JPS5855083Y2 - Steering lock prevention device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a steering lock forgetting prevention device.

In particular, the present invention relates to a device that issues an appropriate warning to prompt the occupant to lock the steering wheel, taking into account when the occupant forgets to lock the steering wheel when exiting the vehicle.

Furthermore, the present invention relates to a device that prevents an alarm device from operating when an accessory switch that supplies power to an accessory such as an audio device is turned on while riding in a vehicle.

Conventionally, a device for preventing forgetting to lock the steering wheel locks the ignition key from a keyway provided in a steering lock device that is linked to the ignition key, as described in Japanese Utility Model Application Publication No. 55-31727 as a conventional example. When I took out the key, the steering wheel was locked.
A steering wheel that turns the contacts OFF when the steering wheel is locked, unlocks the steering wheel when the key is inserted into the key groove and turns the key one step, and turns the contacts ON when the steering wheel is unlocked. - A series connection circuit was used between the switch and the alarm, with the contact turned ON when the door was opened, and the contact turned OFF when the door was closed.

To explain the operation using FIG. 1, the steering switch 1 and the door switch 2 both have their contacts turned OFF.
When the power supply 10 turns on the alarm 8, the alarm 8 is energized and sounds.

Furthermore, in the above publication, an oil pressure switch that detects engine rotation is inserted in series with the alarm so that the alarm does not sound while the engine is rotating, and once the conditions for activating the alarm are met, It has been proposed to provide a self-holding circuit so that the alarm continues to sound even when the door is closed.

However, these devices have the disadvantage that they issue an alarm even during short-term unloading operations or during vehicle maintenance.

This invention was created in view of the above, and the ignition
If you forget to lock the steering wheel using the key and open the door to get out of the car, the warning will continue until you lock the steering wheel, prompting you to lock the steering wheel.If you open the door while the engine is running, the warning will temporarily sound, but the door will not lock. To provide a device which stops an alarm when the vehicle is closed and does not issue an alarm when an audio equipment drive switch (accessory switch) is turned on while riding.

The present invention will be explained below with reference to an embodiment shown in FIG.

Note that the same numbers as in FIG. 1 indicate the same parts.

In the figure, reference numeral 3 denotes an engine oil pressure switch, whose contact is turned OFF while the engine is starting, and turned ON when the engine stops rotating.

Reference numeral 4 denotes an accessory switch, which enables driving of audio equipment such as a radio, stereo, and other accessory equipment, and is turned on when the ignition key switch turns on the accessory contact.

Reference numeral 5 denotes a seat switch, which detects whether the occupant is seated. In this embodiment, the switch turns on the contact when the occupant is seated, and turns off the contact when the occupant leaves the seat.

6 is a second relay consisting of a normally closed contact 6a and a coil 6C.

Reference numeral 7 denotes a self-holding circuit that performs a self-holding function for the door switch 2 when the oil pressure switch 3 is turned on, and is composed of a normally open contact 7a, a coil 7C, and a diode D1.

9 is an AND circuit which outputs when simultaneously receiving the input signal via the self-holding circuit 7 and the input signal intervening the normally closed contact 6a of the second relay 6, and outputs the signal from the relay coil 11C of the first loop 11. It acts to energize and close its normally open contact 11a.

R1 and R2 are resistors, which are AND circuit 90 input signal adjustment resistors.

A series circuit of the door switch 2, the oil pressure switch 3, the steering lock switch 1, the accessory switch 4 and the seat switch 5, and the first relay 11
One end of each of the open contacts 11 a is connected to the power source 10 .

Further, the other end of the door switch 2 is connected to one input terminal of the AND circuit 9 via the coil 7C of the self-holding circuit 7 and the resistor R1, and the other end of the oil pressure switch 3 is connected to the self-holding circuit 7.
It is connected to the connection point between the door switch 2 and the coil 7C via the normally open contact 7a and the diode D1, forming an energizing circuit in parallel with the door switch 2.

The other end of the steering switch 1 is connected to the other input terminal of an AND circuit 9 via a normally closed contact 6a of a second relay 6 and a resistor R2.

The output terminal of this AND circuit 9 is grounded via the coil 11C of the first relay 11.

Furthermore, accessory switch 4 and seat switch 5
The other end of the series circuit is grounded via the coil 6C of the second relay 6 and the diode D2, and the other end of the normally open contact 11a of the first relay 11 is grounded via the alarm 8.

Next, the operation of this embodiment having the above configuration will be explained.

While the engine is running, the oil pressure switch 3 keeps the contact OFF.

When the door opens or closes, door switch 2 turns ON or O.
Becomes FF.

When the door is opened, the door switch 2 is turned on and provides one input signal to the AND circuit 9.

The contact 7a of the self-holding circuit 7 is turned on.

However, since the oil pressure switch 3 is OFF, no power is supplied through the contact 7a.

On the other hand, the steering switch 1 is unlocked and is therefore turned on.

Therefore, the other human input signal is given to the AND circuit 9, and the AND circuit 9 issues an output signal to excite the coil 11C.
Since the contact 11a is turned ON, the alarm device 8 issues an alarm.

However, when the door is closed, the door switch 2 is turned off and one signal to the AND circuit 9 is cut off, so the AND circuit 9 stops outputting.

Therefore, the relay 11 returns to the inoperative state and contacts 11 a
is turned OFF, so the alarm stops.

When the door is opened again, one signal is given to the AND circuit 9, which outputs an output to excite the relay coil and issue the alarm again.

When the accessory switch 4 is ON and a passenger is seated in the vehicle, the relay 6 excites the coil 6C and turns its contact 6a OFF, cutting off the other signal to the AND circuit 9, and The circuit 9 stops its output, the relay 11 returns to its inoperative state, and the alarm stops.

When the engine is stopped, opening the door turns on the door switch 2.

Also, since the oil pressure switch 3 is ON, the self-holding circuit 7
When the contact 7a is closed, the self-holding circuit 7 continues to operate via the oil pressure switch 3 even if the door is closed and the door switch 2 is turned off.

Therefore, one signal to the AND circuit 9 continues until the engine is started, the oil pressure switch 3 is turned off, and the door switch 2 is turned off with the door closed.

Since the steering switch 1 is ON when the steering wheel is not locked, the other signal is given to the AND circuit 9, and the AND circuit 9 outputs the relay 1.
1 to issue an alarm.

This prompts the steering to lock.

When the steering wheel is locked, the steering switch 1 is turned OFF and the other signal to the AND circuit 9 is cut off, so the AND circuit 9 stops outputting, the relay 11 returns to its inoperative state, and the alarm stops.

By the way, the steering wheel does not lock and the steering wheel does not lock.
When switch 1 is ON and the ignition key is in the accessory contact ON position, accessory switch 4 is ON, and if the occupant is seated at this time, the seat I switch is on.
...Switch 5 is also ON, and coil 6C of relay 6
is excited and turns off its normally closed contact 6a, so the other signal to the AND circuit 9 is cut off, and the relay 11 is in an inactive state and does not issue an alarm.

In other words, when the alarm is being issued, the alarm will only be silenced when the occupant is seated and the ignition switch is placed at the accessory contact point, so the alarm will not be silenced simply by sitting down, and theft by multiple persons may occur. It is effective in preventing.

In this embodiment, one input of the AND circuit is cut off by the relay 6, but either or all of the two inputs may be cut off, or the output may be cut off.

As described above, according to the present invention, if you forget to lock the steering wheel when the engine is stopped and open the door to get out of the car, the warning will be issued until the steering wheel is locked, but while the engine is running, the warning will be issued only while the door is open. Since the alarm stops when the door is closed, the inconvenience of needlessly emitting an alarm during short-term unloading operations or vehicle inspections is eliminated.

Also, when a passenger is seated and the accessory contact is turned on and audio equipment is operating inside the vehicle, the alarm should not be emitted, and if the passenger gets up to exit the vehicle and opens the door with the audio equipment running, The system also issues a warning, improving the effectiveness of preventing the driver from forgetting to lock the steering wheel.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional steering lock prevention device, and FIG. 2 is a circuit diagram showing an embodiment of the present invention.

Claims (1)

[Claim for Utility Model Registration] A steering switch that turns on the contact when the steering wheel is not locked, an engine rotation detection switch that turns on the contact when the engine stops, a door switch that turns on the contact when the door is opened, and accessories. A series circuit of an accessory switch that supplies power to the door switch, a seat switch that is turned on when seated, and a normally open contact of the first relay are connected to a power source, and the other end of the door switch is connected to the engine. to one input terminal of the AND circuit via a coil of a self-holding circuit having a self-holding normally open contact connected in series with the rotary switch to form a current-carrying circuit in parallel with said door switch; The other end is connected to the other input terminal of the AND circuit, and the output terminal of the AND circuit is connected to the other end of the normally open contact of the first relay through the coil of the first relay. A normally closed contact of a second relay is inserted into one of the input circuits and output circuits of the AND circuit, and the series circuit of the accessory switch and the seat switch is grounded. A device for preventing forgetting to lock a steering wheel, characterized in that an end thereof is grounded via a coil of the second relay.