JP3127410B2 - Oxygen concentration detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen concentration detecting device for measuring the concentration of oxygen in air.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an oxygen concentration detecting device which measures and notifies an oxygen concentration by an oxygen sensor, and there is an oxygen concentration detecting device which displays a measured oxygen concentration as a percentage.

However, in the display method of displaying the oxygen concentration as a percentage as described above, when the user has a good understanding of the effect of the oxygen concentration on the human body, the displayed value indicates how much the current oxygen concentration is. Level, that is, whether it is at a safe level or at a slightly dangerous level, etc. If you do not have such knowledge, what level of oxygen concentration is just from the display There was a problem that it was not possible to determine whether or not there was.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oxygen detector capable of displaying the oxygen concentration in a manner that is easy for a user to understand.

[0005]

The gist of the present invention is that a user can intuitively determine the level of oxygen concentration by displaying areas of similar environment based on the oxygen concentration measured by an oxygen sensor. Is to be understood.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, an electronic timepiece is provided with an oxygen concentration detecting device.

FIG. 1 is a circuit diagram of the oxygen detector of the embodiment. In the figure, a reference clock signal generated by an oscillator 1 is divided by a frequency dividing circuit 2 to a predetermined frequency and output to a time counting circuit 3. The time counting circuit 3 counts the time signal from the frequency dividing circuit 2 to obtain time data, and outputs the time data to the CPU 5 together with the minute carry signal. The date counting circuit 4 counts the day carry signal from the time counting circuit 4 to obtain date data, and outputs the date data to the CPU 5 together with the week carry signal.

[0008] Oxygen sensors 6, for example, oxygen concentration becomes in the air from the galvanic cell type oxygen sensor (strictly oxygen partial is
Pressure) is output. After the output voltage of the oxygen sensor 6 is amplified by the amplifier circuit 7, it is converted into a digital value by the A / D converter circuit 8 and output to the CPU 5. In addition,
The amplification circuit 7 and the A / D conversion circuit 8 are driven by measurement signals output from the CPU 5 at one-minute intervals.

The CPU 5 is a central processing unit for controlling the entire circuit, and includes time and date data counted by the time counting circuit 3 and the date counting circuit 4 and an acid detected by the oxygen sensor 6.
The raw data and the like are stored in the RAM 9, and the display drive circuit 10 is driven to display the data on the display unit 11. In addition, it detects a key operation signal from the key input unit 13 and executes a process corresponding to the key operation.

The altitude and place name correspondence storage ROM 12 is a ROM that stores a plurality of pieces of altitude data and place name data corresponding to the altitude data. The ROM 12, for example regional name "Hakkoda peaks" and altitude data of the region, and altitude data of the area with local name "Mt. Fuji mountain" is stored, the oxygen sensor in the region selecting process to be described later
The area name of the altitude corresponding to the output of the
Will be displayed.

The display section 11 comprises a liquid crystal display or the like.
At the upper part, a level display section 11a composed of ten display bodies indicating the oxygen concentration level is provided. In this example,
Each time the display decreases by 1% from the reference oxygen concentration (about 21%), the above-mentioned display members are turned on one by one to display the oxygen concentration at that time.

At the center of the display section 11, a place name display section 11b composed of a dot matrix display is provided, and the place name display section 11b displays a place name corresponding to the output of the oxygen sensor. . In addition, a time display section 11c for displaying the current time is provided at a lower portion thereof.

FIG. 2 is a configuration diagram of a register of the RAM 9. The RAM 9 includes a measured oxygen concentration storage unit X for storing measured oxygen concentration data detected by the oxygen sensor 6, a reference oxygen concentration storage unit Y for storing reference oxygen concentration data, Oxygen level storage unit Z that stores level data indicating the level of the
And a reference altitude storage unit L for storing a reference altitude preset by a user, and an altitude storage unit H for storing altitude data obtained from the output of the oxygen sensor .

Next, the operation of the embodiment having the above configuration will be described with reference to the flowchart of FIG. First,
In step S1 of FIG. 3, it is determined whether or not a minute carry signal has occurred. If the minute carry signal has been generated, it is the timing for measuring the oxygen concentration every minute, and therefore, step S2
Drives the amplification circuit 7 and the A / D conversion circuit 8 to measure the oxygen concentration detected by the oxygen sensor 6, and stores the measured data in the measured oxygen concentration storage unit X. Further, in step S3, the oxygen concentration level at that time is calculated.

FIG. 4 is a more detailed flowchart of the oxygen concentration level calculation processing in step S3. In the following description, X and Y indicate the measured oxygen concentration storage unit X, the reference acid concentration storage unit Y, or data stored in those storage units.

In step S21 of FIG. 4, it is determined whether or not the measured oxygen concentration data X is smaller than the reference oxygen concentration data Y. When the measured oxygen concentration data X is not smaller than the reference oxygen concentration data Y, that is, when X ≧ Y, the process proceeds to step S22, and “0” is set as the level data in the oxygen concentration level storage unit Z. This state is a case where the measured oxygen concentration data X is equal to or larger than the reference oxygen concentration data Y. All the ten display members of the oxygen concentration display section 10a are turned off and the oxygen concentration is equal to or higher than the reference value. Is specified.

If the determination in step S21 is YES, the process proceeds to step S23, where the measured oxygen concentration data X is less than the reference value Y and is 99% or more of the reference value Y (Y> X ≧ Y · 99).
/ 100) is determined. When the measured oxygen concentration data X is within the above range, the process proceeds to step S24, and “1” is set as the level data in the oxygen concentration level storage unit Z. This state is a case where the oxygen concentration measured this time is at most 1% lower than the reference oxygen concentration, and one display of the oxygen concentration display section 10a lights up to clearly indicate that the oxygen concentration is 1% lower than the reference value. You.

If the determination in step S23 is NO, the process proceeds to step S25, where the measured oxygen concentration data X is set to Y · 99/1.
It is determined whether or not 00> X ≧ Y · 98/100. When the measured oxygen concentration data X is in the above range, "2" is set as the level data in the oxygen concentration level storage unit Z in step S26. This state is a case where the oxygen concentration data X measured this time is 1% to 2% lower than the reference oxygen concentration, and two display members of the oxygen concentration display section 10a light up to clearly indicate that the oxygen concentration is 2% lower. You.

If the determination in step S25 is NO, the measured oxygen concentration data X is similarly changed to the reference oxygen concentration data Y
It is determined in order from 2% to 3% lower range, 3% to 4% lower range,..., And a numerical value corresponding to the oxygen concentration level storage unit Z is set based on each determination result.

In step S27, it is determined whether or not the measured oxygen concentration data X is in the range of Y · 92 · 100> X ≧ Y · 91/100.
At step 8, "9" is set as the level data in the oxygen concentration level storage section Z. This state is a case where the oxygen concentration data X measured this time is 8% to 9% lower than the reference oxygen concentration. Nine display members of the oxygen concentration display section 10a are turned on and the oxygen concentration is 9% lower than the reference value. Is specified.

If the determination in step S27 is NO, "10" is set as the level data in the oxygen concentration level storage section Z in step S29. In this state, the oxygen concentration measured this time is lower than the reference value by 9% or more, and all the ten display members of the oxygen concentration display section 10a are turned on to clearly indicate that the oxygen concentration is lower than the reference value by 9% or more. Is done.

When the oxygen concentration level calculation processing is completed in this way, the flow returns to step S4 in FIG.
Is executed to obtain altitude data corresponding to the measured oxygen concentration X, and the altitude data is set in the altitude storage unit H. Here, L is the altitude of the point (reference point) where the oxygen detecting device is preset by the user, and in the above processing, the measured oxygen concentration X is obtained from the altitude data L and the oxygen concentration Y of the reference point. Is converted to altitude data.

FIG. 5 is a diagram showing the relationship between the atmospheric pressure and the output voltage of the oxygen sensor. As shown in FIG.
There is a proportional relationship between the output voltage of
From the output of the oxygen sensor, the atmospheric pressure at that point can be obtained. The altitude can be calculated from the atmospheric pressure . Note that the graph shown by the solid line in FIG. 5 shows the characteristics when the temporal change of the output of the oxygen sensor 6 is corrected, and the graph shown by the broken line shows the characteristics when the temporal change is not corrected. The output voltage of the sensor decreases due to the change over time by the difference.

If the output of the oxygen sensor is highly converted,
In the area selection processing in step S5, the area name corresponding to the altitude is searched from the altitude / local correspondence storage ROM 12.
Next, in step S6, it is determined whether a weekly carry signal has occurred. When the week carry signal is generated, it is the correction timing of the reference oxygen concentration for each week, and the next measured value is stored in the measured oxygen concentration storage unit X in the next step S7.
Further, in step S8, the current measured value is stored in the reference oxygen concentration storage unit Y as a reference value. With these processes, the measured value of the oxygen concentration is taken in as a reference value every week, and the temporal change of the output voltage of the oxygen sensor 6 is corrected.

Thereafter, in the display process of step S9, the area, oxygen concentration level and current time data corresponding to the measured oxygen concentration obtained in the above process are displayed on the display unit 11. According to this display processing, for example, if the measured oxygen concentration is substantially equal to the peak of Mt. Hakkoda, “Mt. It can be determined that there is.

If the minute carry signal has not been generated in step S1, the flow advances to step S10 to determine whether a key input has been made. When the key input is being performed, the key processing of step S11 is executed. In this key processing, for example, a reference altitude preset by the user and atmospheric pressure data at that time are stored in the RAM 9.

In this embodiment, since the area name is displayed by the output of the oxygen sensor , the user can display whether the current environment is at a normal level or at a lower level than usual. It can be understood intuitively from the name of the area where it is done.

FIG. 6 is a graph showing the altitude change of a mountain .
FIG. 6 is an explanatory view of a second embodiment of the present invention, which is indicated by a lock. This
In the embodiment of FIG. 6, as shown in FIG.
Graphic display such as "1000m" and altitude "2000m" is used.

In this embodiment, since the output of the oxygen sensor is graphically displayed as a change in the height of the mountain, it can be more intuitively understood visually .

The present invention may be a dedicated device for measuring the oxygen concentration, or may be incorporated in electronic equipment other than the electronic timepiece.

[0031]

According to the present invention, the output of the oxygen sensor is controlled.
Since the corresponding area is displayed, the level of the oxygen concentration can be intuitively understood from the name of the area.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an oxygen concentration detection device according to an embodiment.

FIG. 2 is a configuration diagram of a register of a RAM.

FIG. 3 is a flowchart showing the operation of the embodiment.

FIG. 4 is a flowchart of an oxygen concentration level calculation process.

FIG. 5 is a diagram showing a relationship between an atmospheric pressure and an output voltage of an oxygen sensor.

FIG. 6 is an explanatory diagram of a display example of the second embodiment.

[Explanation of symbols]

 5 CPU 6 Oxygen sensor 11 Display section 11b Place name display section 12 Altitude, place name correspondence storage ROM

Claims (2)

(57) [Claims] Obtained a galvanic cell type oxygen sensor [1 claim], the altitude data from the output of the oxygen sensor at every predetermined time
A calculation unit that, the oxygen concentration detection apparatus comprising: a display means for displaying a high degree of regional obtained by this computing means. Obtained a galvanic cell type oxygen sensor [2 claim ## altitude data from the output of the oxygen sensor at every predetermined time
A calculation unit that, a local storage means for storing a plurality of the regional data indicating an area of the altitude data and said altitude data, the area corresponding to the elevation data obtained by said calculation means,
An oxygen concentration detection device comprising: a search unit that searches from the region storage unit; and a display unit that displays the region searched by the search unit.