Vehicle-mounted terminal anti-tampering system and method

Abstract

A vehicle-mounted terminal anti-disassembly system and method, comprising: a primary MOS tube, a primary MOS tube self-locking opening circuit, a primary MOS tube closing circuit, a secondary MOS tube, a secondary MOS tube control circuit, a wire removal detection circuit and an MCU; a backup battery, a primary MOS tube, a secondary MOS tube and an MCU are connected in sequence to provide power to the MCU when both the primary MOS tube and the secondary MOS tube are turned on; the primary MOS tube self-locking opening circuit controls the primary MOS tube to turn on; the primary MOS tube closing circuit controls the primary MOS tube to turn off; the secondary MOS tube control circuit controls the secondary MOS tube to turn on / off; the wire removal detection circuit is connected to the vehicle-mounted terminal, the secondary MOS tube control circuit and the MCU respectively to control the secondary MOS tube to turn on when detecting that the vehicle-mounted terminal is disassembled, and the MCU recognizes that the vehicle-mounted terminal is disassembled. The present invention can rely on the backup battery to maintain long-term anti-disassembly monitoring after the vehicle main gate is closed.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted terminal power-off detection, and in particular to a vehicle-mounted terminal anti-disassembly system and method. Background Art

[0002] At present, many vehicles are equipped with on-board terminals with monitoring functions to facilitate vehicle monitoring centers to manage them. However, users often maliciously damage the on-board terminals to achieve illegal interests and other purposes, so that the vehicles are out of supervision, causing huge losses to dealers or society.

[0003] To this end, the relevant technology proposes the following four anti-dismantling technologies: the first is appearance anti-dismantling, that is, disguising the vehicle-mounted terminal as other devices, such as a power supply; the second is shell anti-dismantling, that is, increasing the difficulty of disassembly, such as installing it through special and specially made screws, so that ordinary screwdrivers on the market cannot be removed; the third is relay anti-dismantling, that is, by connecting the auxiliary contacts of the relay of the vehicle-mounted terminal in series with the starting circuit of the engine, so that the vehicle cannot be started when the vehicle-mounted terminal is dismantled; the fourth is backup battery anti-dismantling, that is, providing a backup battery for the vehicle-mounted terminal, and when the vehicle-mounted positioning terminal is powered off or the power cord is cut off, it is powered by the backup battery.

[0004] The above anti-dismantling technologies can achieve anti-dismantling effects to a certain extent, but none of the above technologies take into account how to effectively perform anti-dismantling monitoring and achieve long-term monitoring through a backup battery after the vehicle's main power switch is disconnected. Summary of the invention

[0005] The main purpose of the present invention is to provide a vehicle-mounted terminal anti-tampering system and method, which can maintain the anti-tampering monitoring function for a long time by relying on a backup battery after the vehicle main gate is closed.

[0006] The present invention adopts the following technical solution:

[0007] On the one hand, a vehicle terminal anti-disassembly system includes: a primary MOS tube, a primary MOS tube self-locking opening circuit, a primary MOS tube closing circuit, a secondary MOS tube, a secondary MOS tube control circuit, a wire removal detection circuit and an MCU; a backup battery, a primary MOS tube, a secondary MOS tube and an MCU are connected in sequence to provide power to the MCU when the primary MOS tube and the secondary MOS tube are both turned on; the primary MOS tube self-locking opening circuit is connected to the MCU to control the primary MOS tube to be turned on according to an output signal of a second end of the MCU; the primary MOS tube closing circuit is respectively connected to the primary MOS tube self-locking opening circuit and the MCU to control the primary MOS tube to be turned off according to an output signal of a third end of the MCU; the secondary MOS tube control circuit is respectively connected to the MCU and the wire removal detection circuit to control the secondary MOS tube to be turned on / off according to an output signal of a first end of the MCU or according to an output signal of the wire removal detection circuit; the wire removal detection circuit is respectively connected to the vehicle terminal, the secondary MOS tube control circuit and the MCU to control the secondary MOS tube to be turned on when it is detected that the vehicle terminal is removed, and the MCU recognizes that the vehicle terminal is removed.

[0008] Preferably, the first-level MOS tube self-locking start circuit includes: a third transistor, a first resistor, a second resistor and a fifth resistor; one end of the fifth resistor is connected to the base of the third transistor, and the other end of the fifth resistor is connected to the second end of the MCU; the base of the third transistor is also connected to the drain of the first-level MOS tube through the second resistor; the collector of the third transistor is connected to the gate of the first-level MOS tube; the collector of the third transistor is also connected to the source of the first-level MOS through the first resistor; the emitter of the third transistor is grounded.

[0009] Preferably, the first-level MOS tube shutdown circuit includes: a sixth transistor and a seventh resistor; one end of the seventh resistor is connected to the base of the sixth transistor, and the other end of the seventh resistor is connected to the third end of the MCU; the collector of the sixth transistor is connected to the first-level MOS tube self-locking start circuit; the emitter of the sixth transistor is grounded.

[0010] Preferably, the secondary MOS tube control circuit includes a first control circuit and a second control circuit; the first control circuit includes a fourth triode, a third resistor, a fourth resistor and a fourth diode; the second control circuit includes a fifth triode and a sixth resistor; one end of the third resistor is respectively connected to the drain of the primary MOS tube and the source of the secondary MOS tube, and the other end of the third resistor is respectively connected to the anode of the fourth diode and the base of the fourth triode; the cathode of the fourth diode is connected to the wire removal detection circuit; the emitter of the fourth triode is connected to the emitter of the fifth triode and is grounded; the collector of the fourth triode is connected to one end of the third resistor through the fourth resistor; the collector of the fifth triode is respectively connected to the collector of the fourth triode and the gate of the secondary MOS tube; the fifth triode is connected to the first end of the MCU through the sixth resistor.

[0011] Preferably, the wire removal detection circuit includes a third diode and an eighth resistor; a first connector and a second connector are provided at the fixed connection between the vehicle body and the vehicle-mounted terminal; the first connector is connected to the vehicle-mounted terminal, and the first connector is provided with two direct-connection pins; the second connector has two pins corresponding to the two direct-connection pins, one is grounded, and the other is connected to the cathode of the third diode; the anode of the third diode is respectively connected to the eighth resistor and the fourth end of the MCU.

[0012] Preferably, the vehicle-mounted terminal anti-disassembly system also includes: a second diode; the anode of the second diode is connected to the drain of the secondary MOS tube, and the cathode of the second diode is connected to the power supply terminal of the MCU.

[0013] Preferably, the primary MOS tube and the secondary MOS tube are both PMOS tubes.

[0014] In a second aspect, a vehicle-mounted terminal anti-tampering method includes the vehicle-mounted terminal anti-tampering system, and the method includes:

[0015] After the vehicle terminal is installed, the main power supply supplies power to the MCU, and the MCU controls the primary MOS tube to be turned on through the primary MOS tube self-locking opening circuit; the MCU also controls the secondary MOS tube to be turned on through the output signal of the first end of the MCU, and the control is powered by the main power supply;

[0016] When the main power supply is abnormal, the backup battery is switched to power the MCU, and after a preset delay, the output signal of the first end of the MCU controls the secondary MOS tube to be turned off, and the backup battery stops supplying power;

[0017] When the vehicle-mounted terminal is removed, the output signal of the disconnection detection circuit controls the secondary MOS tube to turn on, and the backup battery supplies power to the MCU; the MCU recognizes that the vehicle-mounted terminal is removed according to the output signal of the disconnection detection circuit.

[0018] Preferably, the vehicle-mounted terminal anti-disassembly method further includes:

[0019] When the vehicle-mounted terminal is not installed, the main power supply supplies power to the MCU, and the MCU controls the primary MOS tube to be turned off through the MOS tube turning off circuit.

[0020] Preferably, the vehicle-mounted terminal anti-disassembly method further includes: after the MCU recognizes that the vehicle-mounted terminal is disassembled according to the output signal of the wire removal detection circuit, the MCU sends the detection result to a vehicle monitoring center.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) When the primary MOS tube is turned on, i.e., when the anti-tampering is enabled, only the first resistor, the second resistor, and the third resistor consume current, and have extremely low standby current. In the severe case of a car main switch being powered off, the installation status of the vehicle terminal can be monitored for a long time only by the backup battery;

[0023] (2) The present invention controls the enabling or disabling of the anti-disassembly function by controlling the primary MOS tube to be turned on or off. Before the vehicle terminal is installed, the primary MOS tube is controlled to be turned off to disable the anti-disassembly function to prevent false alarms; only after the vehicle terminal is installed, the primary MOS tube is controlled to be turned on to enable the anti-disassembly function;

[0024] (3) The anti-disassembly function of the present invention does not affect other usage scenarios of the backup battery (such as: instantaneous power drop, vehicle power main switch off, etc., can maintain the normal activation of the backup battery), and the activation of the backup battery is controlled by controlling the opening / closing of the secondary MOS tube through the first control circuit or the second control circuit.

[0025] 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 so that it can be implemented in accordance with the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below.

[0026] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1This is a principle block diagram of the vehicle terminal anti-tampering system according to an embodiment of the present invention;

[0028] Figure 2 A circuit diagram of a vehicle terminal anti-tampering system according to an embodiment of the present invention;

[0029] Figure 3 The figure is a flow chart of a vehicle terminal anti-tampering method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] See also Figure 1 and Figure 2 As shown, the present invention provides a vehicle terminal anti-disassembly system, comprising: a primary MOS tube Q1, a primary MOS tube self-locking opening circuit 10, a primary MOS tube closing circuit 20, a secondary MOS tube Q2, a secondary MOS tube control circuit 30, a wire removal detection circuit 40 and an MCU 50; a backup battery 60, a primary MOS tube Q1, a secondary MOS tube Q2 and an MCU 50 are sequentially connected to provide power to the MCU 50 when the primary MOS tube Q1 and the secondary MOS tube Q2 are both turned on; the primary MOS tube self-locking opening circuit 10 is connected to the MCU 50 to control the primary MOS tube Q1 to be turned on according to an output signal of a second terminal GPIO2 of the MCU 50; the primary MOS tube closing circuit 20 is respectively connected to the primary MOS tube self-locking opening circuit 10 and the MCU 50 to control the primary MOS tube Q1 to be turned off according to an output signal of a third terminal GPIO3 of the MCU 50; the secondary MOS tube control circuit 30 is respectively connected to the MCU 50 and the wire removal detection circuit 40 to control the primary MOS tube Q1 to be turned off according to an output signal of a third terminal GPIO3 of the MCU 50 The output signal of the first end GPIO1 of 50 or the output signal of the wire removal detection circuit 40 controls the turning on / off of the secondary MOS tube Q2; the wire removal detection circuit 40 is connected to the vehicle terminal, the secondary MOS tube control circuit 30 and the MCU 50 respectively to control the turning on of the secondary MOS tube Q2 when it is detected that the vehicle terminal is removed, and the MCU 50 recognizes that the vehicle terminal is removed.

[0032] In the present invention, the opening / closing of the primary MOS tube Q1 is equipped with a self-locking control circuit (a primary MOS tube self-locking opening circuit 10 and a primary MOS tube closing circuit 20), and the opening / closing of the secondary MOS is controlled by the wire removal detection circuit 40 and the MCU 50 through an OR gate. After the MCU 50 controls the primary MOS tube Q1 to open, it controls the secondary MOS tube Q2 to close. At this time, the main power switch connected to the car battery is disconnected, and the MCU 50 is powered off. The primary MOS tube Q1 is self-locked and remains in the open state, and the secondary MOS tube Q2 can monitor the wire removal detection signal in real time. If the wire is pulled out, the secondary MOS tube Q2 will be turned on and power will be supplied to the MCU 50 because it is also controlled by the anti-disassembly detection pin 6, triggering the illegal removal alarm of the vehicle terminal.

[0033] The wire unplugging detection is realized by connecting a PIN pin on the vehicle body connector to the GND of the device externally through a wiring harness. When the connector is connected normally, the anti-disassembly detection pin 6 is short-circuited with the power ground of the vehicle terminal itself and is not affected by the main power switch of the vehicle (the main power switch of some vehicles controls the negative pole). When the vehicle terminal is dismantled, the secondary MOS tube Q2 is turned on, and the backup battery 60 supplies power to the MCU 50. Due to the internal pull-up resistor of the anti-disassembly detection pin 6, the MCU 50 recognizes it as a high level, triggering the anti-disassembly reporting function.

[0034] In this embodiment, the primary MOS tube Q1 and the secondary MOS tube Q2 are both PMOS tubes. The primary MOS tube Q1 is used as the first-stage switch of the backup battery 60, and is also used as a switch to enable and disable the anti-disassembly function. The primary MOS tube Q1 is turned on to enable the anti-disassembly function, and the primary MOS tube Q1 is turned off to disable the anti-disassembly function. The secondary MOS tube Q2 is used as the second-stage switch of the backup battery 60, and can be controlled by the anti-disassembly detection pin 6 or the MCU 50 at the same time.

[0035] The first-level MOS self-locking start circuit 10 includes: a third transistor Q3, a first resistor R1, a second resistor R2 and a fifth resistor R5; one end of the fifth resistor R5 is connected to the base of the third transistor Q3, and the other end of the fifth resistor R5 is connected to the second end GPIO2 of the MCU 50; the base of the third transistor Q3 is also connected to the drain of the first-level MOS Q1 through the second resistor R2; the collector of the third transistor Q3 is connected to the gate of the first-level MOS Q1; the collector of the third transistor Q3 is also connected to the source of the first-level MOS through the first resistor R1; the emitter of the third transistor Q3 is grounded. When the second end GPIO2 of the MCU 50 is set high, the third transistor Q3 is turned on, the first-level MOS Q1 is turned on, and the first-level MOS Q1 outputs a high level. At this time, the switch state of the first-level MOS Q1 is no longer controlled by the second end GPIO2 of the MCU 50, forming a self-locking state.

[0036] The first-level MOS tube closing circuit 20 includes: a sixth transistor Q6 and a seventh resistor R7; one end of the seventh resistor R7 is connected to the base of the sixth transistor Q6, and the other end of the seventh resistor R7 is connected to the third terminal GPIO3 of the MCU 50; the collector of the sixth transistor Q6 is connected to the first-level MOS tube self-locking opening circuit 10; the emitter of the sixth transistor Q6 is grounded. The first-level MOS tube closing circuit 20 forms a closing circuit through the sixth transistor Q6, which is used to close the self-locking circuit, thereby closing the first-level MOS tube Q1.

[0037] The secondary MOS tube control circuit 30 includes a first control circuit and a second control circuit; the first control circuit includes a fourth transistor Q4, a third resistor R3, a fourth resistor R4 and a fourth diode D4; the second control circuit includes a fifth transistor Q5 and a sixth resistor R6; one end of the third resistor R3 is connected to the drain of the primary MOS tube Q1 and the source of the secondary MOS tube Q2, respectively, and the other end of the third resistor R3 is connected to the anode of the fourth diode D4 and the base of the fourth transistor Q4, respectively; the cathode of the fourth diode D4 is connected to the disconnection detection circuit 40; the emitter of the fourth transistor Q4 is connected to the emitter of the fifth transistor Q5 and is grounded; the collector of the fourth transistor Q4 is connected to one end of the third resistor R3 through the fourth resistor R4; the collector of the fifth transistor Q5 is connected to the collector of the fourth transistor Q4 and the gate of the secondary MOS tube Q2, respectively; the fifth transistor Q5 is connected to the MCU through the sixth resistor R6 The first end GPIO1 of 50 is connected.

[0038] The wire removal detection circuit 40 includes a third diode D3 and an eighth resistor R8; a first connector J1 and a second connector J2 are provided at the fixed connection between the vehicle body and the vehicle-mounted terminal; the first connector J1 is connected to the vehicle-mounted terminal, and the first connector J1 is provided with two direct connection pins; the second connector J2 has two pins (5, 6) corresponding to the two direct connection pins, one pin 5 is grounded GND, and the other pin 6 is connected to the cathode of the third diode D3; the anode of the third diode D3 is respectively connected to the eighth resistor R8 and the fourth terminal GPIO4 of the MCU 50. When the vehicle-mounted terminal is normally installed, the wire removal detection circuit 40 outputs a low level, and when the vehicle-mounted terminal is removed, the wire removal detection circuit 40 outputs a high level.

[0039] The vehicle terminal anti-disassembly system further includes: a second diode D2; an anode of the second diode D2 is connected to the drain of the secondary MOS tube Q2, and a cathode of the second diode D2 is connected to the power supply terminal of the MCU 50.

[0040] The control principle of this embodiment includes the following:

[0041] (1) Disable the anti-tampering function: pull up the third terminal GPIO3 of the MCU 50 to control the sixth transistor Q6 to be turned on, pull down the collector level of the third transistor Q3, and turn off the third transistor Q3, thereby controlling the first-level MOS tube Q1 to be turned off. At this time, the power supply of the backup battery 60 is always turned off and is not affected by the anti-tampering detection pin 6;

[0042] (2) Activate the anti-tampering function: pull up the second terminal GPIO2 of the MCU 50 to control the third transistor Q3 to be turned on, thereby controlling the first-level MOS tube Q1 to be turned on;

[0043] (3) The device is installed normally: the anti-disassembly detection pin 6 is pulled low, the fourth transistor Q4 is turned off, the secondary MOS tube Q2 is turned off, the MCU 50 does not draw power from the backup battery 60, and the fourth terminal GPIO4 of the MCU 50 detects a low level. The MCU 50 determines that the vehicle terminal is installed normally;

[0044] (4) Equipment removal: The anti-removal detection pin 6 is suspended, the third resistor R3 is pulled up effectively, the fourth transistor Q4 is turned on, the secondary MOS tube Q2 is turned on, the backup battery 60 supplies power to the MCU 50, and the fourth terminal GPIO4 of the MCU 50 is pulled high by the eighth resistor R8. The MCU 50 determines that the vehicle-mounted terminal has been removed.

[0045] (5) Enabling the backup battery 60 under non-removal conditions: The primary MOS tube Q1 is still turned on, and the MCU 50 controls the first terminal GPIO1 to be pulled high, and the fifth transistor Q5 is turned on, thereby controlling the secondary MOS tube Q2 to be turned on, and the backup battery 60 supplies power to the MCU 50.

[0046] It should be noted that the backup battery will only be started when the main power supply is abnormal. The main power supply is powered by the car battery. When the main power switch is turned off, the car battery stops supplying power, and the MCU can only be powered by the backup battery. This application is to manage the backup battery to maintain long-term anti-tampering monitoring after the car battery stops supplying power.

[0047] See also Figure 3 As shown, the present invention provides a vehicle terminal anti-tampering method, including the vehicle terminal anti-tampering system, and the method includes:

[0048] S301, determine whether the vehicle terminal is installed. If the installation is completed, execute S302, otherwise, the MCU pulls up GPI03, controls the first-level MOS tube to turn off, and disables the anti-disassembly monitoring function;

[0049] S302, the MCU pulls up GPIO2 and pulls down GPIO3 to control the first-level MOS tube to turn on;

[0050] S303, the MCU releases GPIO2 and GPIO3, and the primary MOS tube is self-locked and remains in an open state;

[0051] S304, the MCU pulls up GPIO1 to control the secondary MOS tube to turn on;

[0052] S305, determining whether the main power supply is abnormal, if abnormal, executing S306;

[0053] S306, determine whether the unplug detection is triggered. If not, the MCU saves the system data and delays for a preset time. After the preset time is up, the MCU pulls down GPIO1 to control the secondary MOS tube to turn off. The system enters a low-power anti-disassembly monitoring mode. If triggered, execute S307.

[0054] S307, the wire unplugging detection controls the secondary MOS tube to turn on, the backup battery supplies power to the MCU, and the MCU is powered on; after the MCU is powered on, the GPIO4 pin detects that the vehicle-mounted terminal is removed, and an illegal removal alarm is triggered.

[0055] Furthermore, after the MCU recognizes that the vehicle-mounted terminal has been removed according to the output signal of the wire removal detection circuit, in addition to triggering an illegal removal alarm, it also sends the detection result to the vehicle monitoring center to notify the vehicle monitoring center that a removal event has occurred.

[0056] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A vehicle terminal anti-tampering system, characterized in that: include: A primary MOS tube, a primary MOS tube self-locking opening circuit, a primary MOS tube closing circuit, a secondary MOS tube, a secondary MOS tube control circuit, a wire removal detection circuit and an MCU; a backup battery, a primary MOS tube, a secondary MOS tube and an MCU are connected in sequence to provide power to the MCU when the primary MOS tube and the secondary MOS tube are both turned on; the primary MOS tube self-locking opening circuit is connected to the MCU to control the primary MOS tube to be turned on according to an output signal of the second end of the MCU; the primary MOS tube closing circuit is respectively connected to the primary MOS tube self-locking opening circuit and the MCU to control the primary MOS tube to be turned off according to an output signal of the third end of the MCU; the secondary MOS tube control circuit is respectively connected to the MCU and the wire removal detection circuit to control the secondary MOS tube to be turned on / off according to an output signal of the first end of the MCU or according to an output signal of the wire removal detection circuit; the wire removal detection circuit is respectively connected to the vehicle-mounted terminal, the secondary MOS tube control circuit and the MCU to control the secondary MOS tube to be turned on when it is detected that the vehicle-mounted terminal is removed, and the MCU recognizes that the vehicle-mounted terminal is removed.

2. The vehicle terminal anti-tampering system according to claim 1, characterized in that: The first-level MOS tube self-locking start circuit includes: a third triode, a first resistor, a second resistor and a fifth resistor; one end of the fifth resistor is connected to the base of the third triode, and the other end of the fifth resistor is connected to the second end of the MCU; the base of the third triode is also connected to the drain of the first-level MOS tube through the second resistor; the collector of the third triode is connected to the gate of the first-level MOS tube; the collector of the third triode is also connected to the source of the first-level MOS through the first resistor; the emitter of the third triode is grounded.

3. The vehicle terminal anti-tampering system according to claim 1, characterized in that: The first-level MOS tube closing circuit includes: a sixth transistor and a seventh resistor; one end of the seventh resistor is connected to the base of the sixth transistor, and the other end of the seventh resistor is connected to the third end of the MCU; the collector of the sixth transistor is connected to the first-level MOS tube self-locking opening circuit; the emitter of the sixth transistor is grounded.

4. The vehicle terminal anti-tampering system according to claim 1, characterized in that: The secondary MOS tube control circuit includes a first control circuit and a second control circuit; the first control circuit includes a fourth triode, a third resistor, a fourth resistor and a fourth diode; the second control circuit includes a fifth triode and a sixth resistor; one end of the third resistor is respectively connected to the drain of the primary MOS tube and the source of the secondary MOS tube, and the other end of the third resistor is respectively connected to the anode of the fourth diode and the base of the fourth triode; the cathode of the fourth diode is connected to the wire removal detection circuit; the emitter of the fourth triode is connected to the emitter of the fifth triode and is grounded; the collector of the fourth triode is connected to one end of the third resistor through the fourth resistor; the collector of the fifth triode is respectively connected to the collector of the fourth triode and the gate of the secondary MOS tube; the fifth triode is connected to the first end of the MCU through the sixth resistor.

5. The vehicle terminal anti-tampering system according to claim 1, characterized in that: The wire removal detection circuit includes a third diode and an eighth resistor; a first connector and a second connector are provided at the fixed connection between the vehicle body and the vehicle-mounted terminal; the first connector is connected to the vehicle-mounted terminal, and the first connector is provided with two direct-connection pins; the second connector has two pins corresponding to the two direct-connection pins, one is grounded, and the other is connected to the cathode of the third diode; the anode of the third diode is respectively connected to the eighth resistor and the fourth end of the MCU.

6. The vehicle terminal anti-tampering system according to claim 1, characterized in that: Also includes: A second diode; an anode of the second diode is connected to the drain of the secondary MOS tube, and a cathode of the second diode is connected to the power supply terminal of the MCU.

7. The vehicle terminal anti-tampering system according to claim 1, characterized in that: The first-level MOS tube and the second-level MOS tube are both PMOS tubes.

8. A vehicle terminal anti-disassembly method, characterized in that: The vehicle terminal anti-tampering system according to any one of claims 1 to 6 comprises: After the vehicle terminal is installed, the main power supply supplies power to the MCU, and the MCU controls the primary MOS tube to be turned on through the primary MOS tube self-locking opening circuit; the MCU also controls the secondary MOS tube to be turned on through the output signal of the first end of the MCU, and the control is powered by the main power supply; When the main power supply is abnormal, the backup battery is switched to power the MCU, and after a preset delay, the output signal of the first end of the MCU controls the secondary MOS tube to be turned off, and the backup battery stops supplying power; When the vehicle-mounted terminal is removed, the output signal of the disconnection detection circuit controls the secondary MOS tube to turn on, and the backup battery supplies power to the MCU; the MCU recognizes that the vehicle-mounted terminal is removed according to the output signal of the disconnection detection circuit.

9. The vehicle terminal anti-disassembly method according to claim 8, characterized in that: Also includes: When the vehicle-mounted terminal is not installed, the main power supply supplies power to the MCU, and the MCU controls the primary MOS tube to be turned off through the MOS tube turning off circuit.

10. The vehicle terminal anti-disassembly method according to claim 8, characterized in that: Also includes: After the MCU recognizes that the vehicle-mounted terminal is removed according to the output signal of the wire removal detection circuit, the MCU sends the detection result to the vehicle monitoring center.

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