WO2014054238A1 - Driving assistance device, and driving assistance method - Google Patents

Driving assistance device, and driving assistance method Download PDF

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Publication number
WO2014054238A1
WO2014054238A1 PCT/JP2013/005600 JP2013005600W WO2014054238A1 WO 2014054238 A1 WO2014054238 A1 WO 2014054238A1 JP 2013005600 W JP2013005600 W JP 2013005600W WO 2014054238 A1 WO2014054238 A1 WO 2014054238A1
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WIPO (PCT)
Prior art keywords
driver
break
map information
candidate site
route
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PCT/JP2013/005600
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French (fr)
Japanese (ja)
Inventor
宗作 重村
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株式会社デンソー
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Publication of WO2014054238A1 publication Critical patent/WO2014054238A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/34—Route searching; Route guidance
    • G01C21/36—Input/output arrangements for on-board computers
    • G01C21/3679—Retrieval, searching and output of POI information, e.g. hotels, restaurants, shops, filling stations, parking facilities
    • G01C21/3682—Retrieval, searching and output of POI information, e.g. hotels, restaurants, shops, filling stations, parking facilities output of POI information on a road map
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/34—Route searching; Route guidance
    • G01C21/36—Input/output arrangements for on-board computers
    • G01C21/3697—Output of additional, non-guidance related information, e.g. low fuel level
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/09626—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages where the origin of the information is within the own vehicle, e.g. a local storage device, digital map
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/16—Anti-collision systems

Definitions

  • the present disclosure relates to a driving support device and a driving support method for detecting driving a vehicle driver's arousal level and providing driving support.
  • Patent Document 1 proposes a technology that monitors the driver's arousal level and outputs a sound to alert the driver when the awakening level decreases to a certain level, or blows cool air to the driver to suppress the decrease in the awakening level.
  • Patent Document 2 a technique has been proposed that makes it possible to accurately detect the degree of arousal without being affected by individual differences among drivers or how the light strikes.
  • Patent Document 2 a driver's face image is taken and a plurality of feature quantities relating to the eyes are extracted, so that not only the driver's arousal level is determined but also information on the reliability of the awakening level is obtained. Can do.
  • JP 2008-186263 A Japanese Patent No. 4582137
  • the present disclosure has been made in view of the above points, and provides a driving support device and a driving support method capable of sufficiently suppressing the risk of encountering a traffic accident when the driver's arousal level is reduced.
  • the purpose is to provide.
  • a driving support device that performs driving support by presenting map information of a surrounding area including a current position to a driver of a vehicle according to the first aspect of the present disclosure includes a storage unit, a current position detection unit, a presentation unit, and an awakening A degree detection unit is provided.
  • the storage unit stores the map information.
  • the current position detection unit detects a current position of the vehicle.
  • the presenting unit reads out the map information of the surrounding area including the current position from the storage unit and presents it to the driver.
  • relates with the said map information, and memorize
  • a driving support method for providing driving assistance by presenting map information of a surrounding area including a current position to a driver of a vehicle stores the map information and stops the vehicle.
  • a candidate for a break that is a place where a break is possible is stored in association with the map information, the current position of the vehicle is detected, the map information of the surrounding area including the current position is read, and the driver And detecting the degree of arousal of the driver.
  • the candidate for a break associated with the map information is also presented to the driver. .
  • FIG. 1 is an explanatory diagram of a vehicle equipped with a driving support apparatus according to an embodiment of the present disclosure.
  • FIG. 2 is a block diagram of the driving support device of the embodiment
  • FIG. 3 is a flowchart of the driving support process executed by the driving support device of the embodiment.
  • FIG. 4 is a flowchart of the first half of the break candidate site presentation process of the first embodiment performed in the driving support process.
  • FIG. 5 is a flowchart of the latter half of the break candidate site presentation process of the first embodiment.
  • FIG. 6 is an explanatory diagram illustrating the movable distance set in accordance with the sleepiness level.
  • FIG. 7 is an explanatory diagram illustrating the result of searching for a break candidate site existing within the search range
  • FIG. 8 is an explanatory diagram illustrating a screen for confirming to the driver whether or not guidance to the nearest break candidate site can be started.
  • FIG. 9 is an explanatory diagram illustrating a state where guidance to the nearest break candidate site is started
  • FIG. 10 is an explanatory view illustrating a screen for confirming to the driver whether or not the display range may be widened so that the nearest break candidate site is included
  • FIG. 11 is an explanatory view exemplifying a state where the candidate break location closest to the current position is displayed on the screen.
  • FIG. 12 is an explanatory diagram illustrating a screen that prompts the user to stop driving and take a break.
  • FIG. 12 is an explanatory diagram illustrating a screen that prompts the user to stop driving and take a break.
  • FIG. 13 is a flowchart of the first half of the break candidate site presentation process of the second embodiment
  • FIG. 14 is a flowchart of the latter half of the candidate break site presentation process of the second embodiment.
  • FIG. 15 is an explanatory diagram illustrating the movable distance and the off-route allowable distance set according to sleepiness.
  • FIG. 16A to FIG. 16C are explanatory diagrams showing a state in which the search range for the break candidate site is determined based on the movable distance and the off-route allowable distance.
  • FIG. 17 (a) to FIG. 17 (c) are explanatory views illustrating a search range for a break candidate site determined based on the movable distance and the off-route allowable distance, FIG.
  • FIG. 18 is an explanatory diagram illustrating a case where a break candidate site is found on the route.
  • FIG. 19 is an explanatory diagram illustrating a state in which the display range is changed so that a break candidate site on the route is displayed.
  • FIG. 20 is an explanatory diagram illustrating a case where a break candidate site is found at a position off the route.
  • FIG. 21A and FIG. 21B are explanatory diagrams illustrating a state in which the display range is changed so that the nearest break candidate site off the route is displayed.
  • FIG. 1 shows a rough configuration of a vehicle 1 equipped with the driving support device 10 of the present embodiment.
  • the driving support device 10 of this embodiment includes a driver camera (CAMERA) 12 that is mounted on the dashboard (or steering column) of the vehicle 1 and captures an image of the driver's face from the front.
  • a touch panel display (DISPLAY) 14 for displaying map information and the like to a person, and a control device 100 connected thereto.
  • CAMERA driver camera
  • DISPLAY touch panel display
  • FIG. 2 shows an internal configuration of the control device 100 included in the driving support device 10 of the present embodiment.
  • the control device 100 includes a drowsiness level detection unit (DR DEG DETC) 110 that detects a drowsiness level as an index indicating the driver's arousal level, and a current position detection unit (POSI) that detects the current position of the vehicle 1.
  • DETC drowsiness level detection unit
  • POSI current position detection unit
  • DETC 120
  • storage unit 124 that stores map information (MAP INFO), and the like
  • CONTROL control unit
  • the sleepiness level detection unit 110 acquires an image of the driver's face from the driver camera 12 and analyzes the frequency with which the line of sight moves, the blink cycle, or the movement speed of the eyelid when blinking. To detect sleepiness.
  • the current position detection unit 120 detects the current position of the vehicle 1 by detecting signals from a plurality of GPS satellites (not shown).
  • the control unit 122 receives information on the current position of the vehicle 1 from the current position detection unit 120, the control unit 122 reads out map information of the surrounding area including the current position from the storage unit 124 and displays it on the screen of the display 14.
  • the control unit 122 also has a car navigation function. When the driver sets a destination, the route to the destination is extracted by searching the map information and displayed on the screen of the display 14. Is also possible.
  • the storage unit 124 can be realized by an external storage medium such as a hard disk or a memory.
  • the sleepiness level detection unit 110 and the control unit 122 can be realized by a microcomputer including a CPU, a ROM, a RAM, and the like.
  • the storage unit 124 of the control device 100 of this embodiment also stores break candidate site information (REST PLACE INFO).
  • the break candidate site is a place (a public facility such as a park or a store) where the driver can rest by stopping the vehicle.
  • the break candidate site information is information indicating the locations of a plurality of break candidate sites. That is, the break candidate site is associated with the map information by the break candidate site information indicating the location of the break candidate site.
  • the break candidate site information may be any information as long as it is information that can associate the break candidate site with the map information.
  • break candidate site information accompanying information (for example, whether there is a toilet, whether fueling or eating is possible) can be stored.
  • break candidate site information is also stored as voice data.
  • control apparatus 100 of a present Example performs a driving assistance process using such a break candidate site information, Even if a driver
  • the drowsiness level detection unit 110 corresponds to the “wakefulness level detection unit”
  • the control unit 122 corresponds to the “presentation unit” in the present disclosure.
  • FIG. 3 shows a flowchart of the driving support process executed by the driving support device 10 of the present embodiment in order to avoid the danger that the driver encounters a traffic accident.
  • the driving support process of the present embodiment realizes a car navigation function by displaying map information on the screen of the display 14 while the driver does not feel sleepy. That is, first, the current position of the vehicle 1 is acquired using the current position detecting unit 120 (S100), and then the display range setting on the display 14 is acquired (S102). The display range is preset in the control unit 122 by the driver.
  • the control unit 122 corresponds to the “route detection unit” in the present disclosure.
  • the car navigation function is assumed to be activated in advance by the driver. However, if the drowsiness level detection unit 110 detects that the driver feels sleepy, the control unit 122 performs the car navigation function.
  • the function may be activated to start the driving support process of the present embodiment, and the break candidate place presentation process may be executed from the driving support process.
  • FIG. 4 and FIG. 5 show a flowchart of the break candidate site presentation process of the first embodiment.
  • a movable distance corresponding to the driver's sleepiness is acquired (S202).
  • the movable distance is stored in advance in a ROM (not shown) of the control unit 122.
  • FIG. 6 illustrates the movable distance set according to the sleepiness level.
  • the movable distance is set so as to decrease as the sleepiness level increases (the sleepiness felt by the driver increases).
  • the movable distance decreases as the drowsiness level increases.
  • the movable distance maintains the same value. good.
  • a break candidate site is searched for using a range within a movable distance centered on the current position as a search range (S204).
  • the storage unit 124 stores a plurality of break candidate sites as break candidate site information, and each break candidate site is associated with map information. Therefore, a break candidate site is searched by extracting those associated with the search range from the break candidate sites.
  • control unit 122 performs a process of setting a movable distance centered on the current position as a search range and searching for a break candidate site within the search range. Therefore, in the present embodiment, the control unit 122 discloses the present disclosure. Corresponds to “setting unit” and “search unit”.
  • FIG. 7 illustrates a state where a plurality of break candidate sites are detected within the search range. In the example shown in the figure, five rest candidate sites from candidate site a to candidate site e are detected.
  • FIG. 7 illustrates a state in which a proposal for guiding to the nearest break candidate site is displayed on the screen of the display 14.
  • FIG. 9 illustrates a state in which the route (route) to the break candidate site is displayed with a thick broken line on the screen of the display 14 with the start of guidance.
  • the nearest break candidate site is within the display range on the screen of the display 14 (S214 in FIG. 5).
  • the rest candidate site is searched for within the range of the movable distance determined according to the sleepiness level, while the range (display range) where the map information is displayed on the display 14 is set by the driver. Therefore, the found break candidate site is not necessarily within the display range on the display 14. Therefore, it is determined whether or not the nearest break candidate site is within the display range of the display 14 (S214), and if it is not within the display range (S214: no), a proposal to change the display range is made. It is displayed on the screen of the display 14 (S220).
  • FIG. 10 illustrates a state in which a proposal for changing the display range is displayed on the screen of the display 14.
  • the button displayed as “Yes” on the screen of the display 14 illustrated in FIG. 10 it is determined that the driver's approval has been obtained (S ⁇ b> 222: yes), and the nearest break candidate site is After changing the display range of the map information so as to fit (S224), the break candidate site is displayed at the corresponding position of the map information (S216).
  • FIG. 11 exemplifies a state in which the candidate break location closest to the current position is displayed on the screen of the display 14.
  • the rectangle shown with the thin broken line in the figure represents the display range before changing.
  • control part 122 since the control part 122 is performing the process which confirms with a driver
  • the break candidate site is displayed without changing the display range (S216).
  • a predetermined number for example, five
  • the voice data of the found break candidate site information is read out (S218). Therefore, the driver can know what break candidate sites have been found, including break candidate sites that are not displayed on the screen of the display 14. Further, even when the driver does not approve the change of the display range (S222: no), the information about the break candidate site can be known. Here, the audio data of all the break candidate sites found is read out, but the audio data may be read out only for the break candidate sites displayed on the screen of the display 14.
  • FIG. 12 shows an example of a screen displaying that the driver is suggested to take a break.
  • the rest candidate site is searched, and the found break candidate sites are illustrated in FIG. So that it is specifically presented as a resting place. That is, for example, even if the location of “park” is displayed for a driver whose judgment has deteriorated, the driver may not always recognize the location as a rest location. On the other hand, if it is presented as a resting place, even a driver whose judgment power has been reduced can be immediately recognized. For this reason, the driver does not continue to drive while looking for a resting place with a reduced judgment, and the danger of encountering a traffic accident can be avoided.
  • the break candidate site is searched for within the range of the movable distance corresponding to the driver's sleepiness level, and is set so that the movable distance decreases as the sleepiness level increases. For this reason, the driver who feels strong sleepiness does not move a long distance in order to take a break at the break candidate site. As a result, the danger of encountering a traffic accident can be more reliably avoided.
  • a break candidate place presentation process of the second embodiment that presents a break candidate place in consideration of the destination set by the driver will be described.
  • a candidate for a break within a movable distance centered on the current position is searched and presented to the driver regardless of the destination the driver is about to go to. did.
  • the candidate for a break may be searched in consideration of the destination set by the driver.
  • FIG. 13 and FIG. 14 are flowcharts of a break candidate location presentation process of the second embodiment in which a break candidate location is presented in consideration of the destination set by the driver. This process is executed instead of the above-described first break candidate site presentation process (S200) when the drowsiness is determined not to be “0” in the driving process shown in FIG. 3 (S106: no). Process.
  • the break candidate site presentation process (S300) of the second embodiment first, a movable distance corresponding to the driver's sleepiness is obtained (S302). Subsequently, in the break candidate site presentation process of the second embodiment, an off-route allowable distance is acquired (S304).
  • the off-route allowable distance is a value indicating how far a candidate for a break is searched from a route to the destination set by the driver.
  • the candidate for the break is presented.
  • the search is limited to the route, there may be a case where no break candidate site is found within the movable distance. Therefore, when searching for a break candidate site, it is set in advance how far the break candidate site is to be searched from a position that is out of the traveling route.
  • the off-route allowable distance is set in advance according to the driver's sleepiness and stored in advance in a ROM (not shown) of the control unit 122.
  • the route deviation allowable distance of the present embodiment corresponds to “displacement allowable distance” of the present disclosure. Therefore, the control unit 122 that stores the movable distance L and the off-route allowable distance La corresponds to a “distance storage unit” in the present disclosure.
  • FIG. 15 conceptually shows a state in which the movable distance L and the off-route allowable distance La set according to the sleepiness level are stored in the ROM (not shown) of the control unit 122.
  • the movable distance L is set so as to decrease as the sleepiness level increases (the sleepiness felt by the driver increases).
  • the off-route allowable distance La is set to increase as the sleepiness level increases.
  • the off-route allowable distance La does not become larger than the movable distance L.
  • the search range for the break candidate site is set as follows based on the movable distance L and the allowable distance La.
  • the movable distance L is large, but the off-route allowable distance La is set to a small value. For this reason, as shown in FIG. 16 (a), it is difficult to deviate from the route, but it is possible to search to a distant rest candidate site along the route.
  • the movable distance L is small, but the off-route allowable distance La is large to almost the same value as the movable distance L. For this reason, as shown in FIG. 16B, it is not possible to travel far along the route, but it is possible to search for a relatively far break candidate site off the route.
  • the sum of the moving distance L1 along the route and the moving distance L2 off the route cannot exceed the movable distance L. Accordingly, for example, when the sleepiness level is large, when the distance L1 is farther along the route than the state shown in FIG. 16B, the distance L2 that can be moved off the route is as shown in FIG. That is shorter than the state shown in FIG. 16B (see FIG. 16C).
  • FIG. 17 (a) to FIG. 17 (c) exemplify how the search range for the break candidate site is set in this way.
  • FIG. 17A shows the search range when the sleepiness level is low
  • FIG. 17B shows the case where the sleepiness level is medium.
  • the thick broken line shown in the figure is the route to the destination set by the driver.
  • the search range of the break candidate site is a range with a certain width on both sides centering on the route for a while toward the front of the host vehicle, and then along the route. The farther away, the smaller the width on both sides.
  • FIG. 17C shows a search range when the sleepiness level is very large.
  • the movable distance L and the off-route allowable distance La are substantially equal (see FIG. 15), and therefore the range of the substantially movable distance L around the current position of the host vehicle is the search range. Become.
  • FIGS. 17 (a) to 17 (c) it has been described that no candidate for a rest point is searched for in the direction of travel from the current position of the host vehicle. However, it is also possible to search for a break candidate site behind the traveling direction within the radius range of the off-route allowable distance La around the current position of the host vehicle.
  • a search range is set based on the movable distance L and the off-route allowable distance La according to the sleepiness level, and a break candidate site in the search range is searched.
  • a break candidate site is found within the search range and on the route (S308). For example, as illustrated in FIG. 18, it is assumed that two rest candidate sites, candidate site a and candidate site b, are found on the route within the search range. In this case, it is determined as “yes” in S308 of FIG. 13, and subsequently, it is determined whether or not the nearest candidate break site found (candidate site a in the example of FIG. 18) is within the display range of the display 14. (S318 in FIG. 14).
  • FIG. 19 illustrates a state where a break candidate site is displayed on the route.
  • a predetermined number for example, five
  • the driver presses the button labeled “Yes” on the screen of the display 14, it is determined that the driver's approval has been obtained (S314: yes), and the driver makes a detour to the nearest break candidate site.
  • the route for guidance is changed (S316). In the example shown in FIG. 20, there are two break candidate sites (candidate site c and candidate site d) in the search range off the route. The route of guidance is changed so as to detour. Further, the display of the route on the screen of the display 14 is also changed in accordance with the change of the guidance route.
  • the nearest break candidate site (candidate site c here) is within the display range of the display 14 (S318 in FIG. 14), and if it is within the display range (S318: yes), the display A break candidate site is presented at a corresponding position within the range (S320).
  • the driver approves the route guidance to the nearest break candidate site (S314: yes in FIG. 13) and the route has been changed to detour to the break candidate site (S316)
  • As exemplified in 21 (a) a state where a break candidate site within the search range deviating from the route and a route detouring to the break candidate site are displayed on the screen of the display 14 is exemplified.
  • the driver does not feel much need for a break, so even if a candidate break place that is off the route is presented, it may be ignored by the driver.
  • you present a potential rest area that does not deviate too much from the route you can naturally take the driver to the rest area and have them rest, thus reducing the risk that the driver will encounter a traffic accident. It becomes possible to do.
  • the break candidate site may be presented in a more conspicuous manner (for example, blinking manner) as the driver's sleepiness increases. In this way, even when the driver feels drowsy and the driver's judgment is reduced, the driver can be surely recognized that the break candidate site is presented.
  • a conspicuous manner for example, blinking manner
  • the search range of the break candidate site is changed according to the driver's sleepiness level.
  • the content presented as a break candidate site may be changed according to the sleepiness level.
  • an object that is not presented as a candidate for a break when the drowsiness is low such as a shoulder that is not prohibited from parking or stopping, may be presented as a candidate for a break when the drowsiness is high. In this way, when it becomes necessary to take a break as soon as possible due to increased sleepiness, it is possible to reliably present the nearest break candidate site to the driver.
  • a break candidate site may be searched for within a search range set based on the degree of arousal.
  • a search for a candidate for a break is made.
  • the range may be set as follows. First, a movable distance, which is a distance that can be moved from the current position, and an allowable deviation distance that is allowed to deviate from the route to the destination are stored according to the degree of arousal. And when the fall of a wakefulness level is detected, it is good also as reading the movable distance according to the wakefulness level, and the deviation
  • the driver feels a little resistance to heading to the break candidate site that is off the route to the destination. Therefore, when the decrease in the degree of arousal is small, there is a possibility that the driver may ignore a rest candidate site that deviates from the route to the destination. On the other hand, if the degree of arousal is large, the driver also feels the need for a break, so even if a candidate break place that is off the route to the destination is presented, it may be ignored by the driver There are few. From this, it is possible to search for suitable rest candidate sites and present them to the driver if the search range of the rest candidate sites is set based on the movable distance and the allowable deviation distance set according to the awakening degree. It becomes.
  • the following may be performed. First, it is determined whether or not the break candidate site searched from the search range exists in the surrounding area being presented to the driver. Then, if the searched break candidate site does not exist in the surrounding area being presented, the driver is inquired whether or not to change the range of the surrounding area to be presented. As a result, when the driver's approval is obtained, the map information of the surrounding area including at least one searched break candidate site may be read and presented to the driver together with the break candidate site.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Navigation (AREA)
  • Instructional Devices (AREA)
  • Traffic Control Systems (AREA)

Abstract

A driving assistance device which performs driving assistance by presenting map information of a surrounding area that includes the present position with respect to the driver of a vehicle is provided with a storage unit (124) which stores the map information, a current position detection unit (120) which detects the current position of the vehicle, a presentation unit (122) which reads out the map information for the surrounding area including the present position and presents the same to the driver, and an alertness degree detection unit (110) which detects the alertness degree of the driver. The storage unit (124) stores a rest candidate stop, which is a location at which it is possible to stop the vehicle and rest, in association with the map information. The presentation unit (122), if the alertness degree detection unit (110) has detected lowering of the alertness degree, also presents to the driver, in addition to the map information, the rest candidate stop that has been associated with the map information.

Description

運転支援装置、および運転支援方法Driving support device and driving support method 関連出願の相互参照Cross-reference of related applications
　本開示は、２０１２年１０月４日に出願された日本出願番号２０１２－２２２５８４号に基づくもので、ここにその記載内容を援用する。 This disclosure is based on Japanese Patent Application No. 2012-222584 filed on October 4, 2012, the contents of which are incorporated herein by reference.
　本開示は、車両の運転者の覚醒度合いを検出して運転支援を行う運転支援装置、および運転支援方法に関する。 The present disclosure relates to a driving support device and a driving support method for detecting driving a vehicle driver's arousal level and providing driving support.
　車両を長時間に亘って運転したり、夜間に運転したり、体調が不十分な状態で運転していると、次第に運転者の覚醒度合いが低下するため交通事故に遭遇する危険性が高くなる。そこで、運転者の覚醒度合いを監視しておき、覚醒度合いが一定程度まで低下すると音声を出力して運転者に警告し、あるいは運転者に冷気を吹きかけて覚醒度合いの低下を抑制しようとする技術が提案されている（特許文献１）。 Driving a vehicle for a long time, driving at night, or driving in poor physical condition gradually increases the risk of encountering a traffic accident because the driver's awakening level gradually decreases. . Therefore, a technology that monitors the driver's arousal level and outputs a sound to alert the driver when the awakening level decreases to a certain level, or blows cool air to the driver to suppress the decrease in the awakening level. Has been proposed (Patent Document 1).
　また、運転者の個人差や光の当たり方などの影響を受けることなく、覚醒度合いを正確に検出可能とする技術も提案されている（特許文献２）。この提案の技術では、運転者の顔の画像を撮影して目に関する複数の特徴量を抽出することで、運転者の覚醒度合いを決定するだけでなく、覚醒度合いの信頼度に関する情報も得ることができる。 In addition, a technique has been proposed that makes it possible to accurately detect the degree of arousal without being affected by individual differences among drivers or how the light strikes (Patent Document 2). In this proposed technique, a driver's face image is taken and a plurality of feature quantities relating to the eyes are extracted, so that not only the driver's arousal level is determined but also information on the reliability of the awakening level is obtained. Can do.
　しかし、覚醒度合いの低下を検出して、運転者に警告したり冷気を吹きかけたりしても、交通事故に遭遇する危険性を十分に抑制することはできない虞があった。これは、覚醒度合いが低下した状態の運転者は、通常の状態よりも判断力が低下しているため、警告されたり冷気を吹きかけられたりしても、そのまま運転を継続してしまう可能性があるためである。 However, there is a possibility that the risk of encountering a traffic accident cannot be sufficiently suppressed even if the driver is warned or cold air is detected by detecting a decrease in the degree of arousal. This is because a driver who is in a state of reduced arousal has a lower judgment than in a normal state, so there is a possibility that the driver may continue driving even if a warning or cold air is blown. Because there is.
特開２００８－１８６２６３号公報JP 2008-186263 A 特許第４５８２１３７号公報Japanese Patent No. 4582137
　本開示は、上記点に鑑みてなされたものであり、運転者の覚醒度合いが低下した場合に、交通事故に遭遇する危険性を十分に抑制することが可能な運転支援装置及び運転支援方法を提供することを目的とする。 The present disclosure has been made in view of the above points, and provides a driving support device and a driving support method capable of sufficiently suppressing the risk of encountering a traffic accident when the driver's arousal level is reduced. The purpose is to provide.
　本開示の第１態様による車両の運転者に対して現在位置を含んだ周辺地域の地図情報を提示することによって運転支援を行う運転支援装置は、記憶部、現在位置検出部、提示部と覚醒度合い検出部を備える。前記記憶部は、前記地図情報を記憶しておく。前記現在位置検出部は、前記車両の現在位置を検出する。前記提示部は、前記現在位置を含んだ前記周辺地域の前記地図情報を前記記憶部から読み出して、前記運転者に提示する。前記覚醒度合い検出部は、前記運転者の覚醒度合いを検出する。前記記憶部は、前記車両を停車させて休憩可能な場所である休憩候補地を、前記地図情報に関連付けて記憶する。前記提示部は、前記覚醒度合い検出部が前記覚醒度合いの低下を検出した場合には、前記地図情報に加えて、該地図情報に関連付けられた前記休憩候補地も前記運転者に提示する。 A driving support device that performs driving support by presenting map information of a surrounding area including a current position to a driver of a vehicle according to the first aspect of the present disclosure includes a storage unit, a current position detection unit, a presentation unit, and an awakening A degree detection unit is provided. The storage unit stores the map information. The current position detection unit detects a current position of the vehicle. The presenting unit reads out the map information of the surrounding area including the current position from the storage unit and presents it to the driver. The awakening degree detection unit detects the awakening degree of the driver. The said memory | storage part links | relates with the said map information, and memorize | stores the break candidate site which is a place where the said vehicle can stop and can rest. In the case where the arousal level detection unit detects a decrease in the awakening level, the presenting unit presents the rest candidate site associated with the map information to the driver in addition to the map information.
　上記装置によると、運転者の覚醒度合いが低下した場合に、交通事故に遭遇する危険性を十分に抑制することが可能である。 According to the above device, it is possible to sufficiently suppress the risk of encountering a traffic accident when the driver's arousal level decreases.
　本開示の第２態様による車両の運転者に対して現在位置を含んだ周辺地域の地図情報を提示することによって運転支援を行う運転支援方法は、前記地図情報を記憶し、前記車両を停車させて休憩可能な場所である休憩候補地を、前記地図情報に関連付けて記憶し、前記車両の現在位置を検出し、前記現在位置を含んだ前記周辺地域の前記地図情報を読み出して、前記運転者に提示し、前記運転者の覚醒度合いを検出することを備える。前記地図情報の前記運転者への提示において、前記覚醒度合いの低下が検出された場合には、前記地図情報に加えて、該地図情報に関連付けられた前記休憩候補地も前記運転者に提示する。 A driving support method for providing driving assistance by presenting map information of a surrounding area including a current position to a driver of a vehicle according to a second aspect of the present disclosure stores the map information and stops the vehicle. A candidate for a break that is a place where a break is possible is stored in association with the map information, the current position of the vehicle is detected, the map information of the surrounding area including the current position is read, and the driver And detecting the degree of arousal of the driver. In the presentation of the map information to the driver, when a decrease in the degree of arousal is detected, in addition to the map information, the candidate for a break associated with the map information is also presented to the driver. .
　上記方法によると、運転者の覚醒度合いが低下した場合に、交通事故に遭遇する危険性を十分に抑制することが可能である。 According to the above method, it is possible to sufficiently suppress the risk of encountering a traffic accident when the driver's arousal level decreases.
　本開示についての上記目的およびその他の目的、特徴や利点は、添付の図面を参照しながら下記の詳細な記述により、より明確になる。その図面は、
図１は、本開示の一実施例の運転支援装置を搭載した車両の説明図であり、 図２は、実施例の運転支援装置のブロック図であり、 図３は、実施例の運転支援装置が実行する運転支援処理のフローチャートであり、 図４は、運転支援処理の中で行われる第１実施例の休憩候補地提示処理の前半部分のフローチャートであり、 図５は、第１実施例の休憩候補地提示処理の後半部分のフローチャートであり、 図６は、眠気度に応じて設定された移動可能距離を例示した説明図であり、 図７は、探索範囲内に存在する休憩候補地を探索した結果を例示した説明図であり、 図８は、最寄りの休憩候補地への案内を開始して良いかを運転者に確認する画面を例示した説明図であり、 図９は、最寄りの休憩候補地への案内を開始した様子を例示した説明図であり、 図１０は、最寄りの休憩候補地が含まれるように表示範囲を広くして良いか否かを運転者に確認する画面を例示した説明図であり、 図１１は、現在位置から最も近い休憩候補地が画面上に表示された様子を例示した説明図であり、 図１２は、運転を中止して休憩するように促す画面を例示した説明図であり、 図１３は、第２実施例の休憩候補地提示処理の前半部分のフローチャートであり、 図１４は、第２実施例の休憩候補地提示処理の後半部分のフローチャートであり、 図１５は、眠気度に応じて設定された移動可能距離およびルート外れ許容距離を例示した説明図であり、 図１６（ａ）から図１６（ｃ）は、移動可能距離およびルート外れ許容距離に基づいて休憩候補地の探索範囲が決定される様子を示す説明図であり、 図１７（ａ）から図１７（ｃ）は、移動可能距離およびルート外れ許容距離に基づいて決定された休憩候補地の探索範囲を例示した説明図であり、 図１８は、ルート上で休憩候補地が見つかった場合を例示した説明図であり、 図１９は、ルート上の休憩候補地が表示されるように表示範囲を変更した様子を例示した説明図であり、 図２０は、ルートから外れた位置に休憩候補地が見つかった場合を例示した説明図であり、 図２１（ａ）と図２１（ｂ）は、ルートから外れた最も近い位置の休憩候補地が表示されるように表示範囲を変更した様子を例示した説明図である。 The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
FIG. 1 is an explanatory diagram of a vehicle equipped with a driving support apparatus according to an embodiment of the present disclosure. FIG. 2 is a block diagram of the driving support device of the embodiment, FIG. 3 is a flowchart of the driving support process executed by the driving support device of the embodiment. FIG. 4 is a flowchart of the first half of the break candidate site presentation process of the first embodiment performed in the driving support process. FIG. 5 is a flowchart of the latter half of the break candidate site presentation process of the first embodiment. FIG. 6 is an explanatory diagram illustrating the movable distance set in accordance with the sleepiness level. FIG. 7 is an explanatory diagram illustrating the result of searching for a break candidate site existing within the search range, FIG. 8 is an explanatory diagram illustrating a screen for confirming to the driver whether or not guidance to the nearest break candidate site can be started. FIG. 9 is an explanatory diagram illustrating a state where guidance to the nearest break candidate site is started, FIG. 10 is an explanatory view illustrating a screen for confirming to the driver whether or not the display range may be widened so that the nearest break candidate site is included, FIG. 11 is an explanatory view exemplifying a state where the candidate break location closest to the current position is displayed on the screen. FIG. 12 is an explanatory diagram illustrating a screen that prompts the user to stop driving and take a break. FIG. 13 is a flowchart of the first half of the break candidate site presentation process of the second embodiment, FIG. 14 is a flowchart of the latter half of the candidate break site presentation process of the second embodiment. FIG. 15 is an explanatory diagram illustrating the movable distance and the off-route allowable distance set according to sleepiness. FIG. 16A to FIG. 16C are explanatory diagrams showing a state in which the search range for the break candidate site is determined based on the movable distance and the off-route allowable distance. FIG. 17 (a) to FIG. 17 (c) are explanatory views illustrating a search range for a break candidate site determined based on the movable distance and the off-route allowable distance, FIG. 18 is an explanatory diagram illustrating a case where a break candidate site is found on the route. FIG. 19 is an explanatory diagram illustrating a state in which the display range is changed so that a break candidate site on the route is displayed. FIG. 20 is an explanatory diagram illustrating a case where a break candidate site is found at a position off the route. FIG. 21A and FIG. 21B are explanatory diagrams illustrating a state in which the display range is changed so that the nearest break candidate site off the route is displayed.
　以下では、上述した本開示の内容を明確にするために実施例について説明する。
（第1実施例）
　図１には、本実施例の運転支援装置１０を搭載した車両１の大まかな構成が示されている。図示されているように本実施例の運転支援装置１０は、車両１のダッシュボード（あるいはステアリングコラム）に搭載されて前方から運転者の顔の画像を撮影するドライバーカメラ（ＣＡＭＥＲＡ）１２と、運転者に対して地図情報などを表示するタッチパネル式のディスプレイ（ＤＩＳＰＬＡＹ）１４と、これらに接続された制御装置１００などを備えている。 Hereinafter, examples will be described in order to clarify the contents of the present disclosure described above.
(First Example)
FIG. 1 shows a rough configuration of a vehicle 1 equipped with the driving support device 10 of the present embodiment. As shown in the figure, the driving support device 10 of this embodiment includes a driver camera (CAMERA) 12 that is mounted on the dashboard (or steering column) of the vehicle 1 and captures an image of the driver's face from the front. A touch panel display (DISPLAY) 14 for displaying map information and the like to a person, and a control device 100 connected thereto.
　図２には、本実施例の運転支援装置１０が備える制御装置１００の内部構成が示されている。図示されるように制御装置１００は、運転者の覚醒度合いを示す指標として眠気度を検出する眠気度検出部（ＤＲ　ＤＥＧ　ＤＥＴＣ）１１０と、車両１の現在位置を検出する現在位置検出部（ＰＯＳＩ　ＤＥＴＣ）１２０と、地図情報（ＭＡＰ　ＩＮＦＯ）などを記憶している記憶部１２４と、制御装置１００の全体の動作を制御する制御部（ＣＯＮＴＲＯＬ）１２２を備えている。 FIG. 2 shows an internal configuration of the control device 100 included in the driving support device 10 of the present embodiment. As shown in the figure, the control device 100 includes a drowsiness level detection unit (DR DEG DETC) 110 that detects a drowsiness level as an index indicating the driver's arousal level, and a current position detection unit (POSI) that detects the current position of the vehicle 1. DETC) 120, a storage unit 124 that stores map information (MAP INFO), and the like, and a control unit (CONTROL) 122 that controls the overall operation of the control device 100.
　このうちの眠気度検出部１１０は、ドライバーカメラ１２から運転者の顔の画像を取得して、視線が移動する頻度や、瞬きの周期、あるいは瞬きする際のまぶたの移動速度などを解析することによって眠気度を検出する。また、現在位置検出部１２０は、図示しない複数のＧＰＳ衛星からの信号を検出することによって車両１の現在位置を検出する。制御部１２２は、車両１の現在位置に関する情報を現在位置検出部１２０から受け取ると、現在位置を含んだ周辺地域の地図情報を記憶部１２４から読み出して、ディスプレイ１４の画面上に表示する。また、制御部１２２はカーナビゲーション機能も有しており、運転者が目的地を設定すると、地図情報を検索することによって目的地までの道順を抽出して、ディスプレイ１４の画面上に表示することも可能である。 Of these, the sleepiness level detection unit 110 acquires an image of the driver's face from the driver camera 12 and analyzes the frequency with which the line of sight moves, the blink cycle, or the movement speed of the eyelid when blinking. To detect sleepiness. Further, the current position detection unit 120 detects the current position of the vehicle 1 by detecting signals from a plurality of GPS satellites (not shown). When the control unit 122 receives information on the current position of the vehicle 1 from the current position detection unit 120, the control unit 122 reads out map information of the surrounding area including the current position from the storage unit 124 and displays it on the screen of the display 14. The control unit 122 also has a car navigation function. When the driver sets a destination, the route to the destination is extracted by searching the map information and displayed on the screen of the display 14. Is also possible.
　尚、記憶部１２４は、ハードディスクなどの外部記憶媒体や、メモリーなどによって実現することができる。また、眠気度検出部１１０や制御部１２２は、ＣＰＵやＲＯＭ、ＲＡＭなどを備えたマイクロコンピューターによって実現することができる。 The storage unit 124 can be realized by an external storage medium such as a hard disk or a memory. The sleepiness level detection unit 110 and the control unit 122 can be realized by a microcomputer including a CPU, a ROM, a RAM, and the like.
　本実施例の制御装置１００の記憶部１２４には、地図情報に加えて、休憩候補地情報（ＲＥＳＴ　ＰＬＡＣＥ　ＩＮＦＯ）も記憶されている。ここで休憩候補地とは、車両を停車させて運転者が休憩することが可能な場所（公園などの公共施設や、店舗など）である。また、休憩候補地情報とは、複数の休憩候補地の所在地を示す情報である。すなわち、休憩候補地は、その休憩候補地の所在地を示す休憩候補地情報によって地図情報に関連づけられている。尚、休憩候補地情報は、休憩候補地と地図情報とを関連付けることができる情報であれば、所在地に限らずどのような情報であっても構わない。 In addition to the map information, the storage unit 124 of the control device 100 of this embodiment also stores break candidate site information (REST PLACE INFO). Here, the break candidate site is a place (a public facility such as a park or a store) where the driver can rest by stopping the vehicle. Further, the break candidate site information is information indicating the locations of a plurality of break candidate sites. That is, the break candidate site is associated with the map information by the break candidate site information indicating the location of the break candidate site. Note that the break candidate site information may be any information as long as it is information that can associate the break candidate site with the map information.
　更に、休憩候補地情報には、それぞれの休憩候補地に関する付随情報（たとえば、トイレの有無、給油や食事の可否）も記憶しておくことができる。加えて、本実施例では休憩候補地情報が音声データとしても記憶されている。 Furthermore, in the break candidate site information, accompanying information (for example, whether there is a toilet, whether fueling or eating is possible) can be stored. In addition, in this embodiment, break candidate site information is also stored as voice data.
　そして本実施例の制御装置１００は、このような休憩候補地情報を利用して運転支援処理を実行することにより、たとえ運転者が眠気を感じて覚醒度合いが低下している場合でも、交通事故に遭遇する危険性を十分に抑制することが可能となる。 And the control apparatus 100 of a present Example performs a driving assistance process using such a break candidate site information, Even if a driver | operator feels sleepiness and the arousal level is falling, a traffic accident It is possible to sufficiently suppress the risk of encountering the above.
　尚、本実施例では、眠気度検出部１１０が「覚醒度合い検出部」に対応し、制御部１２２が本開示における「提示部」に対応する。 In this embodiment, the drowsiness level detection unit 110 corresponds to the “wakefulness level detection unit”, and the control unit 122 corresponds to the “presentation unit” in the present disclosure.
　図３には、運転者が交通事故に遭遇する危険を回避するために本実施例の運転支援装置１０が実行する運転支援処理のフローチャートが示されている。 FIG. 3 shows a flowchart of the driving support process executed by the driving support device 10 of the present embodiment in order to avoid the danger that the driver encounters a traffic accident.
　本実施例の運転支援処理は、運転者が眠気を感じていない間は、ディスプレイ１４の画面に地図情報を表示することによってカーナビゲーション機能を実現する。すなわち、先ず始めに現在位置検出部１２０を用いて車両１の現在位置を取得し（Ｓ１００）、続いて、ディスプレイ１４の画面上での表示範囲の設定を取得する（Ｓ１０２）。表示範囲は、運転者によって制御部１２２に予め設定されている。 The driving support process of the present embodiment realizes a car navigation function by displaying map information on the screen of the display 14 while the driver does not feel sleepy. That is, first, the current position of the vehicle 1 is acquired using the current position detecting unit 120 (S100), and then the display range setting on the display 14 is acquired (S102). The display range is preset in the control unit 122 by the driver.
　そして、眠気度検出部１１０によって運転者の眠気度を検出し（Ｓ１０４）、検出した眠気度が「０」、すなわち全く眠気を感じていない場合は（Ｓ１０６：ｙｅｓ）、表示範囲の地図情報を記憶部１２４から読み出してディスプレイ１４の画面に表示する（Ｓ１０８）。尚、運転者によって目的地が設定されている場合には、現在位置から目的地までの道順を検出して、地図情報に重ねて目的地への道順を表示する。また、道順を検出する処理は制御部１２２によって行われていることから、本実施例では制御部１２２が本開示における「道順検出部」に対応する。 Then, when the sleepiness level of the driver is detected by the sleepiness level detection unit 110 (S104) and the detected sleepiness level is “0”, that is, when no sleepiness is felt (S106: yes), the map information of the display range is displayed. The data is read from the storage unit 124 and displayed on the screen of the display 14 (S108). When the destination is set by the driver, the route from the current position to the destination is detected, and the route to the destination is displayed over the map information. In addition, since the process for detecting the route is performed by the control unit 122, in the present embodiment, the control unit 122 corresponds to the “route detection unit” in the present disclosure.
　その後、車両１の運転終了か否かを判断して（Ｓ１１０）、運転終了でなければ（Ｓ１１０：ｎｏ）、処理の先頭に戻って、車両１の現在位置を取得した後（Ｓ１００）、続く一連の処理を繰り返す。また、車両１の運転終了であった場合は（Ｓ１１０：ｙｅｓ）、運転支援処理も終了する。 Thereafter, it is determined whether or not the driving of the vehicle 1 is finished (S110). If the driving is not finished (S110: no), the process returns to the top of the process and the current position of the vehicle 1 is acquired (S100). Repeat a series of processes. Further, when the driving of the vehicle 1 is finished (S110: yes), the driving support process is also finished.
　このような運転支援処理を繰り返しているうちに、運転者が眠気を感じるようになると、眠気度検出部１１０で検出した眠気度が「０」ではないと判断されて（Ｓ１０６：ｎｏ）、以下に説明する第１実施例の休憩候補地提示処理（Ｓ２００）が開始される。 If the driver feels drowsy while repeating such driving support processing, it is determined that the drowsiness level detected by the drowsiness level detection unit 110 is not “0” (S106: no). The break candidate site presentation process (S200) according to the first embodiment described in the above is started.
　尚、本実施例では、カーナビゲーション機能は予め運転者によって起動されているものとしているが、運転者が眠気を感じていることが眠気度検出部１１０によって検出されたら、制御部１２２がカーナビゲーション機能を起動して本実施例の運転支援処理を開始し、運転支援処理の中から休憩候補地提示処理を実行するようにしても良い。 In this embodiment, the car navigation function is assumed to be activated in advance by the driver. However, if the drowsiness level detection unit 110 detects that the driver feels sleepy, the control unit 122 performs the car navigation function. The function may be activated to start the driving support process of the present embodiment, and the break candidate place presentation process may be executed from the driving support process.
　図４および図５には、第１実施例の休憩候補地提示処理のフローチャートが示されている。 FIG. 4 and FIG. 5 show a flowchart of the break candidate site presentation process of the first embodiment.
　休憩候補地提示処理（Ｓ２００）では、先ず始めに、運転者の眠気度に応じた移動可能距離を取得する（Ｓ２０２）。移動可能距離は、制御部１２２の図示しないＲＯＭに予め記憶されている。 In the break candidate site presentation process (S200), first, a movable distance corresponding to the driver's sleepiness is acquired (S202). The movable distance is stored in advance in a ROM (not shown) of the control unit 122.
　図６には、眠気度に応じて設定された移動可能距離が例示されている。図示されるように移動可能距離は、眠気度が大きくなるほど（運転者が感じる眠気が強くなるほど）、小さくなるように設定されている。尚、図示した例では、眠気度が増加すると移動可能距離が必ず小さくなるものとしているが、眠気度が増加しても移動可能距離が同じ値を維持する部分が一部に存在していても良い。 FIG. 6 illustrates the movable distance set according to the sleepiness level. As shown in the figure, the movable distance is set so as to decrease as the sleepiness level increases (the sleepiness felt by the driver increases). In the example shown in the figure, it is assumed that the movable distance decreases as the drowsiness level increases. However, even when the drowsiness level increases, there may be a portion where the movable distance maintains the same value. good.
　続いて、現在位置を中心とする移動可能距離内の範囲を探索範囲として、休憩候補地を探索する（Ｓ２０４）。前述したように記憶部１２４には、複数の休憩候補地が休憩候補地情報として記憶されており、それぞれの休憩候補地は地図情報と関連付けられている。そこで、それら休憩候補地の中から、探索範囲内に関連付けられているものを抽出することによって休憩候補地を探索する。 Subsequently, a break candidate site is searched for using a range within a movable distance centered on the current position as a search range (S204). As described above, the storage unit 124 stores a plurality of break candidate sites as break candidate site information, and each break candidate site is associated with map information. Therefore, a break candidate site is searched by extracting those associated with the search range from the break candidate sites.
　尚、現在位置を中心として移動可能距離を探索範囲として設定し、探索範囲内で休憩候補地を探索する処理は、制御部１２２が行っており、従って、本実施例では制御部１２２が本開示における「設定部」および「探索部」に対応する。 Note that the control unit 122 performs a process of setting a movable distance centered on the current position as a search range and searching for a break candidate site within the search range. Therefore, in the present embodiment, the control unit 122 discloses the present disclosure. Corresponds to “setting unit” and “search unit”.
　図７には、探索範囲内で複数の休憩候補地が検出された様子が例示されている。図示した例では、候補地ａ～候補地ｅの５つの休憩候補地が検出されている。 FIG. 7 illustrates a state where a plurality of break candidate sites are detected within the search range. In the example shown in the figure, five rest candidate sites from candidate site a to candidate site e are detected.
　次に、探索範囲内で休憩候補地が見つかったか否かを判断する（Ｓ２０６）。その結果、図７に例示したように探索範囲内で休憩候補地が見つかっていた場合は、Ｓ２０６で「ｙｅｓ」と判断して、最も近い休憩候補地に案内する旨の提案を、ディスプレイ１４の画面上に表示する（Ｓ２０８）。図８には、最も近い休憩候補地に案内する旨の提案が、ディスプレイ１４の画面上に表示された様子が例示されている。 Next, it is determined whether or not a break candidate site is found within the search range (S206). As a result, as illustrated in FIG. 7, when a break candidate site is found within the search range, it is determined as “yes” in S <b> 206, and a proposal for guiding to the nearest break candidate site is displayed on the display 14. It is displayed on the screen (S208). FIG. 8 illustrates a state in which a proposal for guiding to the nearest break candidate site is displayed on the screen of the display 14.
　そして、運転者がディスプレイ１４の画面上で「はい」と表示されたボタンを押すと、運転者が承認したと判断して（Ｓ２１０：ｙｅｓ）、最も近い休憩候補地への案内を開始する（Ｓ２１２）。図９には、案内開始に伴って、休憩候補地への道順（ルート）がディスプレイ１４の画面上に太い破線で表示された様子が例示されている。 Then, when the driver presses a button displayed as “Yes” on the screen of the display 14, it is determined that the driver has approved (S210: yes), and guidance to the nearest break candidate site is started (S210: yes). S212). FIG. 9 illustrates a state in which the route (route) to the break candidate site is displayed with a thick broken line on the screen of the display 14 with the start of guidance.
　これに対して、図８に例示した画面上で「いいえ」と表示されたボタンを運転者が押した場合は、運転者の承認が得られなかったものと判断して（Ｓ２１０：ｎｏ）、最も近い休憩候補地への案内は行わない。従って、図９に例示したようなルートがディスプレイ１４の画面上に表示されることもない。 On the other hand, when the driver presses the button displayed as “No” on the screen illustrated in FIG. 8, it is determined that the driver's approval has not been obtained (S210: no), No guidance to the nearest break candidate site. Accordingly, the route illustrated in FIG. 9 is not displayed on the screen of the display 14.
　続いて、最も近い休憩候補地がディスプレイ１４の画面上での表示範囲に収まっているか否かを判断する（図５のＳ２１４）。すなわち、休憩候補地は眠気度に応じて定まる移動可能距離の範囲内で探索されるのに対して、ディスプレイ１４で地図情報を表示している範囲（表示範囲）は運転者が設定する。従って、見つかった休憩候補地が、必ずしもディスプレイ１４上の表示範囲内にあるとは限らない。そこで、最も近い休憩候補地がディスプレイ１４の表示範囲内にあるか否かを判断して（Ｓ２１４）、表示範囲内に無かった場合は（Ｓ２１４：ｎｏ）、表示範囲を変更する旨の提案をディスプレイ１４の画面上に表示する（Ｓ２２０）。 Subsequently, it is determined whether or not the nearest break candidate site is within the display range on the screen of the display 14 (S214 in FIG. 5). In other words, the rest candidate site is searched for within the range of the movable distance determined according to the sleepiness level, while the range (display range) where the map information is displayed on the display 14 is set by the driver. Therefore, the found break candidate site is not necessarily within the display range on the display 14. Therefore, it is determined whether or not the nearest break candidate site is within the display range of the display 14 (S214), and if it is not within the display range (S214: no), a proposal to change the display range is made. It is displayed on the screen of the display 14 (S220).
　図１０には、表示範囲を変更する旨の提案が、ディスプレイ１４の画面上に表示された様子が例示されている。図１０に例示したディスプレイ１４の画面上で、運転者が「はい」と表示されたボタンを押すと、運転者の承認が得られたと判断して（Ｓ２２２：ｙｅｓ）、最も近い休憩候補地が収まるように地図情報の表示範囲を変更した後（Ｓ２２４）、地図情報の該当する位置に休憩候補地を表示する（Ｓ２１６）。 FIG. 10 illustrates a state in which a proposal for changing the display range is displayed on the screen of the display 14. When the driver presses the button displayed as “Yes” on the screen of the display 14 illustrated in FIG. 10, it is determined that the driver's approval has been obtained (S <b> 222: yes), and the nearest break candidate site is After changing the display range of the map information so as to fit (S224), the break candidate site is displayed at the corresponding position of the map information (S216).
　図１１には、ディスプレイ１４の画面上に、現在位置から最も近い休憩候補地が表示された様子が例示されている。尚、図中に細い破線で示した矩形は、変更する前の表示範囲を表している。 FIG. 11 exemplifies a state in which the candidate break location closest to the current position is displayed on the screen of the display 14. In addition, the rectangle shown with the thin broken line in the figure represents the display range before changing.
　これに対して、図１０に例示した画面上で「いいえ」と表示されたボタンを運転者が押した場合は、運転者の承認が得られなかったものと判断して（Ｓ２２２：ｎｏ）、表示範囲の変更は行わない。従って、この場合は、休憩候補地が存在する場所は表示範囲外となるので、休憩候補地がディスプレイ１４の画面上に表示されることはない。 On the other hand, when the driver presses the button displayed as “No” on the screen illustrated in FIG. 10, it is determined that the driver's approval has not been obtained (S222: no), The display range is not changed. Therefore, in this case, since the place where the break candidate site exists is outside the display range, the break candidate site is not displayed on the screen of the display 14.
　尚、最も近い休憩候補地が収まるように地図情報の表示範囲を変更して良いか否かを運転者に確認する処理は、制御部１２２が実行していることから、本実施例の制御部１２２は本開示における「照会部」に対応する。 In addition, since the control part 122 is performing the process which confirms with a driver | operator whether the display range of map information may be changed so that the nearest rest candidate site may be settled, the control part of a present Example. 122 corresponds to an “inquiry unit” in the present disclosure.
　一方、最も近い休憩候補地がディスプレイ１４の表示範囲内にあった場合は（Ｓ２１４：ｙｅｓ）、表示範囲を変更することなく、休憩候補地を表示する（Ｓ２１６）。このとき、表示範囲内に複数の休憩候補地が存在する場合には、所定数（たとえば５個）の休憩候補地を選択して表示するようにしても良い。選択に際しては、現在位置に近い順で選択しても良いし、面積や施設などに基づいて休憩候補地に予めランクを付けておき、ランクの高いものから順番に所定数を選択して表示するようにしても良い。 On the other hand, when the nearest break candidate site is within the display range of the display 14 (S214: yes), the break candidate site is displayed without changing the display range (S216). At this time, when a plurality of break candidate sites exist within the display range, a predetermined number (for example, five) of break candidate sites may be selected and displayed. When selecting, you may select in the order close to the current position, or rank the candidate break sites in advance based on area, facility, etc., and select and display a predetermined number in descending order of rank You may do it.
　続いて、見つかった休憩候補地情報の音声データを読み上げる（Ｓ２１８）。このため運転者は、ディスプレイ１４の画面に表示されていない休憩候補地も含めて、どのような休憩候補地が見つかったのかを知ることができる。また、運転者が表示範囲の変更を承認しなかった場合（Ｓ２２２：ｎｏ）でも、休憩候補地についての情報を知ることができる。尚、ここでは見つかった全ての休憩候補地の音声データを読み上げるものとしているが、ディスプレイ１４の画面上に表示された休憩候補地についてだけ、音声データを読み上げるようにしてもよい。 Subsequently, the voice data of the found break candidate site information is read out (S218). Therefore, the driver can know what break candidate sites have been found, including break candidate sites that are not displayed on the screen of the display 14. Further, even when the driver does not approve the change of the display range (S222: no), the information about the break candidate site can be known. Here, the audio data of all the break candidate sites found is read out, but the audio data may be read out only for the break candidate sites displayed on the screen of the display 14.
　以上では、移動可能距離内の探索範囲内で休憩候補地が見つかった場合（図４のＳ２０６：ｙｅｓ）に、運転者に休憩候補地を提示するための処理について説明した。これに対して、探索範囲内に休憩候補地が見つからなかった場合は（Ｓ２０６：ｎｏ）、運転を一時中止して休憩を取るように提案する画面をディスプレイ１４の画面上に表示する（Ｓ２２６）。図１２には、運転者に休憩を取るように提案する旨を表示した画面が例示されている。 In the above, the processing for presenting the candidate break site to the driver when the break candidate site is found within the search range within the movable distance (S206 of FIG. 4) has been described. On the other hand, when a break candidate site is not found within the search range (S206: no), a screen for proposing to suspend driving and take a break is displayed on the screen of the display 14 (S226). . FIG. 12 shows an example of a screen displaying that the driver is suggested to take a break.
　こうして、休憩候補地の情報を運転者に提示するか（図５のＳ２１６、Ｓ２１８）、あるいは運転を一時中止して休憩するように提案したら（図４のＳ２２６）、第１実施例の休憩候補地提示処理を終了して図３の運転支援処理に復帰する。 In this way, if information on the candidate break site is presented to the driver (S216, S218 in FIG. 5) or if it is proposed to temporarily stop driving and take a break (S226 in FIG. 4), the break candidate of the first embodiment The ground presentation process is terminated and the process returns to the driving support process of FIG.
　以上に説明したように、第１実施例の休憩候補地提示処理では、運転者が眠気を感じていることを検出すると休憩候補地を探索し、見つかった休憩候補地を、図１１に例示したように休憩場所として具体的に提示する。すなわち、判断力が低下した運転者に対して、たとえば「公園」の所在地を表示しても、運転者がその場所を休憩場所として認識できるとは限らない。これに対して、休憩場所として提示してやれば、たとえ判断力が低下した運転者であっても直ちに認識することができる。このため運転者は、判断力が低下したまま休憩場所を探して運転を続けてしまうことがなくなり、交通事故に遭遇する危険を回避することが可能となる。 As described above, in the break candidate site presentation process according to the first embodiment, when the driver detects drowsiness, the rest candidate site is searched, and the found break candidate sites are illustrated in FIG. So that it is specifically presented as a resting place. That is, for example, even if the location of “park” is displayed for a driver whose judgment has deteriorated, the driver may not always recognize the location as a rest location. On the other hand, if it is presented as a resting place, even a driver whose judgment power has been reduced can be immediately recognized. For this reason, the driver does not continue to drive while looking for a resting place with a reduced judgment, and the danger of encountering a traffic accident can be avoided.
　また、休憩候補地は、運転者の眠気度に応じた移動可能距離の範囲内で探索されており、眠気度が大きくなるほど移動可能距離が小さくなるように設定されている。このため、強い眠気を感じる運転者に対して、休憩候補地で休憩するために長い距離を移動させることもない。その結果、交通事故に遭遇する危険をより一層確実に回避可能となる。
（第２実施例）
　以下、図１３および図１４に基づいて、運転者が設定した目的地を考慮して休憩候補地を提示する第２実施例の休憩候補地提示処理を説明する。上述した第１実施例の休憩候補地提示処理では、運転者が向かおうとしている目的地とは無関係に、現在位置を中心として移動可能距離内にある休憩候補地を探索して運転者に提示した。これに対して、運転者がカーナビゲーション機能を用いて目的地を設定している場合には、運転者が設定した目的地も考慮して休憩候補地を探索するようにしてもよい。 Further, the break candidate site is searched for within the range of the movable distance corresponding to the driver's sleepiness level, and is set so that the movable distance decreases as the sleepiness level increases. For this reason, the driver who feels strong sleepiness does not move a long distance in order to take a break at the break candidate site. As a result, the danger of encountering a traffic accident can be more reliably avoided.
(Second embodiment)
Hereinafter, based on FIG. 13 and FIG. 14, a break candidate place presentation process of the second embodiment that presents a break candidate place in consideration of the destination set by the driver will be described. In the break candidate location presenting process of the first embodiment described above, a candidate for a break within a movable distance centered on the current position is searched and presented to the driver regardless of the destination the driver is about to go to. did. On the other hand, when the driver has set a destination using the car navigation function, the candidate for a break may be searched in consideration of the destination set by the driver.
　図１３および図１４は、運転者が設定した目的地を考慮して休憩候補地を提示する第２実施例の休憩候補地提示処理のフローチャートである。この処理は、図３に示した運転処理の中で眠気度が「０」ではないと判断した場合に（Ｓ１０６：ｎｏ）、前述した第１の休憩候補地提示処理（Ｓ２００）の代わりに実行される処理である。 FIG. 13 and FIG. 14 are flowcharts of a break candidate location presentation process of the second embodiment in which a break candidate location is presented in consideration of the destination set by the driver. This process is executed instead of the above-described first break candidate site presentation process (S200) when the drowsiness is determined not to be “0” in the driving process shown in FIG. 3 (S106: no). Process.
　第２実施例の休憩候補地提示処理（Ｓ３００）においても、先ず始めに、運転者の眠気度に応じた移動可能距離を取得する（Ｓ３０２）。続いて、第２実施例の休憩候補地提示処理では、ルート外れ許容距離を取得する（Ｓ３０４）。ここで、ルート外れ許容距離とは、運転者が設定した目的地に向かうルートからどの程度外れた位置の休憩候補地まで探索するかを示す値である。 Also in the break candidate site presentation process (S300) of the second embodiment, first, a movable distance corresponding to the driver's sleepiness is obtained (S302). Subsequently, in the break candidate site presentation process of the second embodiment, an off-route allowable distance is acquired (S304). Here, the off-route allowable distance is a value indicating how far a candidate for a break is searched from a route to the destination set by the driver.
　すなわち、第２実施例では、運転者が設定した目的地に向かって走行している途中に、運転者の眠気が検出されたので休憩候補地を提示することを想定しているから、休憩候補地を探索する時点ではルート上を走行しているものと考えられる。また、運転者は目的地に向かうルートからは、あまり外れたくないと思うものである。その一方で、ルート上に限定して探索したのでは、移動可能距離内に休憩候補地が見つからない場合も起こり得る。そこで、休憩候補地を探索する際には、走行中のルートからどの程度外れた位置まで休憩候補地を探索するかを予め設定しておく。本実施例では、移動可能距離と同様に、ルート外れ許容距離も運転者の眠気度に応じて予め設定されており、制御部１２２の図示しないＲＯＭに予め記憶されている。 That is, in the second embodiment, since it is assumed that the driver's drowsiness is detected while driving toward the destination set by the driver, it is assumed that the candidate for the break is presented. At the time of searching the ground, it is considered that the vehicle is traveling on the route. Also, the driver does not want to deviate much from the route to the destination. On the other hand, if the search is limited to the route, there may be a case where no break candidate site is found within the movable distance. Therefore, when searching for a break candidate site, it is set in advance how far the break candidate site is to be searched from a position that is out of the traveling route. In the present embodiment, like the movable distance, the off-route allowable distance is set in advance according to the driver's sleepiness and stored in advance in a ROM (not shown) of the control unit 122.
　尚、本実施例のルート外れ許容距離は、本開示の「外れ許容距離」に対応する。従って、移動可能距離Ｌおよびルート外れ許容距離Ｌａを記憶している制御部１２２は、本開示における「距離記憶部」に対応する。 In addition, the route deviation allowable distance of the present embodiment corresponds to “displacement allowable distance” of the present disclosure. Therefore, the control unit 122 that stores the movable distance L and the off-route allowable distance La corresponds to a “distance storage unit” in the present disclosure.
　図１５には、制御部１２２の図示しないＲＯＭに、眠気度に応じて設定された移動可能距離Ｌおよびルート外れ許容距離Ｌａが記憶された様子が概念的に示されている。図示されるように、移動可能距離Ｌは眠気度が大きくなるほど（運転者が感じる眠気が強くなるほど）小さくなるように設定されている。これに対して、ルート外れ許容距離Ｌａは、眠気度が大きくなるほど、大きな値となるように設定されている。但し、ルート外れ許容距離Ｌａが移動可能距離Ｌよりも大きくなることはない。休憩候補地の探索範囲は、このような移動可能距離Ｌおよび許容距離Ｌａに基づいて、次のようにして設定される。 FIG. 15 conceptually shows a state in which the movable distance L and the off-route allowable distance La set according to the sleepiness level are stored in the ROM (not shown) of the control unit 122. As shown in the figure, the movable distance L is set so as to decrease as the sleepiness level increases (the sleepiness felt by the driver increases). On the other hand, the off-route allowable distance La is set to increase as the sleepiness level increases. However, the off-route allowable distance La does not become larger than the movable distance L. The search range for the break candidate site is set as follows based on the movable distance L and the allowable distance La.
　たとえば、眠気度が小さい場合（図１５中の眠気度Ａ）には、移動可能距離Ｌは大きいが、ルート外れ許容距離Ｌａは小さな値が設定されている。このため、図１６（ａ）に示したように、ルートからはあまり外れることができないが、ルートに沿ってならば遠くの休憩候補地まで探索することができる。 For example, when the sleepiness level is small (sleepiness level A in FIG. 15), the movable distance L is large, but the off-route allowable distance La is set to a small value. For this reason, as shown in FIG. 16 (a), it is difficult to deviate from the route, but it is possible to search to a distant rest candidate site along the route.
　また、眠気度が大きい場合（図１５中の眠気度Ｃ）には、移動可能距離Ｌは小さくなるが、ルート外れ許容距離Ｌａは移動可能距離Ｌとほぼ同じ値まで大きくなる。このため、図１６（ｂ）に示したように、ルートに沿っては遠くまで進むことはできないが、ルートから外れた比較的遠くの休憩候補地まで探索することができる。 Further, when the sleepiness level is large (sleepiness level C in FIG. 15), the movable distance L is small, but the off-route allowable distance La is large to almost the same value as the movable distance L. For this reason, as shown in FIG. 16B, it is not possible to travel far along the route, but it is possible to search for a relatively far break candidate site off the route.
　もちろん、ルートに沿っての移動距離Ｌ１と、ルートから外れての移動距離Ｌ２との合計が移動可能距離Ｌを超えることはできない。従って、たとえば眠気度が大きい場合に、図１６（ｂ）に示した状態よりもルートに沿って遠くの距離Ｌ１まで移動した場合には、ルートから外れて移動することができる距離Ｌ２は、図１６（ｂ）に示した状態よりもその分だけ短くなる（図１６（ｃ）参照）。 Of course, the sum of the moving distance L1 along the route and the moving distance L2 off the route cannot exceed the movable distance L. Accordingly, for example, when the sleepiness level is large, when the distance L1 is farther along the route than the state shown in FIG. 16B, the distance L2 that can be moved off the route is as shown in FIG. That is shorter than the state shown in FIG. 16B (see FIG. 16C).
　図１７（ａ）～図１７（ｃ）には、このようにして休憩候補地の探索範囲が設定された様子が例示されている。図１７（ａ）は、眠気度が小さい場合の探索範囲を表しており、図１７（ｂ）は眠気度が中くらいの場合を表している。尚、図中に示した太い破線は、運転者によって設定された目的地へのルートである。 FIG. 17 (a) to FIG. 17 (c) exemplify how the search range for the break candidate site is set in this way. FIG. 17A shows the search range when the sleepiness level is low, and FIG. 17B shows the case where the sleepiness level is medium. In addition, the thick broken line shown in the figure is the route to the destination set by the driver.
　図１７（ａ）と図１７（ｂ）とを比較すれば明らかなように、眠気度が小さい場合は、ルートに沿って遠くの休憩候補地まで探索することができるが、ルートから外れた休憩候補地はほとんど探索できない。これに対して中くらいの眠気度では、ルートに沿って探索可能な距離は短くなるが、ルートから少し外れた距離まで探索することができる。 As is clear from comparison between FIG. 17A and FIG. 17B, when the drowsiness level is small, it is possible to search for a candidate for a far break along the route, but a break off the route. Candidate sites can hardly be searched. On the other hand, at medium sleepiness, the searchable distance along the route is short, but it is possible to search to a distance slightly off the route.
　尚、探索範囲は、ルートに沿った移動距離が短い間はルート外れ許容距離Ｌａによって制限され、ルートに沿った移動距離が長くなると移動可能距離Ｌによって制限される。このため、図１７（ｂ）に示されるように休憩候補地の探索範囲は、自車両の前方に向かって暫くの間はルートを中心として両側に一定幅ずつ範囲となり、その後はルートに沿って遠くに行くほど、両側の幅が狭くなるような範囲となる。 Note that the search range is limited by the off-route allowable distance La when the moving distance along the route is short, and limited by the movable distance L when the moving distance along the route becomes long. For this reason, as shown in FIG. 17 (b), the search range of the break candidate site is a range with a certain width on both sides centering on the route for a while toward the front of the host vehicle, and then along the route. The farther away, the smaller the width on both sides.
　また、図１７（ｃ）には眠気度が非常に大きい場合の探索範囲が示されている。眠気度が非常に大きい場合は、移動可能距離Ｌとルート外れ許容距離Ｌａとがほぼ等しくなるから（図１５参照）、自車両の現在位置を中心としてほぼ移動可能距離Ｌの範囲が探索範囲となる。 In addition, FIG. 17C shows a search range when the sleepiness level is very large. When the drowsiness is very large, the movable distance L and the off-route allowable distance La are substantially equal (see FIG. 15), and therefore the range of the substantially movable distance L around the current position of the host vehicle is the search range. Become.
　尚、図１７（ａ）～図１７（ｃ）では、自車両の現在位置から進行方向に対して後方の休憩候補地は探索しないものとして説明した。しかし、自車両の現在位置を中心に、ルート外れ許容距離Ｌａの半径の範囲内で、進行方向に対して後方の休憩候補地も探索するようにしても良い。 In FIGS. 17 (a) to 17 (c), it has been described that no candidate for a rest point is searched for in the direction of travel from the current position of the host vehicle. However, it is also possible to search for a break candidate site behind the traveling direction within the radius range of the off-route allowable distance La around the current position of the host vehicle.
　図１３のＳ３０６では、以上のようにして、眠気度に応じた移動可能距離Ｌおよびルート外れ許容距離Ｌａに基づいて探索範囲を設定し、探索範囲内の休憩候補地を探索する。 In S306 of FIG. 13, as described above, a search range is set based on the movable distance L and the off-route allowable distance La according to the sleepiness level, and a break candidate site in the search range is searched.
　次に、探索範囲内で且つルート上に休憩候補地が見つかったか否かを判断する（Ｓ３０８）。たとえば、図１８に例示したように、探索範囲内のルート上には、候補地ａおよび候補地ｂの２つの休憩候補地が見つかったものとする。この場合、図１３のＳ３０８では「ｙｅｓ」と判断され、続いて、見つかった最も近い休憩候補地（図１８の例示では候補地ａ）が、ディスプレイ１４の表示範囲内に収まるか否かを判断する（図１４のＳ３１８）。 Next, it is determined whether or not a break candidate site is found within the search range and on the route (S308). For example, as illustrated in FIG. 18, it is assumed that two rest candidate sites, candidate site a and candidate site b, are found on the route within the search range. In this case, it is determined as “yes” in S308 of FIG. 13, and subsequently, it is determined whether or not the nearest candidate break site found (candidate site a in the example of FIG. 18) is within the display range of the display 14. (S318 in FIG. 14).
　その結果、最も近い休憩候補地が表示範囲内に収まる場合は（Ｓ３１８：ｙｅｓ）、ディスプレイ１４の画面上に休憩候補地を表示する（Ｓ３２０）。図１９には、ルート上に休憩候補地が表示された様子が例示されている。また、表示範囲内に複数の休憩候補地が存在する場合には、所定数（たとえば５個）の休憩候補地を選択して表示するようにしても良い。 As a result, when the nearest break candidate place falls within the display range (S318: yes), the break candidate place is displayed on the screen of the display 14 (S320). FIG. 19 illustrates a state where a break candidate site is displayed on the route. In addition, when there are a plurality of break candidate sites within the display range, a predetermined number (for example, five) of break candidate sites may be selected and displayed.
　このように、探索範囲内のルート上に休憩候補地が見つかり（図１３のＳ３０８：ｙｅｓ）、且つ、最も近い休憩候補地が現在の表示範囲内に収まる場合は（図１４のＳ３１８：ｙｅｓ）、単にその休憩候補地を現在の画面上に表示するだけでよい。こうすれば、運転者はルート上に休憩候補地が存在することを直ちに認識することができる。 As described above, when a break candidate site is found on the route within the search range (S308 in FIG. 13: yes) and the nearest break candidate site is within the current display range (S318 in FIG. 14: yes). It is sufficient to simply display the break candidate site on the current screen. In this way, the driver can immediately recognize that there is a break candidate site on the route.
　これに対して、最も近い休憩候補地が表示範囲内に収まらない場合は（Ｓ３１８：ｎｏ）、第１実施例と同様に、図１０に例示するような表示範囲を変更する旨の提案をディスプレイ１４の画面上に表示する（Ｓ３２４）。そして、運転者がディスプレイ１４の画面上で「はい」と表示されたボタンを押すと、運転者が承認したと判断して（Ｓ３２６：ｙｅｓ）、最も近い休憩候補地が収まるように地図情報の表示範囲を変更した後（Ｓ３２８）、図１９に示したように、表示画面上の該当する位置に休憩候補地を表示する（Ｓ３２０）。 On the other hand, when the nearest break candidate site does not fall within the display range (S318: no), a proposal for changing the display range as illustrated in FIG. 10 is displayed as in the first embodiment. 14 is displayed on the screen (S324). Then, when the driver presses the button labeled “Yes” on the screen of the display 14, it is determined that the driver has approved (S326: yes), and the map information is displayed so that the nearest rest candidate site can be accommodated. After changing the display range (S328), as shown in FIG. 19, a break candidate site is displayed at a corresponding position on the display screen (S320).
　一方、表示範囲を変更する旨の提案に対して運転者の承認が得られなかった場合には（Ｓ３２６：ｎｏ）、表示範囲の変更は行わない。従って、この場合は、休憩候補地が存在する場所は表示範囲外となるので、休憩候補地がディスプレイ１４の画面上に表示されることはない。 On the other hand, if the driver's approval for the proposal to change the display range is not obtained (S326: no), the display range is not changed. Therefore, in this case, since the place where the break candidate site exists is outside the display range, the break candidate site is not displayed on the screen of the display 14.
　以上では、探索範囲内のルート上に休憩候補地が見つかった場合（図１３のＳ３０８：ｙｅｓ）の処理について説明した。 In the above, the processing when the break candidate site is found on the route within the search range (S308: yes in FIG. 13) has been described.
　これに対して、探索範囲内のルート上には休憩候補地が見つからなかった場合は（Ｓ３０８：ｎｏ）、ルートから外れた探索範囲内に休憩候補地が見つかったか否かを判断する（Ｓ３１０）。その結果、ルートから外れた位置にも探索範囲内には休憩候補地が見つからなかった場合は（Ｓ３１０：ｎｏ）、探索範囲内には休憩候補地が見つからなかったことになるので、第１実施例と同様に、運転を中止して休憩するように提案する画面（図１２参照）をディスプレイ１４の画面上に表示する（Ｓ３３０）。 On the other hand, when a break candidate site is not found on the route within the search range (S308: no), it is determined whether a break candidate site is found within the search range off the route (S310). . As a result, if a break candidate site is not found in the search range even at a position off the route (S310: no), a break candidate site is not found in the search range. Similar to the example, a screen (see FIG. 12) for suggesting to stop driving and take a break is displayed on the screen of the display 14 (S330).
　一方、図２０に例示するように、ルート上の探索範囲内には休憩候補地は存在しないが、ルートから外れた探索範囲内には休憩候補地が存在する場合は、図１３のＳ３１０で「ｙｅｓ」と判断される。そしてこの場合は、第１実施例と同様に、最も近い休憩候補地に案内する旨を提案する画面（図８参照）を、ディスプレイ１４の画面上に表示する（Ｓ３１２）。すなわち、ルート上に休憩候補地が見つかった場合（Ｓ３０８：ｙｅｓ）は、現在のルートがそのまま休憩候補地に案内するルートとなるが、休憩候補地がルートから外れた位置に見つかった場合（Ｓ３１０：ｙｅｓ）は、現在のルートのままでは休憩候補地に到着することはできない。そこで、現在のルートを変更して最寄りの休憩候補地に迂回するように、運転者に提案するのである。 On the other hand, as illustrated in FIG. 20, when there is no break candidate site within the search range on the route, but there is a break candidate site within the search range off the route, in S310 of FIG. yes ". In this case, as in the first embodiment, a screen (see FIG. 8) for proposing guidance to the nearest break candidate site is displayed on the screen of the display 14 (S312). That is, when a break candidate site is found on the route (S308: yes), the current route is a route that directly guides the break candidate site, but when a break candidate site is found at a position off the route (S310). : Yes) cannot arrive at the break candidate site with the current route. Therefore, it is suggested to the driver to change the current route and make a detour to the nearest break candidate site.
　そして、運転者がディスプレイ１４の画面上で「はい」と表示されたボタンを押すと、運転者の承認が得られたと判断して（Ｓ３１４：ｙｅｓ）、最も近い休憩候補地へ迂回するように案内のルートを変更する（Ｓ３１６）。図２０に示した例では、ルートから外れた探索範囲内には、２つの休憩候補地（候補地ｃおよび候補地ｄ）が存在しているが、この中で自車両に近い候補地ｃに迂回するように、案内のルートが変更されることになる。また、案内のルートが変更されたことに伴って、ディスプレイ１４の画面上でのルートの表示も変更される。 Then, when the driver presses the button labeled “Yes” on the screen of the display 14, it is determined that the driver's approval has been obtained (S314: yes), and the driver makes a detour to the nearest break candidate site. The route for guidance is changed (S316). In the example shown in FIG. 20, there are two break candidate sites (candidate site c and candidate site d) in the search range off the route. The route of guidance is changed so as to detour. Further, the display of the route on the screen of the display 14 is also changed in accordance with the change of the guidance route.
　これに対して、運転者が「いいえ」と表示されたボタンを押した場合は、運転者の承認が得られなかったものと判断して（Ｓ３１４：ｎｏ）、ルートの変更は行わない。 On the other hand, if the driver presses a button labeled “No”, it is determined that the driver's approval has not been obtained (S314: no), and the route is not changed.
　続いて、最も近い休憩候補地（ここでは候補地ｃ）がディスプレイ１４の表示範囲に収まっているか否かを判断し（図１４のＳ３１８）、表示範囲内にあれば（Ｓ３１８：ｙｅｓ）、表示範囲内の該当する位置に休憩候補地を提示する（Ｓ３２０）。このとき、最寄りの休憩候補地への道順案内を運転者が承認して（図１３のＳ３１４：ｙｅｓ）、休憩候補地に迂回するようにルートが変更（Ｓ３１６）されていた場合には、図２１（ａ）に例示したように、ルートから外れた探索範囲内の休憩候補地および休憩候補地に迂回するルートが、ディスプレイ１４の画面上に表示された様子が例示される。 Subsequently, it is determined whether or not the nearest break candidate site (candidate site c here) is within the display range of the display 14 (S318 in FIG. 14), and if it is within the display range (S318: yes), the display A break candidate site is presented at a corresponding position within the range (S320). At this time, if the driver approves the route guidance to the nearest break candidate site (S314: yes in FIG. 13) and the route has been changed to detour to the break candidate site (S316), As exemplified in 21 (a), a state where a break candidate site within the search range deviating from the route and a route detouring to the break candidate site are displayed on the screen of the display 14 is exemplified.
　これに対して、最寄りの休憩候補地への道順案内を運転者が承認せず（図１３のＳ３１４：ｎｏ）、従って、休憩候補地に迂回するようにルートが変更されていなかった場合は、図２１（ｂ）に例示したように、（休憩候補地に迂回せずに）目的地に向かうルートが表示されたままで、単に休憩候補地だけが表示されることになる。 On the other hand, if the driver does not approve the route guidance to the nearest break candidate site (S314 in FIG. 13: no), and therefore the route has not been changed to detour to the break candidate site, As illustrated in FIG. 21B, the route to the destination is displayed (without detouring to the break candidate site), and only the break candidate site is displayed.
　これに対して、最も近い休憩候補地がディスプレイ１４の表示範囲に収まっていなかった場合は（Ｓ３１８：ｎｏ）、表示範囲の変更を提案する画面（図１０参照）をディスプレイ１４の画面上に表示し（Ｓ３２４）、運転者の承認が得られれば（Ｓ３２４：ｙｅｓ）、最も近い休憩候補地が収まるように地図情報の表示範囲を変更した後（Ｓ３２８）、地図情報の該当する位置に休憩候補地を表示する（Ｓ３２０）。 On the other hand, when the nearest break candidate site is not within the display range of the display 14 (S318: no), a screen for suggesting a change of the display range (see FIG. 10) is displayed on the screen of the display 14. If the driver's approval is obtained (S324: yes), the display range of the map information is changed so that the nearest rest candidate place is settled (S328), and then the rest candidate is placed at the corresponding position of the map information. The ground is displayed (S320).
　これに対して、表示範囲を変更する旨の提案が運転者によって承認されなかった場合は（Ｓ３２６：ｎｏ）、表示範囲の変更は行わない。 On the other hand, when the proposal to change the display range is not approved by the driver (S326: no), the display range is not changed.
　そして、第２実施例の休憩候補地提示処理においても、前述した第１実施例の休憩候補地提示処理と同様に、見つかった休憩候補地情報の音声データを読み上げた後（Ｓ３２２）、図３の運転支援処理に復帰する。 Also, in the break candidate site presentation process of the second embodiment, as in the break candidate site presentation process of the first embodiment described above, after the voice data of the found break candidate site information is read (S322), FIG. Return to the driving support process.
　以上に説明した第２実施例では、運転者の眠気度が小さい場合には、ルートからあまり外れない範囲内で休憩候補地を探索する。休憩候補地を探索する範囲を、ルートからあまり外れない範囲に限定すると休憩候補地が見つかり難くなるが、眠気度が小さいのでルートに沿って長い距離を走ることができるので、実質的には休憩候補地が見つかり難くなることはない。 In the second embodiment described above, when the driver's drowsiness is small, a candidate for a break is searched for within a range that does not deviate much from the route. If you limit the search range for the candidate rest area to a range that does not deviate too much from the route, it will be difficult to find the rest candidate place, but you can run a long distance along the route because the sleepiness is low, so it is actually a break Candidate sites will not be difficult to find.
　また、眠気度が小さい場合、運転者も休憩の必要性はあまり感じていないので、ルートから外れた休憩候補地を提示しても、運転者に無視されてしまう可能性もある。これに対して、ルートからあまり外れない範囲の休憩候補地を提示してやれば、運転者を自然と休憩候補地に導いて休憩させることができるので、運転者が交通事故に遭遇する危険性を抑制することが可能となる。 Also, if the sleepiness is low, the driver does not feel much need for a break, so even if a candidate break place that is off the route is presented, it may be ignored by the driver. On the other hand, if you present a potential rest area that does not deviate too much from the route, you can naturally take the driver to the rest area and have them rest, thus reducing the risk that the driver will encounter a traffic accident. It becomes possible to do.
　また、運転者の眠気度が大きくなるに従って、ルートから外れた範囲まで休憩候補地を探索する。眠気度が大きくなる程、交通事故に遭遇する危険性が高くなるので、遠くの休憩候補地を提示することは適当ではない。しかし、ルートから外れた範囲まで探索するようにすれば、遠くまで探索しなくても休憩候補地を見付けることができる。また、眠気度が大きくなると運転者も休憩の必要性を認識しているので、ルートから外れた位置の休憩候補地が提示された場合でも無視する可能性が低い。このため、運転者を速やかに休憩候補地に導いて休憩させることができるので、運転者が交通事故に遭遇する危険性を抑制することが可能となる。
（他の実施形態）
　以上、各種の実施例について説明したが、本開示は上記の実施例に限られるものではなく、その要旨を逸脱しない範囲において種々の態様で実施することができる。 In addition, as the driver's sleepiness increases, the candidate for a break is searched for in a range off the route. The greater the drowsiness, the higher the risk of encountering a traffic accident. Therefore, it is not appropriate to present a far-off candidate site. However, if the search is made to the range off the route, the break candidate site can be found without searching far. Further, since the driver recognizes the necessity of a break when the sleepiness level increases, the possibility of ignoring even when a break candidate site at a position off the route is presented is low. For this reason, it is possible to promptly bring the driver to the break candidate site and make the driver take a break, thereby suppressing the risk that the driver will encounter a traffic accident.
(Other embodiments)
Although various embodiments have been described above, the present disclosure is not limited to the above embodiments, and can be implemented in various modes without departing from the scope of the present disclosure.
　たとえば、運転者の眠気度が大きくなるほど、目立ちやすい態様（たとえば点滅表示させる態様）で休憩候補地を提示するようにしても良い。こうすれば、眠気を感じて運転者の判断力が低下している場合でも、休憩候補地が提示されていることを運転者に確実に認識させることができる。 For example, the break candidate site may be presented in a more conspicuous manner (for example, blinking manner) as the driver's sleepiness increases. In this way, even when the driver feels drowsy and the driver's judgment is reduced, the driver can be surely recognized that the break candidate site is presented.
　また、上述した各種の実施例では、運転者の眠気度に応じて休憩候補地の探索範囲を変更するものとして説明した。しかし、探索範囲だけでなく、休憩候補地として提示する内容を、眠気度に応じて変更しても良い。たとえば、駐停車禁止でない路肩などのように、眠気度が小さい場合には休憩候補地として提示しない対象も、眠気度が大きい場合には、休憩候補地として提示するようにしても良い。こうすれば、眠気度が大きくなって出来るだけ早く休憩する必要が生じた場合に、最寄りの休憩候補地を確実に運転者に提示することが可能となる。 In the various embodiments described above, the search range of the break candidate site is changed according to the driver's sleepiness level. However, not only the search range but also the content presented as a break candidate site may be changed according to the sleepiness level. For example, an object that is not presented as a candidate for a break when the drowsiness is low, such as a shoulder that is not prohibited from parking or stopping, may be presented as a candidate for a break when the drowsiness is high. In this way, when it becomes necessary to take a break as soon as possible due to increased sleepiness, it is possible to reliably present the nearest break candidate site to the driver.
　また、上述した運転支援装置１０において、覚醒度合いの低下が検出された場合には、その覚醒度合いに基づいて設定された探索範囲内で休憩候補地を探索してもよい。 Further, in the driving support device 10 described above, when a decrease in the degree of arousal is detected, a break candidate site may be searched for within a search range set based on the degree of arousal.
　覚醒度合いが違えば、休憩の必要な程度も違い、安全に走行可能な距離も違うと考えられる。従って、覚醒度合いに応じて設定した探索範囲で休憩候補地を探索してやれば、適切な休憩候補地を探索することが可能となる。 If the degree of wakefulness is different, the necessary degree of break is also different, and the distance that can be traveled safely is considered to be different. Therefore, if a break candidate site is searched in the search range set according to the awakening degree, it is possible to search for an appropriate break candidate site.
　また、上述した運転支援装置１０において、運転支援装置１０が、現在位置から運転者によって設定された目的地までの道順を地図情報から検出する機能を備えている場合には、休憩候補地の探索範囲を次のように設定してもよい。先ず、現在位置から移動可能な距離である移動可能距離と、目的地までの道順から外れることが許容される外れ許容距離とを、覚醒度合いに応じて記憶しておく。そして、覚醒度合いの低下が検出された場合には、覚醒度合いに応じた移動可能距離および外れ許容距離を読み出して、それらに基づいて探索範囲を設定することとしてもよい。 In addition, in the driving support device 10 described above, when the driving support device 10 has a function of detecting a route from the current position to the destination set by the driver from the map information, a search for a candidate for a break is made. The range may be set as follows. First, a movable distance, which is a distance that can be moved from the current position, and an allowable deviation distance that is allowed to deviate from the route to the destination are stored according to the degree of arousal. And when the fall of a wakefulness level is detected, it is good also as reading the movable distance according to the wakefulness level, and the deviation | shift-out allowable distance, and setting a search range based on them.
　運転者によって目的地が設定されている場合には、目的地への道順から外れた休憩候補地に向かうことには、運転者は多少の抵抗を感じるものである。従って、覚醒度合いの低下が小さい場合には、目的地への道順から外れた休憩候補地を提示しても運転者によって無視されてしまう虞がある。その一方で、覚醒度合いの低下が大きい場合は、運転者も休憩の必要性を感じているので、目的地への道順から外れた休憩候補地を提示しても運転者によって無視されてしまう虞は少ない。このことから、覚醒度合いに応じて設定された移動可能距離および外れ許容距離に基づいて休憩候補地の探索範囲を設定してやれば、適切な休憩候補地を探索して運転者に提示することが可能となる。 When the destination is set by the driver, the driver feels a little resistance to heading to the break candidate site that is off the route to the destination. Therefore, when the decrease in the degree of arousal is small, there is a possibility that the driver may ignore a rest candidate site that deviates from the route to the destination. On the other hand, if the degree of arousal is large, the driver also feels the need for a break, so even if a candidate break place that is off the route to the destination is presented, it may be ignored by the driver There are few. From this, it is possible to search for suitable rest candidate sites and present them to the driver if the search range of the rest candidate sites is set based on the movable distance and the allowable deviation distance set according to the awakening degree. It becomes.
　また、覚醒度合いに応じて設定された探索範囲内で休憩候補地を探索する上述した運転支援装置１０においては、次のようにしても良い。先ず、探索範囲から探索された休憩候補地が、運転者に提示中の周辺地域に存在するか否かを判断する。そして、探索した休憩候補地が提示中の周辺地域には存在していない場合には、提示する周辺地域の範囲を変更するか否かを運転者に照会する。その結果、運転者の承認が得られた場合には、探索した休憩候補地が少なくとも１つ含まれる周辺地域の地図情報を読み出して、休憩候補地と共に運転者に提示するようにしてもよい。 Further, in the above-described driving support device 10 that searches for a break candidate site within the search range set according to the awakening degree, the following may be performed. First, it is determined whether or not the break candidate site searched from the search range exists in the surrounding area being presented to the driver. Then, if the searched break candidate site does not exist in the surrounding area being presented, the driver is inquired whether or not to change the range of the surrounding area to be presented. As a result, when the driver's approval is obtained, the map information of the surrounding area including at least one searched break candidate site may be read and presented to the driver together with the break candidate site.
　こうすれば、運転者に提示中の周辺地域の外側に休憩候補地が見つかった場合でも、その休憩候補地の場所を、運転者に具体的に提示することができる。また、運転者に提示される周辺地域の範囲が、運転者の知らない間に変更されることもないので、判断力が低下した運転者であっても戸惑うことがない。 In this way, even when a break candidate site is found outside the surrounding area being presented to the driver, the location of the break candidate site can be specifically presented to the driver. In addition, since the range of the surrounding area presented to the driver is not changed without the driver's knowledge, the driver who has a low judgment power is not confused.
　本開示は、実施例に準拠して記述されたが、本開示は当該実施例や構造に限定されるものではないと理解される。本開示は、様々な変形例や均等範囲内の変形をも包含する。加えて、様々な組み合わせや形態、さらには、それらに一要素のみ、それ以上、あるいはそれ以下、を含む他の組み合わせや形態をも、本開示の範疇や思想範囲に入るものである。 Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims (5)

  1. 　車両の運転者に対して現在位置を含んだ周辺地域の地図情報を提示することによって運転支援を行う運転支援装置であって、
    　前記地図情報を記憶しておく記憶部（１２４）と、
    　前記車両の現在位置を検出する現在位置検出部（１２０）と、
    　前記現在位置を含んだ前記周辺地域の前記地図情報を前記記憶部（１２４）から読み出して、前記運転者に提示する提示部（１２２）と、
    　前記運転者の覚醒度合いを検出する覚醒度合い検出部（１１０）と
    　を備え、
    　前記記憶部（１２４）は、前記車両を停車させて休憩可能な場所である休憩候補地を、前記地図情報に関連付けて記憶し、
    　前記提示部（１２２）は、前記覚醒度合い検出部（１１０）が前記覚醒度合いの低下を検出した場合には、前記地図情報に加えて、該地図情報に関連付けられた前記休憩候補地も前記運転者に提示する運転支援装置。     A driving assistance device that provides driving assistance by presenting map information of a surrounding area including a current position to a driver of a vehicle,
    A storage unit (124) for storing the map information;
    A current position detector (120) for detecting a current position of the vehicle;
    A presentation unit (122) for reading out the map information of the surrounding area including the current position from the storage unit (124) and presenting the information to the driver;
    An awakening degree detection unit (110) for detecting the awakening degree of the driver,
    The storage unit (124) stores a break candidate site, which is a place where the vehicle can be stopped and can take a break, in association with the map information,
    When the arousal level detection unit (110) detects a decrease in the awakening level, the presenting unit (122) also includes the rest candidate site associated with the map information in addition to the map information. Driving assistance device presented to the user.
  2. 　前記覚醒度合い検出部（１１０）が前記覚醒度合いの低下を検出した場合には、該覚醒度合いに基づいて前記休憩候補地の探索範囲を設定する設定部（１２２）と、
    　前記探索範囲内の前記地図情報に関連付けられた前記休憩候補地を探索する探索部（１２２）と
    　をさらに備える請求項１に記載の運転支援装置。     A setting unit (122) for setting a search range for the break candidate site based on the awakening level when the awakening level detection unit (110) detects a decrease in the awakening level;
    The driving support device according to claim 1, further comprising: a search unit (122) that searches for the break candidate site associated with the map information within the search range.
  3. 　前記運転者によって設定された目的地を取得して、前記現在位置から該目的地への道順を前記地図情報から検出する道順検出部（１２２）と、
    　前記現在位置から移動可能な距離である移動可能距離と、前記道順から外れることが許容される外れ許容距離とを、前記覚醒度合いに応じて記憶している距離記憶部（１２２）と
    　をさらに備え、
    　前記設定部（１２２）は、前記覚醒度合いに応じた前記移動可能距離および前記外れ許容距離に基づいて、前記探索範囲を設定する請求項２に記載の運転支援装置。     A route detection unit (122) for acquiring a destination set by the driver and detecting a route from the current position to the destination from the map information;
    A distance storage unit (122) that stores a movable distance that is a distance that can be moved from the current position and an allowable deviation distance that is allowed to deviate from the route according to the degree of arousal. ,
    The driving support device according to claim 2, wherein the setting unit (122) sets the search range based on the movable distance and the allowance distance according to the awakening degree.
  4. 　前記提示部（１２２）によって前記運転者に提示中の前記周辺地域に、前記探索部（１２２）によって探索された前記休憩候補地が存在していない場合には、提示する該周辺地域の範囲を変更するか否かを該運転者に照会する照会部（１２２）をさらに備え、
    　前記提示部（１２２）は、前記照会部（１２２）によって前記運転者の承認が得られた場合に、前記休憩候補地が少なくとも１つ含まれる前記周辺地域の前記地図情報を読み出して、該休憩候補地と共に前記運転者に提示する請求項２または請求項３に記載の運転支援装置。     In the case where the break candidate site searched by the search unit (122) does not exist in the surrounding area being presented to the driver by the presenting unit (122), the range of the surrounding area to be presented is determined. An inquiry unit (122) for inquiring the driver whether or not to change,
    The presentation unit (122) reads out the map information of the surrounding area including at least one break candidate site when the driver's approval is obtained by the inquiry unit (122). The driving support device according to claim 2 or 3, wherein the driving support device is presented to the driver together with a candidate site.
  5. 　車両の運転者に対して現在位置を含んだ周辺地域の地図情報を提示することによって運転支援を行う運転支援方法であって、
    　前記地図情報を記憶し、
    　前記車両を停車させて休憩可能な場所である休憩候補地を、前記地図情報に関連付けて記憶し、
    　前記車両の現在位置を検出し、
    　前記現在位置を含んだ前記周辺地域の前記地図情報を読み出して、前記運転者に提示し、
    　前記運転者の覚醒度合いを検出すること
    　を備え、
    　前記地図情報の前記運転者への提示において、前記覚醒度合いの低下が検出された場合には、前記地図情報に加えて、該地図情報に関連付けられた前記休憩候補地も前記運転者に提示する運転支援方法。     A driving support method for supporting driving by presenting map information of a surrounding area including a current position to a driver of a vehicle,
    Storing the map information;
    A candidate for a break that is a place where the vehicle can be stopped and can take a break is stored in association with the map information,
    Detecting the current position of the vehicle;
    Read out the map information of the surrounding area including the current position, present it to the driver,
    Detecting the degree of arousal of the driver,
    In the presentation of the map information to the driver, when a decrease in the degree of arousal is detected, in addition to the map information, the candidate for a break associated with the map information is also presented to the driver. Driving support method.
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