JPH0332962A - Burglar prevention device for vehicle - Google Patents

Abstract

PURPOSE:To prevent an engine stop due to malfunction during a vehicle travel in a device for stopping the operation of an engine ignition system upon appearance of a burglar detection mode by applying the constitution wherein the function of the ignition system is not interrupted when an engine operation mode is detected. CONSTITUTION:When a burglar detection mode such as door opening or vibration application to a body appears, CPU 10 outputs a signal to an output terminal 7 via a transistor 12 and shortcircuits an ignitor circuit 22, thereby interrupting power supply to the primary coil 21 of an ignition coil 20 and stopping an engine. In the aforesaid burglar prevention device, a G-sensor is for detecting the output voltage of a generator driven on the operation of the engine, and an ultrasonic sensor 15 for detecting a vehicle travel mode are respectively provided. In addition, control is so made that the function of an ignition system is not interrupted, when an engine operation mode (vehicle travel mode) is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle anti-theft device that can be applied not only to automobiles and motorcycles but also to boats and the like.

(Prior Art) Vehicles such as automobiles are equipped with anti-theft devices. There are various types of anti-theft devices, but most of them are designed to stop the function of the engine's ignition system when the vehicle enters a predetermined theft detection state. Predetermined theft detection conditions include opening a door, applying vibration to the vehicle body, turning on the ignition switch, and making unnatural movements within the vehicle interior. If this situation occurs and you determine that this is a theft notification, you can notify the driver at a distance by sounding the horn, flashing the headlights, or turning off the ignition. Sometimes the power to the coil is cut off.

(Problem to be Solved by the Invention) If the above notification method is used, no problem will occur if the vehicle is stopped, but if the notification method is activated while the vehicle is running,
Furthermore, if the ignition coil is de-energized, if the anti-theft device is activated by mistake, the vehicle will come to a sudden stop, which will be undesirable for the occupants and the following vehicle. Furthermore, when the engine is a car with a carburetor and is equipped with a catalytic converter, there is a problem in that raw gas is sent to the catalytic converter, causing the catalytic converter to melt.

The present invention has been made in view of these points, and prevents the above-mentioned situation from occurring by preventing theft notification from occurring while the vehicle is running, even if the theft detection state occurs. The purpose of the present invention is to provide a vehicle anti-theft device.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a vehicle theft prevention system that stops the function of the engine's ignition system when a predetermined theft detection state is reached. The apparatus is provided with a circuit for detecting the operating state of the engine, and is configured such that the function of the ignition system does not stop when the circuit detects the operating state of the engine.

(Function) With this configuration, even if the theft is detected, as long as the engine is running, the power to the ignition coil will not be cut off, which will protect the passengers and the following vehicle. It has no impact.

(Example) Hereinafter, one example of the present invention will be explained with reference to the figures.
In the figure, reference numeral 1 denotes an electric control unit (hereinafter referred to as ECLJ), which processes signals input manually to input terminals 2.3.degree. 4.5 and issues control output signals to output terminals 6.7. 8 is a positive side power supply terminal, and 9 is a negative side power supply terminal. This ECtJl has a built-in CPU 10, and is configured to apply an output signal to an output terminal 6.7 via a transistor 11.12. is on the positive side
Terminal 8 has an ignition switch (main switch)
13 and a fuse 14 to connect the positive side of a battery 15 serving as a power source. The negative side of the battery 15 is connected to a ground circuit.

An alarm start switch 16 is connected between the input terminal 2 and the ground circuit, and a door switch 17 is connected between the input terminal 3 and the ground circuit. The contacts of this door switch +7 close when the door is closed. A G sensor 18 is connected between the input terminal 4 and the ground circuit to detect the output voltage of a generator driven by the operation of an engine (not shown). Furthermore, an ultrasonic sensor 19 is connected to the input terminal 19 . This ultrasonic sensor 19 emits ultrasonic waves when activated, and
The driving state of the vehicle is detected by receiving the reflected wave when this ultrasonic wave hits another object and returns.

One end of the primary coil 21 of the ignition coil 20 is connected to the output side of the ignition switch 13, and an igniter circuit 22 is connected between the other end of the primary coil 21 and the ground circuit. A distributor (not shown) is connected to the secondary coil 23 of the ignition coil 20. A horn 24 as an alarm is connected between the output terminal 6 and the input side of the ignition switch 13.
is connected, and the output terminal 7 is connected to the connection point between the primary coil 21 of the ignition coil 2o and the igniter circuit 22. Although not shown, the ECUI also has a built-in timer circuit. When I did,
The output signal is not output for that set time.

With this configuration, when this 'AW is applied to a vehicle anti-theft device that stops the function of the engine's ignition system when a predetermined theft detection state is reached, the engine operation When this is detected, the ignition system will operate to prevent it from stopping.

Next, the operation of this vehicle anti-theft device having such a circuit configuration will be explained. In this device, in a normal state before entering a so-called theft detection state, when the CPU 10 issues an output signal to the output terminal 7 via the transistor 12 and short-circuits the igniter circuit 22, the primary coil of the ignition coil 20 Since intermittent current no longer flows through 21, the ignition function is stopped and the engine is stopped. At the same time, if an output signal is issued to the output terminal 6 via the transistor 11, the horn 24 will sound to notify the state. However, as mentioned above, it is not desirable for something like this to occur while the vehicle is running, so it is best to disable this function in such a case.
This is the object of the present invention.

The operation of this apparatus configured as described above to achieve this purpose will be explained with reference to the flowchart of FIG. With the vehicle door closed and the door switch 17 closed, the ignition signal is checked in step 30. This confirmation is easily performed based on the output status of the G sensor 18.

When it is confirmed that there is an ignition signal, the initial state is returned (step 31), and it is disabled when the engine is running. When the engine is not running, the state of the alarm start switch 16 is confirmed (step 32), and if it is confirmed in this step that it is closed (step 33), a timer circuit is set (step 34). ), if the time is over (step 35), it is determined whether the alarm start switch 16 is closed (step 36), and if it is closed, CPIJIO turns on transistors I+ and 12 to stop the engine. and issue an alarm (step 37).
. In addition, in the above operation, the ignition signal confirmation in step 30 may be replaced by a vehicle speed sensor.

(Effects of the Invention) Since the present invention is configured as described above, the engine will not stop when the vehicle malfunctions while the vehicle is running, so there will be no inconvenience to passengers or following vehicles. In addition, in vehicles equipped with a catalytic converter as an exhaust purification device, the catalytic converter can be protected.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a flowchart explaining the operation of the device shown in FIG. 1 - Electrical control unit (ECU) 13 - Ignition switch 15 - Battery + 6 - Alarm start switch 17 - Door switch 18 - G sensor same ultrasonic sensor 20 - Ignition coil 22 - Igniter circuit 24 - Horn patent

Claims (1)

[Claims] (1) In a vehicle anti-theft device that stops the function of the engine's ignition system when a predetermined theft detection state is reached, a circuit for detecting the operating state of the engine is provided, and the circuit detects the engine's operating state. A vehicle anti-theft device, characterized in that the ignition system is configured so that the function of the ignition system does not stop when the ignition system is detected.