JP4556843B2 - Vehicle antitheft device - Google Patents

Description

  The present invention relates to a vehicle antitheft device, and more particularly to a vehicle antitheft device that changes conditions for generating an alarm based on the expansion and contraction of a suspension and the inclination angle of the vehicle.

  2. Description of the Related Art Conventionally, there is a vehicle antitheft device that generates an alarm based on information from an inclination sensor or the like and prevents the vehicle from being stolen.

  However, the vehicle antitheft device using the tilt sensor may cause a malfunction due to the tilt of the parking lot when the vehicle is parked on a slope, a ferry to sail, or a multilevel parking lot. In addition, a vehicle antitheft device using a vibration sensor may cause malfunction due to vibration when heavy rain, strong wind, or a large heavy machine passes nearby.

Therefore, some of the anti-theft devices for vehicles use an anti-theft mechanism by monitoring the stroke position of the shock absorber in the suspension device and operating the anti-theft mechanism when it is detected that the shock absorber is in a substantially full stroke state. There is known a device that prevents theft of a vehicle while preventing malfunction due to vibration or vibration (see, for example, Patent Document 1).
JP-A-63-078848

  However, in the antitheft device for a vehicle described in Patent Document 1, since the antitheft mechanism does not operate until the vehicle is lifted and the shock absorber is in a substantially full stroke state, the vehicle height is lowered by the vehicle height adjusting suspension. There is a problem that even if the vehicle is jacked up, the vehicle cannot be applied to a vehicle in which the tow truck may be moved without the shock absorber being in a full stroke state.

  In view of the above problems, an object of the present invention is to provide a vehicle antitheft device that reliably detects a theft without causing the antitheft mechanism to malfunction.

  In order to achieve the above object, a vehicle antitheft device according to a first aspect of the present invention includes a vehicle height state detection unit that detects a vehicle height state, a vehicle inclination angle detection unit that detects a vehicle inclination angle, and the vehicle Alarm generating means for generating an alarm when the high state detecting means detects a predetermined vehicle height state of the vehicle and the vehicle inclination angle detecting means detects a predetermined inclination angle; To do.

  According to a second aspect of the present invention, there is provided the vehicle antitheft device according to the first aspect, wherein the vehicle height state detecting means detects the predetermined vehicle height state based on expansion and contraction of a suspension. To do.

  A third invention is the vehicle antitheft device according to the first invention, wherein the predetermined inclination angle is set based on the predetermined vehicle height state detected by the vehicle height state detecting means. It is characterized by that.

  According to a fourth aspect of the present invention, there is provided a vehicle antitheft device comprising: vehicle posture detecting means for detecting a vehicle inclination angle and vehicle height based on expansion and contraction of a suspension; and the vehicle posture detecting means is a predetermined vehicle of the vehicle. And an alarm generation means for generating an alarm when a high state is detected and a predetermined inclination angle is detected.

  According to the present invention, it is possible to provide a vehicle antitheft device that reliably detects a theft without causing the antitheft mechanism to malfunction.

  Hereinafter, the best mode for carrying out the present invention will be described in several embodiments with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration example of a vehicle antitheft device. The vehicle antitheft device 100 includes a security control unit 1, a door opening / closing detection device 2, a tilt sensor 3, an alarm device 4, and a suspension expansion / contraction displacement sensor 5.

  The security control unit 1 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory) (not shown), and includes a vehicle height state detection unit 10, an alarm generation unit 11, and a vehicle inclination angle detection unit 12. Have The security control unit 1 expands the program stored in the ROM to the RAM and causes the CPU to execute the above means. The security control unit 1 is connected to a door opening / closing detection device 2, a tilt sensor 3, an alarm device 4, and a suspension expansion / contraction displacement sensor 5.

  The door opening / closing detection device 2 detects opening / closing of the door of the vehicle and transmits a detection signal to the security control unit 1.

  The tilt sensor 3 is a sensor that reacts to the tilt of the vehicle due to jack-up or wrecker or the swing of the vehicle, and detects the tilt or swing from the state in the horizontal or vertical direction.

  The alarm device 4 is a device that generates a sound or light for alarm, and may include a transmitter that transmits a signal to a remote control terminal, a mobile phone, or the like.

  The suspension extension / displacement displacement sensor 5 measures the displacement of the vehicle height and the length of the suspension based on the displacement of the length of the shock absorber and the coil spring, the change of the pressure of the air suspension, and the like.

  The vehicle height state detection means 10 acquires information on expansion / contraction of each suspension from the suspension expansion / contraction displacement sensor 5 in the suspension corresponding to each of the four wheels, and detects a predetermined vehicle height state. Further, the vehicle height state detection means 10 has a predetermined vehicle height based on information such as other distance sensors using infrared rays or ultrasonic waves and a setting state of a vehicle height adjustment switch of a vehicle height control device provided in the vehicle interior. A state may be detected.

  The “predetermined vehicle height state” refers to a vehicle height set by a vehicle height adjustable suspension or the like, for example, “HI” indicating a high vehicle height, “NORMAL” indicating a standard vehicle height, or a low vehicle height. There are three stages of “LOW” indicating The vehicle height state detection means 10 can determine the vehicle height state from the expansion and contraction of the suspension. The “predetermined vehicle height state” may have three or more vehicle height states. For example, when the right front and rear suspensions extend to a predetermined length, the left front suspension It may have a slope, such as when is extended to a predetermined length.

  The alarm generation means 11 transmits a signal to the alarm device 4 on the basis of the signal from the door opening / closing detection device 2 or the detection result of the vehicle height state detection means 10 or the vehicle inclination angle detection means 12, and the alarm device 4 issues a warning sound. Etc.

  The vehicle inclination angle detection means 12 receives a signal from the inclination sensor 3 and detects the inclination of the vehicle. The vehicle inclination angle detection means 12 detects the biaxial inclination of the vehicle in the front-rear direction and the left-right direction, but may detect only the uniaxial inclination.

  Next, the operation of the vehicle antitheft device 100 will be described. FIG. 2 is a flowchart showing a flow of processing in which the vehicle antitheft device 100 issues an alarm. First, the security control unit 1 of the vehicle antitheft device 100 receives a signal from the door opening / closing detection device 2, and based on the information on whether all the vehicle doors are locked, the vehicle antitheft device 100. It is determined whether or not the anti-theft mechanism is activated (step 1). If all the doors are locked, the anti-theft mechanism is activated (YES in step 1). The antitheft mechanism may be operated based on information from the ignition switch or based on signals from the door opening / closing detection device and the ignition switch. If all the doors are not locked, or if the ignition switch is on, the driver is still in the vicinity of the vehicle, so the anti-theft mechanism should not be activated (NO in step 1). .

  During the operation of the anti-theft mechanism, the security control unit 1 monitors the signal from the tilt sensor 3 (step S2), and when the vehicle tilt angle detecting means 12 detects a predetermined tilt angle (YES in step S2), security control is performed. The unit 1 determines whether or not the expansion and contraction of the suspension is equal to or greater than the threshold (step S3). If the expansion and contraction of the suspension is equal to or greater than the threshold (YES in step S3), an alarm is generated so that the alarm device 4 generates a warning sound. The means 11 is caused to transmit a signal. When the expansion / contraction of the suspension is less than the threshold value (NO in step S3), the alarm generation unit 11 is not allowed to transmit a signal. This is because the suspension is not expanded or contracted by jack-up or the like, but is thought to be caused by ground shaking or strong wind. The threshold value can be set in advance in consideration of the suspension state such as a vehicle height state, and the setting can be changed. Further, the setting of the predetermined inclination angle detected by the vehicle inclination angle detecting means 12 may be changed according to the state of the suspension.

  This prevents the anti-theft mechanism from malfunctioning by tilting the vehicle in the event of an earthquake or strong wind, or by shaking the ground during ferry boarding or parking in a multilevel parking lot. In the case of theft of a vehicle, a tire, or a vehicle part by an up or a tow truck, an alarm can be appropriately issued. As a result, the trouble of manually turning off the anti-theft mechanism when parking on a ferry or in a multi-story parking lot, and then turning on the switch again when the anti-theft mechanism is required is eliminated. Moreover, when the anti-theft mechanism is required, it is possible to prevent a situation where the anti-theft mechanism has forgotten to operate.

  FIG. 3 is a flowchart showing another processing flow in which the vehicle antitheft device issues an alarm, and particularly shows a processing flow in a vehicle equipped with a vehicle height adjustable suspension.

  Since step S11 and step S12 are the same as the process shown in FIG. 2, description is abbreviate | omitted.

  The security control unit 1 determines the vehicle height based on information from the suspension expansion / contraction displacement sensor 5 (step S13). Here, it is assumed that there are three levels of vehicle height, “HI”, “NORMAL”, and “LOW”.

  When the security control unit 1 determines that the vehicle height is in the “HI” state based on the degree of expansion and contraction of the suspension, the alarm generation unit 11 transmits a signal to the alarm device 4 as a condition “vehicle measured by the tilt sensor 3”. Is set to be greater than or equal to θ1 (step S14).

  Further, when it is determined that the vehicle height is in the “NORMAL” state, the condition that the alarm generating means 11 transmits a signal to the alarm device 4 is that “the inclination angle of the vehicle measured by the inclination sensor 3 is not less than θ2. Is set (step S15), and when it is determined that the vehicle height is in the “LOW” state, the alarm generation means 11 transmits a signal to the alarm device 4 as a condition for “the vehicle inclination measured by the inclination sensor 3”. “An angle is equal to or larger than θ3” is set (step S16). Note that θ1, θ2, and θ3 satisfy the relationship θ1 <θ2 <θ3. This is due to the nature of the suspension, and details are given below.

  FIG. 4 is a table showing the relationship between the vehicle height state, the displacement of the suspension and the vehicle inclination angle necessary for lifting the tire when jacking up.

The “vehicle height state” column 20 has three states of “HI”, “NORMAL”, and “LOW”. The “displacement of the suspension until the tire floats when jacking up” column 21, “the tire is The “vehicle inclination angle until floating” column 22 indicates the displacement of the suspension and the vehicle inclination angle in each vehicle height state in three stages of “large”, “medium”, and “small”. When the vehicle height is “HI”, “ displacement of suspension until the tire floats when jacking up” and “vehicle inclination angle until the tire floats when jacking up” are the smallest in the three vehicle height states, and the vehicle height state Is “LOW”, “the suspension displacement until the tire floats when jacking up” and “the vehicle inclination angle until the tire floats when jacking up” are the largest in the three vehicle height states. Further, the “inclination angle (threshold value) when issuing an alarm” column 22 indicates the threshold value of the inclination angle in each vehicle height state, and the smallest angle in the three vehicle height states when the vehicle height state is “HI”. Is θ1, and θ3 is the largest angle in the three vehicle height states when the vehicle height state is “LOW”. The threshold of the inclination angle is the largest angle θ3 in the three vehicle height states when the vehicle height state is “LOW”, but the shock absorber becomes a full stroke when the vehicle height state is “LOW”. Therefore, the alarm device 4 can be appropriately operated in the case of theft, while reliably preventing the malfunction of the alarm device 4.

When the vehicle height adjustable suspension is set so that the vehicle height is high, such as “HI”, the shock absorber is extended from the standard in the steady state (1G state). Therefore, the “ displacement of the suspension until the tire floats when jacking up” is small, and therefore “the vehicle inclination angle until the tire floats when jacking up” is also small. On the other hand, when the vehicle height is set to a low state such as “LOW”, the shock absorber is contracted from the reference in the steady state, and the elongation until reaching the full stroke state is “NORMAL”. As compared with the case of “HI” and “HI”, the “ displacement of the suspension until the tire floats when jacking up” is large, so the “vehicle inclination angle until the tire floats when jacking up” is also large.

  In this way, when the vehicle height state is “NORMAL” or “LOW”, the tire cannot be lifted unless the vehicle is tilted more than in the case of “HI”. The angle can be set larger than when it is “HI” to prevent the malfunction more reliably.

  In the second embodiment, the vehicle height state has three stages of “HI”, “NORMAL”, and “LOW”, but the vehicle height state may be two stages or four or more stages.

  FIG. 5 is a diagram illustrating a configuration example of the vehicle antitheft device according to the third embodiment. Here, the same components as those of the vehicle antitheft device 100 shown in FIG. 1 have the same reference numerals.

  The vehicle antitheft device 200 includes a security control unit 1, a door opening / closing detection device 2, an alarm device 4, and a suspension expansion / contraction displacement sensor 5, and the security control unit 1 includes an alarm generation unit 11 and a vehicle attitude detection unit 13. .

  In the vehicle antitheft device according to the first and second embodiments, when the vehicle inclination angle detection unit 12 detects a vehicle inclination angle that exceeds the threshold based on the information of the inclination sensor 3, the alarm device 4 issues an alarm. In the vehicle antitheft device 3, the suspension expansion / contraction displacement sensor 5 detects the vehicle height state and the vehicle inclination angle and issues an alarm without using the inclination sensor 3.

  The vehicle posture state detection means 13 acquires information on the expansion and contraction of each suspension from the suspension expansion / contraction displacement sensor 5 in the suspension corresponding to each of the four wheels, and detects the vehicle posture and the vehicle height state.

  Here, the vehicle posture refers to a vehicle inclination angle determined from the expansion and contraction of the suspension of each of the four wheels. For example, the vehicle posture detection means 13 is configured such that the front wheel suspension is contracted from a reference length or the rear wheel When the suspension of the vehicle is extended beyond the reference length, it can be determined that the front part of the vehicle is pushed down at a certain inclination angle or the rear part of the vehicle is lifted at a certain inclination angle. Further, the vehicle height state detection means 10 has an inclination angle with the right side of the vehicle when the right and left front and rear wheel suspensions are contracted from the reference length or the left and right front and rear wheel suspensions are extended from the reference length. It is possible to determine that the vehicle has been pushed down at a certain angle, or that the vehicle left side has been lifted at a certain inclination angle. The reference length refers to the length of the suspension when the vehicle is not tilted in the vehicle height state set by the vehicle height-adjustable suspension (all in the 1G state) or the length of the suspension during parking.

  The alarm generation means 11 transmits a signal to the alarm device 4 based on the signal from the door opening / closing detection device 2 and the detection result of the vehicle posture detection means 13 to generate an alarm sound or the like from the alarm device 4.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, it is a condition that the alarm is generated when the vehicle inclines at a predetermined inclination angle, but the time during which the inclination angle equal to or greater than the predetermined inclination angle is maintained is taken into consideration. The alarm may be prevented from malfunctioning due to a temporary inclination generated on the ferry.

It is a figure (the 1) which shows the structural example of the antitheft device for vehicles. It is a flowchart (the 1) which shows the flow of the process in which a vehicle antitheft device issues an alarm. It is a flowchart (the 2) which shows the flow of the process in which the vehicle antitheft device issues an alarm. It is a table | surface figure which shows the relationship between a vehicle height state, the displacement of a suspension until a tire floats at the time of jackup, and a vehicle inclination angle. It is FIG. (2) which shows the structural example of the antitheft device for vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Security control part 2 Door opening / closing detection apparatus 3 Inclination sensor 4 Alarm 5 Suspension expansion / contraction displacement sensor 10 Vehicle height state detection means 11 Alarm generation means 12 Vehicle inclination angle detection means 13 Vehicle attitude detection means 20 "Vehicle height state" column 21 " Displacement of suspension until the tire floats when jacking up ”column 22“ Vehicle tilt angle until the tire floats when jacking up ”column 23“ Tilt angle when issuing an alarm (threshold) ”column 100, 200 Vehicle antitheft device

Claims (3)

Vehicle height state detecting means for detecting a vehicle height state;
Vehicle inclination angle detection means for detecting the inclination angle of the vehicle;
Alarm generating means for generating an alarm when the vehicle height state detecting means detects a predetermined vehicle height state of the vehicle and the vehicle inclination angle detecting means detects a predetermined inclination angle ;
The predetermined inclination angle is set based on the predetermined vehicle height state detected by the vehicle height state detection means.
The antitheft device for vehicles characterized by the above-mentioned.   2. The vehicle antitheft device according to claim 1, wherein the vehicle height state detecting unit detects the predetermined vehicle height state based on expansion and contraction of a suspension. Vehicle posture detection means for detecting the vehicle tilt angle and vehicle height based on the expansion and contraction of the suspension;
Alarm generating means for generating an alarm when the vehicle posture detecting means detects a predetermined vehicle height state of the vehicle and detects a predetermined inclination angle ;
The predetermined inclination angle is set based on the predetermined vehicle height state detected by the vehicle posture detection means .
The antitheft device for vehicles characterized by the above-mentioned.

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