JP3484214B2 - Vehicle anti-theft device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antitheft device for a vehicle, such as a motorcycle or a four-wheeled vehicle, which controls the ignition system to prevent theft of the vehicle.

[0002]

2. Description of the Related Art Conventionally, as a device for preventing the theft of a vehicle, for example, a device disclosed in Japanese Patent Publication No. 61-40577 is known. This device consists of a steering lock device that prevents normal operation of the vehicle by removing the key, a switch element that closes when the steering lock device is destroyed or removed, and a fuse connected between the power supply and the ignition device. And one end of the switch element is connected to ground and the other end is connected between the fuse and the ignition device. When the steering lock device is broken or removed, a current flows from the power supply to the fuse to melt the fuse, making it impossible to start the engine.

By the way, in this device, even if the steering lock device is broken or removed and the fuse is blown, the blown circuit is short-circuited by an appropriate conductive member, or the blown fuse is normally operated. If the fuse is replaced with an appropriate fuse, the ignition device operates normally and the engine can be started. In particular, many vehicles are equipped with a spare fuse, and the function of the fuse can be easily restored even by a person without electrical knowledge. There is a problem that the engine can be started relatively easily and a sufficient antitheft effect cannot be obtained.

Therefore, in order to solve such a problem, the applicant of the present invention has found that, in the anti-theft unit having a control circuit, a sealing circuit, etc., one capacitor of an ignition device, for example, a capacitor of a CDI unit. We have applied for an anti-theft device that takes in a diode for charging and shuts off the ignition device by sealing the rectifying function of this diode with a sealing circuit when an abnormality occurs in the ignition switch. (See No. 5-97206).

[0005]

However, in this anti-theft device, it has become clear that the battery of the vehicle is likely to run out and the user's burden of maintenance on the vehicle increases. In other words, the anti-theft unit, when an abnormality occurs in the ignition switch,
In order to immediately activate the sealing circuit and deactivate the ignition device, it is necessary to constantly supply power from the battery to the sealing circuit and the like when parking. As a result, when the vehicle is parked for a long time, the power of the battery is consumed and the battery is likely to run out, although there is no abnormality.
This shortens the life of the battery and increases the burden of maintenance on the vehicle of the user.

The present invention has been made in view of such circumstances, and an object thereof is to provide an antitheft device for a vehicle, which can prevent the battery of the vehicle from running down and reduce the maintenance load on the vehicle by the user. To provide.

[0007]

In order to achieve the above object, a vehicle antitheft device according to a first aspect of the present invention comprises a switch mechanism for opening and closing a power supply path from a power supply to an ignition device by operating a key, and a vehicle operation. An ignition switch having a lock mechanism for limiting the direction, and a sensor for detecting an abnormality of at least one of the switch mechanism and the lock mechanism, and an electrically rewritable semiconductor memory, and data stored in the memory. An antitheft unit that seals the function of at least one component of the ignition device based on an abnormal signal from the sensor and deactivates the ignition device, the component being an ignition switch and an antitheft device. Incorporated into at least one of the units,
The anti-theft unit must be at least the ignition switch.
Note when the vehicle switch is off and the vehicle is parked
After writing the specified data to the
It is characterized in that the power supply to the unit can be cut off before the vehicle is about to be operated .

The antitheft device according to claim 2 is
An ignition switch having a switch mechanism for opening and closing a power supply path from a power source to an ignition device by operating a key, a lock mechanism for limiting steering of a vehicle, and a sensor for detecting an abnormality of at least one of the switch mechanism and the lock mechanism, It has an electrically rewritable semiconductor memory,
An anti-theft unit that seals the function of at least one component of the ignition device to deactivate the ignition device based on the data stored in the memory and the abnormal signal from the sensor, and from the power supply. comprising opening and closing means for opening and closing the power supply path to the anti-theft unit, said memory, said
When the opening / closing means is closed, the specified data is stored and
It is characterized in that the power supply is cut off in the state .

Further, the antitheft device according to claim 3 is:
A control circuit to which a predetermined input signal from the input device and an abnormal signal from the ignition switch are input, a sealing circuit that controls the function of at least one component of the ignition device by the control signal of the control circuit, and a control of the control circuit The control circuit includes an electrically rewritable semiconductor memory that stores data according to an input signal by a signal and can store and maintain data when power supply to the control circuit is cut off. Is supplied, the function of the component incorporated in at least one of the ignition switch and the sealing circuit is sealed by the sealing circuit based on the data and the abnormal signal stored in the memory. To do.

[0010]

According to the vehicle antitheft device according to the first aspect of the present invention, the parts of the ignition device incorporated in the ignition switch or the antitheft unit function in a normal state under the control of the antitheft unit to function to ignite. Ready the equipment. The semiconductor memory of the anti-theft unit is composed of an electrically rewritable memory, for example, an ignition switch is turned off.
Writing predetermined data to the memory while the vehicle is parked
Is Migana, while the data is stored, the power supply to the anti-theft unit is cut off.

Then, try to drive the vehicle again
At this time, if the ignition switch is destroyed or removed and an abnormal signal is input to the anti-theft unit, the anti-theft unit will store the abnormal signal and the memory in the memory when the power is supplied to the unit. Based on the stored data, the functions of the components of the ignition device are sealed, the ignition device is deactivated and the engine cannot be started.
As a result, the supply of power to the anti-theft unit is stopped during parking, so that the battery of the vehicle is prevented from running down.

Further, according to the anti-theft device of the second aspect, the anti-theft unit has the power supply path opened / closed by the opening / closing means, for example, the power is supplied when the opening / closing means is "closed" so that the predetermined data is transmitted. It is stored in the semiconductor memory. When the opening / closing means is "open", the power supply to the anti-theft unit is cut off, but the data stored in the memory is maintained. Then, when power is supplied to the anti-theft unit, the functions of the parts of the ignition device are sealed based on the data in the memory and the abnormal signal from the sensor to deactivate the ignition device and start the engine. Make impossible. This eliminates the need to constantly supply power to the anti-theft unit and prevents the battery from running down.

Further, according to the anti-theft device of the third aspect, the control circuit stores the data corresponding to the input signal from the input device in the semiconductor memory while the power is supplied. The memory stores and maintains data even when the power supply to the control circuit is cut off. When the power is supplied again, the control circuit compares the data stored in the memory with the signal from the ignition switch, and when the abnormal signal is input from the ignition switch, the control circuit Output a control signal. The sealed circuit uses this signal to shut off a part of the circuit,
Encapsulates the function of parts of the ignition device. As a result, it is not necessary to keep the control circuit and the sealing circuit in an operable state at all times, and the battery exhaustion is prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a circuit diagram of an anti-theft device according to the present invention. In FIG. 1, the anti-theft device 1 is
Ignition switch 3 connected to battery 2
And an antitheft unit 5 and the like connected to the ignition device 4.

The ignition switch 3 has contacts S1 and
Switch mechanism 6 having S2 (both are make contacts)
It has a destruction sensor 7, a detachment sensor 8 and the like.
The contact point S1 is connected between the charge coil 10 of the magneto 9 and the anode of a diode 12 which will be described later.
Is connected between the battery 2 and the load 13 such as a turn signal and the anode of the diode 14.

As shown in FIG. 2, the switch mechanism 6 has the contacts S1, S2 and the like arranged in the switch body 15, and the contacts S1, S2 rotate following the rotation of the key 16. It is turned on and off by a shaft 17 that rotates. A lead wire (not shown) is connected to each of the contacts S1, S2, etc., and is led out of the switch body 15.

A board 18 having a pattern as the destruction sensor 7 is disposed in the switch body 15, a plate 19 for mounting the ignition switch 3 on the vehicle body, and a lower cover 1 of the switch body 15.
A detachment sensor 8, for example, a micro switch or the like is provided between the detachment sensor and 5a. The destruction sensor 7 is configured, for example, using the pattern of the substrate 18 as a contact, and outputs a signal when the pattern of the substrate 18 is broken or connected due to destruction of the ignition switch 3 or the like. The removal sensor 8 is made up of, for example, a make contact, and outputs an ON signal when the ignition switch 3 is removed. The lead wires 20 and 21 are connected to the pattern of the substrate 18 and the detachment sensor 8 and are led out to the outside of the switch body 15.

The ignition switch 3 is provided with a lock mechanism 23 for locking the steering. The lock mechanism 23 is fitted on the upper part of the switch body 15 so as to be vertically movable, and has a lower end connected to the shaft 17 and a rotor 24.
It has a rotating cam 25, and a lock bar 26 which advances and retreats in the direction of arrow A in FIG. 2 when the cam 25 rotates.

Then, the ignition switch 3
Is held at three positions, for example, "LOCK", "OFF", and "ON" by inserting the key 16 from the key insertion opening 27 on the upper part of the rotor 24 and rotating the rotor 24. The "LOCK" position is a position where the key 16 is pulled out from the ignition switch 3, that is, a position where, for example, the vehicle is parked, and the lock bar 26 of the lock mechanism 23 is at the handle shaft 2 at this position.
It projects to the 8 side. Then, the lock bar 26 is engaged with a lock plate (not shown) fixed to the handle shaft 28, and rotation of the handle shaft 28 is prohibited, that is, steering is locked.

Further, the ignition switch 3 "OF"
The "F" position is, for example, a position where the vehicle can be moved without starting the engine, and the "ON" position is that power is supplied to each steering system and control system and the engine is started by a start button (not shown). It is a position that can be made. At the “OFF” and “ON” positions, the lock bar 26 does not project to the handle shaft 28 side. The ignition switch 3 is an example of a motorcycle, and in the case of a four-wheeled vehicle, for example, "LOCK", "ACC", "ON",
It is configured to be held in four positions of "ST".

As shown in FIG. 1, the anti-theft unit 5 includes, for example, a CPU 31 (control circuit) composed of an 8-bit microcomputer and an EE as a semiconductor memory.
PROM (Electrically Erasable)
e and Programmable ROM) 3
2. It has a sealing circuit 33 and the like. The CPU 31 is composed of a data memory (RAM), a program memory (ROM), a logical operation circuit (ALU), and the like (not shown), and based on signals input from the keyboard 34, the breakage sensor 7, the removal sensor 8, and the like, the EEPROM 32 and The sealing circuit 33 is controlled.

The input terminal (not shown) of the CPU 31 has an ignition switch 3 and a switch 46 described later.
ON / OFF signal of each is input and CP
A keyboard 34 as an input device is connected to U31. This keyboard 34 has six number keys 34a.
And the reset key 34b, etc., and the keyboard 3
A diode 35 for protection is arranged in the inside of 4.
Although the anti-theft unit 5 and the keyboard 34 are arranged in the lower part of the seat, the helmet box, the dash box, etc., which are not shown, they may be arranged in the same place or in different places. May be. However,
In the following description, the anti-theft unit 5 and the keyboard 34 will be described as being arranged under the seat of the motorcycle (vehicle).

The EEPROM 32 is an electrically erasable and erasable EEPROM, which has a memory capacity of 2 Kbits, for example.
It is composed of a ROM. The EEPROM 32 writes data input from the keyboard 34 by a control signal of the CPU 31, stores and maintains this data even when the power supply to the CPU 31 is cut off, and stores the stored data in the CPU 31. It is rewritten by the control signal of.

The sealing circuit 33 has a pair of transistors 36 and 37 whose bases are respectively connected to the output terminals of the CPU 31, and the collector of the transistor 36 is
The relay 38 is connected to one end of a coil 38a, and the collector of the transistor 37 is connected to one end of a relay 39 coil 39a. The emitter of the transistor 36 is grounded via the diode 40 and the fuse 41, and the connection point of the diode 40 and the fuse 41 is connected to one end of the contact S3 (make contact) of the relay 39 via the resistor 42. ing. The fuse 41 blows when an abnormality occurs as described later, but instead of the fuse 41, for example, another electronic component (transistor, fuse resistor, etc.) that is easily destroyed by a current of a predetermined value or more can be used.

The other end of the coil 39a of the relay 39 and the other end of the contact S3 are connected to the cathode of the diode 43 and the cathode of the diode 44 connected to the power supply terminal of the CPU 31. The other end of the coil 38 a of the relay 38 is connected to the anode of the diode 43. The anode of the diode 43 is connected to the contact S2 of the switch mechanism 6 via the diode 14 and to the anode side of the battery 2 via the switch 46 as an opening / closing means.

The switch 46 is installed in the lower part of the seat of the vehicle, and is automatically turned on / off by raising and lowering the seat to open / close the power supply path from the battery 2 to the anti-theft unit 5. A diode 12, which is a component of the ignition device 4, is arranged in the sealing circuit 33, and a contact S4 (break contact) of the relay 38 is connected in parallel to both ends of the diode 12. ON of this contact S4
When turned off, the rectifying function of the diode 12 is controlled.

The ignition device 4 is a CDI (Capaciti).
v Discharge Ignition) unit 50, and has a thyristor 51 whose anode is connected to the cathode of the diode 12 in the sealing circuit 33. A diode 52 for protecting the thyristor 51 is connected in the reverse direction between the anode and the cathode of the thyristor 51. A resistor 53 is connected between the gate and the cathode of the thyristor 51, and a capacitor 54 and a resistor 55 are connected in series between the gate and the pulsar coil 11 of the magneto 9.

A primary coil 57a of an ignition coil 57 is connected to the anode of the thyristor 51 via a capacitor 56 for ignition. As a result, the charge coil 10 of the magneto 9 and the ignition coil 57 are electrically connected via the contact S1, the diode 12 (contact S4), and the capacitor 56 of the ignition switch 3. A spark plug 58 is connected to the secondary coil 57b of the ignition coil 57. The battery 2, the charge coil 10, the pulsar coil 11, the ignition coil 57, the spark plug 58 and the like have one ends connected to the vehicle body and grounded.

Next, an example of the operation of the anti-theft device 1 will be described with reference to the flow charts of FIGS.
FIG. 3 is a flowchart showing the operation procedure of the driver,
The solid line A shows the procedure when the anti-theft unit 5 is set, and the solid line B shows the case where the anti-theft unit 5 is not set. A dotted line C indicates that the CPU 31 in the anti-theft unit 5 operates.

First, the driver stops the vehicle and turns off the ignition switch 3 (S100). When the anti-theft unit 5 is set, the seat is lifted and the switch 46 is turned on (S101). When the switch 46 is turned on, power is supplied from the battery 2 to the anti-theft unit 5, and the unit 5 operates as described later. In this state, the keyboard 34 is used to input predetermined data (S102). As this data, a code number (for example, a four-digit number) and data indicating the set state of the anti-theft unit 5 (hereinafter, this data is referred to as set data. In the case of the set state, “Yes”, the set state is released. In the initial state, the data will be "none".

By this input operation, as will be described later, E
Data is written in the EPROM 32, and the anti-theft unit 5 is set. Then, when the input is completed, the seat is lowered to turn off the switch 46 (S103), and the power supply to the anti-theft unit 5 is cut off. In this state, the vehicle is parked, and power is not supplied to the anti-theft unit 5 during this parking, but the EEPROM 32 is
The written data is stored and maintained.

When the vehicle is to be driven again, the seat is lifted and the switch 46 is turned on (S104). As a result, power is supplied to the anti-theft unit 5 again, the unit 5 operates, and as described later, the CP
U31 checks the state of the destruction sensor 7 and the removal sensor 8 and if there is no abnormality, a predetermined data (for example, a code number and release data of the set state, that is, "none") is input from the keyboard 34 arranged at the bottom of the seat. (Data, etc.) is input (S105). By this input, EE
The data in the PROM 32 is rewritten, the set state of the anti-theft unit 5 can be released, and the vehicle can run (J200). On the other hand, if there is an abnormality, it becomes impossible to cancel the inoperable state (J300) as described later. Step 100 above
107 is a procedure of the driver when the anti-theft unit 5 is used, and is applied particularly when parking for a long time.

On the other hand, when it is not necessary to use the anti-theft unit 5 such as parking for a short time or parking in a garage at home, the ignition switch 3 is turned off at step 100 and is left as it is. Park in this condition. When the vehicle is driven, the ignition switch 3 is turned on (S108) so that the vehicle can travel (J200). In this way, the vehicle can be driven when the anti-theft unit 5 is released from the set state (however, the destruction sensor 7 and the detachment sensor 8 are normal) and when the anti-theft unit 5 is not set. There are two ways.

Next, the operation of the CPU 31 according to the procedure of the driver in this flowchart will be described with reference to FIGS. 4 and 5. The CPU 31 basically operates by being supplied with power from the battery 2 depending on whether the switch 46 is turned on in steps 101 and 104 of FIG. 3 or the ignition switch 3 is turned on in steps 107 and 108. The flowcharts of FIGS. 4 and 5 are executed by a program stored in a program memory (ROM) in the CPU 31.

When power is supplied to the CPU 31 and the program is started (S200), the CPU 31 first sets the EE
The data stored in the PROM 32 is read (S2
01). After that, it is determined whether the destruction sensor 7 and the removal sensor 8 are normal (S203). This step 203
Is an ON / OFF signal input from the destruction sensor 7 and the removal sensor 8 and data of the destruction sensor 7 and the removal sensor 8 read from the EEPROM 32 (hereinafter, this data is referred to as sensor data, for example, the EEPROM is previously stored.
32 are set in the CPU 32) and are compared in the CPU 31.

If "YES" in the step 202, that is, if there is no abnormality in the breakage sensor 7 and the removal sensor 8,
It is determined whether or not the ignition switch 3 is off (S20
3) Do. This step 203 is the anti-theft unit 5
In the case of "YES", the power is supplied through the switch 46, and in the case of "NO", the power is supplied through the ignition switch 3.

When the power is supplied by turning on the switch 46, the result in step 203 is "YES", and the set data among the read data is "present".
It is determined whether or not (S204). If “NO” in this step 204, that is, if the anti-theft unit 5 is not set (when the set data is “none”), the data input by the keyboard 34 is changed to EEPRO.
Write to M32 (S207) and terminate the program (S
209). As a result, step 102 of FIG. 3 is executed.

On the other hand, if “YES” in the step 204, that is, if the data is already set in the anti-theft unit 5 (when the set data is “present”), it is determined whether or not the recitation number is input from the keyboard 34. Judge whether (S
205) Yes. This step 205 is repeated until the recitation number is input. When the password is entered, E
The number read from the EPROM 32 is compared, and it is determined whether the numbers match (S206).

If "YES" in this step 206,
That is, when the input number matches the stored number, the input data is newly written in the EEPROM 32 based on the set release data input from the keyboard 34 (S207). At this time, EEPROM3
The data stored in 2 is collectively rewritten, for example, for each byte, and the EEPROM 32 returns to the initial state with the set data being "none", and the program ends (S209). This results in step 105 of FIG.
Will be executed.

If "NO" in step 206,
That is, if the input number does not match the stored number, the program is immediately terminated (S209). In this case, the data in the EEPROM 32 is not rewritten and remains in the set state so that the vehicle cannot run. Therefore, if the input recitation number is forgotten when the anti-theft unit 5 is set, steps 200 to 209 are repeated again, and if the numbers match, the set state of the anti-theft unit 5 is released. In this way, by returning the EEPROM 32 to the initial state, that is, by setting the set data to "none", the vehicle can run.

If "NO" in step 202,
That is, the ignition switch 3 is operated by a third party while parked.
When the signal input to the CPU 31 from the destruction sensor 7 and the removal sensor 8 is different from the read sensor data due to destruction or removal of the CPU 3, the CPU 3
1 determines that this state is an abnormal state, and outputs a signal (hereinafter referred to as signal B) to the transistor 37 of the sealing circuit 33 (S208). At this time, the CPU 31 determines that there is an abnormal state when at least one input signal of the destruction sensor 7 and the removal sensor 8 does not match the sensor data.
The signal B causes the sealing circuit 33 to operate as follows, and deactivates the CDI unit 50.

That is, when the signal B is output from the CPU 31 to the base of the transistor 37, the transistor 37 is turned on, and the coil 39a of the relay 39 is supplied with current from the battery 2 via the switch 46 and the diode 43. . The relay 39 is turned on by this current and the contact S
3 is closed, a predetermined current is supplied to the fuse 41 via the resistor 42, and the fuse 41 is blown. Fuse 41
When is blown, the transistor 36 cannot be turned on and the relay 38 is not excited. As a result, the contact S4 of the relay 38 is always closed and the diode 1
The rectifying function of 2 is sealed so that the ignition capacitor 56 of the CDI unit 50 is not charged and the CDI unit 50 is not charged.
Cannot operate but is in an inactive state.

The non-operating state of the CDI unit 50 is semipermanently maintained because the switch mechanism 6 or the lock mechanism 23 is destroyed and the fuse 41 is melted and the sealing circuit 33 does not function. Will be done. To recover from this state, the fuse 41 of the anti-theft unit 5 is replaced, the password is entered in the EEPROM 32, the stored data is rewritten, or the anti-theft unit 5 is replaced with a new one and the destruction sensor 7 and the detachment sensor 8 are returned to a normal state.

In this step 208, even if the ignition switch 3 is destroyed or removed by a third party during parking, the sealed circuit 3 is still present at that time.
3 does not work. However, power is supplied from the battery 2 to the anti-theft unit 5 by raising the seat and automatically turning on the switch 46, or by bypassing the portion corresponding to the contact S2 of the ignition switch 3. At this point, the sealing circuit 33 is activated and the fuse 4
1 melts, that is, the sealed circuit 33 self-destroys.

Next, in the case of "NO" in step 203,
That is, the operation when the ignition switch 3 is turned on to drive the vehicle will be described with reference to FIG.
When the ignition switch 3 is turned on, first, in order to confirm safety, it is determined whether or not the switch 46 is turned off (S210). Since the switch 46 is off when the vehicle is about to travel, step 21
When it becomes 0, it becomes “YES”, and the transistor 3 of the sealing circuit 33
A signal (hereinafter referred to as signal A) is output to 6 (S211).

This signal A turns on the transistor 36 of the sealing circuit 33. By turning on the transistor 36, current is supplied from the battery 2 to the coil 38a of the relay 38, the relay 38 is turned on, and the contact S4 is opened. open.
As a result, the short-circuited state of both ends of the diode 12 is released, and the diode 12 becomes a state in which it can function, that is, a state in which rectification can be performed.

In this state, when the ignition switch 3 is rotated to the "ON" position and the start button is pressed to rotate the magneto 9, a voltage is generated in the charge coil 10, and this voltage is applied to the contact S1 of the ignition switch 3. Is supplied to the diode 12 via. In addition,
The voltage generated in the charge coil 10 is an AC voltage having a frequency according to the number of poles of the magneto 9.

The alternating voltage supplied to the diode 12 is
It is rectified into a DC voltage, and the capacitor 56 of the CDI unit 50 is charged to a predetermined voltage. Capacitor 56
When the magnet 9 is further rotated and the ignition timing is reached after being charged, a pulse is generated from the pulsar coil 11.
This pulse is supplied to the gate of the thyristor 51 via the resistor 55 and the capacitor 54, and the thyristor 51 is turned on.

When the thyristor 51 is turned on, the electric charge stored in the capacitor 56 is rapidly discharged to the primary coil 57a of the ignition coil 57, and the coil 57 is discharged.
A high voltage is generated in the secondary coil 57b. This voltage causes a discharge in the spark plug 58 and ignites the engine. The CDI unit 50 repeats this operation. Note that the CPU 31 always outputs the signal A while the vehicle is traveling to turn on the transistor 36 and turn on the diode 1
Keep 2 functional. Then, when the vehicle is stopped and the ignition switch 3 is turned off (S212), the program ends (S209).

By the way, in the flow chart of FIG. 3, even when the anti-theft unit 5 is not set, when the ignition switch 3 is turned on in step 108, the CPU 31 operates and the steps of FIGS. 4 and 5 are executed. . In this case, since the EEPROM 32 is in the initial state after the data is rewritten, and the ignition switch 3 is normal, step 202 is performed.
Then it becomes "YES". Then, in step 203, "N
It becomes "O", and the process proceeds to step 210 and thereafter. This allows the vehicle to run.

The above flow chart is an example, and various modifications can be made. For example, when the fuse 41 is blown, the CPU 31 may be made to store the situation such as the blowing time, and the number is designated at step 206. If the numbers do not match, the program may be re-inputable a predetermined number of times (for example, three times). Also, the EEPROM 32 used
Depending on the performance, the data set for each byte, for example, only the set data may be rewritten without collectively rewriting the data. In this case, the EEPROM 32 always stores the recitation number and the sensor data. However, even when the anti-theft unit 5 is not set, the sealing circuit 33 can be self-destructed due to an abnormality of the sensor.

As described above, in the above embodiment, when the vehicle is parked, the ignition switch 3 is turned off, the antitheft unit 5 is set, and the seat is lowered. Since the power supply to 5 is automatically cut off, the electric power of the battery 2 is not consumed during parking, and the battery exhaustion is reliably prevented. According to the experiment, in the conventional device that constantly supplies the power to the anti-theft unit, the battery will run out in 2 to 3 weeks. It has been confirmed that the battery will not run out for a period of several tens of times. As a result, the life of the battery 2 is extended, and the user's burden of maintenance on the vehicle such as regeneration and replacement of the battery 2 is reduced.

Further, a battery for operating the CPU 31 at all times is not required, and the cost of the product can be reduced. In particular, this type of battery is expensive, the ratio to the product cost is large, the overall cost including the replacement frequency is high, and the price is decreasing.
32 is cheaper.

Further, by raising and lowering the seat, the switch 46 is automatically turned on / off to control the power supply to the anti-theft unit 5, so that the anti-theft unit 5 is set and unset. Can be done easily. Also, since it is possible to select whether to set the anti-theft unit 5 or not, it is not necessary to set the anti-theft unit 5 when it is not necessary to set it as in the case of short-time parking or parking in a home garage. Will be easier.

Further, even if the destruction sensor 7 and the removal sensor 8 are destroyed and removed by a third party (thief thief) during parking, the anti-theft unit 5 does not change at that time, and the bypass circuit or the like is not changed. Depending on whether the ignition switch 3 is turned on or the seat is lifted and the switch 46 is turned on.
3 is activated, the fuse 41 is blown, and the CDI unit 50 is deactivated. As a result, even if a third party tries to drive the vehicle, the engine cannot be started, the vehicle cannot be easily moved, and the third party may feel emotional pressure. it can.

In particular, once the anti-theft unit 5 is activated, the CDI unit 50 cannot be activated only by replacing the fuse 41 in the anti-theft unit 5. That is, the EEPRO of the anti-theft unit 5
M32 stores the data set by the driver even if the power supply is cut off, and unless the data is rewritten, the anti-theft unit 5 itself does not operate normally. Therefore, for example, even if the fuse 41 of the sealing circuit 33 is replaced and the power supply path is connected, the sealing circuit 33 is activated again at the time of connection, and the fuse 41 is blown.

Further, it is difficult for a person having electrical knowledge to create a bypass circuit that allows the diode 12, which is a component of the CDI unit 50, to function normally, and it is a prescribed standard that allows normal operation. The diode 12
It is also difficult to get it immediately on the spot. From the above, it is extremely difficult for a third party to restore the anti-theft unit 5 that has been activated to a normal state, and the anti-theft effect can be sufficiently enhanced.

Furthermore, the anti-theft unit 5 can be constructed in a small size, and since the diode 12, which is a relatively small component, need only be attached to the anti-theft unit 5, it can be easily mounted on a vehicle such as a motorcycle. Thus, the antitheft device 1 having high versatility can be obtained, in particular, it can be easily mounted as an option even on a vehicle already on the market. Further, even if the vehicle is stolen, as described above, the situation at the time of the theft or the like is stored in the CPU 31 of the anti-theft unit 5, or the sale or repair of the anti-theft unit 5 is restricted. This makes it easier to find a stolen vehicle and helps arrest the thief.

In the above embodiment, the ignition device 4
Although the case where the CDI unit 50 is used has been described above, the present invention is not limited to this, and a well-known transistor type ignition circuit (not shown) may be used, for example. In this case, one of the transistors in the ignition circuit is taken into the sealing circuit 33, and the contact S4 of the relay 38 is connected in parallel between the emitter and collector of this transistor.

In the transistor, the emitter and the collector are short-circuited by the contact S4, and normally the function thereof, that is, the switching operation is sealed. Then, when the contact S4 is opened by the operation of the relay 38, the switching operation becomes possible. Even if configured in this manner, in addition to the same effect as the above-described embodiment, in order to return the antitheft unit 5, more electrical knowledge than the knowledge of the diode 12 is required, and the antitheft effect is further enhanced. The effect that can be obtained is also obtained.

In the above embodiment, the diode 12, which is a component of the CDI unit 50, is incorporated in the anti-theft unit 5, but it may be incorporated in the ignition switch 3, or the anti-theft unit 5 and the ignition switch. You may take in both of the three.
Further, a plurality of components of the CDI unit 50 may be incorporated in the anti-theft unit 5 or the ignition switch 3. Further, in the above embodiment, the break contact S4 of the relay 38 is connected in parallel to the diode 12, but, for example, the make contact of the relay 38 is connected to the diode 12.
Even if it is connected in series, the same effects as those of the above embodiment can be obtained. Further, a semiconductor element such as a power transistor may be used instead of the relays 38 and 39.

Although the EEPROM 32 is used as the electrically writable semiconductor memory in the above embodiment, another semiconductor memory such as a flash memory may be used. Furthermore, although the keyboard 34 is used as the input device of the anti-theft unit 5, an input device that can use, for example, an ID card may be used. Further, the contact configuration of the ignition switch 3, the configuration of the breakage sensor 7 and the removal sensor 8, the configuration of the anti-theft unit 5, the configuration of the sealing circuit 33, the configuration of the ignition device 4 and the like in the above embodiment are merely examples. Needless to say, various modifications can be made without departing from the scope of the present invention.

[0063]

As described above in detail, in the vehicle antitheft apparatus of the present invention, before attempting to drive the vehicle again.
While the vehicle is parked, the power supply to the anti-theft unit can be cut off and the battery of the vehicle can be prevented from running down. As a result, it is possible to extend the life of the battery and reduce the burden of maintenance on the vehicle by the user.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an anti-theft device according to the present invention.

FIG. 2 is a sectional view showing an example of the ignition switch.

FIG. 3 is a flowchart showing an example of an operating procedure of the driver.

FIG. 4 is a flowchart showing the operation of the CPU.

FIG. 5 is a flowchart showing the operation of the CPU.

[Explanation of symbols]

1 ·· Anti-theft device 2 ... Battery 3 ... Ignition switch 4 ... Ignition device 5: Anti-theft unit 6 ... Switch mechanism 7 ... Destruction sensor 8 ・ ・ Removal sensor 12 ... Diode 23 ... Lock mechanism 31 ... CPU 32 ... EEPROM 33 ... Sealing circuit 34 ... Keyboard 38, 39 ... Relay 41 ... Fuse 46 ... Switch 50 ... CDI unit 56 ... Capacitor S3, S4 ...

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-121953 (JP, A) JP-A-2-41958 (JP, A) Actually open 63-43860 (JP, U) Actually open 62- 90867 (JP, U) Patent 3377568 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60R 25/00-25/10

Claims (3)

(57) [Claims] 1. A switch mechanism for opening and closing a power supply path from a power source to an ignition device by operating a key, a lock mechanism for limiting steering of a vehicle, and a sensor for detecting an abnormality of at least one of the switch mechanism and the lock mechanism. An ignition switch having and an electrically rewritable semiconductor memory are provided, and the function of at least one component of the ignition device is sealed based on the data stored in the memory and the abnormal signal from the sensor. , comprising a theft prevention unit for an ignition device in the unactuated state, the parts, with incorporated in at least one of the ignition switch and the anti-theft unit, the anti-theft unit is less
The ignition switch is turned off and the vehicle is parked.
After writing predetermined data to the memory in the car
A vehicle anti-theft device characterized in that the supply of power to the unit can be interrupted before the vehicle is driven again . 2. A switch mechanism for opening and closing a power source path from a power source to an ignition device by operating a key, a lock mechanism for limiting steering of a vehicle, and a sensor for detecting an abnormality of at least one of the switch mechanism and the lock mechanism. An ignition switch having and an electrically rewritable semiconductor memory are provided, and the function of at least one component of the ignition device is sealed based on the data stored in the memory and the abnormal signal from the sensor. A burglarproof unit that deactivates the ignition device, and an opening / closing unit that opens and closes a power supply path from the power source to the burglarproof unit, and the memory stores predetermined data when the opening / closing unit is in a closed state. Is written
A vehicle anti-theft device, characterized in that the power supply is shut off in the open state . 3. A control circuit to which a predetermined input signal from an input device and an abnormal signal from an ignition switch are input, and a sealing circuit for controlling the function of at least one component of the ignition device by the control signal of the control circuit. And storing data according to the input signal by the control signal of the control circuit, and when the power supply to the control circuit is cut off,
An electrically rewritable semiconductor memory capable of storing and maintaining the data, wherein the control circuit seals the data based on the data stored in the memory and the abnormality signal when power is supplied. A vehicle anti-theft device, wherein a function of the component incorporated in at least one of the ignition switch and the sealing circuit is sealed by a stop circuit.