JPS6249210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an on-vehicle air purifying device including a delay circuit in an automatic control circuit.

[Background technology]

The automatic control circuit 1' of the conventional air purifying device is composed of a smoke detection section 2 and an output section 4, as shown in FIG. A smoke sensor that receives light scattered by particles with a light receiving element, an amplifier unit that amplifies a signal obtained by converting light into electricity by the light receiving element, and a determination unit that compares and determines the output voltage of the amplifier unit with a predetermined reference voltage. The output section 4 controls the air cleaner 5 based on the output of the smoke detection section 2. However, in the above-mentioned circuit, when an output due to transient noise etc. is output from the smoke detection section 2, the output section 4 does not have any discrimination ability, so it responds sensitively to the output of the smoke detection section 2. to start and stop the air cleaner 5. Therefore, when the smoke detection section 2 continuously outputs an output due to noise, the output section 4 repeatedly starts and stops the air cleaner 5, which causes discomfort to the human body. Furthermore, if a smoke scattering light condition that repeatedly generates voltages in the vicinity of above and below the reference voltage of the judgment section of the smoke detection section 2 continues, there is also the drawback that the same start and stop as described above will occur. was.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent repeated starting and stopping of the air purifier due to transient noise, etc. is to provide.

[Disclosure of the invention]

(Embodiment) FIGS. 1 to 3 are diagrams showing an embodiment of the present invention. Reference numeral 1 denotes an automatic control circuit, which, as shown in FIG. 1, is arranged on the ceiling near the room lamp 12 where smoke reaches the vehicle interior first. As shown in FIG. 3, this automatic control circuit 1 is composed of a smoke detection section 2, an output section 4, and a delay circuit 3 according to the present invention, which have the same configuration as the conventional example. Reference numeral 6 denotes a changeover switch, which is disposed near the driver's seat 10 for easy operation as shown in FIG. 1, and is a four-contact switch as shown in FIG. 2. The common terminal side of the changeover switch 6 is connected to the battery 8, the terminal 6a is turned off, the terminal 6b is connected to the automatic control circuit 1, and the terminals 6c and 6d constitute a manual control circuit. Reference numeral 5 denotes an air cleaner, which is disposed on the rear package tray 11 as shown in FIG. 1, and has a high-speed rotation terminal 5a and a low-speed rotation terminal 5b as shown in FIG. , 6d, respectively. Further, one of the terminals 5a and 5b is connected to the output of the automatic control circuit 1. In this embodiment, it is connected to the terminal 5b.

Before using the present invention, the changeover switch 6 is connected to the terminal 6a and the air cleaner 5 is stopped, as shown in FIG. If smoke occurs here, the selector switch 6 is switched to one of the terminals 6b, 6c, and 6d. First, if we change the changeover switch 6 to the terminal 6c, the voltage of the battery 8 will change to the air purifier 5.
is applied to the high-speed rotation terminal 5a. Here, the air cleaner 5 includes a fan motor 7 as shown in FIG. 2, and a high-speed rotation terminal 5a is connected to a high-speed rotation control section of a rotation speed control circuit built into the fan motor 7. Therefore, the air cleaner 5 operates strongly due to the voltage applied to the high-speed rotation terminal 5a. Similarly, when the changeover switch 6 is switched to the terminal 6d, it is connected to the low speed rotation terminal 5b connected to the low speed rotation control section of the fan motor 7, and the air cleaner 5 operates weakly.

Next, when the selector switch 6 is switched to the terminal 6b, the connection is as shown in FIG. 3. In other words, the output detected by the smoke detector 2 in the same manner as in the conventional example is input to the delay circuit 3, and in the delay circuit 3, when the output of the smoke detector 2 rises as shown in part A of FIG. The output will rise after t seconds. Further, when the output of the smoke detection section 2 in the section A falls, the output is reduced after T seconds. Part B of the figure shows a whisker-like pulse wave output from the smoke detection section 2 due to transient noise or the like. In this case, if the pulse width is less than t seconds, the delay circuit 3
is not output to the output. In addition, the figure C shows a smoke detection unit when the amount of smoke increases or decreases, such that smoke repeatedly appears and disappears, or the converted voltage of the smoke sensor of the smoke detector 2 repeatedly generates a voltage near the upper and lower sides of the reference voltage. This is the output waveform of No. 2. The air purifier 5 starts when the output of the first smoke detector 2 rises, the output of the smoke detector 2 falls, and when the next rise occurs within T seconds, the output of the delay circuit 3 is It continues to output the voltage that keeps the air cleaner 5 operating. Therefore,
As long as the repetition of the rise and fall of the voltage of the output of the smoke detector 2 does not occur for a time interval of T seconds or more, the output of the delay circuit 3 continues to output a voltage that continues to operate the air purifier 5, Only after the above time interval has elapsed does the voltage show a fall and the air cleaner 5 is stopped.

Here, t is 1 so as not to react to transient noise.
T is set to about 1 to 2 minutes to prevent repetition of short-term starting and stopping. This makes it possible to realize starting and stopping conditions that are compatible with human senses.

〔Effect of the invention〕

In the present invention, since the automatic control circuit is equipped with a delay circuit that delays the rise of the output of the smoke detection section by a certain period of time and outputs it to the output section, the transient pulse width that is less than the predetermined delay time set by the delay circuit The air purifier can operate stably without starting due to noise, etc. The delay circuit also has the function of delaying the fall of the output of the smoke detection section by a certain period of time and outputting it to the output section, so it is compatible with cases where smoke repeatedly appears and disappears or where the detection value of the smoke detection section goes up or down. When the amount of smoke increases or decreases, the air purifier can continue to operate without being affected by the repetition of new rises in the smoke detection section within a predetermined delay time set by the delay circuit. This prevents the air purifier from repeatedly starting and stopping within a short period of time. Therefore, there is an effect that the air cleaner can be controlled to start and stop in a way that is compatible with the senses of the human body without causing any discomfort to the human body. Furthermore, the smoke detector is placed on the ceiling near the room lamp inside the vehicle, so smoke can be detected as quickly as possible, and the switch is placed near the driver's seat for easy operation and air purification. Since the machine is placed in the rear package tray, the remaining space can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of how the embodiment of the present invention is installed in a car;
2 is a wiring diagram of the same as above, FIG. 3 is a block diagram of the main part of the same as above, FIG. 4 is an explanatory diagram of the operation of FIG. 3, and FIG. 5 is a block diagram of the main part of the conventional example. 1 is an automatic control circuit, 2 is a smoke detection unit, 3 is a delay circuit, 4 is an output unit, 5 is an air purifier, 6 is a changeover switch, 9 is a car, 10 is a driver's seat, 11 is a rear package tray, 12 is a It is a room lamp.

Claims (1)

[Claims] 1. An automatic control circuit having a smoke detection section disposed on a ceiling surface near a room lamp in a vehicle interior, and an output section that starts and stops an air purifier disposed in a rear package tray according to the output of the smoke detection section; a changeover switch disposed near the driver's seat for switching the operation control of the air purifier between automatic control by the automatic control circuit and manual control; and a switch for controlling the rise and fall of the output of the smoke detector in the automatic control circuit, respectively. A vehicle-mounted air purifying device comprising a delay circuit that outputs the output to an output section after a certain period of time delay.