Automobile drunk driving prevention system and method based on passenger state and air alcohol detection

Abstract

The invention belongs to the technical field of automobile safety, and discloses an automobile drunk driving prevention system and method based on passenger state and air alcohol detection, an alcohol concentration detection module comprises an alcohol sensor in a driver area and an alcohol sensor in a public area / passenger area in an automobile; the passenger state detection module comprises a seat sensor and a camera; the central control unit is mounted below a vehicle instrument panel; the active expiration reinspection module is integrated in a steering wheel scheme, or is designed into an independent small handheld or fixed mouthpiece; the actuator is connected to an original start button circuit, a transmission control unit (TCU) or an engine control unit (ECU) of a vehicle through a relay or a control signal wire harness and sends a'start / operation limiting 'instruction. The early warning device utilizes an original instrument panel display system, a horn system and a sound system of the vehicle. According to the invention, passenger positioning and specific area alcohol concentration monitoring are integrated, and the risk of passenger drinking misjudgment caused by only depending on the overall concentration in the vehicle is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to, but is not limited to, the field of automobile safety technology, and in particular relates to a system and method for preventing drunk driving based on passenger status and air alcohol detection. Background Art

[0002] Drunk driving is one of the leading causes of road accidents worldwide, seriously endangering public safety. Existing solutions mainly include:

[0003] 1. Breathalyzer interlock: Requires the driver to blow into a device before starting. Disadvantages: Only for designated drivers, the process is cumbersome and time-consuming, and can be circumvented (e.g., someone else blowing on your behalf).

[0004] 2. In-car air alcohol detection: Monitors the overall alcohol concentration in the vehicle. Disadvantages: Unable to distinguish the source of alcohol (driver, passenger, or belongings). Passenger alcohol or volatile objects may lead to misjudgment, making it difficult to accurately determine the driver's condition.

[0005] 3. Camera-based driver behavior analysis: This technology uses facial recognition or behavioral characteristics (such as closing eyes or nodding) to identify driver fatigue or drunk driving. Disadvantages: Accuracy is affected by lighting and obstructions, making it difficult to effectively identify alcohol-affected drivers before they start driving.

[0006] Therefore, there is an urgent need for a more accurate, automated, integrated and difficult-to-avoid drunk driving prevention device and method that can actively intervene before or after the vehicle starts to effectively prevent the occurrence of drunk driving. Summary of the Invention

[0007] In response to the problems existing in the prior art, the present invention provides a system and method for preventing drunk driving based on passenger status and air alcohol detection.

[0008] The present invention is implemented as follows: a vehicle drunk driving prevention system based on passenger status and air alcohol detection, the system comprising:

[0009] Alcohol concentration detection module, including alcohol sensors in the driver area and alcohol sensors in the common area / passenger area of ​​the vehicle;

[0010] Occupant status detection module, including seat sensors and cameras;

[0011] The central control unit is connected to the alcohol concentration detection module, the occupant status detection module, the active breath retest module, the actuator, and the warning device, and is installed under the vehicle dashboard;

[0012] Active exhalation retest module, integrated into the steering wheel solution, or designed as an independent small handheld or fixed mouthpiece;

[0013] Actuator, access to the original start button circuit, TCU or ECU, send "limit start / run" instructions through the relay or control signal harness;

[0014] Early warning device, using the original vehicle dashboard display, horn, audio system.

[0015] Further, the alcohol sensor of the driver area is integrated into the surface of the steering wheel in a specific position, such as the thumb holding area, with an embedded breath detection port and alcohol sensor, and assisted by a miniature fan / air pump to guide the airflow near the driver's mouth and nose; The alcohol sensor in the public area / passenger area of the vehicle is installed in the roof control panel area or the rearview mirror back shell.

[0016] Further, the seat sensor is installed with a thin film pressure sensor array under all seat cushions, which can distinguish weight and pressure distribution to determine whether there is a person or a heavy object; The key is to accurately identify whether there is a person in the driver's seat; The camera is installed with a wide-angle camera at the inside rearview mirror, which is used for passenger counting and position judgment, driver face recognition, and basic behavior observation.

[0017] 4. The automobile drunk driving prevention system based on passenger state and air alcohol detection according to claim 1, wherein the central control unit receives data from the passenger state detection module and the alcohol concentration detection module, and the specific functions include:

[0018] Confirming the presence and identity of the driver, if identified, analyzing the alcohol concentration in the driver area: if the concentration is below the preset safety threshold, it is considered safe; If the concentration is at an intermediate level: in combination with the passenger state: if there is no passenger or the passenger has not been detected to drink, trigger the early warning; Or ask the driver to use the active breath retest module for short-term active breath retest; If the concentration is continuously higher than the high-risk threshold: especially when the concentration is detected to be rapidly increased in a short time near the driver's mouth and nose, it strongly indicates that the driver is in a drunk driving state;

[0019] In combination with the passenger state: if there is a passenger and the passenger area detects a higher alcohol concentration, while the driver area has a lower and stable concentration, it is more likely that the passenger is drinking rather than the driver, avoiding the misjudgment of the driver area's short-term environmental concentration increase, and the system focuses more on the changes in the driver area.

[0020] Further, the early warning specifically includes:

[0021] Primary warning: dashboard or voice prompt "detecting alcohol traces, please confirm safe driving" or "please actively perform breath confirmation";

[0022] Advanced warning / start limit:

[0023] Prohibit vehicle start: When the driver attempts to start the vehicle, the system cuts off the starting circuit, locks the transmission, or prevents the engine ignition control unit from working. Continuous warning: The vehicle cannot start and emits strong sound and light warnings, such as a flashing red light on the instrument panel, a short horn beep, and a voice warning.

[0024] Driving Warning: If the vehicle detects a sudden and abnormal increase in the driver's alcohol concentration while in motion, or if the threshold is set higher at startup, a continuous strong warning will be triggered, including steering wheel vibration, seat belt pre-tensioning, a flashing red instrument panel, a warning sound, and a voice reminder to pull over. The event can also be recorded or relevant parties, such as fleet management platforms, can be notified through the Internet of Vehicles, subject to privacy regulations.

[0025] Automatic safety handling: When the risk is extremely high and the vehicle has advanced autonomous driving functions, the system can be linked to automatic parking or emergency side parking functions.

[0026] Another object of the present invention is to provide a method for preventing drunk driving based on passenger status and air alcohol detection based on the vehicle drunk driving prevention system based on passenger status and air alcohol detection, the method specifically comprising:

[0027] S1: Vehicle power-on / door lock open trigger: When the vehicle detects that the door is unlocked, opened, or the brake is pressed, the system starts self-checking and preheating.

[0028] S2: Occupant Status Detection: Seat sensors detect the presence and approximate weight of each seat. The core confirms whether the driver's seat is occupied; the camera cooperates to detect the number and position of passengers. If driver identification is enabled, the camera attempts to identify the driver's seat occupant.

[0029] S3: Driver Area Alcohol Concentration Monitoring: Continuously / periodically sample the air in the driver area; analyze the concentration value and its rate of change; focus on whether the concentration rises rapidly within a short period of time;

[0030] S4: Alcohol concentration monitoring in public areas of the vehicle: Continuously / periodically sample the air in public areas as a reference for environmental background and to assist in determining whether passengers have been drinking.

[0031] S5: Risk Assessment and Decision Making:

[0032] Case A: Driver present and identity matched, concentration in driver area is below Level A threshold: Start allowed, no alarm.

[0033] Case B: The driver is present and the concentration in the driver's area is between the AB thresholds: the primary warning (5) is triggered, and a warning message is displayed; the driver is required to perform an active breath re-examination; if the re-examination is passed or the driver does not operate within the specified time, the start is allowed; if the re-examination fails, the process goes to Case C.

[0034] Case C1: The driver is present and the concentration in the driver's area is higher than the Class C threshold: high-risk drunk driving is determined.

[0035] Case C2: The driver is present, the concentration in the driver's area is higher than the Class C threshold, and the concentration in the public area is lower: further strengthening the judgment that the driver is drinking;

[0036] Case D: The driver is present, the concentration in the public area is high but the concentration in the driver's area is low and stable: the risk is judged to be low, and the passenger may have been drinking; the start is allowed, and a mild prompt is optional.

[0037] S6: Execute response:

[0038] For situations A and D: Remove restrictions and allow the vehicle to start normally.

[0039] For situation B where re-inspection is not required or passed: the restriction is lifted and the startup is allowed. The warning may stop automatically or last for a short time.

[0040] For case B, re-inspection is required and failed or case C: Start prohibited: the limit actuator is activated and the vehicle cannot be ignited or shifted into gear.

[0041] Trigger advanced warning: strong sound, light and voice prompts the driver to be in a drunk driving state, and the vehicle is locked;

[0042] The system enters a delayed state, such as automatically rechecking after 5-15 minutes, or requiring the key to be powered off and then on again for rechecking, or being forced to wait for a longer time;

[0043] S7: Driving monitoring:

[0044] After activation, the driver area sensor (3a) monitors continuously.

[0045] If the alcohol concentration detected exceeds the programmed driving threshold continuously, may be slightly above the C-level threshold before activation, or may suddenly increase significantly:

[0046] Immediately trigger the highest level of continuous alarm, instrument panel, sound, vibration, etc.;

[0047] Record events, time, location, and concentration data;

[0048] Send warning information through the Internet of Vehicles;

[0049] The system attempts to control the vehicle to automatically and safely pull over.

[0050] Another object of the present invention is to provide a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the automobile drunk driving prevention method based on occupant status and air alcohol detection.

[0051] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, enables the processor to execute the steps of the method for preventing drunk driving based on passenger status and air alcohol detection.

[0052] Another object of the present invention is to provide an information data processing terminal, which is used to implement the automobile drunk driving prevention system based on passenger status and air alcohol detection.

[0053] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0054] The system first uses a near-field electrochemical sensor on the steering wheel and dual-modal positioning with a seat-mounted camera to locate the driver's breathing zone in real time and determine the cabin's baseline concentration, forming a "local-global" comparison framework. This structure accurately identifies transient alcohol fluctuations on the driver's side, reducing the error in the passenger's background alcohol consumption to less than 1%, effectively eliminating misjudgments caused by average overall concentrations.

[0055] The detection process is completed silently within the natural cycle of unlocking the door, taking the seat, and starting the vehicle, without the driver having to blow air or provide additional confirmation. Once the thin-film pressure array reports seat occupancy, the first alcohol sensor begins targeted sampling. This entire process is imperceptible to the user, virtually eliminating the opportunity for deliberate detection evasion.

[0056] The central control unit completes risk assessment before driving: when the local concentration reaches the warning curve gradient threshold, the system immediately cuts off the starting circuit or locks the shift mechanism, intercepting potential drunk driving before the engine ignites; for minor fluctuations that only touch the warning range, the driver is reminded to perform a short breath re-examination through a voice-instrument combination, reducing risks at the source without increasing operational stagnation.

[0057] The decision-making engine employs three levels of dynamic response: green channel allows immediate release; yellow channel triggers timed re-inspection; and red channel triggers audible, visual, vibration, and network-connected alerts, along with driving or travel restrictions. This tiered strategy precisely matches risk levels, preventing misuse that could disrupt normal travel while uncompromisingly interrupting the vehicle's power train in high-risk scenarios.

[0058] All sensor nodes are connected to the vehicle's electrical and electronic architecture via CAN-FD or automotive Ethernet, sharing power and data buses with existing ECUs. Image and biometric raw frames are feature-vectorized and anonymized within the vehicle's SoC, ensuring sensitive information never leaves the vehicle. The entire hardware requires only standard connectors for integration, ensuring cost and process efficiency are compatible with OEMs' mass production paths. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a kind of automobile drunk driving prevention system structure based on passenger state and air alcohol detection provided by the embodiment of the present application;

[0060] Figure 2 is the flow chart of the early warning method provided by the embodiment of the present application;

[0061] Figure 3 is the flow chart of the automobile drunk driving prevention method based on passenger state and air alcohol detection provided by the embodiment of the present application;

[0062] Figure 4 is the circuit diagram of the central control unit provided by the embodiment of the present application;

[0063] In the figure: 1, alcohol concentration detection module; 2, passenger state detection module; 3, central control unit; 4, active exhalation recheck module; 5, actuator; 6, early warning device. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical scheme and advantages of the present application clearer and more apparent, the present application will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0065] The existing vehicle-mounted drunk driving prevention device mainly relies on single-point semiconductor alcohol sensor or forced blowing module. The former often misjudges due to non-uniform air convection in the vehicle, passenger drinking interference and driver exhaled gas dilution and other factors. The latter is rejected by large-scale deployment of commercial vehicle fleets in actual operation scenarios due to the tedious blowing steps and high sensor maintenance cost. The present application combines the near-field electrochemical fuel cell sensor of the steering wheel and the background sensor of the overhead control panel through the "driver local-vehicle cabin background" dual-domain sampling strategy, so that the detection result has both position sensitivity and environmental reference, realizing the rapid capture of the real exhaled alcohol concentration of the driver and the discrimination and isolation of the passenger drinking background.

[0066] In the industrialization process, reliably confirming the driver's identity is always the key to reducing the probability of false locking. The system deploys a two-dimensional strain bridge array under each seat, which not only performs pattern recognition on load distribution, but also multi-modal fusion with human skeleton features collected by the wide-angle camera of the inside rearview mirror, outputting a confidence factor of "there is someone in the driver's seat and the identity is reliable". The confidence factor and the alcohol detection curve are synchronized into the decision engine to form a closed loop calibration, cutting off the false alarm path of "passenger drinking leading to temporary pollution of the driver's area" from the source.

[0067] At the algorithm level, the application introduces a double criterion of segmented linear threshold and time differential gradient threshold: when the local concentration curve slope exceeds the preset critical value within a two-second time window while the background concentration remains stable, a high-risk label can be triggered; if the curve stays in the middle interval, a background increment coefficient is calculated according to the number of passengers and seat distribution, and then it is determined whether to enter the secondary blowing review process. The multi-factor fusion model is verified by dynamic cabin circulating wind tunnel test, and the false positive rate is reduced from 7.2% of the traditional single threshold scheme to 1.4%.

[0068] To solve the pain points of traditional blowing device, such as large volume and low user acceptance, the system adopts an embedded active exhalation reinspection module: a four-blade cross-flow micro fan is arranged behind the sunken blowout on the steering wheel to form a directional negative pressure channel, which is matched with a micro platinum catalytic fuel cell sensor to complete sampling and steady-state reading within two seconds. The blowout is integrally injection molded with medical-grade polycarbonate and can be disinfected, meeting the dual needs of durability and hygiene for high-turnover commercial vehicles.

[0069] The control execution link is designed through ISO 26262 ASIL-B level, the relay normally closed end is connected in series with the starting button ignition line and the electronic gear shifting interlock, and the bus side publishes functional safety level events to the ECU and TCU. If it is determined to be high-risk drunk driving, the system cuts off the ignition permission within 0.3 seconds and triggers the instrument full red flashing and the buzzer interactive warning; if the vehicle is in a driving state, it sends the “torque reduction-keep lane-pre-tighten safety belt” progressive instructions to the brake control unit through CAN FD, and if necessary, it links the L2+ level automatic parking module to complete safe parking.

[0070] To meet the needs of fleet management and insurance risk control, the central control unit also uploads the judgment result, alcohol concentration curve, GPS coordinates and driver face vector hash value to the cloud platform after encryption, forming a traceable event chain. Based on this architecture, manufacturers can configure thresholds, strategies and remote OTA upgrades by vehicle model; the whole system is compatible with existing CAN wire harness and LIN peripherals, and can be integrated without changing the underlying calibration process of the OEM, thereby achieving an engineering balance between cost, reliability and regulatory compliance.

[0071] The embodiment of the application provides a car drunk driving prevention system based on passenger state and air alcohol detection, which comprises:

[0072] An alcohol concentration detection module 1 comprising an alcohol sensor in the driver area and an alcohol sensor in the public area / passenger area in the vehicle;

[0073] A passenger state detection module 2 comprising a seat sensor and a camera;

[0074] The central control unit 3 is connected to the alcohol concentration detection module 1, the occupant status detection module 2, the active breath re-test module 4, the actuator 5, and the warning device 6, and is installed under the vehicle dashboard;

[0075] Active exhalation retest module 4, integrated into the steering wheel solution, or designed as an independent small handheld or fixed mouthpiece;

[0076] Actuator 5 is connected to the vehicle's original start button circuit, transmission control unit TCU or engine control unit ECU through a relay or control signal harness to send a "restricted start / run" command;

[0077] The early warning device 6 utilizes the vehicle's original instrument panel display, speaker, and audio system.

[0078] The alcohol sensor in the driver's area is integrated into a specific position on the steering wheel surface, such as the thumb grip area, with an embedded breath detection port and alcohol sensor, and supplemented by a micro fan / air pump to guide the airflow near the driver's mouth and nose; the alcohol sensor in the public area / passenger area of ​​the vehicle is installed in the roof control panel area or the back shell of the rearview mirror.

[0079] The seat sensor is equipped with a thin film pressure sensor array under all seat cushions, which can distinguish weight and pressure distribution and determine whether there is a person or heavy object; the key is to accurately identify whether there is someone in the driver's seat; the camera is equipped with a wide-angle camera at the rearview mirror for passenger counting and position judgment, driver facial recognition, and basic behavior observation.

[0080] The central control unit receives data from the passenger status detection module and the alcohol concentration detection module, and its specific functions include:

[0081] Confirm the driver's presence and identity. If recognized, analyze the alcohol concentration in the driver's area. If the concentration is below the preset safety threshold, it is considered safe. If the concentration is at an intermediate level, consider the occupant status. If there are no passengers or the passengers show no signs of drinking, trigger an early warning. Alternatively, require the driver to perform a short active breath retest using the active breath retest module. If the concentration is continuously above the high-risk threshold, especially if the concentration is detected to rise sharply in a short period of time near the driver's mouth and nose, it strongly indicates that the driver is driving under the influence.

[0082] Combined with passenger status: If there is a passenger and a high alcohol concentration is detected in the passenger area, while the concentration in the driver area is low and stable, it is more likely that the passenger is drinking rather than the driver. This avoids misjudging the short-term increase in environmental concentration in the driver area, and the system focuses more on changes in the driver area.

[0083] like Figure 2 As shown, the warning specifically includes:

[0084] Primary warning: Instrument panel or voice prompts "Alcohol traces detected, please confirm safe driving" or "Please take the initiative to confirm the breathalyzer";

[0085] Advanced warning / startup restrictions:

[0086] Prohibit vehicle start: When the driver attempts to start the vehicle, the system cuts off the starting circuit, locks the transmission, or prevents the engine ignition control unit from working. Continuous warning: The vehicle cannot start and emits strong sound and light warnings, such as a flashing red light on the instrument panel, a short horn beep, and a voice warning.

[0087] Driving Warning: If the vehicle detects a sudden and abnormal increase in the driver's alcohol concentration while in motion, or if the threshold is set higher at startup, a continuous strong warning will be triggered, including steering wheel vibration, seat belt pre-tensioning, a flashing red instrument panel, a warning sound, and a voice reminder to pull over. The event can also be recorded or relevant parties, such as fleet management platforms, can be notified through the Internet of Vehicles, subject to privacy regulations.

[0088] Automatic safety handling: When the risk is extremely high and the vehicle has advanced autonomous driving functions, the system can be linked to automatic parking or emergency side parking functions.

[0089] like Figure 3 As shown, an embodiment of the present invention provides a method for preventing drunk driving based on passenger status and air alcohol detection based on the vehicle drunk driving prevention system based on passenger status and air alcohol detection, the method specifically comprising:

[0090] S1: Vehicle power-on / door lock open trigger: When the vehicle detects that the door is unlocked, opened, or the brake is pressed, the system starts self-checking and preheating.

[0091] S2: Occupant Status Detection: Seat sensors detect the presence and approximate weight of each seat. The core confirms whether the driver's seat is occupied; the camera cooperates to detect the number and position of passengers. If driver identification is enabled, the camera attempts to identify the driver's seat occupant.

[0092] S3: Driver Area Alcohol Concentration Monitoring: Continuously / periodically sample the air in the driver area; analyze the concentration value and its rate of change; focus on whether the concentration rises rapidly within a short period of time;

[0093] S4: Alcohol concentration monitoring in public areas of the vehicle: Continuously / periodically sample the air in public areas as a reference for environmental background and to assist in determining whether passengers have been drinking.

[0094] S5: Risk Assessment and Decision Making:

[0095] Case A: Driver present and identity matched, concentration in driver area is below Level A threshold: Start allowed, no alarm.

[0096] Case B: The driver is present and the concentration in the driver's area is between the AB thresholds: the primary warning (5) is triggered, and a warning message is displayed; the driver is required to perform an active breath re-examination; if the re-examination is passed or the driver does not operate within the specified time, the start is allowed; if the re-examination fails, the process goes to Case C.

[0097] Case C1: The driver is present and the concentration in the driver's area is higher than the Class C threshold: high-risk drunk driving is determined.

[0098] Case C2: The driver is present, the concentration in the driver's area is higher than the Class C threshold, and the concentration in the public area is lower: further strengthening the judgment that the driver is drinking;

[0099] Case D: The driver is present, the concentration in the public area is high but the concentration in the driver's area is low and stable: the risk is judged to be low, and the passenger may have been drinking; the start is allowed, and a mild prompt is optional.

[0100] S6: Execute response:

[0101] For situations A and D: Remove restrictions and allow the vehicle to start normally.

[0102] For situation B where re-inspection is not required or passed: the restriction is lifted and the startup is allowed. The warning may stop automatically or last for a short time.

[0103] For case B, re-inspection is required and failed or case C: Start prohibited: the limit actuator is activated and the vehicle cannot be ignited or shifted into gear.

[0104] Trigger advanced warning: strong sound, light and voice prompts the driver to be in a drunk driving state, and the vehicle is locked;

[0105] The system enters a delayed state, such as automatically rechecking after 5-15 minutes, or requiring the key to be powered off and then on again for rechecking, or being forced to wait for a longer time;

[0106] S7: Driving monitoring:

[0107] After activation, the driver area sensor (3a) monitors continuously.

[0108] If the alcohol concentration detected exceeds the programmed driving threshold continuously, may be slightly above the C-level threshold before activation, or may suddenly increase significantly:

[0109] Immediately trigger the highest level of continuous alarm, instrument panel, sound, vibration, etc.;

[0110] Record events, time, location, and concentration data;

[0111] Send warning information through the Internet of Vehicles;

[0112] The system attempts to control the vehicle to automatically and safely pull over.

[0113] As Figure 4 shown, the central control unit circuit is based on two power supplies and five signal buses: N2.+ / N2.- are the constant power supply and ground bus isolated by a fuse, 35.+ is the controlled power supply after ignition, and 5.6 and 7.0-7.3 are sensor and actuator signal channels. The steering wheel near-field alcohol sensor is input through the 7.1.8 socket, and the millivolt-level signal amplification is completed by the differential operational amplifier; the amplitude is sent to the analog-to-digital converter and the hardware threshold comparator at the same time, ensuring that the lowest level of hard break protection can be implemented when the MCU has not yet been powered on.

[0114] A 32-bit processor and an external NOR Flash are arranged downstream of the signal conditioning module, storing the real-time operating system kernel, decision logic, and vehicle adaptation parameters. The processor completes self-checking and verification after receiving power from 35.+, and then performs fusion operations on the seat strain array, camera depth frame, and dual-domain alcohol concentration according to the S1-S7 process; when the threshold is triggered, the GPIO pulls off the start button low-voltage side through the 1.5.8 relay coil, or issues a "NO-CRANK" frame to the ECU through CAN-FD, realizing double-channel functional safety isolation.

[0115] The above hardware platform also constitutes the physical carrier of the computer equipment of the present application. The embedded memory is divided into a boot area, an application area, and an OTA buffer area, and stores a set of computer programs for implementing the drunk driving prevention method based on the occupant state and air alcohol detection; after the processor calls the program, it can complete the complete steps of occupant identification, concentration curve gradient analysis, hierarchical response determination, and actuator driving in sequence.

[0116] To ensure version consistency in the production line and after-sales links, the computer program is also packaged in a computer-readable storage medium, such as an eMMC, U-Disk, or SD-card image. The host factory can write the medium content to the central control unit through a mass production burning station or remote OTA, in order to quickly deploy algorithm updates or vehicle model differentiation strategies without disassembling the vehicle harness.

[0117] The information data processing terminal is composed of a central control unit, a steering wheel blow recheck module, and a roof background sensor network. The internal Ethernet-TSN exchange node is responsible for high-speed forwarding of tensor data between the camera and the deep learning coprocessor; the low-speed CAN-FD branch transmits the seat pressure matrix and alcohol ratio signal. The terminal also has a built-in TLS-1.3 stack, which can upload the concentration curve and GPS marker to the fleet management platform through the cellular network encryption when a red-level event is triggered.

[0118] Through Figure 4The illustrated hardware circuit works in conjunction with the above-mentioned software. The present invention implements a closed-loop link from sensor acquisition, algorithm decision-making to safe execution within the E / E architecture of mass-produced automobiles, maintaining the controllability of wiring and BOM costs while achieving pre-emptive interception and full-process monitoring of drunk driving risks.

[0119] It should be noted that the embodiments of the present invention can be implemented by hardware, software, or a combination of software and hardware. The hardware portion can be implemented using dedicated logic; the software portion can be stored in a memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated design hardware. Those skilled in the art will appreciate that the above-mentioned devices and methods can be implemented using computer-executable instructions and / or contained in processor control code, for example, such as a carrier medium such as a disk, CD or DVD-ROM, a programmable memory such as a read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The devices and modules of the present invention can be implemented by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., can also be implemented by software executed by various types of processors, or can be implemented by a combination of the above-mentioned hardware circuits and software, such as firmware.

[0120] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with this technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection of the present invention.

Claims

1. A car drunk driving prevention system based on passenger status and air alcohol detection, characterized in that: The system comprises: An alcohol concentration detection module is provided with a first alcohol sensor for detecting the alcohol concentration of the air in the driver's area and a second alcohol sensor for detecting the alcohol concentration of the air in the passenger common area; The occupant status detection module is equipped with a thin film pressure sensor array installed under each seat cushion and a wide-angle camera installed on the interior rearview mirror; The central control unit is connected to the alcohol concentration detection module, the occupant status detection module, the active breath retest module, the actuator and the early warning device, and is used to make comprehensive judgments on the monitoring data and output control instructions; Active breath retest module, which can receive retest instructions from the central control unit and test the driver's breath alcohol concentration; an actuator electrically connected to a vehicle start button circuit, a transmission control unit, or an engine control unit, for disconnecting a control circuit for starting the vehicle or shifting gears upon receiving a restricted start or restricted run command; The early warning device uses the vehicle's dashboard, onboard audio and speakers to output visual and auditory warning information.

2. The automobile drunk driving prevention system according to claim 1, characterized in that: The first alcohol sensor is integrated into the thumb grip area of ​​the steering wheel surface and has a built-in breath detection port. The breath detection port guides the airflow near the driver's mouth and nose into the first alcohol sensor through a micro fan.

3. The automobile drunk driving prevention system according to claim 1, characterized in that: The thin film pressure sensor array can distinguish different pressure distributions to determine whether each seat is occupied and whether the driver's seat is occupied.

4. The automobile drunk driving prevention system according to claim 1, characterized in that: The central control unit is configured with a first threshold, a second threshold, and a third threshold. The central control unit makes the following decisions based on the comparison of the detection value of the first alcohol sensor with the thresholds and in combination with the occupant status information: When the detection value is lower than a first threshold, the vehicle is allowed to start; When the detection value is between the first threshold and the second threshold, a primary warning is issued and the active exhalation re-test module is triggered; When the detection value is higher than the third threshold, a limit start instruction is output and a high-level warning is issued.

5. A method for preventing drunk driving based on the system according to any one of claims 1 to 4, characterized in that: The method comprises: The vehicle performs self-inspection and preheating after powering on; Collect seat pressure sensor and camera data to confirm the driver is in place and identify the number of passengers; Continuously collecting detection values ​​of the first alcohol sensor and monitoring its rate of change; Collect the detection value of the second alcohol sensor as the background concentration in the vehicle; Perform risk assessment and generate a decision based on the detection value and the first threshold, the second threshold, and the third threshold; Based on the decision results, the actuator and warning device are controlled to allow start-up, require breath retest, restrict start-up or issue an alarm during driving.

6. The method according to claim 5, characterized in that If the risk assessment result requires a breath retest, the central control unit sends a retest instruction to the active breath retest module. If the retest is passed within the specified time, the start restriction is lifted. If the retest fails, the restriction remains and the delayed retest process begins.

7. A central control unit, characterized in that: The central control unit includes: processor; a memory storing an instruction set for risk assessment and a first threshold, a second threshold, and a third threshold; Multi-channel data interface, used to receive data from the alcohol concentration detection module and the occupant status detection module and send control instructions to the actuator, active breath retest module and early warning device; The processor is configured to execute the instruction set to generate vehicle starting and driving safety control instructions according to the received data.

8. The central control unit according to claim 7, characterized in that: The central control unit is further configured to record the event time, location and detection data when a high-risk state above a third threshold is detected, and transmit the data to the remote management platform via the vehicle communication network.

9. An active exhalation re-examination module, characterized in that: The module is integrated into the steering wheel and includes an air blowing channel, an alcohol detection sensor and a micro fan for guiding airflow. The module can start the air blowing detection under the instruction of the central control unit and transmit the detection results back to the central control unit.

10. The active exhalation retest module according to claim 9, characterized in that: The module also includes a detachable mouthpiece and a status indicator light to inform the driver of the blowing status and test results.

Images