WO2013005580A1 - Driving assistance device and driving assistance method - Google Patents

Driving assistance device and driving assistance method Download PDF

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Publication number
WO2013005580A1
WO2013005580A1 PCT/JP2012/065965 JP2012065965W WO2013005580A1 WO 2013005580 A1 WO2013005580 A1 WO 2013005580A1 JP 2012065965 W JP2012065965 W JP 2012065965W WO 2013005580 A1 WO2013005580 A1 WO 2013005580A1
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WO
WIPO (PCT)
Prior art keywords
driver
hand
temperature
awakening
blowing
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PCT/JP2012/065965
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French (fr)
Japanese (ja)
Inventor
智晴 中野
善治 紙透
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日産自動車株式会社
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Publication of WO2013005580A1 publication Critical patent/WO2013005580A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
    • B60H1/00821—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being ventilating, air admitting or air distributing devices
    • B60H1/00864—Ventilators and damper doors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
    • B60H1/00742—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models by detection of the vehicle occupants' presence; by detection of conditions relating to the body of occupants, e.g. using radiant heat detectors

Definitions

  • the present invention relates to a driving support device and a driving support method.
  • a driving support device For designated countries where incorporation by reference of documents is permitted, the contents described in the application documents of Japanese Patent Application No. 2011-14795 filed in Japan on July 4, 2011 are incorporated into this application by reference. , Part of the description of this application.
  • Patent Document 1 a technique for blowing cool air to a driver's hand when the driver's arousal level is reduced is known in order to prevent the driver from falling asleep during driving.
  • the driver may not be able to sufficiently obtain the awakening effect by blowing cool air against the driver's hand. In such a case, the driver's arousal state cannot be appropriately induced, and the driver may be uncomfortable.
  • the problem to be solved by the present invention is to provide a driving support device and a driving support method that can appropriately guide the driver's arousal state.
  • the present invention blows cold air to the driver's hand based on the change state of the driver's hand temperature when the cool air corresponding to the arousal level is being blown to the driver's hand. It is determined whether or not the awakening effect is obtained, and when it is determined that the awakening effect is not obtained, the above problem is solved by stopping the blowing of the cold air according to the awakening degree.
  • the present invention it is determined whether or not the awakening effect is obtained by blowing cool air to the driver's hand, and when the awakening effect is not obtained, the blowing of the cold air is stopped. , Driver discomfort can be suppressed.
  • FIG. 1 is a diagram showing a vehicle arrangement relationship of the navigation system 1000 according to the present embodiment.
  • FIG. 2 is a configuration diagram showing the configuration of the navigation system 1000 according to the first embodiment.
  • the navigation system 1000 includes a steering angle sensor 101, a vehicle speed sensor 102, an accelerator opening sensor 103, an acceleration sensor 104, a face image capturing camera 105, a hand temperature sensor 106, and a control device. 110, and an arousal state inducing device 120. These devices are connected by a CAN (Controller Area Network) or other vehicle-mounted LAN, and exchange information with each other.
  • CAN Controller Area Network
  • the steering angle sensor 101 is installed in the steering column and detects the steering angle (rotation angle) of the steering. Information on the steering angle of the steering detected by the steering angle sensor 101 is transmitted to the control device 110.
  • the vehicle speed sensor 102 detects the vehicle speed of the host vehicle.
  • the vehicle speed information of the host vehicle detected by the vehicle speed sensor 102 is transmitted to the control device 110.
  • the accelerator opening sensor 103 is installed on the accelerator pedal and detects the amount of depression (stroke amount) of the accelerator pedal by the driver. Information on the stroke amount detected by the accelerator opening sensor 103 is transmitted to the control device 110.
  • the acceleration sensor 104 detects lateral acceleration generated in the host vehicle. Information on acceleration detected by the acceleration sensor 104 is transmitted to the control device 110.
  • the face image capturing camera 105 is installed in an instrument panel in front of the driver, and images the face portion of the driver. Image data of the driver's face captured by the face image capturing camera 105 is transmitted to the control device 110.
  • the hand temperature sensor 106 detects the temperature of the driver's hand (hereinafter also referred to as hand temperature).
  • a hand temperature sensor 106 is a temperature sensor made of a thermocouple.
  • the hand temperature sensor 106 is provided at a position on the steering wheel that is likely to be gripped by the driver.
  • the hand temperature sensor 106 may be provided on the entire steering wheel.
  • the arousal state inducing device 120 drives a wind at a temperature corresponding to the driver's arousal level in order to induce the driver's arousal state to an appropriate state, as shown in FIG. 1. Air is blown against the person's hand.
  • the control device 110 is accessible to a ROM (Read Only Memory) that stores a program for appropriately guiding the driver's arousal state and a CPU (Central Processing Unit) that executes the program stored in the ROM. It is composed of a RAM (Random Access Memory) that functions as a storage device.
  • ROM Read Only Memory
  • CPU Central Processing Unit
  • control apparatus 110 performs the program stored in ROM by CPU, the awakening degree detection function which detects a driver
  • An awakening state induction function for blowing air, a temperature change detection function for detecting a change state of a driver's hand temperature, an awakening effect determination function for determining an awakening effect by blowing cool air to the driver's hand, and A control function for performing control when the awakening effect is not obtained is realized. Below, each function with which the control apparatus 110 is provided is demonstrated.
  • the wakefulness detection function of the control device 110 detects the driver's wakefulness. For example, the arousal level detection function performs the eye open / close determination of the driver based on the image data acquired from the face image capturing camera 105, and calculates the integrated value of the number of eyes closed during a predetermined time. Can be detected. The arousal level detection function can also detect the driver's arousal level by detecting changes in the facial expression of the driver based on the image data acquired from the face image capturing camera 105.
  • the arousal level detection function performs frequency analysis on the time-series data of the steering angle detected by the steering angle sensor 101, and based on the integrated value of the specific frequency among the frequency components of the time-series data of the steering angle.
  • the driver's arousal level can also be detected by judging the wobbling of the host vehicle and the smoothness of the steering operation by the driver.
  • the arousal level detection function performs frequency analysis on the time-series data of the lateral acceleration of the host vehicle detected by the acceleration sensor 104, and determines whether the host vehicle is wobbling or the smoothness of the steering operation by the driver.
  • the driver's arousal level can be detected.
  • the arousal level detection function can also detect the driver's arousal level based on the stroke amount information acquired from the accelerator opening sensor 103. Further, when detecting the driver's arousal level, the vehicle speed information acquired from the vehicle speed sensor 102 may be taken into account.
  • Arousal guiding function of the control device 110 awareness of the driver detected by the alertness detection function determines whether a predetermined first reference values S 1 or less.
  • the first reference values S 1 given, for example, low awareness of the driver, which is a reference value for determining whether the driver is likely to snooze.
  • Wakefulness guiding function when the wakefulness of the driver is determined to be the first reference values S 1 or less has a low awareness of the driver, determines that the driver is likely to doze, awake
  • the state induction device 120 is caused to blow cool air corresponding to the driver's arousal level to the driver's hand.
  • the wakefulness induction function mixes the wakefulness induction device 120 with the outside air taken from outside the vehicle and the air cooled by the evaporator provided in the wakefulness induction device 120 in the chamber provided in the wakefulness induction device 120. Then, the cold air of 10 ° C. which is the lowest temperature in the temperature range in which the cold sensation is stimulated by the skin temperature sensation is generated, and the generated cold air is passed through the outlet provided in the wakefulness induction device 120 from the driver Air is blown against the part. Thereby, a driver
  • the arousal state guidance function is such that the driver's arousal level detected by the arousal level detection function is a predetermined level when cold air is blown to the driver's hand by the awake state guidance device 120. determines whether the second reference value S 2 or more.
  • the predetermined second reference value S 2 a first reference value greater than S 1, is the reference value for arousal state of the driver to determine whether the proper state .
  • Wakefulness guiding function when the blast of cold air is made to the hand of the driver by wakefulness induction device 120, if the awareness of the driver is determined to be the second reference value S 2 or more Therefore, it is determined that the driver's arousal state is in an appropriate state, and the awakening state inducing device 120 terminates the blowing of cold air to the driver's hand.
  • the temperature change detection function of the control device 110 detects the change state of the driver's hand temperature based on the driver's hand temperature detected by the hand temperature sensor 106. Specifically, the temperature change detection function periodically acquires the temperature data of the driver's hand from the hand temperature sensor 106, and the time series data of the hand temperature acquired from the hand temperature sensor 106 is obtained. Based on this, a moving average value of the driver's hand temperature is calculated. Further, the temperature change detection function calculates a time differential value of the moving average value based on the time series data of the calculated moving average value of the driver's hand temperature. The temperature change detection function recovers the change state of the driver's hand temperature when a time differential value of the moving average value of the driver's hand temperature is 0 or greater than 0.
  • the time differential value of the moving average value of the driver's hand temperature is a value smaller than 0 continuously for a predetermined time or longer, the cold air corresponding to the driver's arousal level is detected. It is determined that the driver's hand temperature is continuously decreasing due to the air blowing, and the change state of the driver's hand temperature is detected as a lowered state.
  • the awakening effect determination function of the control device 110 determines whether or not the awakening effect is obtained by blowing cool air to the driver's hand.
  • cool air corresponding to the driver's arousal level is blown to the driver's hand. This stimulates the peripheral autonomic nerves in the driver's hand by blowing cool air against the driver's hand and awakens the driver by contracting the peripheral blood vessels in the driver's hand This is because an awakening effect can be obtained.
  • the cool air is blown to the driver's hand part, and the peripheral blood vessels in the driver's hand part are contracted, so that the heat radiation amount in the driver's hand part is reduced.
  • the time differential value of the moving average value of the driver's hand temperature is 0 or 0. Large value. Therefore, the arousal effect determination function is obtained when a time differential value of the moving average value of the driver's hand temperature is obtained as 0 or a value greater than 0 and the change state of the hand temperature is determined to be the recovery state. Determines that an awakening effect is obtained by blowing cool air to the driver.
  • the peripheral autonomic nerve of the driver's hand is not stimulated and driving Since peripheral blood vessels in the person's hand do not contract, the awakening effect may not be obtained. Further, in this way, when the awakening effect on the driver cannot be obtained, the peripheral blood vessels in the driver's hand do not contract, so the amount of heat released in the driver's hand does not decrease. Therefore, if the blowing of cold air to the driver's hand is continued, the driver's hand temperature continuously decreases for a predetermined time or more, and the time differential value of the moving average value of the driver's hand temperature is a predetermined value.
  • the awakening effect determination function determines that the time differential value of the moving average value of the driver's hand temperature is continuously smaller than 0 for a predetermined time or more and the change state of the hand temperature is in a lowered state. In this case, it is determined that the awakening effect for awakening the driver cannot be obtained.
  • the hand temperature of the driver is greatly reduced (for example, a first change rate R 1 or more).
  • the predetermined time or longer decrease in drop small hand portion temperature of the driver (for example, the second change rate R 2 less change rate smaller than the first change rate R 1 ), It is determined that the awakening effect on the driver is not obtained.
  • the control function of the control device 110 is determined when it is determined that the awakening effect on the driver is not sufficiently obtained by blowing cool air to the driver's hand as a result of the determination by the awakening effect determination function. Then, the wakefulness state inducing device 120 stops the blowing of cold air according to the driver's arousal level, and the notification device 130 notifies the driver of an alarm to stop driving the vehicle.
  • the notification device 130 is, for example, a display or a speaker provided in the navigation device. Under the control of the control device 110, the notification device 130 warns the driver that the driver's arousal level is low and stops driving the vehicle. A warning to this effect is given.
  • FIG. 3 is a flowchart showing the arousal state induction process according to the present embodiment.
  • the driver's arousal level is detected by the waking state detection function of the control device 110.
  • the arousal level detection function performs the eye open / close determination of the driver based on the image data acquired from the face image capturing camera 105, and calculates the integrated value of the number of eyes closed during a predetermined time. Can be detected.
  • step S102 the arousal state induction function of the control device 110, awareness of the driver is judged as to whether or not the first reference values S 1 following the predetermined are carried out. If awareness of the driver is the first reference values S 1 following the predetermined, the operation proceeds to step S103, whereas, if the awareness of the driver is greater than the first reference values S 1 given, the step Return to S101.
  • step S103 since it is determined that the driver's arousal level is equal to or lower than a predetermined reference value, the driver's arousal state is in a low state, and the driver is likely to fall asleep. Therefore, in order to guide the driver's arousal state that is low to an appropriate state, in step S103, the driver's hand cooling process is started by the awake state induction function of the control device 110.
  • the wakefulness induction function causes the wakefulness induction device 120 to generate cold air of 10 ° C., which is the lowest temperature in the temperature range in which the cold sensation is stimulated by skin temperature sensation, Air is blown to the driver's hand from the outlet provided in the wakefulness induction device 120. As a result, the driver's hand is stimulated by the cold air, and the driver's awakening state that is low can be guided to an appropriate state.
  • step S104 the moving average value of the driver's hand temperature is calculated based on the time-series data of the driver's hand temperature acquired from the hand temperature sensor 106 by the temperature change detection function of the control device 110. Is called. Further, the temperature change detection function performs a differentiation operation on the calculated moving average value of the driver's hand temperature, and calculates a time differential value of the moving average value.
  • step S105 the change state of the driver's hand temperature is detected by the temperature change detection function based on the time differential value of the moving average value of the driver's hand temperature calculated in step S104.
  • the temperature change detection function indicates the change state of the driver's hand temperature when the time differential value of the moving average value of the driver's hand temperature is 0 or greater than 0. Detected as a recovery state.
  • the time differential value of the moving average value of the hand temperature continues for a predetermined time or more and is smaller than 0, the change state of the driver's hand temperature is detected as a lowered state. To do.
  • step S106 it is determined whether or not the driver's hand temperature has been continuously decreased for a predetermined time or more based on the change state of the driver's hand temperature detected in step S105 by the awakening effect determination function.
  • the awakening effect determination function is a state in which the change state of the driver's hand temperature is in a lowered state, and after the driver's hand temperature is greatly reduced, the driver's hand temperature is further continued for a predetermined time or longer.
  • the hand temperature is small, it is determined that the awakening effect by the cool air blowing on the driver's hand is not obtained, and the process proceeds to step S107.
  • the awakening effect determination function determines with the awakening effect by the cold wind blowing with respect to a driver
  • step S107 since it is determined that the awakening effect by the blowing of the cold wind on the driver's hand is not obtained, the control function of the control device 110 causes the awakening state guiding device 120 to send the cool air to the driver's hand. Stop air blowing.
  • step S108 the control function performs warning processing that causes the notification device 130 to give a warning to the driver, such as stopping the driving of the vehicle.
  • step S106 it is determined that the driver's hand temperature has not continuously decreased for a predetermined time or more, and it has been determined that the awakening effect of the cool air blow to the driver's hand is obtained. In the case, the process proceeds to step S109.
  • step S109 the driver's arousal level is detected as in step S101.
  • step S110 the arousal state induction function of the control device 110, awareness of the driver is, the second reference value S 2 or more at which a determination is made as to whether greater than the first reference value S 1.
  • step S111 the arousal state guiding function, blowing cold air is terminated for the hand of the driver due to the awake state induction device 120.
  • step S104 the process returns to step S104, until the awareness of the driver is the second reference value S 2 or more, the cold air against the hand of the driver Continues.
  • FIG. 4 is a diagram showing an example of the driver's hand temperature and its moving average value in a scene where the driver's awakening effect is obtained by blowing cool air to the driver's hand.
  • FIG. 5 is a diagram illustrating an example of a driver's hand temperature and a moving average value thereof in a scene in which a driver's awakening effect is not obtained due to cool air blowing to the driver's hand. 4 and 5, the horizontal axis indicates time, and the vertical axis indicates temperature. Further, in FIGS. 4 and 5, the change tendency of the moving average value of the driver's hand temperature is indicated by a white arrow.
  • step S102 Yes
  • the temperature of the driver's hand is greatly reduced by starting the blowing of cold air corresponding to the driver's arousal level with respect to the driver's hand (step S103).
  • the moving average value of the driver's hand temperature is also greatly reduced.
  • the peripheral blood vessels in the driver's hand contract, thereby radiating heat in the driver's hand Therefore, the decrease in the moving average value of the driver's hand temperature stops.
  • the temperature change detection function calculates the time differential value of the moving average value of the driver's hand temperature as 0 or a value greater than 0 (step S104), and the change state of the driver's hand temperature is determined. It is detected as a recovery state (step S105).
  • step S110 Yes
  • step S ⁇ b> 103 by starting the blowing of cold air corresponding to the driver's arousal level to the driver's hand (step S ⁇ b> 103), the driving is performed.
  • the temperature of the driver's hand is greatly reduced, and the moving average value of the driver's hand temperature is also greatly reduced.
  • the peripheral blood vessels in the driver's hand are not contracted even if cold air is blown to the driver's hand according to the driver's arousal level. Even after elapse, the moving average value of the driver's hand temperature continues to decrease.
  • the time change value of the moving average value of the driver's hand temperature is calculated as a value smaller than 0 continuously for a predetermined time or more by the temperature change detection function (step S104).
  • the change state of the part temperature is detected as a lowered state (step S105).
  • the navigation system 1000 has a low driver's arousal level, and when driving cool air corresponding to the driver's awakening level to the driver's hand, The driver's hand temperature is measured, and the change state of the driver's hand temperature is detected based on the measured driver's hand temperature. Then, when the driver's hand temperature is continuously decreased for a predetermined time or more, it is determined that the peripheral blood vessels of the driver's hand are not contracted. In contrast, it is determined that the awakening effect by blowing cool air cannot be obtained, and the blowing of cold air to the driver's hand is stopped.
  • the awakening effect by the blowing of the cool air to the driver's hand If the awakening effect is not obtained by blowing cold air to the driver's hand, the cooling air flow is stopped by stopping the blowing of cold air to the driver's hand. The discomfort given to the driver by blowing air can be suppressed. Further, in this embodiment, when it is determined that the awakening effect by blowing cool air to the driver's hand cannot be obtained, a warning that the driving of the vehicle is stopped is given to the driver.
  • the wakefulness effect cannot be obtained by blowing cool air to the driver's hand, it is possible to effectively prevent the driver's wakefulness from being lowered by other means such as a warning.
  • the moving average value of the driver's hand temperature is calculated, and the change state of the driver's hand temperature is detected based on the time differential value of the calculated moving hand temperature average value.
  • the change state of the driver's hand temperature is detected based on the time differential value of the calculated moving hand temperature average value.
  • a time differential value is calculated for the moving average value of the driver's hand temperature, and a change state of the driver's hand temperature is detected based on the calculated time derivative value. It is possible to appropriately detect whether the change in the hand temperature of the person is in the recovery state or the reduction state.
  • the awakening effect by the cool air blowing on the driver's hand is obtained.
  • the present invention is not limited to this configuration. For example, the increase in the temperature of the hand of the driver after the blowing of cold air according to the driver's arousal level is completed. It is good also as a structure which determines whether the awakening effect was acquired based on the degree.
  • the arousal effect determination function is, for example, when the rate of change of the hand temperature of the driver after finishing the blowing of cold air according to the driver's arousal level is equal to or higher than a predetermined rate of change. It can be determined that the awakening effect on the driver is obtained. As a result, even when the awakening effect cannot be determined based on the change state of the driver's hand temperature, the driver's hand temperature rises after the cool air blowing is finished according to the driver's arousal level. Based on the degree, it can be appropriately determined whether or not the awakening effect on the driver is obtained.
  • a driver's brain wave signal such as a driver's brain wave, heart rate, and skin potential is detected by a biological signal sensor (not shown), and the detected driver's brain wave signal during driving and the brain wave of the driver before driving are detected. It is good also as a structure which detects a driver
  • the configuration in which the wind of the temperature according to the driver's arousal level is blown from the outlet provided in the arousal state guidance device 120 is illustrated, but the configuration of the outlet is not particularly limited, For example, a dedicated air outlet for inducing the driver's arousal state may be provided, or the air outlet for adjusting the temperature in the passenger compartment is blown with cool air according to the driver's arousal level. It may be used also as a blowout port for the purpose.
  • control device 110 of the above-described embodiment is a wakefulness detection means, a temperature change detection means, a wakefulness effect determination means, and a control means of the present invention
  • the wakefulness induction device 120 is a driver state guidance means of the present invention.
  • the hand temperature sensor 106 corresponds to the hand temperature measuring means of the present invention
  • the notification device 130 corresponds to the notification means of the present invention.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Traffic Control Systems (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

A driving assistance device comprises: an alertness degree detection means for detecting a degree of alertness of a driver; a driver state inducing means (120) for blowing cold air on the driver's hand parts according to the driver's degree of alertness when the driver's degree of alertness is at or below a prescribed value; a hand part temperature measurement means (106) for measuring the temperature of the driver's hand parts; a temperature change detection means for detecting a change state of the temperature of the hand parts on the basis of the result of the measurement of the hand part temperature measurement means; a notification means for notifying the driver with an alert; an alertness effect assessment means for assessing whether an alertness effect has been obtained for the driver by the blowing of the cold air according to the degree of alertness based on the change state of the temperature of the hand parts; and a control means for stopping the driver state inducing means from blowing the cold air according to the driver's degree of alertness when it is assessed that the alertness effect is not being obtained.

Description

運転支援装置および運転支援方法Driving support device and driving support method
　本発明は、運転支援装置および運転支援方法に関するものである。
　なお、文献の参照による組み込みが認められる指定国については、２０１１年７月４日に日本国において特許出願された特願２０１１―１４７９５４号の出願書類に記載された内容を参照により本出願に組み込み、本出願の記載の一部とする。 The present invention relates to a driving support device and a driving support method.
For designated countries where incorporation by reference of documents is permitted, the contents described in the application documents of Japanese Patent Application No. 2011-14795 filed in Japan on July 4, 2011 are incorporated into this application by reference. , Part of the description of this application.
　従来より、運転中に居眠りすることを防止するため、運転者の覚醒度が低下した場合に、運転者の手部に対して冷風を送風する技術が知られている（たとえば、特許文献１）。 2. Description of the Related Art Conventionally, a technique for blowing cool air to a driver's hand when the driver's arousal level is reduced is known in order to prevent the driver from falling asleep during driving (for example, Patent Document 1). .
特開２００４－５０８８８号公報JP 2004-50888 A
　しかしながら、従来技術では、運転者の体調や冷え症などの運転者の体質によっては、運転者の手部に対して冷風を送風することによる、運転者に対する覚醒効果が十分に得られない場合があり、このような場合に、運転者の覚醒状態を適切に誘導することができず、運転者に不快感を与えてしまうおそれがあった。 However, in the prior art, depending on the driver's physical condition and the driver's constitution such as coldness, the driver may not be able to sufficiently obtain the awakening effect by blowing cool air against the driver's hand. In such a case, the driver's arousal state cannot be appropriately induced, and the driver may be uncomfortable.
　本発明が解決しようとする課題は、運転者の覚醒状態を適切に誘導可能な運転支援装置および運転支援方法を提供することである。 The problem to be solved by the present invention is to provide a driving support device and a driving support method that can appropriately guide the driver's arousal state.
　本発明は、覚醒度に応じた冷風を運転者の手部に対して送風している際の運転者の手部温度の変化状態に基づいて、運転者の手部に対して冷風を送風することによる覚醒効果が得られたか否かを判定し、覚醒効果が得られていないと判定された場合には、覚醒度に応じた冷風の送風を中止することで、上記課題を解決する。 The present invention blows cold air to the driver's hand based on the change state of the driver's hand temperature when the cool air corresponding to the arousal level is being blown to the driver's hand. It is determined whether or not the awakening effect is obtained, and when it is determined that the awakening effect is not obtained, the above problem is solved by stopping the blowing of the cold air according to the awakening degree.
　本発明によれば、運転者の手部に対して冷風を送風することによる覚醒効果が得られたか否かを判定し、覚醒効果が得られていない場合に、冷風の送風を中止することで、運転者の不快感を抑制することができる。 According to the present invention, it is determined whether or not the awakening effect is obtained by blowing cool air to the driver's hand, and when the awakening effect is not obtained, the blowing of the cold air is stopped. , Driver discomfort can be suppressed.
本実施形態に係るナビゲーションシステムの車両配置関係を示す図である。It is a figure which shows the vehicle arrangement | positioning relationship of the navigation system which concerns on this embodiment. 本実施形態に係るナビゲーションシステムの構成を示す構成図である。It is a block diagram which shows the structure of the navigation system which concerns on this embodiment. 本実施形態に係る覚醒状態誘導処理を示すフローチャートである。It is a flowchart which shows the arousal state induction | guidance | derivation process which concerns on this embodiment. 運転者の手部に対する冷風の送風による覚醒効果が得られた場面における、運転者の手部温度およびその移動平均値の一例を示すグラフである。It is a graph which shows an example of a driver | operator's hand part temperature and its moving average value in the scene where the awakening effect by the ventilation of the cold wind with respect to a driver | operator's hand part was acquired. 運転者の手部に対する冷風の送風による覚醒効果が得られない場面における、運転者の手部温度およびその移動平均値の一例を示すグラフである。It is a graph which shows an example of a driver | operator's hand part temperature and its moving average value in the scene where the awakening effect by the ventilation of the cold wind with respect to a driver | operator's hand part is not acquired.
　以下、本発明の実施形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１は、本実施形態に係るナビゲーションシステム１０００の車両配置関係を示す図である。また、図２は、第１実施形態に係るナビゲーションシステム１０００の構成を示す構成図である。 FIG. 1 is a diagram showing a vehicle arrangement relationship of the navigation system 1000 according to the present embodiment. FIG. 2 is a configuration diagram showing the configuration of the navigation system 1000 according to the first embodiment.
　図２に示すように、本実施形態に係るナビゲーションシステム１０００は、操舵角センサ１０１、車速センサ１０２、アクセル開度センサ１０３、加速度センサ１０４、顔画像撮像カメラ１０５、手部温度センサ１０６、制御装置１１０、および覚醒状態誘導装置１２０を備える。これらの装置は、ＣＡＮ（Controller Area Network）その他の車載ＬＡＮによって接続され、相互に情報の授受を行う。 As shown in FIG. 2, the navigation system 1000 according to this embodiment includes a steering angle sensor 101, a vehicle speed sensor 102, an accelerator opening sensor 103, an acceleration sensor 104, a face image capturing camera 105, a hand temperature sensor 106, and a control device. 110, and an arousal state inducing device 120. These devices are connected by a CAN (Controller Area Network) or other vehicle-mounted LAN, and exchange information with each other.
　操舵角センサ１０１は、ステアリングコラム内に設置され、ステアリングの操舵角（回転角度）を検出する。操舵角センサ１０１により検出されたステアリングの操舵角の情報は、制御装置１１０に送信される。 The steering angle sensor 101 is installed in the steering column and detects the steering angle (rotation angle) of the steering. Information on the steering angle of the steering detected by the steering angle sensor 101 is transmitted to the control device 110.
　車速センサ１０２は、自車両の車速を検出する。車速センサ１０２により検出された自車両の車速情報は、制御装置１１０に送信される。 The vehicle speed sensor 102 detects the vehicle speed of the host vehicle. The vehicle speed information of the host vehicle detected by the vehicle speed sensor 102 is transmitted to the control device 110.
　アクセル開度センサ１０３は、アクセルペダルに設置され、運転者によるアクセルペダルの踏み込み量（ストローク量）を検出する。アクセル開度センサ１０３により検出されたストローク量の情報は、制御装置１１０に送信される。 The accelerator opening sensor 103 is installed on the accelerator pedal and detects the amount of depression (stroke amount) of the accelerator pedal by the driver. Information on the stroke amount detected by the accelerator opening sensor 103 is transmitted to the control device 110.
　加速度センサ１０４は、自車両に発生する横方向の加速度を検出する。加速度センサ１０４により検出された加速度の情報は、制御装置１１０に送信される。 The acceleration sensor 104 detects lateral acceleration generated in the host vehicle. Information on acceleration detected by the acceleration sensor 104 is transmitted to the control device 110.
　顔画像撮像カメラ１０５は、図１に示すように、運転者の正面のインストルメントパネル内に設置されており、運転者の顔面部の撮像を行う。顔画像撮像カメラ１０５により撮像された運転者の顔面部の画像データは、制御装置１１０に送信される。 As shown in FIG. 1, the face image capturing camera 105 is installed in an instrument panel in front of the driver, and images the face portion of the driver. Image data of the driver's face captured by the face image capturing camera 105 is transmitted to the control device 110.
　手部温度センサ１０６は、運転者の手部の温度（以下、手部温度ともいう）を検出する。このような手部温度センサ１０６としては、たとえば、熱電対からなる温度センサが挙げられる。本実施形態において、手部温度センサ１０６は、図１に示すように、ステアリングホイールのうち運転者に握られる可能性の高い位置に設けられている。なお、手部温度センサ１０６を、ステアリングホイール全体に設ける構成としてもよい。 The hand temperature sensor 106 detects the temperature of the driver's hand (hereinafter also referred to as hand temperature). An example of such a hand temperature sensor 106 is a temperature sensor made of a thermocouple. In the present embodiment, as shown in FIG. 1, the hand temperature sensor 106 is provided at a position on the steering wheel that is likely to be gripped by the driver. The hand temperature sensor 106 may be provided on the entire steering wheel.
　覚醒状態誘導装置１２０は、制御装置１１０の制御に従い、図１に示すように、運転者の覚醒状態を適切な状態に誘導するために、運転者の覚醒度に応じた温度の風を、運転者の手部に対して送風する。 As shown in FIG. 1, the arousal state inducing device 120 drives a wind at a temperature corresponding to the driver's arousal level in order to induce the driver's arousal state to an appropriate state, as shown in FIG. 1. Air is blown against the person's hand.
　制御装置１１０は、運転者の覚醒状態を適切に誘導するためのプログラムを格納したＲＯＭ（Read Only Memory）と、このＲＯＭに格納されたプログラムを実行するＣＰＵ（Central Processing Unit）と、アクセス可能な記憶装置として機能するＲＡＭ（Random Access Memory）とから構成される。 The control device 110 is accessible to a ROM (Read Only Memory) that stores a program for appropriately guiding the driver's arousal state and a CPU (Central Processing Unit) that executes the program stored in the ROM. It is composed of a RAM (Random Access Memory) that functions as a storage device.
　そして、制御装置１１０は、ＲＯＭに格納したプログラムをＣＰＵにより実行することにより、運転者の覚醒度を検出する覚醒度検出機能、運転者の覚醒度に応じた冷風を運転者の手部に対して送風させる覚醒状態誘導機能、運転者の手部温度の変化状態を検出する温度変化検出機能、運転者の手部に対して冷風を送風することによる覚醒効果を判定する覚醒効果判定機能、および、覚醒効果が得られていない場合の制御を行う制御機能を実現する。以下に、制御装置１１０が備える各機能について説明する。 And the control apparatus 110 performs the program stored in ROM by CPU, the awakening degree detection function which detects a driver | operator's arousal level, the cool air according to a driver | operator's arousal level with respect to a driver | operator's hand part An awakening state induction function for blowing air, a temperature change detection function for detecting a change state of a driver's hand temperature, an awakening effect determination function for determining an awakening effect by blowing cool air to the driver's hand, and A control function for performing control when the awakening effect is not obtained is realized. Below, each function with which the control apparatus 110 is provided is demonstrated.
　制御装置１１０の覚醒度検出機能は、運転者の覚醒度を検出する。たとえば、覚醒度検出機能は、顔画像撮像カメラ１０５から取得した画像データに基づいて、運転者の眼の開閉判定を行い、所定時間に発生した閉眼数の積算値を算出することで、運転者の覚醒度を検出することができる。また、覚醒度検出機能は、顔画像撮像カメラ１０５から取得した画像データに基づいて、運転者の顔の表情変化を検出することで、運転者の覚醒度を検出することもできる。この他、覚醒度検出機能は、たとえば、操舵角センサ１０１により検出された操舵角の時系列データについて周波数分析を行い、操舵角の時系列データの周波数成分のうち特定周波数の積分値に基づいて、自車両のふらつきや運転者による操舵操作の滑らかさを判断することで、運転者の覚醒度を検出することもできる。同様に、覚醒度検出機能は、加速度センサ１０４により検出された自車両の横方向の加速度の時系列データについて周波数分析を行い、自車両のふらつきや運転者による操舵操作の滑らかさを判断することで、運転者の覚醒度を検出することもできる。さらに、覚醒度検出機能は、アクセル開度センサ１０３から取得したストローク量の情報に基づいて、運転者の覚醒度を検出することもできる。また、運転者の覚醒度を検出する際には、車速センサ１０２から取得した車速情報を加味する構成としてもよい。 The wakefulness detection function of the control device 110 detects the driver's wakefulness. For example, the arousal level detection function performs the eye open / close determination of the driver based on the image data acquired from the face image capturing camera 105, and calculates the integrated value of the number of eyes closed during a predetermined time. Can be detected. The arousal level detection function can also detect the driver's arousal level by detecting changes in the facial expression of the driver based on the image data acquired from the face image capturing camera 105. In addition, for example, the arousal level detection function performs frequency analysis on the time-series data of the steering angle detected by the steering angle sensor 101, and based on the integrated value of the specific frequency among the frequency components of the time-series data of the steering angle. The driver's arousal level can also be detected by judging the wobbling of the host vehicle and the smoothness of the steering operation by the driver. Similarly, the arousal level detection function performs frequency analysis on the time-series data of the lateral acceleration of the host vehicle detected by the acceleration sensor 104, and determines whether the host vehicle is wobbling or the smoothness of the steering operation by the driver. Thus, the driver's arousal level can be detected. Further, the arousal level detection function can also detect the driver's arousal level based on the stroke amount information acquired from the accelerator opening sensor 103. Further, when detecting the driver's arousal level, the vehicle speed information acquired from the vehicle speed sensor 102 may be taken into account.
　制御装置１１０の覚醒状態誘導機能は、覚醒度検出機能により検出された運転者の覚醒度が、所定の第１基準値Ｓ１以下であるか否かを判断する。ここで、所定の第１基準値Ｓ１とは、たとえば、運転者の覚醒度が低く、運転者が居眠りする可能性があるか否かを判断するための基準値である。覚醒状態誘導機能は、運転者の覚醒度が第１基準値Ｓ１以下であると判断した場合には、運転者の覚醒度が低く、運転者が居眠りする可能性があると判断し、覚醒状態誘導装置１２０に、運転者の覚醒度に応じた冷風を、運転者の手部に対して送風させる。具体的には、覚醒状態誘導機能は、覚醒状態誘導装置１２０に、覚醒状態誘導装置１２０に備えるチャンバーにおいて、車外から取り込んだ外気と、覚醒状態誘導装置１２０に備えるエバポレーターにより冷却した空気とを混合して、皮膚温感感覚にて冷感を刺激する温度域のうち最も低温である１０℃の冷風を生成させ、生成した冷風を、覚醒状態誘導装置１２０に備える吹き出し口から、運転者の手部に対して送風させる。これにより、運転者の末梢自律神経を刺激することができ、運転者の覚醒状態を適切な状態に誘導することができる。 Arousal guiding function of the control device 110, awareness of the driver detected by the alertness detection function determines whether a predetermined first reference values S 1 or less. Here, the first reference values S 1 given, for example, low awareness of the driver, which is a reference value for determining whether the driver is likely to snooze. Wakefulness guiding function, when the wakefulness of the driver is determined to be the first reference values S 1 or less has a low awareness of the driver, determines that the driver is likely to doze, awake The state induction device 120 is caused to blow cool air corresponding to the driver's arousal level to the driver's hand. Specifically, the wakefulness induction function mixes the wakefulness induction device 120 with the outside air taken from outside the vehicle and the air cooled by the evaporator provided in the wakefulness induction device 120 in the chamber provided in the wakefulness induction device 120. Then, the cold air of 10 ° C. which is the lowest temperature in the temperature range in which the cold sensation is stimulated by the skin temperature sensation is generated, and the generated cold air is passed through the outlet provided in the wakefulness induction device 120 from the driver Air is blown against the part. Thereby, a driver | operator's peripheral autonomic nerve can be stimulated and a driver | operator's arousal state can be induced | guided | derived to an appropriate state.
　また、覚醒状態誘導機能は、覚醒状態誘導装置１２０により運転者の手部に対して冷風の送風が行われている際に、覚醒度検出機能により検出された運転者の覚醒度が、所定の第２基準値Ｓ２以上であるか否かを判断する。ここで、所定の第２基準値Ｓ２とは、第１基準値Ｓ１よりも大きな値であり、運転者の覚醒状態が適切な状態であるか否かを判断するための基準値である。覚醒状態誘導機能は、覚醒状態誘導装置１２０により運転者の手部に対して冷風の送風が行われている際に、運転者の覚醒度が第２基準値Ｓ２以上であると判断した場合には、運転者の覚醒状態は適切な状態になったものと判断し、覚醒状態誘導装置１２０に、運転者の手部に対する冷風の送風を終了させる。 Further, the arousal state guidance function is such that the driver's arousal level detected by the arousal level detection function is a predetermined level when cold air is blown to the driver's hand by the awake state guidance device 120. determines whether the second reference value S 2 or more. Here, the predetermined second reference value S 2, a first reference value greater than S 1, is the reference value for arousal state of the driver to determine whether the proper state . Wakefulness guiding function, when the blast of cold air is made to the hand of the driver by wakefulness induction device 120, if the awareness of the driver is determined to be the second reference value S 2 or more Therefore, it is determined that the driver's arousal state is in an appropriate state, and the awakening state inducing device 120 terminates the blowing of cold air to the driver's hand.
　制御装置１１０の温度変化検出機能は、手部温度センサ１０６により検出された運転者の手部温度に基づいて、運転者の手部温度の変化状態を検出する。具体的には、温度変化検出機能は、手部温度センサ１０６から運転者の手部の温度データを周期的に取得しており、手部温度センサ１０６から取得した手部温度の時系列データに基づいて、運転者の手部温度の移動平均値を算出する。さらに、温度変化検出機能は、算出した運転者の手部温度の移動平均値の時系列データに基づいて、該移動平均値の時間微分値を算出する。そして、温度変化検出機能は、運転者の手部温度の移動平均値の時間微分値として、０または０よりも大きい値が得られた場合には、運転者の手部温度の変化状態を回復状態として検出し、一方、運転者の手部温度の移動平均値の時間微分値が、所定時間以上継続して０よりも小さい値である場合には、運転者の覚醒度に応じた冷風の送風により運転者の手部温度が低下し続けているものと判断し、運転者の手部温度の変化状態を低下状態として検出する。 The temperature change detection function of the control device 110 detects the change state of the driver's hand temperature based on the driver's hand temperature detected by the hand temperature sensor 106. Specifically, the temperature change detection function periodically acquires the temperature data of the driver's hand from the hand temperature sensor 106, and the time series data of the hand temperature acquired from the hand temperature sensor 106 is obtained. Based on this, a moving average value of the driver's hand temperature is calculated. Further, the temperature change detection function calculates a time differential value of the moving average value based on the time series data of the calculated moving average value of the driver's hand temperature. The temperature change detection function recovers the change state of the driver's hand temperature when a time differential value of the moving average value of the driver's hand temperature is 0 or greater than 0. On the other hand, when the time differential value of the moving average value of the driver's hand temperature is a value smaller than 0 continuously for a predetermined time or longer, the cold air corresponding to the driver's arousal level is detected. It is determined that the driver's hand temperature is continuously decreasing due to the air blowing, and the change state of the driver's hand temperature is detected as a lowered state.
　制御装置１１０の覚醒効果判定機能は、運転者の手部に対して冷風を送風することによる覚醒効果が得られたか否かを判定する。ここで、本実施形態においては、運転者の覚醒度が低い場合に、運転者の手部に対して、運転者の覚醒度に応じた冷風を送風する。これは、運転者の手部に対して冷風を送風することにより、運転者の手部の末梢自律神経を刺激し、運転者の手部の末梢血管を収縮させることで、運転者を覚醒させる覚醒効果を得ることができるためである。また、運転者の手部に対して冷風を送風し、運転者の手部の末梢血管が収縮することで、運転者の手部における放熱量は小さくなる。そのため、運転者の手部の末梢血管が収縮しており、運転者に対する覚醒効果が得られている場合には、運転者の手部温度の移動平均値の時間微分値は０または０よりも大きな値となる。そこで、覚醒効果判定機能は、運転者の手部温度の移動平均値の時間微分値として、０または０よりも大きな値が得られ、手部温度の変化状態が回復状態と判定された場合には、運転者に対する冷風の送風による覚醒効果が得られたものと判定する。 The awakening effect determination function of the control device 110 determines whether or not the awakening effect is obtained by blowing cool air to the driver's hand. Here, in this embodiment, when the driver's arousal level is low, cool air corresponding to the driver's arousal level is blown to the driver's hand. This stimulates the peripheral autonomic nerves in the driver's hand by blowing cool air against the driver's hand and awakens the driver by contracting the peripheral blood vessels in the driver's hand This is because an awakening effect can be obtained. Further, the cool air is blown to the driver's hand part, and the peripheral blood vessels in the driver's hand part are contracted, so that the heat radiation amount in the driver's hand part is reduced. Therefore, when the peripheral blood vessels in the driver's hand are contracted and the awakening effect on the driver is obtained, the time differential value of the moving average value of the driver's hand temperature is 0 or 0. Large value. Therefore, the arousal effect determination function is obtained when a time differential value of the moving average value of the driver's hand temperature is obtained as 0 or a value greater than 0 and the change state of the hand temperature is determined to be the recovery state. Determines that an awakening effect is obtained by blowing cool air to the driver.
　これに対して、運転者の体調や冷え症などの運転者の体質によっては、運転者の手部に対して冷風を送風した場合でも、運転者の手部の末梢自律神経が刺激されず、運転者の手部の末梢血管の収縮が起こらないために、覚醒効果が得られない場合がある。また、このように、運転者に対する覚醒効果が得られない場合には、運転者の手部の末梢血管の収縮が起こらないため、運転者の手部における放熱量は小さくならない。そのため、運転者の手部に対する冷風の送風を継続すると、運転者の手部温度が所定時間以上継続して低下してしまい、運転者の手部温度の移動平均値の時間微分値が、所定時間以上継続して０よりも小さい値で算出される。そこで、覚醒効果判定機能は、運転者の手部温度の移動平均値の時間微分値が、所定時間以上継続して０よりも小さく、手部温度の変化状態が低下状態であると判定された場合に、運転者を覚醒させる覚醒効果が得られないものと判定する。特に、本実施形態においては、運転者を覚醒させる覚醒効果が得られているか否かをより適切に判定するため、運転者の手部温度が大きく低下（たとえば、第１変化率Ｒ１以上の変化率で低下）した後に、さらに、所定時間以上継続して、運転者の手部温度が小さく低下（たとえば、第１変化率Ｒ１よりも小さい第２変化率Ｒ２以下の変化率で低下）している場合に、運転者に対する覚醒効果が得られていないものと判定する。 On the other hand, depending on the driver's physical condition and the driver's constitution such as coldness, even when cool air is blown to the driver's hand, the peripheral autonomic nerve of the driver's hand is not stimulated and driving Since peripheral blood vessels in the person's hand do not contract, the awakening effect may not be obtained. Further, in this way, when the awakening effect on the driver cannot be obtained, the peripheral blood vessels in the driver's hand do not contract, so the amount of heat released in the driver's hand does not decrease. Therefore, if the blowing of cold air to the driver's hand is continued, the driver's hand temperature continuously decreases for a predetermined time or more, and the time differential value of the moving average value of the driver's hand temperature is a predetermined value. It is calculated as a value smaller than 0 continuously for more than time. Therefore, the awakening effect determination function determines that the time differential value of the moving average value of the driver's hand temperature is continuously smaller than 0 for a predetermined time or more and the change state of the hand temperature is in a lowered state. In this case, it is determined that the awakening effect for awakening the driver cannot be obtained. In particular, in the present embodiment, in order to more appropriately determine whether or not an awakening effect for awakening the driver is obtained, the hand temperature of the driver is greatly reduced (for example, a first change rate R 1 or more). after reduction) at the change rate, further, the predetermined time or longer, decrease in drop small hand portion temperature of the driver (for example, the second change rate R 2 less change rate smaller than the first change rate R 1 ), It is determined that the awakening effect on the driver is not obtained.
　制御装置１１０の制御機能は、覚醒効果判定機能による判定の結果、運転者の手部に対して冷風を送風することによる、運転者に対する覚醒効果が十分に得られていないと判定された場合に、覚醒状態誘導装置１２０に、運転者の覚醒度に応じた冷風の送風を中止させるとともに、報知装置１３０に、運転者に対して、車両の運転を中止する旨の警報を報知させる。 The control function of the control device 110 is determined when it is determined that the awakening effect on the driver is not sufficiently obtained by blowing cool air to the driver's hand as a result of the determination by the awakening effect determination function. Then, the wakefulness state inducing device 120 stops the blowing of cold air according to the driver's arousal level, and the notification device 130 notifies the driver of an alarm to stop driving the vehicle.
　報知装置１３０は、たとえば、ナビゲーション装置に備えられたディスプレイまたはスピーカーであり、制御装置１１０の制御に従って、運転者に対して、運転者の覚醒度が低い旨の警告や、車両の運転を中止する旨の警告を行う。 The notification device 130 is, for example, a display or a speaker provided in the navigation device. Under the control of the control device 110, the notification device 130 warns the driver that the driver's arousal level is low and stops driving the vehicle. A warning to this effect is given.
　続いて、図３を参照して、本実施形態に係る覚醒状態誘導処理について説明する。ここで、図３は、本実施形態に係る覚醒状態誘導処理を示すフローチャートである。 Subsequently, the arousal state induction process according to the present embodiment will be described with reference to FIG. Here, FIG. 3 is a flowchart showing the arousal state induction process according to the present embodiment.
　まず、ステップＳ１０１では、制御装置１１０の覚醒状態検出機能により、運転者の覚醒度の検出が行われる。たとえば、覚醒度検出機能は、顔画像撮像カメラ１０５から取得した画像データに基づいて、運転者の眼の開閉判定を行い、所定時間に発生した閉眼数の積算値を算出することで、運転者の覚醒度を検出することができる。 First, in step S101, the driver's arousal level is detected by the waking state detection function of the control device 110. For example, the arousal level detection function performs the eye open / close determination of the driver based on the image data acquired from the face image capturing camera 105, and calculates the integrated value of the number of eyes closed during a predetermined time. Can be detected.
　ステップＳ１０２では、制御装置１１０の覚醒状態誘導機能により、運転者の覚醒度が所定の第１基準値Ｓ１以下であるか否かの判断が行われる。運転者の覚醒度が所定の第１基準値Ｓ１以下である場合には、ステップＳ１０３に進み、一方、運転者の覚醒度が所定の第１基準値Ｓ１よりも大きい場合には、ステップＳ１０１に戻る。 In step S102, the arousal state induction function of the control device 110, awareness of the driver is judged as to whether or not the first reference values S 1 following the predetermined are carried out. If awareness of the driver is the first reference values S 1 following the predetermined, the operation proceeds to step S103, whereas, if the awareness of the driver is greater than the first reference values S 1 given, the step Return to S101.
　ステップＳ１０３では、運転者の覚醒度が所定の基準値以下であると判断されているため、運転者の覚醒状態は低い状態にあり、運転者は居眠りする可能性があるものと考えられる。そこで、低くなっている運転者の覚醒状態を適切な状態に誘導するために、ステップＳ１０３では、制御装置１１０の覚醒状態誘導機能により、運転者手部冷却処理が開始される。具体的には、覚醒状態誘導機能は、覚醒状態誘導装置１２０に、皮膚温感感覚にて冷感を刺激する温度域のうち最も低温である１０℃の冷風を生成させ、生成した冷風を、覚醒状態誘導装置１２０に備える吹き出し口から、運転者の手部に対して送風させる。これにより、運転者の手部が冷風により刺激され、低くなっている運転者の覚醒状態を適切な状態に誘導することができる。 In step S103, since it is determined that the driver's arousal level is equal to or lower than a predetermined reference value, the driver's arousal state is in a low state, and the driver is likely to fall asleep. Therefore, in order to guide the driver's arousal state that is low to an appropriate state, in step S103, the driver's hand cooling process is started by the awake state induction function of the control device 110. Specifically, the wakefulness induction function causes the wakefulness induction device 120 to generate cold air of 10 ° C., which is the lowest temperature in the temperature range in which the cold sensation is stimulated by skin temperature sensation, Air is blown to the driver's hand from the outlet provided in the wakefulness induction device 120. As a result, the driver's hand is stimulated by the cold air, and the driver's awakening state that is low can be guided to an appropriate state.
　ステップＳ１０４では、制御装置１１０の温度変化検出機能により、手部温度センサ１０６から取得した運転者の手部温度の時系列データに基づいて、運転者の手部温度の移動平均値の算出が行われる。さらに、温度変化検出機能は、算出した運転者の手部温度の移動平均値について微分演算を行い、該移動平均値の時間微分値を算出する。 In step S104, the moving average value of the driver's hand temperature is calculated based on the time-series data of the driver's hand temperature acquired from the hand temperature sensor 106 by the temperature change detection function of the control device 110. Is called. Further, the temperature change detection function performs a differentiation operation on the calculated moving average value of the driver's hand temperature, and calculates a time differential value of the moving average value.
　そして、ステップＳ１０５では、温度変化検出機能により、ステップＳ１０４で算出した運転者の手部温度の移動平均値の時間微分値に基づいて、運転者の手部温度の変化状態の検出が行われる。具体的には、温度変化検出機能は、運転者の手部温度の移動平均値の時間微分値が、０である場合、または０よりも大きい場合に、運転者の手部温度の変化状態を回復状態として検出し、一方、手部温度の移動平均値の時間微分値が、所定時間以上継続して、０よりも小さい場合には、運転者の手部温度の変化状態を低下状態として検出する。 In step S105, the change state of the driver's hand temperature is detected by the temperature change detection function based on the time differential value of the moving average value of the driver's hand temperature calculated in step S104. Specifically, the temperature change detection function indicates the change state of the driver's hand temperature when the time differential value of the moving average value of the driver's hand temperature is 0 or greater than 0. Detected as a recovery state. On the other hand, if the time differential value of the moving average value of the hand temperature continues for a predetermined time or more and is smaller than 0, the change state of the driver's hand temperature is detected as a lowered state. To do.
　ステップＳ１０６では、覚醒効果判定機能により、ステップＳ１０５で検出された運転者の手部温度の変化状態に基づいて、運転者の手部温度が所定時間以上継続して低下しているか否かの判断が行われる。具体的には、覚醒効果判定機能は、運転者の手部温度の変化状態が低下状態であり、運転者の手部温度が大きく低下した後に、さらに、所定時間以上継続して、運転者の手部温度が小さく低下している場合には、運転者の手部に対する冷風の送風による覚醒効果が得られていないものと判定し、ステップＳ１０７に進む。一方、覚醒効果判定機能は、ステップＳ１０５で検出された運転者の手部温度の変化状態が回復状態であり、運転者の手部温度が所定時間以上継続して低下していない場合には、運転者の手部に対する冷風の送風による覚醒効果が得られているものと判定し、ステップＳ１０９に進む。 In step S106, it is determined whether or not the driver's hand temperature has been continuously decreased for a predetermined time or more based on the change state of the driver's hand temperature detected in step S105 by the awakening effect determination function. Is done. Specifically, the awakening effect determination function is a state in which the change state of the driver's hand temperature is in a lowered state, and after the driver's hand temperature is greatly reduced, the driver's hand temperature is further continued for a predetermined time or longer. When the hand temperature is small, it is determined that the awakening effect by the cool air blowing on the driver's hand is not obtained, and the process proceeds to step S107. On the other hand, when the driver's hand temperature change state detected in step S105 is in a recovery state and the driver's hand temperature has not continuously decreased for a predetermined time or longer, the awakening effect determination function is It determines with the awakening effect by the cold wind blowing with respect to a driver | operator's hand part being acquired, and progresses to step S109.
　ステップＳ１０７では、運転者の手部に対する冷風の送風による覚醒効果が得られていないと判定されているため、制御装置１１０の制御機能は、覚醒状態誘導装置１２０に、運転者の手部に対する冷風の送風を中止させる。また、ステップＳ１０８において、制御機能は、報知装置１３０に、運転者に対して、車両の運転を中止する旨などの警告を行わせる警告処理を行う。 In step S107, since it is determined that the awakening effect by the blowing of the cold wind on the driver's hand is not obtained, the control function of the control device 110 causes the awakening state guiding device 120 to send the cool air to the driver's hand. Stop air blowing. In step S108, the control function performs warning processing that causes the notification device 130 to give a warning to the driver, such as stopping the driving of the vehicle.
　一方、ステップＳ１０６において、運転者の手部温度が所定時間以上継続して低下していないものと判断され、運転者の手部に対する冷風の送風による覚醒効果が得られているものと判定された場合には、ステップＳ１０９に進む。ステップＳ１０９では、ステップＳ１０１と同様に、運転者の覚醒度の検出が行われる。そして、ステップＳ１１０では、制御装置１１０の覚醒状態誘導機能により、運転者の覚醒度が、第１基準値Ｓ１よりも大きい第２基準値Ｓ２以上であるか否かの判断が行われる。運転者の覚醒度が第２基準値Ｓ２以上である場合には、ステップＳ１１１に進み、覚醒状態誘導機能により、覚醒状態誘導装置１２０による運転者の手部に対する冷風の送風が終了される。一方、運転者の覚醒度が第２基準値Ｓ２未満である場合には、ステップＳ１０４に戻り、運転者の覚醒度が第２基準値Ｓ２以上となるまで、運転者の手部に対する冷風の送風が継続される。 On the other hand, in step S106, it is determined that the driver's hand temperature has not continuously decreased for a predetermined time or more, and it has been determined that the awakening effect of the cool air blow to the driver's hand is obtained. In the case, the process proceeds to step S109. In step S109, the driver's arousal level is detected as in step S101. At step S110, the arousal state induction function of the control device 110, awareness of the driver is, the second reference value S 2 or more at which a determination is made as to whether greater than the first reference value S 1. Awareness of the driver is in the case where the second reference value S 2 or more, the process proceeds to step S111, the arousal state guiding function, blowing cold air is terminated for the hand of the driver due to the awake state induction device 120. On the other hand, when the awareness of the driver is smaller than the second reference value S 2, the process returns to step S104, until the awareness of the driver is the second reference value S 2 or more, the cold air against the hand of the driver Continues.
　続いて、図４および図５を参照して、本実施形態に係るナビゲーションシステム１０００の動作について説明する。ここで、図４は、運転者の手部に対する冷風の送風による、運転者に対する覚醒効果が得られた場面における、運転者の手部温度およびその移動平均値の一例を示す図である。また、図５は、運転者の手部に対する冷風の送風による、運転者に対する覚醒効果が得られない場面における、運転者の手部温度およびその移動平均値の一例を示す図である。なお、図４および図５においては、横軸は時間、縦軸は温度を示している。また、図４および図５においては、運転者の手部温度の移動平均値の変化の傾向を、白抜きの矢印で示している。さらに、図４および図５に示す例では、運転者の覚醒度が所定の第１基準値Ｓ１以下であり（ステップＳ１０２＝Ｙｅｓ）、運転者の手部に対して、運転者の覚醒度に応じた冷風の送風が行われている際の運転者の手部温度およびその移動平均値を例示している。 Subsequently, the operation of the navigation system 1000 according to the present embodiment will be described with reference to FIGS. 4 and 5. Here, FIG. 4 is a diagram showing an example of the driver's hand temperature and its moving average value in a scene where the driver's awakening effect is obtained by blowing cool air to the driver's hand. FIG. 5 is a diagram illustrating an example of a driver's hand temperature and a moving average value thereof in a scene in which a driver's awakening effect is not obtained due to cool air blowing to the driver's hand. 4 and 5, the horizontal axis indicates time, and the vertical axis indicates temperature. Further, in FIGS. 4 and 5, the change tendency of the moving average value of the driver's hand temperature is indicated by a white arrow. Further, in the example shown in FIGS. 4 and 5, awareness of the driver is at the first reference values S 1 following a predetermined (step S102 = Yes), with respect to the hand of the driver, the driver's alertness The temperature of the driver's hand and the moving average value when the cool air is blown according to the are illustrated.
　図４に示す例では、運転者の手部に対して、運転者の覚醒度に応じた冷風の送風が開始されることで（ステップＳ１０３）、運転者の手部の温度が大きく低下し、これにより、運転者の手部温度の移動平均値も大きく低下している。一方、運転者の手部に対して、運転者の覚醒度に応じた冷風の送風が行われると、運転者の手部の末梢血管が収縮し、これにより、運転者の手部における放熱量が小さくなるため、運転者の手部温度の移動平均値の低下は止まる。その結果、温度変化検出機能により、運転者の手部温度の移動平均値の時間微分値が、０または０よりも大きい値で算出され（ステップＳ１０４）、運転者の手部温度の変化状態が回復状態として検出される（ステップＳ１０５）。このように、図４に示す例では、運転者の覚醒度に応じた冷風の送風の開始直後に、運転者の手部温度の移動平均値が大きく低下しているが、その後、所定時間以上継続して、運転者の手部温度が低下していないため、覚醒効果判定機能は、運転者の手部に対する冷風の送風による覚醒効果が得られたものと判定する（ステップＳ１０６＝Ｙｅｓ）。そして、運転者の覚醒度に応じた冷風の送風により、運転者の覚醒度が所定の第２基準値Ｓ２以上となった場合に（ステップＳ１１０＝Ｙｅｓ）、運転者の手部に対する冷風の送風が終了される（ステップＳ１１１）。 In the example shown in FIG. 4, the temperature of the driver's hand is greatly reduced by starting the blowing of cold air corresponding to the driver's arousal level with respect to the driver's hand (step S103). As a result, the moving average value of the driver's hand temperature is also greatly reduced. On the other hand, when cold air blowing according to the driver's arousal level is performed on the driver's hand, the peripheral blood vessels in the driver's hand contract, thereby radiating heat in the driver's hand Therefore, the decrease in the moving average value of the driver's hand temperature stops. As a result, by the temperature change detection function, the time differential value of the moving average value of the driver's hand temperature is calculated as 0 or a value greater than 0 (step S104), and the change state of the driver's hand temperature is determined. It is detected as a recovery state (step S105). As described above, in the example shown in FIG. 4, the moving average value of the hand temperature of the driver is greatly reduced immediately after the start of the blowing of the cold air according to the driver's arousal level. Since the driver's hand temperature does not decrease continuously, the awakening effect determination function determines that the awakening effect by the blowing of cool air to the driver's hand is obtained (step S106 = Yes). Then, by the blowing of cold air in accordance with the awakening level of the driver, (step S110 = Yes) when the wakefulness of the driver becomes a second reference value S 2 or more predetermined, the cold air against the hand of the driver The blowing is finished (step S111).
　また、図５に示す例でも、図４に示す例と同様に、運転者の手部に対して、運転者の覚醒度に応じた冷風の送風が開始されることで（ステップＳ１０３）、運転者の手部の温度が大きく低下し、これにより、運転者の手部温度の移動平均値も大きく低下している。しかし、図５に示す例では、運転者の手部に対して運転者の覚醒度に応じた冷風の送風が行われても、運転者の手部の末梢血管が収縮しないため、所定時間が経過しても、運転者の手部温度の移動平均値は小さく低下し続けている。そのため、温度変化検出機能により、運転者の手部温度の移動平均値の時間微分値が、所定時間以上継続して０よりも小さい値で算出され（ステップＳ１０４）、これにより、運転者の手部温度の変化状態が低下状態として検出される（ステップＳ１０５）。このように、図５に示す例では、運転者の覚醒度に応じた冷風の送風が開始された後、運転者の手部の温度が大きく低下し、さらに、所定時間以上継続して、運転者の手部温度が小さく低下しているため、覚醒効果判定機能は、運転者の手部に対する冷風の送風による覚醒効果が得られていないものと判定する（ステップＳ１０６＝Ｙｅｓ）。そして、この判定に基づいて、制御機能は、運転者の覚醒度に応じた冷風の送風を中止させ（ステップＳ１０７）、運転者に対して、運転を中止する旨の警告を出力させる（ステップＳ１０８）。 Also, in the example shown in FIG. 5, as in the example shown in FIG. 4, by starting the blowing of cold air corresponding to the driver's arousal level to the driver's hand (step S <b> 103), the driving is performed. The temperature of the driver's hand is greatly reduced, and the moving average value of the driver's hand temperature is also greatly reduced. However, in the example shown in FIG. 5, the peripheral blood vessels in the driver's hand are not contracted even if cold air is blown to the driver's hand according to the driver's arousal level. Even after elapse, the moving average value of the driver's hand temperature continues to decrease. Therefore, the time change value of the moving average value of the driver's hand temperature is calculated as a value smaller than 0 continuously for a predetermined time or more by the temperature change detection function (step S104). The change state of the part temperature is detected as a lowered state (step S105). Thus, in the example shown in FIG. 5, after the start of cool air blowing according to the driver's arousal level, the temperature of the driver's hand greatly decreases, and further continues for a predetermined time or longer. Since the hand temperature of the driver is small, the awakening effect determination function determines that the awakening effect due to the cool air blow to the driver's hand is not obtained (step S106 = Yes). Then, based on this determination, the control function stops the blowing of cold air according to the driver's arousal level (step S107), and outputs a warning to the driver to stop driving (step S108). ).
　以上のように、本実施形態に係るナビゲーションシステム１０００は、運転者の覚醒度が低く、運転者の手部に対して、運転者の覚醒度に応じた冷風を送風している際に、運転者の手部温度を計測し、計測した運転者の手部温度に基づいて、運転者の手部温度の変化状態を検出する。そして、運転者の手部温度が所定時間以上継続して低下している場合には、運転者の手部の末梢血管の収縮が起きていないものと判断されることから、運転者の手部に対して冷風を送風することによる覚醒効果は得られないものと判定し、運転者の手部に対する冷風の送風を中止する。このように、本実施形態では、運転者の覚醒度に応じた冷風を送風している際の運転者の手部温度の変化状態に基づいて、運転者の手部に対する冷風の送風による覚醒効果が得られたか否かを判定することができ、運転者の手部に対する冷風の送風では覚醒効果が得られない場合には、運転者の手部に対する冷風の送風を中止することで、冷風の送風により運転者に与える不快感を抑制することができる。また、本実施形態では、運転者の手部に対して冷風を送風することによる覚醒効果は得られないものと判定した場合に、運転者に対して車両の運転を停止する旨の警告を行うことで、運転者の手部に対する冷風の送風では覚醒効果が得られない場合にも、警告などの他の手段により、運転者の覚醒度が低下することを有効に防止することができる。特に、本実施形態では、運転者の覚醒度に応じた冷風を送風している際の運転者の手部温度の変化状態に基づいて、覚醒効果が得られたか否かを判定することができるため、たとえば、運転者の手部に対する冷風の送風を終了した後に、再度、運転者の覚醒状態を検出することで、覚醒効果が得られたか否かを判定する場合と比べて、覚醒効果が得られたか否かの判定をより早いタイミングで行うことができ、その結果、警告などをより早いタイミングで行うことができる。 As described above, the navigation system 1000 according to the present embodiment has a low driver's arousal level, and when driving cool air corresponding to the driver's awakening level to the driver's hand, The driver's hand temperature is measured, and the change state of the driver's hand temperature is detected based on the measured driver's hand temperature. Then, when the driver's hand temperature is continuously decreased for a predetermined time or more, it is determined that the peripheral blood vessels of the driver's hand are not contracted. In contrast, it is determined that the awakening effect by blowing cool air cannot be obtained, and the blowing of cold air to the driver's hand is stopped. Thus, in this embodiment, based on the change state of the driver's hand temperature when the cool air is blown according to the driver's arousal level, the awakening effect by the blowing of the cool air to the driver's hand If the awakening effect is not obtained by blowing cold air to the driver's hand, the cooling air flow is stopped by stopping the blowing of cold air to the driver's hand. The discomfort given to the driver by blowing air can be suppressed. Further, in this embodiment, when it is determined that the awakening effect by blowing cool air to the driver's hand cannot be obtained, a warning that the driving of the vehicle is stopped is given to the driver. Thus, even when the wakefulness effect cannot be obtained by blowing cool air to the driver's hand, it is possible to effectively prevent the driver's wakefulness from being lowered by other means such as a warning. In particular, in the present embodiment, it is possible to determine whether or not the awakening effect is obtained based on the change state of the hand temperature of the driver when the cool air is blown according to the driver's arousal level. Therefore, for example, after the cool air blowing to the driver's hand is finished, the awakening effect is more effective than the case where it is determined whether or not the awakening effect is obtained by detecting the driver's awakening state again. It can be determined whether or not it has been obtained at an earlier timing, and as a result, a warning or the like can be performed at an earlier timing.
　さらに、本実施形態では、運転者の手部温度の移動平均値を算出し、算出した手部温度の移動平均値の時間微分値に基づいて、運転者の手部温度の変化状態を検出する。このように、本実施形態では、運転者の手部温度の移動平均値を算出することで、手部温度センサ１０６により検出された運転者の手部温度にノイズなどによる誤差が生じた場合でも、誤差の影響を抑えることができ、運転者の手部温度の変化状態をより適切に検出することができる。また、本実施形態では、運転者の手部温度の移動平均値について時間微分値を算出し、算出した時間微分値に基づいて、運転者の手部温度の変化状態を検出することで、運転者の手部温度の変化状態が、回復状態にあるか、あるいは、低下状態にあるかを適切に検出することができる。 Furthermore, in this embodiment, the moving average value of the driver's hand temperature is calculated, and the change state of the driver's hand temperature is detected based on the time differential value of the calculated moving hand temperature average value. . Thus, in this embodiment, even if an error due to noise or the like occurs in the driver's hand temperature detected by the hand temperature sensor 106 by calculating the moving average value of the driver's hand temperature. Thus, the influence of the error can be suppressed, and the change state of the driver's hand temperature can be detected more appropriately. Further, in this embodiment, a time differential value is calculated for the moving average value of the driver's hand temperature, and a change state of the driver's hand temperature is detected based on the calculated time derivative value. It is possible to appropriately detect whether the change in the hand temperature of the person is in the recovery state or the reduction state.
　以上説明した実施形態は、本発明の理解を容易にするために記載されたものであって、本発明を限定するために記載されたものではない。したがって、上記の実施形態に開示された各要素は、本発明の技術的範囲に属する全ての設計変更や均等物をも含む趣旨である。 The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
　たとえば、上述した実施形態では、運転者の覚醒度に応じた冷風を送風している際の運転者の手部温度の変化状態に基づいて、運転者の手部に対する冷風の送風による覚醒効果が得られたか否かを判定する構成を説明したが、この構成に限定されるものではなく、たとえば、運転者の覚醒度に応じた冷風の送風を終了した後の運転者の手部温度の上昇度合いに基づいて、覚醒効果が得られたか否かを判定する構成としてもよい。具体的には、覚醒効果判定機能は、たとえば、運転者の覚醒度に応じた冷風の送風を終了した後の運転者の手部温度の変化率が、所定の変化率以上である場合に、運転者に対する覚醒効果が得られたものと判定することができる。これにより、運転者の手部温度の変化状態に基づいて覚醒効果を判定することができない場合でも、運転者の覚醒度に応じた冷風の送風を終了した後の運転者の手部温度の上昇度合いに基づいて、運転者に対する覚醒効果が得られたか否かを適切に判定することができる。 For example, in the above-described embodiment, based on the change state of the driver's hand temperature when the cool air is blown according to the driver's arousal level, the awakening effect by the cool air blowing on the driver's hand is obtained. Although the configuration for determining whether or not it has been described has been described, the present invention is not limited to this configuration. For example, the increase in the temperature of the hand of the driver after the blowing of cold air according to the driver's arousal level is completed. It is good also as a structure which determines whether the awakening effect was acquired based on the degree. Specifically, the arousal effect determination function is, for example, when the rate of change of the hand temperature of the driver after finishing the blowing of cold air according to the driver's arousal level is equal to or higher than a predetermined rate of change. It can be determined that the awakening effect on the driver is obtained. As a result, even when the awakening effect cannot be determined based on the change state of the driver's hand temperature, the driver's hand temperature rises after the cool air blowing is finished according to the driver's arousal level. Based on the degree, it can be appropriately determined whether or not the awakening effect on the driver is obtained.
　また、上述した実施形態では、顔画像撮像カメラ１０５で撮像した運転者の画像データに基づいて、運転者の覚醒度を検出する構成を例示したが、この構成に限定されるものではなく、たとえば、図示しない生体信号センサにより、運転者の脳波、心拍数、および皮膚電位などの運転者の生体信号の検出し、検出された運転中の運転者の脳波信号と、運転前の運転者の脳波信号とを比較することで、運転者の覚醒度を検出する構成としてもよい。また、図示しないブレーキセンサにより検出したブレーキペダルの踏み込み量を検出することで、運転者の覚醒度を検出する構成としてもよい。 In the above-described embodiment, the configuration in which the driver's arousal level is detected based on the driver's image data captured by the face image capturing camera 105 is illustrated. However, the present invention is not limited to this configuration. A driver's brain wave signal such as a driver's brain wave, heart rate, and skin potential is detected by a biological signal sensor (not shown), and the detected driver's brain wave signal during driving and the brain wave of the driver before driving are detected. It is good also as a structure which detects a driver | operator's arousal level by comparing with a signal. Moreover, it is good also as a structure which detects a driver | operator's arousal level by detecting the depression amount of the brake pedal detected by the brake sensor which is not shown in figure.
　さらに、上述した実施形態では、覚醒状態誘導装置１２０に備える吹き出し口から、運転者の覚醒度に応じた温度の風を送風する構成を例示したが、吹き出し口の構成は、特に限定されず、たとえば、運転者の覚醒状態を誘導するための吹き出し口を専用に設けてもよいし、あるいは、車室内の温度を調節するための吹き出し口を、運転者の覚醒度に応じた冷風を送風するための吹き出し口と兼用して用いてもよい。 Furthermore, in the above-described embodiment, the configuration in which the wind of the temperature according to the driver's arousal level is blown from the outlet provided in the arousal state guidance device 120 is illustrated, but the configuration of the outlet is not particularly limited, For example, a dedicated air outlet for inducing the driver's arousal state may be provided, or the air outlet for adjusting the temperature in the passenger compartment is blown with cool air according to the driver's arousal level. It may be used also as a blowout port for the purpose.
　なお、上述した実施形態の制御装置１１０は、本発明の覚醒度検出手段、温度変化検出手段、覚醒効果判定手段、および制御手段に、覚醒状態誘導装置１２０は、本発明の運転者状態誘導手段に、手部温度センサ１０６は、本発明の手部温度計測手段に、報知装置１３０は、本発明の報知手段にそれぞれ相当する。 Note that the control device 110 of the above-described embodiment is a wakefulness detection means, a temperature change detection means, a wakefulness effect determination means, and a control means of the present invention, and the wakefulness induction device 120 is a driver state guidance means of the present invention. The hand temperature sensor 106 corresponds to the hand temperature measuring means of the present invention, and the notification device 130 corresponds to the notification means of the present invention.
　１０１…操舵角センサ
　１０２…車速センサ
　１０３…アクセル開度センサ
　１０４…加速度センサ
　１０５…顔画像撮像カメラ
　１０６…手部温度センサ
　１１０…制御装置
　１２０…覚醒状態誘導装置
　１３０…報知装置 DESCRIPTION OF SYMBOLS 101 ... Steering angle sensor 102 ... Vehicle speed sensor 103 ... Accelerator opening degree sensor 104 ... Acceleration sensor 105 ... Face image pick-up camera 106 ... Hand part temperature sensor 110 ... Control apparatus 120 ... Arousal state induction apparatus 130 ... Notification apparatus

Claims (8)

  1. 　運転者の覚醒度を検出する覚醒度検出手段と、
    　前記運転者の覚醒度が所定値以下である場合に、運転者の手部に対して、前記運転者の覚醒度に応じた冷風を送風する運転者状態誘導手段と、
    　運転者の手部温度を計測する手部温度計測手段と、
    　前記手部温度計測手段の計測結果に基づいて、前記手部温度の変化状態を検出する温度変化検出手段と、
    　前記覚醒度に応じた冷風を運転者の手部に対して送風している際の前記手部温度の変化状態に基づいて、前記覚醒度に応じた冷風の送風による、運転者に対する覚醒効果が得られたか否かを判定する覚醒効果判定手段と、
    　前記覚醒効果が得られていないと判定された場合に、前記運転者状態誘導手段に、前記運転者の覚醒度に応じた冷風の送風を中止させる制御手段と、を備えることを特徴とする運転支援装置。     Wakefulness detection means for detecting the driver's wakefulness,
    When the driver's arousal level is equal to or lower than a predetermined value, a driver state guidance unit that blows cool air corresponding to the driver's arousal level to the driver's hand,
    A hand temperature measuring means for measuring a driver's hand temperature;
    Based on the measurement result of the hand temperature measuring means, a temperature change detecting means for detecting a change state of the hand temperature,
    Based on the change state of the hand temperature when the cool air according to the awakening degree is blown to the driver's hand, the awakening effect on the driver by the blowing of the cool air according to the awakening degree is Awakening effect determination means for determining whether or not it has been obtained;
    A driving unit comprising: a control unit that causes the driver state guidance unit to stop blowing cool air according to the driver's arousal level when it is determined that the awakening effect is not obtained. Support device.
  2. 　請求項１に記載の運転支援装置であって、
    　運転者に対して警告を報知する報知手段をさらに備え、
    　前記制御手段は、前記覚醒効果が得られていないと判定された場合に、前記運転者状態誘導手段に前記運転者の覚醒度に応じた冷風の送風を中止させるとともに、前記報知手段に運転者に対して警告を報知させることを特徴とする運転支援装置。     The driving support device according to claim 1,
    It further comprises notification means for notifying the driver of a warning,
    When it is determined that the awakening effect is not obtained, the control means causes the driver state guiding means to stop blowing cool air according to the driver's arousal level, and causes the notification means to A driving assistance device characterized by causing a warning to be issued.
  3. 　請求項１または２に記載の運転支援装置であって、
    　前記覚醒効果判定手段は、前記覚醒度に応じた冷風を運転者の手部に対して送風している際に、前記手部温度が、所定時間以上継続して低下し続けている場合には、前記覚醒効果が得られていないと判定することを特徴とする運転支援装置。     The driving support device according to claim 1 or 2,
    When the awakening effect determining means is blowing cold air corresponding to the awakening degree to the driver's hand, the hand temperature is continuously decreasing for a predetermined time or more. It is determined that the awakening effect is not obtained.
  4. 　請求項１～３のいずれかに記載の運転支援装置であって、
    　前記覚醒効果判定手段は、前記覚醒度に応じた冷風を運転者の手部に対して送風している際に、前記手部温度が、第１変化率以上の変化率で低下した後に、所定時間以上継続して、前記第１変化率よりも小さい第２変化率以下の変化率で低下し続けている場合に、前記覚醒効果が得られていないと判定することを特徴とする運転支援装置。     The driving support device according to any one of claims 1 to 3,
    The awakening effect determination means is configured to perform predetermined processing after the hand temperature is decreased at a change rate equal to or higher than the first change rate when the cool air corresponding to the awakening degree is blown to the driver's hand. A driving support device that determines that the awakening effect is not obtained when the rate of change continues to be longer than the time and continues to decrease at a rate of change equal to or less than a second rate of change smaller than the first rate of change. .
  5. 　請求項１～４のいずれかに記載の運転支援装置であって、
    　前記温度変化検出手段は、前記手部温度計測手段により計測された前記手部温度の時系列データに基づいて、前記手部温度の移動平均値を算出し、算出した前記手部温度の移動平均値に基づいて、前記手部温度の変化状態を検出することを特徴とする運転支援装置。     The driving support device according to any one of claims 1 to 4,
    The temperature change detecting means calculates a moving average value of the hand temperature based on the time series data of the hand temperature measured by the hand temperature measuring means, and calculates the moving average of the calculated hand temperature. A driving support device that detects a change state of the hand temperature based on a value.
  6. 　請求項１～５のいずれかに記載の運転支援装置であって、
    　前記温度変化検出手段は、前記手部温度計測手段により計測された前記手部温度の時系列データに基づいて、前記手部温度の移動平均値を算出し、算出した前記手部温度の移動平均値の時間微分値に基づいて、前記手部温度の変化状態を検出することを特徴とする運転支援装置。     The driving support device according to any one of claims 1 to 5,
    The temperature change detecting means calculates a moving average value of the hand temperature based on the time series data of the hand temperature measured by the hand temperature measuring means, and calculates the moving average of the calculated hand temperature. A driving support device that detects a change state of the hand temperature based on a time differential value of the value.
  7. 　請求項１～６のいずれかに記載の運転支援装置であって、
    　前記覚醒効果判定手段は、前記覚醒度に応じた冷風の送風が終了した後の前記手部温度の上昇度合いに基づいて、前記覚醒効果が得られたか否かを判定することを特徴とする運転支援装置。     The driving support device according to any one of claims 1 to 6,
    The awakening effect determination means determines whether or not the awakening effect has been obtained based on the degree of increase in the hand temperature after the cool air blowing according to the awakening degree is finished. Support device.
  8. 　運転者の覚醒度が所定値以下である場合に、運転者の手部に対して、前記運転者の覚醒度に応じた冷風を送風する運転支援方法であって、
    　前記覚醒度に応じた冷風を運転者の手部に対して送風している際の運転者の手部温度の変化状態に基づいて、前記覚醒度に応じた冷風の送風による、運転者に対する覚醒効果が得られたか否かを判定し、前記覚醒効果が得られていないと判定された場合に、前記覚醒度に応じた冷風の送風を中止することを特徴とする運転支援方法。     When the driver's arousal level is less than or equal to a predetermined value, a driving support method for blowing cool air according to the driver's arousal level to the driver's hand,
    Based on the change state of the hand temperature of the driver when the cool air corresponding to the arousal level is being blown to the driver's hand, the awakening to the driver by the blowing of the cool air corresponding to the awakening level It is determined whether or not an effect has been obtained, and when it is determined that the awakening effect has not been obtained, the driving support method is characterized in that the blowing of cold air corresponding to the arousal level is stopped.
PCT/JP2012/065965 2011-07-04 2012-06-22 Driving assistance device and driving assistance method WO2013005580A1 (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH068746A (en) * 1992-06-25 1994-01-18 Isuzu Motors Ltd Dose drive preventing device
JP2004050888A (en) * 2002-07-17 2004-02-19 Mitsuba Corp Drowsiness awaking device
JP2008102777A (en) * 2006-10-19 2008-05-01 Toyota Central R&D Labs Inc Driver information presentation apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH068746A (en) * 1992-06-25 1994-01-18 Isuzu Motors Ltd Dose drive preventing device
JP2004050888A (en) * 2002-07-17 2004-02-19 Mitsuba Corp Drowsiness awaking device
JP2008102777A (en) * 2006-10-19 2008-05-01 Toyota Central R&D Labs Inc Driver information presentation apparatus

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