JPS63496Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a driving warning device for preventing sleepy driving, thinking driving, and unconscious driving in vehicles such as automobiles.

Conventionally, the concept of issuing a warning against unconscious driving by detecting the grip strength and operation frequency of the steering wheel has been known, but accurate detection is difficult and it has not been put to practical use.

This device periodically generates a caution signal sound (for example, a light sound such as a pizzling sound), and in response, the driver only has to emit a confirmation sound such as "All right ahead", but if there is no confirmation response, a loud sound is emitted. It attempts to prevent unconscious driving by generating a warning sound (for example, an unpleasant sound such as a beep).

To explain this with respect to an example electric circuit shown in the figure, 10 is a first circuit that periodically generates a warning signal.
11 is a variable period signal generator that generates a signal voltage V with a pulse width of several seconds with a variable constant period T of about 2 to 15 minutes, and 12 is a variable period signal generator that adjusts the signal period T of the signal generator. A resistor 13 is a caution signal transmitter for generating a light caution signal sound such as a chirp, and a gate circuit 14 is connected between the transmitter and the speaker 15, and the gate circuit receives the above signal. The speaker 15 is configured to sound when the voltage V is generated.
20 is for the driver to say, for example, "Alright ahead."
Audio detection circuit for detecting confirmation audio such as 2
Reference numeral 1 denotes a receiver that receives audio and generates an output according to its volume, and is installed on the driver's seat, such as the steering wheel, on the instrument panel, or on the front ceiling, where the driver's audio can be easily detected. 22 is an amplifier that amplifies the audio input signal; 23 is an integration circuit that rectifies and smoothes the output voltage of the amplifier 22 provided via the gate circuit 24; and 25 is the gate circuit that is used when the signal voltage V is not generated. An inverter 24 operates to transmit the output of the amplifier 22 to the integrating circuit 23, and an inverter 26 receives the output of the amplifier 22 via the gate circuit 27 while the signal voltage V is being generated, and rectifies and smoothes the output. 28 is an amplifier for amplifying the output of the integrating circuit at an amplification rate of less than 1;
9 is a variable resistor for adjusting the amplification factor of the amplifier; 30
is a comparison circuit that generates a comparison output when the output value of the amplifier 28 exceeds the output value of the integration circuit 23.

Note that the integration circuit 23 has a time constant of several seconds,
It has an output voltage that corresponds to the environmental noise in which the receiver 21 is placed. Also, the integration circuit 26 is approximately
It has a time constant of 100 msec and has an output voltage that immediately responds to the confirmation voice from the receiver 21.

40 is a second alarm circuit for generating a warning sound when there is no confirmation sound; 41 is a gate circuit 42; a warning signal transmitter for generating an unpleasant warning sound such as a beep through the speaker 15; 43; 50 is an inverter that acts on the gate circuit 42 and transmits a warning signal when the signal voltage V is not generated; 50 is an inverter that generates a warning sound when the driver gives an audio confirmation response such as "All right ahead"; The erase circuit 51 for stopping the signal voltage V is set by the rise of the signal voltage V, and is outputted to the gate circuit 42, and while the outputs of the flip-flop circuit 51 and the inverter 43 are supplied (from t1 _to t ₂ ) Warning signal generator 4 as shown in Figure 2 d.
1 output signal is supplied to the speaker 15 to generate a warning sound. This warning sound can be stopped after a predetermined time set by the timer 52 or by resetting the flip-flop circuit 51 by operating the manual switch 54.

Next, if the driver generates some kind of response sound while the signal voltage V is being generated (while the caution signal sound is being generated), the amplifier 22 is turned on at time _t4 as shown in Figs. 2f and 2g based on the output signal of the amplifier 22 shown in Fig. 2e.
The output voltage from the inverter 43 becomes larger than the output voltage from the integrating circuit 23, and the comparator circuit 30 generates an output pulse shown in FIG. 2h, which is supplied to the flip-flop circuit 51 through the OR circuit 53, resetting the flip-flop circuit 51. As a result, the output of the inverter 43 and the output of the flip-flop circuit 51 are not simultaneously supplied to the gate circuit 42, and the speaker 1 of the warning signal generator 41 is reset.
Reference numeral 52 denotes a timer connected to the output of the flip-flop circuit for determining the duration of the warning sound; and 53 denotes an OR circuit for resetting the flip-flop circuit 51 by either the output of a manual switch 54 provided as necessary, the output of the comparison circuit 30, or the output of the timer 52.

In a device configured in this way, Fig. 2a
When the variable period signal generator 11 generates a signal voltage V with a constant signal period I adjusted by the variable resistor ₁₂ as shown in _FIG .
During the period _from t3 to _t5 , the gate circuit 14 operates, supplies the output signal of the caution signal generator 13 to the speaker 15, and repeatedly generates the caution signal sound. This signal voltage V
With the rise of _t0 , the flip-flop circuit 51
is set, and the timer 52 is activated as shown in FIG. 2b.
The t0 _{to t2} outputs are supplied to the gate circuit 42 until it is reset by the output of the gate circuit 42. On the other hand, at time _t1 when the signal voltage V falls, the output of the inverter 43 is supplied to the gate circuit 42 as shown in FIG. 2c. (This is shown after ₅ hours t in Fig. 2d.) Note that the time constant of the integrating circuit 23 is set to a value sufficiently larger than that of the integrating circuit 26, so
It does not immediately follow short-term voice fluctuations such as the driver's confirmation voice, and by selecting the amplification rate of the amplifier 28, the presence or absence of the driver's voice can be sufficiently identified. . In addition, the inverter 25 and the gate circuit 24 operate during a time period in which the signal voltage V is not generated (most time period during the signal cycle).
However, since the generation time of the signal voltage V is extremely short compared to the signal period I, it is not necessarily necessary as long as the integration time constant is made sufficiently long.

Further, by adjusting the variable resistor 29 by the driver, the loudness of the confirmation response voice can be adjusted to an appropriate level depending on the level of surrounding noise.

In addition to the embodiment shown in the figures, this invention can easily be modified in the following ways.

The signal period T may be automatically lengthened or shortened depending on the presence or absence of a voice confirmation response.

If the alarm continues to be emitted many times, it can be used to generate a loud and heavy alarm, or to count the number of alarms with a counter, which can be used for operational management.

As is clear from the above explanation, this device automatically controls the generation of the warning sound based on the presence or absence of an audio confirmation response to the periodic warning signal sound, preventing unconscious driving, and eliminates the need for cumbersome manual operations. Moreover, by using the brain (saying things out loud), it has a remarkable positive effect on recovery from unconsciousness.

Furthermore, since it is a voice response to the generation of the warning signal sound, it is natural and easy to perform, and since it does not use hands, it does not interfere with driving. Furthermore, by providing a receiver for receiving the driver's voice in the driver's seat, the driver's voice can be reliably detected.
Moreover, even if ambient noise is mistaken for confirmation voice, this does not pose a practical problem because the confirmation operation is repeated.

[Brief explanation of the drawing]

The drawings show a driving warning device which is an embodiment of the present invention, in which Fig. 1 is an electric circuit diagram and Fig. 2 is an output waveform diagram of each part in Fig. 1. In the same figure, 10
1 is a first alarm circuit, 11 is a variable periodic signal generator, 20 is a voice detection circuit, 30 is a comparison circuit, 40
5 is a second alarm circuit, 50 is an erase circuit, 52 is a timer, and 54 is a manual switch.

Claims (1)

[Scope of utility model registration request] A first alarm circuit that periodically generates a warning signal sound, a second alarm circuit that generates a warning signal sound after a predetermined time after the warning signal sound is generated, and is provided in the driver's seat,
a receiver that receives sound and generates an output according to the volume thereof; a first means that generates a voltage according to the environmental sound volume from the output of the receiver; comparing the outputs of the first means and the second means with a second means for generating a voltage according to the output from the second means;
a comparison circuit that generates an output when the output of the second means is greater than the output of the first means;
a voice detection circuit that detects the driver's confirmation response voice after the warning signal sound is generated, and an erasure circuit that controls the second alarm circuit according to the output of the voice detection circuit and prevents the generation of the warning signal sound. A driving warning device characterized by: