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JPS52112928

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DESCRIPTION JPS52112928
Name of the invention 1 Title of the invention 2 Waiting claim 1 The basic oscillator which
generates a carrier wave of a constant frequency. An ultrasonic transducer receiving a carrier
wave from the basic implant and emitting an ultrasonic wave and receiving an echo from the
obstacle B; and a pulse gold-based receiver indicating echo reception of the ultrasonic
transducer. Switching means for reading the ultrasonic transducer to the basic oscillator and the
receiver after ultrasonic emission and echo reception respectively, and the switching means and
the receiver connected to the super oscillator. A gate circuit that generates a pulse corresponding
to a time obtained by subtracting a fixed time from the time until echo reception, and a display
unit that receives the pulse from the gate circuit and displays the distance to the obstacle.
Obstacle detection device for automobiles. 2 and # The display unit is installed in the vehicle
compartment, and the seven other units other than the display unit are installed outside the
vehicle, and the obstacle for automatic JLL according to claim 1 characterized in that the display
unit is characterized by: # L Object detection device. 3. The IFF claim 1 or claim 3 characterized
in that the ultrasonic transducer has a diaphragm made of gimper wood for reducing the fall
tumbling t of ultrasonic v '# 5 radiation. An obstacle detection device for an automobile
according to claim 2. 4, @ Note: The switching means is a pulse generator that divides the carrier
wave from the basic generator and stores the pulse, and the pulse from the pulse generator
receives the pulse from the pulse generator, and the nU super harmonic wave transmitter /
receiver is basically 1 itr note A billing device comprising: a launcher or a duplexer connected for
each of the expenses. 5. The thr pulse generator is characterized in that a pulse having a width
between the constant #s larger than the attenuation vibration duration after the ultrasonic wave
emission of the ultrasonic transducer is supplied to the gate circuit. The hour hand bill of charge
J1! The obstacle detection device for vehicles according to paragraph 4.
Automatic i # 1 failure device
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3. Detailed Description of the Invention EndPage: The present invention relates to the
improvement of an obstacle detection apparatus for automobiles using ultrasonic waves.
Conventionally, as an obstacle detection device using ultrasonic waves. CW (continuous wave)
system that emits ultrasonic waves continuously. There is a pulse system that emits ultrasonic
waves in pulses. Since the CW method is inferior in distance detection capability, a pulse method
in which the distance detection capability is loved is often used. The obstacle detection device
based on this pulse system comprises a transducer used for transmission and reception of
ultrasonic waves, a Jl transmitter for generating a carrier wave of ultrasonic pulses, a receiver, a
second oscillator, and a second oscillator. Controlled by the output of the transmitter / receiver,
the first oscillator is connected to the transmitter / receiver at the time of transmission, and the
transmitter / receiver is connected to the receiver at the time of reception; With a detector that
detects the distance to the obstacle based on the time difference from the launch to the reception
of the echo. And a display for displaying the distance. However, this configuration is complicated
because it has a second oscillator in addition to the six first oscillators, and vibration of the
transducer at the time of ultrasonic pulse emission by connection of the first oscillator and the
transducer. Even if it is included in the initial stage of echo reception, it remains as a reduced
vibration and it is not easy to detect a close range (like this phenomenon is called m and t below
5). It is prone to malfunction due to noise such as tire noise, and furthermore, it is necessary to
provide the sensor part and the display part inside the passenger compartment and the
passenger compartment, respectively, and the wiring connecting the sensor part and the display
part becomes huge. The present invention has been made to solve the above-mentioned
drawbacks. By measuring the time # until the echo reception after a certain period of time after
ultrasonic wave emission, the distance to the obstacle is indicated by H small. The purpose is to
make an obstacle detection device for automobiles without blinding phenomenon, and the
configuration is simple, and XII: easy to detect distance object images. An object of the present
invention is to provide an obstacle detection apparatus for an automobile which is resistant to
environmental noise and easy to wire between a sensor part and a display part. The present
invention will be described below with reference to the embodiments shown in the attached
drawings. In FIG. 1 showing a block diagram showing the entire configuration of the first
embodiment of the present invention, 1 is a basic oscillator for generating a basic signal a used
as a carrier wave of emitted ultrasonic waves, and 2 is a basic signal a. A pulse generator that
performs frequency division and logic operation as a clock input signal and generates a
transmission / reception switching signal d and a gate circuit division signal #e. 3 receives the
transmission / reception switching signal d and connects the basic oscillator l to the transmitter /
receiver 4 when transmitting. Send / Receive at Reception?
Bi, a duplexer connecting the unit 4 to the amplifier 5; 4 is an ultrasonic wave transmission (IJ
and transducer used for reception, 6 is a band pass filter connected to the amplifier 5 to remove
signals due to interference caused by malfunction, 7 is connected to the mounting pass filter 6 8
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is a comparator connected to the detector 7 to output an It rescue output signal. The band pass
filter 6, the detector 7 and the comparator 8 constitute a receiver. 9 receives the comparison
output signal from the comparator 8, the gate circuit control signal e from the pulse generator 2,
the distance clock signal 1 from the distance clock generator 1 ° as an input signal, and outputs
the gate circuit output signal j In the gate circuit, A indicates a seven sense portion. 11 is an IIi
separation counter using the gate circuit output signal j from the gate circuit 9 as an input signal.
12 # 'i distance power uta 1xK connected display and. B shows a display part. The pulse
generator 2 and the gate circuit 9 are illustrated in FIG. 2A. The pulse generator 2 has a clock
input terminal cp and a frequency divider 2a that generates a signal divided by 2n at the Qn
terminal. Gate 2b. 20, a NOR gate 2d, a NAND gate) 29 and a latch 70g consisting of 2f, and an
inverter 2g. On the other hand, the gate circuit 9 is an inverter 91L, 9 (i, 7 switches 70f
consisting of WAND gates 9b, 9c, NOR gate 9θ. It comprises an AND gate 9f. In FIG. 3 showing
the configuration of the ultrasonic transducer used as the transducer 4 in the present
embodiment, 41 is a support that is connected to the transmission / reception switch 642 that
supports the electrode 41, and 43 is a ceramic transducer 44. And a support body 42. 45 is a
diaphragm, and the diaphragm 45 is fixed to the ceramic vibrator 44 by the fixture 46, and the
ceramic vibrator 44 and the diaphragm 45 are fixed via the fixture 46. EndPage vibrates in
unison. Reference numeral 47 denotes a tamping department such as silicone rubber, which is
coated on the diaphragm 45. Pulse generator 2. Transducer 4. The components other than the
gate circuit 9 are all well known, and the detailed explanation thereof will be omitted. As shown
in FIG. 4, the sensor portion A and the display portion are respectively installed outside the rear
compartment and in the passenger compartment of the automobile and electrically connected to
each other by one signal line 100. なお。 It is also possible to install the sensor unit outside the
front or the side of the vehicle outside the vehicle. Next, in the above-described configuration, the
operation is carried out using the signal waveform diagram of FIG. 5 as I5!
Light up. , In Figure 55. (A) shows the basic signal a generated more than the basic oscillator 1.
(B) shows the output signal of the pulse generator 2 ONANDG) 21), (C) shows the Q9 terminal
output signal C of the frequency divider 2a of the pulse generator 2 and 2 (d) shows the
transmission / reception switching signal d , (61J indicates a gate circuit control signal θ. (F)
shows the mechanical vibration of the diaphragm 45 of the transducer 4, in which f1 is an
excitation for aiming at the emission of an ultrasonic pulse, and f2 is generated due to an
excitation by a frame imaging vibration flK The vibration of the diaphragm 45 is a reduced
vibration generated at the terminal immediately after the end of the excitation to remain as a
damped vibration. In the vibration due to the reception echo captured by the transmitter /
receiver 4 after receiving, fl is 榎 J: J1. Vibration due to noise. (G) shows the amplifier input
terminal signal generated at the amplifier input terminal in the connection of the receiver 4 to
the amplification 65 of the receiver-dedicated transmitter 4, of which gz corresponds to the wave
form tx and g3 is the reception echo Corresponding to the vibration f3 due to g4I'i! It
corresponds to the vibration f4 due to the boundary sound. (The season shows a comparator
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output signal, of which h2 and h3 are obtained corresponding to the r2 reduction vibration f2 of
the previous day and the vibration f3 by the reception echo, respectively. (1) shows the distance
clock signal generated by the distance clock generator 10. (JJ represents the output signal j of
the gate circuit 9). Further, t1 to all tS in the same figure indicate each time, and the unit obstacle
detection operation, that is, the ultrasonic pulse is emitted for the time from tl to t8 to perform
the detection of an obstacle, and then the ultrasonic wave is detected again. It is time for
firewood to fire. The basic oscillator 1 performs the division operation of the carrier of the
emitted super sweat wave pulse and the period i,-, the pulse likelihood detector 2 performs the
dividing operation by the frequency divider 2a using the basic signal a as a clock input signal.
The output 1J is turned "0" only when all the outputs of Q, 10 'eQ and 13' of the vessel 2a are 1
". In addition, the output of the NAND 20) becomes t + OF + only when all the outputs of Q6 to
Q9 of the frequency divider 2a are-. Therefore, at time t1 at which the output of the NARD gate
2b becomes 0 ′ ′. 7) Rising 170 composed of HAND goo) 2e and NARD goo 2f is set, and the
gate circuit control signal θ at its output is time t! で′1”となる。 Next, during the period
from time t2 to time t3 when the outputs of HAND gate 2b and NAMD gate 2c both become Io ′
′, the output of NOR gate 2d, ie,!
5 (The phrase transmission / reception switching signal d is a town). On the other hand, the gate
circuit control signal θ which has become “1” at time t1. (9) In the period from time t1 to
time t3 in which the signal is NON, it is always 1n, and after time t3 in which the signal is "1", the
HAND gate 2e and MAND ge-1-2f The clip frog is activated. The signal a25K “1” at the Q9
output of the substation 2a is inverted by the inverter 2g to be 0 ′ ′ and becomes “10” to
reset 7 bits 170 of the NAND gate 2e and the HAND gate 2f. It becomes 1n. That is, during the
unit obstacle detection operation period from time t1 to time t8, the transmission / reception
disconnection signal gd is 1 "only during the period from time t2 to time ta. It becomes "1" only
during time ts. The duplexer 3 is switched by the duplexing signal d. First, the hearing receiver 4
from time t2 to time t3 when the transmission / reception switching signal d is "1" is connected
to the basic generator lVc. In the transmitter / receiver 4, the open basic signal a at 8 times t2 to
all times t3 is applied to the power supply 41, and the ceramic nut 44 is excited to cause aall
mechanical vibration. The vibration of the ceramic body vibrator 44 has a resonant structure
with the diaphragm 45 and the fixed X 46 (1 n 1 End Page: 3 so that the mechanical vibration of
the valve 弁 贅 贅 贅 贅 11 11 11 亨 at セ ラ ミ ッ ク t 11 The diaphragm 45 is caused to move
in a piston so that the vibration f in FIG. 5 (f)! Generate. The ultrasonic pulse generated from the
vibration flk of the diaphragm 45 is emitted in a predetermined direction, and 1 the emitted
ultrasonic pulse is reflected by the obstacle, a part of which becomes a reflection echo, and the
distance of the # object is It is received by the transmitter / receiver 4 at time t6 with a delay by
a corresponding time. This echo vibrates the diaphragm 45 to generate the vibration f3 of FIG. 5
(f '). The vibration tJJf3 of the diaphragm 45 becomes a mechanical input of the ceramic vibrator
44 and generates an electric signal according to the reception echo at t and others 41. On the
other hand, after time t 3, the transmission / reception device 4 is disconnected from the basic
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oscillator 1 and connected to the amplifier 5 because the fifth factor (the seasonal transmission /
reception switching signal d is 0 °). At this time, the shooting motion f1 of the diaphragm 45 for
transmission of the ultrasonic pulse continues as the damped vibration f2 of FIG. 5 (f) without
stopping the vibration after stopping the excitation at time t3. The tamper material 47 applied to
the diaphragm 45 is for reducing the duration of the damping shooting f2. The input signal g of
the amplifier 5 is
G2. Corresponding to the attenuating shooting f2. It includes gJ corresponding to 3 in the
received echo signal and g4 corresponding to vibration @ f4 generated due to severe
environmental noise generated in a car. The frequency of g4 due to the environmental noise is a
little older than the frequency of the basic signal a. In FIG. 5 (the input signal g of gJ from the
duplexer 3 is applied to the band pass filter 6 amplified by the amplifier 5 to a predetermined
level. The band pass filter has its center frequency equal to the frequency of the basic signal a by
the input terminal signal g of the amplifier 5. G2 in accordance with the damped vibration of the
diaphragm 45; Only the signal corresponding to gJ accompanying the reception echo is passed,
and the low frequency g4 due to the environmental noise which is the frequency outside the #
range is removed. The signal passing through the band pass filter 6 is detected by the detector 7
and then compared with a predetermined level by the comparator 8 and 0 ′ ′ when it is larger
than the predetermined level and 1 ′ when it becomes smaller. Fig. 5 (The average amount of
comparators Chi S is generated. That is, one time t3. Between time t4 and time t6 to time t7.
Since the comparator input reaches a predetermined bell in response to zj in response to the
vibration f2 due to the reception error and the vibration f2 due to reception. The comparator
output value gh is ON only during that time. This jJcs diagram CkL) is led to the comparator
output gate circuit 9, and the gate circuit 9 receives from time ts when the gate control signal θ
from the pulse generator 2 changes from 1 ′ ′ to The gate is opened until time t6 when the
output of the device becomes O ", and the distance clock signal 1 of a constant frequency from
the distance clock generator 10 is passed to output the gate circuit output j of FIG. 5 (j). That is,
the gate control signal e is at time t! The output of the inverter 9a of the gate circuit 9 is inverted
to 0 ". As a result, the 7 bit C1 bit composed of the NAND gate 9b and the WAND gate 9c is set.
The output of the NAND gate 9b is 1 ′ ′. This arbit flop is reset by the comparator output
becoming 0 ′ ′, but the wave form vibration f! Accordingly, the gate circuit control signal eiC
which is “1On from time t1 to time t1 迄 (13) 1” is set for h2 of the comparator output which
becomes “1Lon from time t3 to time t4 and the continuation is reset. There is nothing to do. し
たがって。 The arbit flop is reset at time t5 when the gate circuit control signal e becomes
negative and at time t5 after the output of the inverter 9a becomes l ′ ′ and the setting of the
seven rings 70 is canceled. It is time t6 when the comparator output signal becomes "0"
corresponding to the echo signal f3 from the obstacle received during time t7.
During the period from time tl to time t6, the 7th rig is set and the output of the WAND gate 9b
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is' ln ', and the output' of the inverter 9d connected to it is tlon. The NOR gate 9e receives the
output of the inverter 9d and the gate circuit control signal e, and while both inputs are 0 ′ ′,
that is, from the time ts when the gate circuit control signal θ force 2o becomes, the echo from
the obstacle The output is 1 ′ ′ during the time t6 until the signal is received. AND Go) 9f
FiNOR gate 9e out, open the gate while the power is 1 ′ ′, distance clock generator 1 o pass
distance crossy signal 1 and pass 1 time t5 to / lA) EndPage: 4 time tG The gate circuit output
signal j of FIG. 5 (j), which is a pulse train of the corresponding distance clock, is output. The gate
circuit output signal j is led to the distance counter 11 via the single signal line 100 as the output
of the sensor unit A, and the distance counter 11 counts the pulse train of the gate circuit output
signal + jj and the result is displayed on the display 12 Displayed by Here, since the time from
time t5 to time t6 changes in proportion to the distance between the vehicle and the obstacle, the
display of the distance between each other by 1 display 12 is performed, but in order to improve
the distance detection accuracy It is also a 0T capability to carry out the up / down correction of
the remaining margin distance corresponding to the constant time from time t2 to t11 in FIG.
FIG. 6 shows a second embodiment of the present invention. The difference from the first
embodiment is that the pulse generator 2 generates pulses independently without using the
output of the basic oscillator 1 as a clock input signal. , The distance clock generator 10 is
incorporated in the display section B, and the shift register 13 is used instead of the distance
counter 11. Gate circuit 9 ° distance clock generation in the second embodiment! The details of
alo, display 12 and shift register 3 are shown in FIG. A gate circuit 9 is composed of an inverter
9g and an OR gate 9h. The distance clock generator 1o has an oscillator 10n comprising
inverters 10a, 10b, a resistor] Oc,] Od, a capacitor 10e, and further, a counter Of which generates
an output obtained by dividing an input pulse to the clock input terminal 2n by 2n. IQg. 101,]
Om, inverter] Oh,] Oj resistance 10, and is constituted by capacitor 101. Inverter 0j, AND gate]
Om resistance Ink. The no Pf capacitor 101 forms a pulse differentiation circuit.
The shift register 3 is driven by the clock signal from the generator 10n applied to the clock
input terminal CP. The data input terminal DK is a signal sequentially output to all signal output
terminals Q1 through Q5 ◎ The display 12 latches the input signal to the latch input signals P1
to P5 by the input signal to the clock input terminal cp. The latch 12a outputs to the output
terminals Q1 to iQ1, and ((12 to 12 f and 12 light to 12 light emitting diodes). Next, its operation
will be described again with reference to FIG. From pulse generator 2! When the transmission /
reception switching signal d in FIG. 5 (d) and a signal obtained by inverting the comparator
output signal by the inverter 9 g are applied to the OR gate 9 h, OR gate 9h I / i FIG. It becomes.
That is, the wave form f of the transducer from the emission time t2 of the ultrasonic pulse to the
gate circuit output signal. It becomes 1 "only during the time t4 when 2 disappears in #J and
during the time between t6 and t7 when the echo from the obstacle is received, and it is" 0
"during the time of the ring. The counter 10f constitutes a monostable circuit together with the
AND gate] Og and the inverter 10h, and becomes the reset input terminal R-1ri′′O ′ ′ of the
color / 10f, and after the count operation is started, the clock input terminal op is Monostable
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operation until the input pulse is applied, the output of the output terminal Q5 becomes "1", the
output AE of the inverter 10h becomes "0" and the AND gate 10g closes and the count operation
(17) ends Do. After completion of the single operation, the output terminal Q5 of the counter 10f
is 1 "until the reset input terminal of the counter" [Of] "becomes" 1 ", and the 6-dot register
13tdIJt is output. . 1 to s (d is all 'θ'. Then, when the gate circuit output signal k becomes 1 "at 1
time t2, the counter I (If is reset, the output terminal Q5 becomes 0", and the reset of the shift
register 3 is released. Here, the counter 10f enters the single setting operation from the time t4
when the gate circuit output signal k becomes' () n and the reset is released, but after the nasty
reset from the time t6 to the time t7, the time t7 again It enters the year woman Bo 励. A signal
generator to be added to the clock input terminal OF of the shift register 13 via the reset klegic
(non-AND AND go) 101 of the shift register 13] Gate circuit output 18k applied to the distance
clock DK applied to the distance clock of the output of On Are incorporated into the shift register
13.
The signal taken into the shift register 13 is shifted in the shift register (18) EndPage: 513 by the
distance clock, and the signal Q! To Q5 sequentially. Then, with the emission of the ultrasonic
pulse, the gate circuit output Iki No. k, which becomes 01 "at time t2 全 all 1 刻, is taken into
shift register 13 and shifted so that output terminal Q5 becomes IIIn, innovator 10j The shift
register 13 is stopped by the shift register S in order that the output of the signal is 0 ′ ′ and
the AND gate 101 is closed. At the same time, the inverter 1 Oj, the resistor 10, the capacitor
101. The pulse dependent circuit composed of the AND gate 10m operates for a time
corresponding to the time constant by the resistor 10 and the capacitor 101, and the output of
the AND gate 10m becomes 1 ′ ′ 1 ′ ′ at one time, so the latch 12 & shifts The output of the
register 13 is incorporated and saved. Accordingly, among the light emitting diodes 12g to 12
connected to the output terminals of the latch 12a via the resistors 12b to 12f, the light emitting
diodes corresponding to the distance of the obstacle are dotted. For example, the light emitting
diode 12k is always at a point corresponding to the “1” output from the gate circuit output
signal from time t2 to time t4 accompanying the emission of the ultrasonic pulse, and time t6 to
by the echo receiving H The 6 light emitting diodes 12h are dotted corresponding to the t'1'g
output to the gate circuit output signal at time t7. That is, the light emitting diode 12k is dotted
corresponding to the distance 0, and the light emitting diode 12h is dotted corresponding to the
distance to the obstacle. Here, the difference in display distance between adjacent light emitting
diodes corresponds to a distance corresponding to one period of the distance clock. On the other
hand, at time t7, the counter 10f having entered the monostable operation completes the
monostable operation by the output terminals Q and 5 becoming 1 ′ ′ by time 8 to complete
the monostable operation and resets the 77 trancestor 13 to return to the initial state suddenly.
The above operation is then repeated by emitting an ultrasonic pulse every time the gate circuit
output signal k becomes "1" again. As described above, the device according to the present
invention comprises a basic oscillator that generates a carrier wave of a constant frequency, an
ultrasonic transducer that emits a ultrasonic wave upon receiving the carrier wave from the basic
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oscillator and receives an echo from Vi4. , A receiver that produces a pulse that indicates the
echo reception of the ultrasonic transducer. Switching means for alternately connecting the
ultrasonic transducer to the basic oscillator and the receiver at the time of ultrasonic emission
and echo reception respectively, the switching means and the receiver are connected to the
receiver and the time from echo emission to the remaining time after echo emission The
ultrasonic wave is provided with a gate circuit that generates a pulse corresponding to the time
obtained by subtracting a fixed time set in accordance with the above, and a display unit that
displays the distance to the object upon receiving the pulse from the gate circuit. There is an
excellent effect of being able to prevent a malfunction (bleaching phenomenon) due to a damped
vibration after launch.
In addition, since 1 display unit is installed in a single room and the sensor unit is installed in a
single outdoor room, and 8 display units and the sensor unit are connected by a part of signals,
the effect of simplifying mutual continuity can be obtained. is there. In addition, since there is a
swing plate distributed with a damper material for lowering the wave setting vibration of the
ultrasonic wave transmission and reception super wave wave launcher, the remaining margin
distance is set to be small. There is an effect that obstacle detection of distance is enabled.
Further, the switching means divides the carrier wave from the basic oscillator and generates a
pulse, and a duplexer which receives the pulse from the pulse generator and connects the
ultrasonic transducer to the basic oscillator or receiver. Since it has, it is effective in the ability to
utilize the signal from a basic oscillator effectively. Furthermore, since the pulse generator S
feeds a pulse having a width of a fixed time larger than the attenuation vibration duration after
the ultrasonic wave emission of the ultrasonic transducer, the remaining margin distance is set.
There is also an effect that you can simply set
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a ten-stroke diagram showing a first
embodiment of the present invention, and FIG. 1 is an electrical junction showing some details #f
of the ten-check diagram of FIG. Fig. 3 is a cross-sectional view of an axial portion of an
ultrasonic transducer used as a transducer, Fig. 3 is a signal waveform diagram to be made, and
Fig. 6 is a lock diagram showing a second embodiment of the present invention. FIG. 7 is an
electrical connection diagram showing a detailed configuration of a part of the ten-track line
factor of FIG. (2) Basic oscillator, (2) and (3) pulse generator and duplexer serving as switching
means, (4) ultrasonic transducer, (9) gate circuit, (A) sensor unit. A ′: receiver, B: display unit.
EndPage: 6 Figure 1 Figure 2 Sweat f: 1 M: 52112 928 (7) Figure 6 Figure 4 EndPage: 7
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