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CN-121989676-A - Dual-mode unmanned drunk driving prevention and control method and device

CN121989676ACN 121989676 ACN121989676 ACN 121989676ACN-121989676-A

Abstract

The invention relates to the technical field of vehicle-mounted safety control, and discloses a dual-mode unmanned drunk driving prevention and control method and device. The device comprises an OBD interface main control unit, an expiration detection unit and a flexible connection structure for connecting the OBD interface main control unit and the expiration detection unit, wherein a physical unclonable conductive texture film layer is arranged in the flexible connection structure and is used for forming unique electrical response characteristics. The main control unit realizes the dual authentication of the physical identity and the communication identity of the expiration detection unit by detecting the impedance characteristic of the conductive texture film layer and combining encryption communication authentication. The system identifies a manned mode or an unmanned mode based on the vehicle CAN bus signal, and executes corresponding alcohol detection flow and vehicle starting or manual taking over permission control under different modes. When authentication abnormality, alcohol exceeding or connection abnormality is detected, a permanent failure protection mechanism is triggered. The drunk driving prevention and control system combining physical authentication, electrical authentication and dual-mode control is constructed, and the safety and tamper resistance of the system are improved.

Inventors

  • HE WENYING
  • HE FENGCHAO

Assignees

  • 和文莹

Dates

Publication Date
20260508
Application Date
20260316

Claims (10)

  1. 1. The utility model provides a dual mode unmanned drunk driving prevention and control method which is characterized in that the method is applied to on-vehicle device, on-vehicle device includes the anti-disassembly structure that has the electrically conductive texture rete of physics unclonable, and the method includes: Identifying a current driving mode of the vehicle, wherein the driving mode comprises a manned driving mode and an unmanned driving mode; When the driver is identified as having a driving mode, the driver is authenticated before starting the alcohol detection process; Detecting impedance characteristics of the conductive texture film layer and matching the impedance characteristics with preset reference characteristics, and simultaneously executing encryption handshake communication, and limiting vehicle starting when the impedance characteristics are failed to match or the encryption communication is failed; Executing an alcohol detection flow, and controlling the vehicle starting authority according to the detection result; When the unmanned mode is identified, the vehicle is allowed to automatically drive and run, the alcohol detection flow is triggered when a manual take-over request is received, and the manual take-over authority is locked when the detection is unqualified or the detection is incomplete; triggering permanent failure protection and sending alarm information when detecting the damage of the anti-dismantling structure, abnormal connection or authentication failure.
  2. 2. The method according to claim 1, characterized in that: The impedance characteristic of the conductive texture film layer is used as a physical unclonable function, and forms a hardware-level binding relation with the encryption authentication chip and the decryption chip, and when the time sequence response characteristic of the simulation signal is not matched with the real physical impedance characteristic, the encryption handshake communication is automatically disabled.
  3. 3. The method according to claim 1, characterized in that: The matching of the impedance characteristic with the preset reference characteristic comprises temperature compensation of the reference impedance value according to the ambient temperature detected by the temperature sensor.
  4. 4. The method according to claim 1, characterized in that: the step of detecting the impedance characteristics of the conductive texture film layer comprises the steps of adopting a multidimensional impedance characteristic sampling mechanism, and constructing multidimensional physical fingerprint characteristic vectors by applying a plurality of excitation signals with different frequencies or different amplitudes to the conductive texture film layer and collecting corresponding frequency domain response characteristics and/or time domain response characteristics.
  5. 5. The method according to claim 4, wherein: The multidimensional physical fingerprint feature vector is used as a key generation seed to be input into a key derivation algorithm module to generate a communication session key or a device binding key for encrypting handshake communication authentication.
  6. 6. The method according to claim 1, characterized in that: The alcohol detection flow comprises the steps of detecting the blowing air flow through an MEMS differential pressure air flow sensor, and starting the alcohol sensor to detect the alcohol concentration only when the duration and the pressure range which accord with the natural blowing characteristics of the human body are detected.
  7. 7. The method according to claim 1, characterized in that: The locking of the manual take-over authority comprises sending an authority locking instruction to a vehicle control system through a vehicle CAN bus so as to prohibit the vehicle from being switched from an unmanned mode to a manual driving mode.
  8. 8. The method according to claim 1, characterized in that: The permanent failure protection comprises the steps of detecting the voltage of a preset signal line through a hysteresis comparator, and triggering the silicon controlled rectifier to conduct when the voltage exceeds a preset threshold value and continuously reaches a set time, so that a power supply loop is short-circuited and the unrecoverable safety element is fused.
  9. 9. A dual-mode unmanned drunk driving prevention and control device is characterized by comprising: An OBD interface main control unit; an expiration detecting unit; the flexible connection structure is used for connecting the OBD interface main control unit and the expiration detection unit; wherein, the flexible connection structure is internally provided with a physical unclonable conductive texture film layer so as to form unique electrical response characteristics; The OBD interface main control unit comprises a physical fingerprint identification circuit, and is used for detecting the electrical response characteristics of the conductive texture film layer and carrying out identity authentication; the OBD interface main control unit and the expiration detection unit are respectively provided with an encryption authentication chip for executing communication encryption authentication; And when the physical identity authentication fails or the encryption authentication fails, the OBD interface main control unit limits the starting of the vehicle.
  10. 10. The apparatus according to claim 9, wherein: The flexible connection structure is a flexible flat connection flat cable, is a multi-layer composite structure and sequentially comprises a first insulating layer, a conductive texture film layer and a second insulating layer from bottom to top, and a signal conductor and a power conductor are arranged between the insulating layers.

Description

Dual-mode unmanned drunk driving prevention and control method and device Technical Field The invention relates to the technical field of vehicle safety control, in particular to a dual-mode unmanned drunk driving prevention and control method and device, and in particular relates to a vehicle-mounted alcohol detection and anti-disassembly safety control technology based on a physical unclonable structure, electric identity authentication and dual-mode control logic, which is suitable for intelligent network vehicles with unmanned mode and unmanned mode switching capability. Background Drunk driving is one of the important factors causing road traffic accidents. In order to reduce drunk driving from the source, an on-board alcohol detection start control Device (generally referred to as drunk driving Interlock Device) is gradually applied to motor vehicles. Such devices typically require the driver to perform breath alcohol detection prior to vehicle start-up, and when the detection results meet preset safety standards, the vehicle may start-up or release the start-up restriction, thereby restricting the driver's drunk driving behavior at the technical layer. At present, a relatively common vehicle-mounted drunk driving prevention and control device in the market mostly adopts an installation mode based On an OBD (On-Board Diagnostics) interface. Such devices typically include an OBD interface master control unit connected to the vehicle electrical system through the OBD interface and implementing management of vehicle starting authority or control logic through the vehicle communication bus, and an exhalation detection unit for collecting the driver's exhalation gas and detecting alcohol concentration. The main control unit and the expiration detection unit are generally electrically connected through a connecting wire or a plug-in connector, so that a complete drunk driving detection system is formed. However, the prior art still has a certain potential safety hazard in the practical application process. Firstly, in terms of structural connection, a main control unit and an expiration detection unit of the existing device are generally connected by adopting a plug-in connector or a common lead, and the structure is easy to manually remove, replace or wire-wrap in actual use although convenient to install. For example, after completing one normal alcohol detection, the driver may misunderstand that the detection unit is still in a normal connection state by pulling out the breath detection unit or replacing the connection structure, thereby bypassing the alcohol detection flow. Secondly, in the aspect of an electrical detection mechanism, part of the existing devices judge the connection integrity by detecting the on-off state or the fixed resistance value of a circuit. For example, by providing a loop detection resistor in the connection line, it is determined that the connection is normal when the resistance value is detected to be within a preset range. However, such detection approaches are typically based on only a single electrical parameter, and an attacker may bypass the electrical detection mechanism by simply measuring the electrical characteristic and replacing it with an equivalent resistance, a resistive network, or an analog circuit. Again, in terms of identity authentication mechanisms, some systems introduce communication encryption techniques to enhance security, but rely heavily on software encryption algorithm implementations of the master control chip. Because of the risk that software encryption algorithms may be inversely analyzed or keys read, once the communication protocol is broken, an attacker may make alternative detection units with the same communication protocol, bypassing the system authentication mechanism at the logical level. In addition, with the development of automatic driving technology, vehicles gradually have a capability of switching between a manned mode and an unmanned mode. In such vehicles, the driver may request manual take over of vehicle control in certain situations when the autopilot system is running. However, the existing drunk driving detection device is designed for the traditional manned scene, and the safety problem of manual takeover in the unmanned scene is not fully considered. For example, in an unmanned mode, the driver may directly request to take over vehicle control in an alcohol state, and existing systems may not be able to effectively limit this behavior, thus presenting a certain safety risk. In summary, the existing vehicle-mounted drunk driving prevention and control device still mainly uses a single protection mechanism in the aspects of connection structure, disassembly prevention detection, electrical identity recognition, driving mode adaptation and the like, and the detection logic is concentrated on judging the connection state, so that the recognition capability of the authenticity of the connection unit is lacking. Meanwhile, th