JP2017091138A - Alarm system and saddling vehicle having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alarm system causing a vehicle approaching own vehicle to appropriately pay attention in accordance to surrounding conditions and a saddling vehicle having the same.SOLUTION: An alarm system 1 issues an alarm to an automatic four-wheeled car approaching a motor cycle. The alarm system includes: alarm means 7 for issuing an alarm; vehicle detection means 5 for detecting a distance between the automatic four-wheeled car and the motor cycle and a speed of the automatic four-wheeled car; surrounding condition detection means 4 for detecting surround conditions of the motor cycle: and control means 6 for controlling an operation of the alarm means. The control means determines whether or not the alarm is issued on the basis of the distance between the automatic four-wheeled car and the motor cycle, the speed of the automatic four-wheeled car, and the surrounding conditions detected by the surrounding condition detection means, and controls the alarm means.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an alarm system and a saddle riding type vehicle equipped with the same.

  Conventionally, there has been proposed an alarm system that calls attention to a vehicle approaching the host vehicle when there is a possibility of a collision (see, for example, Patent Documents 1 and 2). In the alarm systems described in Patent Documents 1 and 2, the distance and relative speed between the approaching vehicle and the host vehicle are detected, and when the detected distance or relative speed reaches a predetermined value, an alarm is issued from the host vehicle to the approaching vehicle. Is emitted.

  For example, in Patent Document 1, a vehicle approaching from behind the host vehicle is detected by a camera, and the inter-vehicle distance and relative speed are measured. When these measured values approach the warning area, the vehicle behind the vehicle is alerted by blinking the brake lamp of the host vehicle. In Patent Document 2, a vehicle detection sensor is provided in the host vehicle, and a vehicle approaching the host vehicle is detected by the sensor. When the vehicle is detected, the inter-vehicle distance and the relative speed are measured, and the possibility of the approaching vehicle colliding with the host vehicle is determined based on the measured value. As a result, when there is a possibility of collision, an alarm is issued to the approaching vehicle.

JP 2006-306198 A JP 2012-160103 A

  However, Patent Documents 1 and 2 merely determine whether or not to issue an alarm according to the inter-vehicle distance and relative speed with the approaching vehicle, and alarm control according to the road surface condition and the surrounding environment is not performed, for example.

  The present invention has been made in view of the above points, and provides an alarm system capable of appropriately calling attention to an object approaching the host vehicle according to the surrounding situation, and a straddle-type vehicle including the alarm system. For the purpose.

  An alarm system according to the present invention is an alarm system that issues an alarm to an object approaching the host vehicle, the alarm means for issuing the alarm, the distance between the object and the host vehicle, and the speed of the object. An object detection means for detecting; an ambient condition detection means for detecting an environment surrounding the host vehicle; and a control means for controlling an operation of the alarm means, wherein the control means includes the distance, the speed, and It is determined whether to issue the alarm based on the surrounding situation, and the alarm unit is controlled.

  According to this configuration, it is possible to issue an alarm in consideration of the distance between the host vehicle and a target approaching the host vehicle, the speed of the target, and the surrounding conditions of the host vehicle. As a result, the object approaching the host vehicle can be appropriately alerted according to the surrounding situation, and a collision accident can be prevented.

  Further, in the alarm system according to the present invention, the control means stores a threshold value that is a criterion for determining whether or not to issue the alarm, and based on the ambient condition detected by the ambient condition detection means. It is preferable to set the threshold value and determine whether to issue the alarm based on the distance, the speed, and the threshold value. According to this configuration, the threshold value is set based on the surrounding situation, so that the alarm determination can be appropriately performed according to the surrounding situation.

  Further, in the alarm system according to the present invention, the surrounding state detection unit detects a road surface state, and the control unit sets the threshold based on the road surface state detected by the surrounding state detection unit. It is preferable to do. According to this configuration, the timing for issuing an alarm can be adjusted according to the state of the road surface, for example, when the road surface is dry or when the road surface is wet.

  In the alarm system according to the present invention, the ambient condition detection unit detects brightness of the ambient environment, and the control unit is based on the brightness of the ambient environment detected by the ambient condition detection unit. It is preferable to set the threshold value. According to this configuration, the timing for issuing an alarm can be adjusted according to the brightness of the surrounding environment, for example, when the running time is bright such as daytime or when the running time is dark such as nighttime.

  In the alarm system according to the present invention, it is preferable that the target detection unit detects the target approaching from behind the host vehicle. According to this configuration, it is possible to appropriately call attention to an object approaching from behind the host vehicle.

  In the alarm system according to the present invention, it is preferable that the target is a vehicle, and the control unit sets the threshold based on a size of the vehicle. According to this configuration, it is possible to appropriately alert the vehicle approaching the host vehicle based on the size of the vehicle.

  In the alarm system according to the present invention, the threshold value includes a first threshold value and a second threshold value that is different from the first threshold value, and the control means includes the first threshold value and the second threshold value. It is preferable to determine whether or not to issue an alarm in two stages based on the threshold value. According to this configuration, by determining whether or not to issue an alarm in the second stage, if the target is not noticed by the first-stage alarm, the target can be noticed by the second-stage alarm. For this reason, it is possible to call attention to a subject approaching the host vehicle more reliably.

  In the alarm system according to the present invention, it is preferable that the alarm means emits the alarm by blinking a turn signal lamp. According to this configuration, the existing configuration can be used as an alarm unit, and the configuration is simplified.

  Moreover, it is preferable that the saddle riding type vehicle according to the present invention includes the alarm system described above. According to this configuration, the effect obtained by the above-described alarm system can be enjoyed by the saddle riding type vehicle.

  According to the present invention, it is possible to appropriately call attention to an object approaching the host vehicle according to the surrounding situation.

It is a side view showing an example of the positional relationship between a motorcycle and an automobile. It is a schematic block diagram of the alarm system which concerns on this Embodiment. It is a figure which shows the example by which the alarm system was applied to the motorcycle which concerns on this Embodiment. It is a figure which shows the threshold value map at the time of issuing the warning issuing of the warning system which concerns on this Embodiment. It is a figure which shows the alarm issuing flow of the alarm system which concerns on this Embodiment. It is a figure which shows the alarm issuing flow of the alarm system which concerns on this Embodiment. It is a figure which shows the alarm issuing flow of the alarm system which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, an example in which the alarm system according to the present invention is applied to a motorcycle will be described. However, the application target is not limited to this and can be changed. For example, the alarm system according to the present invention may be applied to other types of vehicles (for example, four-wheeled vehicles, three-wheeled vehicles, and other straddle-type vehicles). In the following drawings, a part of the configuration is omitted for convenience of explanation.

  With reference to FIG.1 and FIG.2, the alarm system which concerns on this Embodiment is demonstrated. FIG. 1 is a side view showing an example of the positional relationship between a motorcycle and an automobile. FIG. 2 is a schematic configuration diagram of the alarm system according to the present embodiment. The motorcycle to which the alarm system is applied is assumed to have a configuration (for example, a vehicle speed sensor) that is normally provided in the motorcycle, and a description thereof will be omitted. In the following description, the host vehicle will be described as a motorcycle, and the following vehicle approaching the host vehicle will be described as a four-wheeled vehicle.

  As shown in FIG. 1, the alarm system 1 (see FIG. 2) according to the present embodiment has a possibility of a collision when the automobile 4 traveling behind the motorcycle 2 approaches more than necessary. Judging from the fact that there is, the motorcycle 2 is configured to call attention to the motorcycle 3.

  Conventionally, a warning is issued by determining the possibility of a collision from the distance and relative speed with an approaching vehicle. However, no consideration was given to the driving conditions in the rain or at night, and the driving characteristics of the vehicle due to the difference in surrounding conditions could not be accommodated. The conventional alarm system is basically applied to a four-wheeled vehicle, and is not intended to prevent a collision in a motorcycle. For example, conventionally, an alarm is issued for an approaching vehicle, while the own vehicle is prepared for a collision of a rear vehicle such as forced lifting of a seat belt or automatic position adjustment of a headrest. . On the other hand, in a motorcycle, there is no configuration for controlling the preparation for collision on the own vehicle side.

  Therefore, the present embodiment not only detects the inter-vehicle distance of the automobile 4 approaching the motorcycle 2 and the speed of the automobile 4 but also considers the road surface condition and the surrounding environment, Is configured to issue an alarm. As a result, it is possible to appropriately alert the following vehicle approaching the host vehicle according to the surrounding situation, and it is possible to prevent a collision accident. In addition to notifying the subsequent vehicle, it is also possible to prompt the driver of the own vehicle to perform avoidance actions such as lane change and acceleration by indicating that the own vehicle has been warned.

  As shown in FIG. 2, the alarm system 1 includes an ambient condition detection unit 4, a vehicle detection unit 5, a control unit 6, and an alarm unit 7. The surrounding situation detection means 4 detects the surrounding situation (especially the rear situation) of the host vehicle (motorcycle 2 (see FIG. 1)). Specifically, the surrounding state detection means 4 includes a rain sensor 40 that detects a road surface condition and a timer 41 that detects time.

  The rain sensor 40 detects rain, and has, for example, a capacitive sensor element. In the rain sensor 40, the capacitance changes when the sensor element gets wet in the rain. The rain sensor 40 detects rain from this change in capacitance. The timer 41 detects the current time. The timer 41 may detect the time of a navigation system having a GPS function, for example. As will be described in detail later, the time detected by the timer 41 is used to determine whether the vehicle is running at daytime or at night. The ambient condition detected by the rain sensor 40 and the timer 41 is output to the control means 6 described later. The ambient conditions shown here indicate the road surface condition based on the weather and the brightness (day or night) of the surrounding environment during travel.

  The vehicle detection means 5 detects approaching vehicles around the host vehicle (particularly rearward). Specifically, the vehicle detection means 5 has a radar 50 constituted by a millimeter wave radar or the like. The radar 50 detects an approaching vehicle by transmitting a millimeter wave to the surroundings and receiving the millimeter wave reflected by the approaching vehicle (automobile 4). Vehicle information detected by the radar 50 is output to the control means 6. Although details will be described later, based on the millimeter wave received by the radar 50, vehicle information such as the inter-vehicle distance from the approaching vehicle, the speed of the approaching vehicle, and the size of the approaching vehicle is detected (calculated).

  The control means 6 controls whether or not to issue an alarm to the approaching vehicle based on the various signals output from the ambient condition detection means 4 and the vehicle detection means 5 described above. The control means 6 is provided in the ECU 21 (Electronic Control Unit: see FIG. 3), and is composed of, for example, a processor that executes various processes, a memory, and the like. The memory is composed of one or a plurality of storage media such as a ROM (Read Only Memory) and a RAM (Random Access Memory) depending on the application.

  Specifically, the control unit 6 includes a storage unit 60, an ambient condition determination unit 61, a calculation unit 62, a threshold setting unit 63, an alarm determination unit 64, and an alarm execution unit 65. The memory | storage part 60 has memorize | stored the threshold value used as the criterion of determination whether the warning is issued with respect to an approaching vehicle. The threshold will be described later. The ambient condition determination unit 61 determines the ambient condition of the motorcycle 2 based on the signal output from the ambient condition detection unit 4. Although the determination method will be described later, the ambient condition determination unit 61 determines the state of the road surface (dry or wet) from the output value of the rain sensor 40, and determines day and night from the output value of the timer 41.

  The calculation unit 62 calculates information on the approaching vehicle (automobile 4) based on the signal output from the vehicle detection means 5. Although details will be described later, the calculation unit 62 calculates the inter-vehicle distance between the motorcycle 2 and the four-wheeled vehicle 3, the speed of the four-wheeled vehicle 3, the size (vehicle size) of the four-wheeled vehicle 3, and the like. . The threshold setting unit 63 selects a suitable threshold from the thresholds stored in the storage unit 60 based on the ambient situation determined by the ambient situation determination unit 61, and sets the threshold as a threshold for alarm determination.

  The alarm determination unit 64 determines whether or not to issue an alarm based on the vehicle information calculated by the calculation unit 62. The alarm execution unit 65 outputs a control signal for issuing an alarm to the alarm unit 7 based on the determination result of the alarm determination unit 64. The warning means 7 issues a warning in response to an instruction from the warning execution unit 65. The alarm means 7 issues an alarm by, for example, lighting or blinking the brake lamp 70 and the turn signal lamp 71 (both see FIG. 3). In this way, the existing configuration can be used as the alarm means 7, and the configuration is simplified. The alarm means 7 is not limited to these, and may generate a sound.

  Next, an application example of the alarm system according to the present embodiment will be described with reference to FIG. FIG. 3 is a diagram showing an example in which the alarm system is applied to the motorcycle according to the present embodiment.

  As shown in FIG. 3, the motorcycle 2 includes an ECU 21 below the seat 20. A rear fender 23 is provided above the rear wheel 22 on the rear side of the vehicle. A brake lamp 70 and a pair of left and right turn signal lamps 71 are provided around the rear fender 23. A radar 50 is provided in the vicinity of the brake lamp 70. Further, a rain sensor 40 is provided inside the rear fender 23 (between the rear wheel 22 and the rear fender 23). Note that these components are not limited to the above-described arrangement examples, and the arrangement locations can be changed as appropriate.

  In particular, by providing the rain sensor 40 on the back side of the rear fender 23, it is possible to detect the rain that is rolled up from the road surface by the rear wheel 22. For this reason, for example, when the road surface is not dry even after raining, it is possible to detect the wet state of the road surface by detecting splashing from the road surface.

  Next, an alarm issuing flow of the alarm system according to the present embodiment will be described with reference to FIGS. FIG. 4 is a diagram showing a threshold map when the alarm is issued by the alarm system according to the present embodiment. FIG. 4A is a table showing threshold values when the road surface is dry, and FIG. 4B is a table showing threshold values when the road surface is wet. 5 to 7 are diagrams showing an alarm issuing flow of the alarm system according to the present embodiment.

  First, a threshold value that is a criterion for determining the warning issuance will be described. As described above, in the present embodiment, the distance between vehicles and the approach speed (relative speed) of the following vehicle approaching the host vehicle are detected, and the road surface condition and the brightness of the surrounding environment are also detected. Based on this, the warning is issued. In addition, the control means 6 (storage unit 60) stores in advance threshold maps M1 and M2 that serve as criteria for determining the above-mentioned alarm issuance for each road surface condition.

  In general, a predetermined distance (stop distance) is required from when the driver determines to perform a sudden braking operation until the vehicle actually stops. Specifically, this stop distance is represented by the sum of the free running distance and the braking distance. The idling distance indicates the distance that the vehicle travels before the brake is operated after the driver determines that the brake is necessary suddenly and the brake actually starts to operate. The braking distance indicates the distance from when the brake is activated until the vehicle actually stops.

  As shown in FIG. 4, in the threshold maps M1 and M2, the stop distance (idle distance + braking distance) corresponding to the traveling speed of the following vehicle (automobile 3 (see FIG. 1)) is the road surface condition (dry). Or wet). In the present embodiment, the threshold is set in two stages by multiplying the braking distance according to the traveling speed of the following vehicle by a predetermined weight. Specifically, a value obtained by multiplying the braking distance by 0.8 as a weight is defined as a first threshold value L1, and a value obtained by multiplying the braking distance by 0.5 as a weight is defined as a second threshold value L2. The weight is not limited to these values and can be changed as appropriate.

  As will be described in detail later, when the distance between the approaching vehicle and the host vehicle is less than the first threshold value L1, the first warning is issued, and the distance between the vehicle and the host vehicle is the second threshold value L2. If it falls below, a second warning is issued. In this way, by issuing an alarm in two stages, if the target is not noticed by the first stage alarm, the target can be noticed by the second stage alarm. For this reason, it is possible to call attention to the approaching vehicle more reliably.

  Further, as shown in FIG. 4B, when the road surface is wet, the braking distance is longer than that during drying, and therefore the first threshold value L1 and the second threshold value L2 are larger than those in FIG. 4A. As a result, when the road surface is wet, an alarm is issued earlier than when dry. Further, although not shown, the first threshold value L1 and the second threshold value L2 can be weighted depending on whether the running time is daytime or nighttime.

  For example, when the vehicle is running during the daytime, 1.0 is added to the threshold values L1 and L2 as a weighting coefficient, and when the vehicle is running at night, 1.1 is added to the threshold values L1 and L2. Multiply. This makes it possible to issue an alarm earlier when traveling at night, when visibility is inferior to that of daytime. In addition, when the following vehicle is a large vehicle, there is a possibility that damage caused by a collision will increase. For this reason, it is also possible to weight the first threshold value L1 and the second threshold value L2 based on the size of the vehicle detected by the vehicle detection means 5 (see FIG. 2).

  For example, when the following vehicle is a large vehicle, the weighting coefficient is multiplied by 1.1 to each of the threshold values L1 and L2, and when the succeeding vehicle is not a large vehicle (such as a normal vehicle or a small vehicle), the weighting coefficient is used. Is multiplied by 1.0 to each of the threshold values L1 and L2. Thereby, the alarm determination according to a vehicle case can be performed.

  The weighting coefficients described above are merely examples, and can be changed as appropriate. In other words, it is preferable to increase the weighting coefficient as the surrounding situation deteriorates. As a result, when the driving environment is not very favorable, it is possible to issue an alarm early. In addition to the road surface condition, the brightness during travel, and the size of the following vehicle, parameters that serve as a criterion for alarm determination may be set as surrounding conditions.

  Next, specific alarm determination control will be described. As shown in FIG. 5, when the control is started, first, the radar 50 (see FIG. 2) detects whether the automobile 4 (following vehicle) exists behind the motorcycle 2 (see FIG. 1). (Step ST101). When there is no following vehicle (step ST101: NO), the control is finished. Note that the end of the control means that the control ends without issuing an alarm, and the same applies to the following.

  When the following vehicle exists (step ST101: YES), the surrounding situation and the vehicle type of the following vehicle are determined (steps ST102 to 104). Specifically, the surrounding state determination unit 61 determines the state (dry or wet) of the road surface based on the output from the rain sensor 40 (see FIG. 2) (step ST102). Moreover, the surrounding state determination part 61 determines day and night from the output value of the timer 41 (refer FIG. 2) (step ST103). For example, the determination of day and night is performed based on the sunrise or sunset time during travel.

  Furthermore, the calculation unit 62 calculates the vehicle width and the like of the following vehicle based on the output from the radar 50, and determines the vehicle grade (step ST104). For example, when the vehicle width of the following vehicle is 2.5 m or more, the vehicle grade is determined as a large vehicle. When the vehicle width is 1.48 m or more and less than 2.5 m, the vehicle case is determined to be a light vehicle or a normal vehicle. Furthermore, if the vehicle width is less than 1.48 m or cannot be detected, the vehicle case is determined to be a two-wheeled vehicle.

  Next, a threshold map serving as a criterion for determining whether or not to issue an alarm is selected based on the above-described surrounding situation and the determination result of the vehicle grade of the following vehicle (step ST105). Specifically, first, one of the threshold maps M1 and M2 (see FIG. 4) is selected by the threshold setting unit 63 (see FIG. 2) from the road surface state determined by the surrounding state determination unit 61. When the road surface is dry, the threshold map M1 is selected, and when the road surface is wet, the threshold map M2 is selected from the storage unit 60 (see FIG. 2).

  Next, the threshold setting unit 63 determines each threshold of the threshold map M1 (or M2) based on the day / night determination result determined by the surrounding state determination unit 61 and the determination result of the vehicle case determined by the calculation unit 62. Multiply L1 and L2 by a weighting coefficient. As shown in FIG. 6, there are a total of 12 patterns of threshold combinations based on the determination result, 2 patterns in the road surface state, 2 patterns in the surrounding brightness, and 3 patterns in the vehicle size of the following vehicle. In FIG. 6, a dry road surface is denoted as DRY, and a wet road surface is denoted as WET. The threshold map when the road surface is dry is denoted as M1, and the threshold map when the road surface is wet is denoted as M2. Further, the threshold weighting coefficient based on the surrounding brightness will be described as W1, and the threshold weighting coefficient based on the vehicle grade of the following vehicle will be described as W2.

  As described above, the threshold value map M1 is selected when the road surface is dry. At this time, if the running time is daytime and the following vehicle is a motorcycle, the threshold value is not set as the pattern P1, and the alarm control is terminated. When the succeeding vehicle is a motorcycle, the driver on the side of the rear-end collision (subsequent side) is considered to be seriously damaged, and therefore determines that no rear-end collision occurs even when approaching. When the threshold map M1 is selected and the driving time is daytime and the following vehicle is a normal vehicle or the like, the weighting coefficient is set to W1 = 1.0 and W2 = 1.0 as the pattern P2. When the threshold map M1 is selected and the driving time is daytime and the following vehicle is a large vehicle, the weighting coefficient is set to W1 = 1.0 and W2 = 1.1 as the pattern P3.

  When the threshold map M1 is selected, the driving time is night, and the following vehicle is a motorcycle, no threshold is set as the pattern P4, and the alarm control ends. When the threshold map M1 is selected and the driving time is night and the following vehicle is a normal vehicle or the like, the weighting coefficients are set as W1 = 1.1 and W2 = 1.0 as the pattern P5. When the threshold map M1 is selected and the driving time is night and the following vehicle is a large vehicle, the weighting coefficients are set to W1 = 1.1 and W2 = 1.1 as the pattern P6.

  Further, when the road surface is wet, the threshold map M2 is selected. At this time, if the running time is daytime and the following vehicle is a motorcycle, the threshold value is not set as the pattern P7, and the alarm control is terminated. When the threshold map M2 is selected and the driving time is daytime and the following vehicle is a normal vehicle or the like, the weighting coefficients are set as W1 = 1.0 and W2 = 1.0 as the pattern P8. When the threshold map M2 is selected and the driving time is daytime and the following vehicle is a large vehicle, the weighting coefficient is set to W1 = 1.0 and W2 = 1.1 as the pattern P9.

  When the threshold map M2 is selected, the driving time is night, and the following vehicle is a motorcycle, no threshold is set as the pattern P10, and the alarm control ends. When the threshold map M2 is selected and the driving time is night and the following vehicle is a normal vehicle or the like, the weighting coefficients are set to W1 = 1.1 and W2 = 1.0 as the pattern P11. When the threshold map M2 is selected and the driving time is night and the following vehicle is a large vehicle, the weighting coefficients are set to W1 = 1.1 and W2 = 1.1 as the pattern P12. As described above, a threshold map is selected according to each determination result, a weighting coefficient is set, and each threshold L1, L2 of the threshold map is multiplied by W1, W2. Thereby, a threshold value for alarm determination is set (step ST106).

  Next, as shown in FIG. 7, the speed and distance between the following vehicles are calculated (step 201). Specifically, the calculation unit 62 calculates the inter-vehicle distance between the host vehicle and the following vehicle and the speed of the following vehicle based on the output from the radar 50.

  Next, whether or not the calculated inter-vehicle distance is equal to or less than the first threshold L1 is determined by the alarm determination unit 64 (step ST202). When the inter-vehicle distance is greater than the first threshold L1 (step ST202: NO), the alarm control ends. On the other hand, when the inter-vehicle distance is equal to or less than the first threshold L1 (step ST202: YES), a first warning is issued (step ST203). Specifically, the alarm execution unit 65 outputs a control signal for issuing an alarm to the alarm means 7, and the alarm means 7 is activated. As a result, the left and right turn signal lamps 71 (see FIG. 3) flash, and attention is urged to the following vehicle.

  After the first alarm, the control unit 6 (see FIG. 2) receives the signal from the radar 50 again, and the inter-vehicle distance is newly calculated by the calculation unit 62. Then, whether or not the new inter-vehicle distance is equal to or smaller than the second threshold L2 is determined by the alarm determination unit 64 (step ST204). When the inter-vehicle distance is greater than the second threshold L2 (step ST204: NO), the process returns to step ST201. When the inter-vehicle distance is equal to or less than the second threshold L2 (step ST204: YES), a second warning is issued (step ST205). Specifically, the turn signal lamp 71 stops blinking and the brake lamp 70 (see FIG. 3) blinks anew. Thereby, attention is urged to the following vehicle again.

  Then, the presence or absence of the following vehicle is detected again (step ST206). For example, it is determined whether the following vehicle has changed lanes or whether the following vehicle has changed to another vehicle. The method for detecting the following vehicle is the same as in step ST101. When there is a succeeding vehicle (step ST206: YES), the process returns to step ST201. On the other hand, when there is no following vehicle, or when the following vehicle changes lanes and the following vehicle changes to another vehicle (step ST206: NO), the alarm control ends.

  As described above, in the first alarm, the turn signal lamp 71 is blinked, and in the second alarm, the brake lamp 70 is blinked (pumping brake). it can. In particular, the turn signal lamp 71 can be caused to blink when the host vehicle changes lanes to avoid a collision by blinking the brake lamp 70 with the second alarm.

  That is, the warning signal and the lane change signal can be simultaneously performed by blinking the turn signal lamp 71 while issuing an alarm with the brake lamp 70. This not only informs that the following vehicle is too close to the host vehicle but also informs the intention of changing the lane. In addition, not only the following vehicle traveling in the same lane, but also the vehicle traveling in the adjacent lane can be transmitted to the intention of changing the lane.

  As described above, according to the present embodiment, the distance between the host vehicle (motorcycle 2) and the target approaching the host vehicle (automobile 4), the target speed, and the surrounding conditions of the host vehicle are determined. An alarm can be issued in consideration. As a result, it is possible to appropriately call attention to an object approaching the host vehicle according to the surrounding situation. For example, it is possible to prevent a collision accident by encouraging the driver of the following vehicle to increase the inter-vehicle distance.

  Further, by detecting the road surface condition and the brightness of the surrounding environment, depending on the road surface state, for example, when the road surface is dry or when the road surface is wet, the brightness of the surrounding environment, For example, the timing for issuing an alarm can be adjusted according to the case where the driving time is bright such as daytime or the nighttime when driving is dark. Further, by detecting the size of the following vehicle, it is possible to appropriately alert the vehicle approaching the host vehicle based on the size of the vehicle.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above-described embodiment, the motorcycle 2 has been described as an example of the own vehicle, but is not limited to this configuration. The own vehicle may be another type of vehicle such as an automatic four-wheeled vehicle, an automatic three-wheeled vehicle, or a straddle-type four-wheel buggy.

  In the embodiment described above, the four-wheeled vehicle 3 has been described as an example of an object that approaches the host vehicle, but is not limited to this configuration. The target approaching the host vehicle may be other than a vehicle such as a bicycle.

  Moreover, although the above-mentioned embodiment demonstrated the case where a vehicle approached from the back with respect to the own vehicle, it is not limited to this structure. For example, the present invention can also be applied when the target approaches from the side or front of the host vehicle. In this case, it is preferable to change the position of the alarm means 7 as appropriate.

  Further, in the above-described embodiment, the turn signal lamp 71 and the brake lamp 70 are used as the alarm means 7 and the alarm is generated by blinking them. However, the present invention is not limited to this configuration. The turn signal lamp 71 and the brake lamp 70 may be turned on, or another lamp may be provided. Moreover, you may use the structure which emits sound, such as not only a lamp but a horn. By generating the sound, it is possible to call attention when the driver of the approaching vehicle is dozing.

  Further, in the above-described embodiment, the configuration that calls attention to the following vehicle is described as an example, but the configuration is not limited to this configuration. For example, when an alarm is issued to the following vehicle, the warning indication is displayed on the speedometer 24 (see FIG. 1) of the own vehicle, so that the driver of the own vehicle can perform avoidance actions such as lane change and acceleration. Can be urged.

  Further, in the above-described embodiment, as the surrounding situation detected by the surrounding situation detection unit 4, the road surface state and the brightness of the traveling environment have been described as examples. However, the present invention is not limited to this configuration. For example, an approaching vehicle may be imaged with an in-vehicle camera, and a history of driving characteristics of the approaching vehicle may be stored. For example, when an approaching vehicle is meandering such as a snooze driving, it is possible to urge the approaching vehicle to increase the inter-vehicle distance by issuing an alarm from the history of driving characteristics, while for the own vehicle, It can encourage avoidance behavior.

  In the above-described embodiment, the rain sensor 40 detects rain and determines the road surface state. However, the present invention is not limited to this configuration. For example, it is good also as a structure which detects snow, sand, etc. and determines a road surface state.

  In the above-described embodiment, the brightness of the surrounding environment is detected from the time indicated by the timer 41. However, the present invention is not limited to this configuration. For example, the brightness of the surrounding environment may be detected by an optical sensor.

  In the above-described embodiment, the radar 50 is used as the vehicle detection means 5, but the present invention is not limited to this configuration. For example, the vehicle detection means 5 may be configured to detect a vehicle with an in-vehicle camera.

  Further, in the above-described embodiment, when the vehicle width of the following vehicle is 2.5 m or more, the vehicle case is determined as a large vehicle, and when the vehicle width is 1.48 m or more and less than 2.5 m, the vehicle is If the case is determined to be a light vehicle or a normal vehicle, and the vehicle width is less than 1.48 m or cannot be detected, the vehicle case is determined to be a motorcycle. However, it is not limited to this configuration. The determination of the vehicle case can be changed as appropriate, and the classification of the vehicle case may be determined according to the standard of the country to which the alarm system 1 is applied.

  In the above-described embodiment, the alarm control is terminated when the succeeding vehicle is determined to be a two-wheeled vehicle. However, the present invention is not limited to this configuration. Even when the subsequent vehicle is determined to be a two-wheeled vehicle, a threshold may be set and an alarm may be issued in the same manner as a normal vehicle or the like.

  As described above, the present invention has an effect of being able to appropriately call attention to an approaching vehicle according to the surrounding situation, and is particularly useful for a warning system and a saddle-type vehicle equipped with the same. is there.

1 Warning system 2 Motorcycle (own vehicle)
3 Automobiles (objects approaching)
4 Ambient condition detection means 40 Rain sensitive sensor 41 Timer 5 Vehicle detection means (target detection means)
50 Radar 6 Control means 7 Alarm means L1 First threshold (threshold)
L2 Second threshold (threshold)

Claims (9)

An alarm system for issuing an alarm to an object approaching the host vehicle,
An alarm means for issuing the alarm;
Object detection means for detecting the distance between the object and the host vehicle, and the speed of the object;
Ambient condition detection means for detecting a situation around the host vehicle,
Control means for controlling the operation of the alarm means,
The control unit determines whether to issue the alarm based on the distance, the speed, and the surrounding situation, and controls the alarm unit.   The control means stores a threshold value that is a criterion for determining whether or not to issue the alarm, sets the threshold value based on the ambient condition detected by the ambient condition detection means, and sets the distance, the speed The alarm system according to claim 1, wherein whether or not to issue the alarm is determined based on the threshold value. The ambient condition detection means detects a road surface state,
The alarm system according to claim 2, wherein the control unit sets the threshold based on the road surface state detected by the surrounding state detection unit. The ambient condition detection means detects the brightness of the surrounding environment,
4. The alarm system according to claim 2, wherein the control unit sets the threshold based on brightness of the surrounding environment detected by the ambient state detection unit. 5.   The alarm system according to any one of claims 2 to 4, wherein the target detection unit detects the target approaching from behind the host vehicle. The object is a vehicle;
6. The alarm system according to claim 2, wherein the control unit sets the threshold based on a size of the vehicle. The threshold value includes a first threshold value and a second threshold value different from the first threshold value,
The alarm system according to any one of claims 2 to 6, wherein the control means determines whether or not to issue an alarm in two stages based on the first threshold value and the second threshold value.   8. The alarm system according to claim 2, wherein the alarm means issues the alarm by blinking a turn signal lamp.   A straddle-type vehicle comprising the alarm system according to any one of claims 2 to 8.

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