JPH0518701Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vehicle speed notification device that allows audible identification of whether the current traveling speed is within a predetermined vehicle speed range.

Generally, the driving speed of a vehicle is determined visually by the driver looking at the speedometer, but when accelerating, cornering, etc., the driver's vision is mainly focused on understanding the external situation. As a result, vehicle speed information could not be obtained and there was a risk of unexpected situations such as overspeeding.

For this reason, various devices for notifying vehicle speed information by sound have been studied, one of which is shown in FIG. 1. This is a vehicle speed notification device that enables auditory identification of whether the current traveling speed is within a predetermined vehicle speed range. First, the configuration will be explained based on Fig. 1. The generating circuit 1 outputs a vehicle speed signal (Fig. 2 a') with a voltage value proportional to the vehicle speed, and a permanent magnet rotor 2a rotates in proportion to the vehicle speed, and contacts are turned on and off according to the rotation of the rotor 2a. a vehicle speed sensor 2 consisting of a reed switch 2b, a waveform shaping circuit 3 that shapes the output pulse of the vehicle speed sensor 2, and a unit that outputs a pulse with a constant pulse width based on the output pulse of the waveform shaping circuit 3. It consists of a stable multi-valve regulator 4 and an integrating circuit 5 that integrates the output pulses of the monostable multi-valve regulator 4.

The detection circuit 6 detects that the voltage value of the vehicle speed signal (a' in FIG. 2) is within a predetermined vehicle speed range, for example, 60 km/h to 80 km/h,
Three voltage ranges V ₁ to V ₂ corresponding to three vehicle speed ranges of 80 Km/h to 100 Km/h and 100 Km/h or more,
V ₂ to _{V 3} and V ₃ or higher is detected and a detection signal (e', Fig. 2, It outputs f' and g', and a vehicle speed signal (a' in Figure 2) is supplied to each non-inverting input terminal, and a voltage value corresponding to a vehicle speed of 60 km/h is supplied to each inverting input terminal.
V ₁ , voltage value V ₂ and vehicle speed corresponding to a vehicle speed of 80km/h
Three voltage comparators 7, 8, 9 each supplied with a voltage value V ₃ corresponding to 100 km/h, and the respective output signals of the voltage comparators 7, 8, 9 (Fig. 2b',
c', d') or the inverter 10, 11 of the output signal
The AND circuits 12, 13, and 14 respectively input the inverted signals obtained through the input terminals and output the logical products of the inputs to the respective output terminals 6a, 6b, and 6c.

The oscillation signal generating circuit 15 operates within the predetermined vehicle speed range, that is, 60 Km/h to 80 Km/h, 80 Km/h to 100 Km/h.
It outputs oscillation signals (h', i', j' in Figure 2) with three different oscillation modes set corresponding to three vehicle speed ranges of Km/h and 100 Km/h or more. , an oscillation circuit 16, a frequency dividing circuit 17, AND circuits 18 to 21, and an OR circuit 22.

The selection circuit 23 selects a detection signal (second
When an oscillation signal (h', i' or j' in Fig. 2) is output in a preset oscillation mode corresponding to the output detection signal (Fig. 2 h', i' or j'), )
It is composed of AND circuits 24 to 26 and an OR circuit 27.

The driver (first driver) 28 amplifies the output signal (n' in FIG. 2) from the selection circuit 23 and drives a sound generator 29 such as a buzzer.

Next, set the predetermined vehicle speed range to 60Km/h to 80Km/h,
There are three types: 80Km/h to 100Km/h and 100Km/h or more, and taking as an example the case where the current vehicle speed is 90Km/h, refer to the signal waveform diagram in Figure 2 for the operation of the vehicle speed notification device with the above configuration. I will explain while doing so.

First, the vehicle speed signal generating circuit 1 outputs a vehicle speed signal a' corresponding to the vehicle speed to the detection circuit 6. The detection circuit 6 outputs a detection signal f' indicating a predetermined vehicle speed range corresponding to the vehicle speed signal a', in this case, since the vehicle speed is 90 Km/h, the vehicle speed range is 80 Km/h to 100 Km/h, to the selection circuit 23.
The AND circuits 24 to 26 are each provided with one input terminal, to which the oscillation signal generating circuit 15 outputs three types of oscillation signals having mutually different oscillation modes.
In this case, only the AND circuit 25 receives the detection signal f' at its other input terminal, so the selection circuit 23 selects and outputs the signal l', which has the same oscillation mode as the oscillation signal i', to the driver 28 via the OR circuit 27 as the output signal n'. The driver 28 amplifies the input signal n' and outputs it to the sound generator 2.
Drives 9.

Note that each voltage comparator 7 of the detection circuit 6,
The reference voltages V ₁ , V ₂ , and V ₃ of 8 and 9 can be set arbitrarily from the outside.

However, in such a vehicle speed notification device, the notification sound notifying that the vehicle speed is within a predetermined vehicle speed range continues to sound as long as the vehicle speed is within the predetermined vehicle speed range, so that if the notification sound continues to sound, for example, when the vehicle is traveling at a constant speed within the predetermined vehicle speed range to be notified, the notification sound may be felt to be extremely annoying and may hinder safe driving.
60Km/h to 80Km/h, 80Km/h to 100Km/h, 100
If the alarm sound is continuously set to a multiple number of speeds of 60 km/h or more, the vehicle speed range over which the alarm sound continues to sound becomes extremely wide, for example, 60 km/h or more, which is undesirable in practical use.

This idea was created by focusing on these conventional problems, and it generates a relatively loud notification sound only for a predetermined period of time when the vehicle speed falls within a predetermined vehicle speed range that should be notified, and then By configuring the notification sound to have a relatively low volume,
The purpose is to solve the above problems.

This invention will be explained below based on the drawings.

FIG. 3 is a diagram showing an embodiment of this invention. First, the configuration will be explained. Components in FIG. 3 that are the same as those in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted. Further, the signal waveforms at each point a to p in FIG. 3 are shown in FIG. 4 a to p, respectively.

The trigger signal generation circuit 30 generates output signals (fourth
It detects the logical inversion points (edges) in Figures b, c, and d) and outputs a trigger signal (Figure 4 e).
(active high) inverters 31, 32, 33,
Resistors 34, 35, 36, capacitors 37, 38,
39, (active low) inverter 40, 41,
42, exclusive OR circuit 43, 44, 4
5 and an OR circuit 46.

The timer circuit 47 is triggered by a trigger signal (FIG. 4e) and performs a timing operation for a preset time, e.g., 10 seconds, or for a predetermined time arbitrarily set from the outside, e.g., 5 to 60 seconds. During this time, a timer signal (FIG. 4f) is output, and this timer signal is supplied to a switching circuit 48, which will be described later.

The switching circuit 48 switches the output signal (Fig. 4 p) from the selection circuit 23 to two drivers (first driver) to be described later depending on the presence or absence of the timer signal (Fig. 4 e).
28 and (second driver) 52, and AND circuits 49, 50 and inverter 5.
Consists of 1.

The driver 52 is set to an amplification factor such that the operating sound of the sound generator 29 caused by the driver 52 is smaller than the operating sound of the sound generator 29 caused by the driver 28 .

Next, the operation of the apparatus of this embodiment having such a configuration will be explained with reference to FIG.

First, when the vehicle speed initially enters the predetermined vehicle speed range to be reported, the trigger signal generation circuit 30 outputs the trigger signal e to the timer circuit 47. The timer circuit 47 receiving the trigger signal e performs a timing operation only for a predetermined period of time, and outputs the timer signal f to the switching circuit 48 during that time. The switching circuit 48 to which the timer signal f is input, selects and outputs the signal m from the selection circuit 23 as an oscillation signal (j, k or l) corresponding to a predetermined vehicle speed range, during the period when the timer signal f is input. is supplied to the driver 28 as a signal n. Since the amplification factor of the driver 28 is set to be relatively large, the sound generator 29 generates a relatively loud notification sound until a predetermined period of time has elapsed after the vehicle enters a predetermined vehicle speed range to be notified.

Next, when the vehicle travels at a speed within the aforementioned predetermined vehicle speed range for more than the aforementioned predetermined time, the trigger signal generation circuit 30 does not output the trigger signal e unless the vehicle speed shifts to another vehicle speed range, so the timer circuit 47
does not perform a new timing operation, therefore, the switching circuit 48 converts the signal m output from the selection circuit 23 into the signal o.
The signal is supplied to the driver 52 as a signal. Since the amplification factor of the driver 52 is set smaller than that of the driver 28, the sound generator 29 to which the signal p outputted by the driver 52 is input generates a relatively low volume notification sound.

It goes without saying that the various logic circuits in the above embodiments may be constructed using an on-vehicle microcomputer.

As explained above, according to this idea,
Its configuration includes an oscillation signal generation circuit 15 that outputs an oscillation signal in an oscillation mode set corresponding to a predetermined vehicle speed range, and a timer circuit 47 that is triggered by a trigger signal and outputs a timer signal for a predetermined period of time.
, the timer signal from the timer circuit 47 is input, and the output signal of the selection circuit 23 is sent to the first driver 2.
8 to the second driver 52, so that when the vehicle speed falls within the predetermined vehicle speed range to be notified, the timer circuit 4
It is possible to output a relatively loud notification sound only for the time set in 7, and then output a low volume notification sound.For example, when driving at a constant speed within a predetermined vehicle speed range that should be notified. Even when setting multiple vehicle speed ranges in succession, the notification sound does not feel bothersome, and the notification sound continues to be output even at a low volume, which is good for the driver's mental health. Preferably, the effect of reducing interference with safe driving can be obtained. Further, since only one sound generator 29 for outputting the notification sound can be used to switch between high and low volume, the installation space does not become large.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional vehicle speed informing device, Fig. 2 is a signal waveform diagram thereof, Fig. 3 is a block diagram showing an embodiment of the vehicle speed informing device according to this invention, and Fig. 4 is its signal waveform diagram. FIG. 1...Vehicle speed signal generation circuit, 6...Detection circuit, 1
5...Oscillation signal generation circuit, 23...Selection circuit, 2
8, 52... Driver, 29... Sound generator, 30...
...Trigger signal generation circuit, 47...Timer circuit, 4
8...Switching circuit.

Claims (1)

[Scope of utility model registration request] A vehicle speed signal generating circuit 1 that outputs a vehicle speed signal with a voltage value proportional to the vehicle speed; and a detection signal whose logic is inverted when detecting that the voltage value of the vehicle speed signal is located in a voltage range corresponding to a predetermined vehicle speed range. an oscillation signal generation circuit 15 that outputs an oscillation signal in an oscillation mode set corresponding to the predetermined vehicle speed range; A selection circuit 23 that selectively outputs a signal, and a first driver 28 that amplifies the output signal of the selection circuit 23 and drives the sound generator 29.
A vehicle speed notification device comprising: a trigger signal generating circuit 30 that detects the logical inversion point of the detection signal and outputs a trigger signal; and a trigger signal generating circuit 30 that is triggered by the trigger signal and outputs a timer signal for a predetermined period of time. A timer circuit 47, a second driver 52 that amplifies the output signal of the selection circuit 23 with a smaller amplification factor than the first driver 28 and drives the sound generator 29, and inputs the timer signal from the timer circuit 47. and a switching circuit 48 for switching and supplying the output signal of the selection circuit 23 from the first driver 28 to the second driver 52.