JPH06100353B2 - Air purification system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air cleaning system for cleaning the air in a room such as an automobile by ventilation.

[Background technology]

In the conventional air cleaning system of this type, when a certain level of smoke in a room reaches a certain level, the fan motor of the air cleaner is operated to clean the room.
However, when the smoke density reached a certain level, the fan motor was only operated, and ventilation according to the smoke density could not be performed.

[Object of the Invention]

INDUSTRIAL APPLICABILITY According to the present invention, the ventilation capacity can be exhibited according to the level of smoke concentration in the interior of an automobile or the like, and an output signal having data of two or more values of the smoke sensor can be output without increasing the number of wires. An object of the present invention is to provide an air cleaning system, and in addition, in the second invention, a high speed operation of a fan motor of an air cleaner can be stopped after a low speed operation to give a natural feeling to a user. It is intended to provide an air cleaning system.

[Disclosure of Invention]

FIG. 1 shows an overall configuration diagram of the present invention, in which (1)
Is a smoke sensor that detects the smoke concentration in the interior of an automobile,
(2) is an air purifier control unit that operates the fan motor of the air purifier (3) at high speed, at low speed, or stops it according to the output signal from the smoke sensor unit (1). Is. (4) is a setting changeover switch, and this setting changeover switch section (4) is a manual "OFF" for stopping the system by a changeover switch SW, and the smoke sensor section (1).
"Automatic" operation by the output signal from, and manual "low speed"
And manual "high speed" can be arbitrarily switched and set. (5) is a power source such as a storage battery, and (6) is a fuse.

FIG. 2 shows an example circuit of the smoke sensor section (1). This smoke sensor section (1) is a voltage Vcc of the power source (5).
Constant voltage part (7) for making the voltage of the light emitting diode LED, the light emitting diode pulse driving part (8) for pulse driving the light emitting diode LED, and the light receiving signal of the light receiving element SPD for receiving the pulsed light signal of the light emitting diode LED (9) which amplifies
A detection unit (10) for discriminating the level of the amplified output of the amplification unit (9), and a pulse width conversion output for generating an output pulse width converted according to the output period of the detection signal of the detection unit (10) It is composed of a part (11).

Referring next to the operation of the smoke sensor unit (1), the first is energized, the transistor Tr ₂ of the light-emitting diode pulse driving unit (8) is turned on to flow the base current of the transistor Tr _3, the transistor Tr ₃ Turn it on. When the transistor Tr ₃ is turned on, the capacitor C ₃ is charged through the transistor Tr ₃ and the resistor R _6, and when the charging pressure of the capacitor C ₃ reaches a predetermined level, the transistor Tr ₄ is turned on,
A current is applied to the light emitting diode LED to cause it to emit light. This light emission level gradually decreases due to the discharge of the capacitor C ₃ . Then, when the voltage of the capacitor C ₃ drops to a predetermined level, the transistor Tr ₄ is turned off, the power supply to the light emitting diode LED is cut off, and the light emission is stopped. At the same time that the transistor Tr ₄ is turned off, the capacitor C ₃ is charged again, and the transistor Tr ₄ is maintained in the off state until the voltage across the capacitor C ₃ reaches a predetermined level. Transistor Tr ₄ in this manner is intermittently turned ON drive is a light-emitting diode LED of being pulsed manner emission driving as shown in FIG. 3 (a). The light of the light emitting diode LED is not directly received by the light receiving element SPD but is received by diffuse reflection by smoke, and the higher the smoke concentration, the higher the light receiving level. However, the light receiving signal of the light receiving element SPD is the transistor Tr _{5 to} Tr ₈
The amplified output is input to the inverting input terminal of the comparator OP1 via the capacitor C ₇ and the resistors R ₁₈ and R
It is compared with the reference voltage Vref obtained by dividing the voltage with ₁₉ . Meanwhile and summer as the voltage across the capacitor C ₃ is applied to the base of the transistor Tr ₉ via a resistor R _6, R _21,
It turns on in synchronization with the light emitting period of the light emitting diode LED. Therefore, when the level input to the inverting input terminal of the comparator OP1 exceeds the reference voltage Vref, the output of the comparator OP1 changes from “H” to “L” level. Transistor T
through r ₉ capacitor C ₈ charging s stream flows through the capacitor C ₈
Is charged. The charging voltage of the capacitor C ₈ is input to the non-inverting input terminal of the comparator OP2, divided by the resistors R ₂₄ and R ₂₅ , and compared with the reference voltage Vref ′ input to the inverting input terminal. if There reference voltage Vref 'than the comparator OP2 is to generate through the resistor R ₂₆ from the output terminal OUT an output of "H" level. This generation period is determined by the charge amount of the capacitor C ₈ , and its maximum value is when the capacitor C ₈ is charged to the output voltage V _{0 of the} constant voltage section (7), and the generation period does not increase beyond that. Of.

Then, when smoke is generated and the smoke density is low, the level of the output signal of the amplifier (9) is low as shown in (b) of FIG. 3, and the sloped portion of the waveform indicates the reference voltage Vref of the comparator OP1. There is only a short period of time. Due to this short period, the charged amount of the capacitor C ₈ is small,
Therefore, the period over which the reference voltage Vref ′ of the comparator OP2 exceeds the reference voltage Vref ′ is shortened and the output terminal OU is output as indicated by b ′ in FIG.
The pulse width of the signal output from T becomes smaller. When the smoke density becomes high, the level of the output signal of the amplifying section (9) becomes high, the slope portion of the waveform of the output signal far exceeds the reference voltage Vref of the comparator OP1, and the period of exceeding it becomes long (see FIG. In b) b), the energization period of the charging flow for charging the capacitor C ₈ via the comparator OP1, the transistor Tr ₉ , and the resistor R ₂₂ is long, and the charging amount is increased accordingly. As a result, the reference voltage Vre of the comparator OP2
The period during which the comparison input falls below f'becomes longer, and an output signal having a large pulse width is generated from the output terminal OUT as shown at b'in FIG. 3 (c).

In this way, the smoke sensor unit (1) can generate an output signal having a pulse width according to the smoke concentration, and by discriminating the pulse width, ventilation according to the smoke concentration can be performed. is there.

FIG. 4 shows an embodiment circuit of the air purifier control unit (2). The air purifier control unit (2) has a pulse width determination unit (12) and a detection pulse of the pulse width determination unit (12). A timer unit (1 set with two sets of timer circuits that operate according to the width)
3), the relay drive section (14) for driving the corresponding relays Ry ₁ and Ry ₂ according to the output of each timer circuit, and each relay
A fan motor M of the air purifier that is driven when the relay contacts r ₁ and r ₂ of Ry ₁ and Ry ₂ are on, and a current limiting resistor R _L that limits the current to the fan motor M when the relay contact r ₁ is on. It consists of

Next, the operation of the air purifier control unit (2) will be described.

First, the pulse width judgment unit (12) is the input resistance R _IN × capacitor C
It is equipped with two sets of time constant circuits having a relationship of ₁ <input resistance R _IN <C ₂ , and when an input signal with a small pulse width is input to the input terminal IN, the comparator OP3 is inverted and an input signal with a large pulse width is input. Comparator OP when input to input terminal IN
3 and OP4 are both inverted, and if a signal with a small pulse width of t ₁ shown in (a) of FIG. 5 is input from the smoke sensor unit (1), the output of the comparator OP3 is inverted from "H" to "L", to charge the capacitor C ₄ of the timer unit (13). During the period T ₁ until the voltage across the capacitor C ₄ reaches a predetermined level, the comparator OP5 inverts the output to "H" as shown in FIG. 5 (b). That is, the capacitor C ₄ , the resistor R _9, and the comparator OP 5 constitute the first timer circuit, and the transistor Tr ₀₁ of the relay drive unit (14) is turned on and the relay Ry ₁ is turned on while the output is “H”. Drive. Driven relay contact r of this relay Ry _1
1 turns on as shown in Fig. 5 (d), and the fan motor M
A drive current is passed through the resistor R _L to drive the fan motor M at a low speed.

When a signal with a large pulse width of t ₂ is input from the smoke sensor unit (1) as shown in Fig. 5 (a), the comparator OP
3 inverts the output as described above and the comparator OP4
Also inverts the output. When the comparator OP4 is inverted,
While the capacitor C ₅ of the timer section (13) is charged and the voltage across the capacitor C ₅ reaches a predetermined level, the comparator OP6 outputs “L” as shown in FIG. 5 (d) like the comparator OP5. From "H" to the relay drive (1
Turn on transistor Tr _{02 in} 4) to drive relay Ry ₂ . Relay contacts r ₂ of the relay Ry ₂ and relay contact r ₁ resistance R _L
And the relay contact r ₂ is connected in parallel to the series circuit, and a large current flows through the fan motor M through the relay contact r ₂ while the relay contact r ₂ is on as shown in FIG. 5 (e). The fan motor M will be operated at high speed.

Here, the resistor R ₁₀ , the capacitor C ₅ , and the comparator OP6 form a second timer circuit, and C ₄ × R ₉ > C ₅ × R ₁₀
When a set constant relationship when called, connexion first time T ₂ is the output of the elapsed after the comparator OP6 is returned to "L" to "H", turns off the transistor Tr _02, to return the relay Ry _2. The return of the relay Ry ₂ turns off the relay contact r _2, but the fan motor M has the relay contact r ₁ and the resistance R _{L being on.}
Since a current flows through and, the operation of the fan motor M is switched from high speed operation to low speed operation, and then the comparator
Until OP5 reverses the output from "H" to "L" and restores relay Ry ₁ , low-speed operation will be continued, and there will be a natural change in operation without sudden stop from high-speed operation. Can be given. In the embodiment, the T ₁ and T ₂ periods are set to about 60 sec and about 30 sec, and the pulse widths t ₁ and t ₂ are set to about 0.1 sec and 0.2 sec.

In the figure, I ₀ is a switching terminal for manual "low speed", I ₁ is a switching terminal for manual "high speed", and the output signal of the smoke sensor unit (1) is input during "automatic" switching in FIG. A switch SW is provided to connect to the terminal IN and shut off the power when the switch is OFF.

By the way, the pulse width conversion output section (11) of the smoke sensor section (1)
Is for discriminating a period in which the amplified output obtained according to the smoke concentration exceeds the reference voltage Vref and changing the pulse width according to this period. However, as in the circuit shown in FIG. It is discriminated by the comparators OP7 and OP8 of the detection unit (10) 'whether the peak value exceeds the predetermined level of a plurality of stages (two stages in the embodiment), and they are provided corresponding to the comparators OP7 and OP8, respectively. The timer circuits (11a) and (11b) of the pulse width conversion output section (11) 'are driven to drive the timer circuit (11a).
It is also possible to generate an output signal having a pulse width determined by the time limits of a) and (11b).

In the figure, A, B, and C are points corresponding to points A, B, and C in FIG. 2, and GND is connected to the negative power supply line in FIG.

〔The invention's effect〕

Since the present invention configures the smoke sensor section as described above, the smoke sensor section can generate an output signal having a pulse width corresponding to the level of smoke concentration. Since the smoke concentration level data is output from the smoke sensor unit, the number of signal lines is the same as that of the conventional one-value data type smoke sensor unit, and the number of wires does not increase. Since it has an air purifier controller that controls the operation of the air purifier according to the pulse width of the output signal by inputting an output signal having The drive unit has an inclined part where the level drops sharply from the peak in the optical signal waveform of the light emitting diode that intermittently emits a plurality of lights in a short time. Pulse width corresponding to the smoke density is obtained,
Therefore, it is possible to deal with the phenomenon peculiar to smoking in the passenger compartment and it can be said that it is very effective for air cleaning, and moreover, the rising of the light emission of the light emitting diode is made to emit light with a large driving current, and it exists in the vehicle at that time The air purifier can be operated effectively by reliably detecting even the smoke with a low concentration, and the output signal of the smoke sensor to the air purifier control unit has a pulse width according to the smoke concentration. Therefore, even if the smoke sensor unit and the air purifier control unit are installed apart from each other, a signal can be transmitted from the smoke sensor unit to the air purifier control unit without being affected by the noise level. Play.

Further, in the second aspect of the invention, since the air purifier control section is provided with the control means for stopping the operation of the air purifier after the low speed operation during the high speed operation as described above, it is not suddenly stopped from the high speed operation. The operation change of the air purifier according to the change of the smoke density in the room can be impressed to the user, and a natural feeling of use is provided.

[Brief description of drawings]

FIG. 1 is a basic circuit block diagram of the present invention, FIG. 2 is a circuit diagram of a smoke sensor portion of one embodiment of the present invention, FIG. 3 is a time chart of each portion of the same, and FIG. 4 is air cleaning of the same. Fig. 5 is a circuit diagram of the control unit, and Fig. 5 is a time chart of each unit of the same.
The figure is a circuit diagram of another embodiment in which a part of the smoke sensor section can be omitted. (1) is a smoke sensor section, (2) is an air purifier control section, (8) is a light emitting diode pulse drive section, (9) is an amplification section, (10) is a detection section, and (11) is a pulse width conversion output section.

Claims (4)

[Claims] 1. A light emitting diode drive section for intermittently emitting a light emitting diode, an amplification section for receiving and amplifying light of the light emitting diode, a detection section for discriminating an amplification output level of the amplification section, and a detection section. It has a smoke sensor section having a pulse width conversion output section for generating an output signal having a pulse width corresponding to the amplified output level discriminated, and operates the air purifier according to the pulse width of the output signal of the smoke sensor section. An air purifier control unit for controlling the speed is provided, and the light emitting diode drive unit has a slope portion where the level of the light signal of the light emitting diode for intermittently emitting a plurality of lights in a short time has a level suddenly decreasing from the peak. Air cleaning system characterized by. 2. A detection unit for comparing the amplified output level of the amplification unit with a reference voltage to discriminate a period when the amplified output level exceeds the reference voltage, and an output signal having a pulse width corresponding to the discrimination period of the detection unit. The air cleaning system according to claim 1, further comprising a smoke sensor unit having a pulse width conversion output unit for generating the smoke sensor. 3. A detection unit for comparing and discriminating a peak value of an amplified output level of the amplification unit with a plurality of reference values, and a pulse width for generating an output signal having a preset pulse width corresponding to the discriminated peak value. The air cleaning system according to claim 1, further comprising a smoke sensor unit having a conversion output unit. 4. A light emitting diode drive section for causing a light emitting diode to emit light intermittently, an amplifying section for receiving and amplifying light of the light emitting diode, a detecting section for discriminating an amplified output level of the amplifying section, and the detecting section. It has a smoke sensor section having a pulse width conversion output section for generating an output signal having a pulse width corresponding to the amplified output level discriminated, and operates the air purifier according to the pulse width of the output signal of the smoke sensor section. In an air cleaning system having an air purifier control unit for controlling the speed, a pulse width determination unit for discriminating the pulse width of the output signal from the smoke sensor unit into a plurality of stages, and a corresponding pulse width determination unit A plurality of timer means for generating a timer output for a predetermined time set by the pulse width discrimination output from the A control means for driving the fan motor of the air purifier and controlling the rotation speed is provided, and the corresponding discrimination is performed by setting the time limit time of each timer means so that the larger the pulse width becomes, the shorter the time limit time becomes. An air cleaning system characterized in that the control speed of the fan motor of each control means is set so that the speed of the fan motor becomes smaller as the pulse width becomes smaller.