JPS5842052B2 - How do you know what to do? - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed warning device for a vehicle, and more particularly to a speed warning device for a vehicle of a type in which the speed at which the warning is issued is set by the driver.

In conventional vehicle speed warning devices, when a vehicle exceeds a preset speed, a warning device such as a buzzer or lamp is activated to give a warning to the driver.

This scheduled speed has already been set at the factory, such as 100 ICIn/h or 50 ICfft/h, before the vehicle is delivered to the user.

However, recently the road speed limit is 207z/h.
There are many types such as , 30 Icm/h, 40/a/h, etc., and the conventional fixed type has become inconvenient.

Furthermore, if the driver wants to drive with the driving feeling he/she prefers, it is preferable to use a vehicle that can be set according to the maneuverability during actual driving.

Accordingly, a first object of the present invention is to provide a speed warning device for a vehicle that allows a driver to set a warning speed according to traffic rules or his own driving sensation under specific driving conditions.

The second object is to provide a speed warning device for a vehicle according to the first object, which can set the speed difference between the vehicle speed at which the warning speed is set and the vehicle speed at which the alarm actually sounds.

The third purpose is to detect vehicle speeds that exceed the set warning speed.
Or the first one that issues an alarm amount proportional to the traveling speed at that time.
The object of the present invention is to provide a speed warning device for a vehicle.

According to the present invention, the above first object is achieved as follows.

Connect the alarm speed setter to the output of the vehicle speed detector that converts vehicle speed into voltage.

This alarm speed setting device is a switch that keeps the output open when the set button is pressed, and keeps the output closed when the reset button is pressed.

Alternatively, it can also be reset by turning off the engine key switch.

Connect a memory circuit to the output of this alarm speed setting device.

This memory circuit memorizes the input when the input is turned off and continues to output the stored input until the human power is turned on, and when the input is turned on, it continues to output the output according to the input.

Each input of the comparator circuit is connected to the output of the vehicle speed detector and the output of the memory circuit.

When the input from the vehicle speed detector is larger than the input from the memory circuit, in other words, when the vehicle speed exceeds the alarm speed, this comparison circuit activates the next-stage alarm drive circuit to alert the driver. Give a warning.

The second object is achieved according to the invention as follows.

Connect the speed difference setting circuit between the vehicle speed detector and one input of the comparator.

This speed difference setting circuit is a circuit that issues a warning when the actual traveling speed deviates from the set warning speed by a certain amount, or sets the level thereof.

The third object is achieved according to the invention as follows.

Each input of the AND circuit is connected to a point in the vehicle speed detector that generates a pulse proportional to the vehicle speed and the output of the comparison circuit, and the output to the alarm drive circuit is modulated with a pulse frequency proportional to the vehicle speed.

Therefore, when the high speed warning speed is exceeded, the alarm is activated at a higher frequency than that of the low speed, warning the driver of a correspondingly greater danger.

According to another embodiment according to the invention, a variable frequency astable circuit is connected to the output of the comparison circuit.

This circuit generates a signal at a frequency proportional to the magnitude of the output from the comparator circuit and activates the alarm drive circuit, so that an alarm is given at a frequency proportional to the speed exceeding the set alarm speed.

As a result, the driver can determine how far the vehicle is over the warning speed.

The above description will be better understood by the following description of embodiments according to the invention with reference to the accompanying drawings, in which: FIG.

FIG. 1 is a circuit diagram showing an embodiment of a speed warning device for a vehicle according to the present invention.

When the car moves with the engine key switch EKSW closed and the contacts of the reed switch 14 are closed by the rotor-shaped magnet 12, the charges stored in the capacitor C1 are discharged through the diodes DI and D2.

Next, when the reed switch 14 opens, the engine key switch EKSW, resistor R1, capacitor CL, diode D
3. Current flows from the battery 10 through the capacitor C2, charging CI and C2.

This charging current stops when C1 is fully charged, so C
If the capacity of C2 is chosen to be smaller than the capacity of C2, C1 will be fully charged first, and the electric charge charged in C2 will be transferred to resistors R2 and R.
3 and is discharged.

As the vehicle speed increases, the next charge occurs before C2 is discharged, so the discharge current flows continuously and the potential at point A increases in proportion to the vehicle speed.

A device that generates an electric signal proportional to the vehicle speed in this manner is called a vehicle speed detector 16.

The output of the vehicle speed detector 16 is connected to the contact 20 of the alarm speed setting device 18.
The signal is supplied to the capacitor C3 of the storage circuit 22 through.

When the driver presses the set button 24 of the alarm speed setting device 18 at his desired vehicle speed, current flows through the solenoid 26, opening the contact 20 and closing the contact 28, so that the A
The voltage at the point, that is, the running speed at that time, is stored in C3.

Even if you release the set button 24, the solenoid 26 remains at contact 20.
is opened and 28 is held closed.

The field effect transistor FET1 of the storage circuit 22 continues to output the voltage stored in C3 and provides an input signal to the reference side transistor Tri of the comparison circuit 30.

The voltage at point A is divided by resistors R4 and R5 and supplied to the other input of the comparison circuit 30 via FET2.

This voltage dividing circuit 36 constitutes a speed difference setting circuit,
For example, if R4 is set to IKΩ and R5 is set to 9Ω, the voltage at point A is multiplied by 0.9 and input to the comparator circuit 30.

In other words, the vehicle speed is 10 times higher than the memorized warning speed.
% or more, the output side transistor Tr2 of the comparator circuit 30 is turned on and its output voltage decreases.

As a result, the PNP l-transistor Tr3 of the alarm drive circuit 32 is turned on, the NPN transistor Tr4 is turned on, and the alarm 34, such as a buzzer, is driven to notify the driver of overspeed.

When the driver presses the reset button 37 of the alarm speed setting device 18, the current to the solenoid 26 is cut off, the contacts 20 are closed, and the contacts 28 are opened.

As a result, the reference side input of the comparison circuit 30 is always higher than the output side input, so the drive circuit 32 is always off and the alarm 34 is not activated.

Note that the voltage dividing circuit, that is, the speed difference setting circuit 36 is connected to the resistor R4.
, R5, it may be made with a series circuit of a Zener diode and a resistor.

That is, if R4 is replaced with a Zener diode, a voltage subtracted by the Zener voltage is always input to Tr2.

In this case, rather than a relative display showing how many percentage points the alarm speed exceeds, it becomes an absolute value display showing how many /i/h it exceeds.

FIG. 2 is a circuit diagram showing another embodiment of the vehicle speed warning device according to the present invention.

Components that are the same as in FIG. 1 are designated by the same reference numerals.

A frequency divider 38 is connected to the pulse generation point B of the vehicle speed detector 16.

In this embodiment, the frequency divider 38 is a transistor Tr 5
, Tr 6 is utilized.

Since two input pulses generate one output pulse, the frequency is reduced by 1/2.

If n stages are connected, the frequency can be reduced to 1/2n.

If the frequency at point B is low, this frequency divider 38 may be omitted.

The output of the comparator 30 is connected to one side of the AND circuit 40, in this case, the transistor Tr7. It is input to the reference side input of the differential amplifier including Tr8, and the output of the frequency dividing circuit 38 is input to the output side input of the differential amplifier 40.

Then, when the vehicle speed exceeds the warning speed, the output of the comparator 30 decreases and the reference voltage of the differential amplifier 40 decreases, so that the output is modulated by the frequency of the frequency divider 38.

As a result, the alarm 34 is activated intermittently at a frequency depending on the vehicle speed, so the faster the vehicle speed, the higher the operating frequency of the alarm, giving the driver a correspondingly higher sense of nervousness.

FIG. 3 is a circuit diagram showing still another embodiment of the speed warning device for a vehicle according to the present invention.

In this embodiment, the vehicle speed detector 16 uses a tachometer 42, but as in the device shown in FIG.
It is a hot opinion that something that utilizes 4 is fine.

As the vehicle speed increases, the potential at point A rises, the base voltage of Tr2 of the comparator 30 rises, and the collector voltage of Trl rises.

As described above, in this embodiment, if the vehicle speed exceeds the warning speed, the alarm 534 is activated at a frequency proportional to the speed difference, so the driver can determine how far away from the warning speed the vehicle is.

In the second embodiment, the operating frequency of the alarm changes in proportion to the traveling speed when the warning speed is exceeded, but in this embodiment, the operating frequency of the alarm changes not due to the traveling speed but due to the deviation from the warning speed. be.

The vehicle speed warning device according to the present invention can also be used as a rotational speed warning device for engines, motors, etc.

It is also possible to automatically control speeds above the alarm speed by combining a vehicle speed limiter or the like in place of the alarm 34/1.

[Brief explanation of the drawing]

1, 2 and 3 are circuit diagrams showing respective embodiments of the vehicle speed warning device according to the present invention. 16...Vehicle speed detector, 18...Alarm speed setter, 922...Memory circuit, 30...
... Comparator, 32 ... Alarm drive circuit, 34.
...Alarm, 36...Speed difference setting circuit (
voltage divider circuit), 38... frequency divider circuit, 40...
...AND circuit, 50... Astable multivibrator, EKSW... Engine key switch.

Claims (1)

[Claims] 1. A speed warning device for a vehicle having the following requirements: (a)
A vehicle speed detector that generates an electrical signal according to the vehicle speed; (b) An alarm speed setter that is connected to the vehicle speed detector and cuts off the electrical signal from the vehicle speed detector as a set, and connects as a reset; (c) Alarm speed setting (d) A comparator that is connected to the vehicle speed detector and the memory circuit and generates an output signal when the vehicle speed exceeds the alarm speed; (e)
An alarm drive circuit that is connected to a comparator and operates the alarm using its output signal. 2. A speed warning device for a vehicle according to paragraph 1, which meets the following requirements: (a) Connected between the vehicle speed detector and the comparator, which reduces the output from the vehicle speed detector by a certain ratio and inputs it to the comparator. speed difference setting circuit. 3. A speed warning device for a vehicle according to paragraph 1 that meets the following requirements: (a) Connected between a vehicle speed detector and a comparator, which lowers the output from the vehicle speed detector by a certain value and inputs it to the comparator. speed difference setting circuit. 4. The speed warning device for a vehicle according to paragraph 1, which has the following requirements: (a) The pulse generation point of the vehicle speed detector is connected to a comparator, and the output signal from the comparator is modulated with a pulse frequency proportional to the vehicle speed. AND circuit that supplies a frequency modulation signal to the alarm drive circuit. 5 Vehicle speed warning devices that meet the following requirements: (a)
A vehicle speed detector that generates an electrical signal according to the vehicle speed; (b) An alarm speed setter that is connected to the vehicle speed detector and cuts off the electrical signal from the vehicle speed detector as a set, and connects as a reset; (c) Alarm speed setting (d) A memory circuit that is connected to the vehicle speed detector and continues to output the output from the vehicle speed detector at the time of setting; (d) A memory circuit that is connected to the vehicle speed detector and the memory circuit and generates an output signal proportional to the speed difference between the vehicle speed and the alarm speed. Comparison circuit; (e) An alarm drive circuit that is connected to the comparison circuit and drives the alarm with pulses of a constant width and a frequency proportional to the magnitude of the speed difference signal.