. The base of the first switching tube is connected to the power control terminal of the main control module through the first resistor, the emitter is grounded, and the collector is connected to the gate of the second switching tube through the third resistor. A second resistor is connected in parallel between the emitter and the collector. The source of the second switching tube is connected to the first power supply. A fourth resistor is connected in parallel between the gate and the drain. The drain is connected to the power supply pin of the device interface.

[0010] Further, the vehicle communication module includes a CAN bus communication unit and a LIN bus communication unit.

[0011] Further, the CAN bus communication unit includes a CAN communication conversion chip and an ESD protection diode. The signal sending end of the CAN communication conversion chip is connected to the CAN signal sending end of the main control module, the receiving end is connected to the CAN signal receiving end of the main control module, the high CAN signal end is connected to the high CAN signal end of the device interface, and the low CAN signal end is connected to the low CAN signal end of the device interface. The first end of the ESD protection diode is connected to the high CAN signal end of the CAN communication conversion chip, the second end of the ESD protection diode is connected to the high CAN signal end of the CAN communication conversion chip, and the third end of the ESD protection diode is grounded.

[0012] Further, the LIN bus communication unit includes a third switching transistor, a fourth switching transistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor. The third switching transistor is an NPN transistor, and the fourth switching transistor is a PNP transistor. The emitter of the third switching transistor is grounded, the base is connected to the LIN signal sending end of the main control module via the seventh resistor, the collector is connected to the LIN bus signal end of the device interface, the collector is connected to the first power supply via the fifth resistor, and the collector is also connected to the base of the fourth switching transistor via the sixth resistor. The collector of the fourth switching transistor is grounded, the emitter is connected to the LIN signal receiving end of the main control module, and the emitter is also connected to the third power supply via the eighth resistor.

[0013] Further, the detection module includes a voltage detection unit and a current detection unit. The voltage detection unit includes a first operational amplifier, a ninth resistor, a tenth resistor, and an eleventh resistor. The first power supply is connected to the positive input end of the first operational amplifier after being divided by the ninth resistor and the tenth resistor. The negative input end of the first operational amplifier is connected to the output end and is connected to the voltage detection end of the main control module via the eleventh resistor. The current detection circuit includes a second operational amplifier, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a seventeenth resistor. The twelfth resistor serves as a current detection resistor, one end of which is connected to the negative power supply end of the device interface and one end of the thirteenth resistor, the other end of the twelfth resistor is grounded, the other end of the thirteenth resistor is connected to the positive input end of the second operational amplifier, is connected to the second power supply via the fourteenth resistor, and is grounded via the fifteenth resistor. A sixteenth resistor is connected in parallel between the negative input end and the output end of the second operational amplifier, and the negative input end is also grounded via the seventeenth resistor, and the output end is connected to the current detection end of the main control module.

[0014] Further, the display screen is a digital display tube.

[0015] Further, the housing is provided with an OBD interface.

[0016] The beneficial effects of the present utility model are:

[0017] The present utility model proposes a testing device for an automotive control module. By directly connecting to the automotive control module to be tested through connecting wires, it can detect the functional status of the automotive control module without installing the automotive control module back into the vehicle. After the user connects the testing device for the automotive control module to the automotive control module to be tested, they can match the type and model of the automotive control module to be tested with a single button press, eliminating the need to install the automotive control module to be tested back into the vehicle for testing and also saving the cumbersome matching and selection process, which can effectively improve the maintenance efficiency of the automotive control module and save time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an embodiment of a testing device for an automotive control module of the present utility model;

[0019] Figure 2 is a schematic block diagram of the internal circuit board;

[0020] Figure 3 is a schematic circuit diagram of the power module;

[0021] Figure 4 is a schematic circuit diagram of the power supply control module;

[0022] Figure 5 is a schematic circuit diagram of the CAN bus communication unit;

[0023] Figure 6 is a schematic circuit diagram of the LIN bus communication unit;

[0024] Figure 7 is a schematic circuit diagram of the voltage detection unit;

[0025] Figure 8 is a schematic circuit diagram of the current detection unit and the device interface.

[0026] In the figure:

[0027] 1 - housing, 2 - device interface, 3 - button, 4 - display screen, 5 - power interface, 6 - indicator light, 7 - OBD interface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0029] The terms "first", "second", and "third" in this application are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity or order of the indicated technical features. All directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative positional relationship or movement of components under a specific posture (as shown in the drawings); it should be noted that when a component is referred to as "fixed to", "disposed on", or "connected to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be one or more intermediate components therebetween. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0030] As Figures 1 to 8 shown, to solve the problems commonly existing in the prior art, an embodiment of a vehicle control module testing device is proposed in the present utility model. By directly connecting to the vehicle control module to be tested through connecting wires, the functional state of the vehicle control module can be detected without installing the vehicle control module back into the vehicle.

[0031] Specifically, referring to Figure 1 and Figure 2 , the vehicle control module testing device includes a housing 1. The housing 1 is provided with a device interface 2, a key 3, and a display screen 4. A circuit board is arranged inside the housing 1, and the circuit board includes a main control module, a power module, a power supply control module, a vehicle communication module, and a detection module. The device interface 2 is used to connect the vehicle control module to be tested. In a specific implementation, the vehicle control module to be tested can be connected through connecting wires, and the ports of the connecting wires are adapted to the vehicle control module to be tested. The power supply control module is respectively connected to the device interface 2, the main control module, and the power module, and is used to turn on or off the power supply of the power module to the vehicle control module to be tested according to the power control signal of the main control module. The vehicle communication module is connected between the device interface 2 and the main control module, and is used to convert and adapt the signals transmitted and received between the main control module and the vehicle control module to be tested. The detection module is connected between the device interface 2 and the main control module, and is used to detect the working voltage and current of the vehicle control module to be tested and send them to the main control module. The key 3 is connected to the main control module and is used to receive user operations. The display screen 4 is connected to the main control module and is used to display the working voltage and current of the vehicle control module to be tested.

[0032] The working principle of the embodiment of the present utility model is as follows: After the automotive control module testing device is connected to the automotive control module to be detected, the operator presses the button 3. After the main control module receives the signal of the button 3, it sends a power control signal to the power supply control module, and the power supply control module connects the power module to the device interface 2 to supply power to the automotive control module to be detected. Thereafter, the automotive control module testing device starts to communicate with the automotive control module to be detected, including receiving the device coding ID of the automotive control module to be detected, identifying the specific type and model of the automotive control module to be detected according to the device coding ID, and making a communication response. The operator can control the module to perform action tests in the button control area, or perform action tests on the automotive control module to be detected to observe the voltage and current changes, or connect a third-party diagnostic instrument at the bottom of the device to observe more data changes. The working current and voltage of the automotive control module are detected by the detection module and displayed by the main control module on the display screen 4. When the operator presses the button 3 again, the main control module will control the power supply control module to disconnect the power module from the device interface 2 and stop supplying power to the automotive control module to be detected.

[0033] As an example, the automotive control module to be detected is a gear lever module of a Land Rover or Jaguar vehicle model. The common faults of this kind of gear lever module are that the shift knob cannot be raised or lowered, the shift knob cannot be rotated, and the driving mode cannot be switched. When performing offline detection, connect the automotive control module testing device of the embodiment of the present utility model to the gear lever module. After the operator presses the button, the gear lever module gets powered and the shift knob rises. Subsequently, the main control module communicates with the gear lever module through the vehicle communication module to unlock the shift knob, and the operator can rotate the shift knob to verify whether the gear can be shifted. After the gear lever module gets powered, the working voltage and current of the gear lever module are obtained through the detection module and displayed on the display screen 4. After the function detection is completed, the operator presses the button 3 again, and the gear lever module is powered off and the shift knob falls back to its original position.

[0034] It should be noted that an automatic recognition and matching unit is provided in the main control module, which is used to receive the device coding ID of the automotive control module to be detected, identify the specific type and model of the automotive control module to be detected according to the device coding ID, and make a communication response according to the specific type and model of the automotive control module. Since some automotive control modules lock the operation actions, when performing specific operations, it is necessary to receive the data signal from the vehicle communication line to unlock it to facilitate the completion of the function test.

[0035] The main control module is also provided with a driving unit for performing action tests, including responding to the operator's key operation actions on the automotive control module test device and sending them to the automotive control module to be detected through the vehicle communication module. The operator can perform action tests in the key control area of the automotive control module test device, or perform action tests on the automotive control module to be detected to observe voltage and current changes. The operator can also connect a third-party diagnostic instrument to the bottom of the device to observe more data changes. For example, when the automotive control module to be detected is an EPS motor, the operator can control the forward or reverse rotation of the EPS motor through the keys on the automotive control module test device. The operator can directly observe the operation of the EPS motor, while observing the working voltage and current changes on the automotive control module test device. The operator can also connect a third-party diagnostic instrument to the bottom of the device to observe more data changes.

[0036] In the embodiment of the present utility model, the automotive control module to be detected is directly connected through connecting wires. Without installing the automotive control module back into the vehicle, the functional state of the automotive control module can be detected. After the user connects the automotive control module test device to the automotive control module to be detected, the type and model of the automotive control module to be detected can be matched with a single key press, without the need to install the automotive control module to be detected back into the vehicle for detection, and the cumbersome matching and selection process is also eliminated, which can effectively improve the maintenance efficiency of the automotive control module and save time costs.

[0037] In some embodiments, refer to Figure 1 and Figure 3 , the housing 1 is provided with a power interface 5 for connecting an external DC power supply; the power supply module includes an input protection unit, a first voltage conversion unit, and a second voltage conversion unit; the external DC power supply passes through the input protection unit to obtain a first power supply VCC - 12V, the first power supply VCC - 12V passes through the first voltage conversion unit to obtain a second power supply VCC - 5V, and the second power supply VCC - 5V passes through the second voltage conversion unit to obtain a third power supply VCC - 3V3; the input protection unit includes a fuse F1 and a Schottky diode D1, the first voltage conversion unit includes a first voltage conversion chip U1, and the second voltage conversion unit includes a second voltage conversion chip U2.

[0038] In a specific implementation, the first power supply voltage is 12V, the second power supply voltage is 5V, and the third power supply voltage is 3.3V. Multiple capacitors are provided at the input and output ends of the input protection unit, the first voltage conversion unit, and the second voltage conversion unit for filtering. A light-emitting diode POWER and a resistor R1 are connected in series between the third power supply VCC - 3V3 and the ground. The light-emitting diode POWER is used to indicate the connection status of the external power supply.

[0039] In some embodiments, refer to Figure 4, the power supply control module includes a first switching transistor Q3, a second switching transistor Q2, a first resistor R14, a second resistor R15, a third resistor R12, and a fourth resistor R8. The first switching transistor Q3 is an NPN transistor, and the second switching transistor Q2 is a PMOS transistor. The base of the first switching transistor Q3 is connected to the power control terminal EN_SW of the main control module via the first resistor R14, the emitter is grounded, and the collector is connected to the gate of the second switching transistor Q2 via the third resistor R12. A second resistor R15 is connected in parallel between the emitter and the collector. The source of the second switching transistor Q2 is connected to the first power supply VCC-12V, a fourth resistor R8 is connected in parallel between the gate and the drain, and the drain is connected to the power supply pin VCC-12VOUT of the device interface 2.

[0040] In this embodiment, when the power control terminal EN_SW of the main control module is at a high level, the first switching transistor Q3 conducts first, and there is a voltage difference between the gate and the source of the second switching transistor Q2, so it also conducts. The first power supply VCC-12V can be provided to the power supply terminal of the automotive control module to be tested. When the power control terminal EN_SW of the main control module is at a low level, both the first switching transistor Q3 and the second switching transistor Q2 are turned off, and the automotive control module to be tested has no power supply.

[0041] In a specific implementation, a resistor R13 and a light-emitting diode ACC are connected in series between the second switching transistor Q2 and the ground. The light-emitting diode ACC is used to indicate the power-on status of the automotive control module to be tested. The light-emitting diode ACC is arranged at the panel indicator 6 of the housing 1.

[0042] In some embodiments, the vehicle communication module includes a CAN bus communication unit and a LIN bus communication unit. In a specific implementation, the CAN bus communication unit can be used to convert the signals sent and received by the main control module into signals that can be transmitted on the automotive CAN bus. The CAN bus communication unit can be connected to the pins related to the CAN bus communication of the automotive control module to be tested through the device interface 2. Also, the LIN bus communication unit can be used to convert the signals sent and received by the main control module into signals that can be transmitted on the automotive LIN bus. The LIN bus communication unit can be connected to the pins related to the LIN bus communication of the automotive control module to be tested through the device interface 2.

[0043] In some embodiments, refer to Figure 5, the CAN bus communication unit includes a CAN communication conversion chip U2 and an ESD (electrostatic discharge) protection diode D2. The signal transmission end TXD of the CAN communication conversion chip U2 is connected to the CAN signal transmission end CAN_TXD of the main control module, the reception end RXD is connected to the CAN signal reception end CAN_RXD of the main control module, the CAN signal high-end CANH is connected to the CAN signal high-end CANH of device interface 2, the CAN signal low-end CANL is connected to the CAN signal low-end CANL of device interface 2. The first end of the ESD protection diode D2 is connected to the CAN signal high-end CANH of the CAN communication conversion chip U2, the second end of the ESD protection diode D2 is connected to the CAN signal high-end CANH of the CAN communication conversion chip U2, and the third end of the ESD protection diode D2 is grounded. The ESD protection diode D2 can provide anti-static protection for the CAN communication line.

[0044] In a specific implementation, the power supply terminal VCC of the CAN communication conversion chip U2 is connected to the second power supply VCC-5V, the reference terminal VREF is connected to the third power supply VCC-3V3. A resistor R2 is connected in parallel between the CAN signal high-end CANH and the CAN signal low-end CANL. The CAN signal high-end CANH is also connected to the CAN signal high-end detection terminal CANHSEN of the main control module through voltage division by resistors R37 and R39. The CAN signal low-end CANL is also connected to the CAN signal low-end detection terminal CANLSEN of the main control module through voltage division by resistors R38 and R40. The main control module can detect the CAN high-end signal and the CAN low-end signal converted by the CAN communication conversion chip U2.

[0045] In some embodiments, refer to Figure 6 , the LIN bus communication unit includes a third switching transistor Q6, a fourth switching transistor Q5, a fifth resistor R31, a sixth resistor R32, a seventh resistor R33 and an eighth resistor R30. The third switching transistor Q6 is an NPN transistor, the fourth switching transistor Q5 is a PNP transistor. The emitter of the third switching transistor Q6 is grounded, the base is connected to the LIN signal transmission end TXD of the main control module through the seventh resistor R33, the collector is connected to the LIN bus signal terminal LIN of device interface 2, the collector is connected to the first power supply VCC-12V through the fifth resistor R31, the collector is also connected to the base of the fourth switching transistor Q5 through the sixth resistor R32. The collector of the fourth switching transistor Q5 is grounded, the emitter is connected to the LIN signal reception end RXD of the main control module, and the emitter is also connected to the third power supply VCC-3V3 through the eighth resistor R30.

[0046] In a specific implementation, when the LIN signal transmitting end TXD of the main control module sends a high-level signal, the third switching transistor Q6 is turned on, and the LIN bus signal end LIN of the device interface 2 is at a low level; when the LIN signal transmitting end TXD of the main control module sends a low-level signal, the third switching transistor Q6 is turned off, and the LIN bus signal end LIN of the device interface 2 is in a high-impedance state. When the LIN signal transmitting end TXD of the main control module is at a low level and the LIN bus signal end LIN of the device interface 2 is at a low level, the fourth switching transistor Q5 is turned on, and the LIN signal receiving end RXD of the main control module is at a low level; when the LIN signal transmitting end TXD of the main control module is at a low level and the LIN bus signal end LIN of the device interface 2 is at a high level, the fourth switching transistor Q5 is turned off, and the LIN signal receiving end RXD of the main control module is in a high-impedance state.

[0047] In some embodiments, refer to Figure 7 and Figure 8 The detection module includes a voltage detection unit and a current detection unit. The voltage detection unit includes a first operational amplifier U5A, a ninth resistor R26, a tenth resistor R28, and an eleventh resistor R27. After being divided by the ninth resistor R26 and the tenth resistor R28, the first power supply VCC-12V is connected to the positive input terminal of the first operational amplifier U5A. The negative input terminal of the first operational amplifier U5A is connected to the output terminal and is connected to the voltage detection terminal ADV of the main control module through the eleventh resistor R27. The current detection circuit includes a second operational amplifier U5B, a twelfth resistor R41, a thirteenth resistor R44, a fourteenth resistor R43, a fifteenth resistor R46, a sixteenth resistor R42, and a seventeenth resistor R45. The twelfth resistor R41 serves as a current detection resistor, one end of which is connected to the negative power supply terminal of the device interface 2 and one end of the thirteenth resistor R44. The other end of the twelfth resistor R41 is grounded. The other end of the thirteenth resistor R44 is connected to the positive input terminal of the second operational amplifier U5B, is connected to the second power supply VCC-5V through the fourteenth resistor R43, and is grounded through the fifteenth resistor R46. A sixteenth resistor R42 is connected in parallel between the negative input terminal and the output terminal of the second operational amplifier U5B, and the negative input terminal is also grounded through the seventeenth resistor R45. The output terminal is connected to the current detection terminal ADI of the main control module. In a specific implementation, a plurality of capacitors are connected between the input terminals, output terminals of the first operational amplifier U5A and the second operational amplifier U5B and the ground for filtering.

[0048] In some embodiments, the display screen 4 is a digital display tube. The working voltage and current of the vehicle control module can be displayed in real time through the display screen 4, which is convenient for the operator to judge its working state when actually operating the vehicle control module.

[0049] In some embodiments, the housing 1 is provided with an OBD interface 7. Through the OBD interface 7, diagnostic tools of the original factory or third-party manufacturers can be directly accessed to test and verify the vehicle control module in the simulated vehicle environment. In a specific implementation, the OBD interface includes a voltage pin, a ground pin, a CAN bus communication high pin, a CAN bus communication low pin, and a LIN bus communication pin.

[0050] The present utility model is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they all fall within the protection scope of the present utility model.

Claims

1. A vehicle control module testing device, characterized in that: The invention comprises a housing (1), wherein the housing (1) is provided with a device interface (2), a button (3) and a display screen (4); a circuit board is arranged inside the housing (1), and the circuit board comprises a main control module, a power module, a power supply control module, a vehicle communication module and a detection module; the device interface (2) is used to connect to the vehicle control module to be detected; the power supply module is used to supply power to the vehicle control module test device and the vehicle control module to be detected; the power supply control module is respectively connected to the device interface (2), the main control module and the power supply module, and is used to connect or disconnect the power supply module to the vehicle control module according to the power supply control signal of the main control module. The vehicle control module to be detected is powered; the vehicle communication module is connected between the device interface (2) and the main control module, and is used to convert and adapt the signals received and sent between the main control module and the vehicle control module to be detected; the detection module is connected between the device interface (2) and the main control module, and is used to detect the working voltage and current of the vehicle control module to be detected, and send them to the main control module; the button (3) is connected to the main control module, and is used to receive user operations; the display screen (4) is connected to the main control module, and is used to display the working voltage and current of the vehicle control module to be detected.

2. An automobile control module testing device as claimed in claim 1, characterized in that: The housing (1) is provided with a power interface (5) for connecting an external DC power supply; the power module comprises an input protection unit, a first voltage conversion unit and a second voltage conversion unit; the external DC power supply obtains a first power supply (VCC-12V) through the input protection unit, the first power supply (VCC-12V) obtains a second power supply (VCC-5V) through the first voltage conversion unit, and the second power supply (VCC-5V) obtains a third power supply (VCC-3V3) through the second voltage conversion unit; the input protection unit comprises a fuse (F1) and a Schottky diode (D1), the first voltage conversion unit comprises a first voltage conversion chip (U1), and the second voltage conversion unit comprises a second voltage conversion chip (U9).

3. An automobile control module testing device as claimed in claim 2, characterized in that: The power supply control module comprises a first switch tube (Q3), a second switch tube (Q2), a first resistor (R14), a second resistor (R15), a third resistor (R12) and a fourth resistor (R8); the first switch tube (Q3) is an NPN tube, the second switch tube (Q2) is a PMOS tube, the base of the first switch tube (Q3) is connected to the power control terminal (EN_SW) of the main control module via the first resistor (R14), the emitter is grounded, the collector is connected to the gate of the second switch tube (Q2) via the third resistor (R12), the second resistor (R15) is connected in parallel between the emitter and the collector, the source of the second switch tube (Q2) is connected to the first power supply (VCC-12V), the fourth resistor (R8) is connected in parallel between the gate and the drain, and the drain is connected to the power pin (VCC-12VOUT) of the device interface (2).

4. The vehicle control module testing device according to claim 2, characterized in that: The vehicle communication module includes a CAN bus communication unit and a LIN bus communication unit.

5. The vehicle control module testing device according to claim 4, characterized in that: The CAN bus communication unit comprises a CAN communication conversion chip (U2) and an ESD protection diode (D2); a signal sending end of the CAN communication conversion chip (U2) is connected to a CAN signal sending end of the main control module, a receiving end is connected to a CAN signal receiving end of the main control module, a CAN signal high-order end is connected to a CAN signal high-order end of the device interface (2), and a CAN signal low-order end is connected to a CAN signal low-order end of the device interface (2); a first end of the ESD protection diode (D2) is connected to the CAN signal high-order end of the CAN communication conversion chip (U2), a second end of the ESD protection diode (D2) is connected to the CAN signal high-order end of the CAN communication conversion chip (U2), and a third end of the ESD protection diode (D2) is grounded.

6. The vehicle control module testing device according to claim 4, characterized in that: The LIN bus communication unit comprises a third switch tube (Q6), a fourth switch tube (Q5), a fifth resistor (R31), a sixth resistor (R32), a seventh resistor (R33) and an eighth resistor (R30), wherein the third switch tube (Q6) is an NPN tube, the fourth switch tube (Q5) is a PNP tube, the emitter of the third switch tube (Q6) is grounded, the base is connected to the LIN signal sending end of the main control module via the seventh resistor (R33), the collector is connected to the LIN bus signal end of the device interface (2), the collector is connected to the first power supply (VCC-12V) via the fifth resistor (R31), the collector is also connected to the base of the fourth switch tube (Q5) via the sixth resistor (R32), the collector of the fourth switch tube (Q5) is grounded, the emitter is connected to the LIN signal receiving end of the main control module, and the emitter is also connected to the third power supply (VCC-3V3) via the eighth resistor (R30).

7. The vehicle control module testing device according to claim 2, characterized in that: The detection module includes a voltage detection unit and a current detection unit; the voltage detection unit includes a first operational amplifier (U5A), a ninth resistor (R26), a tenth resistor (R28) and an eleventh resistor (R27); the first power supply (VCC-12V) is connected to the positive input end of the first operational amplifier (U5A) after voltage division by the ninth resistor (R26) and the tenth resistor (R28); the negative input end of the first operational amplifier (U5A) is connected to the output end and connected to the voltage detection end of the main control module through the eleventh resistor (R27); the current detection circuit includes a second operational amplifier (U5B), a twelfth resistor (R41), a thirteenth resistor (R44), a fourteenth resistor (R43), a fifteenth resistor (R46), a sixteenth resistor (R42) and a seventeenth resistor (R45), the twelfth resistor (R41) is used as a current detection resistor, one end of which is connected to the negative end of the power supply of the device interface (2) and one end of the thirteenth resistor (R44), the other end of the twelfth resistor (R41) is grounded, the other end of the thirteenth resistor (R44) is connected to the positive input end of the second operational amplifier (U5B), connected to the second power supply (VCC-5V) via the fourteenth resistor (R43), and grounded via the fifteenth resistor (R46), the sixteenth resistor (R42) is connected in parallel between the negative input end and the output end of the second operational amplifier (U5B), the negative input end is also grounded via the seventeenth resistor (R45), and the output end is connected to the current detection end of the main control module.

8. The vehicle control module testing device according to claim 1, characterized in that: The display screen (4) is a digital display tube.

9. The vehicle control module testing device according to claim 1, characterized in that: The housing (1) is provided with an OBD interface (7).

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