JPH08175331A - Vehicular anti-theft system - Google Patents

Abstract

PURPOSE: To provide a vehicular anti-theft system which issues alarms for any abnormal states of a vehicle by driving an alarm means differently depending on whether the vehicle is stolen or moved by a wrecker. CONSTITUTION: This vehicular anti-theft system 1 is provided with a key position detection means 3 for detecting the off position of an ignition key 2, stroke detection means 6, 7 for detecting the amounts of strokes of suspensions 4, 5, vehicle speed sensors 8, 9 for detecting vehicle speed, and an alarm means 10 that issues alarms in a plurality of different states, etc. The system 1 also has a control means 17 which causes operation of the alarm means 10 in a first state if the amounts of strokes are detected to be at a predetermined value or higher with the ignition key 2 in the off position and with the vehicle 13 detected to have been stopped on the basis of the outputs of the vehicle speed sensors 8, 9, and which causes the alarm means 10 to operate in a second state if the amounts of strokes are detected to be at the predetermined value or higher with the vehicle 13 detected to be running on the basis of the outputs of the vehicle speed sensors 8, 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device used for a vehicle, and more particularly to an anti-theft device which gives an alarm by distinguishing between the time when a wheel is stolen and the time when the vehicle is moving.

[0002]

2. Description of the Related Art In recent years, a vehicle alarm system called a theft alarm device or an antitheft device has been proposed for the purpose of preventing theft of wheels and vehicles. For example, JP-A-3-800
Japanese Patent Publication No. 1 discloses a wheel theft alarm device that alarms a wheel theft by driving an alarm means such as a horn according to an output from a vehicle height sensor that detects the distance between the vehicle and the wheel. In this wheel theft alarm device, a vehicle height sensor is arranged in the vicinity of each wheel to detect the distance between each wheel and the vehicle when the vehicle is not traveling, and the alarm means is sounded according to the detection result.

[0003]

According to the above-mentioned wheel theft alarm device, since the driving of the alarm means is performed by the distance between the wheel and the vehicle in the stopped state, for example, a wrecker caused by a parking violation or the like. Even when the vehicle is moved, only an alarm in the same manner as when the wheel is stolen can be issued, and it is impossible to distinguish between the case where the wheel is stolen and the vehicle movement. The purpose of the present invention is to
It is an object of the present invention to provide a vehicle antitheft device that warns an abnormal state of a vehicle by driving an alarm means in different modes when a wheel is stolen and when the vehicle is moved by a wrecker or the like.

[0004]

Therefore, in the invention according to claim 1, the stroke detecting means detects that the stroke amount of the suspension is a predetermined value or more when the ignition key is in the off state, and the vehicle speed When it is detected that the vehicle is in the stopped state based on the output of the detected vehicle speed sensor, the alarm means is activated in the first mode, it is detected that the stroke amount is equal to or more than a predetermined value, and the output of the vehicle speed sensor is detected. Based on the control means for activating the alarm means in the second mode when it is detected that the vehicle is running,
It controls the alarm means. In the invention according to claim 2, the alarm means is constituted by a transmitter mounted on the vehicle and a portable receiver, and the control means is arranged so that the portable receiver operates in the first mode or the second mode. The transmitter is controlled by. Claim 3
In the invention described above, the control means activates the alarm means a predetermined time after the ignition key is turned off.

[0005]

According to the first aspect of the present invention, the stroke detecting means detects that the stroke amount of the suspension when the ignition key is in the off state is equal to or more than a predetermined value, and the vehicle speed is detected based on the output of the vehicle speed sensor. When in the stopped state, the alarm means is operated in the first mode, and when the stroke detection means detects that the stroke amount of the suspension is equal to or more than a predetermined value when the ignition key is in the off state, the output of the vehicle speed sensor is detected. Based on this, when the vehicle is in a traveling state, the alarm means is activated in the second mode,
Different alarms are issued when the vehicle is stopped and when the vehicle is running. According to the invention described in claim 2, the alarm means is composed of a transmitter mounted on the vehicle and a portable receiver, and the control means is a transmitter so that the receiver is driven in the first mode or the second mode. Since the vehicle is controlled by the driver, the driver can carry the receiver to directly know the situation of the vehicle even when the vehicle is away from the vehicle. According to the third aspect of the present invention, since the alarm means is kept inactive for a predetermined time after the ignition key is turned off by the control means, the suspension of the suspension within a predetermined time immediately after the ignition key is turned off. The activation of the alarm means due to the change is released.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The vehicle anti-theft device shown by reference numeral 1 in FIG. 1 is a key switch 3 as a key state detecting means for detecting that an ignition key 2 is in an off state, and a stroke detection for detecting a stroke amount of front and rear suspensions 4, 5. A front stroke sensor 6 and a rear stroke sensor 7 as means, vehicle speed sensors 8 and 9 for detecting a vehicle speed, a horn 10 as an alarm means for issuing an alarm in a plurality of mutually different modes,
And a control means 11 for controlling the horn 10. The key switch 3 is connected to the control means 1 from the power source 12.
The current to 1 is turned on / off. When the key switch 3 is closed, it is turned on, and when it is opened, it is turned off.

The front stroke sensor 6 and the rear stroke sensor 7 are cross members 4A and 5 fixed to the vehicle 13.
Each of the lower arms 4A and 5B has a well-known configuration in which the lower arm 4B and the lower arm 4B are connected to each other via a lever and a rod (not shown).
The displacement amounts of B and 5B are detected. The front stroke sensor 6 and the rear stroke sensor 7 include the lower arms 4B and 5
An output corresponding to the displacement amount of B is input to an engine control unit (hereinafter referred to as “ECU”) 17 that constitutes the control means 11 via the waveform conversion circuit 16. The front stroke sensor 6 and the rear stroke sensor 7 are shown in FIG.
As shown in (a), a linear characteristic is adopted in which the resistance value is changed in proportion to the detected stroke amount corresponding to the vehicle height, and the output is linearly changed in proportion to the resistance value. .

The waveform conversion circuit 16 secondarily analyzes the sensor output signals from the front stroke sensor 6 and the rear stroke sensor 7, changes them into a quadratic curve as shown in FIG. It is input as a controller output signal. The waveform conversion circuit 16 converts the outputs from the front and rear stroke sensors 6 and 7 indicated by the chain double-dashed line in FIG.
The sensitivity of 7 has a margin.

Because the amplitudes of the output signals from the stroke sensors 6 and 7 are not constant, as shown in FIG.
Subtle pulsation occurs due to slight vibrations of the suspensions 4 and 5. When such a pulsation occurs, the output signal becomes higher than the output signal corresponding to the actual vehicle height indicated by the chain double-dashed line, so that the actual vehicle height H is lower than the actual vehicle height H1. The output is equivalent to. Even if the scale is an output signal with many errors in which subtle pulsation is generated by the slight vibration of the suspensions 4 and 5 by passing through the waveform conversion circuit 16, the output signal corresponding to the actual vehicle height is a quadratic curve. The pulsation becomes relatively low by being converted into, and the output due to the pulsation becomes an output corresponding to the actual vehicle height H at the position of the vehicle height h2 lower than the actual vehicle height H. That is, assuming that the interval between H and h1 is L and the interval between H and h2 is L1, the sensor outputs are corrected by L-L1 by passing the outputs from the stroke sensors 6 and 7 through the waveform conversion circuit 16, and It will be close to the output corresponding to the vehicle height. This means that the responsiveness of the stroke sensor is secured and at the same time the error in the sensor output is reduced.

The vehicle speed sensors 8 and 9 have front wheels 14 respectively.
Is arranged near the rear wheel 15 and the front and rear wheels 1
When 4, 15 are rotating, the rotation is detected and the ECU 1
7 is input as a speed signal. The ECU 17 is composed of a well-known microcomputer, in which an output value (resistance value) corresponding to a predetermined suspension stroke amount is set, and an alarm program I shown in FIG. 7 is stored. According to this program, different command signals are output to the drive means 18 depending on whether the vehicle 13 is stopped or running. The horn 10 is connected to the drive means 18 and is operated by a drive signal from the drive circuit 18.

The operation of the vehicle antitheft device 1 having such a configuration will be described with reference to the alarm program I shown in FIG. First, when the ignition key 2 is turned off and the key switch 3 is turned off in step S1,
In step S2, the alarm system goes into the monitoring state,
If the key switch 3 is not turned off, it is determined that there is a person in the vehicle 13 and the alarm program I is not activated.

In steps S3 and S4, the outputs from the stroke sensors 6 and 7 are compared with the set values stored in the ECU 17, and the ON signals from the vehicle speed sensors 8 and 9 are seen. At this time, if the output from the stroke sensors 6 and 7 has not reached the set value, the monitoring state is maintained, the output from either one becomes the set value, and the on-signal from either one of the vehicle speed sensors 8 and 9 is turned on. Is input, the process proceeds to step S5, it is determined that the vehicle 13 is in an unnatural movement state (for example, wrecker movement), a command signal is sent to the drive means 18, and the horn 10 which is an alarm means is operated in the second mode. The horn 10 emits an alarm sound until the ON signals from the vehicle speed sensors 8 and 9 disappear in step 6, that is, until the unnatural movement of the vehicle 13 disappears. When the ON signals from the vehicle speed sensors 8 and 9 disappear, step S
7, the drive circuit 18 is stopped and the alarm sound from the horn 10 is stopped. In the second aspect of the horn 10, the command signal is intermittently sent from the ECU 17 to the drive circuit 18, and the horn 1
The alarm sound emitted by 0 is sounded intermittently.

On the other hand, when only the outputs from the stroke sensors 6 and 7 are input and reach the set value, step S
8 and judges that the wheels 14 and 15 are stolen, and sends a command signal to the driving means 18 to issue a horn 10 as an alarm means.
In the first mode, the horn 10 emits an alarm sound until the outputs from the stroke sensors 8 and 9 disappear in step S9, that is, until the wheel theft operation ends. When the output from the stroke sensors 6 and 7 falls below the set value, the process proceeds to step S7, the drive circuit 18 is stopped, and the alarm sound from the horn 10 is stopped. In the first mode of the horn 10, a command signal is continuously sent from the ECU 17 to the drive circuit 18, and an alarm sound emitted by the horn 10 is continuously emitted. Next, in step S10, it is determined whether or not the key switch 3 is turned on, and the ignition key 2 is turned on, that is, when the key is inserted into the vehicle 13, the alarm system is turned off.

As described above, when the outputs of only the stroke sensors 6 and 7 and the outputs of the stroke sensors 6 and 7 and the vehicle speed sensors 14 and 15 are emitted, the horn 10 is sounded in a different manner, so that the wheels 14 and 15 are stolen. It is possible to discriminate whether the warning is due to or due to an unnatural movement of the vehicle 13. In this case, the horn 1 is used as an alarm means.
Although 0 is set in two different modes, in addition to this, a headlight or the like indicated by reference numeral 19 in FIG. 1 may be connected to the drive circuit 18 to light in two different modes.

Next, an alarm means is provided as a transmitter 20 and a receiver 21.
The second embodiment constituted by will be described. Since the configuration other than the transmitter 20 and the receiver 21 is the same as that of the first embodiment, it will be described with reference to FIG. The transmitter 20 is connected to the drive circuit 18 and is provided near the rear of the vehicle 13, and emits radio waves in two different modes according to different drive signals from the drive means 18. The receiver 21 is a portable receiver typified by a so-called pager or the like, and when receiving radio waves of two different modes from the transmitter 20, emits different alarm sounds at the time of reception of each radio wave. It is designed to inform the wearer.

FIG. 8 shows the operation of the second embodiment having such a configuration.
Explain. In FIG. 8, the area in which the rear stroke sensor and the vehicle speed sensor are in the on state indicates an unnatural movement state of the vehicle due to wrecker movement, and the area in which only the stroke sensor is in the on state is the wheel 1
4, the stolen state is shown. The state of the vehicle 13 in the area shown in FIG. 8 shows a state in which the rear portion of the vehicle is lifted because the R stroke sensor is operating, and the vehicle speed sensor is outputting, so that the vehicle 1 of the rear-wheel drive type is shown.
3 is a pattern detected when the wrecker 3 moves or the like. If the front stroke sensor and the vehicle speed sensor are activated, it means that the vehicle is traveling with the front portion thereof being lifted, and therefore the pattern is detected when the tow truck is moved in the case of a front-wheel drive vehicle. In this way, the transmitter 20 and the receiver 21 are used as the alarm means, and radio waves are emitted in different modes depending on the state of the vehicle 13 to activate the receiver 21, so that the driver away from the vehicle is notified of the state of the vehicle 13. be able to.

Next, a third embodiment will be described. Third
In the embodiment, the timer circuit 23 is provided in the ECU 17 shown in FIG.
Is provided, and the alarm system is activated after a certain time has elapsed since the key switch 3 was turned off. In this embodiment, the alarm program II stored in the ECU 17, the indicator 22 and the timer circuit 2 are stored.
Since the configuration other than 3 is the same as that of the first and second embodiments, the description thereof will be omitted.

The timer circuit 23 is designed to open the circuit for a set time when the key switch 3 is turned off, and does not send an off signal of the key switch 3 to the ECU 17. The indicator 22 is connected to the ECU 17 via the timer circuit 23 and is lit while the timer circuit 23 is operating. EC
In U17, an alarm program II and an alarm means operating time are set.

The operation of the third embodiment having such a configuration is shown in FIG.
An explanation will be given according to the alarm program II shown in 0. When the key switch 3 is turned off in step R1, the process proceeds to step R2, the timer circuit 23 is activated, the indicator 22 lights up, and the process proceeds to step R3. Step R3
Then, the operating time of the timer circuit 23 can be seen, and when the set time is reached, the alarm system is put into a monitoring state. When the stroke sensor is turned on in step R5, step R
When the key switch 3 is turned on in step R7, the alarm means is activated in step 6, and the alarm means is deactivated in step R8. If the key switch 3 is still in the off state in step R7, the process proceeds to step R9, and the alarm means is operated for a predetermined time set, and then step R
Proceed to step 8 to stop the alarm means.

In this way, after the key switch 3 is turned off, that is, after the ignition key 2 shown in FIG. 9 is turned off to turn it off, the alarm system shown in FIG. By providing a certain blank time, it is possible to prevent malfunction of the alarm system due to displacement of the stroke sensor when getting on or off the vehicle 13 or when loading or unloading a load. Examples of the alarm means in this embodiment include the horn 10, the headlight 19 or the transmitter 20 and the portable receiver 21 shown in the first and second embodiments. In this embodiment, the alarm means is simply turned on / off, but the alarm program I shown in FIG. 7 is supplemented with steps R2, R3 and R9.
Of course, it may be stored in the ECU 17 as III and controlled to activate the alarm means.

[0021]

According to the first aspect of the present invention, the alarm means is activated in different modes when the vehicle is stopped and when the vehicle is running, so that the wheels and the vehicle can be effectively prevented from being stolen. According to the second aspect of the present invention, even if the driver carries the receiver with him, he can directly know the situation of the vehicle even when he is away from the vehicle. According to the third aspect of the present invention, since the alarm means is kept inactive for a predetermined time after the ignition key is turned off by the control means, the suspension within a predetermined time immediately after the ignition key is turned off. The operation of the alarm means due to the change of the alarm is released, and the malfunction of the alarm means due to getting on and off the vehicle or loading and unloading luggage can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vehicle antitheft device showing an embodiment of the present invention.

2A is a diagram showing an output characteristic of a stroke sensor, and FIG. 2B is a diagram showing an output characteristic of a waveform conversion circuit.

FIG. 3 is a block diagram showing a main part of the first embodiment.

FIG. 4 is a diagram comparing an output from a stroke sensor and an output characteristic from a waveform conversion circuit.

FIG. 5 is a diagram showing characteristics of an output signal from a stroke sensor.

FIG. 6 is a diagram showing characteristics of an output signal from the waveform conversion circuit.

FIG. 7 is a flowchart showing an example of an alarm program in the first embodiment.

FIG. 8 is a timing chart in the second embodiment of the present invention.

FIG. 9 is a timing chart in the third embodiment of the present invention.

FIG. 10 is a flowchart of an alarm program II used in the third embodiment.

[Explanation of reference numerals] 1 anti-theft device for vehicle 2 ignition key 3 key state detecting means 4, 5 suspension 6,7 stroke detecting means 8, 9 vehicle speed sensor 10 alarm means (horn) 17 control means 19 alarm means (headlight) 20 alarm means (transmitter) 21 alarm means (receiver) 22 indicator 23 timer circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihide Tanaka 4-21-1, Shimomaruko, Ota-ku, Tokyo ・ Inside Mitsubishi Motors Engineering Co., Ltd. (72) Inventor Yujiro Matsumura 4-21-1, Shimomaruko, Ota-ku, Tokyo・ In Mitsubishi Motors Engineering Co., Ltd.

Claims (3)

[Claims] 1. A key state detecting means for detecting that an ignition key is in an off state, a stroke detecting means for detecting a stroke amount of a suspension, a vehicle speed sensor for detecting a vehicle speed, and an alarm in a plurality of mutually different modes. And a warning means for issuing a warning, and when the ignition key is in an off state, it is detected that the stroke amount is a predetermined value or more, and
When it is detected that the vehicle is in a stopped state based on the output of the vehicle speed sensor, the alarm means is activated in the first mode, it is detected that the stroke amount is equal to or more than a predetermined value, and A vehicle anti-theft device comprising: a control means for activating the alarm means in a second mode when it is detected that the vehicle is running based on the output. 2. The alarm means includes a transmitter mounted on a vehicle and a portable receiver, and the control means uses the portable receiver according to the first aspect or the second aspect. The anti-theft device for a vehicle according to claim 1, wherein the transmitter is controlled to operate. 3. The anti-theft device for a vehicle according to claim 1, wherein the control means activates the alarm means a predetermined time after the ignition key is turned off.