JP3430538B2 - 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 a vehicle antitheft device.

[0002]

2. Description of the Related Art An anti-theft device for a vehicle is designed to activate a horn or a warning lamp when a door, a hood, a trunk lid, etc. are opened without a predetermined operation after entering a warning mode by locking. An alarm is issued by turning on. Further, in order to prevent the vehicle itself from being stolen, the engine is put into a non-startable state. Such an anti-theft device is disclosed in, for example, Japanese Patent Laid-Open No. 63-
It is disclosed in Japanese Patent No. 269759. In the disclosed device, the alert posture can be partially released by a specific operation to enhance its functionality.

Recently, it is considered to use multiplex communication for an anti-theft device (for example, Japanese Patent Application No. 4-190852).
issue). In order to eliminate the enlargement and complexity of the wire harness that connects electrical components such as switches and lamps, signals are transmitted and received by a plurality of nodes in a time division manner via a single multiplex communication line.

[0004]

When the multiple communication system is adopted for the anti-theft device, for example, one main node and a plurality of sub nodes are connected by multiple communication lines so that only the main node has the function of judging the theft. Can be considered. In addition, if a failure occurs in any of the sub-nodes, the main node should not be put on alert to prevent misjudgment, and the entire anti-theft device becomes inoperable due to the failure of one node. I will end up. For example, if a node equipped with a switch for detecting the opening of the bonnet is accidentally broken or intentionally disconnected, the anti-theft function cannot be achieved despite the fact that other nodes can detect the opening of the door. . The same applies when a runaway occurs in the control mechanism of any of the subnodes.

An object of the present invention is to ensure the continuity of the antitheft function and enhance the certainty of the theft determination in a vehicle antitheft device.

[0006]

In order to solve the problem] was to achieve the above purpose
Therefore, the invention of claim 1 is a multiplex communication in which a plurality of nodes are common.
Between the nodes connected to the line via the multiplex communication line
Use a device to prevent theft of vehicles that send and receive signals at
And each of the plurality of nodes has a function of judging theft,
And at each one it was to make a theft determination according majority logic between the nodes.

In the invention of claim 2, a plurality of nodes are common.
Each of which is connected to the multiplex communication line
To prevent theft of vehicles that send and receive signals between nodes
In the device , each of the plurality of nodes has a function of judging theft.
And a first theft notification means for notifying each of the thefts, the first theft notification means being connected to one node having the theft determination function, and the second theft notification means. are those assumed to be connected to other nodes having the functions of the theft determination.

[0008]

According to the invention of claim 1, the plurality of nodes are respectively
Since the theft judgment is executed, there is a problem with either node.
Even if it occurs, the anti-theft function can be achieved by other nodes.
Wear. Moreover, since each node decides the theft according to the majority decision logic, the certainty of the decision can be enhanced. Even if a runaway occurs in the control mechanism of any node, erroneous determination can be prevented.

According to the invention of claim 2, the plurality of nodes are
Since each of them makes a judgment of theft, it is disabled in any node.
Even if a conflict occurs, the anti-theft function can be reached by another node.
Can be done. Moreover, since the theft notification is performed in each of the plurality of nodes, the theft notification can be performed by the other nodes even when a failure occurs in any of the nodes.

[0010]

1 is a block diagram showing the structure of an anti-theft device according to an embodiment of the present invention. In this embodiment, four nodes (the latter two are not shown), which are a meter node 10, a front node 20, a door node, and a rear node, which are connected to each other by a communication line 2 for multiplex communication (the latter two are not shown), are used to prevent theft. It constitutes the burglarproof system.

The meter node 10 arranged in the instrument panel includes a chip (multiple IC) 11 for controlling transmission / reception of signals through the communication line 2 and a central processing unit (CPU) for controlling the theft judgment. 12 and 12. The CPU 12 of this meter node is connected to a horn 14, an ignition switch 15, a keyless entry switch 16 and a starter cut relay 17 via an input / output port (I / O) 13. The front node 20 arranged in the bonnet is also the meter node 1
Like 0, it has a multiplex IC 21 and a CPU 22.
The CPU 22 of the front node is connected to a bonnet switch 24 for detecting opening / closing of the bonnet and a warning lamp 25 via the I / O 23. The door node (not shown) has a switch group for detecting the opening / closing of the door and the presence / absence of locking of the door, and the rear node has a configuration of a switch group for detecting the opening / closing of the trunk lid and the presence / absence of locking of the trunk lid, each connected to the CPU. I have it. Moreover, each of the CPUs of these four nodes has a theft judgment function.

The keyless entry switch 16 is turned on (locked) after the ignition switch 15 is turned off.
Then, these operations are transmitted from the meter node 10 to the other three nodes through the communication line 2 and the bargra system is activated. That is, all four nodes are on alert. The keyless entry switch 1 by the passenger
When the off operation of 6 is performed, the alert postures of all the nodes are released.

FIG. 2 is a flow chart showing the procedure of the theft judgment in each node. If the door, hood, or the like is opened during the alert without relying on the keyless entry, a theft signal is issued (steps S11, S12, S1).
3). For example, when the hood is opened, the theft signal is transmitted from the front node 20 to the other three nodes through the communication line 2. At the same time, the bonnet switch 2
The transition from the on state to the off state of No. 4 is transmitted from the front node 20 to the other three nodes. As a result, the theft judgment is executed in parallel on the nodes other than the front node 20, and the theft signal is output from each node. That is,
If the door, hood, etc. are opened during the alert, each node will receive the communication line 2 in addition to the theft signal based on its own judgment.
Receive three theft signals through. However,
If the person is not yet alert, a non-theft signal is output (steps S11 and S14).

For example, in the front node 20, multiple I
When a disconnection occurs between C21 and the communication line 2, it becomes impossible to transmit the theft signal or the bonnet open signal from the front node 20 to the other three nodes. According to the present embodiment, even in such a case, the remaining three nodes can each enter the alert state, and the theft signal is output when the door is opened, for example.

FIG. 3 is a flow chart showing the procedure for issuing an alarm in each node. When the theft signal is input (step S21), the number of the theft signals and the number of the non-theft signals are compared (step S22). And
The alarm operation is executed according to the majority logic (step S23). Specifically, the meter node 10 causes the horn 14 as the first theft notification means to ring, and
The starter cut relay 17 is operated so that the engine cannot be started, and its contact is opened. The front node 20 also turns on a warning lamp 25 as a second antitheft means.

For example, if the CPU of the door node runs out of control, only the door node may output the non-theft signal even though the other three nodes output the theft signal. Even if there is such discrepancy in the theft determination, the meter node 10 or the front node 20 can make an appropriate theft determination according to the majority logic.

As described above, according to the present embodiment, even if any node has a defect such as disconnection or runaway, the other node can execute the theft judgment, and the proper theft judgment can be made. In addition, if a warning display is provided, for example, in the meter node 10 when a disconnection occurs in any of the nodes or a discrepancy occurs in the theft determination of each node, it is easy for the occupant to take measures.

According to the configuration of FIG. 1, when the bonnet is opened during warning, an alarm output including the sounding of the horn 14 and the lighting of the warning lamp 25 is issued, and the starter cut relay 17 operates. Engine start is prohibited. However, if the wiring of the battery, which is the power supply source of all the electrical components, is forcibly removed after opening the bonnet, the alarm output is stopped and the engine start prohibition is released. Moreover, since the CPU of each node constituting the Burglar system is configured to be power-on reset (system reset), if the battery is reconnected, each node is initialized, and as a result, the alarm output is stopped. And the engine can be started.

FIG. 4 shows a modification of the antitheft device for dealing with such battery removal. In this modification, the starter cut relay 1 is provided in the meter node 10.
It was decided to add a bargra working memory relay 18 to 7. Specifically, the bargra working memory relay 18
The exciting coil of the battery 4 and the I / O 13 of the meter node are arranged in parallel with the exciting coil of the starter cut relay 17.
It is inserted between the output transistor (open collector) inside. The contacts of the bargra working memory relay 18 having the initial position a and the memory position b are the starter cut relay 1
It is arranged between the connection point c between the exciting coil of No. 7 and the output transistor in the I / O 13 and the ground.

According to the configuration of FIG. 4, when the output transistor in the I / O 13 is turned on due to the theft judgment of the meter node 10, a current is supplied from the battery 4 to the exciting coil of the starter cut relay 17, as a result, The contacts open and engine start is prohibited. At the same time, a current is supplied from the battery 4 to the exciting coil of the Berger working storage relay 18, so that the contact of the relay transits from the initial position a to the storage position b. If the battery is removed in this state, the contacts of the starter cut relay 17 are closed by stopping the current supply to the exciting coil. On the other hand, the contact of the bargra operation storage relay 18 holds the storage position b. At the time of reconnecting the battery 4, even if the output transistor in the I / O 13 for driving the starter cut relay 17 is turned off, a current flows through the excitation coil of the starter cut relay 17 through the contact of the bargra working memory relay 18. , The contact of the latter relay opens immediately and engine start is prohibited. If the horn 14 is connected in parallel with the exciting coil of the starter cut relay 17, the battery 4
It is also possible to ring the horn 14 when reconnecting.

According to this modification, the continuity of the antitheft function can be further enhanced. It is also effective as a battery removal measure that the CPU of each node is provided with a non-volatile memory for storing the theft determination, instead of the configuration of the Burglar operation storage relay 18. Until the specific operation is performed, the memory of the theft determination is held in each nonvolatile memory. A password input device such as a numeric keypad or an ID card reader is connected to a multiplex communication line for vehicle control including a bargrass system, and after the power supply is stopped by removing the battery, specific information can be input through the password input device. Unless otherwise specified, a configuration in which the operation of the entire vehicle control system is stopped is also effective.

[0022]

As described above, according to the invention of claim 1,
According to Ming, each node decided to make a theft decision.
Therefore, even if one of the nodes fails, the other
The node can achieve the anti-theft function. Moreover, since each node decides the theft according to the majority decision logic, the certainty of the theft decision can be enhanced.

According to the invention of claim 2, each node is stolen.
Since it was decided to execute the judgment, it was
Anti-theft function by other nodes even if conditions occur
Can be achieved. Moreover, even if a failure occurs in any of the nodes, the other nodes notify the theft, so that the antitheft function can be further enhanced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an anti-theft device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure for determining theft by the device shown in FIG.

FIG. 3 is a flowchart showing a procedure for issuing an alarm by the device of FIG.

FIG. 4 is a block diagram showing a modified example of the apparatus of FIG.

[Explanation of symbols] 2 communication lines 4 battery 10 meter node 11 Multiple IC 12 CPU 14 horn 15 Ignition switch 16 keyless entry switch 17 Starter Cut Relay 18 Burger working memory relay 20 front nodes 21 Multiple IC 22 CPU 24 Bonnet switch 25 warning lamp

Claims (2)

(57) [Claims] 1. A plurality of nodes are connected to a common multiplex communication line.
Connected and signal between each node through the multiplex communication line
Is a device for preventing the theft of a vehicle that transmits and receives, wherein each of the plurality of nodes has a function of judging theft, and
An anti-theft device characterized by making a theft judgment according to a majority decision logic between the nodes. 2. A plurality of nodes on a common multiplex communication line
Connected and signal between each node through the multiplex communication line
An apparatus for preventing the theft of a vehicle that transmits and receives information , wherein each of the plurality of nodes has a theft determination function and includes a first theft notification means and a second theft notification means for notifying each of the thefts. The first theft notification means is connected to one node having the theft determination function, and the second theft notification means is connected to another node having the theft determination function. Prevention device.