JP2011073503A - Drunk driving preventive system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drunk driving preventive system detecting falsification committed to other systems. <P>SOLUTION: The drunk driving preventive system includes an alcohol concentration measuring means which is mounted on a vehicle to detect the alcohol content in the breath of a driver of the vehicle and to measure its concentration, and a vehicle control means which limits the operation of the vehicle or invalidates the engine of the vehicle based on the result of measurement by the alcohol concentration measuring means, and further includes a start factor determining means for determining whether or not the start of the drunk driving preventive system is caused by the power-on reset by supplying the power to the drunk driving preventive system, a power-on rest number storage means for integrating and storing the power-on reset number when it is determined that the start of the drunk driving preventive system is caused by the power-on reset, and a power-on rest number output means for outputting the stored power-on reset number to an external apparatus. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a drunk driving prevention device mounted on a vehicle.

  Drunk driving of vehicles (for example, automobiles) has become a serious social problem, and it is strictly prohibited for a driver to drive a vehicle in a drunk state. Nevertheless, in conventional vehicles, whether or not a drunk driver drives depends on the driver's awareness. For this reason, a technique for forcibly preventing a drunken driver from driving a vehicle is disclosed (see Patent Document 1). In these techniques, if an alcohol concentration measuring device is mounted on a vehicle and it is not confirmed that the driver is not drunk, for example, the engine circuit cannot be operated.

  In addition, a detection device (that is, a drunk driving prevention device) has been devised that can reliably prevent impersonation when a person different from the driver measures the alcohol concentration (see Patent Document 2).

JP 2009-012733 A JP 2009-160988 A

  In conventional drunk driving prevention devices such as Patent Documents 1 and 2, when the driver is drunk, the drunk driving prevention device is removed, and instead, the engine is allowed to start or the vehicle is driven It is possible to detect an act (falsification of the device) such as when a device that always outputs a signal (dummy signal) that does not suppress the signal is attached, and when the driver finishes driving, the drunk driving prevention device is reattached There is a problem that you can not.

  Against the background of the above problems, an object of the present invention is to provide a drunk driving prevention device capable of detecting tampering with other devices.

Means for Solving the Problems and Effects of the Invention

  A drunk driving prevention apparatus for solving the above problems is mounted on a vehicle, detects alcohol content in the breath of the driver of the vehicle, and includes alcohol concentration measuring means for measuring the concentration, and alcohol concentration measuring means. A drunk driving prevention device comprising a vehicle control means for restricting the operation of the vehicle or being unable to start the engine of the vehicle based on the measurement result, wherein the drunk driving prevention device is activated when the drunk driving prevention device is activated. The activation factor determination means for determining whether or not the power-on reset is caused by turning on the power, and when it is determined that the drunk driving prevention device is activated by the power-on reset, the number of power-on resets is accumulated. Power-on-reset-count storage means for storing the power-on-reset, and power-on-reset-count output means for outputting the stored power-on reset number to an external device, Characterized in that it comprises.

  The present invention focuses on the fact that when the drunk driving prevention device is removed and reattached, the power is turned on again (that is, power-on reset), and it is determined whether or not the drunk driving prevention device has been removed. is there. With the above configuration, it can be seen that the drunk driving prevention device has been removed, so that it can be presumed that the drunk driving prevention device has been tampered with and other devices can be alerted.

  Moreover, the drunk driving prevention apparatus of this invention is provided with the display means which displays the output frequency | count of power-on reset.

  With the above configuration, for example, a vehicle manager such as a vehicle owner can grasp the number of power-on resets, that is, the number of times that the drunk driving prevention device is removed.

  Further, the drunk driving prevention apparatus of the present invention includes a first reset signal generating means for generating a first reset signal when the drunk driving prevention device is turned on, and a first reset signal when the power to the drunk driving prevention device is turned on. A second reset signal generating means for generating a second reset signal with a delay, and a second reset signal detecting means for detecting the generation of the second reset signal, wherein the activation factor determining means generates the second reset signal. When detected, it is determined that the drunk driving prevention device is activated by a power-on reset.

  With the above configuration, it is possible to determine whether or not the drunk driving prevention device is activated by a power-on reset.

  In the drunk driving prevention device of the present invention, the CPU that controls the operation of the drunk driving prevention device has a built-in watchdog timer function or a reset circuit having a built-in watchdog timer function connected thereto. The system is configured to apply a system reset to the CPU by function, and further includes a system reset information storage unit that stores system reset information indicating that the system reset is performed when the system reset is performed. When the driving prevention device is activated, the reset information storage unit is referred to. When the system reset information is not stored, it is determined that the drunk driving prevention device is activated by a power-on reset.

  Also with the above configuration, it is possible to determine whether or not the drunk driving prevention device is activated by a power-on reset.

The top view of the driver's seat equipped with the drunk driving prevention device. The side view of the driver's seat equipped with the drunk driving prevention device. The system block diagram of a drunk driving prevention apparatus. The flowchart explaining a power-on reset frequency update process. The flowchart explaining a power-on reset determination process. The flowchart explaining another example of a power-on reset determination process. FIG. 7 is a flowchart for explaining processing in the configuration of FIG. 6. The flowchart explaining a power-on reset frequency display process. The figure which shows the example of a warning display.

  Hereinafter, the drunk driving prevention apparatus of the present invention will be described with reference to the drawings. As shown in FIG. 1 and FIG. 2, the drunk driving prevention device 100 is provided in the driver's seat 2 portion of the vehicle 1. The alcohol detector 4 detects the alcohol content in the breath of the driver 3 and measures the concentration thereof, and the seating sensor that is attached to the driver seat 2 of the vehicle 1 and detects whether the driver 3 is seated. 8, a door sensor 12 for detecting the opening / closing of the door 11 on the driver's seat 2 side, a window sensor 14 for detecting the opening / closing of the window 13 on the driver's seat 2 side, and for example, a ceiling mounted almost directly above the driver's seat 2. A speaker 15 for issuing a warning or guidance to the person 3 and a display 16 attached to the console panel 5 (also called an instrument panel) in front of the driver's seat 2 for displaying the measurement result of the alcohol concentration. I have. In FIG. 1, 9 is a passenger seat, and 17 is a handle (steering wheel).

  The alcohol detector 4 detects the alcohol content in exhaled breath by the driver 3 as a person to be measured, and measures its concentration. In a normal case (exhalation non-measurement state), the alcohol detector 4 is disposed at a predetermined position of the console panel 5 in front of the driver's seat 2. The driver 3 extends his hand while holding the driver's seat 2 to grip the alcohol detector 4, removes it from the console panel 5, and draws it to his / her mouth. Then, the alcohol detector 4 is blown into the breath to inspect its own alcohol state. If the alcohol detector 4 is in a normal state (non-drinking state), the alcohol detector 4 is returned to a predetermined position on the console panel 5 and the engine of the vehicle 1 is Start.

  Next, the door sensor 12 and the window sensor 14 will be described. The door sensor 12 is a sensor for detecting whether or not the door 11 on the driver's seat 2 side in the vehicle 1 is closed, and the window sensor 14 is a window 13 on the door 11 on the driver's seat 2 side. It is a sensor for detecting whether or not there is. Both sensors 12 and 14 issue a warning to the driver when the door 11 or the window 13 is in an open state (described later).

  As shown in FIG. 3, the alcohol detector 4 and its measurement start switch 4 a, the seating sensor 8, the door sensor 12, the window sensor 14, the speaker 15, and the display 16 are connected to the controller 20 attached to the inside of the console panel 5, for example. It is connected. When signals are input to the controller 20 from the sensors 8, 12, 14 and the measurement start switch 4a of the alcohol detector 4, predetermined processing (measurement of alcohol concentration, etc.) is performed in the controller 20, and the result is the speaker 15. And output to the display 16. Further, the operation of the starter relay 30 is controlled based on the result.

  The display 16 is configured as a color LCD display, for example, and displays various types of information when the drunk driving prevention apparatus 100 is in operation. The display 16 corresponds to a power-on reset frequency output means and display means of the present invention.

  The controller 20 is attached to the inside of the console panel 5, for example, and is a known CPU 21, ROM 22, RAM 23, I / O 24 that is an input / output circuit, A / D converter 26, communication I / F (interface) 27, memory 28, And a bus line 25 for connecting these components.

  The CPU 21 performs control using the control program 22p and data stored in the ROM 22. The A / D conversion unit 26 includes a well-known A / D (analog / digital) conversion circuit, and converts analog data input to the controller 20 from, for example, the above-described various sensors into digital data that can be calculated by the CPU 21. is there. The communication I / F 27 is a communication interface circuit such as a CAN (Controller Area Network) or a LAN (Local Area Network) card for exchanging data with other in-vehicle devices. The CPU 21 corresponds to the vehicle control means, start factor determination means, and second reset signal detection means of the present invention. The communication I / F 27 corresponds to the power-on reset frequency output means of the present invention.

  The controller 20 is supplied with power from a power supply circuit 2 including a battery and a known voltage conversion circuit. The controller 20 further includes a reset circuit 41, a delay signal generation circuit 42, and a watchdog timer (hereinafter also referred to as WDT) 43. Details of these operations will be described later. The reset circuit 41 corresponds to the first reset signal generating means of the present invention. The delay signal generating circuit 42 corresponds to the second reset signal generating means of the present invention. The WDT 43 corresponds to a reset circuit incorporating the watchdog timer function of the present invention. The WDT 43 may be built in the CPU 21.

  As the memory 28, an electrically rewritable semiconductor storage medium such as a flash memory or a hard disk device is used, and the stored content is retained even when the drunk driving prevention device 100 is turned off. Information and data necessary for the operation of the drunk driving prevention system 1 such as concentration threshold information for making the determination are stored. The memory 28 is provided with a reset information storage unit 28a for storing system reset information. The memory 28 corresponds to the power-on reset number storage means and the system reset information storage means of the present invention.

  Hereinafter, an outline of the operation of the drunk driving prevention apparatus 100 having the above-described configuration will be described. When the driver 3 who gets into the vehicle 1 is seated in the driver's seat 2, the seating sensor 8 is turned on. The driver 3 extends his hand while sitting in the driver's seat 2, grasps the alcohol detector 4, and removes it from the console panel 5. Subsequently, the driver 3 operates the measurement start switch 4 a of the alcohol detector 4. As a result, the alcohol detector 4 becomes measurable. In this state, the driver 3 blows the breath toward the alcohol detector 4. Since the driver 3 holds the alcohol detector 4, the driver 3 can easily approach his / her mouth. For this reason, the driver 3 can spray the alcohol detector 4 while sitting in the driver's seat 2, and the operation of blowing the breath is easy. The alcohol detector 4 corresponds to the alcohol concentration measuring means of the present invention.

  When the alcohol detector 4 is in a measurable state, the open / close state of the door 11 by the door sensor 12 and the open / close state of the window 13 by the window sensor 14 are confirmed. If either of them is open, a third party outside the vehicle (not shown) can blow the alcohol detector 4 through the door 11 or the window 13, so that this state (the door 11 or the window 13 is not open). At least one of them is in the open state), and it is regarded as impersonation of the driver 3, and a warning message such as "Door or window is open. Close it and press the measurement start switch again" is issued from the speaker 15. If both the door 11 and the window 13 are closed, the speaker 15 issues a guidance message such as “Blow exhalation”.

  Thereafter, when the driver 3 blows the breath on the alcohol detector 4, the alcohol detector 4 measures the alcohol concentration in the breath. When the measurement of the alcohol concentration in the expiration is completed, the measurement result is displayed on the display 16 and the driver 3 is determined to drink alcohol (dried). If the measured alcohol concentration is equal to or higher than the concentration threshold value, it is considered that the driver 3 is in a drunken state, and a warning message such as “Alcohol detected. The starter relay 30 of the vehicle 1 is turned off. Thereby, even if the driver | operator 3 operates an ignition key, the engine of the vehicle 1 cannot be started.

  If the measured alcohol concentration is less than the concentration threshold value, it is estimated that the driver 3 is in a normal state (non-drinking state), and a guidance message such as “can be driven” is issued from the speaker 15, and the controller 20 turns on the starter relay 30 of the vehicle 1. Thereby, if the driver | operator 3 operates an ignition key, the engine of the vehicle 1 can be started. If the state in which the driver 3 is seated in the driver's seat 2 is maintained by detecting the state of the seating sensor 8, the vehicle 1 is allowed to travel.

  The power-on reset frequency update process in the drunk driving prevention apparatus 100 will be described with reference to FIG. This process is included in the control program 22p and is repeatedly executed together with other processes of the control program 22p. First, when the drunk driving prevention apparatus 100 is reset, various settings in the drunk driving prevention apparatus 100 are initialized (S11).

  Next, power-on reset determination (that is, activation factor determination) processing for determining whether or not the current reset is a power-on reset is executed (S12, described later).

  When it is determined that the current reset is a power-on reset (S13: Yes), the power-on reset number counter stored in the reset information storage unit 28a of the memory 28 is updated (accumulated) (S14).

  Thereafter, various processes as the drunk driving prevention apparatus 100 as described above are executed (S15).

  The power-on reset determination process corresponding to step S12 in FIG. 4 will be described with reference to FIG. Note that the configuration in this processing conforms to the configuration in paragraphs 0057 to 0072 and FIGS. 6 to 8 (third embodiment) of Japanese Patent Laid-Open No. 2003-044324, and includes a microprocessor 11, a reset circuit 13, and a delay. The signal generation circuit 42 and the watchdog timer 12 correspond to the CPU 21, the reset circuit 41, the delay signal generation circuit 42, and the watchdog timer 43 in the configuration of the present invention, respectively. In the configuration of the present invention (see FIG. 3), the watchdog timer 43 can write data into the memory 28 (reset information storage unit 28a) via the bus line 25.

  Similar to the configuration of Japanese Patent Laid-Open No. 2003-044324, at the time of power-on reset, the reset signal RST (first reset signal of the present invention) output from the reset circuit 41 to the CPU 21 is released (change from L to H). Since the delayed signal DEL (second reset signal of the present invention) is still at the low level L, it can be determined that the program is normally started by turning on the power.

  That is, in the power-on reset determination process, the delay signal DEL is captured (S31), the signal level is determined, and when the delay signal DEL is at the low level L (S32: Yes), it is determined that the power-on reset is performed. (S33).

  Another example of the power-on reset determination process corresponding to step S12 in FIG. 4 will be described with reference to FIGS. First, a WDT reset process performed by the WDT 43 when a system reset is performed on the CPU 21 by the WDT 43 will be described with reference to FIG.

  When the reset condition is satisfied because the timer overflows in the WDT 43 (S71: Yes, “WDT reset occurs” in FIG. 7), the WDT 43 stores the reset information storage unit 28a of the memory 28 via the bus line 25. System reset information is written (S72). The system reset information is flag information, for example, and 1 is set in the flag when a WDT reset occurs. Thereafter, the reset signal RST is output to the CPU 21 (S73).

  In the power-on reset determination process of FIG. 6, first, the system reset information stored in the reset information storage unit 28a of the memory 28 is read (S51). When there is no system reset information, that is, when 1 is not set in the flag (S52: No), it is determined that the power-on reset is performed (S53). Finally, the system reset information is erased, that is, the flag is set to 0 (S54), and this process ends.

The power-on reset number display process in the drunk driving prevention apparatus 100 will be described with reference to FIG. This process is included in the control program 22p and is repeatedly executed together with other processes of the control program 22p. First, it is determined whether or not the timing for displaying the number of power-on resets has arrived. As the display timing, at least one of the following is used.
When a power-on reset is detected in the power-on reset determination process of FIG. 4 (for example, executed after step S14).
When a predetermined operation (for example, long press for 1 second or more) is performed on the measurement start switch 4a by the passenger.
A terminal 32 (see FIG. 3) such as a personal computer or a portable information terminal is connected to the drunk driving prevention apparatus 100 via the communication I / F 27, and a power-on reset number display request or When a power-on reset frequency output request is sent to the drunk driving prevention device 100.

  When it is determined that the timing for displaying the power-on reset count has arrived (S91: Yes), the power-on reset count counter stored in the reset information storage unit 28a of the memory 28 is referred to (S92). Then, when the value of the power-on reset number counter is not 0 (S93: Yes), for example, a warning display as shown in FIG. 9 is performed (S94).

The warning display uses at least one of the following.
A warning is displayed on the display 16.
When the display unit (LCD, LED, etc.) is included in the alcohol detector 4, a warning is displayed on this display unit.
A warning is displayed on the display unit 32a of the terminal 32.
When the display unit is an LED, a warning is displayed with a predetermined blinking pattern. Further, a voice message corresponding to the warning display may be transmitted from the speaker 15.

  Even when the value of the power-on reset counter is 0 (S93: No), a display such as “no abnormality” may be performed on the display 16 or the like (S95).

  Further, after displaying the number of power-on resets, the value of the power-on reset number counter stored in the reset information storage unit 28a of the memory 28 may be cleared by a predetermined operation such as a passenger.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to them, and the knowledge of those skilled in the art can be used without departing from the scope of the claims. Various modifications based on this are possible.

1 vehicle 4 alcohol detector (alcohol concentration measuring means)
4a Measurement start switch 15 Speaker 16 Display (display means)
20 controller 21 CPU (vehicle control means, activation factor determination means, second reset signal detection means)
27 Communication I / F (Power-on reset frequency output means)
28 memory (power-on reset count storage means, system reset information storage means)
28a Reset information storage unit 32 Terminal 32a Display unit (display means)
41 Reset circuit (first reset signal generating means)
42 Delay signal generating circuit (second reset signal generating means)
43 Watchdog Timer (WDT)
100 Drunk driving prevention device

Claims (4)

Alcohol concentration measuring means mounted on the vehicle, detecting alcohol content in the breath of the driver of the vehicle, and measuring its concentration;
Vehicle control means for restricting the operation of the vehicle or making it impossible to start the engine of the vehicle based on the measurement result by the alcohol concentration measuring means;
A drunk driving prevention device comprising:
An activation factor determination means for determining whether the activation of the drunk driving prevention device is due to a power-on reset by turning on the power to the drunk driving prevention device;
When it is determined that the start of the drunk driving prevention device is due to a power-on reset, a power-on reset number storage means for accumulating and storing the power-on reset number;
A power-on reset frequency output means for outputting the stored power-on reset frequency to an external device;
A drunk driving prevention device comprising:   The drunk driving prevention apparatus according to claim 1, further comprising display means for displaying the output number of power-on resets. First reset signal generating means for generating a first reset signal when power is supplied to the drunk driving prevention device;
Second reset signal generating means for generating a second reset signal later than the first reset signal when power is supplied to the drunk driving prevention device;
Second reset signal detecting means for detecting the generation of the second reset signal;
With
3. The drunk driving according to claim 1, wherein the activation factor determining unit determines that the drunk driving prevention device is activated by a power-on reset when the generation of the second reset signal is detected. Prevention device. The CPU that controls the operation of the drunk driving prevention device has a built-in watchdog timer function or a reset circuit having a built-in watchdog timer function is connected, and a system reset is applied to the CPU by the watchdog timer function. With configuration,
System reset information storage means for storing system reset information for executing the system reset when the system reset is performed;
The activation factor determination means refers to the reset information storage means when the drunk driving prevention device is activated, and when the system reset information is not stored, the drunk driving prevention device is activated by a power-on reset. The drunk driving prevention apparatus according to any one of claims 1 to 3, wherein the drunk driving prevention device is determined.

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