JPS5931468A - Obstacle display device - Google Patents

Abstract

PURPOSE:To unify coaxial cables between a processing part and a display part to a single cable and to transmit more information in a short time, by transmitting a range signal pulse in superposing with a different signal, and discriminating and separating the superposed signal at the display part. CONSTITUTION:Ultrasonic waves from transmitter-receivers 1A and 1B are inputted through the transmitting and receiving circuit 22 of the processing part 2 to a range signal generating circuit 23, which generates pulses with width corresponding to the time from the transmission to the reception of the ultrasonic waves. Then, abnormal signals 24a and 24b of the transmitter-receivers and a nighttime dimming signal 25b are superposed 26 upon the range signal and the composite signal is supplied to the display part 3. The display part 3 identifies the respective signals by a discriminating circuit 31 to display the range signal and abnormal signals by a display circuit 32, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an obstacle display device 11 that detects and displays the distance from a heavy vehicle to an obstacle. This is a dispute regarding an ultrasonic obstacle display device that detects obstacles.

This type of device has an ultrasonic transducer installed in the rear of the vehicle, transmits and receives ultrasonic waves via the transducer, calculates the distance to the obstacle in the processing section, and displays the information on the display. Display the distance.

Usually, only the display section is provided in a position in the vehicle where the driver can see it while driving, and the processing section is housed inside the trunk room or the like.

Incidentally, in addition to the normal distance fd signal, there are various signals transmitted from the processing section to the display section, such as an abnormality signal of a transducer and a dimming signal for dimming the display at night.

If these signals are sent using dedicated lines for each signal, the number of wires will increase, and the processing unit It is necessary to run a large number of wires between the trunk room etc. where the vehicle is stored and the vehicle compartment where the display section is provided, which requires a lot of wiring work.

The present invention was made for the purpose of solving the problems mentioned above.
The processing section is provided with a signal superimposition circuit, and the circuit superimposes the distance signal and other signals with different pressures and different pulse widths to emit the IM L, and displays the received h on the display section.
A signal discrimination circuit that separates and discriminates each signal from the recorded signal is provided, so that each signal can share the signal line between the processing section and the display section.
In order to obtain fJL, the wiring between the above-mentioned process A1 and the display section is reduced to IIl&i.

The present invention will now be explained by way of examples shown in the drawings.

In FIG. 1, IA and IB are ultrasonic transducers, a 2-digit processing section, and 3 a display section.

A transmitting/receiving circuit 2 that emits ultrasonic waves via the processing unit 2 L distribution receivers IA and IE and receives 1g of reflected waves.
2, and the time from ultrasonic transmission to reception (1
[A distance signal generation circuit 23 that generates a field pulse, an abnormality signal generation circuit 24 that generates a signal pulse by detecting a disconnection of the transducer IA, :LB or f sensitivity of 1 degrees below, and a display unit 3 at night. A dimming signal generating circuit 25 generates a dimming signal/pulse to dim the display of the display, and a signal condenser circuit tlvi26 superimposes the abnormal signal and dimming signal on the distance signal. Each circuit 22.23.24.2
It consists of a timing circuit 21 that generates 5.26 activation timing pulses.

The display unit 3 includes a signal discrimination circuit 31 that receives the sacrificed Shinsugi from the above-mentioned No. 1d [R tatami circuit: 66 and determines each No. 4.4 that has been +Ij) and a display circuit 32 including a display for displaying a signal and an abnormal signal.

Timing pulses 21a, 2lb, 21c, and 21d are sent from the timing circuit 21 to the transmitting/receiving circuit 22, and timing pulses 21e are sent to the distance signal generation circuit 23.
, 21 f, '21 g are the abnormality number 1 generation circuit 24
To 1 is timing r (Rus 21c, 21h, 21m, 2
1j is sent to the optical signal generation circuit 25 at 111 through timing and
The pulse 21k and the timing pulse 211 are output from the signal superimposition circuit 26-\, respectively.

Reception output from the transmission/reception 14 circuit 22 (No. 44 22a is the distance signal generation circuit 23 and abnormal signal generation IF!1 path 2
4 is input.

Output 23a1 of hqi release signal generation circuit 23 Output 24a, 24b of abnormal signal generation circuit 24S dimming signal quenching circuit 25
The outputs 25b are respectively input to the signal superimposing circuit 26. The IF both lamp lighting signal 25a is manually inputted to the dimming signal generating circuit 25.

No. 1m ER'& Output 26a of circuit 26 fi Show ff1
s 317) Input to the signal discrimination circuit 1M31, and the circuit 3
1 output 1'F'i No. 31a, 31b+'j display circuit 3
29 people are empowered.

2 to 71 show the timing circuit 21,
Transmission/reception 1rzl path b2, distance, 4 times signal illusion circuit 23, abnormal 1B signal generation circuit 24, dimming signal generation circuit 25, signal superimposition circuit '#j26 times: Rakunan, Figure 8 1 shows each of the above It is a time chart of fff number between circuits.

The configuration and operation of each circuit will be explained below based on the above figures.

In the timing 1M path 21 shown in FIG.
Ba? 3 Oscillation circuit that generates the KH2 reference clock,
2102 is a binary counter that counts the clock input to input terminal 0 and outputs 14 to 61ii child Q.
Output Pitt's binary number. Here, the number of vJ child Q (corresponds to each bit of M2 semi-defeat, 1 is LSBIItl
I, 14 or MSB side. Further, λ'11 terminal R is a reset terminal.

2103.2104.2105.2106.2107i
D flip-flop i tip, see is output terminal, S is output seso) ff1if child, R is output reset, 'l: +H child,! ? i! j To child C, electronic pulse human power, ~tj
+ The human input signal to D is as shown in 1. It is output to terminal Q as it rises by 2 heights.

The FNi signal of the 7i6 child Q is output to the terminal enabled.

Timing + (Russ (hereinafter referred to as pulset lbt) 2 l
b is the output signal of the terminal Q13 of the binary counter 2102, and 21a is a signal obtained by translating the output signal of the terminal Q13 by the inverter 2118, as shown in FIGS. 8(0) and 8(B), respectively.

? The signal 211 is the output signal of the flip 70 knob 2103, and the output signal is 120 as shown in No. 81ffl (A).
Each oos becomes an "l" level.

The pulse 21e is the output signal of the oB Age-2108, and the oH Age-210B has a flip 70 tube 2104.2.
The output signal of 105 is generated manually. 7 ribbon flop 2
It is set at the falling edge of the output signal 211 of the counter 2104, and reset by the output signal of the terminal Q6 of the counter 2102. In addition, the output of the flip-flop 21o5 (H is set by the pulse 21b's rising J2, and the counter 2
It is reset by the output No. 1d of the terminal Q6 of 1Q2. Therefore, the cis 21e becomes r anti-lunar as shown in Fig. 8 (J). This Gurus 21θ stays at "1" level for about 05m8.

The pulse 21c is the output signal of the AND game 2111, and the output signal of the pulse 21θ and the terminal Q1 of the counter 21o2 are input to the AND game 2111. 1 in 36.5 (
2-1-, the output of Mizuko Q1 appears. This is shown in FIG.
The OR signal of the output signals of the terminals of Figure a1 (E)
As shown in FIG. 2, this is a signal before the pulse 21e.

Persu 21g standing” - Riha! This occurs approximately 17.5 ms after the rising of the 21θ signal.

The pulse 2'Lf is the output signal of the terminal Q of the flip-flop 2106, and is approximately 3.5
After ms, it becomes the "1" level, and about 17.5 ms after the rise of the pulse 21e, that is, at the rise of the pulse 21g, the OJ level goes down. This is the 81st J (K
).

Terminal of pulse 21h counter 21o2. This is the output No. 1 of 7.

The pulse 21j is the output signal of the terminal Q of the 7-lip flop 2107, and r is approximately 50 ma after the rise of the pulse 21θ.
ll level.

For Pels 21, AND game) 2114 output, AND
Gate 2114 has the above! A pulse 21j and a pulse 21b are input. Therefore, in -ilsu21, when pkurus21'b is at the "1" level, -ilsu21
It reaches the "1" level about 50 ms after θ rises.

This is shown in FIG. 8(P).

・1 pulse 21 is the output signal of the terminal Q9 of the counter 2102.

The transmission/reception shown in FIG. 3 (in the W circuit 22, 2201.2
202.2203 is an analog switch, terminal OK "1"
When the signal from LIT is input, conduction occurs between lit, )S and D. Therefore, the pulse 21a selects the transmission/reception wave 01A, and the pulse 21b selects the transmission/reception wave dlB. Selected transmit/receive wave? 'trIA, 36 for 1s
．． At 5 KHz, pulses 210 are sent out to generate ultrasound waves.

When the transmission of the pulse 210 is completed, the pulse 21d outputs the reception signal 22a from the selected transducer LA or IB by selecting the analog switch 22037z.

In the distance fiber signal generation circuit 23 shown in FIG.
It is a flip 70 tube. The received signal 22a is sent to the amplifier 23
The output signal 23b of the comparator 2302 becomes the "0" level when the signal level exceeds a predetermined signal level. This signal 231) is shown in FIG. 8 (It'). Distance signal 23
a is the output signal of the terminal Q of the flip 70 tube 2306,
It becomes a "1" level due to the pulse 21θ, and becomes a "0" level due to the signal 23b when the ultrasonic wave vk is received. Here, AND gate 2305Kn +< pulse 21f is input manually, and only when this pulse 21f is at the "1" level is received = +
4 22a is accepted to prevent false detection caused by the lingering V of the C1 ultrasound tail 1z. Also, the transmitting and receiving wave gi
Due to the disconnection of iLA and IB, the received signal 22a is not input to the platform (C is the distance signal 23a due to the 19th pulse 21g).
t ``OJ level.Signal 23a to 81st station (L)
Shown below.

In the abnormality number 1d generation circuit 24 shown in FIG.
01 is Dan 1υ vessel, 2402.2403 are lfr respectively
Comparator for line detection and sensitivity reduction detection, 2404.
2405.2406.24o7.2408.2409
It is a 70 piece D flip.

Disconnection and reduced sensitivity of the transducers IA and IB are detected by receiving the aftereffects after transmitting the ultrasonic waves. The received signal 22a is amplified by an amplifier 24o1 and then sent to comparators 2402 and 2403.
and if normal, both converters 2402X
The output signals 24c and 24d of the converter 2403 are at the "1" level, and only the output signal 24a of the compiler 24o2 is at the "11" level in case 6 of decreased sensitivity. ” level. The signals 24c and 24d are shown in FIGS. 8(G) and (1()), respectively.

7 rip 70 Tub 2404, 2407 It is reset by the pulse 21c, and the terminal becomes "1" level. When the transducer IA and IBKI are present, the signal 24c or 24d is not input to the terminal 0 of the 7-lip 70 tube 2404.24o7, so the "1" level output between the terminals is -
7 lip prop 2405 at pulse 21h timing
．． Flip-flop 2406.2409 via 240B
Then, the abnormality signals 24a and 24b are outputted from the terminal Q thereof. The signals 24a and 24b are shown in FIG. 8 (M
) and (N). The signal 24a17i is reset by the pulse 21j, and the signal g' 24b is reset by the pulse 21m.

In the dimming signal 1 & raw circuit 25 in Fig. 6, 2501 is a switching circuit using a transistor, and the double lamp lighting signal 25a is 25
Only when 03 is open, it is output as dimming 1g No. 25b.

In the signal superimposing circuit 26 of FIG. 7, 2609 is a transistor, and a constant voltage 24 is connected to its collector. 26o5.2606.2607.260B is a switching circuit, circuit 26o5.2606.26 '07
is connected to the base of transistor 2609, and circuit 26
08S1 is connected to the emitter. The switching circuits 2606 and 2607 have a constant value of 19V and 12V, respectively. IE diodes 2606a and 2607a are incorporated, and the emitter voltage of the transistor 9609 becomes 12V when the switching circuits 2605 and 2608 are activated.

The output signal 26a of the signal superimposing circuit 26 is the output of the emitter of the transistor 2609. I'm so excited,
Gurus 21/ indicates the start of transmission and reception of transducers LA and IB.
is input and the switching circuits 2605 and 2608 are activated, the signal 26a becomes 4 pressure Ov, and the distance signal 23
When a is input and the switching circuit 2606 is activated, the voltage of the signal 26a becomes 19V. Further, when the switching circuit 2607 is activated by inputting the dimming signal 25b or the sensitivity reduction signal 24b, the voltage of the signal 261L becomes 12V. The switching circuit 2606 due to the disconnection signal 24a,
2607 stops operating, and signal 26& becomes 24V.

This signal 26a is shown in FIG. 8 (Q,). As shown in the figure, the signal 26a includes the distance signal 23a and the abnormal signal 24aS24b.
and the dimming signal 25b, ie, the pulse 21k, are superimposed at different voltages and with different pulses.

Figure 9 shows the signal discrimination circuit 3]. and a circuit diagram of the display circuit 32. In the figure, 3101 is a power supply circuit, 3102, 31
03, 3104 is Con? Grator, 3 1 o 5id
Microcomputer for signal processing (hereinafter referred to as microcomputer), 3201 is a 2KHz oscillation circuit, 3202, 3
203 is a first display driver, and 3204 and 3205 are light emitting diode displays.

The cancellation signal 2 6 , a generated by the processing unit 2 is input to the power supply circuit 3101 of the signal discrimination circuit 31 and generates a constant voltage of 5V, which is divided by resistors 3106 and 3107 to produce a maximum load of 4. It is changed to the signal 26b of (2). signal 26
b is compared with reference Ichikawa signals 3108a, 3108b, and 3108c by comparator 3102, 3103, and 3104, respectively, and the output of each comparator is
05 human capo) KO, Kl, K2 are man-powered.

Signal 26b and reference voltage signals 3108a, 3108b
, 3108c's Ichikawa level is shown in map 101. The outputs of each of the above comparators are signals 3108a, 3108b, 3
If 108c's 4 pressure is better than FG No. 26b's Ichikawa,
1” level. Therefore, depending on the human power level of the microcomputer 3105 and KO, the distance signal 26b and the disconnection signal 26b! The human power level of KL (the presence or absence of the r'q+2 light (A No. 26b3 and the sensitivity reduction signal 26b, the human power level)) The human power level of K2 determines the ultrasound transmission/reception cycle start signal 26b, Determine whether or not there is.

The distances to the fault 'J//J detected by the transducers LA and IB are compared in the microcomputer 3105, and the shorter distance is determined by the output signal 31a of the microcomputer 3105 to the driver 32.
02 to the display 3204, and the corresponding light emitting diode lights up. At this time, the transducer IA showed a short distance.

1B is output to the display i 3205K via the driver 3203 according to the output signal 31b, and the corresponding light emitting diode lights up.

If there is a disconnection signal, the signal 31a will cause the display 3 to
All the light emitting diodes 204 are turned on, and the light emitting diodes corresponding to the broken transducer on the display 3205 are turned on in response to the signal 31b.

, in the case that there is a low-turn signal, the light-emitting diode corresponding to the transducer that has dropped by 1!8 degrees on the display 3205 is blinked by the fg signal 31b.

If there is a dimming signal 1A, the output 1B 31c opens the AND game) 3206, and the oscillation circuit 3201 connects the terminals D S I K 12 of the driver 3202 and 3203.
Apply KHz pulse to display 3204.320
The light is dimmed by thinning out the single charge time to the light emitting diode No. 5.

As described below, the obstacle display device of the present invention superimposes other signals on the distance signal pulse at different 1 d pressures and different health widths in the signal superimposition channel of the processing section, and sends the signal to the display section. Since the discrimination circuit receives the above-mentioned tatami signal and separates and discriminates it into the original signal, wide transmission between the processing section and the display section is possible with a single coaxial cable, and it can be used in the trunk room where the processing section is installed. Installation of 4γ and display Cπ;? ? ``1''
11 gland wiring modifications can be reduced, and the wiring man-hours (1
+i, 12, and moreover, it is possible to send a lot of information in cicada time.

[Brief explanation of the drawing]

Figure 1 is a general project diagram of the present invention, Figure 2 is a diagram, and Figure 7 is a
The diagrams each show a timing circuit, transmission and reception! :! 1st circuit, distance signal generation circuit, abnormal signal generation circuit, dimming risk occurrence 1st period, circuit diagram of signal superimposition circuit, Figures 1 to 8 are time charts of signals between the above external circuits, No. 91i1 is signal discrimination A circuit diagram of the circuit and the display circuit, and FIG. 10 is a diagram showing the superimposed signal waveform after the popular pressure level conversion. LA, IB... Ultrasonic transducer 2z...
・Transmission/reception circuit 23...Distance signal generation circuit 24...Abnormal signal generation circuit (signal generation circuit) 2
5...Dimming signal generation amount A (signal generation circuit) 26...F signal superimposing circuit 31...Signal 'i→I separate circuit 32... ...display circuit

Claims (2)

[Claims] (1) an ultrasonic transducer; a transceiver circuit that causes the transducer to emit ultrasonic waves and receives reflected waves;
A distance signal generation circuit that generates a distance signal pulse whose width is 1j greater than the time from ultrasonic transmission to reception (g), and a signal generation circuit that generates a distance signal pulse that is superimposed on the distance signal pulse. A signal superimposition circuit that multiplies the other signal pulses with different voltages and different pulse widths and transmits them, and receives the fg signal from the signal superimposition circuit and distinguishes each superimposed signal. Obstacle display device ff comprising a signal discriminator N path and a display circuit that displays each discriminated signal. (2) The obstacle display device +i according to claim 1, wherein the other signals are an abnormality signal of the transducer and a dimming signal of the display.