JPS6340713B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a warning device for an automobile that prevents the driver from forgetting to apply the handbrake and leaving the vehicle.

Ensuring that the handbrake is applied is essential from a safety perspective, but this invention makes it possible for the buzzer to sound if you forget to apply the handbrake and open the door, and the buzzer to stop sounding when you apply the handbrake. In addition, the sound of the buzzer is changed depending on whether the engine is running or when the key switch is turned off, so that a particularly strong warning is issued when the engine is running, and warnings are given according to the degree of danger. The purpose is to get it out.

That is, the present invention provides a pulse oscillator having a circuit that receives power from a battery through a door switch without going through a key switch, a buzzer that generates sound using the output of the pulse oscillator, and a buzzer that controls the oscillation and stopping of the pulse oscillator. This device is provided with a switch that is interlocked with the handbrake to be controlled, and means that is connected to the pulse oscillator via the key switch and changes the oscillation frequency of the pulse oscillator in response to opening and closing of the key switch.

Next, a description will be given based on the embodiments shown in the drawings.

In the drawing, 1 is a battery, S ₁ is a key switch, R ₁ to _{R 19} and RA, RB are resistors, C ₁ to _{C 7} are capacitors, D ₁ to D ₁₀ are diodes, Q ₁ to _{Q 5} are transistors, and 2 is a Speed sensor, 3 is a timer circuit, 4
is a pulse oscillator, _K1 to _K3 are relays, _S2 is a lighting switch, _S3 is a dimer switch, _S4 is a switch for headlight control, _S5 is a door switch that closes when the door opens, and _S6 is a handbrake. Brake switch that closes when pulled, IC ₁ and IC ₂ are integrated circuit ICs,
5 is a head lamp, 6 is a side lamp, 7 is a buzzer, 8 is a switch linked to the accelerator pedal, L
are connected by lamps as shown. In addition,
In the circuit shown in FIG. 1, when the switch 8 and the transistor _Q5 , etc. are connected as shown by the broken line, the solid line 9 for grounding the emitters of the transistors _Q3 and _Q4 is unnecessary.

First, the operation of an example without the circuit shown by the broken line connecting the switch 8, the transistor _Q5, etc. will be explained.

When the key switch _S1 is closed and the car is stopped, the permanent magnet 21 interlocked with the axle of the car is also stopped, and the reed switch 22 of the vehicle speed sensor is not turned on and off. Therefore, the transistor _Q3 of the timer circuit 3 is in a cut-off state, and the base current flows through the transistor _Q4 . When the lighting switch _S2 is closed and the daymer switch _S3 is in the position shown in the figure, the high beam of the headlamp 5 is turned on. Next, when you close Switch S ₄ ,
Relay through diode D ₅ , transistor Q _4
K1 is energized, but the headlamp remains lit.

Next, when the car is started, the magnet 21 of the vehicle speed sensor 2 rotates while the car is running, the reed switch 22 is turned on and off, and the pulse signal is amplified by the transistor _Q1 and sent to the timer circuit 3 via the capacitor _C2 . Transistor Q ₂ repeats conduction and cut-off, and as capacitor C ₃ is charged, transistor Q ₃ becomes continuously conductive, and as a result, transistor Q ₄ is cut off. Therefore, relay K ₁ is restored and
Current flows through the contact k ₁ to the coil of relay K ₂ , which activates relay K ₂ . and relay K ₂
is self-held by its contact k ₂ . Next, when the car stops by applying the brakes, etc., the pulse signal from the vehicle speed sensor 2 disappears, and the capacitor
When the charge of C ₃ is discharged to some extent through resistors R ₆ and R ₇ , transistor Q ₃ is turned off. The time from when the pulse signal disappears until the transistor Q ₃ is cut off is determined by the capacitance of the capacitor C ₃ and the resistance R ₆ ,
Although it is determined by the value of _R7 , if the time is set to about several seconds (for example, 5 seconds), transistor _Q3 is cut off, transistor _Q4 becomes conductive, and relay _K1 is activated several seconds after stopping. At this time, as mentioned above, relay _K2 is self-holding, so relay
The coil of relay _K3 is energized and activated via contacts _k1 , _k1 ' of K1 and contact _{k2 '} of relay _K2 , and headlamp 5 is turned off. At night, when the distance to the vehicle in front is short and you are slowly following the vehicle in front, especially in torque converter vehicles (automatic vehicles), you can keep your foot off the accelerator pedal and use the creep to stop and follow the vehicle in front by simply pressing the brake pedal. This may be repeated little by little, but at this time, even if a pulse signal is output from the vehicle speed sensor 2 due to a very short period of temporary forward movement, if the capacitor C ₃ is not charged above a certain level via the resistor R ₅ , the transistor Q ₃ will not be activated. No conduction. Resistance _R5 ,
By appropriately determining the value of R ₆ and the capacitance of capacitor C ₃ , it is determined that transistor Q ₃ does not become conductive during a relatively short period of time (for example, several seconds) when advancing due to creep. Therefore, when the vehicle repeatedly stops and moves forward using creep, the headlamp does not repeatedly turn off and on, but remains off. This has the advantage of not causing the inconvenience of the headlight blinking each time the vehicle moves forward or stops using creep, leading to the misunderstanding that the former driver is giving a sign. When the accelerator pedal is pressed again to start driving, the pulse signal from the vehicle speed sensor turns on transistor _Q3 , turns off transistor _Q4 , and restores relays _K1 and _K3 , turning on the headlights.

When using switch 8 that is linked to the accelerator pedal, connect switch 8 between the emitter of transistor Q ₃ and ground as shown by the broken line in Figure 1, and connect the emitter of transistor Q ₃ and ground. Remove the connected solid line 9. Also, at this time, the transistor _Q5 , the resistor _R10 , etc. are connected as shown by the broken line.

Next, the operation of an embodiment in which the switch 8 linked to the accelerator pedal is used will be described.

Lighting switch S ₂ , switch S ₄ , key switch S ₁
When the vehicle is running with the gas pedal closed and the accelerator pedal depressed, relays K ₁ , K ₂ , timer circuit 3, etc. are inactive because switch 8 is open. When you take your foot off the accelerator pedal and depress the brake pedal to decelerate, the pulse signal from the vehicle speed sensor 2 turns on transistor _Q3 , turns off transistor _Q4 , and turns on the relay.
Although K ₁ is not activated, relay K ₂ is energized via contact k ₁ , switch 8, and is self-held by its make contact k ₂ . When the car stops, several seconds later, transistor Q ₃ is cut off, transistor Q ₄ is turned on, relays K ₁ and K ₃ are activated, and headlamp 5 is turned off. At this time, a base current flows through the transistor _Q5 through the contact k1 of the relay _K1 , and the transistor _Q5 becomes conductive, thereby grounding the base of _the transistor _Q1 , thereby rendering the vehicle speed sensor 2 ineffective. Therefore, in a torque converter vehicle, when the vehicle repeatedly moves forward and stops using creep depending on how much the brake pedal is pressed while the foot is off the accelerator pedal, the head lamp 5 does not blink. Then, when the accelerator pedal is depressed, switch 8 opens, relays K ₁ , K ₂ and K ₃ are restored and the head lamp is turned on.

Pulse oscillator 4 is an astable multivibrator, and when the door of the vehicle is opened and door switch _S5 is closed, pin 1 (ground terminal) of IC and _IC1 is grounded via diode _D8 and oscillation starts. , sounds buzzer 7. IC that constitutes pulse oscillator 4
uses the well-known Mitsubishi Electric M51841P,
The interior is shown in the block diagram of FIG. This IC,
The No. 7 pin (discharge terminal) of IC ₁ is connected to one end of the handbrake switch _S6 via _R11 and to the key switch _S1 via the diode _D10 and the handbrake lamp L, as shown.

Now pull the handbrake and close the handbrake switch S ₆ , through the resistor R ₁₁ , ICIC ₁
The 7th pin (discharge terminal) of is grounded. Therefore,
The voltage at pin 7 drops.

At this time, if the resistance value is determined so that the voltage obtained by dividing the voltage of power supply 1 by resistors RA and _R11 is lower than the reference voltage inside the IC (voltage at pin 5),
Oscillation is stopped by applying the handbrake. When the door is closed, the door switch _S5 opens,
The oscillation also stops. If you forget to pull the handbrake and open the door, oscillation starts, but the oscillation frequency at this time is f ₁ ≒ 1.44 / (RA + 2RB) C ₅ when key switch S ₁ is not closed, and when key switch S ₁ is closed, When it is, the sum of the resistance value of the handbrake lamp L and the value of the resistance _R11
Since the resistance R′ is connected in parallel with the resistance RA,
If the parallel resistance value of RA and R' is RAR', the oscillation frequency f ₂ at this time becomes f ₂ ≒ 1.44/(RAR' + 2RB) C ₅ , which is higher than f ₁ . Note that C ₅ is pin 2 and pin 1.
This is the capacitance of the capacitor connected between the pins.
In this way, if you forget to use the handbrake and try to leave the vehicle, the warning buzzer 7 will sound, but regardless of whether the key switch is closed or open.
Because the pitch of the sound is different, you can easily notice if you forgot to remove the key.

FIG. 3 shows the reed switch 22 of the embodiment shown in FIG.
Magnetoresistive effect element 2 instead of a vehicle speed sensor using
This is an example using a vehicle speed sensor using IC,
An amplifier circuit 10 using IC ₂ , resistors R ₁₂ to R ₁₈ , a Zener diode D ₉ and a capacitor C ₇ amplifies the signal from the vehicle speed sensor and uses it as an input signal to the transistor Q ₁ .

According to this invention, if you forget to apply the handbrake and open the door, different buzzer sounds will sound depending on whether the engine is left running or when the engine key is turned off, with the buzzer sounding louder when the engine is running. Because the frequency is high, it is possible to issue a strong warning, and it is effective because it can warn you of forgetting to apply the handbrake and forgetting to remove the key switch at the same time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 shows the entire electric circuit, FIG. 2 shows a block diagram of IC ₁ , and FIG. 3 shows a part of the circuit of another embodiment. 1...Battery, 4...Pulse oscillator, 7...
...Buzzer, S ₁ ...Key switch, S ₅ ...Door switch, S ₆ ...Handbrake switch, L...
Handbrake indicator lamp, _R11 ...Resistor, lamp L and resistor _R11 ...Means for changing the oscillation frequency.

Claims (1)

[Claims] 1. A pulse oscillator that has a circuit that receives power from a battery through a door switch without going through a key switch, a buzzer that sounds with the output of this pulse oscillator, and a handbrake that controls the oscillation and stopping of this pulse oscillator. A warning device for a motor vehicle, comprising an interlocking switch and means connected to a pulse oscillator via the key switch to change the oscillation frequency of the pulse oscillator in response to opening and closing of the key switch.