JPS63166640A - Abnormality alarm device for seat belt - Google Patents

Abstract

PURPOSE:To prevent forgetting to wear a seat belt by providing switches for detecting the wear of a belt, the lock of a belt, and the opening/closing of a door and operating an alarm each time when detecting that a defined time elapsed after operating an Ig., that a lock is not operated while a door is closed, or that a door is opened while driving an engine. CONSTITUTION:A power source circuit 12 and a timer 13 are connected to a storage battery via an ignition switch 2. Seat belt switches 3a, 3b which are opened when a seat belt is worn and closed when it is removed, sensors 4a, 4b which lock the seat belt by detecting that the belt is suddenly pulled, door switches 5a, 5b which are closed when a door is opened while opened when the door is closed, and a speed detecting switch 7 are provided in the captioned device. When detecting that a defined time elapsed after operating an ignition, that a lock is not operated while a door is closed, or that a door is opened while driving an engine, the alarm is operated by means of lamps 9a, 9b, 10 and a buzzer 11. Thereby, a rider is reminded of wearing the seat belt preventing forgetting to wear the seat belt.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a seatbelt abnormality warning device that particularly improves occupant stability. (Prior Art) Heavy vehicles such as automatic umbrellas are usually equipped with seat belts for restraining occupants, and the safety of the occupants is ensured by wearing the seat belts. The wearing of seatbelts is becoming increasingly important, especially in the driver's and passenger's seats. One end of this seatbelt is attached to the door for getting on and off, and the other end is attached to the side of the seat opposite to the door for getting on and off, and a sensor (f) is attached to the part attached to the door for controlling the lock function. There is a passive seatbelt.In other words, the sensor detects when the seatbelt is suddenly pulled, and the seatbelt is locked.Also, when the door is opened, the seatbelt is locked. The cancel solenoid of the sensor is activated to release the seat belt lock function.

(Problems to be Solved by the Invention) By the way, the passive seat belt as described above temporarily releases the locking function when the door is opened to make it easier for passengers to get on and off the vehicle, and then locks it again when the door is closed. Although the system is designed to set the lock function, it is not possible to confirm that the lock function has been reset, leading to problems such as forgetting to fasten the seat belt and reducing safety.

This invention was made with a focus on this problem, and provides a seatbelt abnormality warning that can prevent people from forgetting to fasten their seatbelts, improve safety, and prevent so-called door ajar situations. It provides equipment.

(Means for Solving the Problems) The seatbelt abnormality warning device of the present invention includes a seatbelt switch that detects whether the seatbelt is fastened or released;
A sensor detects when the seatbelt is suddenly pulled and locks the seatbelt, a door switch detects opening/closing of the door, and an alarm 1'T 1st stage to notify of an abnormal condition. , which drives the navigation alarm means for a predetermined period of time after the ignition switch is closed, and when the seat belt is not locked by the sensor when the door is closed or when the door is opened while the engine is running. It is equipped with an alarm control circuit that drives the alarm means.

(Function) The alarm I4181 circuit drives the alarm means for a predetermined period of time after the engine starts.During this time, it is confirmed whether the alarm lamp etc. are normally lit.Also, when the door is closed, the seat belt is locked. If this is not done or if the door is opened while the engine is running, the above warning means is activated.Therefore, it is possible to easily confirm whether the seat belt is not fastened or the door is left ajar.

〔Example〕

FIG. 1 is a circuit diagram showing one embodiment of the present invention. 1 is the vehicle battery, 2 is the engine ignition switch, and 3a and 3b are seatbelt switches that detect whether the seatbelts on the driver's seat and passenger's seat are worn, respectively. It turns ON when released.

4a and 4b are sensors for detecting and locking the seat belts when the seat belts on the driver's seat and passenger's seats are suddenly pulled; 5a and 5b are sensors on the driver's and passenger's seats. This is a door switch that detects the opening and closing of the door; it turns ON when the door is open and turns OFF when the door is closed. Cancellation solenoids 6a and 6b are connected to the door switches 5a and 5b, and cancel the seat belt locking function when the door is opened, and set the locking function when the door is closed. Reference numeral 7 denotes a switching element that is turned on when the traveling speed exceeds a predetermined value (for example, 15 to 176 or above), and is connected to the ignition switch 1.
is connected to. Reference numeral 8 denotes lamps 9a and 9b as alarm means according to signals from the above-mentioned switches.

10 and the buzzer 11, lamps 9a and 9b are for the driver's seat side and passenger's seat side seat belt alarms, and a lamp IO is for the door alarm. 10 and buzzer 1! is connected to ignition switch 1.

In the alarm control circuit 8, 12 is a power supply circuit that converts the battery voltage into a predetermined DC voltage Vdd, 13 is a timer for driving each pump for a predetermined period of time after the engine is started, and 14 is a power supply circuit that converts the battery voltage into a predetermined DC voltage Vdd. A timer for generating an alarm for a predetermined time when the seat belt is opened or when the seat belt is not fastened; 15 is a vehicle speed detection circuit; 16 is an oscillation circuit that outputs a constant cycle pulse signal while the engine is running; 17a, 17b;

18.19 are drive circuits 20a, 20b for the lamps 9a, 9b, 10 and the buzzer IO, respectively.

21 is a delay/holding circuit having OR gates AI, Am, and As, each including a series circuit of resistors R1, R2, Ft3, and capacitors C1, C2, and C3. A,
, Ai is an OR gate, 81-B is an AND gate, C
, , C2 are NOR gates, and D1 to D are NAND gates.

Next, the operation of the abnormality alarm device configured as described above will be explained for each alarm.

b) Lamp check function When the ignition switch 2 is turned on (closed), the timer 13 outputs an L (low) level signal for a predetermined period of time, and
The outputs of the ND gates 84 to B6 become the output terminals, and the drive circuits 17a, 17b, 18 turn on the alarm lamps 9a, 9.
b, 10 lights up for a predetermined period of time. As a result, each lamp 9a, 9b, 10 and drive circuit 178° 17
You can check whether there are any abnormalities in b, 18, etc.

口) Sensor check function If the sensor 4a (4b) fails and the seat belt is not locked when the door switch 5a (5b) is OFF (door closed), the sensor 4a (4b) is OFF. At this time, the human power of AND gate B2 or B3 both becomes H (high) level, and the output becomes H level.
The output of OR gate AI (A2) becomes H level. This H level signal is connected to resistor R1 (R2) and capacitor C1 (C2) in consideration of chattering and lock set time.
is delayed by NAND gate D1 (B2) and OR gate A4 (As) at the same time as OR gate AI
With the help of (A2), OR gate A+ (A2) continues to output an H level signal. And this OR gate A
+(A2) and the output fa of the oscillation circuit 16, the NAND gate DI(B2) outputs the H level/'L level signal to the NAND gate D3 and the AND gate B4.
(1), and AND gate B4 (B5) outputs a control pulse according to the signal input to drive circuit 1 phase a (17b).
). Now, the drive circuit 17a (17b) repeats ON10FF, and the lamp 9a (9b) blinks.

In addition, the output pulse of NAND game) B3 is generated by the oscillation circuit 16.
It becomes the input of AND gate B7, and this A
The drive circuit 19 is driven by the output pulse of the NDNO gate.
repeats ON10 F F, and buzzer 11 sounds intermittently. In this way, the warning is emitted from both the lamp 9a (9b) and the buzzer to alert the occupants.

At that time, by sending an H level signal to OR gate A4 (A), the output is prevented from going to L level, and the lighting of lamp 9a (9b) is caused by the NAND gate D
Priority is given to the signal from I(B2). Incidentally, the blinking of the lamps 9a (9b) and the alarm by the buzzer are not canceled until the ignition switch 2 is turned off.

C) Door check function When the engine is running, the door switch 5a (5b) is turned on (
When the door opens), the ANDNO gate opens.

An L level signal is output to B6, and an L level signal is output from the timer 14 for a predetermined period of time due to the L level output of the ANDNO gate, during which time the output of the NAND gate D3 becomes H level. This H level signal and the output pulse of the oscillation circuit 16 cause the output of the AND gate B7 to repeat H level/M level, thereby causing the drive circuit 19 to repeat ON10FF, and the buzzer 11 to sound intermittently for a predetermined period of time. Also, the ANDNO gate is also the door switch 5.
In response to the signal from a (5b), an L level signal is output, the drive circuit 18 is activated and the lamp 10 is lit, which continues until the door is returned to normal. In this way, lamp 1
0 and buzzer 11 indicate that the door is ajar when driving, or that the seatbelt is closed.
The crew is informed of the engine status for a predetermined period of time.

2) Door check function during high-speed driving If a door opens during high-speed driving, for example at 15+ o/h, the following actions are performed in addition to the actions described in (c) above. That is, while driving at high speed, the vehicle speed detection circuit 15 outputs an L level signal, and this signal and the door switch 5a (
NOROR gate A is activated by the L level signal from 5b).
The output of 42) becomes H level, and the OR gates A+ and A
s (At, A3). The operation after the H level signal is input to this OR gate AI (A2) is the same as the operation in (D) above, so it will be omitted, but when the H level signal is input to the OR gate A3, its output will be H
level, and this output is delayed by resistor R3 and capacitor C3 and becomes the inverter's power, and at the same time O'
It will also be used as manpower for R Gate A3. Therefore, OR gate A
3 continues to output an H level signal. At this time, the resistors R and I and the capacitor C3 prevent the signal from being released from the held state due to chattering or the like. Then, the signal inverted to L level by inverter I is AND
The L from this AND gate B6 is manually input to gate B6.
The drive circuit 18 is activated by the level signal, and the lamp 10 continues to be lit. The alarm caused by the lighting of the lamp 10 is not canceled until the ignition switch 2 is turned off.

e) Seatbelt check function When seatbelt switch 3a (3b) is turned ON (released), AND gate B and OR gate A4 (AS
) is manually inputted with an L level signal.

The operation after an L-level signal is manually input to the AND gate Bl is the same as that in (c) above, so it will be omitted, but when an L-level signal is input to the OR gate A4 (As), this OR gate A4 The output of (As) is the OR gate A+(A2
) becomes L level only when the output becomes L level. At this time, AND gate B4 (B';) is connected to drive circuit 17.
a (17b) and lights up the lamp 9a (9b). This notifies the occupant that the seat belt is not fastened.

Each alarm operation has been described separately for each function, but as mentioned above, in this embodiment, when the seatbelt is not fastened, the lamp 9a (9b) lights up, which prevents forgetting to fasten the seatbelt, and prevents vehicle collisions. This improves the safety of passengers when In addition, it is possible to prevent the door from being left ajar, and the abnormal state of the seatbelt is given top priority, so reliability is improved.

In the above description, the delay holding circuit 20a.

20b and 21 may be a series circuit including an OR circuit 22, a delay circuit 23 for delaying the signal of the OR circuit 22, and a holding circuit 24, as shown in FIG.

(Effects of the Invention) As described above, according to the present invention, the alarm means is driven for a predetermined period of time after the -r ignition switch is closed, and the seat belt is locked by the sensor when the door is closed. Since the alarm system is activated even if the door is opened while the engine is running, it is possible to prevent forgetting to fasten the seat belt.
This has the effect of improving safety and preventing the door from leaving the door ajar.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIG. 2 is a circuit diagram of another embodiment of the delay holding circuit of FIG. 2.-1 Ignition switch 3a, 3b---Seat belt switch 4m, 4b---
Sensors 5a, 5b=-Door switch 8...-Alarm control circuit 9a, 9b, 10--Lamp 11--Buzzer 13.14--Timer 15--Vehicle speed detection circuit 16--Buzzing circuit

Claims (4)

[Claims] (1) A seatbelt switch that detects whether the seatbelt is fastened or released, a sensor that detects and locks the seatbelt when it is suddenly pulled, and a sensor that detects the opening and closing of the door. door switch and
and an alarm means for notifying an abnormal state, and the alarm means is activated for a predetermined period of time after the ignition switch is closed, and when the seat belt is not locked by the sensor when the door is closed or when the engine is running. 1. A seatbelt abnormality warning device, comprising an alarm control circuit that drives the warning means when a door is opened. (2) The seat belt abnormality warning device according to claim 1, wherein the warning means comprises a plurality of lamps and a buzzer. (3) The seatbelt abnormality warning device according to claim 1 or 2, wherein the warning control circuit issues a warning when a door is opened while the vehicle is traveling at a predetermined speed or higher. (4) The seatbelt abnormality alarm device according to any one of claims 1 to 3, wherein the alarm control circuit issues an alarm when the seatbelt is released.