JPS5815895Y2 - Kuukiseijiyoukino Mezumarihiyoujisouchi - Google Patents

Description

[Detailed description of the invention] This invention is based on the idea that the element of the vehicle air purifier is
Dust and other particulates in the air cause clogging,
In order to prevent deterioration of engine performance and damage to other parts, when the element becomes clogged, the driver is automatically and immediately made aware of the condition and takes appropriate actions such as cleaning or replacing the element. This invention relates to a clogging display device for an air purifier that allows the user to take appropriate action.

Most of the conventional air purifier clogging display devices judge the clogging state only by the negative pressure inside the air purifier, and the ventilation resistance of the element is the standard for determining the clogging state of the element. Even if the negative pressure is the same, the negative pressure changes depending on the engine speed and load, so it is extremely unreasonable to determine the clogging state simply based on the negative pressure value.

In other words, in experiments conducted by the present inventors, even if the same element is clogged, it is several hundred mmAq at high rotation and high load, and several tens of mmAq at low rotation and low load. If this is the case, if negative pressure is set in a high rotation and high load area, it will be determined that there is no clogging in a lower rotation and low load area.

On the other hand, if the setting is made in a low rotation and low load range, there is a very serious problem in that in a higher rotation and high load range, even if there is no clogging, a determination is made that the valve is in a clogged state.

The present invention has been developed by experimentally confirming that the negative pressure on the artificial side and the negative pressure on the outlet side of an air purifier element are in a unique relationship that increases and decreases in response to increases and decreases in the amount of air passing through them, and based on this experimental result. This system was developed with the aim of electrically detecting the negative pressure on the inlet side of the element and the negative pressure on the element outlet side using two pressure transducers made of pressure-sensitive semiconductors such as piezo elements, differential transformers, etc. , and an electric circuit unit that adjusts the electric signal on the element inlet side so that the electric signal on the element inlet side matches the electric signal on the element outlet side at a predetermined time of clogging, and the electric circuit unit compares both electric signals. However, by activating indicators such as lamps and buzzers using the output signal of this electric circuit, it is possible to accurately detect and display the degree of clogging of the element without causing the above-mentioned problems. The purpose is to provide a display device.

The present invention will be explained below with reference to an embodiment shown in the drawings. In FIG. It is connected to the engine main body 4.

Reference numeral 5 denotes an element installed inside the air cleaner 1 via a gasket 6, which constitutes a filter body.

7 is a cap, and 8 is a case. The cap 7 and the case 8 form the main space of the air purifier 1, and the space is separated by the element 5 into an outer space a and an inner space. There is.

9 is an air inlet pipe attached to the side surface of the case 8.

Pipes 10 and 11 are attached to the cap 7 and the air inlet pipe 9 by, for example, welding or brazing, and are connected to a first pressure transducer 14 and a second pressure transducer 15 through rubber hoses 12 and 13. It's becoming easier to communicate.

Here, the first pressure transducer 14 and the second pressure transducer 15 are made of a pressure sensitive semiconductor whose resistance value changes depending on pressure, such as a piezo element, and there is a negative pressure on the element outlet side and a negative pressure on the element inlet side. It detects negative pressure and converts it into electricity.

The first pressure transducer 14 and the second pressure transducer 15 can also be configured using a differential transformer, a strain gauge, or the like.

16 and 17 are the first. An amplifier 18 amplifies the electrical signals of the second pressure transducers 14 and 15; a comparator 19 that compares the electrical signals of the first and second pressure transducers 14 and 15 amplified by the amplifiers 16 and 17; is a display device such as a lamp or a buzzer whose operation is controlled by the output signal of the comparator 18, and is installed in the instrument panel inside the vehicle interior.

20 is a power source battery for the automobile. 20 is a key switch, 22 is a fuse, and 23 is a constant voltage supply circuit.

Note that the amplifier IE', 17, and comparator 18 constitute an electric circuit section.

FIG. 2 illustrates a specific circuit of the electric circuit section in the device of the present invention.

Next, to explain the operation of the device of the present invention in the above configuration, when the key switch 21 is turned on and the engine is started, the air passes through the air purifier 1 and the carburetor 2 to the engine main body 4.
fresh air is inhaled.

Along with this intake of fresh air into the engine body 4, the air purifier 1
The element outlet side (the element inner space or the intake pipe part of the engine intake port) and the element inlet side (the inner part of the air inlet pipe 9 or the element outer space a) are in a negative pressure state.

At this time, the negative pressure relative to the amount of intake air inside the air inlet pipe 9 is as shown in FIG. 3 according to experiments conducted by the present inventors.

In other words, it can be seen that the negative pressure at the air inlet pipe increases or decreases uniquely in response to increases or decreases in the amount of intake air.

In addition, the degree of clogging of the element and the negative pressure inside the element depending on the amount of intake air are as shown in Fig. 4 in experiments conducted by the inventors, and even if the element 5 is clogged to the same degree, the negative pressure inside the element changes depending on the amount of intake air. You can see that it changes.

In other words, since the amount of intake air is determined by the engine speed and load, it can be recognized that even if the degree of clogging is the same, the negative pressure inside the element differs depending on the operating conditions of the engine.

Here, the degree of element clogging of 100φ means that the increase in ventilation resistance of the air purifier at the rated intake air amount is 300 m.
This refers to the state in which mAq has been reached.

In addition, in Fig. 4, the clogging limit of the element is set to 50
If it is assumed to be excellent, the relationship between the amount of intake air and the negative pressure inside the element when clogging is 50% is as shown in FIG.

In the experiment conducted by the present inventors, the element clogging limit was set at 50%, considering that the increase in airflow resistance of the air purifier at the rated intake air amount was 150 mmAq.

When the above figures 3 and 5 are summarized, the line diagram f in figure 6 is
2g, and when the negative pressure ratio of the line f2g is determined, it is approximately 1.3 in the inventors' experiments, and if the negative pressure of the line f, that is, the air inlet pipe section, is multiplied by 1.3, the line diagram in Figure 6 is obtained. It was found that this almost coincides with the diagram g showing the negative pressure inside the element at 50% clogging.

Therefore, if the electric signal of the second pressure transducer 15 that detects the negative pressure of the air inlet pipe section when the element 5 is clogged for 50 hours is multiplied by 1.3, the first pressure transducer 14 electrical signals.

In this embodiment, based on this experimental result, the second pressure transducer 1
The amplification degree of the amplifier 17 that amplifies the electric signal of the first pressure transducer 14 is set to be 1.3 times the amplification degree of the amplifier 16 that amplifies the electric signal of the first pressure transducer 14.

In this way, until the clogging of the element 5 exceeds 50%, the electrical signal of the second pressure transducer 15 is amplified by the output signal of the amplifier 16 that amplifies the electrical signal of the first pressure transducer 14. The output signal of amplifier 17 is thicker.

Therefore, the output signal of the comparator 18 becomes a "1" signal, and the display 19 is energized.

If the indicator 19 is a lamp, it lights up.

To further explain this state using Figures 4 and 6, when the clogging of element 5 is X%, which is less than 50%, the negative pressure inside the element becomes line i in Figure 6, and from line g. Since it is small, the output signal of the comparator 18 becomes a "1" signal.

As the clogging of the element 5 progresses, the negative pressure inside the element gradually moves from the above diagram i toward the diagram g, and when the clogging of the element 5 exceeds 50%, the amplifier The magnitudes of the output signals of amplifiers 16 and 17 are reversed, and the output signal of amplifier 16 becomes larger.

Then, the output signal of the comparator 18 becomes an "O" signal, and the power to the display 19 is cut off.

As a result, the indicator 19 becomes inactive (if it is a lamp, it goes out), and the driver is notified that the element 5 is clogged.

In this way, in FIG. 6, the diagram f is set by multiplying it by about 1.3, in other words, the electric signal of the first pressure transducer 14 at a predetermined time of clogging is converted into the second pressure. Vessel 1
By adjusting the electrical signals in step 5 to match, the following problems will be eliminated.

That is, in FIG. 6, if the predetermined number of people f is set, the line diagram g
Since the amount of intake air relative to the negative pressure changes in the graphs F and F, the intake air amount reaches a predetermined negative pressure according to the graph G, but does not reach the negative pressure in the graph F.

As a result, the negative pressure at a predetermined time of clogging can be adjusted to
If it is set in a high load operating range, it is determined that there is no clogging in lower rotation and lower load operating ranges.

It is clear that such a problem does not occur in this example.
In the above-described embodiment, when the clogging of the element 5 exceeds the set limit, the display 19 is put into a dormant state to notify that the element 5 is clogged.
Of course, clogging of the element 5 may be notified by activating the element 9.

As detailed above, in the present invention, the negative pressure on the element inlet side increases or decreases depending on the amount of intake air, and the negative pressure on the element outlet side increases or decreases depending on the clogging of the element and the amount of intake air. The negative pressure on the inlet side is detected by the second pressure transducer, and the negative pressure on the element outlet side is detected by the first pressure transducer at each valley. The electrical signal of the second pressure transducer is adjusted in an electrical circuit section so as to match the electrical signal, and the electrical signal of the rain detector is compared with the electrical signal of the second pressure transducer. Since the operation of the device is controlled, there is an excellent effect that a predetermined clogging can be accurately determined while taking into consideration the amount of intake air.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the system of the air purifier clogging indicator of the present invention, Figure 2 is an electric circuit diagram of the device of the present invention, and Figure 3 is a characteristic diagram of the negative pressure of the air inlet pipe relative to the amount of intake air. , Fig. 4 is a characteristic diagram of the negative pressure inside the element with respect to the degree of element clogging at each air amount, and Fig. 5 is a characteristic diagram of the negative pressure inside the element with respect to the intake air quantity when the element clogging degree is 50 in Fig. 4. FIG. 6 is a characteristic diagram of the pressure of each member with respect to the amount of intake air. 1... Air purifier, 5... Element, 9... Air inlet pipe, 10, 11...
Pipe, 12, 13...Hose, 14, 15.
...First. Second pressure transducer, 16, 17...
...Amplifier, 18...Comparator, 19...
··display.

Claims (1)

[Scope of utility model registration request] A first pressure converter 14 detects the degree of clogging of the element of the air purifier as a negative pressure on the outlet side and converts it into an electrical quantity; A second pressure transducer 15 detects negative pressure on the element inlet side of the purifier and converts it into an electrical quantity, and electrical signals from both positive force transducers 14 and 15 are inputted, and Adjust the electrical signal of the second pressure transducer 15 so that the electrical signal of the second pressure transducer 15 matches the electrical signal of the first pressure transducer 14 at the time of clogging, and an electric circuit unit that compares the electric signal of the pressure transducer 15 with the electric signal of the first pressure detector 14 to generate an output signal; and an indicator 19 whose operation is controlled by the output signal of this circuit unit. A clogging indicator for an air purifier.