JP3064028B2 - Parking detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention periodically transmits an ultrasonic pulse toward each parking space in a parking lot, detects the presence or absence of a parked vehicle based on the presence or absence of a reflected wave, and transmits a signal to a control room. The present invention relates to a parking detector.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a configuration using a parking detector based on ultrasonic pulses as an example. Transmission signal creation circuit 1
An ultrasonic transducer 2 for both transmission and reception, an amplification detection circuit 3 for amplifying and detecting a received signal from the ultrasonic transducer 2, a waveform shaping circuit 4 for shaping the output of the amplification detection circuit 3, and a gate signal generation A gate circuit 6 for opening a gate for a predetermined time by a gate signal from the circuit 5, a detection output delay circuit 7 for on-delaying and off-delaying the signal output from the gate circuit 6, and an output of the detection output delay circuit 7 A parking detector is constituted by an LED display 8 for displaying the presence / absence (presence / absence) and a relay output means 9 for transmitting a signal to a control room via a transmission line at the output of the detection output delay circuit 7.

[0003] Each of the circuits 1 to 6 constitutes an ultrasonic pulse reflection type detection means, the detection output delay circuit 7 constitutes an erroneous detection prevention means, and the LED display 8 constitutes a display means. , And the relay output means 9 constitute a detection output means. In this device, an ultrasonic pulse is intermittently emitted at a period of, for example, 200 msec, and a reflected wave from an object is replaced with a received signal by an amplification detection circuit 3 and a waveform shaping circuit 4. And in the gate circuit 6,
From the transmission signal creation circuit 1 through the gate signal creation circuit 5,
When input to the gate circuit, the gate circuit 6 detects the detection output (FIG. 6 (a)) and activates the on-delay and the off-delay (FIG. 6 (c)) by the detection output delay circuit 7, so that the LED is turned on.
The display 8 and the relay output means 9 are driven simultaneously (FIG.
(B) (c)).

In general, this kind of parking detector sets an on-delay for several seconds to several tens of seconds in order to discriminate the presence or absence of a pedestrian from a pedestrian. The off-delay time is often set to several seconds to several tens of seconds for stable operation when the vehicle temporarily enters and exits from within. In addition, the parking detector relies on a display such as an LED in order to determine whether the detection area adjustment, the angle adjustment, and the distance setting at the time of construction are good or bad.

[0005]

However, the response time is slow due to the on-delay and off-delay times.
The construction time is long, and even a few seconds are felt long. In a parking lot with a scale of 100 or more, there is a disadvantage that the construction adjustment time is disadvantageous. By the way, the detection output with the on-delay and off-delay is displayed centrally in the control room or control room in the transmission system, but in fact, the on / off delay function aimed at vehicle safety detection is performed in the control room. The delay period creates a possibility of trouble.

For example, even though a certain car is parked in a certain parking space, a signal is transmitted to the control room after the on-delay, so that the control room can move another car in a short time. There is a possibility of giving guidance instructions. Conversely,
Despite the fact that the car has left the parking space, it is not possible to know quickly and there is a problem that hinders efficient operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to improve the construction adjustment time due to the presence of an on-delay time and an off-delay time, and to reduce a delay in signal transmission to a control room. A parking detector is provided.

[0008]

According to the present invention, the display means displays the presence / absence status of the vehicle at the same time as the presence / absence of the change of the presence / absence of the vehicle, and outputs the detection output to the transmission system. A control means for outputting a signal passed through the erroneous detection prevention means is provided.

[0009]

According to the control means, the display means displays the presence / absence state of the vehicle at the same time as the presence / absence of the change of the presence / absence of the vehicle, and the detection output for outputting to the transmission system is incorrect. A signal that has passed through the detection prevention means is output.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment. As is clear from FIG. 1, the basic configuration of the present invention is the same as the block of FIG. 5, but the input method to the LED display 8 is different. That is, the output of the gate circuit 6 is directly input to the LED display 8.

For example, 200
The ultrasonic oscillator 2 intermittently outputs ultrasonic pulses at a cycle of msec.
While being emitted, the reflected wave from the object is replaced by a received signal by the amplification detection circuit 3 and the waveform shaping circuit 4. Then, in the gate circuit 6, when a reception signal is input within the period of the gate signal input to the gate circuit 6 from the transmission signal generation circuit 1 through the gate signal generation circuit 5, the output is output from the gate circuit 6. The signal is subjected to ON / OFF delay processing by the detection output delay circuit 7 to drive the relay 9.

The LED display 8 is directly driven by the output of the gate circuit 6 without passing through the detection output delay circuit 7. Accordingly, the LED display 8 is displayed simultaneously with the vehicle detection output as shown in FIG. 2 (b), and the relay output means 9 sets the on-delay time and off-delay time as shown in FIG. 2 (c). Output. The control means has a connection configuration in which an output of the gate circuit 6 is directly input to the LED display 8.

FIG. 3 shows a second embodiment to which an oscillation circuit (f = about several Hz) 10 is added. The transmission signal generating circuit 1 intermittently emits an ultrasonic pulse from the ultrasonic transducer 2 at a period of, for example, 200 msec, and the reflected wave from the object is received by the amplification detection circuit 3 and the waveform shaping circuit 4 to receive the reception signal. Is replaced by And the gate circuit 6
When the reception signal is input through the transmission signal generation circuit 5 and within the period of the gate signal input to the gate circuit 6, the gate circuit 6 is detected by the detection output delay circuit 7.
A signal is input to the oscillation circuit 10 at the same time as the on / off delay is activated.

The oscillating circuit 10 emits a signal of about several Hz, and its signal is a signal as shown in FIG. 4C accompanied by an on-delay and an off-delay by an oscillation waveform, and this signal is output to the relay output means 9. Is done. When the delay by the detection output delay circuit 7 ends, the final state of the presence or absence of the vehicle is output to the relay output means 9. LED display 8
Is displayed in real time, as shown in FIG. 4B, without being influenced by the ON / OFF delay by the output of the gate circuit 6.

[0015]

As described above, according to the present invention, the display means displays the presence / absence status of the vehicle at the same time as the presence / absence of the change of the presence / absence of the vehicle, and outputs the detection output to the transmission system. Since control means for outputting a signal via the false detection prevention means is provided, the control means causes the display means to display the presence / absence state of the vehicle at the same time as the presence / absence change of the vehicle, In addition, the detection output for outputting to the transmission system can output a signal through the erroneous detection prevention means. Therefore, an output display (relay display, LED display) by providing an on / off delay time is provided. The display means provided in the parking detector corresponding to the parking space at the site responds in real time to the presence or absence of a car so that the delay of ()) does not affect the construction adjustment time, and outputs the data to the transmission system. Are on and off By that is output by providing a laser, a distance setting during construction, the area setting, the angle setting is done quickly, also provide an advantage that even adjusting in step is shortened, also,
In order to avoid delays in catching information in the control room and trouble in entering the garage, it is possible to display the entry and exit of the parking space of the vehicle, and to reduce the wasteful time caused by the on / off delay. It has the effect of improvement.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an operation waveform diagram of FIG.

FIG. 3 is a block diagram of a second embodiment.

FIG. 4 is an operation waveform diagram of FIG.

FIG. 5 is a block diagram of a conventional example.

6 is an operation waveform diagram of FIG.

[Explanation of symbols]

 6 Gate circuit 7 Detection output delay circuit 8 LED display 9 Relay output means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G08G 1/14

Claims (1)

(57) [Claims] 1. An ultrasonic pulse reflection type detection means for detecting the presence or absence of a vehicle for each cell in a parking lot, and a signal passing from the ultrasonic pulse reflection type detection means for merely passing a person or switching a vehicle. Erroneous detection prevention means equipped with an on-delay and an off-delay capable of canceling erroneous detection due to noise, display means for monitoring the presence or absence of a vehicle by a signal from an ultrasonic pulse reflection type detection means, In a parking detector having detection output means for transmitting a relay contact output or the like to a transmission line to a control room, the display means displays the presence / absence status of the vehicle at the same time as the presence / absence change of the vehicle. And a control unit for outputting a detection output for outputting to the transmission system via a false detection prevention unit.