JPS5848960B2 - Pulse Radar Dynamics Backing Meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power-saving parking meter with a built-in power supply battery in a street parking meter using a pulse radar parking detection method, and is intended to reduce installation costs.

A conventional on-street parking meter using a pulse radar parking detection system has a power supply circuit, an ultrasonic parking detector, or an optical parking detector shown in blocks with virtual lines, as shown in the block diagram of Figure 1. (Both detectors may be used together)
, a parking time measurement circuit, and display circuits for displaying unpaid fees, parking time, parking violations, etc.

The power supply circuit has an output a that supplies voltage to the parking detector and an output b that supplies voltage to the parking time measuring circuit.

Furthermore, to illustrate the internal configuration of a parking detector using an ultrasonic type as an example, each block within the dotted line in Figure 2 includes a time control circuit, a frequency oscillator, a transmitter, a receiver, a receiving amplifier, and an integrating circuit. Consists of etc.

Note that when an optical parking detector is used instead of the ultrasonic parking detector, the time control circuit shown in the figure is not necessary.

An overview of the operation of the circuit in Fig. 2 will be explained in conjunction with the chart in Fig. 3. When the output a of the power supply circuit applies pressure to the parking detector with a voltage waveform as shown in the chart, the time control circuit operates as shown in the chart. The ultrasonic generator and the reception amplifier are controlled by opening a time gate at which the reflected wave from the car can be received, such as at time t.

The ultrasonic generator generates sampling pulses as shown in the chart according to the input from the time control circuit, and sends them from the transmitter to the parking area to which it belongs.

When a car is parked in the parking area, the reflected wave from the car such as Chartoni is received by the reception amplifier via the wave receiver, and the amplified reception voltage is integrated by the integrating circuit as shown in Chart. From there, the set pulse shown in the chart is applied to the parking time measurement circuit to start measuring the parking time, and when the reception of the reflected waves of a certain period is cut off, the time measurement is reset and the parking time is measured. .

The output of the parking time measurement circuit controls the respective display circuits for unpaid tolls, parking time violations, and elapsed parking time. This is done when the payment is not made, and the parking time violation display is made when the parking time exceeds the specified time (usually about 1 hour).

It goes without saying that the parking time display displays the elapsed parking time from the time the car enters the parking area.

An overview of the configuration and operation of the conventional on-street parking meter using the pulse radar parking detection method has been described above.

However, this type of parking meter currently in practical use is supplied with power for its operation by a power source installed on a utility pole or the like, or by parallel power supply from an adjacent parking meter.

Therefore, these power supply lines are usually buried underground, which increases installation costs such as digging up the paved road surface and repairing the pavement when installing or changing parking meters. There was a problem.

Furthermore, the period of the sampling pulse shown in Fig. 3 is conventionally 1.
The response speed of parking meter control does not necessarily need to be fast because the time limit for paying the parking fee is within 5 minutes after parking, so there is plenty of time.

Furthermore, in the past, the parking time display mechanism used a synchronous motor, etc., which was constantly energized, and the display of unpaid fees, parking violations, etc. were displayed separately using incandescent lamps, resulting in a structure that consumed a considerable amount of electricity. was.

In view of the above points, the present invention reduces the number of times power is supplied by setting the detection timing of the parking detector to about once every few seconds and increasing the repetition period of sampling pulse generation, and also provides a pulse drive mechanism for the display unit. The system is designed to save power by using low-power circuit elements in circuits that require a constant supply of power, and has a single power source structure with a built-in battery.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a power supply circuit including a timing generator TG1, a power switch PSW, etc., and timing generators TG2 and TG3.
The parking detector consists of a time control circuit such as, an oscillator that sends an output to the transmitter, an amplifier for the received signal input from the receiver, a rectifier, a level comparator including an integrating circuit, etc., and an AND gate AND1,! J set set flip flop FF,
FIG. 2 is a circuit block diagram in which an output logic circuit LGC consisting of a shift register SR, an AND gate AND2, a NOR gate NOR, etc. is provided.

In the same figure, the configuration of the power supply circuit and the driving vehicle detector itself is the same as the conventional one, but the conventional sampling period is 10.
However, in the present invention, the period t1 of the detection timing shown in chart a of FIG. Since it is several 10ms at most,
The power supply input to the parking detector was a pulse input with a pulse width t2 (for example, t2 = about 40 ms) shown in chart b of the figure.

Then, the timing generator TG2 sets the receivable time width t3 shown in chart c, and the timing generator TG3 sets the transmission pumping pulse width t4 shown in chart d.

The sampling pulse sent out with a pulse width of time t4 is reflected by the vehicle body and the received signal contains noise or diffusely reflected waves and has a waveform as shown in chart e. However, the receivable time width after sending out the sampling pulse, The signal waveform received at time t5 becomes the parking detector output as a valid detection signal.

If the sampling period of such a parking detector is t1, and the power supply time required from transmission to reception of reflected waves is t2, the power to be supplied can be reduced to t2/t1.

The output logic circuit LGC has a sampling period t1 as described above.
This circuit was provided to compensate for the reliability of reducing the detection frequency by making the length of the detection period several seconds.

That is, the AND gate AND1 of the same circuit closes the gate during time t4 of chart d in FIG. As shown in chart f, the logic value tl I I1 is set, and the timing generator TG2
It is reset to the logic value "0" by the rising edge output.

The output of the timing generator TG2 is also input to the shift register SR as a shift clock and is input to the flip-flop F.
Shift the input from F to register SR and transfer it to register SR.
If it outputs the logical value el I II more than nl times in a row, the output of the AND gate AND2 becomes the logical value "1" and becomes the inventory detection output, and if it outputs the logical value "0"' more than n times, it becomes a no game. − Is the output of NOH a logical value +?
111 is used as a vehicle absence detection output, which prevents false detection due to random reflected signals and increases reliability.

Although the output logic circuit LGC requires constant power supply, power is saved by using, for example, a C-MOS (complementary metal oxide semiconductor device) for the circuit elements of this circuit.

FIG. 6 is a block diagram of a parking time display circuit, in which a pulse motor PM is used to drive the parking time display pointer CN step by step.
The structure is such that power is supplied to the pulse motor PM only when the pointer moves.

That is, when the parking time measuring circuit TC receives the inventory detection output signal of the output logic circuit LGC shown in FIG.
Pulse motor PM by outputting step signal s1 every minute
is driven to advance the pointer CN.

When the time measurement progresses and reaches the specified parking time, a signal s2 is output, and when the measurement time reaches the full scale of the hour and minute scale, a clock stop signal s3 is output to stop the pulse motor drive, and the pointer CN is set to the full scale. held in position.

When the vehicle leaves the parking area and the absent vehicle signal is input, the time measurement circuit TC generates a reset signal s4, reverses the pulse motor PM, returns the pointer CN to the O point on the scale, and detects the point CNOO of the pointer. The signal is time measurement circuit TC
The reverse rotation of the pulse motor PM is stopped via the .

In this way, if the parking time is measured and displayed every A minutes and the time required for the display pointer to advance is set to B minutes, power consumption of B/A can be saved.

However, since the parking time measuring circuit TC has a timekeeping function, it has a built-in memory circuit.

Therefore, since this circuit requires a constant supply of power, a circuit element with very low power consumption, such as the previously mentioned C-no S, is used to realize power saving.

Figures 7 and 8 show an example of improving the unpaid toll and parking violation display section. Conventionally, the unpaid toll display and the parking violation display were separate, but in this embodiment, the unpaid toll and parking violation displays are the same. shall be taken as a thing.

In other words, upon reception of the stock signal, the vehicle displays a red display to indicate unpaid tolls, and when the toll is paid, the display disappears.Furthermore, when the vehicle is parked beyond the specified parking time, the vehicle displays red again to display a parking violation warning. This is an example of a case.

Figure 7 shows the display control circuit shown in A of the figure.
When the stock signal is input to OR1, the one-shot multivibrator OS1 is activated via the inverter IVI.
Activate transistor TRI for a short time to open the red display circuit.

Next, when a charge input signal is input to the NOR2 shown in FIG.

When the parking time elapses and the specified parking time is reached, a signal s2 is output from the parking time measurement circuit TC shown in FIG. 6 to the Noah gate NOR.
1 to open the red display circuit again and display the parking violation warning, and when the vehicle leaves the parking area, the absent vehicle signal will be displayed. Input to NOR 2 and open the white display circuit to change the display to white. return.

Figure 8 is a schematic diagram of the display configuration when a remanence-holding spherical rotor whose spherical surface is color-coded into red and white is used in the display controlled by the circuit in Figure 7, and A is a front view. , B shows a side view.

In each of the figures A and B, 1 is a rotating spherical body with one half of the sphere divided into two colors, red and the other half white, and a built-in permanent magnet 2, 3 is a spherical body with 10 rotating shafts, 4 is a bearing base, 5 is a coil, and one end of the coil terminal is connected to the collector circuit of the transistor TRI shown in Fig. 7.
The center terminal serves as a common terminal (power supply), and the other end is connected to the collector circuit of the transistor TR2.

6 is the iron core of the coil 5.

Due to the relationship between the direction of the current flowing through the coil 5 and the polarity of the permanent magnet 2 by the control circuit shown in FIG. 7, the spherical body 1 rotates half a turn in the direction of the arrow shown in FIG. After that, the position is maintained depending on the relationship between the residual magnetism of the iron core 6 and the polarity of the permanent magnet 2, and red or white is displayed.

In this way, power saving can be achieved by supplying power to drive the display only when changing the display.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an overview of the configuration of an on-road parking meter using the conventional pulse radar parking detection method, Fig. 2 is a block diagram of the configuration of the ultrasonic parking meter shown above, and Fig. 3 is an operation chart of the above parking meter. Fig. 4 is a block diagram of a parking detection circuit equipped with an output logic circuit showing an embodiment of the power-saving parking meter of the present invention, Fig. 5 is an operation chart of the same circuit, and Fig. 6 is an implementation of the parking time display control circuit. A block diagram showing an example, FIG. 7 is a control circuit diagram of an unpaid toll display and a parking violation display, and FIG. 8 is an example diagram of the same display. PM: Pulse mode, TC: Parking time measurement circuit.

Claims (1)

[Claims] 1. In on-street parking meters that use pulse radar parking detection using ultrasonic waves or light, the sampling pulse generation cycle for parking detection is set in seconds, and the parking meter is set such that power is supplied only during the time required for signal transmission and reception for each set cycle. The structure is such that power is supplied intermittently to the detector, and each display mechanism for parking time, unpaid parking fee, and parking violation is driven in pulses only when each display changes, and other circuits that require constant power are equipped with low power consumption. A pulse radar parking detection on-road parking meter characterized by having a built-in battery power source by using a circuit element or the like.