JPS6164527A - Air purification device for car - Google Patents

Abstract

PURPOSE:To improve the air purification capacity of an air purifier by increasing the air blowing capacity of the air blowing unit for the air purifier if the time when smoke density exceeds the threshold value exceeds the preset time. CONSTITUTION:A control device 1 consisting of microcomputers emits light from a light emitting diode 3 through a driving circuit 2 and detects the smoke within a car room flowing in a perforated case C and then inputting the detection voltage through an amplification circuit 5, peak hold circuit 6, and A/D conversion circuit 7. In addition, when the control device determines that the output of the amplification circuit 5 exceeds the preset threshold value and the time exceeds the preset time, a relay 11 is strapped and an air blowing device 12 is actuated at high speed. Then, when the output of the amplification circuit 5 goes below the threshold value, the relay 11 is set to OFF and the air blowing device 112 is actuated at low speed through a relay 10 and a resistor 12a for adjusting the capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air purification device that purifies the air inside a vehicle such as a passenger car.

[Conventional technology]

As exemplified in Japanese Utility Model Application No. 57-69711, it is known that air purification means is activated or stopped depending on whether the pollution of the air inside a vehicle is detected and the value of the detection signal exceeds a predetermined value. There is.

[Problem that the invention seeks to solve]

In conventional equipment, the air purification capacity is based on the blowing capacity of the blower combined with the air purifying filter, but since this blowing capacity is not adjusted, the air purification capacity is adjusted to the appropriate capacity depending on the degree of contamination. Unable to perform purification. For example, if an attempt is made to operate the air purification means when the degree of pollution is low, there are problems such as excessive noise from the blower or unnecessary power consumption.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide an air purification device for a vehicle in which air purification ability is automatically adjusted according to smoke concentration.

[Means and operations for solving the problems] For this reason, the present invention, as shown in FIG. 1, includes an air purifying means whose air purifying ability is adjustable.

The air purification capacity is adjusted, for example, by changing the blowing capacity of the blower. In the present invention, the detection means generates a detection signal having a value corresponding to the degree of pollution of the air inside the vehicle, and the comparison means compares the detected value with a predetermined reference value to generate a comparison signal. Ru. The detection means can be an optical or ion type smoke detector, or an optical type that performs detection operation intermittently.
Furthermore, one that performs cumulative counting operation may also be used.

The reference value of the comparison means is fixed in advance or can be changed as appropriate, and when this reference value is exceeded, it indicates that the smoke density has increased beyond the predetermined reference value. The means of determination is
If the duration of this state in which the reference value is increased exceeds a predetermined time, a determination signal is generated. In other words, when the smoke concentration is considered to have increased considerably beyond the predetermined standard value,
The air purifying capacity of the air purifying means is increased by the regulating means. It should be noted that at a stage before the regulating means is activated, the air purifying means is operated with a small air purifying capacity manually or when the comparing means generates a comparison signal.

〔Effect of the invention〕

According to the present invention, the air purification ability can be changed automatically, and the air purification ability is not suddenly increased because a predetermined delay time is required when increasing the air purification ability, and the noise can be reduced. Fluctuations are also prevented.

〔Example〕

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. The microcomputer 1 includes a light emitting element drive circuit 2 for causing the light emitting element 3 to emit light, and a peak hold circuit 6 for detecting and holding the peak voltage of the amplified output voltage of the light receiving element 4.
, an A/D conversion circuit 7 that converts the output of the peak hold circuit 6 into a digital output, and a relay drive circuit 8.9 that operates the air purifier 12 based on the result of determining the presence or absence of smoke infiltration. The light emitting element 3 and the light receiving element 4 are
Perforated case C placed in the position where smoke flows into the vehicle interior
The light receiving element 4 detects an increase in fJ and scattered light due to smoke that has entered the case.

The location of the microcomputer L is smoke detection case C.
For example, air purifier 1
It is also possible to integrate it with 2.

When the power is turned on, the microcomputer 1 performs initial settings such as sampling time and boat settings in step 100 of the control program shown in FIG. Next, in steps 101 to 104, a light emitting element drive pulse signal as shown in FIG. 4 (bj) is generated, and step 1
At step 05, the received light signal data is taken in. The data is calculated in step 107 and compared with the smoke detection threshold value ■1 in step 108.

Now, when the smoke density changes as shown in FIG. 4 (al), the output of the amplifier circuit 5 has a waveform as shown in fcl.

Before time to, the output of the amplifier circuit 5 is at the threshold value V
Since it does not exceed 1, the answer is N at step 108.

It is judged that. Next, in step 115, since there is no flag indicating LO operation of the air purifier (weak ability, that is, operating the blower device 12 via the resistor 12a in FIG. 2), the determination is No, and the process proceeds to step 114. Step 1
In step 14, it is determined whether the sampling period has elapsed, and when it is determined that the sampling period has elapsed, the process returns to step 101.

At time to, the output of the amplifier circuit 5 exceeds a predetermined threshold value (reference value > V + for the first time, and YES is determined in step 108. In step 109, the LO operation control signal of the air purifier is is output, and in step 110, the time from the time of smoke detection is counted.Step 1
In step 11, a flag indicating the operating state of the air purifier is set. In step 112, the time T1 from the time of smoke detection is
' is determined to have elapsed for T1 time, and if it is determined that the time has elapsed, in step 113, the air purifier is set to Hi operation (resistance 1
, 2a are short-circuited by the relay 11 to operate the blower device 12 at high speed).

Next, after smoke is detected at time to, at time t1, when the output of the amplifier circuit 5 becomes lower than the threshold value V, step 1
At step 08, the determination is NO, and at step 115, it is determined YES, and at step 116, the Hi operation of the air purifier is stopped. The air in this state is generally not completely clean, so it is necessary to continue operating the air purifier. In step 117, the time required to operate the air cleaner for a certain period of time T2 is counted, and when it is determined in step 118 that the time T2 has elapsed, steps 119 to 121 are executed to stop the air purifier and reset the flag and timer. conduct.

As described above, in this device, when the time when the smoke concentration exceeds the threshold value exceeds a predetermined time, the blower device 1 of the air purifier
The air purifying ability of the air purifier can be increased by increasing the air blowing ability of the air purifier, and the air purifying ability can be changed depending on the smoke concentration, for example, from stop to low speed - high speed - low speed. Automatic control can be performed step by step in the order of one stop.

In the above embodiment, the air purifier is activated and stopped based on the smoke detection threshold ■1, but hysteresis can be added by changing the threshold for activating and stopping the air purifier. can do.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a block diagram of an embodiment, and FIG. 3 is a flowchart showing a control program for a microcomputer in the embodiment. FIG. 4 is an operation time chart of the embodiment. ■...Microcomputer, 3...Light emitting element, 4
... Light receiving element, 12 ... Air purifier blower, 1
2a...Resistance for capacity adjustment.

Claims (1)

[Claims] An air purification means for purifying the air inside the vehicle interior whose air purification capacity can be increased or decreased, a detection means for generating a detection signal having a value corresponding to the degree of contamination of the air inside the vehicle, and a value of the detection signal of the detection means being predetermined. a comparison means for generating a comparison signal by comparing it with a reference value; a determination means for generating a determination signal when the duration of the comparison signal of the comparison means exceeds a predetermined time; and adjustment means for increasing capacity.