JP2006035977A - Anti-theft device of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-theft device which avoids the necessity for an operator to memorize a password, enables the operator to start an engine (E) and drive a vehicle as long as the operator possess a starter key (3) even when the vehicle such as agricultural machinery is in storage for a long period, and which can prevent the theft of the working vehicle since the password stored on the starter key (3) side is created every time the engine is driven, thus just mechanically creating the same type of a starter key cannot start the engine (E). <P>SOLUTION: The starter key 3 of a tractor is provided with a memory device 4 on the key side and a transmitter 5. On the tractor side, a controller C is provided which creates a renewed password every time the engine makes a stop. Then, the controller makes a memory device 7 on the tractor side store the password, and makes the memory device 4 on the key side store the password through the medium of the transmitter 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to the structure of an antitheft device for work vehicles such as agriculture, construction, and transportation work, and in particular, checks a password when starting an engine, and allows the vehicle to be operated when they match.

Conventionally, various technical means have been invented and put into practical use for work vehicles in order to prevent theft. For example, Japanese Utility Model Laid-Open No. 6-85156 discloses an anti-theft device that allows a preset encryption (password) to be input when the engine is started, and that the engine be started when they match.
Utility Kaihei 6-85156

  The conventional technique is configured to connect an input key, which is a password input switch group, to a controller and to set a password to the controller using this input key. In the controller, the set personal identification number and the personal identification number input at the time of starting the engine are collated, and when they match, a rotation command is issued to the throttle motor so that the engine can be started. .

  However, according to the conventional technique, the operator always needs to store the password in order to start the engine. In particular, in the case of agricultural machinery such as tractors, they will be stored for a long time after the work season is over, so the next time you use the vehicle, you can forget the password and start the engine, and work quickly The problem that it cannot move to is assumed. Further, the conventional configuration has a problem that if the password is known to others, the same type of engine start key, that is, a combined key, is created, so that the vehicle can be operated.

In view of the above-described problems, the present invention is configured as follows with a work vehicle antitheft device.
That is, the invention described in claim 1 is a work vehicle anti-theft device that requires a password verification when the engine (E) is started. The key-side storage device (4) is included in the engine start key (3) of the vehicle. And a communication means (5), on the other hand, a password is created for each drive of the engine (E) on the vehicle side, and this password is passed through the vehicle-side storage device (7) and the communication means (5). The work vehicle antitheft device is characterized by comprising control means (C) for storing the key side storage device (4).
(Operation of claim 1)
In the work vehicle according to claim 1 configured as described above, a password is created at each timing when the engine (E) is driven, for example, when the engine is started or stopped, and the password is stored in the vehicle-side storage device (7). The data is stored in the key storage device (4) via the communication means (5). Then, both passwords are checked when the engine is started, and if they match, the engine (E) can be started.

In the invention described in claim 2, after the control means (C) transmits the created password to the engine start key (3) side, the password is stored on the key side of the engine start key (3) side. The theft prevention of the work vehicle according to claim 1, further comprising standby means for holding the newly created password in an invalid state until it is stored in the device (4) and the password is received again. The device.
(Operation of claim 2)
In the work vehicle according to claim 2 configured as described above, a password created every time the engine is driven is transmitted to the engine start key (3) side, and the password is stored in the key side storage device from the engine start key (3) side. This password is kept invalid until it is stored in (4) and the password is received again.

  Thus, according to the first aspect of the present invention, the operator does not need to memorize the password, and even if the vehicle is stored for a long time, for example, an agricultural machine, even the engine start key (3) is possessed. If so, the engine (E) can be started and the vehicle can be driven. Moreover, since the password stored on the engine start key (3) side is created every time the engine is driven, the engine (E) can be started only by mechanically creating the same engine start key. It is not possible to prevent the work vehicle from being stolen.

  According to the invention of claim 2, even if the power supply becomes unstable when the vehicle engine is stopped or the transmission of the password is interrupted or changed due to poor communication, the password is valid. When the engine (E) is started next time, a password mismatch occurs and the engine (E) cannot be started.

Hereinafter, an embodiment in which the present invention is mounted on an agricultural tractor will be described with reference to the drawings.
First, the configuration of the tractor 1 will be described.
As shown in FIG. 4, the tractor 1 has an engine E mounted in a hood at the front of the vehicle body, and the rotational power of the engine E is transmitted to the left and right front and rear wheels 10 </ b> F via the transmissions in the mission case 9. 10R is transmitted to 10R. A cabin 11 is mounted on the transmission case 9, and various operation mechanisms such as a cockpit 13, a steering handle 14, a liquid crystal monitor M, a dashboard 15 having an engine start switch 2, and the like are arranged in the cabin. It is said. Further, at the rear part of the transmission case 9, various working machines, a rotary working machine in the illustrated example, are connected via a so-called three-point link mechanism 12 comprising a left and right lift arm 8, and a top link 12a and left and right lower links 12b and 12b connected thereto. It is the structure which connects R so that raising / lowering is possible.

  As shown in FIG. 5, the dashboard 15 includes a liquid crystal monitor M that displays a plowing value in cm, and a plowing depth reset switch 16 that sets the plowing value to 0 cm at an arbitrary timing. A potentiometer-type angle sensor 20 is provided at the rotation base of the top link 12a, and a change in the detected value is calculated by the display controller C3, so that a preset tilling value is maintained during tilling control. The lift arm 8 is driven up and down, and the plowing depth display on the monitor M is appropriately changed.

The dashboard 15 is provided with a key hole 21 for the engine start switch 2, the key-type engine start key 3 is inserted, and the power system of the tractor 1 is turned on by first rotating to the first position. The engine starter circuit is configured to send power to the engine to start the engine E. Next, an engine starter for the tractor 1 having an antitheft device will be described with reference to FIGS.

  As shown in FIG. 1, the control means C of the tractor 1 is composed of three controllers, ie, an engine control controller C1, a work implement control controller C2, and a display controller C3. Each is connected via a communication line and shares various control data and sensor information.

  More specifically, the engine starting device of the tractor 1 is composed of an engine control controller C1 on the tractor 1 side and an engine start key 3. The engine control controller C1 on the tractor side is connected to this input section. An engine rotation sensor 30 and a throttle position sensor 31 are connected to each other. A start switch 2a and a stop switch 2b in the engine starter circuit are connected to the output section, and an engine tachometer and various pilot lamps on the dashboard 15 are connected. It is configured to connect.

  The engine control controller C1 stores a CPU that processes various signals, a wireless communication device 6 (vehicle side communication means) that enables communication with the engine start key 3, and various data and control programs. EEPROM 7 (vehicle side storage device) to be configured, a timer, and the like.

  On the other hand, the engine start key 3 includes a wireless communication device 5 (key side communication means) that enables communication between the CPU that processes various signals and the engine control controller C1 on the tractor 1 side. An EEPROM 4 (key-side storage device) for storing data and a battery 19 are provided.

In the tractor 1 configured as described above, a password related to the anti-theft device is set as shown in FIG. 2, and password verification is performed as shown in FIG.
First, a password setting process for the engine control controller C1 will be described with reference to FIG.

  The engine control controller C1 of the tractor 1 reads the states of various sensors and switches while the engine is being driven, and determines whether or not the engine E has been stopped by the engine start key 3. If this determination is YES, the controller C1 creates a new password with a random coefficient, and sets the current password (old password) as a saving means on the memory of the EEPROM 7 as a saving means.

  The new password is stored as a temporary issue state in its own EEPROM 7 and transmitted to the engine start key 3 via the communication device 6. As a result, the new password is held in a standby state.

  On the other hand, the engine start key 3 receives the password through the communication device 5 and stores it in the EEPROM 4 on the key side. Further, after confirming the storage, the password is transmitted again to the engine control controller C1 on the tractor 1 side via the communication device 5.

  Further, the engine control controller C1 of the tractor 1 checks whether or not the password returned from the key side matches the password of the EEPROM 7, and if it matches, sets the password to the valid state.

  Note that if the password transmission request is not received even after a predetermined number of times or if the received password does not match, the old password in the saved state is restored and the confirmation result is notified by the buzzer or the monitor M. Yes.

  As a result, the operator does not need to memorize the password. For example, if the vehicle is not used and stored for a long time such as an agricultural machine, the operator can hold the engine start key 3 as long as The engine E can be started quickly and the vehicle can be driven. Moreover, since the password stored on the engine start key 3 side is created every time the engine is stopped, the engine E cannot be started simply by mechanically creating the same type of key. Vehicle theft can be prevented in advance.

  Also, if the communication state of the communication devices 5 and 6 is poor or the power supply becomes unstable when the engine of the tractor 1 is stopped, it is assumed that the password transmission is interrupted or changed in the middle. Since the password is confirmed to be stored on the key 3 side, the wrong password is not validated, and when the engine E is started next time, the password mismatch occurs, and the engine E is turned off. It is possible to eliminate problems such as inability to start.

  As another form of the invention, the timing for creating the new password may be when the engine is started or after a predetermined time has elapsed after starting. As a result, the password is set while the power to the engine control controller C1 and the communication device 6 is stable compared to when the engine is stopped, so that the password is not lost or changed.

  As another form of the key, as shown in FIG. 6, it may be configured as a card-type key 3 ', and equipped with a communication device 5, a flash memory 4 and a CPU 18 as a key-side storage device. In this case, the controller C on the tractor 1 side includes a card reader as the communication device 6 that reads the information of the card type key 3 ′, and starts the engine 2 based on password verification as described above.

The password verification process will be described with reference to FIG.
Specifically, the door 23 of the cabin 11 includes a key insertion detection switch 25 </ b> A for detecting the insertion operation of the engine start key 3 into the key hole 26, and the handle 34 at the door opening / closing handle 24 portion. The door lock release switch 35B that detects the release of the lock device is provided. The engine control controller C1 uses the timer to measure the time from when the engine start key 3 is inserted into the key hole 26 by both switches 25A and 25B until the lock is released, and for a predetermined time (5 seconds). If the door 23 is not unlocked even after the elapse of time, the engine E is not started even when the verification of the password matches.

  As a result, even if the passwords match, when it takes time to open and close the door 23, the door 23 can be opened with time, for example, with a tool, a wire, or an errored key. Even if there is nothing, since the engine E is not started, for example, it is possible to reliably prevent the vehicle from being stolen as compared with a configuration in which the engine E is started only by password verification.

Next, based on FIG. 5, FIG. 7, and FIG. 8, the configuration of the turning control device will be described as an example of the control performed by the work machine controller C2.
When the tractor 1 reaches the end of the field, the turning control device operates the turning lever 35 provided on the base of the handle 14 upward or downward as shown in FIG. This is an automatic turning control device in which the direction designation switch 32L (32R) is turned ON, the working machine controller C2 raises the working machine R to the non-working position, and the front wheels 10F are automatically steered to turn.

  Specifically, as shown in FIG. 7, the work machine controller C2 includes a turn control on / off switch 31 for turning on and off the operation of the turn control device on the input side, and a turn lever 35 base for specifying the turn operation direction of the vehicle body. Turning direction designation switches (left switch 32L, right switch 32R), a work implement height setting dial 33 for arbitrarily setting the rising height of the work implement R, and a handle turning angle sensor 14s for detecting a turning end operation of the vehicle. The seat switch 13s and the vehicle speed sensor 34 for detecting the rotational speed of the front wheels are connected as means for detecting the seating of the operator. Further, on the output side of the work machine controller C2, solenoids 36a and 36b of control valves for supplying and discharging pressure oil to the power steering hydraulic cylinder and the lift arm 8 are driven up and down to raise and lower the work machine R. Control valve solenoids 37a and 37b are connected to each other.

  In the work machine controller C2, when one of the turning direction designation switches 32L and 32R is turned ON with the turning control ON / OFF switch 31 turned ON, the solenoids 36a and 36b of the control valve are energized. The left and right front wheels 10F, 10F are steered to the turn designation side, and the work implement R is raised to the position set by the work implement height setting dial 33 (point A in FIG. 8).

  At the end of turning, the steering angle sensor 13s detects that the steering angle has returned to the neutral range (point B in FIG. 8), and the vehicle speed sensor 34 detects the running state of the vehicle. Further, when the seat switch 13s is ON, that is, when the operator is seated on the cockpit 13, the work machine R is lowered to the original position.

  As a result, when the turning lever 35 is operated up or down when the tractor 1 reaches the end of the field, the vehicle is automatically automatically turned into a turning state, and the work equipment R is automatically raised, and further turning is completed. Sometimes the work equipment R is automatically lowered, so that the burden on the operator is greatly reduced. Further, when the work machine R is lowered, the operator is on the tractor 1 and is lowered when the tractor 1 is moving. For example, the turning is interrupted and the operator gets off and confirms the state of the field. Or when the lower part of the work machine R is maintained, the work machine is not lowered by mistake.

  As another form of this turning control, the rotational speed of the front wheel 10F may be increased during turning, or the rear wheel 10R inside the turning may be braked to assist the turning.

The block diagram which shows the connection state of the controller for engine control. 7 is a control flowchart showing password setting processing. 7 is a control flowchart showing password verification processing. A side view of a tractor. The figure which shows the connection state of the controller for a display. The block diagram which shows another form (card type key). The figure which shows the connection state of the controller for working machines. The figure which shows the effect | action of turning control.

Explanation of symbols

C control means C1 controller for engine control E engine 1 tractor 2a engine start switch 2b engine stop switch 3 engine start key 4 EEPROM (key side storage device)
5 communication equipment (communication means)
7 Communication equipment (communication means)

Claims (2)

In a work vehicle antitheft device that requires password verification at the time of starting the engine (E), the engine start key (3) of the vehicle is provided with a key-side storage device (4) and a communication means (5), On the vehicle side, a password is created each time the engine (E) is driven, and this password is stored in the vehicle-side storage device (7) and the key-side storage device (4) via the communication means (5). An anti-theft device for a work vehicle, comprising a control means (C). The control means (C) transmits the generated password to the engine start key (3) side, then stores the password in the key side storage device (4) on the engine start key (3) side and stores the password. 2. The work vehicle antitheft device according to claim 1, further comprising standby means for holding the newly created password in an invalid state until it is received again.

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