JP2009051473A - Parking assistant system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain parking assistant systems in easily installable and utilizable forms as a post attachment product by applying a communication function used for the wheel position detection of a tire air pressure detection device. <P>SOLUTION: The parking assistant systems 1a, 1b are provided with trigger transmitters 20, 60 installed at a neighborhood to a parking space and at a position for defining a range in which a vehicle can be parked; transmitters 10 mounted to respective wheels 200 of the vehicle 100; and a control device 40. The transmitter 10 sends a response signal indicating receiving intensities of trigger signals as responses to the trigger signals transmitted from the trigger transmitters 20, 60. The control device 40 receives the response signals from the respective transmitters 10 and specifies distances of the respective trigger transmitters 20, 60 and the respective transmitters 10 based on the receiving intensities indicated by the received response signals. Further, when the specified distance is within a predetermined warning area, a warning machine 50 or the trigger transmitter 60 with a warning machine is made to issue an alarm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technology that applies a wheel position detection function of a tire air pressure detection device, and in particular, provides parking assistance to a vehicle that is to be parked by notifying a warning about the departure of the vehicle from a parking space. It relates to technology to do.

  Conventionally, a direct type is known as one of tire pressure detectors (TPMS: Tire Pressure Monitoring System) (see, for example, Patent Document 1). In this type of tire pressure detecting device, a transmitter having a pressure sensor is directly attached to a wheel side to which a tire is attached. Also, a receiver is provided on the vehicle body side, and when the detection signal from the pressure sensor is transmitted from the transmitter on the wheel side, the detection signal is received by the receiver on the vehicle body side, and the tire air pressure is detected. To be done.

In such a direct tire pressure detection device, in order to determine which wheel each transmitter is attached to, the position of the wheel is specified by estimating the distance between the transmitter and the receiver by detecting the electric field strength. It is carried out. More specifically, as described in Patent Document 1, electric field strength (hereinafter referred to as reception strength) at the time of receiving a trigger signal from a trigger device provided on the vehicle body side by a transmitter attached to each wheel. Is transmitted, and data indicating the acquired reception intensity is transmitted to the receiver. On the receiver side, the distance between the trigger machine and each transmitter is specified based on the received intensity, thereby determining which position the wheel is attached to each transmitter.
JP 2007-15491 A

  By the way, it is thought that the further spread expansion can be aimed at by adding various additional functions to which the communication function used in the wheel position detection of the tire pressure detection device as described above is applied to the tire pressure detection device.

  Then, the application to the parking assistance system for supporting the vehicle which is going to park in the parking space was examined. In the conventional parking support system, in order to detect and notify the positional relationship between the vehicle and the parking space, for example, a large-scale additional facility such as an in-vehicle camera and a monitor or a radar sensor is required. However, it is difficult to equip a vehicle with these additional facilities as a retrofit product, which has been a problem for further spread and expansion of the parking support system. Therefore, if a parking support system as an additional function of the tire pressure detection device is realized by applying the communication function used in the wheel position detection of the tire pressure detection device, it will be further spread as a product with higher added value. Expected.

  The present invention has been made to solve the above-mentioned problems, and by applying a communication function used in wheel position detection of a tire air pressure detection device, parking in a mode that can be easily equipped and used as a retrofit product. The purpose is to realize a support system.

  The parking assist system according to claim 1, which has been made to achieve the above object, includes a trigger transmitter installed at a location that defines a range in which the vehicle can be parked, and a response to the trigger signal transmitted from the trigger transmitter. As a vehicle-mounted transmitter for transmitting a response signal indicating the reception intensity of the trigger signal, an alarm means for informing an alarm to warn of a deviation from the parking range of the vehicle, and a reception intensity indicated by the received response signal The distance between the trigger transmitter and the in-vehicle transmitter is specified based on the above, and when the specified distance is within a predetermined alarm area, the alarm control means for notifying the alarm means of an alarm is provided.

  According to the parking assistance system configured as described above, a large-scale facility such as an in-vehicle camera and a monitor, a radar sensor, or the like is provided only on the vehicle side with an in-vehicle transmitter that transmits a response signal to the trigger signal from the trigger transmitter. Even if there is no parking space, you can get parking assistance from outside. Therefore, a parking assistance system can be realized in a mode that can be easily equipped and used as a retrofit product. The communication between the trigger transmitter, the in-vehicle transmitter and the response receiving means in the present invention can be applied from the communication function used in the wheel position detection of the above-described tire air pressure detection device. Therefore, as described in claim 7, the in-vehicle transmitter of the present invention is also used as a transmitter of a tire pressure measuring device provided with a pressure measuring means for measuring tire pressure, thereby adding a tire pressure detecting device. A parking support system as a function is realized, and further spread is expected as a product with higher added value.

  In addition, as a facility on the parking lot side, the trigger transmitter is appropriately arranged at a location that defines a parking area such as on the boundary line of the parking space, near the wall, near the obstacle, etc. An alarm can be effectively notified about the deviation from a parking possible range about the required part according to a position. By adopting such a configuration, it is possible to easily arrange the trigger transmitter in a necessary place even by retrofitting. In particular, as described in claim 6, the facility on the parking lot side can be retrofitted by being configured with an arbitrary number of units that can be arranged at arbitrary locations according to the shape of the parking area and the position of obstacles. A parking support system can be constructed in a manner that can be easily equipped and used as a product.

  Next, the parking support system according to claim 2 has the following characteristics. The alarm control means causes each trigger transmitter to sequentially transmit a trigger signal in a predetermined order, and determines whether each trigger transmitter and each response signal are based on this transmission order and the order in which the response signals are received from each in-vehicle transmitter. The distance to each in-vehicle transmitter is specified for each trigger transmitter from the correspondence relationship. Then, when any one of the specified distances for each trigger transmitter is within the alarm area, the alarm means is notified of an alarm for the trigger transmitter at the location.

  By configuring in this way, it is possible to identify which trigger transmitter the received response signal corresponds to from the correspondence between the trigger signal transmission order and the response signal reception order for the trigger signal. can do. Therefore, it becomes possible to specify the distance to the in-vehicle transmitter individually for a plurality of trigger transmitters installed, and the alarm targets the trigger transmitter whose distance from the in-vehicle transmitter is within the warning range. Can be notified individually and more effective driving support can be provided.

  In addition, as a method for notifying the alarm in a manner in which the trigger transmitter that is the target of the alarm is clearly specified, a method for centrally informing at one place as described in claim 3 can be cited. Specifically, for example, it is conceivable that a display device or a voice output device is arranged at a position that is easy to see from the driver of the vehicle in the vicinity of the parking space, and a location to be alarmed is displayed or notified by voice.

  Alternatively, as described in claim 4, it is conceivable that alarm means are integrally provided in each trigger transmitter so that alarms for individual trigger transmitters can be individually notified. Specifically, for example, when an indicator light or a sound output device is provided for each trigger transmitter, and the distance between the trigger transmitter arranged at a certain location and the in-vehicle transmitter is within the warning range, the display of the relevant location is displayed. It is conceivable to operate only the lamp and the sound output device. By doing in this way, it becomes clear for a driver where it may deviate from a parking space, and effective parking assistance can be performed.

Next, the parking support system according to claim 5 is characterized in that the mode of alarm to be notified to the alarm means is changed according to the degree of approach between the trigger transmitter and the in-vehicle transmitter.
In this way, for example, the closer the distance between the trigger transmitter and the in-vehicle transmitter, the greater the intensity of the alarm, such as the display emphasis and the volume of the alarm sound. It is possible to provide parking assistance reflected in the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.
[Description of parking support system configuration]
Fig.1 (a) is a block diagram which shows schematic structure of the parking assistance system (centralized alarm type) 1a which is 1st Embodiment of this invention.

  As shown in FIG. 1A, a parking assist system (central alarm type) 1a includes transmitters 10a to 10d attached to the vehicle 100, and a trigger transmitter installed in the vicinity of the boundary line of the parking space where the vehicle 100 is parked. 20a-20c and the warehousing sensor 30, the control apparatus 40, and the alarm device 50 are provided.

  The transmitters 10a to 10d function as a transmitter of a tire pressure measuring device (for example, see Patent Document 1) mounted on the vehicle 100, and are attached to each wheel 200 of the vehicle 100 and attached to each wheel. The tire pressure is detected and data indicating the detection result is transmitted to a receiver (not shown) mounted on the vehicle 100. In addition, since it is not the essence of this invention about the structure of a tire pressure measuring apparatus, detailed description is abbreviate | omitted.

  Furthermore, the transmitters 10a to 10d have the following functions as a characteristic configuration of the present invention. First, a trigger signal by an LF (Low Frequency) radio wave is received and the reception intensity is measured. Then, as a response to the received trigger signal, a response signal including data indicating the measured reception intensity is transmitted to the outside by an RF (Radio Frequency) radio wave. In the following description, when the individual transmitters 10a to 10d are not particularly distinguished, they are simply referred to as transmitters 10.

  The trigger transmitters 20a to 20c output a trigger signal (LF radio wave) having a predetermined electric field strength in accordance with a control signal transmitted from the control device 40. The trigger transmitters 20a to 20c are configured as, for example, a portable self-standing unit or a wall-hanging unit, and are appropriately arranged according to the shape of the parking space and the position of the obstacle. As an arrangement location, the location which prescribes | regulates the range which vehicles can park on the boundary line of a parking space, the vicinity of an obstacle, etc. is mentioned. In the case shown in FIG. 1 (a), one (20a, 20b) is arranged at each end of the entrance side of the parking space, and one (20c) is arranged at the central part on the abutting side of the parking space. In the following description, when the individual trigger transmitters 20a to 20c are not particularly distinguished, they are simply expressed as the trigger transmitter 20.

The warehousing sensor 30 is configured by, for example, an infrared sensor, and detects the approach of the vehicle 100 to the parking space, and inputs the detection result to the control device 40.
The control device 40 is installed as equipment on the parking lot side, controls the transmission timing of the trigger signal from each trigger transmitter 20a-20c, and each transmitter 10a-10d as a response to the transmitted trigger signal. The response signal (RF radio wave) transmitted from is received. And based on the reception intensity | strength of the trigger signal shown by a response signal, the distance with each transmitter 10a-10d is specified for every trigger transmitter 20a-20c, and this specified distance is in a predetermined warning range. In the case, the alarm is notified through the alarm device 50.

  The alarm device 50 is disposed in the vicinity of the parking space at a position that can be seen by the driver of the vehicle 100 that is about to park, and the vehicle 100 indicates an alarm that warns of a departure from the parking space while clearly indicating the location to be alarmed. This is a notification to the driver. Here, the location to be alerted is a location where the trigger transmitter 20 determined that the distance from the transmitter 10 is within a predetermined alarm range among the trigger transmitters 20a to 20c. That's it. The alarm device 50 is configured so that alarms targeting each of these locations can be concentrated and reported at one location. As a specific configuration of the alarm device 50, for example, a display device that displays an alarm and a location that is the target of the alarm, a warning lamp, an audio output device that outputs the alarm and the location that is the target of the alarm by voice, Or what was comprised as a unit which combined them is mentioned.

Next, FIG.1 (b) is a block diagram which shows schematic structure of the parking assistance system (individual alarm type) 1b which is 2nd Embodiment of this invention.
The parking support system (individual alarm type) 1b according to the second embodiment is an individual trigger instead of the alarm device 50 and the trigger transmitters 20a to 20c in the parking support system (central alarm type) 1a according to the first embodiment. The difference is that trigger transmitters (with alarm devices) 60a to 60c in which an alarm device is integrated with the transmitter are installed in the vicinity of the boundary line of the parking space. Since the transmitters 10a to 10d, the warehousing sensor 30, and the control device 40 are the same as or equivalent to the configuration in the first embodiment, detailed description is omitted.

  The trigger transmitters 60a to 60c operate a warning to warn of deviation from the parking space in addition to the function of outputting a trigger signal (LF radio wave) having a predetermined electric field strength according to the control signal transmitted from the control device 40. It has a function to notify the person. And the control apparatus 40 alert | reports an alarm separately in the location where it was determined that the distance with the transmitter 10 is in the predetermined | prescribed alarm range among each trigger transmitter 60a-60c. Can be clearly shown to the driver of the vehicle 100. In the following description, when the individual trigger transmitters 60a to 60c are not particularly distinguished, they are simply referred to as the trigger transmitter 60.

  2A is a block diagram showing a schematic configuration of the transmitter 10 (common to the first and second embodiments), and FIG. 2B is a schematic configuration of the trigger transmitter 20 in the first embodiment. (C) is a block diagram showing a schematic configuration of a trigger transmitter (with an alarm device) 60 in the second embodiment, and (d) is a block diagram showing a schematic configuration of the control device 40. It is a figure (common to 1st, 2 embodiment).

As shown in FIG. 2A, the transmitter 10 includes an LF receiver 11, an RF transmitter 12, a controller 13, a pneumatic sensor 14, and antennas 15 and 16.
The LF receiving unit 11 receives a trigger signal (LF radio wave) from the trigger transmitters 20 and 60 via the antenna 15 and sends the received trigger signal to the control unit 13. The RF transmission unit 12 is for transmitting the response signal transmitted from the control unit 13 to the external control device 40 via the antenna 16 by RF radio waves. When the transmitter 10 functions as a transmitter of a tire pressure measuring device mounted on the vehicle 100, the LF receiver 11 and the RF transmitter 12 are not shown in FIG. Various signals are sent and received between them.

  The control unit 13 is configured around a known microcomputer including a CPU, a ROM, a RAM, an I / O, a bus line connecting these, and the like. The parking support according to the embodiment is performed according to a program stored in the ROM. Predetermined processing relating to the systems 1a and 1b and the tire pressure measuring device is executed.

  The control part 13 performs the following processes as a process which concerns on the parking assistance systems 1a and 1b of the embodiment. First, the reception intensity of the trigger signal received via the LF receiver 11 is measured. Then, a response signal including data indicating the measured reception intensity is generated, and the generated response signal is transmitted to the external control device 40 via the RF transmission unit 12.

  The air pressure sensor 14 includes, for example, a diaphragm type pressure sensor, and outputs a detection signal corresponding to the tire air pressure to the control unit 13. The detection result by the air pressure sensor 14 is transmitted by the control unit 13 to the receiver of the tire pressure measuring device through the RF transmission unit 12.

The trigger transmitter 20 according to the first embodiment includes an LF transmitter 21 and an antenna 22 as shown in FIG.
The LF transmitter 21 is communicably connected to the control device 40, and transmits a trigger signal with a predetermined electric field intensity via the antenna 22 in accordance with a control signal transmitted from the control device 40 at a predetermined timing.

The trigger transmitter 60 according to the second embodiment includes an LF transmitter 61, an antenna 62, and an alarm output unit 63, as shown in FIG.
Since the LF transmission unit 61 and the antenna 62 are the same as the LF transmission unit 21 and the antenna 22 in the trigger transmitter 20 of the first embodiment, description thereof is omitted. The alarm output unit 63 is communicably connected to the control device 40 and notifies an alarm according to a control signal from the control device 40. As a specific configuration of the alarm output unit 63, for example, a display device that displays an alarm to warn of deviation from a parking space, an alarm lamp, an audio output device that outputs the alarm by voice, or those The combination is mentioned.

As illustrated in FIG. 2D, the control device 40 includes an RF receiving unit 41, a control unit 42, and an antenna 43.
The RF receiver 41 receives response signals (RF radio waves) from the trigger transmitters 20 and 60 via the antenna 43 and sends the received response signals to the controller 42.

  The control unit 42 is composed mainly of a well-known microcomputer comprising a CPU, ROM, RAM, I / O and a bus line connecting them, and executes predetermined processing according to a program stored in the ROM. To do. In the first embodiment, the trigger transmitters 20a to 20c, the warehousing sensor 30, and the alarm device 50 are connected to the control unit 42. On the other hand, in 2nd Embodiment, each trigger transmitter (with an alarm device) 60a-60c and the warehousing sensor 30 are connected. The control unit 42 includes a connection interface capable of simultaneously connecting a plurality of trigger transmitters 20 and 60, and the number of trigger transmitters 20 and 60 to be connected is set to an arbitrary number between 1 and a predetermined maximum number. It is configured to be able to.

  The control unit 42 outputs a control signal for causing each trigger transmitter 20, 60 to output a trigger signal, and then receives a response signal transmitted from each transmitter 10 via the RF receiver 41. To do. Then, based on the data indicating the reception intensity included in each response signal, the distance from each transmitter 10 is specified for each of the trigger transmitters 20 and 60. If any one of the specified distances is within the predetermined alarm range, the trigger transmitters 20 and 60 corresponding to the specified distance are set as alarm targets. In the first embodiment, the alarm transmitter 50 is used, and the second embodiment is used. If there is, the alarm output unit 63 of the corresponding trigger transmitter 60 is notified of the alarm. The series of processes performed by the control unit 42 will be described in detail later.

Next, FIG. 3 is a figure which shows the variation of the arrangement method to the parking space of the trigger transmitters 20 and 60. FIG.
In the parking assistance systems 1a and 1b of the embodiments, the arrangement location and the number of arrangements of the trigger transmitters 20 and 60 can be arbitrarily arranged according to the shape of the parking space and the position of the obstacle. For example, as shown to Fig.3 (a), the trigger transmitters 20 and 60 can be arrange | positioned at the four corners of the boundary of a parking space, respectively, and it can also be set as the structure which can be alerted from four directions from a parking space. In addition, as shown in FIG. 3 (b), even in the case of a shape entering from the longitudinal side of the parking space, the trigger transmitters 20, 60 are arranged at both ends of the entrance provided on the longitudinal side of the parking space, Furthermore, it can also be set as the structure which arrange | positions the trigger transmitters 20 and 60 in the center part at the collision of a parking space. Furthermore, as shown in FIG.3 (c), it shall be set as the structure which can warn the approach to an obstacle by arrange | positioning the trigger transmitters 20 and 60 adjacent to the obstacle which exists in a parking space. You can also.

  As mentioned above, although the structure of parking assistance system 1a, 1b of each embodiment was demonstrated, the response | compatibility with the structure described in the claim and the structure of parking assistance system 1a, 1b in embodiment is as follows. The transmitter 10 in the embodiment corresponds to the in-vehicle transmitter in the claims. Among these, the LF reception unit 11 corresponds to a trigger reception unit, the RF transmission unit 12 corresponds to a transmission unit, and the control unit 13 corresponds to a reception intensity acquisition unit. Further, the RF receiving unit 41 in the control device 40 corresponds to a response receiving unit. The control unit 42 in the control device 40 corresponds to an alarm control unit and a trigger control unit. The alarm output unit 63 in the alarm device 50 or the trigger transmitter 60 corresponds to an alarm means.

[Description of processing by control device 40]
Next, processing executed by the control unit 42 of the control device 40 will be described with reference to FIGS.

  FIG. 4 is a flowchart showing a procedure of “alarm processing” executed by the control unit 42 of the control device 40. Since the procedure shown in the flowchart of FIG. 4 is common to the first embodiment and the second embodiment, both embodiments will be described collectively below. Explain each time.

  First, the control unit 42 detects a vehicle entering the parking space by the warehousing sensor 30 (S100). And based on the detection signal from the warehousing sensor 30, it is determined whether the vehicle has been detected (S110). Here, when it determines with the receipt sensor 30 not detecting the vehicle (S110: NO), it returns to the process of S100.

  On the other hand, when it is determined that the warehousing sensor 30 has detected the vehicle (S110: YES), a control signal for causing the trigger transmitters 20 and 60 to transmit a trigger signal with a predetermined electric field strength is transmitted at a predetermined timing. It transmits sequentially (S120), and receives the response signal from each transmitter 10 with respect to the trigger signal transmitted from each trigger transmitter 20, 60 according to this control signal (S130).

  Here, the timing at which trigger signals are transmitted from the individual trigger transmitters 20 and 60 will be described with reference to FIG. Here, it is assumed that the number of trigger transmitters 20 and 60 connected to the control device 40 is three, and these are referred to as trigger transmitters A, B, and C, respectively.

  As shown in FIG. 5, the control unit 42 first causes the trigger transmitter A to transmit a trigger signal in the order determined by the program. That is, a control signal is transmitted to the trigger transmitter A. Then, after a predetermined interval necessary for receiving a response signal from each transmitter 10 with respect to the trigger signal transmitted from the trigger transmitter A, the trigger transmitter B is caused to transmit the trigger signal. That is, a control signal is transmitted to the trigger transmitter B. Then, after a predetermined interval necessary for receiving a response signal from each transmitter 10 with respect to the trigger signal transmitted from the trigger transmitter B, the trigger transmitter C is caused to transmit the trigger signal. That is, a control signal is transmitted to the trigger transmitter C.

  Thus, by sequentially transmitting the trigger signals from the trigger transmitters 20 and 60 in a predetermined order and interval, the correspondence between the trigger signal transmission order and the response signal reception order becomes clear. Thereby, the control unit 42 associates the received response signal with respect to the trigger signal transmitted from which trigger transmitter 20 or 60.

  Returning to the description of FIG. After receiving the response signal from each transmitter 10 in S130, the distance to each transmitter 10 is specified for each of the trigger transmitters 20 and 60 from the received intensity data included in the received response signal. (S140).

  Here, it is known that the electric field strength of the LF radio wave used for transmitting the trigger signal attenuates according to the distance. By utilizing the characteristics of the LF radio wave, the control unit 42 determines the attenuation degree of the LF radio wave from the received intensity data transmitted from each transmitter 10, and the trigger transmitters 20 and 60, the transmitter 10, Are estimated. Specifically, the trigger transmitter A and each of the transmitters 10a to 10d are determined based on the reception intensity indicated by each response signal transmitted from each of the transmitters 10a to 10d as a response to the trigger signal from the trigger transmitter A. Identify the distance. Similarly, the distance from each transmitter 10a-10d is specified also about trigger transmitters B and C.

  Next, it is determined whether any of the distances specified in S140 is within a predetermined alert range (S150). Here, the predetermined warning range is registered in advance in the memory or the like of the control unit 42 to prevent deviation from the parking space of the vehicle with reference to the position of the trigger transmitters 20 and 60. It is desirable to set a sufficient distance. Moreover, the configuration may be such that a warning range is individually set for each of the trigger transmitters 20 and 60, or a common warning range may be set for each of the trigger transmitters 20 and 60. May be.

  When it is determined in S140 that none of the distances is within the alert range (S150: NO), the process proceeds to S190. On the other hand, when it is determined that any of the distances is within the alert range (S150: YES), the trigger transmitters 20 and 60 corresponding to the distance are specified as the alert target (S160).

  Subsequently, the alarm intensity corresponding to the distance determined to be within the alert range is set (S170). Specifically, the shorter the distance determined to be in the alert range, the greater the alarm intensity, that is, the alarm setting in a more emphasized mode is set to be notified, and it is determined to be in the alert range. It sets so that the alarm of the aspect which is not emphasized may be alert | reported, so that distance is long.

  And in the case of the parking assistance system 1a of 1st Embodiment, it is a warning object with respect to the alarm device 50, or in the case of the parking assistance system 1b of 2nd Embodiment, among several trigger transmitters 60. Only the alarm output unit 63 of the trigger transmitter 60 is caused to output an alarm in a manner corresponding to the alarm intensity set in S170 (S180).

  On the other hand, the alarm device 50 in the parking support system 1a of the first embodiment displays on the screen an alarm to warn of deviation from the parking space and information indicating a location that is the target of the alarm, Output by voice. The intensity of the alarm may be expressed by blinking of a warning lamp, volume of alarm sound, pitch, tempo, or the like.

  On the other hand, the alarm output unit 63 in the parking support system 1b of the second embodiment displays an alarm to warn of deviation from the parking space on the screen or outputs it by voice. Further, similarly to the alarm device 50 of the first embodiment, the intensity of the alarm may be expressed by blinking of an alarm lamp, volume of alarm sound, pitch, tempo, or the like.

  Next, in S190, it is determined whether or not the vehicle has been stowed. Specifically, it is determined whether or not the distance between each trigger transmitter 20, 60 and each transmitter 10 has changed for a certain period of time or a sensor for detecting the movement of the vehicle is provided separately. What is necessary is just to determine whether the warehousing is completed by determining whether the vehicle has stopped for a certain time or more from the result.

  If it is determined that the vehicle has not been received (S190: NO), the process returns to S120, and the processes of S120 to S190 are sequentially repeated. On the other hand, when it is determined in S190 that the vehicle has been received (S190: YES), the “alarm processing” is terminated.

[effect]
According to the parking assistance systems 1a and 1b of the above embodiment, the following effects can be obtained.
(1) By providing the vehicle 100 with the transmitter 10 that transmits a response signal to the trigger signal from the trigger transmitters 20 and 60, even if there is no large-scale equipment such as an in-vehicle camera and a monitor, a radar sensor, etc. You can get parking assistance. Therefore, a parking assistance system can be realized in a mode that can be easily equipped and used as a retrofit product.

  (2) By using the transmitter 10 as a transmitter of a tire pressure measuring device provided with a pressure sensor 14 for measuring tire pressure, a parking support system as an additional function of the tire pressure detecting device is realized, and more Further spread is expected as a product with high added value.

  (3) By appropriately placing the trigger transmitters 20 and 60 on the boundaries of the parking space, on the walls, on the obstacles, etc., in accordance with the shape of the parking space and the position of the obstacles. An alarm can be effectively notified about the deviation from the parking possible range about a necessary part. In addition, the trigger transmitters 20 and 60 are configured as portable self-supporting units or wall-mounted units, and can be arranged in any number in any location according to the shape of the parking range or the position of the obstacle. In addition, it can provide a parking support system that can be easily equipped and used as a retrofit product for the facilities on the parking lot side.

  (4) The trigger transmitters 20 and 60 are caused to sequentially transmit trigger signals in a predetermined order. From the correspondence between the transmission order and the reception order of response signals with respect to the trigger signals, which trigger transmitter 20 or 60 can be identified. Therefore, it becomes possible to specify the distance to the transmitter 10 individually for the plurality of trigger transmitters 20 and 60 installed, and the trigger transmitter 20 and the distance from the transmitter 10 are within the warning range. Alarms targeting 60 can be individually notified, and more effective driving support can be performed.

  (5) The intensity of the alarm to be notified can be changed according to the degree of approach between the trigger transmitters 20 and 60 and the transmitter 10. Thereby, for example, the closer the distance between the trigger transmitters 20 and 60 and the transmitter 10 is, the greater the degree of emphasis of the alarm display is, or the more emphasis is given to the volume, pitch, tempo, etc. of the alarm sound. It is possible to provide parking assistance that better reflects the situation.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment at all, It is possible to implement in various aspects.

  For example, in the parking assistance systems 1a and 1b of the above-described embodiments, the transmitter 10 attached to the vehicle 100 is also used as the transmitter of the tire pressure measuring device. On the other hand, the structure which makes the transmitter 10 a transmitter for exclusive use of a parking assistance system may be sufficient. In this case, the air pressure sensor 14 can be omitted from the configuration of the transmitter 10 (see FIG. 2A) in the parking assistance systems 1a and 1b of the above embodiments. Furthermore, it is not always necessary to attach each transmitter to a wheel, and the transmitter can be appropriately attached to various parts of the vehicle body. As specific attachment locations, it is desirable to attach along the outer edge of the vehicle body, such as attaching to the front end portion and the rear end portion of the vehicle body, or attaching to the left and right ends of the front end portion and the rear end portion, respectively.

(A) is a block diagram which shows schematic structure of the parking assistance system 1a of 1st Embodiment, (b) is a block diagram which shows schematic structure of the parking assistance system 1b of 2nd Embodiment. 2 is a block diagram showing a schematic configuration of a transmitter 10, trigger transmitters 20, 60, and a control device 40. FIG. It is a figure which shows the variation of the arrangement method to the parking space of the trigger transmitters 20 and 60. FIG. It is a flowchart which shows the procedure of "alarm processing." It is a timing chart which shows typically the transmission timing of the trigger signal from trigger transmitters 20 and 60, and the reception order of the response signal from each transmitter 10 to each trigger signal.

Explanation of symbols

1a ... Parking support system (centralized alarm type), 1b ... Parking support system (individual alarm type)
DESCRIPTION OF SYMBOLS 10 ... Transmitter, 11 ... LF reception part, 12 ... RF transmission part, 13 ... Control part, 14 ... Air pressure sensor, 15, 16 ... Antenna 20 ... Trigger transmitter, 21 ... LF transmission part, 22 ... Antenna, 60 ... Trigger transmitter (with alarm), 61 ... LF transmitter, 62 ... antenna, 63 ... alarm output unit 30 ... entrance sensor 40 ... control device, 41 ... RF receiver, 42 ... control unit, 43 ... antenna 50 ... alarm Machine

Claims (7)

A trigger transmitter that is installed at one or a plurality of locations that define a range in which the vehicle can be parked, and that transmits a trigger signal that can specify the distance between the transmission location and the reception location based on the reception intensity on the reception side;
Trigger receiving means for receiving a trigger signal transmitted from the trigger transmitter, reception intensity acquiring means for acquiring the reception intensity of the trigger signal received by the trigger receiving means, and trigger signal received by the trigger receiving means An in-vehicle transmitter that is attached to each of a plurality of locations of the vehicle, and includes a transmission unit that transmits a response signal indicating the reception strength of the trigger signal acquired by the reception strength acquisition unit to the outside as a response to
Alarm means for notifying the driver of the vehicle of an alarm to warn of a deviation from the parking possible range of the vehicle;
Response receiving means for receiving a response signal transmitted from the in-vehicle transmitter;
When the distance between the trigger transmitter and the in-vehicle transmitter is specified based on the reception intensity indicated by the response signal received by the response receiving means, and the specified distance is within a predetermined warning area, the warning means A parking support system comprising: an alarm control means for causing the alarm to be notified. In the parking assistance system according to claim 1,
The alarm means is configured to be able to notify an alarm in a mode that clearly indicates the trigger transmitter to be an alarm target,
The alarm control means further includes trigger control means for causing the trigger transmitters to sequentially transmit trigger signals in a predetermined order when a plurality of the trigger transmitters are installed, and the trigger control means From the correspondence between each trigger transmitter and each response signal based on the order of transmission and the order of reception of response signals from each vehicle-mounted transmitter, the distance from each vehicle-mounted transmitter for each individual trigger transmitter And when any of the distances for each of the identified individual trigger transmitters is within an alarm region, the alarm means is notified of the alarm for the trigger transmitter at the location. Parking assistance system. In the parking assistance system according to claim 2,
The parking support system, wherein the alarm means is configured to be able to report on alarms targeting individual trigger transmitters in a centralized manner. In the parking assistance system according to claim 2,
The parking means, wherein the warning means is provided integrally with each of the trigger transmitters, and is configured to be able to individually notify a warning for each of the trigger transmitters. system. In the parking assistance system according to any one of claims 1 to 4,
The parking control system, wherein the warning control means changes a warning mode to be notified to the warning means according to a degree of approach between the trigger transmitter and the in-vehicle transmitter. In the parking assistance system according to any one of claims 1 to 5,
The said trigger transmitter is comprised by the unit which can be arrange | positioned by arbitrary numbers in arbitrary locations according to the shape of the parking possible range, and the position of an obstruction. The parking assistance system characterized by the above-mentioned. The parking support system according to any one of claims 1 to 6,
The in-vehicle transmitter is further installed on each of the plurality of tire-equipped wheels, and further includes an air pressure measuring unit that measures the air pressure of the tire, and an air pressure signal indicating the tire air pressure measured by the air pressure measuring unit, A parking assistance system that is also used as a transmitter of a tire pressure measuring device that transmits to a receiver that constitutes the tire pressure measuring device via a transmitting means.

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