JPS5818267B2 - Vehicle anti-theft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-theft device for a vehicle, and in particular, if the steering wheel is forgotten to be locked, a flashing lamp will warn the driver, and if the vehicle is parked with the steering wheel locked, the ignition key will be activated. The present invention relates to a device that continues to issue a warning until the engine stops rotating when the engine is started.

As shown in FIG. 1, a conventional alarm device for preventing theft of a vehicle includes a steering switch 1 whose contact is turned OFF when a steering lock mechanism operates to lock the steering wheel and a lock pin pops out. It is comprised of a series circuit of a door switch 2 that turns on and off contacts as the door opens and closes, a power source 3, and an alarm 4.

That is, when the steering wheel is about to be locked, the steering switch 1 is turned on, and when the door is opened, the door switch 2 is turned on, power is supplied to the alarm 4, and the alarm 4 sounds, but when the door is closed again, the door switch 2 is turned on. The door switch 2 is turned OFF and the alarm is stopped.

Therefore, there was a possibility that a sufficient warning could not be given for forgetting to lock the steering wheel.

The present invention was developed in view of the above, and when the door is opened when the ignition key has been forgotten to be removed, a flashing lamp will flash to warn that the steering wheel has been locked. To provide a device in which when an attempt is made to start an engine without using an ignition key and the engine is started by changing the wiring of the engine starting circuit or ignition circuit, an alarm continues to sound until the rotation of the engine is stopped. With the goal.

The present invention will be explained based on the embodiment shown in FIG.

5 is a steering switch having two contacts provided in the steering lock mechanism; 5a is turned OFF when the lock pin pops out when the steering is locked;
A contact point of the steering switch 5 that turns ON when the steering lock pin is retracted when the steering wheel is locked.
5b is a contact point of the steering switch 5 which is ON when the steering wheel is locked, t when the lock pin protrudes, and OFF when the steering wheel is not locked, that is, when the lock pin is retracted; 6 is a contact point of 0N- when the door is opened/closed.
OFFL A door switch that turns on the contact when the door is open, I is a normally open relay constituting a known self-holding circuit, 7
a is the coil of the relay 7, 7b is the contact of the relay 7, 8 is a negative pressure switch that detects all the engine suction negative pressure and turns on the contact at the suction negative pressure when the engine rotation speed is higher than the idle link rotation speed, 9 is an oil pressure switch that senses the oil pressure of the oil pump driven in synchronization with the engine, and switches the contact OFF at a higher oil pressure than the oil pressure generated when the engine idle speed is reached; Then, there is a timer that turns on the circuit for a pre-installed time, preferably a long time, 11 is a diode to prevent current from flowing backward, and 12 is a power source.

Further, 13 is a flashing lamp, preferably a 4-way pulp parking light, and 14 is an alarm, preferably a horn.

Contact point 5a1 of steering switch 5 Door switch 6
, a flashing lamp circuit in which the coil 7a of the relay 7, the flashing lamp 13, the oil pressure switch 9, the timer 10, and the diode 11 are all connected in series, and the contact 5 of the steering switch 5.
b, an alarm circuit in which the negative pressure switch 8 and the alarm 14 are all connected in series are connected in parallel to the power supply 12.

Further, a contact point 7b of a relay γ is connected to the door switch 6 in parallel.

Next, the operation of the apparatus configured as described above will be explained.

When the engine is stopped, the negative pressure switch 8 is OFF.
, the oil pressure switch 9 is ON.

In this state, when the steering wheel is not locked, the contact 5a of the steering switch 5 is turned ON, and therefore, when the door is opened, the door switch 6 is turned ON, the flashing lamp circuit is closed, and the flashing lamp 13 flashes.

At the same time, contact 7b of relay 7 turns ON and door switch 6
As a result, the flashing lamp 13 continues to be lit regardless of whether the door is opened or closed due to the self-holding circuit formed by the relay 7.

When timer 10 becomes non-conductive after a preset time,
Alternatively, when the steering wheel is locked and the contact 5a of the steering switch 5 is turned off, the current flowing through the blinking lamp circuit is cut off and the blinking lamp 13 stops blinking.

When the same engine is stopped, the door is opened before getting into the vehicle, and the steering lock is released using the ignition key before closing the door. When the lock pin is retracted, the contact 5a is turned ON and the flashing circuit is closed. Flashing lamp 1
3 flashes.

This flashing stops when the engine is started, and the oil pressure switch 9 is turned off when the engine rotates at a speed higher than the idling speed.

This flashing alerts you to the opening of the door, which helps improve safety.

Similarly, if the engine is stopped and the steering lock is released with the ignition key after closing the door when getting into the vehicle, the door switch 6 is OFF, so the flashing lamp circuit will not close, and therefore the normal owner will not be able to turn on the engine. When starting up, the flashing lamp 13 does not flash.

The contact 5b of the steering switch 5 and the negative pressure switch 8 are usually not turned on at the same time.

Normally, the alarm 14 does not sound.

However, when the contact 5b is ON, that is, the steering is locked and the lock pin is protruding, if you change the wiring of the engine starting circuit or ignition circuit and start the engine, the negative pressure switch 8 will turn ON and the alarm circuit is closed.

Therefore, the alarm 14 sounds to warn that the vehicle is in an abnormal state.

This warning continues as long as the engine speed exceeds the idling speed, and even if the engine stops rotating once, the engine is started again, and when the speed reaches the idling speed or higher, the alarm circuit closes again and issues a warning.

Since the present invention has the above-described configuration, if the driver forgets to lock the steering wheel and gets out of the vehicle, the flashing parking light not only warns the occupants outside the vehicle that the driver has forgotten to lock the steering wheel, but also indicates that the vehicle is parked. It is easy to check whether or not a vehicle is moving outside the vehicle.

Also, if you open the door and get into the vehicle and release the steering lock before closing the door, the flashing lamp inside the vehicle will flash until the engine starts, warning you to open the door, and the driver will carelessly get out of the vehicle and leave the vehicle. warning that the steering wheel is not locked.

Furthermore, if you attempt to start the engine or move the vehicle without using the ignition key for any other purpose, an alarm will sound.

Therefore, the vehicle theft prevention effect is significantly improved.

In addition, in the present invention, the operating state of the engine is detected using separate systems, the oil pressure switch and the negative pressure switch, so even if either one of them fails, both of the above alarm functions are prevented from becoming inoperable. It's possible and it's very safe.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a conventional device, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 5...Steering switch, 5a, 5b...
...Contact point of steering switch 5, 6...
・Door switch, 7...Relay, 7a...
... Relay 7 coil, 8 ... Negative pressure switch,
9... Oil pressure switch, 10... Timer, 13... Flashing lamp, 14... Alarm.

Claims (1)

[Claims] 1. A steering switch that has two independent contacts, one of which turns ON when the steering wheel is locked, and the other turns OFF when the steering wheel is not locked.
A contact that turns to N, a door switch that turns the contact ON when the door is opened, a normally open relay coil, an 11 blinking lamp, and a hydraulic switch that turns the contact ON when the engine speed does not reach idling speed. is connected in series to a power source, and the contact of the normally open relay is inserted in parallel with the door switch, so that when the engine is stopped and the door is opened without locking the steering wheel, the flashing lamp flashes. A vehicle theft prevention device characterized by: 2. The vehicle anti-theft device according to claim 1, wherein the flashing lamp is a parking light. 3 The steering switch has two independent contacts, one of which turns ON when the steering wheel is locked, and the other turns OFF.
A contact that turns to N, a door switch that turns the contact ON when the door is opened, a normally open relay coil, a flashing lamp, and a hydraulic switch that turns the contact ON when the engine speed does not reach the idling speed. It is connected in series to the power supply, and the contact of the normally open relay is interposed in parallel with the door switch, and when the steering wheel is locked, the
Connect the contact point that becomes N, a negative pressure switch that turns on the contact point with suction negative pressure when the engine speed is higher than the idling speed, and an alarm in series to the power supply, and then connect the alarm in series to the power supply, and then turn the steering wheel on when the engine is stopped. A vehicle anti-theft device characterized in that a flashing lamp flashes when a door is opened without locking the steering wheel, and an alarm is issued when the ignition key is used when the steering wheel is locked; and when the engine is started without opening the steering wheel. .