JP4182975B2 - Vehicle theft determination device - Google Patents

Description

  The present invention relates to a vehicle theft determination device provided in a vehicle.

As a conventional vehicle theft determination device, when an abnormal inclination of a parked vehicle is detected by a tilt sensor, the vehicle position information detected by a GPS (Global Positioning system) or the like is transmitted to a predetermined receiving destination together with an abnormal signal. A vehicle theft determination device is known.
For example, in Patent Document 1 below, if a third party lifts a front wheel when carrying out a vehicle using a tow truck or the like without permission, the inclination of the vehicle changes greatly despite being parked. It is disclosed that it is possible to detect theft.
Japanese Patent Laid-Open No. 9-240432

  However, in the conventional vehicle theft determination device, for example, when the parking pallet of the multilevel parking lot where the vehicle is parked moves up and down, or when the ferry shakes when transporting the vehicle by ferry, the vehicle is parked safely. However, if the vehicle is inclined even though the vehicle is inclined, the inclination sensor may be detected as an abnormal vehicle inclination. That is, there is a problem that the change in inclination caused by theft and the inclination caused by an event other than theft cannot be distinguished, and the vehicle may be erroneously detected as being stolen.

  Accordingly, an object of the present invention is to realize a vehicle theft determination device that prevents erroneous detection.

In order to achieve the above object, according to the present invention, the vehicle theft determination device detects two or more types of sensors capable of detecting the behavior state of the parked vehicle and sending it as a sensor signal. A vehicle theft determination device provided in a vehicle, wherein the sensor signal acquisition unit acquires each sensor signal sent from the two or more types of sensors, and the sensor signal acquisition unit first sets the vehicle signal after the vehicle is parked. Initial value setting means for setting each sensor signal acquired as an initial value, comparison means for comparing each initial value set by the initial value setting means and each sensor signal acquired by the sensor signal acquisition means this time based on the comparison result by the comparison means, the vehicle will have a, a determination unit configured to determine whether it has been stolen, the two kinds or more sensors, the inclination of the vehicle And detecting a stroke amount of at least one of a tilt sensor capable of transmitting an angle signal based on the tilt and a shock absorber piston rod and a spring constituting the suspension of the vehicle, and based on the stroke amount of the vehicle A technical means is provided that includes a height sensor capable of sending a height signal according to the distance between the vehicle body and the tire of the vehicle .

In the invention according to claim 2 , the vehicle theft determination device includes two or more types of sensors capable of detecting a behavior state of a parked vehicle and sending it as a sensor signal, and is provided in the vehicle. The sensor signal acquisition means for acquiring the sensor signals transmitted from the two or more types of sensors and the sensor signals first acquired by the sensor signal acquisition means after parking the vehicle are set as initial values. An initial value setting means, a comparison means for comparing each initial value set by the initial value setting means and the sensor signal acquired by the sensor signal acquisition means this time, a vehicle based on a comparison result by the comparison means There has judging means for judging whether or not stolen, and the two kinds or more sensors to detect the inclination of the vehicle, send the angle signal based on the inclination And a tire pressure sensor that is individually provided in the tire and that detects a tire air pressure and can send a pressure signal based on the air pressure. Is used.

According to a third aspect of the present invention, the vehicle theft determination device includes two or more types of sensors capable of detecting a behavior state of a parked vehicle and sending it as a sensor signal, and is provided in the vehicle. The sensor signal acquisition means for acquiring the sensor signals transmitted from the two or more types of sensors and the sensor signals first acquired by the sensor signal acquisition means after parking the vehicle are set as initial values. An initial value setting means, a comparison means for comparing each initial value set by the initial value setting means and the sensor signal acquired by the sensor signal acquisition means this time, a vehicle based on a comparison result by the comparison means shock absorber but has a judging means for judging whether or not a theft, the two kinds or more sensors, which constitute the suspension of the vehicle A height sensor capable of detecting a stroke amount of at least one of the piston rod and the spring and sending a height signal according to a distance between the vehicle body of the vehicle and the tire of the vehicle based on the stroke amount; A technical means is provided that includes a tire pressure sensor that is individually provided in a tire and that can detect a tire pressure and send a pressure signal based on the pressure.

According to a fourth aspect of the present invention, the vehicle theft determination device includes two or more types of sensors capable of detecting a behavior state of a parked vehicle and sending it as a sensor signal, and is provided in the vehicle. The sensor signal acquisition means for acquiring the sensor signals transmitted from the two or more types of sensors and the sensor signals first acquired by the sensor signal acquisition means after parking the vehicle are set as initial values. An initial value setting means, a comparison means for comparing each initial value set by the initial value setting means and the sensor signal acquired by the sensor signal acquisition means this time, a vehicle based on a comparison result by the comparison means There has judging means for judging whether or not stolen, and the two kinds or more sensors to detect the inclination of the vehicle, send the angle signal based on the inclination And detecting a stroke amount of at least one of a piston rod and a spring of a shock absorber constituting a suspension of the vehicle and a distance between the vehicle body of the vehicle and the tire of the vehicle based on the stroke amount. A height sensor capable of sending a corresponding height signal, a tire pressure sensor individually provided in the tire, capable of detecting a tire air pressure and sending a pressure signal based on the air pressure; The technical means is used.

According to a fifth aspect of the present invention, in the vehicle theft determination device according to the first, second, or fourth aspect , the inclination sensor is located in the center console near the intersection of diagonal lines on a tire arrangement in a four-wheel vehicle. The technical means that is provided in is used.

According to a sixth aspect of the present invention, in the vehicle theft determination device according to the first, third, or fourth aspect , the height sensor includes a front-rear direction, a left-right direction, and a pair on a tire arrangement in a four-wheel vehicle. The technical means of being provided with respect to each of the two or more suspensions at any position in the angular direction is used.

According to a seventh aspect of the present invention, in the vehicle theft determination device according to any one of the second to fourth aspects, the tire pressure sensor includes a front-rear direction, a left-right direction, and a left-right direction on a tire arrangement in a four-wheel vehicle. The technical means that it is provided with respect to two or more said tires in any position in the diagonal direction is used.

According to an eighth aspect of the present invention, in the vehicle theft determination device according to any one of the first to seventh aspects, the determination means includes any difference between the initial value and the sensor signal. A technical means is used for determining that the vehicle has been stolen when a predetermined threshold value is exceeded.

According to the first to fourth aspects of the invention, two or more types of sensors provided in the vehicle theft determination device detect the behavior state of the parked vehicle and send it as a sensor signal. Here, “parking” means that the driver continuously stops the vehicle while the driver stops the vehicle engine and is away from the vehicle. The “behavioral state of the parked vehicle” means a vehicle state accompanied by a change in the posture of the vehicle such as the inclination and height of the vehicle, and is a concept including a change in tire air pressure due to a change in the vehicle state. . Each sent sensor signal is acquired by the sensor signal acquisition means, and each sensor signal acquired first is set as an initial value by the initial value setting means. Next, the comparison means compares each initial value set by the initial value setting means with each sensor signal acquired by the current sensor signal acquisition means. And based on this comparison result, it is determined whether the vehicle was stolen by the determination means.
For example, when only a tilt sensor is provided, a change in the behavior state of the vehicle that is erroneously detected as being stolen as described in the third paragraph is distinguished from a change in the behavior state of the vehicle due to theft. It cannot be detected separately. On the other hand, since the behavior state of the parked vehicle can be detected by two or more types of sensors, the change in the behavior state of the vehicle due to theft is distinguished and detected. Can do.
That is, a vehicle theft determination device that prevents erroneous detection can be realized.
Further, the two or more types of sensors provided in the vehicle theft determination device include an inclination sensor capable of detecting an inclination of the vehicle and transmitting an angle signal based on the inclination, and a piston of a shock absorber constituting the suspension of the vehicle. A height sensor capable of detecting a stroke amount of at least one of a rod and a spring and sending a height signal according to a distance between a vehicle body of the vehicle and a tire of the vehicle based on the stroke amount; and the tire And a tire pressure sensor that is individually provided and is capable of detecting a tire air pressure and transmitting a pressure signal based on the tire air pressure.
Each of the sensors can detect a change in the behavioral state accompanying the inclination of the vehicle and send it as a sensor signal. Therefore, by combining the signals of two or more types of sensors from the sensors, the inclination state of the vehicle Can be detected in more detail. For this reason, it is possible to distinguish between a change in vehicle inclination caused by theft and a change in vehicle inclination caused by other events.

According to the fifth aspect of the present invention, since the inclination sensor is provided in the vicinity of the intersection of the diagonal lines on the tire arrangement in the four-wheel vehicle, it can detect the inclination in the front-rear direction and the width direction of the vehicle in a balanced manner. it can.

According to the sixth aspect of the present invention, the height sensor is provided for two or more suspensions at any one of the front-rear direction, the left-right direction, and the diagonal direction on the tire arrangement in the four-wheel vehicle. Therefore, it is possible to detect a change in the distance between the vehicle body and the tire due to the inclination of the vehicle in a plurality of directions.
In addition, since two or more height sensors are provided, even if one height sensor fails, the remaining height sensors can be redundantly configured to send sensor signals. Improves.
In particular, when a height sensor is provided for two or more suspensions in a diagonal direction on a tire arrangement in a four-wheel vehicle, Since a change in the distance to the vehicle can be detected, the posture of the vehicle can be detected more accurately, and the accuracy of the vehicle theft determination device can be improved. Furthermore, if at least two height sensors are provided, a change in the distance between the vehicle body and the tire can be detected in response to a change in the behavior state of the vehicle in all directions, front, back, left, and right. Can be reduced.

According to the seventh aspect of the present invention, the tire pressure sensor is provided for two or more tires at any one of the front-rear direction, the left-right direction, and the diagonal direction on the tire arrangement in the four-wheel vehicle. Therefore, when the front of the vehicle is lifted and tilted forward, the weight of the vehicle applied to the front wheel is reduced, so that the tire pressure is reduced. Decreasing behavior can be detected.
In addition, since two or more tire pressure sensors are provided, even if one tire pressure sensor fails, the remaining tire pressure sensors have a redundant configuration that can send out sensor signals. Improves.
In particular, when the tire pressure sensor is provided for two or more tires in a diagonal direction on a tire arrangement in a four-wheel vehicle, the tire pressure corresponding to the change in the inclination in all the front, rear, left and right directions of the vehicle. Therefore, it is possible to detect the attitude of the vehicle more accurately. Thereby, the precision of a vehicle theft determination apparatus can be improved. Furthermore, if at least two tire pressure sensors are provided, it is possible to detect changes in tire pressure in response to changes in the behavior state of the vehicle in all directions, front, back, left, and right, so the number of tire pressure sensors provided is reduced. Can do.

According to the eighth aspect of the present invention, when the difference between each initial value and each sensor signal exceeds a predetermined threshold value, the determination means can determine that the vehicle has been stolen.
Accordingly, since the determination is made by comparing the difference between each initial value and each sensor signal and the threshold value, the vehicle theft can be determined easily and reliably. Further, the determination accuracy can be easily improved by optimizing the threshold value.

  An embodiment of a vehicle theft determination device according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the vehicle theft determination device. FIG. 2 is an explanatory diagram showing the arrangement of the tilt sensor, the height sensor, and the tire pressure sensor. FIG. 3 is an explanatory view of a spring constituting a suspension and a piston rod of a shock absorber. FIG. 4 is a flowchart showing a vehicle theft determination process performed by the vehicle theft determination device. FIG. 5 is an explanatory diagram of a vehicle lifted forward by a tow truck. FIG. 6 is an explanatory diagram of a vehicle tilted together with a pallet parked in a multilevel parking lot.

(Configuration of vehicle theft determination device)
As shown in FIG. 1, the vehicle theft determination device 1 of this embodiment includes an inclination sensor 11, a height sensor 12, and a tire pressure sensor 13, which will be described later, and a control unit 20 that processes data sent from these sensors. It has.
The control unit 20 is a control device provided with a memory device such as ROM and RAM, various input / output interfaces, etc., centering on a CPU (not shown), and an inclination sensor 11, a height sensor 12 and a tire pressure sensor 13 are provided at an input port. Electrically connected.
The control unit 20 parked the vehicle 30 (FIG. 2) and the sensor signal acquisition unit 21 that acquires each sensor signal sent from each of these sensors (the inclination sensor 11, the height sensor 12, and the tire pressure sensor 13). An initial value setting unit 22 that sets each sensor signal first acquired by the sensor signal acquisition unit 21 as an initial value later, and each initial value set by the initial value setting unit 22 and each acquired by the current sensor signal acquisition unit 21 The comparison unit 23 that compares the sensor signals, the determination unit 24 that determines whether the vehicle 30 has been stolen based on the comparison result in the comparison unit 23, and the horn of the vehicle 30 that sounds based on the determination result in the determination unit 24 Or a warning unit 25 that issues a warning such as reporting theft information to a mobile phone or the like.

(Tilt sensor, height sensor and tire pressure sensor)
Next, the inclination sensor 11, the height sensor 12, and the tire pressure sensor 13 will be described. FIG. 2 is an explanatory diagram showing the arrangement of the inclination sensor 11, the height sensor 12 and the tire pressure sensor 13 when the vehicle is viewed from above, and the directions of the arrows F, B, L, and R are respectively the upper and lower sides of the vehicle 30. Corresponds to the horizontal direction.
The inclination sensor 11 is a sensor capable of detecting the inclination of the vehicle 30 based on a change in acceleration generated in the vehicle 30 and sending an angle signal θ based on the inclination. It is provided inside a center console (not shown) provided near the intersection of C1 and C2 (FIG. 5). For this reason, it is possible to detect the inclination in the front-rear direction and the width direction of the vehicle with a good balance.

The height sensor 12 is a sensor that detects the vehicle height based on the stroke amount of at least one of a piston rod 33b and a spring 33c provided in a shock absorber 33a that constitutes a suspension 33 of the vehicle 30 as shown in FIG. For example, the stroke amount is detected by a laser displacement meter (not shown), and a height signal H corresponding to the distance between the vehicle body 31 and the tire 32 of the vehicle 30 can be transmitted based on the stroke amount. As shown in FIG. 2, the height sensor 12 is provided for each suspension 33.
The height sensor 12 may be a sensor that detects a separation distance between the vehicle body 31 and the ground contact surface G of the tire 32.

The tire pressure sensor 13 is a sensor that is individually provided on, for example, a wheel of the tire 32, can detect the air pressure of the tire 32, and can send a pressure signal P based on the air pressure. The tire pressure sensor 13 is provided for each tire 32.
By disposing the height sensor 12 and the tire pressure sensor 13 for each suspension 33 and for each tire 32 as described above, a change in sensor signal corresponding to a change in the inclination of the vehicle 30 in all directions is detected. Therefore, the attitude of the vehicle 30 can be detected more accurately, and the detection accuracy of the vehicle theft determination device 1 can be improved. Furthermore, even if one sensor breaks down, the remaining sensor has a redundant configuration capable of transmitting sensor signals, so that the reliability of the vehicle theft determination device 1 can be improved.

(Vehicle theft determination processing by the vehicle theft determination operation device)
Next, vehicle theft determination processing by the vehicle theft determination device will be described with reference to FIG. This vehicle theft determination process is executed by the control unit 20 shown in FIG. 1, and is performed at a predetermined time interval after the ignition switch of the vehicle 30 is turned off, for example.
First, in the control unit 20, after the vehicle 30 is parked in step S1 (after the ignition switch is turned off), the initial value θi of the angle signal θ first transmitted from the tilt sensor 11 is first transmitted from the height sensor 12. It is determined whether the initial value Hi of the height signal H and the initial value Pi of the pressure signal P initially sent from the tire pressure sensor 13 have been acquired by the sensor signal acquisition unit 21 (FIG. 1).
If it is determined that the initial values θi, Hi, and Pi of the angle signal θ, the height signal H, and the pressure signal P are not acquired in step S1 (S1: No), the process proceeds to step S2. By the step S2, the angle signal θ first sent from the tilt sensor 11, the height signal H sent first from the height sensor 12, and the pressure signal P sent first from the tire pressure sensor 13 are acquired, These are set to initial values θi, Hi, and Pi. This step S2 is performed by the initial value setting unit 22, and when this process is executed, the vehicle theft determination process ends.

On the other hand, if it is determined in step S1 that the initial values θi, Hi, and Pi of the angle signal θ, the height signal H, and the pressure signal P have been acquired (S1: Yes), the current angle signal θ1, high in step S3. The depth signal H1 and the pressure signal P1 are acquired.
Next, in step S4, the angle signal θ1, the height signal H1, and the pressure signal P1 acquired in step S3 are compared with the initial values θi, Hi, and Pi acquired in step S2. This step S4 is performed by the comparison unit 23, and the comparison is performed by using the difference values Δθ, ΔH, ΔP between the angle signal θ1, the height signal H1, and the pressure signal P1 and the initial values θi, Hi, Pi. This is done by calculating each. For the height signal H and the pressure signal P, for example, the largest values among the differences obtained for each of the four sensors are ΔH and ΔP, and are used for the following determination.

Subsequently, in steps S5, S6, and S7, it is determined whether or not the difference values Δθ, ΔH, and ΔP exceed a preset threshold value. The following S5, S6, and S7 are performed by the determination unit 24.
First, in step S5, it is determined whether or not the difference value Δθ of the angle signal θ exceeds the threshold value θs (Δθ> θs). If it is determined that the difference value Δθ of the angle signal θ exceeds the threshold value θs (S5: Yes), then, in step S6, whether the difference value ΔH of the height signal H exceeds the threshold value Hs (ΔH > Hs). If it is determined that the difference value ΔH of the height signal H exceeds the threshold value Hs (S6: Yes), then whether or not the difference value ΔP of the pressure signal P exceeds the threshold value Ps in step S7 (ΔP > Ps). If it is determined that the difference value ΔP of the pressure signal P exceeds the threshold value Ps (S7: Yes), any of the angle signal θ, the height signal H, and the pressure signal P exceeds the threshold values θs, Hs, Ps. Therefore, it is determined that the vehicle 30 has been stolen. In this case, an alarm is issued in subsequent step S8, and the vehicle theft determination process is terminated. This step S8 is performed by the alarm unit 25.

  On the other hand, when any one of the difference value Δθ of the angle signal θ, the difference value ΔH of the height signal H, and the difference value ΔP of the pressure signal P does not exceed the threshold values θs, Hs, Ps (S5: No, S6: No, or S7: No), it is determined that the vehicle 30 has not been stolen, so the vehicle theft determination process is terminated without issuing an alarm.

  In S5 to S7, when all of the sensor signals (angle signal θ, height signal H, pressure signal P) sent from the three sensors exceed the threshold values θs, Hs, Ps, the vehicle 30 However, it may be determined that the vehicle 30 is not stolen when two sensor signals out of the three sensors exceed the threshold value.

Next, vehicle theft determination processing will be described by taking, as an example, a case where the vehicle 30 is suspended and carried without permission by a tow truck or the like, and a case where the vehicle 30 parked in the three-dimensional parking lot is tilted together with the pallet 50. .
As shown in FIG. 5, when the front F of the vehicle 30 is suspended in the direction of the white arrow shown in FIG. 5 and carried without permission by a tow truck or the like, the vehicle 30 rises forward with respect to the ground contact surface G of the tire 32. Tilt. Along with this, the vehicle weight is removed from the front wheel 32a, so the pressure signal P1 of the front wheel 32a detected by the tire pressure sensor 13 is greatly reduced from the initial value Pi during parking.
Further, since the weight of the vehicle body decreases from the suspension 33 and is pulled in the direction of gravity by the weight of the front wheel 32a floating in the air (in the direction of the black arrow shown in FIG. 5), the height signal H1 detected by the height sensor 12 is It greatly changes from the initial value Hi.
Therefore, since S5 to S7 processed by the determination unit 24 are all YES, it is determined that the vehicle 30 has been stolen.
The same applies to the case where the rear B of the vehicle 30 is suspended and carried without permission.

On the other hand, as shown in FIG. 6, when the vehicle 30 parked in the multi-story parking lot is inclined with respect to the horizontal plane G <b> 1 together with the pallet 50, the vehicle 30 is the same as when the front F of the vehicle 30 is suspended by the above-described tow truck. Suppose that is inclined upward. Here, unlike the case where the front of the vehicle 30 is suspended by a tow truck or the like, since the vehicle weight is still loaded on the front wheel 32a, the height signal H1 and the pressure signal P1 hardly change. Therefore, in S5 to S7 processed by the determination unit 24, since only S5 is YES, it is determined that the vehicle 30 is not stolen.
In other words, when the vehicle 30 parked is tilted due to an event other than theft, if the vehicle theft determination device 1 includes only the tilt sensor 11, the two events cannot be distinguished. In the embodiment, the tilt state of the vehicle 30 can be detected in more detail by combining sensor signals of sensors that can detect a change in the behavior state associated with the tilt of the vehicle 30. For this reason, the change in the inclination of the vehicle 30 caused by theft and the change in the inclination of the vehicle 30 caused by other events can be distinguished, and there is no possibility of erroneously detecting the theft of the vehicle 30.

[Effect of the embodiment]
(1) As described above, according to the invention of the present embodiment, the behavior state of the parked vehicle 30 can be detected by the inclination sensor 11, the height sensor 12, and the tire pressure sensor 13. When only the sensor 11 is provided, it is possible to distinguish and detect a change in the behavior state of the vehicle 30 that is erroneously detected as being stolen and a change in the behavior state of the vehicle 30 due to the theft.
That is, the vehicle theft determination device 1 that prevents erroneous detection can be realized.

(2) In order to determine the theft of the vehicle 30 by comparing the difference values Δθ, H, P of the sensor signals with the initial values θi, Hi, Pi and the threshold values θs, Hs, Ps by the determination unit 24. The theft of the vehicle 30 can be determined easily and reliably. Also, the determination accuracy can be easily improved by optimizing the threshold values θs, Hs, and Ps.

<Other embodiments>
(1) The sensor provided in the vehicle theft determination device 1 may be two types of sensors selected from the inclination sensor 11, the height sensor 12, and the tire pressure sensor 13. For example, it is good also as a structure provided with two types of sensors, the inclination sensor 11 and the height sensor 12, except the tire pressure sensor 13 from the structure shown in FIG. In this case, the process regarding the tire pressure sensor 13 is omitted from the vehicle theft determination process shown in FIG. Specifically, the pressure signal is not acquired in the processes of S2 and S3, and the process proceeds to the process of S8 without performing the process of S7 after the process of S6.
When this configuration is used, as shown in FIG. 5, when the vehicle 30 is suspended forward by a tow truck or the like and carried without permission, the weight of the vehicle body is reduced from the suspension 33, and the weight of the front wheel 32a floating in the air is reduced. Since it is pulled in the direction of gravity, the height signal H1 detected by the height sensor 12 changes greatly from the initial value Hi during parking. On the other hand, as shown in FIG. 6, when the vehicle 30 parked in the multi-story parking lot is tilted forwardly with the pallet 50, the vehicle 30 is tilted forwardly, but the height signal H <b> 1 hardly varies. Therefore, since the height signal H of the height sensor 12 is different, both events can be distinguished.

(2) The sensor provided in the vehicle theft determination device 1 may be configured to include two types of sensors, the inclination sensor 11 and the tire pressure sensor 13, except for the height sensor 12, from the configuration illustrated in FIG. Good. In this case, the process regarding the height sensor 12 is omitted from the vehicle theft determination process shown in FIG. Specifically, the height signal is not acquired in the processes of S2 and S3, and the process proceeds to the process of S7 without performing the process of S6 after the process of S5.
When this configuration is used, as shown in FIG. 5, when the front of the vehicle 30 is suspended by a tow truck and carried without permission, the vehicle 30 tilts forward and is detected by the tire pressure sensor 13. The pressure signal P1 of 32a is greatly reduced from the initial value Pi during parking. On the other hand, as shown in FIG. 6, when the vehicle 30 parked in the multi-story parking lot is tilted forwardly with the pallet 50, the vehicle 30 is tilted forwardly, but the pressure signal P <b> 1 hardly varies. Therefore, since the pressure signal P of the tire pressure sensor 13 is different, both events can be distinguished.

(3) The sensor provided in the vehicle theft determination device 1 may include two types of sensors, that is, the height sensor 12 and the tire pressure sensor 13 except for the inclination sensor 11 from the configuration illustrated in FIG. Good. In this case, the process regarding the inclination sensor 11 is abbreviate | omitted from the vehicle theft determination process shown in FIG. Specifically, the angle signal is not acquired in the processes of S2 and S3, and the process proceeds to the process of S6 without performing the process of S5 after the process of S4.
When this configuration is used, as shown in FIG. 5, when the front of the vehicle 30 is suspended by a tow truck and carried without permission, the vehicle 30 tilts forward and is detected by the tire pressure sensor 13. The pressure signal P1 of 32a is greatly reduced from the initial value Pi during parking. Further, since the weight of the vehicle body decreases from the suspension 33 and is pulled in the direction of gravity by the weight of the front wheel 32a floating in the air, the height signal H1 detected by the height sensor 12 greatly changes from the initial value Hi during parking. To do. On the other hand, as shown in FIG. 6, when the vehicle 30 parked in the multi-story parking lot tilts forward with the pallet 50, the vehicle 30 tilts forward but changes in the pressure signal P <b> 1 and the height signal H <b> 1. There is almost no. Therefore, since the pressure signal P of the tire pressure sensor 13 and the height signal H of the height sensor 12 are different, both events can be distinguished.

(4) Also, as shown in FIG. 7, the height sensor 12 can be any of the front and rear (F, B) direction, the left and right (L, R) direction, and the diagonal (C1, C2) direction on the arrangement of the tire 32. You may provide with respect to the two or more suspensions 33 in the position. Further, the tire pressure sensor 13 includes two or more tires 32 located at any position in the front-rear (F, B) direction, the left-right (L, R) direction, and the diagonal (C1, C2) direction on the arrangement of the tires 32. May be provided.
For example, the height sensor 12 is provided for each of the suspensions 33 provided on the right front side and the left rear side, that is, the suspensions 33 at diagonal positions on the tire 32 arrangement. Further, the tire pressure sensor 13 is provided for each of the tires 32 provided at the left front and right rear.
That is, the height sensor 12 and the tire pressure sensor 13 are provided in different diagonal directions on the arrangement of the tires 32, and the height sensor 12 or the tire pressure sensor 13 is provided at positions corresponding to all four tires 32. Provide.
Even when this configuration is used, since the sensor signal sent from the position where the height sensor 12 or the tire pressure sensor 13 is installed does not exceed the threshold values Hs and Ps, it is not determined that the vehicle has been stolen. Can be prevented from being erroneously detected as having been stolen even though it has not been stolen. Since two or more height sensors 12 or tire pressure sensors 13 are provided, even if one sensor fails, the remaining sensors can send out sensor signals.
Furthermore, it is possible to detect changes in the height signal H and the pressure signal P corresponding to changes in the inclination of the vehicle 30 in all the front, rear, left and right directions, and the accuracy of the vehicle theft determination device 1 can be improved. Further, if at least two height sensors 12 are provided, it is possible to detect a change in the distance between the vehicle body 31 and the tire 32 in response to a change in behavior state in all the front, rear, left and right directions of the vehicle. The number of sensors 12 can be reduced. Similarly, if at least two tire pressure sensors 13 are provided, a change in tire pressure can be detected in response to a change in behavior state in all the front, rear, left, and right directions of the vehicle, so the number of tire pressure sensors 13 provided is reduced. can do.

(5) The inclination sensor 11, the height sensor 12, and the tire pressure sensor 13 operate intermittently so as to operate only for a predetermined period for detecting the behavior state of the parked vehicle and sending it as a sensor signal. You may let them. For example, each sensor may be operated after the process of S1 and stopped after the processes of S2 and S3. When this configuration is used, power consumption for operating the sensor can be reduced.

[Correspondence between each claim and embodiment]
The sensor signal acquisition unit 21 corresponds to the sensor signal acquisition unit according to the first aspect, the initial value setting unit 22 corresponds to the initial value setting unit, the comparison unit 23 corresponds to the comparison unit, and the determination unit 24 corresponds to the determination unit.

It is a block diagram which shows the structure of a vehicle theft determination apparatus. It is explanatory drawing which shows arrangement | positioning of an inclination sensor, a height sensor, and a tire pressure sensor. It is explanatory drawing of the piston rod of the spring which comprises a suspension, and a shock absorber. It is a flowchart which shows the vehicle theft determination process by a vehicle theft determination apparatus. It is explanatory drawing of the vehicle lifted ahead with the tow truck. It is explanatory drawing of the vehicle inclined with the pallet parked in the multilevel parking lot. It is explanatory drawing which shows the example of a change of arrangement | positioning of a height sensor and a tire pressure sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle theft determination apparatus 11 Inclination sensor 12 Height sensor 13 Tire pressure sensor 21 Sensor signal acquisition part (sensor signal acquisition means)
22 Initial value setting section (initial value setting means)
23 Comparison part (comparison means)
24 determination unit (determination means)
30 vehicles
31 Car body 32 Tire 33 Suspension 33a Shock absorber 33b Piston rod 33c Spring θ Angle signal H Height signal P Pressure signal

Claims (8)

A vehicle theft determination device provided in a vehicle, comprising two or more types of sensors capable of detecting a behavior state of a parked vehicle and sending it as a sensor signal,
Sensor signal acquisition means for acquiring each sensor signal sent from the two or more types of sensors;
Initial value setting means for setting each sensor signal first obtained by the sensor signal obtaining means after parking the vehicle as an initial value;
Comparison means for comparing each initial value set by the initial value setting means and each sensor signal acquired by the sensor signal acquisition means this time;
Determination means for determining whether or not the vehicle is stolen based on the comparison result by the comparison means;
I have a,
As the two or more types of sensors,
An inclination sensor capable of detecting the inclination of the vehicle and transmitting an angle signal based on the inclination;
Detecting a stroke amount of at least one of a piston rod and a spring of a shock absorber constituting a suspension of the vehicle, and transmitting a height signal corresponding to a distance between the vehicle body of the vehicle and the tire of the vehicle based on the stroke amount. A height sensor that can
Vehicle theft determination apparatus characterized by comprising a. A vehicle theft determination device provided in a vehicle, comprising two or more types of sensors capable of detecting a behavior state of a parked vehicle and sending it as a sensor signal,
Sensor signal acquisition means for acquiring each sensor signal sent from the two or more types of sensors;
Initial value setting means for setting each sensor signal first obtained by the sensor signal obtaining means after parking the vehicle as an initial value;
Comparison means for comparing each initial value set by the initial value setting means and each sensor signal acquired by the sensor signal acquisition means this time;
Determination means for determining whether or not the vehicle is stolen based on the comparison result by the comparison means;
Have
As the two or more types of sensors,
An inclination sensor capable of detecting the inclination of the vehicle and transmitting an angle signal based on the inclination;
A tire pressure sensor individually provided in the tire, capable of detecting a tire air pressure and sending a pressure signal based on the air pressure;
Car both theft determination device you comprising the. A vehicle theft determination device provided in a vehicle, comprising two or more types of sensors capable of detecting a behavior state of a parked vehicle and sending it as a sensor signal,
Sensor signal acquisition means for acquiring each sensor signal sent from the two or more types of sensors;
Initial value setting means for setting each sensor signal first obtained by the sensor signal obtaining means after parking the vehicle as an initial value;
Comparison means for comparing each initial value set by the initial value setting means and each sensor signal acquired by the sensor signal acquisition means this time;
Determination means for determining whether or not the vehicle is stolen based on the comparison result by the comparison means;
Have
As the two or more types of sensors,
Detecting a stroke amount of at least one of a piston rod and a spring of a shock absorber constituting a suspension of the vehicle, and transmitting a height signal corresponding to a distance between the vehicle body of the vehicle and the tire of the vehicle based on the stroke amount. A height sensor that can
A tire pressure sensor individually provided in the tire, capable of detecting a tire air pressure and sending a pressure signal based on the air pressure;
Car both theft determination device you comprising the. A vehicle theft determination device provided in a vehicle, comprising two or more types of sensors capable of detecting a behavior state of a parked vehicle and sending it as a sensor signal,
Sensor signal acquisition means for acquiring each sensor signal sent from the two or more types of sensors;
Initial value setting means for setting each sensor signal first obtained by the sensor signal obtaining means after parking the vehicle as an initial value;
Comparison means for comparing each initial value set by the initial value setting means and each sensor signal acquired by the sensor signal acquisition means this time;
Determination means for determining whether or not the vehicle is stolen based on the comparison result by the comparison means;
Have
As the two or more types of sensors,
An inclination sensor capable of detecting the inclination of the vehicle and transmitting an angle signal based on the inclination;
Detecting a stroke amount of at least one of a piston rod and a spring of a shock absorber constituting a suspension of the vehicle, and transmitting a height signal corresponding to a distance between the vehicle body of the vehicle and the tire of the vehicle based on the stroke amount. A height sensor that can
A tire pressure sensor individually provided in the tire, capable of detecting a tire air pressure and sending a pressure signal based on the air pressure;
Car both theft determination device you comprising the. 5. The vehicle theft determination device according to claim 1, wherein the inclination sensor is provided in the vicinity of an intersection of diagonal lines on a tire arrangement in a four-wheeled vehicle. Said height sensor according to claim, characterized in that provided respectively with respect to the longitudinal direction, two or more of the suspension in any position in the horizontal direction and the diagonal direction on the tire arrangement in a four-wheeled vehicle The vehicle theft determination device according to claim 1, claim 3 or claim 4 . Said tire pressure sensor, the longitudinal direction on the tire arrangement in a four-wheeled vehicle, according to claim, characterized in that provided for two or more of the tire in any position in the horizontal direction and the diagonal direction 2 The vehicle theft determination device according to any one of claims 4 to 4 . The determination means determines that the vehicle has been stolen when a difference between each of the initial values and each of the sensor signals exceeds a predetermined threshold value. The vehicle theft determination device according to any one of the above.

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