JP4351286B2 - In-vehicle breath alcohol measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle breath alcohol measuring apparatus capable of improving the power of suppressing fraudulence by a stand-in of a driver more than before. <P>SOLUTION: An alcohol interlock system is provided with an alcohol fuel cell sensor for measuring alcohol concentration in the breath of the driver of a vehicle, a CCD image sensor for photographing the driver in the middle of blowing the breath in, and a CPU for detecting that the vehicle is moving. The CCD image sensor photographs the driver in a step S278 when it is detected that the vehicle is moving by the CPU as well. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an on-board breath alcohol measuring apparatus that is mounted on a vehicle and measures an alcohol concentration in a driver's breath.

2. Description of the Related Art Conventionally, an on-board breath alcohol measuring device that is mounted on a vehicle and measures the alcohol concentration in a driver's breath is known (for example, see Patent Document 1).
JP-A-2005-118177

  However, in a conventional in-vehicle breath alcohol measuring device, for example, when the alcohol concentration in a driver's breath is measured in order to prevent drunk driving of a driver of a person or goods transportation industry, the alcohol is drunk. There may be fraudulent cases where a non-replaced ball receives a measurement of the alcohol concentration in the breath and a drunk driver drives the vehicle.

  An object of the present invention is to provide an in-vehicle breath alcohol measuring device capable of improving the deterrence of fraud by a driver's replacement ball than before.

An in-vehicle breath alcohol measuring device according to the present invention includes a breath alcohol measuring unit that measures the alcohol concentration in the breath of a vehicle driver, and the driver while the driver is blowing the breath. An in-vehicle breath alcohol measuring device mounted on the vehicle, the breath pressure sensor for measuring the pressure of the breath, and the pressure of the breath is a predetermined pressure a breath pressure determining means for determining based on whether at either higher the measured value of the breath pressure sensor, and a movement detection section for detecting that the vehicle is moving, the breath alcohol measuring unit, The measurement is performed when the expiratory pressure determining means determines that the expiratory pressure is equal to or higher than a predetermined pressure, and the driver photographing unit determines that the expiratory pressure determining means causes the expiratory pressure to be equal to or higher than a predetermined pressure. The driver who is in the process of injecting the exhalation by taking an image of the driver after the determination is made and before the measurement is performed by the exhalation alcohol measurement unit The driver photographing unit captures the driver even when the movement detecting unit detects that the vehicle is moving.

  With this configuration, the in-vehicle breath alcohol measuring device of the present invention takes a picture of a driver who is inhaling breath to measure alcohol concentration, leaves an evidence image, and moves the vehicle. Take a picture of the driver and leave a proof image. That is, the in-vehicle breath alcohol measuring device of the present invention leaves evidence that the driver who actually drove the vehicle also received the alcohol concentration measurement. Therefore, the in-vehicle breath alcohol measuring device of the present invention can improve the illegal deterrence by the driver's replacement ball than before.

  The in-vehicle breath alcohol measuring device according to the present invention includes the driver's face photographed by the driver photographing unit while the driver is blowing the breath, and the vehicle by the movement detecting unit. It is preferable to include an identical face determination unit that determines whether or not the driver's face photographed by the driver photographing unit is the same person's face when it is detected that the vehicle is moving.

  With this configuration, the in-vehicle breath alcohol measuring device of the present invention determines whether or not the driver who actually driven the vehicle has also received the alcohol concentration measurement based on the determination result by the same face determination unit. Therefore, it is possible to determine whether the driver who is inhaling the breath to measure the alcohol concentration is taken, and the evidence image is taken of the driver who is moving the vehicle. The burden on the supervisor can be reduced as compared with the case where the supervisor is made to judge based on the above.

  According to the present invention, in-vehicle exhalation that can improve the illegal deterrence of the driver by replacing the driver by leaving evidence that the driver who actually drove the vehicle also received the alcohol concentration measurement. An alcohol measuring device can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  First, the configuration of an alcohol interlock system as an in-vehicle breath alcohol measuring device according to the present embodiment will be described.

  FIG. 1 is a perspective view of an alcohol interlock system 10 according to the present embodiment. FIG. 2 is a block diagram showing a configuration of the alcohol interlock system 10.

  The alcohol interlock system 10 is a system that does not allow the driver to drive the vehicle 100 when the driver is in a drinking state. As shown in FIGS. 1 and 2, the alcohol interlock system 10 includes a handy unit 20 that is detachably attached to a left portion of the handle 102 in the front surface of the dashboard 101 of the vehicle 100, and an upper surface of the dashboard 101. Among the display unit 40 installed on the right side of the handle 102 for performing various displays, the camera unit 60 installed on the upper part of the rearview mirror 103 of the vehicle 100 for photographing the driver, and the dashboard 101 A control unit 80 which is installed inside and controls the handy unit 20, the display unit 40 and the camera unit 60, a cable 11 which electrically connects the handy unit 20 and the control unit 80, and the display unit 40 and the control unit 80. Electric A cable 12 for connecting and the camera unit 60 and control unit 80 and a cable 13 for electrically connecting.

  The control unit 80 includes an interlock relay 81 including a switch 81a and an electromagnet 81b for switching the connection state of the switch 81a. The switch 81a includes a terminal 81c and a terminal 81d.

  As shown in FIG. 2, the vehicle 100 includes a battery 111, a cell motor 112 that is driven by the battery 111 to start the engine, a starter relay 113 that switches an electrical connection state between the battery 111 and the cell motor 112, and a key Is provided with a starter key switch 114 that switches an electrical connection state between the battery 111 and the starter relay 113 and a vehicle speed pulse generator 115 that generates a vehicle speed pulse signal representing the speed of the vehicle 100. The battery 111 includes a minus terminal 111a electrically connected to the ground and a plus terminal 111b. The cell motor 112 includes a terminal 112a that is electrically connected to the ground and the negative terminal 111a of the battery 111, and a terminal 112b. The starter relay 113 includes a switch 113a and an electromagnet 113b for switching the connection state of the switch 113a. The switch 113 a of the starter relay 113 includes a terminal 113 c electrically connected to the terminal 112 b of the cell motor 112 and a terminal 113 d electrically connected to the plus terminal 111 b of the battery 111. The electromagnet 113b of the starter relay 113 is electrically connected to the ground, the terminal 113e electrically connected to the negative terminal 111a of the battery 111 and the terminal 112a of the cell motor 112, and the terminal 81c of the switch 81a of the interlock relay 81. Terminal 113f. The starter key switch 114 turns on the terminal 114a electrically connected to the positive terminal 111b of the battery 111 and the terminal 113d of the starter relay 113, the OFF terminal 114b for turning off the engine of the vehicle 100, and the accessory power supply of the vehicle 100. An ACC terminal 114c for setting the state, an ON terminal 114d for turning on the ignition power source, and a START terminal 114e for starting the cell motor 112 are provided. The START terminal 114 e is electrically connected to the terminal 81 d of the interlock relay 81 of the control unit 80.

  The power of the battery 111 is supplied to the control unit 80, and is also supplied from the control unit 80 to the handy unit 20, the display unit 40, and the camera unit 60 through the cables 11, 12, and 13. In the following description, description of power supply is omitted.

  FIG. 3 is a front view of the handy unit 20. FIG. 4 is a block diagram showing the configuration of the handy unit 20.

  The handy unit 20 is a device for the driver to measure the alcohol concentration in exhaled breath before driving. As shown in FIGS. 3 and 4, the handy unit 20 includes a case 21, a replaceable mouthpiece 23 provided on the top of the case 21, and a switch 25 provided on the front of the case 21 and pushed by the driver. And a 7 seg display alcohol concentration display unit 26 provided on the front surface of the case 21 for displaying the alcohol concentration, and a subject lamp 27 provided on the upper part of the case 21 for emitting light when photographing with the camera unit 60. The cable 11 is connected to the lower part of the case 21.

  As shown in FIG. 4, the handy unit 20 includes an external interface 29 electrically connected to the control unit 80 via the cable 11 (see FIG. 3), and an expiration temperature sensor 31 for measuring the temperature of expiration. And an expiratory pressure sensor 32 for measuring the expiratory pressure, an expiratory CO 2 sensor 33 for measuring the concentration of carbon dioxide in the expiratory air, and an expiratory alcohol measuring unit for measuring the alcohol concentration in the expiratory air. An alcohol fuel cell sensor 34, an amplifier 35 for amplifying a signal output from the alcohol fuel cell sensor 34, a suction pump 36 for taking in exhalation into the alcohol fuel cell sensor 34, and a non-volatile memory for recording various data 37 and a CPU (Central Processes) for controlling each component of the handy unit 20 And a ing Unit) 38 inside the case 21.

  FIG. 5 is a perspective view of the display unit 40 shown in FIG. FIG. 6 is a block diagram showing a configuration of the display unit 40.

  The display unit 40 is a device that displays the alcohol concentration in the driver's breath and indicates the operation procedure by voice and display. As shown in FIGS. 5 and 6, the display unit 40 is provided at the left end of the front surface of the case 41 and the case 41, and the alcohol fuel cell sensor 34 (see FIG. 4) of the handy unit 20 (see FIG. 1). A warm-up lamp 43 for indicating that the vehicle is warming up, a blow lamp 44 provided right next to the warm-up lamp 43 on the front of the case 41 for prompting the driver to breathe in, and a case 41 A wait lamp 45 is provided on the right side of the blow lamp 44 on the front side of the battery to indicate that alcohol concentration is being measured by the alcohol fuel cell sensor 34, and is provided on the right side of the wait lamp 45 on the front side of the case 41. And the OK lamp 46 indicating that the driver has not been determined to be in a drinking state, and the OK lamp on the front of the case 41 7 seg provided on the right side of the display 46 to display that the driver has been determined to be drinking, and 7 seg provided on the right side of the NG lamp 47 in front of the case 41 to display the alcohol concentration. The alcohol concentration display unit 48 for display, the fingerprint reading unit 50 provided on the upper surface of the case 41 for reading the fingerprint of the right hand of the driver, and the speaker provided on the upper surface of the case 41 right next to the fingerprint reading unit 50 52, and the cable 12 is connected to the back surface of the case 41.

  As shown in FIG. 6, the display unit 40 has an external interface 54 electrically connected to the control unit 80 via the cable 12 (see FIG. 5) and images of thousands of fingerprints (hereinafter “ A fingerprint authentication module 55 that can be registered together with the registered fingerprint image and authenticates the fingerprint read by the fingerprint reading unit 50, and the sound output by the speaker 52 is generated. A sound scale LSI (Large Scale Integration) 57 and a CPU 58 for controlling each component of the display unit 40 are provided inside the case 41 (see FIG. 5).

  FIG. 7 is a front view of the camera unit 60 shown in FIG. FIG. 8 is a block diagram showing the configuration of the camera unit 60.

  As shown in FIGS. 7 and 8, the camera unit 60 is provided at the front end of the case 61 so that the case 61, the lens 63 provided at the center of the front of the case 61, and photographing at night can be taken. An imaging lamp 64 is provided, and the cable 13 is connected to the case 61.

  As shown in FIG. 8, the camera unit 60 is operated via an external interface 66 electrically connected to the control unit 80 via the cable 13 (see FIG. 7) and a lens 63 (see FIG. 7). CCD (Charge Coupled Device) image sensor 67 for photographing a person, a built-in antenna 68 for receiving a GPS (Global Positioning System) radio wave for specifying a location, and a GPS for decoding the GPS radio wave received by the built-in antenna 68 A case 61 includes a receiving module 69, a memory 70 for temporarily recording image data until the image data captured by the CCD image sensor 67 is transferred to the control unit 80, and a CPU 71 for controlling each component of the camera unit 60. (Figure And provided inside of the reference.).

  FIG. 9 is a perspective view of the control unit 80 shown in FIG. FIG. 10 is a block diagram showing the configuration of the control unit 80.

  As shown in FIGS. 9 and 10, the control unit 80 includes a case 82 and an antenna 83 standing on the upper surface of the case 82, and cables 11 to 14 are connected to the rear surface of the case 82.

  As shown in FIG. 10, the control unit 80 includes an interlock relay 81, an external interface 85, an amplifier 86 electrically connected to the electromagnet 81 b of the interlock relay 81, and an antenna 83. A communication module 87 for performing wireless communication with the outside, a clock LSI 88 for measuring time, a lithium battery 89 that is a power source of the clock LSI 88, and an acceleration for measuring the acceleration of the vehicle 100 (see FIG. 1). The case 82 (see FIG. 9) includes an acceleration sensor 90, a LOG memory 94 that records various data such as history information of the determination result of the drinking level, and a CPU 95 that controls each component of the control unit 80. ing. The terminal 81c of the interlock relay 81 is electrically connected to the terminal 113f of the starter relay 113 (see FIG. 2) via the cable 14 (see FIG. 9). The terminal 81 d of the interlock relay 81 is electrically connected to the START terminal 114 e of the starter key switch 114 (see FIG. 2) via the cable 14. The external interface 85 is electrically connected to the handy unit 20, the display unit 40, and the camera unit 60 via cables 11, 12, and 13 (see FIG. 9), respectively, and the battery 111 ( 2 are electrically connected to the negative terminal 111a and the positive terminal 111b, the ACC terminal 114c of the starter key switch 114, and the vehicle speed pulse generator 115.

  FIG. 11 is a graph showing the output voltage of the expiratory pressure sensor 32 and the output voltage of the alcohol fuel cell sensor 34 when the reference gas is blown into the handy unit 20 shown in FIG.

  The handy unit 20 has an ID (hereinafter referred to as “handy ID”) recorded in the nonvolatile memory 37. The handy ID is recorded in the nonvolatile memory 37 when the handy unit 20 is calibrated. Calibration of the handy unit 20 is performed in order to remove the influence of individual differences among components such as the expiration pressure sensor 32, the alcohol fuel cell sensor 34, and the suction pump 36. The calibration of the handy unit 20 will be specifically described with reference to FIG. In FIG. 11, the output voltage 191 of the expiratory pressure sensor 32 when a reference gas containing ethanol at a reference concentration as alcohol is blown from the mouthpiece 23 (see FIG. 3) by a fixed volume at a reference wind pressure. And the output voltage 192 of the alcohol fuel cell sensor 34 is shown. The output voltages 191 and 192 are such that the suction pump 36 is driven from the time 193 when the reference gas is blown from the mouthpiece 23 by a fixed volume at the reference wind pressure, and the reference gas is sucked into the alcohol fuel cell sensor 34. Is the output voltage. The voltage value 191a of the output voltage 191 is a voltage value output from the expiratory pressure sensor 32 corresponding to the reference wind pressure. The maximum voltage value 192a of the output voltage 192 and the area 192b indicated by hatching in the figure are used when the concentration of ethanol is calculated. The handy unit 20 is calibrated based on the difference between the actually measured voltage value 191a, voltage value 192a, and area 192b, and the respective values assumed. Here, the voltage value 191a and the voltage value 192a are generally about three or four digits, and are completely different between the individual handy units 20. The area 192b is generally a value of about 8 digits, and is completely different between the individual handy units 20. Therefore, the handy ID has sufficient discriminating power by being constituted by the voltage value 191a, the voltage value 192a, and the area 192b.

  Next, the operation of the alcohol interlock system 10 will be described.

  FIG. 12 is a flowchart of the operation of the alcohol interlock system 10. FIG. 13 is a flowchart subsequent to the operation shown in FIG. 12 among the operations of the alcohol interlock system 10. FIG. 14 is a flowchart subsequent to the operation shown in FIG. 13 among the operations of the alcohol interlock system 10.

  When the driver sits in the driver's seat of the vehicle 100 and presses the switch 25 of the handy unit 20, the CPU 95 of the control unit 80 detects that the switch 25 has been pressed and starts the operation shown in FIG.

  First, the CPU 95 reads the handy ID recorded in the nonvolatile memory 37 of the handy unit 20 (step S200), and the read handy ID is the same as the latest handy ID recorded in the LOG memory 94. Whether or not (step S202).

  If the CPU 95 determines in step S202 that the handy ID recorded in the non-volatile memory 37 and the handy ID recorded in the LOG memory 94 are not the same, the CPU 95 changes the handy unit 20 and determines in step S200. After the read handy ID, the current time obtained from the clock LSI 88, and the current position based on the GPS information obtained from the built-in antenna 68 and the GPS receiving module 69 of the camera unit 60 are recorded in the LOG memory 94 and the nonvolatile memory 37 (Step S204) The fact that the handy unit 20 has been changed is output by voice from the speaker 52 of the display unit 40 (Step S206).

  If the CPU 95 determines in step S202 that the handy ID recorded in the non-volatile memory 37 is the same as the handy ID recorded in the LOG memory 94, or if the process of step S206 is completed, Based on the output from the ACC terminal 114c of the key switch 114, it is determined whether or not the accessory power supply of the vehicle 100 is in an on state, that is, whether or not the ACC terminal 114c is electrically connected to the terminal 114a (step S208). ). When the CPU 95 determines in step S208 that the accessory power source is in the on state, the CPU 95 outputs the sound from the speaker 52 so as to retry the operation with the accessory power source in the off state (step S210), and the current time obtained from the clock LSI 88; After recording the current position based on the GPS information from the camera unit 60 and the fact that the accessory power supply is on in the LOG memory 94 and the nonvolatile memory 37 of the handy unit 20, a series of processing is terminated. The reason for ending the series of processes when the accessory power supply is on is that the warm-up time to be described later is prolonged when the temperature around the handy unit 20 is low, and the alcohol interlock system 10 is configured during that time. This is to prevent the battery 111 of the vehicle 100 from being consumed by an electronic device (for example, a car radio) other than the device to be operated. Therefore, when the capacity of the battery 111 is large or when the warm-up time is short, it is not necessary to end the series of processes even if the accessory power supply is in the on state.

  When CPU 95 determines that the accessory power supply is off in step S208, CPU 95 determines whether or not the speed of vehicle 100 is greater than 0 based on the output from vehicle speed pulse generator 115 of vehicle 100 (step S212). If the CPU 95 determines that the speed of the vehicle 100 is greater than 0 in step S212, the CPU 95 outputs the sound from the speaker 52 so as to restart the operation after stopping the vehicle 100 (step S214), and the current time obtained from the clock LSI 88 The current position based on the GPS information from the camera unit 60 and the fact that the speed of the vehicle 100 is greater than 0 are recorded in the LOG memory 94 and the non-volatile memory 37 of the handy unit 20, and then the series of processes is terminated.

  When CPU 95 determines that the speed of vehicle 100 is 0 in step S212, CPU 95 determines whether or not the acceleration of vehicle 100 is greater than 0 based on the output from acceleration sensor 90 (step S216). If the CPU 95 determines that the acceleration of the vehicle 100 is greater than 0 in step S216, the CPU 95 outputs the sound from the speaker 52 so as to repeat the operation after stopping the vehicle 100 (step S214), and the current time obtained from the clock LSI 88 The current position based on the GPS information from the camera unit 60 and the fact that the acceleration of the vehicle 100 is greater than 0 are recorded in the LOG memory 94 and the non-volatile memory 37 of the handy unit 20, and then a series of processing ends.

  Note that whether or not the vehicle 100 is moving can also be determined based on information other than the speed and acceleration of the vehicle 100. For example, when the vehicle 100 is moving, it is determined that the vehicle 100 is moving when the voltage of the battery 111 is equal to or higher than a predetermined voltage using the fact that the voltage is increased by generating and charging the battery 111. You can also. It can also be determined whether or not the vehicle 100 is moving based on a change in the current position based on GPS information from the camera unit 60.

  If the CPU 95 determines in step S216 that the acceleration of the vehicle 100 is zero, the CPU 95 causes the fingerprint authentication module 55 of the display unit 40 to perform fingerprint authentication. The fingerprint authentication module 55 performs authentication based on the fingerprint image registered in advance in itself and the driver's fingerprint image read from the fingerprint reading unit 50 of the display unit 40, and the authentication is successful. The registrant ID corresponding to the driver's fingerprint image read from the fingerprint reading unit 50 is transmitted to the CPU 95, and if the authentication fails, the registrant ID indicating the authentication failure, eg, No. 9999 is transmitted to the CPU 95. When the registrant ID is transmitted from the fingerprint authentication module 55, the CPU 95 determines whether the authentication is successful based on the registrant ID transmitted from the fingerprint authentication module 55 (step S218). Note that the CPU 95 stores the registrant ID transmitted from the fingerprint authentication module 55, the current time obtained from the clock LSI 88, and the current position based on the GPS information from the camera unit 60 in the nonvolatile memory of the LOG memory 94 and the handy unit 20. Record in the memory 37.

  If the CPU 95 determines that the authentication has failed in step S218, the CPU 95 outputs a voice indicating that the authentication has failed from the speaker 52 (step S220), and ends the series of processes.

  If the CPU 95 determines that the authentication is successful in step S218, the CPU 95 starts warming up the alcohol fuel cell sensor 34, turns on the WarmUP lamp 43 of the display unit 40, and the sound from the speaker 52, as shown in FIG. Is notified that the alcohol fuel cell sensor 34 is warming up (step S228). Here, the warm-up of the alcohol fuel cell sensor 34 means that the alcohol fuel cell sensor 34 is heated by the heater circuit inside the alcohol fuel cell sensor 34 even if the ambient temperature is as low as −45 ° C., for example. The operation is to maintain uniform measurement performance by raising the temperature inside the alcohol fuel cell sensor 34 to a constant 33 ° C. Then, the CPU 95 waits until the warm-up is completed (step S230).

  When the CPU 95 determines that the warm-up has been completed in step S230, the CPU 95 starts measuring time based on the output value of the clock LSI 88, and turns on the Blow lamp 44 of the display unit 40 and outputs sound from the speaker 52. Thus, the driver prompts the driver to breathe (step S232), and the photographing lamp 64 of the camera unit 60 is turned on (step S234).

  Next, the CPU 95 determines whether or not a predetermined time has elapsed during the measurement (step S236). If the CPU 95 determines that the predetermined time has elapsed in step S236, the CPU 95 outputs a voice indicating that the predetermined time has elapsed from the speaker 52 (step S238). In step S218, the CPU 95 prints the fingerprint. LOG indicating that the registrant ID transmitted from the authentication module 55, the current time obtained from the clock LSI 88, the current position based on the GPS information from the camera unit 60, and that a predetermined time has elapsed. After recording in the memory 94 and the non-volatile memory 37 of the handy unit 20, the photographing lamp 64 is turned off (step S240), and a series of processing ends.

If the CPU 95 determines in step S236 that the time being measured has not passed the predetermined time, the pressure of the exhaled air blown from the mouthpiece 23 of the handy unit 20 by the driver is a predetermined pressure, for example, 0.3 L / It is determined based on the measured value of the expiratory pressure sensor 32 whether or not it is longer than a second (expiratory pressure determining means) (step S246). The reason why the exhalation pressure is determined is that the alcohol concentration cannot be measured accurately unless exhalation at a certain pressure is performed. If the CPU 95 determines in step S246 that the expiratory pressure is not equal to or higher than the predetermined pressure, the CPU 95 returns to the process of S236.

  If the CPU 95 determines in step S246 that the expiratory pressure is equal to or higher than a predetermined pressure, the CPU 95 determines whether or not the concentration of carbon dioxide in the expiratory air blown from the mouthpiece 23 by the driver is equal to or higher than the predetermined concentration. A determination is made based on the measured value of the sensor 33 (step S248). The reason why the concentration of carbon dioxide in the exhalation is determined is to prevent fraud in which it is determined that the alcoholic state is not determined by blowing air that does not contain alcohol into the mouthpiece 23 by inflating. Human breath contains more carbon dioxide than air. If the CPU 95 determines in step S248 that the concentration of carbon dioxide in the expired air is not equal to or higher than the predetermined concentration, the registrant ID transmitted from the fingerprint authentication module 55 in step S218, the current time obtained from the clock LSI 88, the camera The current position based on the GPS information from the unit 60 and the fact that the concentration of carbon dioxide in the exhalation is not higher than a predetermined concentration are recorded in the LOG memory 94 and the nonvolatile memory 37 of the handy unit 20, and then the process of S236 is performed. Return.

  If the CPU 95 determines in step S248 that the concentration of carbon dioxide in the exhalation is equal to or higher than the predetermined concentration, the temperature of the exhaled air blown from the mouthpiece 23 by the driver is within a predetermined temperature range centered on 34 ° C. Is determined based on the measured value of the expiration temperature sensor 31 (step S250).

  FIG. 15 is a graph showing changes in the measured value of the expiration temperature sensor 31 for each type of air blown from the mouthpiece 23 of the handy unit 20.

  The reason for determining the expiration temperature in step S250 is to prevent fraud in which air that does not contain alcohol is blown into the mouthpiece 23 by inflating or the like so as not to be determined as a drinking state. As shown in FIG. 15, the air blown by inflating the air converges on the temperature of the air around the handy unit 20, whereas the human exhalation is stable depending on the human body temperature. Regardless of the temperature of the air around the handy unit 20, it always converges to around 34 ° C.

  As shown in FIG. 13, if the CPU 95 determines in step S250 that the expiration temperature is not within a predetermined temperature range centered on 34 ° C., the registrant ID transmitted from the fingerprint authentication module 55 in step S218 The LOG memory 94 and the handy that the current time obtained from the clock LSI 88, the current position based on the GPS information from the camera unit 60, and that the temperature of the breath is not within a predetermined temperature range centered on 34 ° C. After recording in the nonvolatile memory 37 of the unit 20, the process returns to S236.

  If the CPU 95 determines in step S250 that the expiration temperature is within a predetermined temperature range centered on 34 ° C., the volume of air blown from the mouthpiece 23 by the driver is a predetermined volume, for example, 1.0 L. Whether or not this is the case is determined based on the time measured by the clock LSI 88 and the measured value of the expiratory pressure sensor 32 (step S252). The reason for determining the volume of the blown air is that if the alcohol concentration is measured when there is little accumulation of the blown air, the alcohol concentration of fresh air that has just entered the mouth may be measured. This is because a certain volume of air needs to be blown in order to measure the exhaled air, ie the alcohol concentration of the air that has entered the lungs. If the CPU 95 determines in step S252 that the volume of the blown air is not greater than or equal to the predetermined volume, the CPU 95 returns to the process of S236.

  FIG. 16 is a graph showing an example of the passage of time of pressure, carbon dioxide concentration, temperature, and volume of air blown into the mouthpiece 23 of the handy unit 20.

  In FIG. 16, the CPU 95 proceeds from step S246 to step S248 because the expiratory pressure 301 blown from the mouthpiece 23 by the driver becomes equal to or higher than the predetermined pressure 301a at time 311. Next, the CPU 95 proceeds from step S248 to step S250 because the carbon dioxide concentration 302 in the expired air that is blown from the mouthpiece 23 by the driver becomes equal to or higher than the predetermined concentration 302a at time 312. Next, the CPU 95 proceeds from step S250 to step S252 because the expiratory temperature 303 blown from the mouthpiece 23 by the driver falls within a predetermined temperature range 303a centered on 34 ° C. at time 313. Then, the CPU 95 proceeds from step S252 to the next step because the volume 304 of air blown from the mouthpiece 23 by the driver (the area indicated by hatching in FIG. 16) exceeds a predetermined volume at time 314. .

  As shown in FIG. 13, when the CPU 95 determines in step S252 that the volume of the blown air is greater than or equal to a predetermined volume, the subject lamp 27 of the handy unit 20 is turned on (step S254), and the camera unit 60 is caused to turn on. By transferring the shutter command, the CCD image sensor 67 is caused to photograph the driver (step S256). Therefore, an image 401 (see FIG. 17) of the driver who is blowing exhalation from the mouthpiece 23 of the handy unit 20 in which the subject lamp 27 is lit is recorded in the memory 70 of the camera unit 60. That is, the CCD image sensor 67 is configured to capture a driver who is in the middle of exhalation and constitutes a driver imaging unit of the present invention.

  Next, the CPU 95 starts the measurement of the alcohol concentration by the alcohol fuel cell sensor 34 by driving the suction pump 36 of the handy unit 20 to introduce exhalation into the alcohol fuel cell sensor 34 (step S258). The fact that the alcohol fuel cell sensor 34 is measuring the alcohol concentration is notified by the lighting of the wait lamp 45 of the unit 40 and the sound output from the speaker 52 (step S260).

  When the measurement started in step S258 is completed, the CPU 95 is based on the registrant ID transmitted from the fingerprint authentication module 55 in step S218, the current time obtained from the clock LSI 88, and the GPS information from the camera unit 60. The current position, the measurement result, and the image 401 photographed in step S256 and recorded in the memory 70 of the camera unit 60 are recorded in the LOG memory 94 and the nonvolatile memory 37 of the handy unit 20 (step S262) and measured. It is determined whether the alcohol concentration is equal to or less than a predetermined reference value (step S264).

  If the CPU 95 determines that the alcohol concentration exceeds the predetermined reference value in step S264, the CPU 95 determines that the alcohol is in a drunk state and cannot start the engine, from the lighting of the NG lamp 47 of the display unit 40 and the speaker 52. (Step S266), the photographing lamp 64 is turned off (step S268), and the series of processing ends.

  When the CPU 95 determines that the alcohol concentration is equal to or lower than the predetermined reference value in step S264, the CPU 95 supplies power to the electromagnet 81b of the interlock relay 81 via the amplifier 86 and closes the switch 81a (step S270). The fact that the engine can be started because it has not been determined is notified by the lighting of the OK lamp 46 of the display unit 40 and the sound output from the speaker 52 (step S272). Note that the CPU 95 opens the switch 81a after 5 minutes have passed since the switch 81a was closed in step S270. Accordingly, the driver can start the engine of the vehicle 100 by turning the key of the starter key switch 114 within 5 minutes to electrically connect the terminal 114a and the START terminal 114e. That is, when the terminal 114 a of the starter key switch 114 and the START terminal 114 e are electrically connected, the starter relay 113 of the starter key 113 is connected via the switch 81 a of the interlock relay 81 of the control unit 80 and the starter key switch 114. The electric power of the battery 111 is supplied to the electromagnet 113b and the switch 113a is closed, whereby the electric power of the battery 111 is supplied to the cell motor 112 via the switch 113a of the starter relay 113, and the engine of the vehicle 100 is started.

  After notifying in step S272, CPU 95 determines whether or not the speed of vehicle 100 is greater than 0 based on the output from vehicle speed pulse generator 115 of vehicle 100 (step S274), as shown in FIG. ). When CPU 95 determines that the speed of vehicle 100 is 0 in step S274, CPU 95 determines whether the acceleration of vehicle 100 is greater than 0 based on the output from acceleration sensor 90 (step S276). When CPU 95 determines in step S276 that the acceleration of vehicle 100 is zero, it returns to the process of step S274. Note that whether or not the vehicle 100 is moving can also be determined based on information other than the speed and acceleration of the vehicle 100 as described above. Thus, the CPU 95 detects that the vehicle 100 is moving, and constitutes a movement detection unit of the present invention.

  If the CPU 95 determines that the speed of the vehicle 100 is greater than 0 in step S274, or if the acceleration of the vehicle 100 is determined to be greater than 0 in step S276, the CPU 95 transfers the shutter image to the camera unit 60 to transfer the CCD image. The driver is photographed by the sensor 67 (step S278). Therefore, an image 402 (see FIG. 18) of the driver who is driving the vehicle 100 is recorded in the memory 70 of the camera unit 60.

  Next, the CPU 95 captures the registrant ID transmitted from the fingerprint authentication module 55 in step S218, the current time obtained from the clock LSI 88, the current position based on the GPS information from the camera unit 60, and the image taken in step S278. The image 402 recorded in the memory 70 of the camera unit 60 is recorded in the LOG memory 94 and the nonvolatile memory 37 of the handy unit 20 (step S280), and the photographing lamp 64 is turned off (step S282).

  Next, the CPU 95 detects the face image in the image 401 (see FIG. 17) recorded in the LOG memory 94 in step S262 and the face in the image 402 (see FIG. 18) recorded in the LOG memory 94 in step S280. Based on the image, face authentication is performed to determine whether the person who has received the determination of the drinking level and the actual driver of the vehicle 100 are the same person, and whether or not the face authentication is successful. Judgment is made (step S284). As described above, the CPU 95 detects that the vehicle 100 is moving by the driver's face photographed by the CCD image sensor 67 while the driver is blowing exhalation and the movement detection unit. It is determined whether the driver's face photographed by the CCD image sensor 67 is the same person's face or not, and constitutes the same face determination unit of the present invention.

  If the CPU 95 determines in step S284 that the person who has received the determination of the drinking level and the actual driver of the vehicle 100 are not the same person, that is, that face authentication has failed, the fingerprint authentication module 55 starts from step S218. The transmitted registrant ID, the current time obtained from the clock LSI 88, the current position based on the GPS information from the camera unit 60, and the face authentication failure are recorded in the LOG memory 94 and the nonvolatile memory 37 of the handy unit 20. (Step S286), and a series of processing is terminated.

  If the CPU 95 determines in step S284 that the person who has received the determination of the drinking level and the actual driver of the vehicle 100 are the same person, that is, that the face authentication has been successful, the fingerprint authentication module 55 starts in step S218. The transmitted registrant ID, the current time obtained from the clock LSI 88, the current position based on GPS information from the camera unit 60, and the success of face authentication are recorded in the LOG memory 94 and the nonvolatile memory 37 of the handy unit 20. (Step S288), and a series of processing is terminated.

  The various information recorded in the LOG memory 94 can be used for various purposes later. For example, the determination result of the drinking level recorded in the LOG memory 94 is regularly used for monitoring at the police station in charge in the case of drunk driving addicts, or periodically in the case of business use. Can be used for monitoring.

  Various information recorded in the LOG memory 94 may be transmitted to the outside by the antenna 83 and the communication module 87 of the control unit 80. For example, the determination result of drinking status is sent to the mail server of the police station in charge in real time for drunk driving addicts, or sent to the mail server of the administration headquarters in real time for business use. be able to. Of course, various information recorded in the LOG memory 94 may be read from the outside via the antenna 83 and the communication module 87 of the control unit 80.

  Moreover, although the alcohol interlock system 10 inputs a registrant ID by fingerprint authentication, it may be input by other methods. For example, the registrant ID may be input by a magnetic card or an IC (Integrated Circuit) card.

  As described above, the alcohol interlock system 10 takes a picture of a driver who is inhaling exhalation to measure alcohol concentration, leaves an evidence image, and moves the vehicle 100. Take a picture of the driver and leave a proof image. In other words, the alcohol interlock system 10 leaves evidence that the driver who actually driven the vehicle 100 has also measured the alcohol concentration. Therefore, the alcohol interlock system 10 can improve the illegal deterrence by the driver's replacement ball than before.

  Further, the alcohol interlock system 10 can cause the driver's supervisor to determine whether or not the driver who actually driven the vehicle 100 has also measured the alcohol concentration based on the determination result by the CPU 95. The supervisor makes a judgment based on the evidence image taken by the driver who is inhaling the breath to measure the alcohol concentration and the evidence image taken by the driver who is moving the vehicle 100 The burden on the supervisor can be reduced compared with the case of making it happen.

  In the present embodiment, the alcohol interlock system 10 has been described as the in-vehicle breath alcohol measuring device of the present invention. However, the in-vehicle breath alcohol measuring device of the present invention is an in-vehicle breath alcohol other than the alcohol interlock system. It can also be applied to a measuring device.

1 is a perspective view of an alcohol interlock system according to an embodiment of the present invention. It is a block diagram which shows the structure of the alcohol interlock system shown in FIG. It is a front view of the handy unit shown in FIG. It is a block diagram which shows the structure of the handy unit shown in FIG. It is a perspective view of the display unit shown in FIG. It is a block diagram which shows the structure of the display unit shown in FIG. It is a front view of the camera unit shown in FIG. It is a block diagram which shows the structure of the camera unit shown in FIG. It is a perspective view of the control unit shown in FIG. It is a block diagram which shows the structure of the control unit shown in FIG. FIG. 5 is a graph showing an output voltage of an expiratory pressure sensor and an output voltage of an alcohol fuel cell sensor when a reference gas is blown into the handy unit shown in FIG. 4 at a constant volume at a reference wind pressure. It is a flowchart of operation | movement of the alcohol interlock system shown in FIG. It is a flowchart following the operation | movement shown in FIG. 12 among operation | movement of the alcohol interlock system shown in FIG. It is a flowchart following the operation | movement shown in FIG. 13 among operation | movement of the alcohol interlock system shown in FIG. It is a graph which shows the change of the measured value of an expiration temperature sensor according to the kind of air blown from the mouthpiece of the handy unit shown in FIG. It is a graph which shows the example of the time passage of the pressure of the air blown in the mouthpiece 23 of the handy unit shown in FIG. 3, carbon dioxide gas concentration, temperature, and volume. It is a figure which shows the image of the driver | operator in the middle of breathing in from the mouthpiece of the handy unit in which the to-be-photographed lamp shown in FIG. 3 is lit. It is a figure which shows the image of the driver in the middle of driving the vehicle shown in FIG.

Explanation of symbols

10 Alcohol interlock system (on-board breath alcohol measuring device)
34 Alcohol fuel cell sensor (exhaled alcohol measurement unit)
67 CCD image sensor (driver's photography part)
95 CPU (movement detection unit, same face determination unit)
100 vehicles

Claims (2)

A breath alcohol measurement unit that measures alcohol concentration in the breath of a driver of a vehicle, and a driver photographing unit that photographs the driver while the driver is blowing the breath An in-vehicle breath alcohol measuring device mounted on the vehicle,
An expiratory pressure sensor for measuring the expiratory pressure, expiratory pressure determining means for determining whether the expiratory pressure is equal to or higher than a predetermined pressure based on a measured value of the expiratory pressure sensor, and the vehicle A movement detection unit that detects that the vehicle is moving,
The expiration alcohol measurement unit performs the measurement when the expiration pressure determination unit determines that the expiration pressure is equal to or higher than a predetermined pressure,
The driver photographing unit photographs the driver after the expiration pressure determining unit determines that the expiration pressure is equal to or higher than a predetermined pressure until the measurement is performed by the expiration alcohol measurement unit. By taking a picture of the driver while the driver is blowing the exhalation,
The in-vehicle breath alcohol measuring device, wherein the driver photographing unit photographs the driver even when the movement detecting unit detects that the vehicle is moving. When the driver detects that the vehicle is moving by the driver's face taken by the driver photographing unit and the movement detecting unit while the breath is being blown The in-vehicle breath alcohol according to claim 1, further comprising an identical face determination unit that determines whether or not the driver's face photographed by the driver photographing unit is the same person's face. measuring device.

Images