JP5214924B2 - Drunk driving prevention system - Google Patents

Description

The present invention relates to the drunk driving prevention system for preventing drunk driving or drunk driving, etc. by the driver of the vehicle.

  Driving drunk or drunk driving vehicles is extremely dangerous and prohibited by law. However, even in recent years, accidents associated with drunk driving or drunk driving are constantly becoming a social problem. For this reason, it is required to use a device for measuring the influence of the alcohol of the driver, and to install a function for prohibiting the vehicle from running when the alcohol is detected by the driver. For example, a vehicle equipped with a drunk driving prevention system that detects alcohol contained in a driver's exhalation and prohibits the vehicle from traveling by controlling whether or not to start the engine according to the detection result has been put into practical use.

  In the conventional drunk driving prevention system, for example, in order to detect alcohol from the exhalation of the driver, an insufflation pipe for the driver to inject exhalation in addition to the mouth is mounted on an instrument panel or a seat belt. There is also a drunk driving prevention system in which a sensor that detects alcohol from sweat or the like is mounted on an instrument panel or a handle when the driver touches the hand.

  However, these drunk driving prevention systems need to be provided with an insufflation pipe or a sensor on the instrument panel, but in recent vehicles, various devices such as a car navigation device, an audio device, a back camera, and a side camera are included. Since a switch or button for operating these devices is installed on the instrument panel, there is a problem that it is difficult to secure a space for installing the insufflation pipe or sensor of the drunk driving prevention system. is there. Further, even when the blowing pipe or sensor is arranged on the seat belt or the handle, it is necessary to notify the ECU (Electronic Control Unit) mounted on the vehicle of the alcohol detection result by the blowing pipe or the sensor. Therefore, there is a problem that it is difficult to secure a space for arranging the communication cable in the vehicle because it is necessary to connect the blow pipe or the sensor and the ECU with the communication cable.

Patent Document 1 proposes a key device with a drunk driving prevention and anti-theft function capable of preventing the drunk driving and theft prevention of an automobile by the function of the automobile key itself. In this key device, a key for an automobile is projected and retracted from the key holder body, and means for detecting fingerprints and alcohol concentration is provided on the key holder body. When it matches the pre-registered fingerprint and the alcohol concentration is below the reference value, the vehicle key can be used by protruding from the key holder body, thereby preventing drunk driving and theft prevention.
JP 2004-169524 A

  Since the key device described in Patent Document 1 is provided with means for detecting fingerprints and alcohol concentration in the key holder body, it does not occupy a space such as an instrument panel and it is difficult to secure the above-described arrangement space. Can be solved. Further, in the conventional drunk driving prevention system, for example, in the case of a configuration in which exhalation is blown into the above-described blowing pipe, it is possible to avoid detection of alcohol by blowing exhalation into the blowing pipe by a person other than the driver. However, since the key device described in Patent Document 1 has a function of collating fingerprints, it is difficult for others other than the driver to avoid alcohol detection.

  However, since the key device described in Patent Document 1 needs to register the driver's fingerprint data in advance, it is difficult for others who have not registered the fingerprint data to use the vehicle. For this reason, there exists a problem that it cannot apply to the vehicle which unspecified many people use, such as a rental car, for example.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide wireless communication between a portable communication device having alcohol concentration detection means and a communication device within a predetermined range in the vehicle. The vehicle-mounted wireless communication device controls the vehicle based on the alcohol concentration detection result transmitted by the communication device within a predetermined range in the vehicle using the vehicle-mounted wireless communication device that performs communication to control whether or not the vehicle can travel. It is an object of the present invention to provide a drunk driving prevention system that does not require any alcohol concentration detection means in a vehicle and does not occupy a limited space such as an instrument panel.

  Another object of the present invention is that the in-vehicle wireless communication device communicates with a portable communication device in a range including the driver's seat of the vehicle but not including other seats, and acquires the detection result of the alcohol concentration. By providing a configuration, an object of the present invention is to provide a drunk driving prevention system capable of acquiring a detection result of alcohol concentration from a communication device possessed by a driver sitting in a driver's seat and detecting the alcohol concentration of the driver. .

  Another object of the present invention is that the communication device detects alcohol concentration only within a range in which communication with the in-vehicle wireless communication device can be performed, so that a limited range such as a driver's seat is provided. An object of the present invention is to provide a drunk driving prevention system capable of reliably detecting the alcohol concentration of a driver by detecting only in the vehicle.

  Another object of the present invention is that the in-vehicle wireless communication apparatus transmits an LF (Low Frequency) wave within a predetermined range, and the communication device is within the predetermined range depending on whether or not the radio wave is received. It is in providing the drunk driving prevention system which can implement | achieve the detection of the alcohol concentration in the limited range simply and reliably by setting it as the structure which determines whether it exists.

  Another object of the present invention is that the in-vehicle wireless communication device requests transmission of the alcohol concentration detection result to the communication device, and determines whether the alcohol concentration exceeds an allowable value from the received detection result. An object of the present invention is to provide a drunk driving prevention system capable of reliably preventing a vehicle from being driven by a driver who has consumed alcohol by controlling the vehicle so that the vehicle cannot be driven when an allowable value is exceeded. .

  Another object of the present invention is to control whether or not the engine of the vehicle can be started according to the detection result of the alcohol concentration, thereby ensuring that the vehicle is detected when the detected alcohol concentration exceeds an allowable value. It is an object of the present invention to provide a drunk driving prevention system that can make driving impossible.

The drunk driving prevention system according to the first aspect of the present invention has a communication means for performing wireless communication and a detection means for detecting the alcohol concentration of the owner, and a portable communication for transmitting a detection result of the detection means by the communication means. A vehicle, a communication unit that is mounted on the vehicle and wirelessly communicates with the communication device within a predetermined range in the vehicle, and a travel that controls whether the vehicle travels according to the detection result transmitted from the communication device. An in-vehicle wireless communication device having a control means , wherein the predetermined range includes a driver's seat of the vehicle and does not include other seats .

  In the present invention, the portable communication device is provided with means for detecting the alcohol concentration. The vehicle is equipped with an in-vehicle wireless communication device that communicates with a communicator within a predetermined range in the vehicle to acquire a detection result of the alcohol concentration and controls whether the vehicle can travel according to the detection result. It is not necessary to provide a means for detecting the alcohol concentration in the vehicle, and since the communication device and the in-vehicle wireless communication device perform wireless communication, a limited space such as an instrument panel of the vehicle may be occupied by the drunk driving prevention system. In addition, the problem of insufficient installation space can be solved. In addition, when transmitting and receiving alcohol concentration detection results, the communication range between the communication device and the in-vehicle wireless communication device is limited to a predetermined range, so the communication range is within a range where a driver exists such as in the vicinity of the driver's seat of the vehicle. By limiting this, it is possible to control whether or not the vehicle can travel by receiving the alcohol concentration detection result for the driver.

  In the present invention, the communication range in which the alcohol concentration detection result is transmitted and received between the communication device and the in-vehicle wireless communication device is a range that includes the driver's seat of the vehicle and does not include other seats. Thereby, the in-vehicle wireless communication device transmits and receives the detection result of the alcohol concentration to and from the communication device possessed by the driver sitting in the driver's seat. Therefore, the in-vehicle wireless communication device can acquire the detection result of the alcohol concentration of the driver from the communication device by wireless communication, and can control whether or not the vehicle can travel according to the alcohol concentration of the driver.

Further, the drunk driving prevention system according to the second invention is characterized in that the detection means of the communication device performs detection when the communication device is within the predetermined range.

  In the present invention, the communication device detects the alcohol concentration only in the communication range in which the alcohol concentration detection result is transmitted and received between the communication device and the in-vehicle wireless communication device. When the communication range is limited, for example, in the vicinity of the driver's seat of the vehicle, alcohol concentration can be detected only by the driver sitting in the driver's seat, sitting in another seat such as the passenger seat or the rear seat. Others cannot do it. Therefore, the alcohol concentration of the driver can be reliably detected by the communication device.

In the drunk driving prevention system according to the third aspect of the present invention, the communication means of the in-vehicle wireless communication device transmits LF band radio waves within the predetermined range, and the communicator receives or does not receive the radio waves. Based on the above, it is determined whether or not it exists within the predetermined range.

  In the present invention, the in-vehicle wireless communication device transmits LF band radio waves to a predetermined range. The LF band radio wave is a radio wave having a frequency of about 30 kHz to 300 kHz. By using the LF band radio wave, wireless communication is hardly affected by obstacles, and the transmission range of the radio wave is accurately adjusted or controlled. can do. The communicator can determine whether or not it exists within a predetermined range depending on whether or not the radio wave transmitted by the in-vehicle wireless communication device has been received.

In the drunk driving prevention system according to the fourth aspect of the invention, the in-vehicle wireless communication device responds to a request by the detection result request means for requesting the communication device to transmit the detection result by the communication means, and by the detection result request means. Accordingly, based on the detection result transmitted from the communication device, alcohol determination means for determining whether or not the alcohol concentration exceeds an allowable value, the travel control means is configured to determine whether the alcohol concentration is determined by the alcohol determination means. When it is determined that the vehicle has exceeded an allowable value, the vehicle is made incapable of traveling.

  In the present invention, the in-vehicle wireless communication device gives a detection result transmission request to a communication device within a predetermined range. The communication device can detect the alcohol concentration by receiving a transmission request from the in-vehicle wireless communication device, and can transmit the detection result. The in-vehicle wireless communication device that has received the detection result determines whether or not the alcohol concentration of the detection result exceeds an allowable value, and controls the vehicle so that it cannot run when the detection result exceeds the allowable value. Therefore, the in-vehicle wireless communication device can perform control according to the alcohol concentration detected in a predetermined range such as near the driver's seat.

According to a fifth aspect of the present invention, the drunk driving prevention system is characterized in that the travel control means controls whether or not the vehicle can travel by controlling whether or not the vehicle engine can be started.

  In the present invention, the in-vehicle wireless communication device controls whether or not the vehicle engine can be started. As a result, when the alcohol concentration exceeds the allowable value, the driver cannot start the vehicle engine and cannot drive the vehicle. Therefore, drunk driving or drunk driving can be prevented in advance.

  In the present invention, the transmission of the alcohol concentration detection result is requested to another device within a predetermined range. For example, when the predetermined range for communication is in the vicinity of the driver's seat of the vehicle, the in-vehicle wireless communication device can request the communication device to transmit the detection result to other devices existing in the driver's seat. The in-vehicle wireless communication device does not need to include an alcohol concentration detection unit, and the in-vehicle wireless communication device that has received the detection result can control whether or not the vehicle can travel according to the detected alcohol concentration.

  In the case of the first invention, the portable communication device is provided with means for detecting the alcohol concentration, and the in-vehicle wireless communication device communicates with the communication device within a predetermined range in the vehicle to acquire the detection result of the alcohol concentration. By adopting a configuration that controls whether or not the vehicle can run according to the detection result, it is not necessary to provide means for detecting the alcohol concentration in a limited space such as an instrument panel in the vehicle. The problem of insufficient space can be solved, and more other devices such as a car navigation device and an audio device can be provided in the vehicle. In addition, the communication range for transmitting and receiving the alcohol concentration detection result is limited to the range in which the driver exists, for example, in the vicinity of the driver's seat of the vehicle. Since the device can acquire the vehicle, it is possible to control whether or not the vehicle can travel according to the alcohol concentration of the driver, and to reliably prevent drunk driving or drunk driving.

Further, communication device and the in-vehicle wireless communication device comprises a driver's seat of the vehicle, with the structure for transmitting and receiving the detection result of the alcohol concentration in a predetermined range that does not include the other seat, vehicle wireless communication device driver seat Because the detection result can be acquired from the communication device that exists in the vehicle, that is, the communication device possessed by the driver, it is possible to reliably acquire the alcohol concentration of the driver and control whether or not the vehicle can travel, and drunk driving or drunk driving Can be prevented more reliably.

Further, in the case of the second invention, the communication range is detected only in the communication range in which the alcohol concentration detection result is transmitted and received between the communication device and the vehicle-mounted wireless communication device. For example, in the case of the vicinity of the driver's seat, the alcohol concentration can be detected only by the driver sitting in the driver's seat, and cannot be performed by others sitting in other seats such as the passenger seat or the rear seat, The in-vehicle wireless communication device can more reliably acquire the driver's alcohol concentration, and can more reliably prevent drunk driving or drunk driving.

According to the third aspect of the invention, the in-vehicle wireless communication device transmits an LF band radio wave within a predetermined range, and determines whether or not the communication device is within the predetermined range depending on whether or not the radio wave is received. By adopting the configuration, the range in which the alcohol concentration is detected can be easily and accurately limited, and the alcohol concentration of the driver can be more reliably acquired to prevent drunk driving or drunk driving.

Further, in the case of the fourth invention, by requesting transmission of a detection result to a communication device within a predetermined range and controlling whether or not the vehicle can travel based on the received detection result, A communication device that has received a transmission request within a predetermined range can detect the alcohol concentration and transmit the detection result to the in-vehicle wireless communication device. The in-vehicle wireless communication device can detect alcohol detected in a predetermined range such as the vicinity of the driver's seat. Since control according to the concentration, that is, the alcohol concentration detected from the driver sitting in the driver's seat, can be performed, drunk driving or drunk driving can be more reliably prevented.

According to the fifth aspect of the invention, the vehicle engine can be started according to the alcohol concentration detection result, so that the driver can start the vehicle engine when the alcohol concentration exceeds an allowable value. The vehicle cannot be driven because it cannot be done. Therefore, drunk driving or drunk driving can be prevented and traffic accidents can be prevented.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. 1 and 2 are block diagrams showing a configuration of a drunk driving prevention system according to the present invention. In the figure, 1 is an in-vehicle wireless communication device mounted on a vehicle 50, and 3 in the figure is a portable communication device such as a card type or a key holder type, which is possessed by a user (especially a driver). The in-vehicle wireless communication device 1 and the communication device 3 according to the present embodiment constitute a so-called smart entry system, and the in-vehicle wireless communication device 1 and the communication device 3 communicate with each other to open the door of the vehicle 50. The lock and the engine are started. For example, the driver who has the communicator 3 forming a smart key can unlock the door by touching an unlocking switch (not shown) provided on the door of the vehicle 50. The driver of the communication device 3 can start the engine of the vehicle 50 by operating the start switch 22 provided on the instrument panel of the vehicle 50.

  The drunk driving prevention system according to the present invention realizes drunk driving prevention using this smart entry system, and the communicator 3 is a gas sensor or the like that detects the alcohol concentration by blowing the breath to the driver. A configured alcohol concentration detector 36 is provided. The communicator 3 transmits the detected alcohol concentration of the driver to the in-vehicle wireless communication device 1 by wireless communication, and the in-vehicle wireless communication device 1 that has received this transmits the engine of the vehicle 50 when the alcohol concentration exceeds an allowable value. Is locked so that it cannot be started.

  The in-vehicle wireless communication device 1 includes a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, an ID (IDentifier) storage unit 14, a door lock control unit 15, an engine start control unit 16, an in-vehicle wireless communication unit 17, an in-vehicle A wireless communication unit 18, a warning unit 21, a start switch 22, and the like, and a control unit 11 that controls operations of these units are provided. Specifically, the control unit 11 is configured by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like, and by reading and executing a program and data stored in advance in the ROM 12, various control processes are performed. In addition, arithmetic processing and the like are performed.

  The ROM 12 is configured by a non-volatile memory element such as a mask ROM, an EEPROM (Electrically Erasable Programmable ROM) or a flash memory, and stores various software programs and data necessary for the operation of the in-vehicle wireless communication device 1 in advance. is there. The RAM 13 stores temporary data generated when the control unit 11 performs control processing, arithmetic processing, or the like. The RAM 13 is a data rewritable memory element such as SRAM (Static RAM) or DRAM (Dynamic RAM). It is configured.

  The ID storage unit 14 stores one ID attached to the in-vehicle wireless communication device 1 and an ID attached to each communication device 3 that performs wireless communication with the in-vehicle wireless communication device 1. When the in-vehicle wireless communication device 1 performs wireless communication with a plurality of communication devices 3, a plurality of IDs are stored in the ID storage unit 14. When the in-vehicle wireless communication device 1 transmits / receives data to / from the communication device 3, the in-vehicle wireless communication device 1 assigns an ID attached to the communication data to the transmission data and transmits it as a wireless signal. It is determined whether or not the included ID and the ID stored in the ID storage unit 14 match to determine whether or not the communication device 3 is a valid communication partner. Further, when the in-vehicle wireless communication device 1 and the communication device 3 perform wireless communication by encryption, key information for encryption may be stored in the ID storage unit 14. The ID storage unit 14 is configured by a rewritable nonvolatile memory element such as an EEPROM or a flash memory.

  Although not shown, the vehicle 50 includes a mechanical mechanism that locks and unlocks the door, a power source such as a motor or an actuator that operates the mechanical mechanism, and a drive circuit that drives the power source. A lock mechanism is installed. The door lock control unit 15 of the in-vehicle wireless communication device 1 controls the operation of the drive circuit of the lock mechanism mounted on the vehicle 50, and the vehicle 50 according to the locking command or the unlocking command given from the control unit 11. The door is locked or unlocked.

  As described above, the instrument panel of the vehicle 50 is provided with the start switch 22 for starting the engine, and the in-vehicle wireless communication device 1 communicates with the communicator 3 when the start switch 22 is operated. It is like that. After the communication between the in-vehicle wireless communication device 1 and the communication device 3 is established and the communication is completed, the control unit 11 gives a start command to the engine start control unit 16 so that the engine of the vehicle 50 is started. is there. Further, when communication between the in-vehicle wireless communication device 1 and the communication device 3 is not established, the control unit 11 does not start the engine, but gives a lock command to the engine start control unit 16 to start the engine. It locks as possible.

  The outside-vehicle wireless communication unit 17 has one or a plurality of antennas, and can transmit and receive data using wireless signals over a range of several meters to a few dozen meters around the vehicle 50. When an operation is performed on the unlocking switch provided on the door of the vehicle 50, the in-vehicle wireless communication device 1 transmits / receives data to / from the communication device 3 by the external wireless communication unit 17. After the communication between the in-vehicle wireless communication device 1 and the communication device 3 is established and the communication is completed, the control unit 11 gives an unlock command to the door lock control unit 15 so as to unlock the door of the vehicle 50. is there.

  The in-vehicle wireless communication unit 18 communicates with the communication device 3 existing in the vehicle 50. Specifically, the in-vehicle wireless communication unit 18 includes a transmission unit 19 that transmits data to the communication device 3 existing in the vehicle 50 using a wireless signal, and a reception unit that receives data transmitted from the communication device 3 using the wireless signal. 20. The transmission unit 19 transmits an LF band radio signal having a frequency of 30 kHz to 300 kHz via an antenna disposed at an appropriate position of the vehicle 50. The transmission unit 19 includes a modulation circuit that modulates transmission data supplied from the control unit 11 to generate an LF band signal, an amplification circuit that amplifies the modulated signal and transmits the signal from an antenna, and the like. In addition, in the transmission unit 19 of the in-vehicle wireless communication device 1 of the present embodiment, the transmission direction and transmission range of the LF band radio signal transmitted from the transmission unit 19 are limited, and a preset communication range An LF band radio signal is transmitted only to.

  FIG. 3 is a schematic diagram for explaining a communication range by the transmission unit 19 of the in-vehicle wireless communication device 1 according to the present invention, and schematically shows the inside of the vehicle 50 in plan view. In the vehicle 50, a driver's seat 51 is provided at the right front part, a passenger seat 52 is provided at the left front part, and a rear seat 53 is provided at the rear part. In the figure, a communication range 100 by the transmission unit 19 of the in-vehicle wireless communication device 1 is indicated by a broken line, and the communication range 100 is a range that covers the driver seat 51 in the vehicle 50, and the passenger seat 52 and the rear portion. The range that does not reach the seat 53 is set. Therefore, the communication device 3 can receive the LF band radio signal transmitted from the transmission unit 19 only when the communication device 3 exists in the vicinity of the driver seat 51, that is, the driver who owns the communication device 3 sits in the driver seat 51. The communication device 3 can receive the LF band radio signal transmitted from the transmission unit 19 only when the communication device 3 is connected.

  The receiving unit 20 receives a UHF (Ultra High Frequency) band radio signal having a frequency of about 300 to 400 MHz transmitted from the communication device 3 via an antenna disposed at a proper position of the vehicle 50. The receiving unit 20 includes an amplifier circuit that amplifies the UHF band radio signal received by the antenna, a demodulator circuit that demodulates the amplified signal and obtains transmission data from the communication device 3, and the like. The data is given to the control unit 11. The data received from the communication device 3 includes a response to the data transmitted from the transmission unit 19, the ID of the communication device 3 and the detection result by the alcohol concentration detection unit 36.

  The warning unit 21 is, for example, a warning lamp using an LED (Light Emitting Diode), and the in-vehicle wireless communication device 1 can visually give a warning to the driver. In addition, when the display of the car navigation device is mounted in the vehicle 50, the warning unit 21 may be configured to display a warning message with characters or icons on the display. Further, the warning unit 21 may be configured to issue a warning by sound output when a speaker is mounted in the car case 50. The control unit 11 determines whether or not the alcohol concentration exceeds the allowable value when the alcohol concentration detection result by the communication device 3 is received, and performs a warning by the warning unit 21 if the alcohol concentration exceeds the allowable value. is there.

  The communication device 3 includes a communication unit 32, an ID storage unit 35, an alcohol concentration detection unit 36, an operation unit 37, and the like, and a control unit 31 that controls operations of these units. Further, the communication unit 32 transmits data to the in-vehicle wireless communication device 1 mounted on the vehicle 50 using a radio signal, and receives data transmitted from the in-vehicle wireless communication device 1 to the radio signal. Part 34.

  The transmission unit 33 of the communication unit 32 transmits a UHF band radio signal to the in-vehicle wireless communication unit 17 or the in-vehicle wireless communication unit 18 of the in-vehicle wireless communication device 1 via an antenna (not shown). The transmission unit 33 has a modulation circuit for modulating the transmission data given from the control unit 31 to generate a UHF band signal, an amplification circuit for amplifying the modulated signal and transmitting it from the antenna, and the like. ing.

  The receiving unit 34 of the communication unit 32 receives an LF-band radio signal transmitted from the out-of-vehicle radio communication unit 17 or the in-vehicle radio communication unit 18 of the in-vehicle radio communication device 1 via an antenna. The receiving unit 34 has an amplification circuit that amplifies the radio signal received by the antenna, and a demodulation circuit that demodulates the amplified signal to acquire transmission data from the in-vehicle wireless communication device 1. Data is supplied to the control unit 31.

  The ID storage unit 35 stores one ID assigned to each communication device 3 and one ID assigned to the vehicle difference wireless communication device 1 with which the communication device 3 can communicate. The control unit 31 reads out the ID stored in the ID storage unit 35 and performs an authentication process, thereby performing only regular communication with the in-vehicle wireless communication device 1. Further, when the communication device 3 and the in-vehicle wireless communication device 1 perform wireless communication by encryption, key information for encryption may be stored in the ID storage unit 35. The ID storage unit 35 is configured by a rewritable nonvolatile memory element such as an EEPROM.

  For example, when the driver touches an unlocking switch provided on the door of the vehicle 50, the in-vehicle wireless communication device 1 transmits a wireless signal from the external wireless communication unit 17. When the communication device 3 possessed by the driver is within the communication range of the outside-vehicle wireless communication unit 17, the communication device 3 receives the wireless signal from the in-vehicle wireless communication device 1 by the reception unit 34 and receives the received data. The control unit 31 performs an authentication process for checking the ID of the in-vehicle wireless communication device 1 included in the control unit 31. When the authentication process is successful, the control unit 31 transmits a response notifying that the radio signal has been received, to the in-vehicle wireless communication device 1 from the transmission unit 33 by the radio signal. The in-vehicle wireless communication device 1 that has received the response from the communication device 3 performs an authentication process for checking the ID of the communication device 3 included in the received data, and unlocks the door of the vehicle 50 when the authentication is successful. It is like that.

  Moreover, the communication device 3 according to the present invention has a function of detecting the alcohol concentration from the breath of the driver. For example, a semiconductor gas sensor using tin oxide can be used as the alcohol concentration detection unit 36, and a part of the gas sensor of the alcohol concentration detection unit 36 is placed outside the communication device 3 so that the driver can blow the breath. Exposed. In clean air, oxygen is adsorbed on the surface of tin oxide, and the oxygen on the surface captures free electrons in the tin oxide, so that the current does not flow easily, that is, the resistance value increases. When the alcohol component is contained in the air, oxygen adsorbed on the surface of tin oxide reacts with the alcohol component, so that the amount of oxygen adsorbed decreases and the resistance value of tin oxide decreases. The alcohol concentration detector 36 can detect the alcohol concentration by detecting a change in the resistance value of tin oxide.

  The operation unit 37 is a button or a switch that is operated when the driver detects the alcohol concentration with the communication device 3. The driver can start detection by operating the operation unit 37, and the detection is performed by blowing exhalation to the alcohol concentration detection unit 36 at a fixed time after the operation of the operation unit 37. After a predetermined time has elapsed after the operation of the operation unit 37, the alcohol concentration detection unit 36 detects the alcohol concentration and notifies the control unit 31 of the detection result. The control unit 31 gives the detection result to the communication unit 32 as transmission data, and transmits the detection result from the transmission unit 33 to the in-vehicle wireless communication device 1 by a radio signal. Moreover, the control part 31 has memorize | stored the detection result of alcohol concentration for a fixed period, and when the transmission request | requirement of a detection result is received from the vehicle-mounted radio | wireless communication apparatus 1, it can read and transmit the memorize | stored detection result. It is like that.

  However, the communication device 3 is within the communication range (see FIG. 3) by the transmission unit 19 depending on whether or not the wireless signal from the transmission unit 19 of the in-vehicle wireless communication device 1 is received within a certain period. The alcohol concentration detector 36 detects only when it is within the communication range of the transmitter 19. That is, the alcohol concentration detection by the communication device 3 is effective only for the result performed within the communication range of the transmission unit 19, and the result performed outside the communication range is invalidated. The driver who possesses the communication device 3 may detect the alcohol concentration using the communication device 3 before and after operating the start switch 22 after sitting in the driver's seat 51 of the vehicle 50.

  The receiving unit 20 of the in-vehicle wireless communication device 1 that has received the alcohol concentration detection result from the communication device 3 is configured to give the received detection result to the control unit 11. The control unit 11 checks whether or not the detection result of the given alcohol concentration exceeds a predetermined allowable value. If the detection result exceeds the predetermined allowable value, the control unit 11 gives a lock command to the engine start control unit 16 to output the engine of the vehicle 50. Is locked so that it cannot be started. When the alcohol concentration does not exceed the allowable value, the control unit 11 gives a lock release command to the engine start control unit 16 so that the engine can be started by the start switch 22.

  4 and 5 are flowcharts showing the procedure of the lock process performed by the in-vehicle wireless communication device 1 of the drunk driving prevention system according to the present invention, and shows the processing performed by the control unit 11 of the in-vehicle wireless communication device 1. In the illustrated flowchart, the control unit 11 performs processing by changing the control state related to the lock process from three states of an alcohol concentration non-detection state, an engine start lock state, and a lock release state. is there. First, after the in-vehicle wireless communication device 1 is activated, the control unit 11 transitions to an alcohol concentration undetected state (step S1). In this state, the control unit 11 checks whether or not the start switch 22 has been operated (step S2). If the start switch 22 has not been operated (S2: NO), the control unit 11 further displays the alcohol concentration detection result from the communication device 3. It is checked whether or not the signal is received by the receiving unit 20 of the in-vehicle wireless communication unit 18 (step S3).

  When the detection result from the communication device 3 has not been received (S3: NO), the control unit 11 transmits a radio signal from the transmission unit 19 of the in-vehicle wireless communication unit 18 into the communication range 100 (step S4). It is checked whether or not a response from the communication device 3 has been received (step S5). When the response is received (S5: YES), the control unit 11 checks whether or not the alcohol concentration detection result is included in the data received as the response (step S6). When the response from the communication device 3 is not received (S5: NO), or when the received response does not include the alcohol concentration detection result (S6: NO), the control unit 11 returns to step S2 and performs the above-described processing. Is repeatedly performed.

  When the alcohol concentration detection result is received from the communication device 3 in step S3 (S3: YES), or when the alcohol concentration detection result is included in the response in step S6 (S6: YES), the control unit 11 detects It is determined whether the resulting alcohol concentration exceeds a predetermined allowable value (step S7). When the alcohol concentration exceeds the allowable value (S7: YES), the control unit 11 shifts to the locked state (step S8), gives a lock command to the engine start control unit 16 (step S9), and makes it impossible to start the engine. While locking, the warning lamp of the warning unit 21 is turned on to give a warning to the driver (step S10), and the process returns to step S2. When the alcohol concentration does not exceed the allowable value (S7: NO), the control unit 11 transitions to the unlocked state (step S11), gives an unlock command to the engine start control unit 16 (step S12), and starts the engine. Return to step S2.

  When the start switch 22 is operated in step S2 (S2: YES), the control unit 11 checks whether or not the current state is an undetected state (step S21). In the undetected state (S21: YES), the control unit 11 transmits a transmission request for the detection result of the alcohol concentration to the communication device 3 by the transmission unit 19 of the in-vehicle wireless communication unit 18 (step S22), and communication for this transmission request. It is checked whether or not the detection result from the device 3 has been received (step S23). If the alcohol concentration detection result has not been received from the communication device 3 (S23: NO), the control unit 11 returns to step S22, repeats the detection result transmission request, and waits until the detection result is received.

  If it is not in the undetected state in step S21 (S21: NO), or if the alcohol concentration detection result is received from the communication device 3 (S23: YES), the control unit 11 allows the alcohol concentration of the detection result to be determined in advance. It is determined whether or not the value is exceeded (step S24). If the alcohol concentration exceeds the allowable value (S24: YES), the control unit 11 transitions to the locked state (step S25), gives a lock command to the engine start control unit 16 (step S26), and makes it impossible to start the engine. Lock and proceed to step S29. When the alcohol concentration does not exceed the allowable value (S24: NO), the control unit 11 transitions to the unlocked state (step S27), gives an unlock command to the engine start control unit 16 (step S28), and starts the engine. The process proceeds to step S29.

  After locking the engine so that it cannot be started in step S26 or enabling the engine in step S28, the control unit 11 checks whether or not the current state is the locked state (step S29). When the control unit 11 is in the locked state (S29: YES), the warning lamp of the warning unit 21 is turned on to give a warning to the driver (step S30), and when not in the locked state (S29: NO), The engine start control unit 16 starts the engine of the vehicle 50 (step S31) and ends the process.

  FIG. 6 is a flowchart showing a communication range determination process performed by the communication device 3 of the drunk driving prevention system according to the present invention, and shows a process performed by the control unit 31 of the communication device 3. The control unit 31 of the communication device 3 is within the communication range of the in-vehicle wireless communication unit 18 depending on whether or not the wireless signal transmitted from the in-vehicle wireless communication unit 18 of the in-vehicle wireless communication device 1 is received. A process for determining whether or not it exists is performed, and a determination result that is either outside the communication range or within the communication range is held.

  First, after the communication device 3 is activated, the control unit 31 sets the determination result as the initial value outside the communication range (step S61). Thereafter, the control unit 31 checks whether or not the reception unit 34 of the communication unit 32 has received a wireless signal from the in-vehicle wireless communication unit 18 of the in-vehicle wireless communication device 1 (step S62). (S62: YES), it is determined that the communication device 3 is within the communication range (step S63), and the process returns to step S62 to repeatedly receive a radio signal.

  When the reception unit 34 does not receive a radio signal (S62: NO), the control unit 31 further checks whether or not a certain period has elapsed without receiving a radio signal (step S64). If the fixed period has not elapsed (S64: NO), the process returns to step S62 to receive a radio signal. When a certain period of time has elapsed without receiving a wireless signal (S64: YES), the control unit 31 determines that the communication device 3 is out of the communication range (step S65), and ends the process.

  FIG. 7 is a flowchart showing a procedure of alcohol concentration detection processing performed by the communication device 3 of the drunk driving prevention system according to the present invention, and shows processing performed by the control unit 31 of the communication device 3. Note that the detection process illustrated in FIG. 7 is performed using the communication range determination result according to the flowchart of FIG. 6, and the process illustrated in FIG. 6 and the process illustrated in FIG. 7 are performed in parallel. .

  First, the control unit 31 checks whether or not the communication device 3 is within the communication range of the in-vehicle wireless communication unit 18 of the in-vehicle wireless communication device 1 (step S71), and the communication device 3 is within the communication range. (S71: YES), it is checked whether or not the operation unit 37 has been operated (step S72). When the operation unit 37 is not operated (S72: NO), the control unit 31 determines whether the reception unit 34 has received a transmission request for the alcohol concentration detection result from the in-vehicle wireless communication unit 18 of the in-vehicle wireless communication device 1. (Step S73). When the transmission request has not been received (S73: NO), the control unit 31 returns to step S71, and the operation unit 37 is operated when the communication device 3 is within the communication range, or the in-vehicle wireless communication device It waits until it receives a transmission request from the in-vehicle wireless communication unit 18.

  When the transmission request of the alcohol concentration detection result is received from the in-vehicle wireless communication unit 18 of the in-vehicle wireless communication device 1 (S73: YES), the control unit 31 checks whether the alcohol concentration has been detected (step S74). If the alcohol concentration has been detected (S74: YES), the detection result is read (step S75), and the detection result is transmitted to the in-vehicle wireless communication device 1 by the transmission unit 33 (step S79), and the process returns to step S71. .

  When the alcohol concentration has not been detected (S74: NO), the control unit 31 checks whether or not the operation unit 37 has been operated (step S76), and if the operation unit 37 has not been operated (S76: NO). The operation unit 37 is on standby until it is operated. When the operation unit 37 is operated in step S72 or step S76 (S72: YES, S76: YES), the control unit 31 detects the alcohol concentration in the alcohol concentration detection unit 36 (step S77), and the detection result is obtained. After storing (step S78), the detection result is transmitted to the in-vehicle wireless communication device 1 by the transmission unit 33 (step S79), and the process returns to step S71. Thereafter, the control unit 31 repeatedly performs the above-described processing, and when it is determined in step S71 that the communication device 3 does not exist within the communication range (S71: NO), the processing ends.

  In the drunk driving prevention system configured as described above, the in-vehicle wireless communication device 1 mounted on the vehicle 50 is configured by providing the portable communication device 3 with the alcohol concentration detection unit 36 that detects the alcohol concentration of the driver. There is no need to provide means for detecting the alcohol concentration. Moreover, since the detection result of the alcohol concentration by the communication device 3 is transmitted to the in-vehicle wireless communication device 1 by wireless communication, there is no need to provide a terminal for connecting the communication device 3 to the in-vehicle wireless communication device 1 via a cable or the like. . Therefore, the drunk driving prevention system does not occupy a limited space such as an instrument panel of the vehicle 50, and there is sufficient space for arranging other devices such as a car navigation device or an audio device on the instrument panel. Can be secured.

  The in-vehicle wireless communication unit 18 of the in-vehicle wireless communication device 1 that transmits and receives the alcohol concentration detection result to and from the communication device 3 includes a driver seat 51 of a vehicle 50 as shown in FIG. By limiting the range in which the radio signal is transmitted by the transmission unit 19 to the communication range 100 that does not include the rear seat 53, the communication device 3 existing in the vicinity of the driver seat 51, that is, the driver sitting in the driver seat 51 possesses it. The vehicle-mounted wireless communication device 1 can acquire only the detection result from the communication device 3 to perform the engine start lock / unlock control.

  Further, the communication device 3 is configured to detect the alcohol concentration only when it is within the communication range 100 of the in-vehicle wireless communication device 1, so that the alcohol concentration is detected only in the vicinity of the driver seat 51. Since this is done, the alcohol concentration of the driver of the vehicle 50 can be reliably detected. Further, when the alcohol concentration detected by the communication device 3 exceeds the allowable value, the vehicle-mounted wireless communication device 1 is configured to lock the engine of the vehicle 50 so that the vehicle 50 cannot be started, so that the vehicle 50 starts running. Therefore, drunk driving or drunk driving can be surely prevented.

  In the present embodiment, the communicator 3 is configured to also serve as the smart key of the smart entry system. However, the communicator 3 is not limited to this and may be a communicator that performs communication exclusively for the drunk driving prevention system. In addition, the communication device 3 is configured to transmit the alcohol concentration detected by the alcohol concentration detection unit 36 to the in-vehicle wireless communication device 1. However, the communication device 3 is not limited to this, and the communication device 3 determines whether the alcohol concentration exceeds an allowable value. It is good also as a structure which determines whether or not and transmits only the determination result from the communication device 3 to the in-vehicle wireless communication device 1. In addition, the engine start of the vehicle 50 is locked so that the vehicle 50 cannot travel. However, the present invention is not limited to this. For example, the shift lever of the vehicle 50 may be shifted to “D (drive)”. The vehicle 50 may be configured not to travel by other methods such as prohibiting or locking the handle of the vehicle 50 so that it cannot be operated.

It is a block diagram which shows the structure of the drunk driving prevention system which concerns on this invention. It is a block diagram which shows the structure of the drunk driving prevention system which concerns on this invention. It is a schematic diagram for demonstrating the communication range by the transmission part of the vehicle-mounted radio | wireless communication apparatus which concerns on this invention. It is a flowchart which shows the procedure of the lock process which the vehicle-mounted radio | wireless communication apparatus of the drunk driving prevention system which concerns on this invention performs. It is a flowchart which shows the procedure of the lock process which the vehicle-mounted radio | wireless communication apparatus of the drunk driving prevention system which concerns on this invention performs. It is a flowchart which shows the procedure of the communication range determination process which the communication device of the drunk driving prevention system which concerns on this invention performs. It is a flowchart which shows the procedure of the detection process of the alcohol concentration which the communication device of the drunk driving prevention system which concerns on this invention performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 In-vehicle wireless communication apparatus 3 Communication device 11 Control part (detection result request means, alcohol determination means)
14 ID storage unit 15 Door lock control unit 16 Engine start control unit (running control means)
17 In-vehicle wireless communication unit 18 In-vehicle wireless communication unit (communication means)
DESCRIPTION OF SYMBOLS 19 Transmission part 20 Reception part 21 Warning part 22 Start switch 31 Control part 32 Communication part (communication means)
33 Transmission unit 34 Reception unit 35 ID storage unit 36 Alcohol concentration detection unit (detection means)
37 Control section 50 Vehicle 51 Driver's seat 52 Passenger seat (other seats)
53 Rear seat (other seats)
100 communication range (predetermined range)

Claims (5)

A portable communication device having a communication means for performing wireless communication and a detection means for detecting the alcohol concentration of the holder, and transmitting the detection result of the detection means by the communication means;
A communication unit that is mounted on a vehicle and performs wireless communication with the communication device within a predetermined range in the vehicle; and a travel control unit that controls whether the vehicle travels according to the detection result transmitted from the communication device. An in-vehicle wireless communication device having
The drunk driving prevention system, wherein the predetermined range includes a driver's seat of the vehicle and does not include other seats. The drunk driving prevention system according to claim 1, wherein the detection unit of the communication device performs detection when the communication device is within the predetermined range. The communication means of the in-vehicle wireless communication device is configured to transmit an LF (Low Frequency) wave within the predetermined range,
The drunk driving prevention system according to claim 2, wherein the communication device determines whether or not the communication device exists within the predetermined range based on whether or not the radio wave is received. The in-vehicle wireless communication device is
Detection result requesting means for requesting transmission of the detection result by the communication means to the communication device;
Alcohol determination means for determining whether the alcohol concentration exceeds an allowable value based on the detection result transmitted from the communication device in response to a request by the detection result request means;
4. The travel control means according to claim 1, wherein when the alcohol determination means determines that the alcohol concentration exceeds an allowable value, the travel control means makes the vehicle impossible to travel. The drunk driving prevention system according to any one of the above. 5. The vehicle travel control unit according to claim 1, wherein the travel control unit controls whether the vehicle can travel by controlling whether the engine of the vehicle can be started. 6. Drunk driving prevention system.

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