JPH058216Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a vehicle anti-theft device comprising an anti-theft switch installed in series with an ignition switch (starter switch).

[Conventional technology]

Traditionally, vehicle anti-theft devices have been designed to issue an alarm if the door is opened with the ignition key (starter key) inserted to prevent the user from forgetting to remove the ignition key. There are known devices that prevent the engine from starting. An example of the latter is described in JP-A-55-63938. In this system, a keyboard-operated memory circuit is connected to the lead wire that connects the starter motor drive unit and the ignition key, so that the engine will not start unless a password is entered from the keyboard. .

[Problem that the idea aims to solve]

By the way, the above-mentioned system that issues the alarm merely prevents the user from forgetting to remove the ignition key, and therefore lacks certainty in its effectiveness in preventing theft. In addition, the device described in the publication requires a separate anti-theft device consisting of a numeric keypad keyboard and a memory circuit, leading to high costs and requiring additional installation space. Therefore, an object of this invention is to provide a vehicle theft prevention device that can reduce costs, require a small installation space, and reliably prevent vehicle theft.

[Means to solve the problem]

In order to achieve the above object, this invention provides a vehicle equipped with a shift instruction switch, a control circuit that logically judges a signal from the shift instruction switch, and an actuator that performs a gear shift operation in accordance with the output of this control circuit. , an anti-theft switch is provided in series with the ignition switch, and this anti-theft switch activates the control circuit when a signal inputted using the shift instruction switch as an entry key matches a signal stored in advance in the control circuit. The method is configured to turn on at the output of .

[Effect]

In a vehicle anti-theft device that employs such a method, the anti-theft switch is turned on and the ignition is turned on only when the signal input from the shift instruction switch as an entry key matches the signal stored in advance in the control circuit. The engine can now be started using the switch. If the signal entered using the shift instruction switch as an entry key does not match the signal stored in the control circuit in advance, the anti-theft switch is turned off and the engine cannot be started using the ignition switch. Theft is definitely prevented. Here, since the shift instruction switch and the control circuit, which are the components of the anti-theft device, are commonly attached to the vehicle, the cost is low and the installation space can be kept small.

【Example】

This invention will be explained below based on embodiments shown in the drawings. FIG. 1 is a system schematic diagram of one embodiment, and the transmission 1 of the vehicle is equipped with an actuator for changing gears, and the instrument panel 3 is equipped with an actuator as shown enlarged in FIG. 2. A shift instruction switch 4 is arranged. A control circuit 5 is interposed between the speed change instruction switch 4 and the actuator 2.
When the shift instruction switch 4, for example, the drive button 41 (see FIG. 2), is operated, the signal is input to the control circuit 5 and logically determined.
The transmission 1 is operated to shift into a drive range by actuating the actuator 2 based on the output. Similarly, transmission 1 has parking button 4 of shift instruction switch 4.
2, Reverse button 43, Neutral button 4
By operating each of the 4th and 4th buttons, the gears are changed accordingly. Here, the ignition switch 6 is connected to the control circuit 5 via an anti-theft switch 7 consisting of a relay switch, and when both the switches 6 and 7 are turned on, the engine is started. There is. The anti-theft switch 7 opens the contact 71 by operating the set button 46 attached to the panel 45 of the shift instruction switch 4, and the contact 71 is opened by energizing the coil 72.
1 is now closed. and control circuit 5
Now, each button of the shift instruction switch 4 is used as an entry key, and the entry signal inputted by its operation is memorized, and when the same entry signal is inputted by the operation of each of the above-mentioned buttons, the coil 72 is energized. This flowchart is shown in Figure 3. Next, the operation of the vehicle anti-theft device having such a structure will be explained. Now, the entry signal stored in the control circuit 5 is applied to the neutral button 4 of the shift instruction switch 4.
4. It is assumed that N, R, and D are set by the reverse button 43 and drive button 41. To start the engine in this case, turn on the ignition switch 6 by operating the ignition key as usual. Then, the open/closed state of the contact 71 of the anti-theft switch 7 is determined according to the flowchart shown in FIG. If the contact 71 is closed, the engine will start immediately, but normally the contact 71 is opened by the set button 46 to prevent theft, and the engine will not start. Therefore, shift instruction switch 4
Entry signals N, R, and D are input by operating the buttons. If this input is incorrect and does not match the stored entry signal, the system returns to waiting for another input and the engine is not started. When the entry signal is correctly input, the coil 72 is energized and the contact 71 is closed, so the anti-theft switch 7 is turned on and the engine is started.

[Effect of the idea]

As is clear from the above explanation, according to this invention, the anti-theft switch is turned on and the ignition is activated only when the signal inputted using the shift instruction switch as the entry key matches the signal stored in advance in the control circuit. The engine can now be started using the engine switch. If the signal entered using the shift instruction switch as an entry key does not match the signal stored in the control circuit in advance, the anti-theft switch is turned off and the engine cannot be started using the ignition switch. Vehicle theft can be reliably prevented. Here, since the shift instruction switch and the control circuit, which are the components of the anti-theft device, are commonly attached to the vehicle, the cost can be reduced and the installation space can be reduced.

[Brief explanation of drawings]

Fig. 1 is a system schematic diagram showing an embodiment of this invention, Fig. 2 is an enlarged perspective view of a gear shift instruction switch,
FIG. 3 is a flow chart of the system. 1... Transmission, 2... Actuator, 3... Instrument panel, 4... Gear shift instruction switch, 5... Control circuit, 6... Ignition switch, 7... Anti-theft switch.

Claims (1)

[Scope of Claim for Utility Model Registration] In a vehicle equipped with a shift instruction switch, a control circuit that logically judges a signal from the shift instruction switch, and an actuator that performs a gear shift operation in accordance with the output of this control circuit, An anti-theft switch is provided in series with the switch, and this anti-theft switch is turned on by the output of the control circuit when the signal inputted using the shift instruction switch as an entry key matches the signal stored in the control circuit in advance. An anti-theft device for a vehicle, characterized in that it is configured to do so.