JPS6117085A - Sensing method of vehicle for vehicle gate unit - Google Patents

Abstract

PURPOSE:To enable the sensing of the presence of a vehicle not affected by any external factor such as temperature, by comparing the oscillation frequency during the passage of the vehicle with a reference obtained by adding a specified number to the oscillation frequency before access of the vehicle to reduce the number of required oscillators of a vehicle detection means to one. CONSTITUTION:The number of data outputted from a data latch section 10 is compared with the reference outputted from a total adder 16 and when it is larger than the reference, H is outputted while when it is smaller than the reference, L is outputted. The outputting of H from a comparator 17 means the sensing of a vehicle and a counter 11 is reset while the strobe of a latch strobe control 1 is forbidden to hold the reference. As the vehicle passes, the number of data at the data latch section 10 decreases and the output of the comparator 17 goes to L. The counter 11 restarts counting and the latch strobe control 12 outputs a signal at a specified time interval to rewrite the number of data at an auxiliary latch section 13 and a main latch section 14. Thus, the presence of a vehicle can be sensed in noway affect by any external factor such as temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle sensing method in a vehicle gate device.
More specifically, this is a case where only one detecting means whose oscillation frequency changes in an increasing direction when the vehicle is in a close position is disposed on the vehicle get.

The present invention also relates to a vehicle sensing method that can accurately sense the presence or absence of a vehicle without being influenced by external factors such as temperature.

Conventionally, LC oscillators were provided as the detection means at two locations, one at the vehicle gate and another location, to offset the effects of external factors such as temperature.

However, the conventional method is not only expensive because it requires two detection means, but also requires adjustment so that the two detection means have the same oscillation frequency under the same conditions. Furthermore, since the two detection means are placed in different cases, the two detection means do not necessarily change in the same way due to external factors, such as when only one of the detection means is exposed to direct sunlight. There was a problem in that the presence or absence of a vehicle was not detected accurately.

The present invention has been made in view of the above-mentioned problems, focusing on the fact that changes in frequency due to external factors such as temperature of the detection means change more slowly over time than changes in frequency due to passing vehicles. The object of the present invention is to provide a vehicle sensing method in a vehicle gate device that can accurately sense the presence or absence of a vehicle without being affected by external factors such as temperature even if only - number of detection means are provided. The feature is that a detection means whose oscillation frequency changes in the direction of increasing when the vehicle is in a nearby position is installed at the vehicle gate, and the oscillation frequency of the detection means is counted. A reference number is obtained by adding a predetermined number greater than the increase in the oscillation frequency due to external factors such as temperature and smaller than the increase in the oscillation frequency when a vehicle approaches to the count number for a certain period of time, and the reference number and the reference number are The presence or absence of a vehicle is detected by comparing the count number at the same time with the predetermined time after the count is obtained.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

1 is an LC oscillator, the coil la of which is buried underground in the vehicle gate.

A frequency divider 2 divides the frequency of the LC oscillator 1 at a ratio set by a frequency division ratio setting switch 2a. This frequency-divided sensor oscillation output has a waveform shown in FIG.

This sensor oscillation output is shaped by a waveform shaper 5, passed through a counter gate 6, and is inputted to the main power supply.

On the other hand, 8 is an oscillator for reference time, which oscillates at a higher frequency than the frequency of the sensor oscillation output and at a stable frequency, and is counted by a counter 9 to set the reference time.

As shown in FIG. 2(b), the counter gate 6 is closed by the output signal of the counter 9 after a certain period of time set by the counter 9 has elapsed. At the same time as the counter gate 6 closes, the data latch strobe signal shown in FIG.

At the same time as the data latch strobe signal falls, the
The main power unrecent signal shown at dl is output from the counter 9, the count value of the main power lantern is reset, and the first fall of the sensor oscillation output after the fall of the main counter reset signal serves as a trigger, and the counter gate 6 is activated again. The main counter starts counting the sensor oscillation output. Note that the certain time t is about 40 m5ec.

Next, the number of data sequentially rewritten in the data latch section 10 every predetermined period of time is determined by the number of data outputted from the lunch strobe control 12 based on the output signal of the second counter 11 that counts the output of the counter 9. The auxiliary latch signal is held in the auxiliary latch section 13 in accordance with the timing of the auxiliary latch strobe signal with a period of 2T shown in FIG.

Data launch unit lO held in this auxiliary launch unit 13
The number of data is held in the main launch section 14 by the reference launch strobe signal outputted from the latch strobe control 12 after T time after the auxiliary launch strobe signal, as shown in FIG. 3(b). Note that the time T is 3 to 4 seconds.
It is ec.

The data latch unit 10 held in the main launch unit 14
The number set by the sensitivity setting switch 15 is added to the data number by the full adder 16, and the reference number is output from the full adder 16. The number set by the sensitivity setting switch 15 is larger than the number calculated by dividing the increase in the oscillation frequency of the LC oscillator 1 due to external factors such as temperature by the frequency divider 2 and counting over the certain time t, The number must be smaller than the number obtained by similarly counting the increase in the oscillation frequency when the vehicle passes over a certain period of time t.

17 is a comparator, which compares the reference number output from the full adder 16 and the data number output from the data latch section 1o, and as shown in FIG. When the number is larger, the output is H, and when it is smaller, the output is L. When the output of the comparator 17 is H, it means that a vehicle is detected, and the counter 11 is reset, and the launch strobe control 12 is also output. The strobe is prohibited and the reference number is held. When a vehicle passes and the data number in the data launch section 10 becomes smaller than the held reference number and the output of the comparator 17 becomes L, the counter 11 Counting is started again, and the latch strobe control 12 outputs a signal every predetermined time to sequentially rewrite the data numbers in the auxiliary latch section 13 and the main latch section 14.

In the above-described embodiment, the data number of the data latch section 10 was once held in the auxiliary launch section 13 and then held in the main launch section 14 after T hours. This is to prevent malfunctions by not using the number of errors in as a reference number, and other means may be used to perform this operation, and other configurations are not limited to those in the embodiments.

Further, the number of data in the data latch section 10 is displayed on the display section via the data processor 1B, and when the reference number of the full adder 16 exceeds a predetermined number, an overflow warning is issued.
The frequency division ratio can be set appropriately.

In this manner, according to the present invention, since the oscillation frequency when the vehicle passes is compared with the oscillation frequency when the vehicle passes by using the oscillation frequency before the vehicle approaches plus a predetermined number as a reference, only one oscillator serving as the vehicle detection means is provided. Moreover, it is effective in being able to accurately sense the presence or absence of a vehicle without being affected by external factors such as temperature.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing a preferred embodiment of the present invention;
In Figure 2, (al is the sensor oscillation output after frequency division, (b
) is the output of the counter gate 6, (C1 is the strobe signal of the data launch section lO, (dl is the time chart of the recent signal of the counter 9, (al is the strobe signal of the auxiliary latch section 13, (bl is the main Strobe signal of the launch unit 14, (C1 is a time chart of the output of the comparator 17. 1... LC oscillator, la... Coil, 2
... Frequency divider, 2a... Frequency division ratio setting switch. 3...Buffer, 4...N Kaifu, 5...
・Waveform shaper, 6...Counter gate. 7... Main counter, 8... Oscillator, 9...
・Counter, 10.--Data latch section. 11... Counter, 12... Lunch strobe control, 13... Auxiliary unit. 14... Main latch section, 15... Sensitivity setting switch, 16... Full adder, 17... Comparator,
18...Data buffer.

Claims (1)

[Claims] 1. A detection means whose oscillation frequency changes in the direction of increasing when the vehicle is in the proximity position is provided at the vehicle gate, the oscillation frequency of the detection means is counted, and the oscillation frequency is counted for a certain period of time before the vehicle approaches. A reference number is obtained by adding a predetermined number greater than the increase in the oscillation frequency due to external factors such as temperature and smaller than the increase in the oscillation frequency when a vehicle approaches to the count number, and the reference number and the reference number are obtained. A method for detecting a vehicle in a vehicle gate device, wherein the presence or absence of a vehicle is detected by comparing the count number at the same time with the later specified time.