JP2007050735A - Vehicle fire alarming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle fire alarming device comparatively easy to mount. <P>SOLUTION: The vehicle fire alarming device is equipped with an infrared camera 14 mounted on a side mirror 13 of a vehicle in such an arrangement as able to photograph the side of the vehicle including the surrounding part of each rear wheel 16 and capable of emitting the image of the object photographed as a density signal complying with the temperature of the object photographed, a rear wheel temperature presuming means 18 to presume either or both of the first temperature of the rear wheel 16 and the second temperature of the area surrounding the rear wheel from the light intensity image signal of the infrared camera, and a first alarming means 21 to emit an alarm when either or both of the first and second temperatures presumed by the temperature presuming means has/have exceeded the prescribed threshold. The arrangement may also be equipped with a front wheel temperature presuming means to presume either or both of the third temperature of each front wheel 17 and the fourth temperature of the area surrounding the front wheel in conformity to the density signal of the infrared camera and a second alarming means 22 to emit an alarm when either or both of the third and fourth temperatures presumed by the front wheel temperature presuming means has/have exceeded the prescribed threshold. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle fire alarm device that issues an alarm by detecting heat generation in the vicinity of a vehicle wheel.

  Conventionally, a vehicle is provided with a brake device for reducing the traveling speed. When the vehicle is braked and stopped by the brake device, the kinetic energy that the vehicle has traveled is converted into heat energy, and heat is generated in the brake device that brakes the vehicle. In particular, when the vehicle is a truck, its weight is relatively large, and the kinetic energy resulting from its running is relatively large. For this reason, the thermal energy generated when the vehicle is braked and stopped is excessive, and it is necessary to effectively detect the heat generation and effectively prevent the vehicle fire caused by the excessive heat generation.

In addition to the flake device, tire flank due to tire pressure shortage due to insufficient tire air pressure and double tire contact due to double wheel contact can be cited as fire factors, and it is necessary to prevent vehicle fires caused by these tire heat generation.
Here, an infrared sensor is generally known as a device that detects a heat source. The infrared sensor is used to detect a heat source outside the vehicle, and an alarm is issued when a heat source is generated by the detection output. A sensing device that has been proposed has been proposed (see, for example, Patent Document 1). Therefore, it is conceivable to apply this device to a vehicle, detect heat generated in the vicinity of the brake device and the tire by an infrared sensor, and issue an alarm when abnormal heat generation is detected.
Japanese Patent Laid-Open No. 11-348695 (Claims and specification [0017])

However, if an infrared sensor is used to detect heat generated in the vicinity of the brake device, the sensor needs to be provided in the vicinity of the brake device. When the alarm means is provided inside the cab, a wire harness that connects the sensor and the alarm means is provided. There was a problem that the wiring had to be carried out over a relatively long distance, which limited the degree of freedom of design and increased the number of parts and the number of work steps.
Further, as a method of directly detecting the heat generation of the tire, a method of wireless transmission in which an infrared sensor is incorporated in each tire can be considered, but this also increases the number of parts and the number of work steps.
An object of the present invention is to provide a vehicle fire alarm device that can be mounted relatively easily.

  The invention according to claim 1, as shown in FIGS. 1 to 3, the object to be photographed provided on the side mirror 13 of the vehicle 10 so as to be able to photograph the side portion of the vehicle 10 including the periphery of the rear wheel 16 of the vehicle 10. In the one or both of the infrared camera 14 capable of outputting as a gray image signal corresponding to the temperature of the object to be photographed and the portion A corresponding to the rear wheel of the infrared camera 14 or the portion B corresponding to the periphery of the rear wheel. Rear wheel temperature estimating means 18 for estimating one or both of the first temperature of the rear wheel 16 and the second temperature around the rear wheel 16 from the video signal, and the first temperature or the first temperature estimated by the temperature estimating means 18. A vehicle fire alarm device comprising: a first alarm means 21 that issues an alarm when one or both of a value corresponding to one temperature, a second temperature, or a value corresponding to a second temperature exceeds a predetermined threshold is there.

In the vehicle fire alarm device according to the first aspect, since the infrared camera 14 is provided on the side mirror 13 of the vehicle 10, the distance from the first alarm means 21 provided in the cab 11 is determined by the sensor for braking the rear wheel. The wire harness connecting the infrared camera 14 and the first alarm means 21 can be shortened as compared with the case where it is provided in the vicinity of the apparatus. For this reason, the degree of freedom of design is increased as compared with the case where the sensor is provided in the vicinity of the brake device in the rear wheel, and the number of parts and the man-hours for wiring the wire harness are reduced. Can be attached to.
On the other hand, the temperature estimating means 18 estimates the first temperature of the rear wheel 16 or the second temperature around the rear wheel 16 from the grayscale image according to the temperature of the object photographed by the infrared camera 14, so that it is excessive from the brake device. Therefore, the alarm means 21 issues an alarm when they exceed a predetermined threshold value, so that the driver can be effectively informed of the abnormal heat generation.

The invention according to claim 2 is the invention according to claim 1, wherein the first alarm means 21 is the first temperature estimated by the temperature estimation means 18 or a value corresponding to the first temperature, or the second temperature or the second temperature. One of or both of the values corresponding to two temperatures exceed a predetermined threshold value, and an alarm is generated when the vehicle 10 exceeds a predetermined speed.
In the vehicle fire alarm device described in claim 2, when the vehicle 10 is traveling at a speed at which it is difficult to stop the vehicle, it is effective for the driver when the rear wheel 16 or the periphery of the rear wheel 16 is abnormally heated. I can let you know.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the first alarm means 21 is the first temperature estimated by the temperature estimation means 18 or a value corresponding to the first temperature or the second temperature. Alternatively, the present invention is characterized in that an alarm is issued when a state in which one or both of the values corresponding to the second temperature exceed a predetermined threshold continues for a predetermined time.
In the vehicle fire alarm device according to claim 3, one or both of the first temperature, the value corresponding to the first temperature, the value corresponding to the second temperature or the second temperature, or both are instantaneously less than a predetermined time. It is possible to prevent an alarm from being issued in a state where a predetermined threshold value is exceeded.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the rear wheel temperature estimating means 18 corresponds to the portion A corresponding to the rear wheel of the infrared camera 14 and the periphery of the rear wheel. It is configured to estimate both the first temperature of the rear wheel 16 and the second temperature around the rear wheel 16 from the grayscale video signals in both portions B, and the first alarm means 21 is estimated by the temperature estimation means 18. A brake overheat alarm is issued when the first temperature exceeds a predetermined first threshold, and a fire alarm is generated when the second temperature estimated by the temperature estimating means 18 exceeds a predetermined second threshold. It is characterized by that.
In the vehicle fire alarm device described in claim 4, a fire has not yet occurred, but if the state is left as it is, a warning to the fact that the brake device has overheated to a state where there is a high possibility of a fire, and a fire has already occurred. It is possible to issue a warning for the fired state and both a warning for preventing fire spread caused by the occurrence of fire.

The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the left and right side mirrors 13 of the vehicle 10 are respectively provided with infrared cameras 14, and the rear wheel temperature estimating means 18 is One or both of a first temperature of each of the left and right rear wheels 16 and a second temperature of each of the surroundings of the left and right rear wheels 16 are estimated from the grayscale video signals of the infrared cameras 14 provided on the side mirrors 13 respectively. The first alarm means 21 is configured so that the first temperature difference between the left and right rear wheels 16 estimated by the temperature estimating means 18 or the difference between the values corresponding to the first temperature, or the left and right rear wheels 16 are respectively determined. The second temperature difference or the value difference corresponding to the second temperature, or both of them, when a predetermined value is exceeded for a predetermined time, is configured to issue an alarm.
In the vehicle fire alarm device according to the fifth aspect, when variations occur in the respective brake devices in the left and right rear wheels 16, an alarm can be issued from the difference in the amount of heat generated due to the variations. It is possible to effectively inform the driver of the abnormality related to the variation.

The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the infrared camera 14 is configured so that the periphery of the front wheel 17 of the vehicle 10 is included in the side portion of the vehicle 10 to be photographed. The third temperature of the front wheel 17 and the third temperature around the front wheel 17 are obtained from the grayscale image signal in either or both of the part C corresponding to the front wheel of the infrared camera 14 and the part D corresponding to the periphery of the front wheel. The front wheel temperature estimating means 18 for estimating one or both of the four temperatures, and the temperature of one or both of the third temperature and the fourth temperature estimated by the front wheel temperature estimating means 18 exceeds a predetermined threshold value. And a second alarm means 22 for issuing an alarm when the alarm is issued.
In the vehicle fire alarm device according to the sixth aspect, excessive heat generation from the brake device in the front wheel 17 can be detected effectively, and the second alarm means 22 is activated when it exceeds a predetermined threshold value. Since the alarm is issued, it is possible to effectively notify the driver of abnormal heat generation of the brake device at the front wheel 17.

The invention according to claim 7 is the invention according to claim 6, wherein the second alarm means 22 is the third temperature estimated by the temperature estimation means 18 or a value corresponding to the third temperature, or the fourth temperature or the second temperature. It is characterized in that an alarm is issued when either or both of the values corresponding to the four temperatures exceed a predetermined threshold and the vehicle 10 exceeds a predetermined speed.
In the vehicle fire alarm device according to the seventh aspect, when the vehicle 10 is traveling at a speed at which it is difficult to stop the vehicle, the driver is effectively notified when the front wheels 17 or the front wheels 17 are abnormally heated. be able to.

The invention according to claim 8 is the invention according to claim 6 or 7, wherein the second alarm means 22 is the third temperature estimated by the temperature estimation means 18 or a value corresponding to the third temperature or the fourth temperature. Alternatively, the present invention is characterized in that an alarm is generated when a state in which one or both of the values corresponding to the fourth temperature exceed a predetermined threshold continues for a predetermined time.
In the vehicle fire alarm device according to the eighth aspect, one or both of the third temperature, the value corresponding to the third temperature, the value corresponding to the fourth temperature or the fourth temperature, or both are instantaneously less than a predetermined time. It is possible to prevent an alarm from being issued in a state where a predetermined threshold value is exceeded.

The invention according to claim 9 is the invention according to any one of claims 6 to 8, wherein the front wheel temperature estimating means 18 is a part C corresponding to the front wheel of the infrared camera 14 or a part D corresponding to the periphery of the front wheel. Both the temperature of the third temperature of the front wheel 17 and the temperature of the fourth temperature around the front wheel 17 are estimated from the grayscale video signals in both, and the second alarm means 22 is the third temperature estimated by the front wheel temperature estimating means 18. A brake overheat warning is issued when the temperature exceeds a predetermined first threshold, and a fire warning is generated when the fourth temperature estimated by the front wheel temperature estimating means 18 exceeds a predetermined second threshold. It is characterized by.
In the vehicle fire alarm device described in claim 9, the fire has not yet been reached, but if the state is left as it is, there is an alarm for the fact that the brake device has overheated to a state where there is a high possibility of a fire, and the fire has already occurred. It is possible to issue a warning for the fired state and both a warning for preventing fire spread caused by the occurrence of fire.

The invention according to claim 10 is the invention according to any one of claims 1 to 4, wherein the left and right side mirrors 13 of the vehicle 10 are provided with infrared cameras 14, respectively, and the front wheel temperature estimating means 18 is provided on the left and right sides. One or both of a third temperature of each of the left and right front wheels 17 and a fourth temperature of each of the surroundings of the left and right front wheels 17 are estimated from the grayscale video signals of the infrared cameras 14 provided on the mirrors 13 respectively. The second alarm means 22 is configured to detect the difference between the third temperatures of the left and right front wheels 17 estimated by the front wheel temperature estimation means 18 or the difference between the values corresponding to the third temperature, or the fourth temperature of each of the left and right front wheels 17. And / or a difference in value corresponding to the fourth temperature is configured to issue an alarm even when one or both of them exceed a predetermined value for a predetermined time. That.
In the vehicle fire alarm device described in claim 10, when variations occur in the respective brake devices in the left and right front wheels 17, an alarm can be issued from the difference in the amount of heat generated due to the variations. It is possible to effectively inform the driver of the abnormality related to the variation.

  In the vehicle fire alarm device of the present invention, since the infrared camera is provided on the side mirror of the vehicle, the distance from the first alarm means provided in the cab is compared with the case where the sensor is provided in the vicinity of the brake device in the rear wheel. This shortens the wire harness connecting the infrared camera and the first alarm means. For this reason, the degree of freedom of design increases as compared with the case where the sensor is provided in the vicinity of the brake device in the rear wheel, and the number of parts and the work man-hour for routing the wire harness can be reduced. On the other hand, the temperature estimation means estimates the first temperature of the rear wheel or the second temperature around the rear wheel from the grayscale image according to the temperature of the object photographed by the infrared camera, so that excessive heat is generated from the brake device and the tire. Can be detected effectively, and the alarm means issues an alarm when they exceed a predetermined threshold value, so that the driver can be effectively informed of the abnormal heat generation.

In this case, the rear wheel temperature estimating means is configured to estimate both the first temperature of the rear wheel and the second temperature around the rear wheel from the gray image signal in the infrared camera, and the first alarm means is the first alarm means. If it is configured to issue a brake overheat alarm when the temperature exceeds a predetermined first threshold and issue a fire alarm when the second temperature exceeds a predetermined second threshold, a fire has not yet occurred. After that, both a warning for the fact that the brake system has overheated to a state where there is a high possibility of a fire and a warning for the situation where a fire has already occurred to prevent the spread of fire due to the occurrence of the fire are staged. be able to.
In addition, an infrared camera is provided on the side mirror of the vehicle so that the side of the vehicle to be photographed includes the periphery of the front wheel, and either the third temperature of the front wheel or the fourth temperature around the front wheel is determined from the gray image signal of the infrared camera. Front wheel temperature estimating means for estimating one or both temperatures, and second alarm means for issuing an alarm when one or both of the third temperature and the fourth temperature exceed a predetermined threshold. If it is provided, it is possible to effectively detect excessive heat generation from the brake device at the front wheels, and it is possible to effectively notify the driver of abnormal heat generation of the brake device at the front wheels.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 5, a truck 10 that is a vehicle includes a cab 11 on which a driver gets on and a loading platform 12 that is provided behind the cab 11 and loads a load. Side mirrors 13 and 13 are provided on the left and right sides of the cab 11 for the driver to confirm the rear. As shown in FIG. 3, the side mirrors 13 and 13 in this embodiment include an end plate (not shown), a cover body 13b that covers the end panel from the front, and a stay 13c that fixes the end panel together with the cover body 13b to the cab 11. Is provided. The side mirrors 13 and 13 are provided with infrared cameras 14 and 14, respectively. Although the infrared cameras 14 and 14 in this embodiment are attached to the stay 13c below the cover body 13b adjacent to the cover body 13b, the infrared cameras 14 and 14 are provided inside the cover body 13b. May be.

  As shown in FIGS. 2 and 5, the infrared cameras 14 and 14 are arranged not only on the side of the track 10 including the periphery of the rear wheel 16 of the track 10 but also on the side of the track 10 to be photographed around the front wheel 17 of the track 10. Are also provided on the side mirrors 13 and 13 of the track 10 so as to be included. That is, the infrared camera 14 provided on the side mirror 13 on the right side of the cab 11 is provided so as to be able to photograph both the front and rear wheels 16 and 17 on the right side of the track 10, and the infrared camera 14 provided on the side mirror 13 on the left side of the cab 11. Is provided so that both the front and rear wheels 16 and 17 on the left side of the track 10 can be photographed. Each of the infrared cameras 14 and 14 is configured to be able to output the right and left portions of the track 10 that is the photographed object as a gray image signal corresponding to the temperature.

  As shown in FIGS. 1 and 5, the detection outputs of the infrared cameras 14, 14 provided on the left and right side mirrors 13, 13 are connected to a controller 18, which is a temperature estimation means, via a wire harness, and are connected to the controller 18. Includes a memory 18a and a timer 18b. A detection output of a vehicle speed sensor 20 that detects the speed of the truck 10 is connected to the controller 18, and a display 19 that displays images taken by the infrared cameras 14 and 14 is provided inside the cab 11. The display 19 is connected to the control output of the controller 18, and the controller 18 is configured to display on the display 19 the image captured by the infrared cameras 14 and 14 as a gray image corresponding to the temperature. An image displayed on the display 19 is shown in FIG. The controller 18 receives the rear wheel from the grayscale video signals in both the portion A corresponding to the rear wheel 16 and the portion B corresponding to the periphery of the rear wheel 16 taken by the infrared cameras 14 and 14 shown in FIG. It is configured to estimate both the first temperature of 16 and the second temperature around the rear wheel 16. Further, the controller 18 in this embodiment is configured to detect the front wheel 17 from the grayscale video signals in both the portion C corresponding to the front wheel 17 of the track 10 taken by the infrared cameras 14 and 14 and the portion D corresponding to the periphery of the front wheel 17. Both the third temperature and the fourth temperature around the front wheel 17 can be estimated.

  The controller 18 is connected to first and second alarm means 21 and 22. The first alarm means 21 has one or both of the first temperature and the second temperature estimated by the controller 18 that is the temperature estimation means, and the speed of the truck 10 detected by the vehicle speed sensor 20 exceeds a predetermined speed. When a state in which the predetermined temperature exceeds a predetermined threshold continues for a predetermined time measured by the timer 18b, an alarm is issued. As shown in FIG. 4, a state in which the first temperature exceeds the predetermined first threshold is detected. When a predetermined time measured by the timer 18b continues, a brake overheat alarm is issued, and a state in which the second temperature estimated by the temperature estimating means exceeds a predetermined second threshold continues for a predetermined time measured by the timer 18b. Configured to issue a fire alarm when Here, the brake overheat alarm in this embodiment is a chime emitted from a speaker (not shown), and the fire alarm is a ringing sound by a buzzer (not shown) because it is necessary to surely inform the driver of the fact.

  The first threshold value is a value corresponding to the tire surface temperature when the brake lining surface is 300 ° C., and the second threshold value is a value corresponding to the tire ambient temperature when the tire surface is 300 ° C. It is stored in the memory 18a (FIG. 1). This is because when the first temperature indicating the temperature of the rear wheel 16 exceeds the first threshold, a fire has not yet occurred, but an alarm can be issued for the fact that the brake is overheated to a state where there is a high possibility of a fire thereafter. Because. Further, if the second temperature indicating the temperature around the rear wheel 16 exceeds the second threshold value, it indicates a state in which a fire has occurred, and an alarm for preventing the spread of fire due to the occurrence of the fire can be issued. . The value corresponding to the temperature indicates a value obtained by calculating the luminance and area of the image obtained from the infrared cameras 14 and 14. For example, the average luminance or the area value above a certain luminance. In addition, since the tire and brake loads differ depending on the vehicle's shaft arrangement, shared load, etc., it is necessary to use values according to the vehicle to be applied.

  The second alarm means 22 has either the third temperature or the fourth temperature estimated by the controller 18 that is the front wheel temperature estimating means when the speed of the truck 10 detected by the vehicle speed sensor 20 exceeds a predetermined speed, or An alarm is issued when a state in which both temperatures exceed a predetermined threshold continues for a predetermined time measured by the timer 18b, and a state in which the third temperature exceeds a predetermined third threshold is measured by the timer 18b. The brake overheat alarm is issued when the predetermined time continues, and a fire occurs when the state in which the fourth temperature estimated by the temperature estimating means exceeds the predetermined fourth threshold continues for the predetermined time measured by the timer 18b. Configured to issue an alarm. Here, the brake overheat alarm in this embodiment is a chime emitted from a speaker (not shown), and the fire alarm is ringing by a buzzer (not shown), and is stored in the memory 18a in the controller 18. The third threshold value is a value corresponding to the tire surface temperature when the brake lining surface is 300 ° C., and the fourth threshold value is a value corresponding to the tire ambient temperature when the tire surface is 300 ° C. This is because when the third temperature indicating the temperature of the front wheel 17 exceeds the third threshold, a fire has not yet been reached, but a warning can be issued for the fact that the brake is overheated to a state where there is a high possibility of a fire after that. is there. Further, when the fourth temperature indicating the temperature around the front wheel 17 exceeds the fourth threshold value, it represents a state where a fire has occurred, and an alarm for preventing the spread of fire due to the occurrence of the fire can be issued.

  In the above-described embodiment, a chime emitted from a speaker (not shown) has been described as a brake overheat alarm. However, the flake overheat alarm is a lighting or blinking of a warning lamp (not shown) or a display on the display 19. Such an alarm may be used. On the other hand, since it is necessary for the driver to be sure of the fact, the fire alarm may be an alarm such as a vibration of the seat (not shown) or a tightening of the seat belt in addition to the ringing by the buzzer 24.

  In the vehicle fire alarm device configured as described above, since the infrared camera 14 is provided on the side mirror 13 of the truck 10, the distance from the first alarm means 21 provided in the cab 11 is the same as that of the brake device for the rear wheel. The wire harness connecting the infrared camera 14 and the first alarm means 21 can be shortened as compared with the case where it is provided in the vicinity. For this reason, the degree of freedom of design increases as compared with the case where the sensor is provided in the vicinity of the brake device in the rear wheel, and the number of parts and the work man-hour for routing the wire harness can be reduced.

  On the other hand, the temperature estimating means 18 estimates the first temperature of the rear wheel 16 or the second temperature around the rear wheel 16 from the grayscale image according to the temperature of the object photographed by the infrared camera 14, so that it is excessive from the brake device. Therefore, the alarm means 21 issues an alarm when they exceed a predetermined threshold value, so that the driver can be effectively informed of the abnormal heat generation. In particular, the rear wheel temperature estimating means 18 is configured to estimate both the first temperature of the rear wheel 16 and the second temperature around the rear wheel 16 from the gray image signal of the infrared camera 14, and the first alarm means. 21 designates a brake overheat warning when the first temperature estimated by the temperature estimating means 18 exceeds a predetermined first threshold value, and when the second temperature estimated by the temperature estimating means 18 exceeds a predetermined second threshold value. It is configured to issue a fire alarm, so the fire has not yet occurred, but there is an alarm for the fact that the brake device and tire are overheated to a state where there is a high possibility of a fire, and the state where the fire has already occurred Both warnings for fire spread prevention caused by the occurrence of fire can be issued in stages.

  The infrared camera 14 is provided on the side mirror 13 of the track 10 so that the side of the track 10 to be photographed includes the periphery of the front wheel 17 of the track 10. The front wheel temperature estimating means 18 for estimating the temperature of one or both of the fourth temperatures around the front wheel 17 and the temperature of one or both of the third temperature and the fourth temperature estimated by the front wheel temperature estimating means 18 And the second alarm means 22 for issuing an alarm when the vehicle exceeds a predetermined threshold, so that excessive heat generation from the brake device in the front wheel 17 can be detected effectively, and the brake device in the front wheel 17 can be effectively detected. Abnormal fever can be effectively notified to the driver.

  In the above-described embodiment, the first alarm unit 21 that issues an alarm when one or both of the first temperature and the second temperature estimated by the temperature estimation unit 18 exceed a predetermined threshold has been described. However, the first alarm means 21 issues an alarm when one or both of the value corresponding to the first temperature and the value corresponding to the second temperature estimated by the temperature estimation means 18 exceed a predetermined threshold. You may make it emit. Here, the value corresponding to the temperature includes a value in density at a corresponding portion of the display.

  Further, the rear wheel temperature estimating means 18 uses the first image of each of the left and right rear wheels 16 or the first temperature around each of the left and right rear wheels 16 from the gray image signals of the infrared cameras 14 provided on the left and right side mirrors 13 respectively. Since either one or both of the two temperatures are estimated, the first alarm means 21 detects the difference between the first temperatures of the left and right rear wheels 16 estimated by the temperature estimation means 18 or the first temperature. Even when either one or both of the difference in value corresponding to the difference between the second temperatures of the left and right rear wheels 16 or the difference in value corresponding to the second temperature exceeds a predetermined value You may comprise so that an alarm may be emitted. In this case, when variations occur in the respective brake devices in the left and right rear wheels 16, an alarm can be issued from the difference in the amount of heat generated due to the variations. Can let you know.

  In the above-described embodiment, the second alarm unit 22 that issues an alarm when one or both of the third temperature and the fourth temperature estimated by the temperature estimation unit 18 exceed a predetermined threshold has been described. However, the second alarm means 22 issues an alarm when one or both of the value corresponding to the third temperature and the value corresponding to the fourth temperature estimated by the temperature estimation means 18 exceed a predetermined threshold. You may make it emit. Here, the value corresponding to the temperature includes a value in density at a corresponding portion of the display.

  Further, the front wheel temperature estimating means 18 determines the third temperature of each of the left and right front wheels 17 or the fourth temperature around each of the left and right front wheels 17 from the gray image signals of the infrared cameras 14 provided on the left and right side mirrors 13 respectively. Since either one or both are estimated, the second alarm means 22 corresponds to the difference between the third temperatures of the left and right front wheels 17 estimated by the front wheel temperature estimation means 18 or the third temperature. A warning is issued even when one or both of the difference in values, the difference in the fourth temperature of each of the left and right front wheels 17 or the difference in the value corresponding to the fourth temperature exceeds a predetermined value for a predetermined time. You may comprise. In this case, when variations occur in the respective brake devices in the left and right front wheels 17, an alarm can be issued from a difference in the amount of heat generated due to the variations, so an abnormality related to the variations can be effectively provided to the driver. I can let you know.

It is a figure which shows the structure of the vehicle fire alarm apparatus of this invention embodiment. It is a figure which shows the image | video projected on the display of the apparatus. It is a perspective view of the cab of the truck provided with the device. It is a flowchart which shows operation | movement of the apparatus. It is a top view of the track | truck with which the apparatus was provided.

Explanation of symbols

10 truck 13 side mirror 14 infrared camera 16 rear wheel 17 front wheel 18 rear wheel temperature estimating means 21 first alarm means 22 second alarm means A part corresponding to rear wheel B part corresponding to surrounding of rear wheel C equivalent to front wheel Part D The part corresponding to the circumference of the front wheel

Claims (10)

The object to be photographed is provided on the side mirror (13) of the vehicle (10) so as to be able to photograph the side of the vehicle (10) including the periphery of the rear wheel (16) of the vehicle (10). An infrared camera (14) that can output as a grayscale video signal according to temperature,
The first image of the rear wheel (16) is obtained from the grayscale video signal in one or both of the portion (A) corresponding to the rear wheel of the infrared camera (14) and the portion (B) corresponding to the periphery of the rear wheel. A rear wheel temperature estimating means (18) for estimating one or both of a temperature and a second temperature around the rear wheel (16);
Either the first temperature or the value corresponding to the first temperature estimated by the temperature estimation means (18), or the value corresponding to the second temperature or the second temperature, or both exceed a predetermined threshold value. A vehicle fire alarm device comprising first alarm means (21) for issuing an alarm when   The first alarm means (21) is either or both of the first temperature estimated by the temperature estimation means (18), the value corresponding to the first temperature, the second temperature, or the value corresponding to the second temperature. The vehicle fire alarm device according to claim 1, wherein the vehicle fire alarm device is configured to issue an alarm when the vehicle exceeds a predetermined threshold and the vehicle (10) exceeds a predetermined speed.   The first alarm means (21) is either or both of the first temperature estimated by the temperature estimation means (18), the value corresponding to the first temperature, the second temperature, or the value corresponding to the second temperature. The vehicle fire alarm device according to claim 1 or 2, wherein the vehicle fire alarm device is configured to issue an alarm when a state in which the value exceeds a predetermined threshold value continues for a predetermined time.   The rear wheel temperature estimating means (18) detects the rear wheel (16) from the gray image signals in both the part (A) corresponding to the rear wheel of the infrared camera (14) and the part (B) corresponding to the periphery of the rear wheel. The first alarm means (21) is configured to estimate both the first temperature and the second temperature around the rear wheel (16), and the first alarm means (21) is estimated by the temperature estimation means (18). A brake overheat alarm is issued when the temperature exceeds a predetermined first threshold, and a fire alarm is generated when the second temperature estimated by the temperature estimating means (18) exceeds a predetermined second threshold. The vehicle fire alarm device according to any one of claims 1 to 3. Infrared cameras (14) are provided on the left and right side mirrors (13) of the vehicle (10),
The rear wheel temperature estimating means (18) is configured to detect the first temperature of each of the left and right rear wheels (16) from the gray image signals of the infrared cameras (14) provided on the left and right side mirrors (13) or the left and right rear wheels, respectively. Configured to estimate either or both of the respective second temperatures around (16),
The first alarm means (21) is a difference between the first temperatures of the left and right rear wheels (16) estimated by the temperature estimation means (18), a difference between values corresponding to the first temperature, or the left and right A warning is issued even when one or both of the difference between the second temperatures of the rear wheels (16) or the difference between the values corresponding to the second temperature exceeds a predetermined value for a predetermined time. The vehicle fire alarm device according to any one of claims 1 to 4, wherein the vehicle fire alarm device is configured as described above. The infrared camera (14) is provided on the side mirror (13) of the vehicle (10) so that the side of the vehicle (10) to be photographed includes the periphery of the front wheel (17) of the vehicle (10),
The third temperature of the front wheel (17) and the third temperature of the front wheel (17) from the grayscale video signal in one or both of the portion (C) corresponding to the front wheel (D) and the portion (D) corresponding to the periphery of the front wheel of the infrared camera (14) Front wheel temperature estimating means (18) for estimating the temperature of one or both of the fourth temperatures around the front wheel (17);
One or both of the third temperature or the value corresponding to the third temperature estimated by the front wheel temperature estimating means (18) or the value corresponding to the fourth temperature or the fourth temperature are predetermined. The vehicle fire alarm device according to any one of claims 1 to 5, further comprising second alarm means (22) for issuing an alarm when the threshold value is exceeded.   The second alarm means (22) is either or both of the third temperature estimated by the temperature estimation means (18), a value corresponding to the third temperature, a fourth temperature or a value corresponding to the fourth temperature. The vehicle fire alarm device according to claim 6, wherein the vehicle fire alarm device is configured to issue an alarm when the temperature of the vehicle exceeds a predetermined threshold value and the vehicle (10) exceeds a predetermined speed.   The second alarm means (22) is either or both of the third temperature estimated by the temperature estimation means (18), a value corresponding to the third temperature, a fourth temperature or a value corresponding to the fourth temperature. 8. The vehicle fire alarm device according to claim 6 or 7, wherein an alarm is issued when a state in which the temperature exceeds a predetermined threshold value continues for a predetermined time.   The front wheel temperature estimating means (18) detects the third temperature of the front wheel (17) from the grayscale video signal in both the part (C) corresponding to the front wheel of the infrared camera (14) or the part (D) corresponding to the periphery of the front wheel. The second alarm means (22) is configured to estimate the temperature of both of the fourth temperatures around the front wheel (17), and the second alarm means (22) has the predetermined third temperature estimated by the front wheel temperature estimation means (18). A brake overheat warning is issued when the first threshold value is exceeded, and a fire alarm is issued when the fourth temperature estimated by the front wheel temperature estimating means (18) exceeds a predetermined second threshold value. Item 9. The vehicle fire alarm device according to any one of Items 6 to 8. Infrared cameras (14) are provided on the left and right side mirrors (13) of the vehicle (10),
The front wheel temperature estimating means (18) is configured to detect the third temperature of each of the left and right front wheels (17) from the gray image signals of the infrared cameras (14) provided on the left and right side mirrors (13) or the left and right front wheels (17). Configured to estimate either or both of the respective fourth temperatures around
The second alarm means (22) is a difference between the third temperature of the left and right front wheels (17) estimated by the front wheel temperature estimation means (18) or a difference between values corresponding to the third temperature, or the left and right A warning is issued even when one or both of the difference between the fourth temperatures of the front wheels (17) and the difference between the values corresponding to the fourth temperature exceeds a predetermined value for a predetermined time. The vehicle fire alarm device according to any one of claims 6 to 9, wherein the vehicle fire alarm device is configured.

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