JPH07119772B2 - Operating state recording / playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a driving state recording / reproducing apparatus for recording a change in traveling speed in an actual traveling state of an automobile and reproducing the change later to display a graph. Is.

(Prior Art) Conventionally, in a vehicle driving simulation device or the like,
Perform a pseudo driving operation by grasping the road condition from the scene displayed in front of the driver to be inspected, and calculate the engine speed and running speed of the automobile engine from the operation data of the accelerator pedal and brake pedal at this time. However, there is a device in which these data and a signal corresponding to the operation of the brake pedal are recorded and reproduced later so that the driver's driving skill and driving temperament can be analyzed.

(Problems to be Solved by the Invention) However, in the above-described conventional device, since the vehicle is not actually driven and driven, the driving operation depends on the sense of speed received by the driver to be inspected and the difference in performance between the vehicles. Is not clear, and the data does not always accurately reflect the driving skill and driving disposition of the inspected driver. For this reason, it has not been possible to accurately analyze the driving skill and driving disposition of the driver to be inspected.

The present invention has been made in view of the above circumstances. Therefore, the driving speed change data obtained from an actually driven vehicle is recorded on a magnetic tape, and the data is reproduced and displayed in a graph later. An object is to provide a state recording / reproducing device.

(Means for Solving the Problem) In order to achieve such an object, a driving state recording / reproducing apparatus of the present invention includes a speed detecting means for outputting a speed signal having a pulse period corresponding to a traveling speed of an automobile, and the speed signal. A waveform processing means for converting each of the pulses into a modulated signal in which a narrow "L" level pulse is output, and a modulating means for A1 modulating a certain frequency signal with the modulated signal and outputting a modulated signal, An addition unit for superposing another continuous frequency signal having a different frequency from the frequency signal on the modulated signal to output an added signal; and a magnetic recording unit for recording the added signal on a magnetic tape. It is configured.

Further, the speed detecting means is formed by a mark attached to a side surface of a tire and an optical sensor which is mounted on an automobile so as to face the mark and outputs a pulse each time the mark faces the mark. The means may be formed by a one-shot multivibrator that is triggered by the speed signal and outputs a modulated signal of a narrow "L" level pulse.

Then, a filter for restoring the modulated signal by removing the other frequency signal from the added signal reproduced by the magnetic recording means, and a modulation signal restoring means for restoring the modulated signal from the restored modulated signal And a D / A conversion circuit for D / A converting the pulse period of the restored modulation signal into a DC voltage, and a graph display means for displaying the output of this D / A conversion circuit in a graph. it can.

Further, a reference signal generating means for outputting a reference signal in which a predetermined frequency signal is modulated with a reference pulse, a changeover switch for selectively changing the reference signal and the reproduced added signal, and an output of the D / A conversion circuit. A variable resistor for voltage division,
Speed display means for displaying the traveling speed in accordance with the divided voltage signal, and before the graph display, the variable resistor is adjusted while the reference signal is selected by the changeover switch to display the speed display. The means may display a predetermined traveling speed according to the outer diameter of the tire to adjust the magnitude of the output of the D / A conversion circuit given to the graph display means.

(Operation) The speed signal obtained while actually driving the vehicle is recorded on the magnetic tape with a simple structure. Then, since the frequency signal that is the modulation signal is A1 modulated and another continuous frequency signal is added to the output modulated signal,
Since there is no signalless section, the AGC circuit included in the magnetic recording device does not operate excessively.

Further, since the optical sensor outputs a pulse each time it opposes the mark attached to the side surface of the tire, a pulse-shaped speed signal corresponding to the rotation speed of the tire can be obtained with a simple configuration. Moreover, since the one-shot multivibrator is triggered by this speed signal to output the modulation signal, the pulse width of the speed signal changes with the change of the traveling speed, but the pulse width of the modulation signal becomes constant.

Then, the D / A conversion output corresponding to the pulse period of the modulated signal restored from the signal to be added reproduced by the magnetic recording means is displayed in a graph, and the change in the traveling speed of the automobile becomes clear.

Furthermore, before the graph is displayed, the reference signal is selected with the changeover switch, the output of the D / A conversion circuit is appropriately divided by the variable resistor and given to the speed display means to display the traveling speed according to the tire outer diameter. When the signal to be added is selected by the changeover switch, the graph display means is provided with a predetermined output according to the traveling speed of the vehicle regardless of the difference in the outer diameter of the tire, and the proper traveling of the vehicle is performed. The speed can be displayed.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 is an overall configuration diagram showing an outline at the time of recording of an operating state recording / reproducing apparatus of the present invention, and FIG.
FIG. 3 is a block circuit diagram of an embodiment of the recorder shown in FIG. 3, and FIG. 3 is a block circuit diagram of an embodiment of a regenerator used at the time of regenerating of the operating state recording / reproducing apparatus of the present invention. FIG. 5 is a time chart for explaining the operation by showing the signal waveforms of the respective parts of the recorder and the regenerator, and FIG. 6 shows the graph display means used when reproducing the operation state recording and reproducing apparatus of the present invention. It is a figure which shows an example of the graph display obtained.

First, the outline of the entire configuration at the time of recording will be described with reference to FIG. In the automobile 10, a video camera 12 as a photographing / recording unit for photographing and recording a front scene is installed facing forward. Signals from the recorder 14 are applied to the Rch and Lch audio input terminals of the video camera 12, respectively. Engine by the audio signal recording part of the video camera 12
Magnetic recording means for recording 16 rotation speed signals and the like is configured. Then, the recording machine 14 is provided with a rotation speed signal obtained from a pickup clip 20 as rotation speed detecting means for sandwiching the cord 18 on the distributor input side for supplying a spark current to an ignition plug of the engine 16. Further, the recording device 14 is provided with a brake signal from a switch 23 as a brake pedal operation detecting means which is turned on / off according to an operation of the brake pedal 22. Then, mark 26,26 on the two sides of the concentric circle on the side of the tire 24.
Is attached, the optical sensor 28 as a speed detecting means is arranged in the tire house of the automobile facing these marks 26, 26, and each time the marks 26, 26 correspond to the optical sensor 28, they are connected to the optical sensor 28. A pulsed speed signal is given to the recording machine 14 from the amplifier unit 30. Further, a switch 32 for starting a stop instruction is connected to the recording machine 14,
Further, a stop instruction lamp 34 that is turned on after a lapse of a predetermined time from the operation of the switch 32 is connected.

Next, the configuration of the recording machine 14 will be described with reference to FIG. 2, FIG. 4 and FIG. The spark current given to the ignition from the code 18 on the input side of the distributor is radiated quite strongly, and by simply sandwiching the code 18 with the pickup clip 20, a sufficiently large level pulse-like signal corresponding to the rotation speed of the engine 16 is generated. A rotation speed signal as shown in FIG. 4 (a) is obtained at the rotation speed signal input terminal 36. This rotation speed signal is divided by the first variable resistor 38, and the divided signal is amplified by the amplifier 40 and given as a trigger for the first one-shot multivibrator 42. The first one-shot multivibrator 42 outputs a narrow "L" level pulse as shown in FIG. 4 (b) every time a trigger is applied, and this pulse-like modulated signal is the first modulating circuit. 44 and the first D / A conversion circuit 46.

Further, a brake signal that is turned on / off by operating the brake pedal 22 is given to the brake signal input terminal 48, and the waveform shaping circuit 50 removes the waveform shaping and chattering, and a signal as shown in FIG. 4 (c). As a control signal to the first carrier selection circuit 52. The first carrier wave selection circuit 52 is supplied with a first frequency signal of, for example, 10 KHz from the first oscillation circuit 54, and is supplied with a second frequency signal of, for example, 5 KHz from the second oscillation circuit 56. , 10KH when the brake pedal 22 is not depressed
5KH when the first frequency signal of z is selected and stepped on
Select the second frequency signal of z. Then, one of the selected frequency signals is given to the first modulation circuit 46, A1 modulated by the modulation signal from the first one-shot multivibrator 42, and the modulated signal as shown in FIG. 4 (d). Is output as. This modulated signal is output from the Rch output terminal 56
To the Rch of the audio input terminal of the video camera 12. Further, the first D / A conversion circuit 46 outputs a DC voltage according to the pulse cycle, and this voltage value is a voltage division selection circuit 47.
The divided pressure signal corresponding to the number of cylinders of the engine 16 is selected, and the number of revolutions of the engine 16 is displayed by a number or the like by the first engine revolution number display means 60 according to this divided pressure signal.

In addition, from the amplifier unit 30 connected to the optical sensor 28,
A pulse-like speed signal as shown in FIG. 5 (h) corresponding to the rotational speed of the tire 24, that is, the traveling speed of the automobile 10 is obtained at the speed signal input terminal 62. The section x in FIG. 5 (h) is an amplifier unit when the automobile 10 is at a low speed and the optical sensor 28 is in a state of corresponding to the marks 26, 26 for a long time.
Output from 30. This speed signal is given as a trigger to the second one-shot multivibrator 64 as the waveform processing means. The second one-shot multivibrator 64 outputs a narrow "L" level pulse as shown in FIG. 5 (i) each time a trigger is given,
This pulse-shaped modulation signal is given to the second modulation circuit 66 and the first inverting circuit 68. The second one-shot multivibrator 64 has a retrigger function, and is shown in FIG.
For an input such as the section x, the pulse corresponding to the length of the section is output. Then, to the second modulation circuit 66, either the first frequency signal of 10 KHz from the first oscillation circuit 54 or the second frequency signal of 5 KHz from the second oscillation circuit 56 is supplied to the second carrier wave. It is selected and given by the selection circuit 70. Here, the second carrier selection circuit 70 is controlled by a stop instruction signal described later, selects the first frequency signal of 10 KHz with the stop instruction signal output, and outputs the stop instruction signal without output. Selects the second frequency signal of 5 KHz. Therefore, from the second modulation circuit 66 to FIG.
As described above, the modulated signal in which the carrier wave is A1 modulated by the modulation signal output from the second one-shot multivibrator 64 is output, and is further applied to the adding circuit 74. A third frequency signal of, for example, 18 KHz having a frequency different from that of the first and second frequency signals is given to the adding circuit 74 from the third oscillating circuit 74, and the modulated signal as shown in FIG. An added signal in which the third frequency signal is superimposed on the signal is output. This signal to be added is given to the Lch of the audio input terminal of the video camera 12 via the Lch output terminal 78. Here, the third frequency signal of 18 KHz is added to the AG of the video camera 12 in the non-signal section of the A1 modulated signal.
This is to prevent the C circuit from operating excessively. A signal obtained by inverting the output of the second one-shot multivibrator 64 by the first inverting circuit 68 is given to the third one-shot multivibrator 80 as a trigger. This third one-shot multivibrator 80 operates in the up-edge, and the second one-shot multivibrator 80
Outputs pulses wider than 64 pulses. And the output of this third one-shot multivibrator 80 is
It is applied to the speed lamp 82 and is lit only during the presence of the pulse. Here, the pulse width of the third one-shot multivibrator 80 is widened because the speed lamp 82
This is for appropriately prolonging the lighting time of.

The stop signal instructing means 72 is a timer provided with a starting switch 32 and a second variable resistor 86 for adjusting time, and when a predetermined time elapses after operating the starting switch 32,
An "H" level stop instruction signal is output as shown in FIG. 9 (j) and is supplied to the second carrier selection circuit 70, and the stop instruction lamp 34 is lit via the stop instruction signal output terminal 88.

Next, a playback device 90 for displaying a graph from the playback signals of the signals recorded on the audio Rch and Lch of the video camera 12
The graph display means 112 will be described with reference to FIGS. Rc for audio signal of video camera 12
The playback signal from h is 2 via the Rch input terminal 92 of the playback device 90.
The reproduced signal from the Lch is given to the a contact of one circuit of the circuit 2-contact changeover switch 98, and the reproduced signal from the Lch is input to the Lch input terminal 94 of the reproducer 90.
Is applied to the a contact of the other circuit of the changeover switch 98 via. Then, the reference signal generated by the reference signal generating means 96 is applied to the b-contact of one circuit of the changeover switch 98 and the b-contact of the other circuit of the changeover switch 98 by A1 modulation with a pulse having a reference cycle. The Rch reproduction signal (FIG. 4 (d)) selected by the changeover switch 98 is transmitted to the first 5 KHz miss pulse detector 100 (missing pulse detector) and the first 5 KHz miss pulse detector 100 (missing pulse detector).
Of 10 KHz miss pulse detector 102. These miss pulse detectors 100 and 102 operate so as to output an “H” level signal when the input signal does not include a frequency signal having a predetermined frequency or higher. Therefore, from the first 5KHz miss pulse detector 100,
A modulated signal such as that shown in FIG. 4 (e), which is a “H” level pulse, is output while there is no signal in which the carrier wave due to one modulation is interrupted, that is, while the pulse of the first one-shot multivibrator 42 is present. It The restored modulation signal is converted by the second D / A conversion circuit 104 into a DC voltage corresponding to the pulse period, and further divided by the third variable resistor 106, and the divided signal is converted into the second divided voltage. Engine speed display means 108
Given to. Further, this divided voltage signal is given to the graph display means 112 via the rotation speed signal output terminal 110. Also,
From the first 10 KHz miss pulse detector 102 to which the Rch reproduction signal is applied, the first one-shot multivibrator 4
The carrier of the reproduced signal is 5 KHz while 2 pulses are present
A signal as shown in FIG. 4 (f), which is at the “H” level during the second frequency signal of, is output and given to the 100 KHz low-pass filter 114. And this 10KHz low pass filter
As shown in FIG. 5 (g), from 114, a brake signal which becomes "H" level only while the passage of the pulse corresponding to the first one-shot multivibrator 42 is blocked and the second frequency signal is used as a carrier wave. Is restored and given to the graph display means 112 via the brake signal output terminal 116.

Further, the added signal (FIG. 5 (l)) of the Lch reproduction signal selected by the changeover switch 98 is given to the 18KHz low-pass filter 118 which blocks passage of the third frequency signal of 18KHz and is supplied to the third The frequency signal is removed and the modulated signal of FIG. 5 (k) is restored to the second 5K as the modulated signal restoring means.
A Hz miss pulse detector 120 and a second 10 KHz miss pulse detector 122 are provided. Then, while the pulse of the second one-shot multi-vibrator 64 is present from the second 5KHz miss pulse detector 120, the fifth level becomes “H” level.
The modulated signal as shown in Figure (m) is restored and output, and the third D /
It is supplied to the A conversion circuit 124, converted into a DC voltage according to the pulse cycle, further divided by the fourth variable resistor 126, and the divided signal is given to the speed display means 128 to drive the automobile 10. Display the speed with numbers. Also,
This divided voltage signal is given to the graph display means 112 via the speed signal output terminal 130. Then, the second 10 KHz miss pulse detector 122 outputs a signal as shown in FIG. 5 (o), which is further inverted by the second inverting circuit 132 to give a stop instruction signal as shown in FIG. 5 (p). It is given to the graph display means 112 via the output terminal 134.

Furthermore, the signal from the common terminal of the Rch circuit of the changeover switch 98 is transferred to the AF amplifier via the resistor 136 and the monitor switch 138.
The amplified signal is applied to the speaker 140, and the amplified signal is applied to the speaker 142.

In such a configuration, first, the automobile 10 is set in an idling state, the voltage division selection circuit 47 of the recording machine 14 is set according to the number of cylinders of the engine 16, and the first variable resistor 38 is adjusted to adjust the first engine. The display of the rotation speed display means 60
10 Match the display of the tachometer provided by itself. With these settings and adjustments, the difference in the number of ignition noises due to the number of cylinders and the difference in the output voltage of the first D / A conversion circuit 46 was corrected for the engine speed display. Adjust the level of the resulting ignition noise that triggers the first one-shot multivibrator 42. And the car
The video camera 12 sends the rotation speed signal, brake signal, speed signal, and stop instruction signal while actually driving 10
To be recorded as a voice signal. Where the video camera 12
The signal recorded on the Rch includes the rotation speed signal according to the period of the no-signal section of the A1 modulated carrier wave and the brake signal information due to switching between the first and second frequency signals. In addition, the Lch signal includes information on the speed signal according to the period of the no-signal section of the A1 modulated carrier wave and the stop instruction signal by switching between the first and second frequency signals.

In order to display the signal thus recorded in the form of a graph, first, the reference signal is selected by the changeover switch 98 of the regenerator 90, the third variable resistor 106 is adjusted, and the number of cylinders of the engine 16 of the automobile 10 is adjusted. The engine speed is displayed on the second engine speed display means 108 to adjust the output of the second D / A conversion circuit 104 for the cycle of the pulse included in the reference signal. This is to correct the difference in the number of ignition noises obtained by one revolution of the engine 16 depending on the number of cylinders. Instead of the correction by the third variable resistor 106, the pulse output from the first 5KHz miss pulse detector 100 is divided by the variable frequency divider according to the number of cylinders, and the second D / A conversion is performed. It may be given to the circuit 114.

Similarly, adjust the fourth variable resistor 126 to adjust the tire 2
The speed corresponding to the outer diameter of 4 is displayed on the speed display means 128, and the third D / for the cycle of the pulse included in the reference signal is displayed.
The output of the A conversion circuit 124 is adjusted. This is to correct that the traveling distance in one rotation varies depending on the outer diameter of the tire 24, and a list corresponding to the outer diameter of the tire 24 may be created in advance. Of course, the speed to be set differs depending on the number of marks 26 attached to the tire 24.

Next, the changeover switch 98 is returned so as to select the reproduction signal from the video camera 12, and the graph display means 112 displays a graph simultaneously with the reproduction of the audio signal by the video camera 12. If the monitor switch 138 is turned on at the same time, the period at which the sound breaks changes depending on the rotation speed of the engine 16 and the operation of the brake pedal 22 causes 10 KHz.
The voice that switches between 5 KHz and 5 KHz is amplified by the speaker 142, and the running state of the automobile 10 can be grasped by the sound. Then, the graph display means 112 outputs a graph in which the rotation speed signal, the speed signal, the brake signal, and the stop instruction signal of the engine 16 as shown in FIG. 6 are displayed on the same time axis. From the correlation of these signals, the driving characteristics of the driver to be inspected can be analyzed while further reproducing the scene captured by the video camera 12 for reference. Then, by measuring the time t from the output of the stop instruction signal to the operation of the brake pedal 22,
It is possible to check the reaction speed of the driver to be inspected. Furthermore, due to changes in the engine 16 speed and speed, etc., the accelerator pedal and brake pedal 22
Various characteristics such as responsiveness to the operation of can be objectively known.

In the above embodiment, the Rch and Lch outputs of the recorder 14 are used as the audio input signals of the video camera 12, but the present invention is not limited to this, and may be recorded on a tape recorder or the like. Further, in order to record four pieces of information on two audio tracks on the magnetic tape of the video camera 12, two pieces of information are superposed on two output signals of Rch and Lch of the recorder 14, respectively. The tape recorder may be used to record each information on one track on the magnetic tape. Further, when two pieces of information are superimposed on one output signal, the rotation speed signal and the stop instruction signal may be combined, and the speed signal and the brake signal may be combined. And
In the regenerator 90, the means for separating the respective information from the Rch and Lch reproduction signals is not limited to the above embodiment, and may be configured by using an appropriate filter and detection means. Also,
The first, second, and third frequency signals are not limited to 10 KHz, 5 KHz, and 18 KHz, and may be set appropriately, and the predetermined frequencies of the miss pulse detectors 100, 102, 120, 122 may be set according to these frequencies. In addition, graph display means
As for 112, it is sufficient that each signal can be displayed on the same time axis, and a graph may be displayed using a CRT or the like. Also, the method of detecting the engine speed and the vehicle speed of the engine 16 is not limited to the above-described embodiment, and an existing meter or the like may be used in the automobile 10, or may be detected by another appropriate method. Further, it goes without saying that the shooting and recording of the scene in front of the automobile 10 is not limited to the video camera 12.

(Effects of the Invention) Since the operating state recording / reproducing apparatus of the present invention is configured as described above, it has the following effects.

A speed signal obtained by actually driving a car can be recorded on a magnetic tape with a simple structure. Then, since the added signal obtained by adding another continuous frequency signal to the modulated signal is recorded on the magnetic tape, there is no signalless section in the recorded signal, and the AGC circuit of the magnetic recording means in the signalless section. Does not operate excessively and noise is not recorded. For this reason, noise is not included in the modulated signal that is restored at the time of reproducing later, and the traveling speed can be accurately displayed in a graph.

Further, a speed signal according to the traveling speed of the automobile can be easily obtained with a simple configuration. And this device can be easily installed without any modification of the automobile.
Further, the pulse width of the speed signal changes depending on the traveling speed, but since the waveform is processed by the one-shot multivibrator, a modulated signal consisting of pulses of a certain width can be obtained with a simple configuration, and the signal processing in the subsequent stage is easy. .

Then, since the change in the traveling speed of the automobile is displayed in a graph, it is useful for analyzing the driving skill and the driving temperament of the driver to be inspected from the change situation of the traveling speed and the like.

Furthermore, before displaying the graph, select the reference signal with the changeover switch and adjust the variable resistor, divide the output of the D / A conversion circuit appropriately and according to the tire outer diameter with respect to the reference signal with the speed display means. If the added signal is selected with the changeover switch, the predetermined output is displayed as a graph with respect to the running speed of the car even if the tire outer diameter is different from the added signal. Further, the speed display means provided to the means can properly display the traveling speed even for automobiles having different tire outer diameters.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an outline at the time of recording of an operating state recording / reproducing apparatus of the present invention, and FIG. 2 is a block circuit diagram of an embodiment of the recording machine of FIG. FIG. 4 is a block circuit diagram of an embodiment of a regenerator used at the time of regenerating the operating condition recording / reproducing apparatus of the present invention. FIG. 4 and FIG.
FIG. 6 is a time chart showing the signal waveforms of the respective parts of the recording device and the reproducing device to explain the operation, and FIG. 6 is a diagram showing an example of a graph display obtained from the graph display means. 10: Car, 12: Video camera, 14: Recorder, 24: Tire,
26: mark, 28: optical sensor, 54: first oscillation circuit, 56: second
Oscillation circuit, 64: second one-shot multivibrator, 66: second modulation circuit, 74: addition circuit, 76: third oscillation circuit, 90: regenerator, 96: reference signal generation circuit, 98: switch Switch, 112: Graph display means, 118: 18KHz low-pass filter, 120: Second 5KHz miss pulse detector, 124: Third D /
A conversion circuit, 126: fourth variable resistor, 128: speed display means.

Claims (4)

[Claims] 1. A speed detecting means for outputting a speed signal having a pulse period according to the traveling speed of an automobile, and the speed signal is converted into a modulation signal for outputting a narrow "L" level pulse for each pulse. Waveform processing means, a modulating means for A1 modulating a certain frequency signal with the modulation signal to output a modulated signal, and superimposing another frequency signal of a different frequency from the frequency signal on the modulated signal. An operating condition recording / reproducing apparatus comprising: an addition unit that outputs an added signal; and a magnetic recording unit that records the added signal on a magnetic tape. 2. A driving state recording / reproducing apparatus according to claim 1, wherein the speed detecting means is mounted on an automobile so as to face a mark affixed to a side surface of the tire and the mark, and the speed detecting means faces the mark. And an optical sensor that outputs a pulse to the waveform processing means, and the waveform processing means is a one-shot multivibrator that outputs a modulated signal of a narrow "L" level pulse triggered by the speed signal. Characteristic driving condition recording and reproducing device. 3. The operating state recording / reproducing apparatus according to claim 1, wherein a filter for removing the other frequency signal from the added signal reproduced by the magnetic recording means to restore the modulated signal, and the restored filter are provided. A modulated signal restoring means for restoring the modulated signal from the modulated signal, a D / A converter circuit for D / A converting the pulse period of the restored modulated signal into a DC voltage, and
An operating condition recording / reproducing apparatus comprising: a graph display means for displaying the output of the D / A conversion circuit in a graph. 4. An operating condition recording / reproducing apparatus according to claim 3, wherein a reference signal generating means for outputting a reference signal in which a predetermined frequency signal is modulated by a reference pulse, and the reference signal and the regenerated added signal. A selector switch for selectively switching, and a variable resistor for dividing the output of the D / A conversion circuit,
Speed display means for displaying the traveling speed in accordance with the divided voltage signal, and before the graph display, the variable resistor is adjusted while the reference signal is selected by the changeover switch to display the speed display. Means for displaying a predetermined traveling speed according to the outer diameter of the tire and adjusting the magnitude of the output of the D / A conversion circuit given to the graph display means. .