JP2007125984A - Vehicular light shielding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular light shielding device capable of preventing any adverse effect caused by a change in peripheral brightness. <P>SOLUTION: The vehicular light shielding device comprises a control ECU 10, a light shielding unit 20, a navigation device 30, a vehicle speed sensor 40, and an illuminance sensor 50. The control ECU 10 comprises a tunnel detection unit 11, a storage unit 12, and a control unit 13. The tunnel detection unit 11 detects a distance from a vehicle to a tunnel entrance and/or a distance from the vehicle to a tunnel exit based on signals of the navigation device 30 and the vehicle speed sensor 40. The control ECU 10 sets the light shielding unit 20 in a light shielding state at least either at the time when it is determined that the distance between the vehicle and the tunnel entrance reaches a predetermined value or at the time when it is determined that a predetermined time is elapsed after the vehicle passes the tunnel exit from the time when the distance between the vehicle and the entrance exit reaches a prescribed value based on the result of the detection of the tunnel detection unit 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle shading device.

Conventionally, there existed what was shown to patent document 1 as a light-shielding device for vehicles. FIG. 5 is an image diagram showing a schematic configuration of a conventional vehicle shading device. The vehicle shading device shown in Patent Document 1 includes slits 15 and 16 having a predetermined length in the roof trim 12 along the windshield 13 and the side glass 14. The sun visors 17 and 18 on the front side and the side side are slid in and out from the slits 15 and 16.
Japanese Patent Laid-Open No. 5-278463

  However, when the vehicle travels through the tunnel and leaves the tunnel, the brightness around the vehicle may suddenly become brighter. Therefore, the driver may feel dazzled because the pupil cannot follow the change in ambient brightness. In addition, when the vehicle enters the tunnel, the brightness around the vehicle may suddenly become dark. Accordingly, the driver may feel dark because the pupil cannot follow the change in ambient brightness.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle shading device that can prevent adverse effects due to changes in ambient brightness.

  In order to achieve the above object, a vehicle shading device according to claim 1 is provided with a shading part capable of shielding light incident on a vehicle interior, an interval between the vehicle and the tunnel entrance, and / or an exit of the vehicle and tunnel. A tunnel detection means for detecting the distance between the vehicle and the time when it is determined that the distance between the vehicle and the tunnel entrance has reached a predetermined value based on the detection result of the tunnel detection means, and the distance between the vehicle and the tunnel exit is predetermined. And at least one of a period from when the value is reached to when it is determined that a predetermined interval has passed after the vehicle exits from the exit of the tunnel.

  As described above, when the interval between the vehicle and the tunnel entrance is determined to have reached a predetermined value and when the interval between the vehicle and the tunnel exit has reached a predetermined value, the vehicle exits from the tunnel exit and reaches the predetermined interval. When the vehicle enters the tunnel, the driver feels dark when the vehicle enters the tunnel, or when the vehicle leaves the tunnel Further, it is possible to prevent the driver from feeling dazzling due to changes in ambient brightness.

  Further, in the vehicle shading device according to claim 2, the control means cancels the shading state of the shading portion when it is determined that the vehicle has reached the tunnel based on the detection result of the tunnel detecting means. It is a feature.

  Thus, since it is not necessary to put the light shielding portion in the tunnel in the tunnel, it is preferable to cancel the light shielding state when it is determined that the vehicle has reached the tunnel.

  Moreover, as a tunnel detection means, as shown in Claim 3, it is preferable to provide the front illumination intensity sensor and the upper illumination intensity sensor of a vehicle. According to a fourth aspect of the present invention, the tunnel detection means includes a position detection means for detecting a current position of the vehicle, a map data storage device for storing map data relating to a road map including position information and length information of the tunnel, A travel distance detecting means for detecting the travel distance of the host vehicle may be provided.

  Further, in the vehicle light shielding device according to claim 5, the light shielding unit includes a light shielding plate capable of changing the light transmittance, and a driving unit that slides the light shielding plate into a retracted state and a discharged state, and is controlled. When the light-shielding part is in the light-shielding state, the light-shielding plate is ejected by the driving means and the transmittance of the light-shielding plate is adjusted by the driving means. Is placed in the retracted state or the transmittance of the light shielding plate is adjusted.

  As described above, when the light shielding portion is put in the light shielding state, the driving means sets the light shielding plate in the ejected state and adjusts the transmittance of the light shielding plate, and when the light shielding portion is released, the driving means turns off the light shielding. By releasing the plate or adjusting the transmittance of the light shielding plate, it is possible to easily switch between the light shielding state and the light shielding state.

  In the vehicle shading device according to claim 6, the control means calculates the change rate of the transmittance of the shading plate according to the distance between the vehicle and the entrance of the tunnel, and gradually increases the transmittance based on the change rate. The light-shielding state of the light-shielding part is canceled by changing to.

  In this way, it is preferable that the state of the driver's pupil can be gradually changed by gradually changing the transmittance according to the distance between the vehicle and the entrance of the tunnel to release the light shielding state.

  Further, in the vehicle shading device according to claim 7, the control means calculates the change rate of the transmittance of the shading plate according to the distance between the vehicle and the tunnel exit, and gradually increases the transmittance based on the change rate. The light shielding portion is brought into a light shielding state by changing to the above.

  Thus, it is preferable that the state of the pupil of the driver can be gradually changed by gradually changing the transmittance according to the distance from the vehicle to the exit of the tunnel so that the light shielding portion is in the light shielding state.

  In the vehicular shading device according to claim 8, the control means sets the transmittance in the shading state based on the detection result of the front illuminance sensor and / or the upper illuminance sensor. .

  As described above, it is preferable to set the transmittance in the light-shielded state based on the detection result of the front illuminance sensor and / or the upper illuminance sensor, because the transmittance according to the ambient brightness can be obtained.

  In the vehicle light shielding device according to claim 9, the control means sets the transmittance at the time of the light shielding state to a minimum value.

  In this way, by setting the transmittance at the time of the light shielding state to the lowest value, when the vehicle enters the tunnel, it feels dark due to the change in ambient brightness, or when the vehicle leaves the tunnel, the ambient brightness changes Can further prevent dazzling.

  In the vehicle shading device according to claim 10, the control means sets the transmittance at the time of releasing the shading state to the maximum value.

  The time point when the light shielding state is released is a time point when there is not much change in ambient brightness. Therefore, by setting the transmittance at the time of release to the maximum value, it is possible to prevent light incident on the vehicle interior from being shielded more than necessary.

  Further, as described in claim 11, the light shielding unit includes a light shielding plate and a driving unit that slides the light shielding plate into a storage state and a discharge state, and the control unit places the light shielding unit in a light shielding state. In the case where the light shielding plate is ejected by the driving means and the light shielding state of the light shielding portion is released, the light shielding plate may be retracted by the driving means.

  According to a twelfth aspect of the present invention, the vehicle shading device includes a time output means for outputting the current time, and the control means operates when the current time is within a predetermined time range. Is.

  After sunset or before sunrise, it is not so bright even outside the tunnel. Therefore, by operating when the current time is within the predetermined time range, it is necessary to go out of the tunnel when it is necessary, that is, when it is likely to feel dark when entering the tunnel. The light can be shielded only during the time when there is a high possibility that the user will feel dazzled.

  Further, in the vehicle shading device according to claim 13, the control means operates when the detection result of the front illuminance sensor and / or the upper illuminance sensor is within a predetermined range.

  The brightness outside the tunnel varies depending on the weather. Therefore, the light shielding state can be made only when necessary by operating when the detection result of the front illuminance sensor and / or the upper illuminance sensor is within a predetermined range.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a vehicle shading device according to an embodiment of the present invention. FIG. 2 is an image diagram showing an installation example of the light shielding unit 20 and the illuminance sensor 50 in the embodiment of the present invention.

  As shown in FIG. 1, the vehicle light shielding device in the present embodiment includes a control ECU 10, a light shielding unit 20, a navigation device 30, a vehicle speed sensor 40, an illuminance sensor 50, and the like.

  The control ECU 10 is composed mainly of a microcomputer, and includes a memory such as ROM, RAM, and EEPROM, an interface circuit, a bus line for data transfer, and the like, and includes a tunnel detection unit 11, a storage unit 12, a control unit 13, and the like. Is provided.

  The tunnel detection unit 11 detects the distance between the host vehicle and the tunnel entrance and the tunnel exit based on the detection result of the position detection device 32 of the navigation device 30, the stored contents of the map data storage device 33, and the detection result of the vehicle speed sensor 40. Then, a detection signal indicating the detection result is output to the control unit 13. Therefore, the tunnel detection unit 11, the position detection device 32, the map data storage device 33, and the vehicle speed sensor 40 correspond to the tunnel detection means of the present invention.

  The storage unit 12 stores an illuminance signal, which is a detection result of the upper illuminance sensor 51 and the front illuminance sensor 52, and the transmittance of the light shielding plate 22 described later. The lighter the brightness indicated by the illuminance signal is associated with a smaller value of the transmittance, and the darker the brightness indicated by the illuminance signal is associated with a greater value of the transmittance.

  The control unit 13 outputs a control signal based on the detection result of the tunnel detection unit 11, the storage content of the storage unit 12, the detection result of the illuminance sensor 50, etc., thereby releasing the light shielding state and the light shielding state of the light shielding unit 20. This is for controlling or setting the transmittance of the light shielding plate 22. Therefore, the control unit 13 corresponds to the control means of the present invention.

  The light shielding unit 20 includes a light shielding plate 22 and a drive unit 21 that drives the light shielding plate 22. The light shielding plate 22 is made of a material having variable transmittance such as electrochromic or liquid crystal, and changes the transmittance based on a signal from the transmittance adjusting circuit 21b of the driving unit 21. The light shielding plate 22 is driven by the motor 21a of the driving unit 21 and thereby is taken in and out of the storage unit 22a provided on the ceiling of the passenger compartment as shown in FIG. Hereinafter, a state in which the light shielding plate 22 is stored in the storage unit 22a is referred to as a storage state, and a state in which the light shielding plate 22 is discharged from the storage unit 22a is also referred to as a discharge state.

  The navigation device 30 includes a navigation ECU 31, a position detection device 32, a map data storage device 33, a timer unit 34, and the like, along with the current position of the host vehicle, display of a surrounding road map, and a guidance route to a destination, etc. Perform navigation functions.

  The navigation ECU 31 controls the entire navigation device 30 and is configured mainly with a microcomputer, and includes a memory such as a ROM, a RAM, and an EEPROM, an interface circuit, or a bus line for data transfer. The control circuit 1 sets a guide route by a program stored in a ROM, RAM, EEPROM or the like.

  The position detection device 32 is, for example, a GPS (Global Positioning System) receiver, a gyroscope, a distance sensor, or a geomagnetic sensor as a device for detecting the current position coordinates (hereinafter also referred to as current position) of the host vehicle. A sensor is provided. Various sensors output detection signals to the navigation ECU 31. The navigation ECU 31 detects the current position of the host vehicle based on the output detection signal. Then, the navigation ECU 31 outputs a position signal indicating the detected current position to the control ECU 10.

  The map data storage device 33 includes road data used for map display, route guidance, etc., landmark data, facility data, tunnel data such as tunnel position information and tunnel length information (hereinafter also referred to as tunnel information), etc. It is a storage medium for storing map data related to a map. The storage medium is a rewritable HDD or the like from the viewpoint of data capacity or handling. The timer unit 34 is a timepiece that outputs a time signal indicating the current time to the navigation ECU 31.

  Vehicle speed sensor 40, which is attached in the vicinity of wheels, transmissions, etc., detects a vehicle speed by outputting a pulse signal each time the vehicle travels a predetermined distance, and outputs a vehicle speed signal indicating the detected vehicle speed to control ECU 10 It is.

  As shown in FIG. 2, the illuminance sensor 50 is provided on a windshield or the like, and includes an upper illuminance sensor 51 that detects illuminance above the host vehicle, a front illuminance sensor 52 that detects illuminance ahead of the host vehicle, and the like. Each upper illuminance sensor 51 and front illuminance sensor 52 detect the illuminance above and in front of the host vehicle, and output an illuminance signal indicating the detected illuminance to the control ECU 10.

  Here, the operation of the vehicle shading device according to the present embodiment will be described. FIG. 3 is a flowchart showing the operation of the vehicle shading device according to the embodiment of the present invention. FIG. 4 is a time chart showing the operation of the vehicle shading device according to the embodiment of the present invention.

  In the flowchart shown in FIG. 3, when the own vehicle enters the tunnel using the current position of the own vehicle detected by the position detection device 32, the traveling direction of the own vehicle, and the tunnel information of the map data storage device 33. Start when you consider it.

  First, in step S10, the control unit 13 of the control ECU 10 inputs a time signal timed by the time measuring unit 34 from the navigation ECU 31. Note that the time signal is always input in order to calculate the travel distance after the host vehicle, which will be described later, enters the tunnel.

  In step S11, the control unit 13 of the control ECU 10 determines whether the current time is within 10:00 to 16:00 (predetermined time range) based on the time signal input in step S10. If it is determined that it is within 16:00 to 16:00, the process proceeds to step S12. If it is determined that it is not within 10:00 to 16:00, the process returns to step S10.

  Thus, by operating when the current time is within a predetermined time range such as 10:00 to 16:00, it is possible to feel dark when entering the required time zone, that is, when entering the tunnel It is possible to control the light-shielding unit 20 only during a high time period and a time period when there is a high possibility that the user feels dazzling when going out of the tunnel from inside the tunnel. The predetermined time range is not limited to 10:00 to 16:00, but is a time period other than a time zone where the outside of the tunnel is not so bright, such as after sunset to before sunrise.

  In step S12 and step S13, the control unit 13 determines whether or not the light shielding unit 20 is in a light shielding state, that is, whether or not the distance between the host vehicle and the tunnel entrance has reached a predetermined value. In order to do this, the tunnel information from the map data storage device 33 of the navigation device 30 is input, and the position signal indicating the current position of the host vehicle from the position detection device 32 of the navigation device 30 is input.

  In step S14, the control unit 13 determines whether or not the distance (interval) between the host vehicle and the tunnel entrance is within 200 m based on the signals input in step S12 and step S13. If it is determined that there is a need, the light shielding unit 20 needs to be in a light shielding state, and the process proceeds to step S15. If it is determined that it is not within 200 m, the light shielding unit 20 is not required to be in a light shielding state, and the process proceeds to step S10. Return.

  In step S15, the control unit 13 inputs the illuminance signal of the upper illuminance sensor 51 in order to set the initial transmittance T1 of the light shielding plate 22 when the light shielding unit 20 is in the light shielding state.

  In step S <b> 16, the control unit 13 sets the initial transmittance T <b> 1 of the light shielding plate 22 based on the illuminance signal input in step S <b> 15 and the storage content of the storage unit 12, as indicated by point A in FIG. 4. That is, the control unit 13 reads the transmittance associated with the illuminance signal of the upper illuminance sensor 51 input in step S15 from the storage unit 12, and sets the read transmittance as the initial transmittance T1.

  In step S17, the control unit 13 outputs a control signal to the light shielding unit 20 and drives the motor 21a, as indicated by points A 'to A' in FIG. 4, so that the light shielding plate 22 is stored in the storage unit 22a. To discharge from. In this way, the control unit 13 puts the light shielding unit 20 into a light shielding state. Note that the light shielding unit 20 is in a light shielding state by reducing the difference between the brightness outside the tunnel and the brightness inside the tunnel (darkness) by the light shielding plate 22, so that the ambient brightness when the vehicle enters the tunnel. In order to prevent the driver from feeling dark due to the change in the height, the initial transmittance T1 is set to a relatively low value. The transmittance is such that when the transmittance is low, the transmission of light is small, and when the transmittance is high, the transmission of light is large.

  In addition, it is preferable to set the initial transmittance T1 based on the detection result of the upper illuminance sensor 51 because the transmittance according to the ambient brightness can be obtained.

  The initial transmittance may be a minimum value. Even when the initial transmittance is set to the maximum value, it is possible to prevent the driver from feeling dark due to a change in ambient brightness when the vehicle enters the tunnel.

  In step S <b> 18, the control unit 13 inputs a vehicle speed signal from the vehicle speed sensor 40 in order to calculate the time (interval) until the tunnel entrance. In step S19, the control unit 13 regards the distance (interval) to the tunnel entrance as approximately 200 m, and uses the vehicle speed signal input in step S18 to allow the host vehicle to reach the tunnel entrance (expected time). Is calculated.

  In step S20, the control unit 13 sets the transmittance of the light shielding plate 22 when reaching the tunnel as the maximum value, and gradually increases the transmittance from the current transmittance T1 to the maximum value in the expected time calculated in step S19. The rate of change for changing is calculated.

  In step S21, the control unit 13 calculates a transmittance Tn that changes in accordance with the change rate calculated in step S20. In step S22, the control unit 13 resets the transmittance of the light shielding plate 22 to the transmittance Tn calculated in step S21, so that the point of the light shielding plate 22 is changed from point A 'to point B in FIG. The light-shielding state of the light-shielding part 20 is canceled when the own vehicle enters the tunnel by gradually changing the transmittance. In addition, when canceling the light shielding state of the light shielding unit 20, the light shielding plate 22 may be slid into the retracted state.

  As described above, when it is determined that the distance between the vehicle and the entrance of the tunnel has reached a predetermined value, the light-shielding unit 20 is in a light-shielding state, so that when the vehicle enters the tunnel, the driver changes due to changes in ambient brightness. Can be felt dark.

  Further, it is preferable that the state of the driver's pupil can be gradually changed by gradually changing the transmittance according to the interval (time) between the vehicle and the entrance of the tunnel to release the light shielding state.

  Also, the time when the light shielding state is canceled (eg when entering the tunnel) is a time when there is not much change in ambient brightness. Therefore, by setting the transmittance at the time of release to the maximum value, it is possible to prevent light incident on the vehicle interior from being shielded more than necessary.

  In step S23, the control unit 13 determines whether or not the time calculated in step S19 has elapsed, or the host vehicle has entered the tunnel based on the tunnel information in the map data storage device 33 and the detection result of the position detection device 32. It is determined whether or not. Then, the control unit 13 proceeds to step S24 when it is determined that the host vehicle has entered the tunnel, and returns to step S18 when it is not determined that the host vehicle has entered the tunnel.

  In step S <b> 24, the control unit 13 inputs a vehicle speed signal detected by the vehicle speed sensor 40 from the navigation ECU 31 in order to calculate a travel distance after the host vehicle enters the tunnel. In step S25, the control unit 13 calculates the elapsed time since the host vehicle entered the tunnel from the time signal input from step S10, and the calculated elapsed time and the vehicle speed signal input in step S24. Based on the above, the travel distance after the own vehicle enters the tunnel is calculated.

  In step S26, the control unit 13 determines whether or not the light shielding unit 20 is in the light shielding state based on the travel distance calculated in step S25 and the tunnel information input in step S12. It is determined whether or not the distance (interval) with the exit is within 200 m. If it is determined that it is within 200 m, it is considered that the light shielding unit 20 needs to be in a light shielding state, and the process proceeds to step S28. If it is determined that the light shielding unit 20 is not required to be in a light shielding state, the process returns to step S24.

  In step S27, the control unit 13 inputs the illuminance signal of the front illuminance sensor 52 in order to set the exit transmittance T2 of the light shielding plate 22 when the light shielding unit 20 is in the light shielding state.

  In step S28, the control unit 13 sets the outlet transmittance T2 of the light shielding plate 22 to a relatively low value based on the illuminance signal input in step S27 and the storage unit 12, as indicated by point D in FIG. To do. That is, the control unit 13 reads the transmittance associated with the illuminance signal of the front illuminance sensor 52 input in step S27 from the storage unit 12, and sets the read transmittance as the outlet transmittance T2.

  Thus, setting the exit transmittance based on the detection result of the front illuminance sensor 52 is preferable because the transmittance according to the ambient brightness can be obtained.

  In addition, the outlet transmittance may be a minimum value. Even if the initial transmittance is set to the maximum value, it is possible to prevent the driver from feeling dazzled due to a change in ambient brightness when the vehicle leaves the tunnel.

  In step S29, the control unit 13 inputs a vehicle speed signal from the vehicle speed sensor 40 in order to calculate the time (interval) until the tunnel exit. In step S30, the control unit 13 regards the distance (interval) to the tunnel exit as approximately 200 m, and uses the vehicle speed signal input in step S29 to wait for the host vehicle to reach the tunnel exit (expected time). Is calculated.

  In step S31, the control unit 13 calculates a change rate for gradually changing the transmittance of the light shielding plate 22 from the current transmittance to the outlet transmittance T2 set in step S28 in the estimated time calculated in step S30. .

  In step S32, the control unit 13 calculates a transmittance Tm that changes in accordance with the change rate calculated in step S31. In step S33, the control unit 13 sets the transmittance of the light shielding plate 22 to the transmittance Tm calculated in step S32, so that the transmittance of the light shielding plate 22 is shown from point C to point D in FIG. Is gradually changed so that the light-shielding portion 20 is in a light-shielding state when the vehicle exits the tunnel.

  In this way, the light shielding unit 20 is in a light shielding state by reducing the difference between the brightness outside the tunnel and the brightness inside the tunnel (darkness) by the light shielding plate 22, so that the surroundings when the vehicle leaves the tunnel. The exit transmittance T2 is set to a relatively low value to prevent the driver from feeling dazzled by the change in brightness.

  Further, the state of the pupil of the driver can be gradually changed by gradually changing the transmittance according to the interval (time) between the vehicle and the exit of the tunnel so that the light shielding portion 20 is in the light shielding state. preferable.

  In step S34, the control unit 13 determines whether or not the host vehicle has exited the tunnel based on whether or not the time calculated in step S30 has elapsed. If the control unit 13 determines that the host vehicle has exited the tunnel, step S35 is performed. If it is not determined that the vehicle has exited the tunnel, the process returns to step S27.

  In step S35, the control unit 13 determines, based on the time signal input from step S10, whether or not a predetermined interval (5 seconds in the present embodiment) has passed after the vehicle has exited the tunnel and has passed a predetermined time. If it is determined that the time has elapsed, the process proceeds to step S36. If it is not determined that the predetermined time has elapsed, the determination in step S35 is repeated.

  In this way, by setting the light shielding portion 20 in the light shielding state from when the interval between the vehicle and the tunnel exit reaches a predetermined value until it is determined that the vehicle has exited the tunnel exit and the predetermined interval has elapsed, When the vehicle leaves the tunnel, it can be prevented that the driver feels dazzled by a change in ambient brightness.

  In step S36, the control unit 13 outputs a control signal to the light shielding unit 20, thereby driving the motor 21a to store the light shielding plate 22 in the storage unit 22a and increasing the transmittance of the light shielding plate 22. The light shielding state of the light shielding unit 20 is canceled as indicated by point E in FIG.

  In the above-described embodiment, the light shielding unit 20 has been described using the light shielding plate 22 whose transmittance can be changed and the drive unit 21 that drives the light shielding plate 22. However, the present invention is not limited thereto. Is not to be done. The light shielding unit 20 can achieve the object of the present invention as long as it can block light incident on the vehicle interior.

  For example, the light shielding unit 20 may include a light shielding region whose transmittance can be changed on a part (upper part) of the windshield. In this case, the control unit 13 switches between the light shielding state and the cancellation of the light shielding state by outputting a control signal for changing the transmittance of the light shielding region.

  Further, the light shielding unit 20 may include a light shielding plate 22 and a driving unit 21 that slides the light shielding plate 22 between a storage state and a discharge state. In this case, the control unit 13 switches the light shielding state and the cancellation of the light shielding state by outputting a control signal for slidingly driving the light shielding plate 22 to the driving unit 21.

  In the above embodiment, the navigation device 30 is used as the tunnel detection means for detecting the distance between the vehicle and the tunnel entrance and / or the distance between the vehicle and the tunnel exit. It is not limited to this.

  The tunnel detection means can achieve the object of the present invention as long as it detects the distance between the vehicle and the tunnel entrance and / or the distance between the vehicle and the tunnel exit. A detection signal with the front illuminance sensor 52 may be used.

  In this case, a map or the like in which illuminance and distance are stored in association with each other is provided. Based on the detection signals of the upper illuminance sensor 51 and the front illuminance sensor 52 and the stored contents of the map, the distance between the vehicle and the tunnel entrance and / or the distance between the vehicle and the tunnel exit is detected.

  Moreover, in the said embodiment, although the control part 13 demonstrated using the example which operate | moves when the present | current time is in a predetermined time range, this invention is not limited to this. The brightness outside the tunnel varies depending on the weather. Therefore, you may make it operate | move, when the detection result of a front illumination intensity sensor and / or an upper illumination intensity sensor is in a predetermined range. As described above, the operation can be performed only when necessary when the detection result of the front illuminance sensor and / or the upper illuminance sensor is within a predetermined range.

It is a block diagram which shows schematic structure of the light-shielding device for vehicles in embodiment of this invention. It is an image figure which shows the example of installation of the light-shielding part 20 and the illumination intensity sensor 50 in embodiment of this invention. It is a flowchart which shows operation | movement of the light-shielding device for vehicles in embodiment of this invention. It is a time chart which shows operation | movement of the light-shielding device for vehicles in embodiment of this invention. It is an image figure which shows schematic structure of the light-shielding device for vehicles in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Control ECU, 11 Tunnel detection part, 12 Storage part, 13 Control part, 20 Light-shielding part, 21 Drive part, 21a Motor, 21b Transmittance adjustment circuit, 22 Light-shielding plate, 22a Storage part, 30 Navigation apparatus, 31 Navigation ECU, 32 Position detection device, 33 Map data storage device, 34 Timekeeping unit, 40 Vehicle speed sensor, 50 Illuminance sensor, 51 Upper illumination sensor, 52 Front illumination sensor

Claims (13)

A light shielding portion capable of shielding light incident on the passenger compartment;
Tunnel detection means for detecting the distance between the vehicle and the tunnel entrance and / or the distance between the vehicle and the tunnel exit;
When it is determined that the distance between the vehicle and the tunnel entrance has reached a predetermined value based on the detection result of the tunnel detection means, and when the distance between the vehicle and the tunnel exit has reached a predetermined value Control means for setting the light-shielding part to a light-shielding state at least one time until the vehicle exits from the exit of the tunnel and determines that a predetermined interval has passed.
A vehicle shading device comprising:   The said control means cancels | releases the light-shielding state of the said light-shielding part, when it determines with the said vehicle having arrived in the said tunnel based on the detection result of the said tunnel detection means. Vehicle shading device.   The vehicle light-shielding device according to claim 1, wherein the tunnel detection unit includes a front illuminance sensor and an upper illuminance sensor of the vehicle.   The tunnel detection means includes a position detection means for detecting a current position of the vehicle, a map data storage device for storing map data relating to a road map including position information and length information of the tunnel, and a travel distance of the host vehicle. The vehicle light-shielding device according to any one of claims 1 to 3, further comprising a travel distance detecting unit that detects   The light-shielding unit includes a light-shielding plate capable of changing light transmittance, and a driving unit that slides the light-shielding plate into a storage state and a discharge state, and the control unit places the light-shielding unit in a light-shielding state. In the case where the light shielding plate is brought into the ejected state by the driving means and the transmittance of the light shielding plate is adjusted, and when the light shielding state of the light shielding portion is released, the light shielding plate is put into the retracted state by the driving means. 5. The vehicular shading device according to claim 1, wherein the transmittance of the shading plate is adjusted.   The control means calculates a change rate of the transmittance of the light shielding plate according to an interval between the vehicle and the entrance of the tunnel, and gradually changes the transmittance based on the change rate, thereby the light shielding unit. The vehicle shading device according to claim 5, wherein the shading state of the vehicle is released.   The control means calculates a change rate of the transmittance of the light shielding plate according to an interval between the vehicle and the exit of the tunnel, and gradually changes the transmittance based on the change rate, thereby the light shielding unit. The vehicle light-shielding device according to claim 5, wherein the light-shielding device is in a light-shielding state.   The said control means sets the transmittance | permeability in the said light-shielding state based on the detection result of the said front illumination intensity sensor and / or the said upper illumination intensity sensor, The Claim 5 thru | or 7 characterized by the above-mentioned. Vehicle shading device.   The vehicular shading device according to any one of claims 5 to 7, wherein the control means sets the transmittance at the time of the shading state to a minimum value.   The vehicular shading device according to any one of claims 5 to 9, wherein the control means sets the transmittance at the time of releasing the shading state to a maximum value.   The light shielding unit includes a light shielding plate and a driving unit that slides the light shielding plate into a retracted state and a discharged state, and the control unit uses the driving unit to place the light shielding unit in a light shielding state. 5. The vehicle according to claim 1, wherein when the light shielding plate is in a discharge state and the light shielding state of the light shielding portion is released, the light shielding plate is placed in a retracted state by the driving unit. Shading device.   The time output means for outputting the current time is provided, and the control means operates when the current time is within a predetermined time range. Vehicle shading device.   13. The vehicle according to claim 1, wherein the control unit operates when a detection result of the front illuminance sensor and / or the upper illuminance sensor is within a predetermined range. Shading device.

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