JP2009052952A - Alcohol detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alcohol detector capable of relaxing the troublesomeness caused by timewise restriction upon detection of an alcohol. <P>SOLUTION: The exhalation blown in from an exhalation blowing port 4 is once confined in an exhalation chamber 8, and the air introduced from an inhalation port 6 is confined in an air chamber 9. Then, the alcohol contained in the air confined in the air chamber 9 is detected by an alcohol sensor 31. Thereafter, the exhalation in the exhalation chamber 8 and the air in the air chamber 9 are mutually mixed in the closed region including the exhalation chamber 8 and the air chamber 9 while being considered so as not to flow out of the closed region to become a mixture gas. Then, the alcohol contained in the mixture gas thus confined in the closed region is detected by the alcohol sensor 31. Subsequently, the detection results twice in all of the alcohol by the alcohol sensor 31 are analyzed to specify whether an alcohol examinee remains drunken. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an alcohol detector that detects alcohol in expired air.

  In recent years, a system has been proposed as a system for preventing drunk driving that prohibits driving of a vehicle when an alcohol detector detects alcohol exceeding a predetermined value that suggests that the alcohol subject is in a drunk state. (For example, refer to Patent Document 1).

  In such a system, when alcohol detection is performed by an alcohol detector, the alcohol sensor is first heated using the operation of the alcohol detection switch as a trigger. When this is completed, alcohol is detected by the alcohol sensor in the air atmosphere before the breath is blown from the breath blowing port, and the sensor output is acquired as a reference value. Then, when this is completed, a message prompting alcohol detection is notified, and when the alcohol subject inhales exhalation from the exhalation breathing port according to the message, the alcohol in the exhalation is detected by the alcohol sensor, and the sensor output is a measured value. Get as.

And the alcohol value in the air is specified by analyzing the reference value, and the alcohol value in the expiration is specified by analyzing the measured value, and the alcohol in the air is determined from the alcohol value in the expiration. When the difference when the value is reduced exceeds the threshold value, it is determined that the alcohol subject is in a drunk state, and driving of the vehicle is prohibited.
JP 63-53120 A

  However, when alcohol detection is performed by a conventional alcohol detector, there is a waiting time until a message prompting alcohol detection is notified after the alcohol subject operates the alcohol detection switch. In addition, alcohol subjects may need to start exhalation within a period until a predetermined time elapses after the notification of such a message, or it is necessary to continue the exhalation operation for a predetermined time or more. Are subject to various time constraints.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide an alcohol detector capable of reducing troublesomeness caused by time constraints in alcohol detection. There is to do.

  In order to achieve the above object, the invention described in claim 1 is an alcohol detector that detects alcohol contained in exhaled air blown from an exhaled breathing port with an alcohol sensor, and exhaled air blown from the exhaled breathing port. An exhaled air chamber, an exhaled air flow preventing shutter that traps the exhaled air flowing into the exhaled chamber, an air chamber into which air introduced from an intake port flows, and the air that has flowed into the air chamber An air outflow prevention shutter that traps the air in the air chamber, and allows the exhaled air confined in the exhalation chamber to flow into the air chamber, and the exhaled air that flows into the air chamber and the air confined in the air chamber And an air-fuel mixture outflow prevention shutter that confines the air-fuel mixture in a closed region including the exhalation chamber and the air chamber. And it detects the alcohol by the alcohol sensor contained in the air, and its gist detecting the alcohol contained in the mixed gas confined in the closed region by the alcohol sensor.

  According to this configuration, exhaled air that has been blown from the exhalation air inlet is once confined in the exhalation chamber, while air introduced from the intake port is confined in the air chamber. And the alcohol contained in the air confined in the air chamber is detected by the alcohol sensor. Thereafter, exhaled air in the expiratory chamber and air in the air chamber are mixed with each other in the closed region to become an air-fuel mixture while taking care not to flow out of the closed region including the expiratory chamber and the air chamber. The alcohol contained in the air-fuel mixture confined in the closed region is detected by the alcohol sensor. And it becomes possible to identify whether the alcohol subject is in a drinking state by analyzing the result of alcohol detection twice by the alcohol sensor.

  In this way, once the exhalation is trapped in the exhalation chamber, the alcohol subject no longer needs to breathe. Therefore, it is possible to reduce the troublesomeness caused by the time restriction when detecting alcohol.

  The gist of the invention described in claim 2 is that the alcohol detector according to claim 1 is provided with a gas mixture circulating means for circulating the gas mixture confined in the closed region in the closed region. It is said.

According to this configuration, since the air-fuel mixture is circulated in the closed region, the alcohol concentration in the closed region becomes uniform. Therefore, the detection accuracy of alcohol detection by the alcohol sensor can be improved.
The gist of the invention described in claim 3 is that, in the alcohol detector according to claim 1 or 2, only one alcohol sensor is provided in the air chamber.

  According to this configuration, the first alcohol sensor is provided in the expiration chamber and the second alcohol sensor is provided in the air chamber, so that the number of parts is reduced as compared with an alcohol detector having a total of two alcohol sensors. , Can contribute to reducing the size and weight of alcohol detectors.

  According to a fourth aspect of the present invention, there is provided the alcohol detector according to the second or third aspect, wherein the air-fuel mixture is opened in a state where both the exhalation outflow prevention shutter and the air outflow prevention shutter are open. The gist of the invention is that the air-fuel mixture is discharged to the outside of the alcohol detector by operating the circulating means to prepare for the next alcohol detection.

  According to this configuration, when alcohol detection by the alcohol detector is completed, the air-fuel mixture is discharged to the outside of the alcohol detector in preparation for the next alcohol detection. For this reason, when the next alcohol detection is performed, the air-fuel mixture used in the previous alcohol detection is prevented from being affected. This is also useful in the sense of keeping the alcohol detector hygienic.

Since this invention is comprised as mentioned above, there exist the following effects.
According to the present invention, it is possible to reduce the annoyance caused by time constraints when detecting alcohol.

Hereinafter, an embodiment embodying the present invention will be described.
The alcohol detector 1 shown in FIG. 1 is provided in a system for preventing drunk driving. The drunk driving preventing system includes an electronic key possessed by a vehicle user and a security device provided on the vehicle side. The present invention is applied to a vehicle to which a so-called electronic key system in which two-way communication related to key authentication is performed is applied.

  In a vehicle to which these two systems are applied, through the key authentication, the security device makes an affirmative determination that a proper electronic key suitable for the vehicle has been used, and alcohol detection by the alcohol detector 1 is performed. As a result, driving of the vehicle is allowed on the condition that it is determined that the alcohol subject is not in a drinking state.

  The alcohol detector 1 is installed in the vehicle, and a nozzle 3 protrudes from the end surface of the detector main body 2. The tip of the nozzle 3 is provided with an exhalation-injecting port 4 for an alcoholic subject to inject exhalation into his detector body 2 from his / her mouth, and the exhalation-injecting port 4 is used as a starting end inside the nozzle 3. The exhalation flow path 5 is provided. In addition, an air inlet 6 for introducing air from the outside to the inside of the detector main body 2 is provided on the side surface of the detector main body 2, and the inside of the detector main body 2 starts from the air intake 6. An air flow path 7 is provided.

  The nozzle 3 is directly attached by an alcohol test subject, and therefore has a cylindrical shape having an appropriate outer diameter in consideration of the gripping comfort. Here, since the nozzle 3 is directly attached by the alcohol test subject, the nozzle 3 can be attached to and detached from the detector body 2 so that it can be changed from the one for others to the one for exclusive use. You may consider the aspect. Incidentally, the alcohol detector 1 is not limited to the one installed in the vehicle, and may be carried together with the electronic key by the vehicle user himself / herself or a driving person who has received permission from the person.

  As shown in FIG. 2, an inside of the detector main body 2 is provided with an expiration chamber 8 so as to communicate with the expiration channel 5, and an air chamber 9 so as to communicate with the air channel 7. Is provided.

  A first shutter 11 is provided on the upstream side of the expiration chamber 8, and a second shutter 12 is provided on the downstream side of the expiration chamber 8. On the other hand, a third shutter 13 is provided on the upstream side of the air chamber 9, and a fourth shutter 14 is provided on the downstream side of the air chamber 9. In addition, a fifth shutter 15 and a sixth shutter 16 are provided between the expiration chamber 8 and the air chamber 9.

  The exhalation chamber 8 is provided with a first propeller 21, and the air chamber 9 is provided with a second propeller 22. The air chamber 9 is provided with an alcohol sensor 31 for detecting alcohol.

  As shown in FIG. 3, the first shutter 11 is electrically connected to the microcomputer 40 via a driver 11a, and the second shutter 12 (the third shutter 13 to the sixth shutter). 16) is electrically connected to the microcomputer 40 via the driver 12a (drivers 13a to 16a). The first propeller 21 is electrically connected to the microcomputer 40 via a motor driver 21a and an A / D converter 21b, and the second propeller 22 is connected to the microcomputer 40 via a motor driver 22a. Is electrically connected. Furthermore, the alcohol sensor 31 is electrically connected to the microcomputer 40 via a sensor driver 31a and a heater driver 31b.

  Next, an operation when alcohol in the exhalation is detected by the alcohol detector 1 will be described. In the initial state, the first shutter 11 to the fourth shutter 14 are in the open state, the fifth shutter 15 to the sixth shutter 16 are in the closed state, and the first propeller 21 to the first propeller are in the closed state. It is assumed that the second propeller 22 is in a rotation stop state and the microcomputer 40 is in a sleep state.

  Now, when the alcohol subject inhales exhalation from the exhalation inlet 4 in such an initial state, as shown in FIG. 4, exhalation flows into the expiration chamber 8 from the exhalation flow path 5, and the first propeller 21 is caused by the wind pressure of the exhalation. Rotates forward. Then, after passing through the expiration chamber 8, the expiration is discharged to the outside of the detector body 2 from an exhaust port (not shown) provided at the tip of the second shutter 12.

  Then, when the first propeller 21 rotates, the first propeller 21 serves as a power generator, and at this time, a signal (power generation indicating that power generation by the first propeller 21 is performed). Status signal) is input from the A / D converter 21b to the microcomputer 40, whereby the microcomputer 40 wakes up.

  Then, the microcomputer 40 rotates the second propeller 22 forward via the motor driver 22 a, and thereby air is introduced from the intake port 6, and the air flows into the air chamber 9 from the air flow path 7. Then, after passing through the air chamber 9, the air is discharged to the outside of the detector body 2 from an exhaust port (not shown) provided at the tip of the fourth shutter 14.

Therefore, in the state shown in FIG. 4, the expiration chamber 8 is filled with expiration and the air chamber 9 is filled with air.
Then, when the power generation state signal is continuously input from the A / D converter 21b for a predetermined time, the microcomputer 40 determines that the breathing by the alcohol subject has been appropriately performed. When such a determination is made, the microcomputer 40 closes the first shutter 11 to the fourth shutter 14 via the drivers 11a to 14a as shown in FIG. Rotation of the first propeller 21 to the second propeller 22 is stopped via ˜22a. At this time, the microcomputer 40 notifies the alcohol subject through a notification means (not shown) that the breath may be stopped.

Therefore, when in the state shown in FIG. 5, exhaled air is confined in the expiratory chamber 8 and air is confined in the air chamber 9.
In this embodiment, the first shutter 11, the second shutter 12, the fifth shutter 15, and the sixth shutter 16 are used to confine the exhaled air flowing into the exhalation chamber 8 into the exhalation chamber 8. A prevention shutter is configured. On the other hand, the third shutter 13, the fourth shutter 14, the fifth shutter 15, and the sixth shutter 16 constitute an air outflow prevention shutter that traps the air flowing into the air chamber 9 in the air chamber 9. Has been.

  Thereafter, the microcomputer 40 starts heating the alcohol sensor 31 via the heater driver 31b. When the heating is completed and alcohol detection by the alcohol sensor 31 can be properly performed, the microcomputer 40 inputs the sensor. Enable the signal. Then, the microcomputer 40 analyzes the signal to specify the alcohol concentration in the air confined in the air chamber 9, and stores it as the reference alcohol concentration.

  Thereafter, as shown in FIG. 6, the microcomputer 40 opens the fifth shutter 15 to the sixth shutter 16 via the drivers 15 a to 16 a and opens the first propeller 21 via the motor driver 21 a. The second propeller 22 is rotated in the reverse direction through the motor driver 22a. Then, exhaled air that has been confined in the expiratory chamber 8 flows into the air chamber 9 and air that has been confined in the air chamber 9 flows into the expiratory chamber 8 until then. A mixture of exhaled air and air is circulated in a closed region including the chamber 9.

  The first shutter 11 to the sixth shutter 16 allow the exhaled air confined in the exhalation chamber 8 to flow into the air chamber 9, and the exhaled air and the air chamber 9 that have flowed into the air chamber 9. An air-fuel mixture outflow prevention shutter is provided to confine the air-fuel mixture confined in the air in a closed region including the exhalation chamber 8 and the air chamber 9. On the other hand, the first propeller 21 and the second propeller 22 constitute an air-fuel mixture circulating means for circulating the air-fuel mixture confined in the closed region including the expiratory chamber 8 and the air chamber 9 in the closed region. Yes.

  And the microcomputer 40 validates the signal input from the sensor driver 31a in the stage which performed the circulation of such air-fuel mixture over predetermined time. The microcomputer 40 analyzes the signal to specify the alcohol concentration in the air-fuel mixture confined in the closed region, and stores it as the measured alcohol concentration.

  Then, the microcomputer 40 determines that the alcohol subject is not in a drunk state when the difference when the reference alcohol concentration is subtracted from the measured alcohol concentration does not exceed the threshold value. When such a determination is made, one of the conditions necessary for allowing the vehicle to operate is satisfied. That is, in the present embodiment, it is determined that the alcohol subject is not in a drinking state, and that a security device (not shown) has affirmed that a regular electronic key suitable for the vehicle has been used, Driving of the vehicle is allowed.

  On the other hand, when the difference when the reference alcohol concentration is subtracted from the measured alcohol concentration exceeds the threshold value, the microcomputer 40 determines that the alcohol subject is in a drinking state. And when such a determination is made, even if a regular electronic key is used, driving of the vehicle is prohibited and drunk driving is thereby prevented.

  In summary, according to the alcohol detector 1 of the present embodiment, the exhaled air that has been infused from the exhalation inhaling port 4 is once confined in the exhalation chamber 8, while the air introduced from the inhaling port 6 is the air chamber. 9 The alcohol contained in the air confined in the air chamber 9 is detected by the alcohol sensor 31. Thereafter, while taking into consideration that the exhaled air in the exhalation chamber 8 and the air in the air chamber 9 do not flow out of the closed region including the exhaled chamber 8 and the air chamber 9, they are mixed with each other in the closed region. It becomes. The alcohol contained in the air-fuel mixture confined in the closed region is detected by the alcohol sensor 31. Then, by analyzing the result of alcohol detection twice by the alcohol sensor 31, it is specified whether or not the alcohol subject is in a drinking state.

  When the alcohol detection by the alcohol detector 1 is completed, the microcomputer 40 opens the first shutter 11 to the fourth shutter 14 and prepares the fifth shutter 15 to the fifth shutter in preparation for the next alcohol detection. 6 is closed, and the rotation of the first propeller 21 to the second propeller 22 is stopped, and then the operation returns to the sleep state.

  That is, in the present embodiment, when alcohol detection by the alcohol detector 1 is completed, the microcomputer 40 opens the first shutter 11 to the fourth shutter 14 in preparation for the next alcohol detection, and the fifth The shutter 15 to the sixth shutter 16 are closed (however, the first propeller 21 to the second propeller 22 are rotating). Then, for a while after that, the first propeller 21 is rotated forward in the manner shown in FIG. 6 and the second propeller 22 is maintained while being rotated backward, and a predetermined time has passed. Thus, the rotation of the first propeller 21 to the second propeller 22 is stopped, and the sleep state is restored.

  When the first propeller 21 to the second propeller 22 are rotated as described above, air is introduced from the exhalation blow-in port 4 on the exhalation chamber 8 side and the fourth shutter 14 on the air chamber 9 side. Air is introduced from an exhaust port (not shown) provided at the end of the head. That is, in this case, an exhaust port (not shown) provided at the end of the exhalation air inlet 4 and the fourth shutter 14 functions as an intake port, and a new air flow is created inside the detector body 2.

  Then, the air-fuel mixture is divided into the expiratory chamber 8 side and the air chamber 9 side. The air-fuel mixture is discharged, and the air-fuel mixture is discharged from the intake port 6 to the outside of the detector body 2 on the air chamber 9 side. That is, in this case, an exhaust port (not shown) or an intake port 6 provided at the end of the second shutter 12 functions as an exhaust port, and the air-fuel mixture is discharged from the inside of the detector body 2.

  Then, this is performed for a while, that is, for a period of time sufficient for the air-fuel mixture to be completely discharged, so that the inside of the detector body 2 is dried and eventually the inside of the detector body 2 is clean ( Hygienic). That is, the exhaled breath directly blown into the detector body 2 generally contains a lot of moisture, and the air introduced into the detector body 2 also has a lot depending on the external environment. In some cases, moisture may be included, and when the inside of the detector body 2 is not dried, condensation may occur inside the detector body 2, but in the present embodiment, such condensation is prevented. Therefore, according to the configuration of the present embodiment, it is possible to expect effects such as suppression of the growth of germs caused by condensation.

  At the same time as the air-fuel mixture is discharged in this way, exhaled air or air that has not become the air-fuel mixture, for example, exhaled air remaining slightly in the exhalation flow path 5, is also outside the detector body 2. Since it is discharged, the above effects are promoted. The reason is that the first propeller 21 to the second propeller 22 are rotated, so that new air spreads throughout the interior of the detector main body 2, thereby allowing not only the air-fuel mixture but also the interior of the detector main body 2. This is because the exhaled air and the old air are surely discharged to the outside of the detector body 2.

  Incidentally, the rotation direction of the first propeller 21 to the second propeller 22 when the air-fuel mixture is discharged in this way is not limited to the above configuration. That is, the first propeller 21 to the second propeller 22 are all rotated in the forward direction, the first propeller 21 to the second propeller 22 are both rotated in the reverse direction, and the first propeller 21 is rotated in the reverse direction. Any of the configurations in which the second propeller 22 is normally rotated may be employed.

  However, as in the configuration of the present embodiment, the mode shown in FIG. 6 (the first propeller 21 is forward rotation and the second propeller 22 is reverse rotation), which is the mode immediately before completion of alcohol detection by the alcohol detector 1, is continued. In the case of adopting such a configuration, it is simple because it is not necessary to change the rotation direction of the first propeller 21 to the second propeller 22 when discharging the air-fuel mixture.

As described above, according to the present embodiment, the following operations and effects can be obtained.
(1) Once the exhalation is trapped in the exhalation chamber 8, the alcohol subject no longer needs to breathe. Therefore, it is possible to reduce the troublesomeness caused by the time restriction when detecting alcohol.

  (2) Since the air-fuel mixture is circulated in the closed region including the exhalation chamber 8 and the air chamber 9, the alcohol concentration in the closed region becomes uniform. Therefore, the detection accuracy of alcohol detection by the alcohol sensor 31 can be improved.

  (3) Only one alcohol sensor 31 is provided in the air chamber 9. For this reason, since the first alcohol sensor is provided in the expiration chamber 8 and the second alcohol sensor is provided in the air chamber 9, the number of parts is reduced as compared with an alcohol detector having a total of two alcohol sensors. The alcohol detector 1 can be reduced in size and weight.

(4) It is only necessary to inhale exhalation at any time without waiting until the heating of the alcohol sensor 31 is completed. Therefore, it is possible to eliminate the waiting time until exhalation is blown.
(5) When exhalation is blown from the exhalation blowing port 4, the first propeller 21 is rotated by the wind pressure, the first propeller 21 serves as a generator, and a power generation state signal is input to the microcomputer 40. As a result, the microcomputer 40 wakes up. For this reason, in the period until the microcomputer 40 is woken up, that is, in the period when the microcomputer 40 is in the sleep state, the power consumed by the microcomputer 40 can be suppressed.

  (6) In relation to the above (4) to (5), alcohol detection by the alcohol detector 1 is started with the expiration of the exhalation from the exhalation inlet 4 as a trigger. For this reason, it becomes possible to omit the switch operated in order to start alcohol detection. Therefore, since the number of parts is reduced, it is possible to contribute to the reduction in size and weight of the alcohol detector 1.

  (7) When alcohol detection by the alcohol detector 1 is completed, the air-fuel mixture is discharged to the outside of the alcohol detector 1 in preparation for the next alcohol detection. For this reason, when the next alcohol detection is performed, the air-fuel mixture used in the previous alcohol detection is prevented from being affected. This is also useful in terms of keeping the alcohol detector 1 hygienic.

In addition, the said embodiment can also be changed and actualized as follows.
The timing for starting the heating of the alcohol sensor 31 may be immediately after the microcomputer 40 wakes up. If comprised in this way, while exhalation (air) is confine | sealed in the expiration chamber 8 (air chamber 9), the alcohol sensor 31 can be heated in parallel with them. Therefore, it is possible to shorten the time until the heating of the alcohol sensor 31 is completed, and as a result, it is possible to shorten the time until the alcohol detection by the alcohol detector 1 is completed.

  The volume of the expiration chamber 8 and the volume of the air chamber 9 may be the same as each other or different from each other. In any case, since their volumes are known in advance, they may be used at the design stage to set a threshold value for specifying whether or not the alcohol subject is in a drinking state.

  The alcohol sensor is not limited to one that requires heating, such as a semiconductor gas sensor or a hot wire gas sensor, and may be one that does not require heater heating, such as an electrochemical gas sensor.

Next, a technical idea that can be grasped from the above embodiment and another example will be described.
[1] In an alcohol detector for detecting alcohol contained in exhaled breath blown from an exhalation breathing port with an alcohol sensor,
An exhalation chamber into which exhaled air blown from the exhalation air inlet flows,
An exhalation outflow prevention shutter that traps exhaled air flowing into the exhalation chamber in a closed region including the exhalation chamber,
An alcohol detector, wherein alcohol contained in exhaled breath confined in the closed region is detected by the alcohol sensor.

  According to this configuration, exhaled air that has been blown from the exhalation blowing port is once confined in a closed region including the exhalation chamber. The alcohol contained in the exhaled breath confined in the closed region is detected by the alcohol sensor. Then, by analyzing the result of alcohol detection by the alcohol sensor, it is possible to specify whether or not the alcohol subject is in a drinking state.

  In this way, once the exhalation has been trapped within the closed region including the exhalation chamber, the alcohol subject no longer needs to breathe. Therefore, it is possible to reduce the troublesomeness caused by the time restriction when detecting alcohol.

In the embodiment, the first shutter 11 to the sixth shutter 16 correspond to the exhalation outflow prevention shutter.
[2] In an alcohol detector that detects alcohol contained in exhaled breath blown from an exhalation breathing port with an alcohol sensor,
An exhalation chamber into which exhaled air blown from the exhalation air inlet flows,
An air chamber into which air introduced from the intake port flows,
A mixture outflow prevention shutter for confining a mixture of exhaled air flowing into the exhalation chamber and air flowing into the air chamber in a closed region including the exhalation chamber and the air chamber;
An alcohol detector, wherein the alcohol sensor detects alcohol contained in an air-fuel mixture confined in the closed region.

  According to this configuration, exhaled air that has been blown from the exhalation air inlet and air introduced from the inhalation air port are mixed with each other in the closed region while taking care not to flow out of the closed region including the exhalation chamber and the air chamber. Together, it becomes a mixture. And the alcohol contained in the air-fuel mixture confined in the closed region is detected by the alcohol sensor. Then, by analyzing the result of alcohol detection by the alcohol sensor, it is possible to specify whether or not the alcohol subject is in a drinking state.

  In this way, once the exhalation has been trapped within the closed region including the exhalation chamber and the air chamber, the alcohol subject no longer needs to inhale exhalation. Therefore, it is possible to reduce the troublesomeness caused by the time restriction when detecting alcohol.

The perspective view which shows the external appearance of an alcohol detector. Explanatory drawing which shows the internal structure of an alcohol detector. The block diagram which shows the electric constitution of an alcohol detector. Explanatory drawing which shows a mode that the exhalation chamber is filled with exhalation, and the air chamber is filled with air. Explanatory drawing which shows a mode that while exhalation is confined in an expiration chamber and air is confine | sealed in an air chamber. Explanatory drawing which shows a mode that the air-fuel | gaseous mixture of expiration | expired_air and air is circulated within the closed area | region containing an expiration | expired_air chamber and an air chamber.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Alcohol detector, 4 ... Exhalation inlet, 6 ... Intake port, 8 ... Exhalation chamber, 9 ... Air chamber, 11 ... 1st shutter (Shutter for prevention of exhalation outflow, shutter for mixture outflow prevention), 12 ... Second shutter (expiration outflow prevention shutter, mixture outflow prevention shutter), 13 ... Third shutter (air outflow prevention shutter, mixture outflow prevention shutter), 14 ... Fourth shutter (air outflow prevention) Shutter, mixture air outflow prevention shutter, 15 ... fifth shutter (expiration outflow prevention shutter, air outflow prevention shutter, mixture outflow prevention shutter), 16 ... sixth shutter (expiration outflow prevention shutter) , Air outflow prevention shutter, air mixture outflow prevention shutter), 21... First propeller (air mixture circulation means), 22... Second propeller (air mixture circulation means), 31. Capacitors.

Claims (4)

In an alcohol detector that detects alcohol contained in exhaled breath blown from an exhalation breathing port with an alcohol sensor,
An exhalation chamber into which exhaled air blown from the exhalation air inlet flows,
An exhalation outflow prevention shutter that traps exhaled air flowing into the exhalation chamber;
An air chamber into which air introduced from the intake port flows,
An air outflow prevention shutter that traps the air flowing into the air chamber in the air chamber;
Allowing the exhaled air confined in the exhalation chamber to flow into the air chamber, and the mixture of the exhaled air flowing into the air chamber and the air confined in the air chamber to the exhalation chamber and the air chamber And an air-fuel mixture outflow prevention shutter confined in a closed region containing
The alcohol detector detects alcohol contained in the air confined in the air chamber by the alcohol sensor, and detects alcohol contained in the air-fuel mixture confined in the closed region by the alcohol sensor. . The alcohol detector according to claim 1,
An alcohol detector comprising an air-fuel mixture circulating means for circulating the air-fuel mixture confined in the closed region in the closed region. The alcohol detector according to claim 1 or 2,
The alcohol detector is characterized in that only one alcohol sensor is provided in the air chamber. In the alcohol detector according to claim 2 or claim 3,
By operating the air-fuel mixture circulating means in a state where both the exhalation outflow prevention shutter and the air outflow prevention shutter are open, the air-fuel mixture is discharged to the outside of the alcohol detector. An alcohol detector characterized by being prepared for alcohol detection.

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