JPS59100011A - Smoke sensor in air-conditioner for automobile - Google Patents

Abstract

PURPOSE:To enhance the response, with respect to smoke, of an automobile air conditioner in which an inside atmospheric temperature sensing element is disposed in an air passage, by disposing, in the air-passage, a photo-electric type smoke sensor encased in an opaque casing. CONSTITUTION:A smoke sensor 3 is disposed between hoses 2a, 2b constituting an air passage connecting an inside atmospheric temperature sensor 1 and a blower 4. With this arrangement, since air in the inside of a vehicle passenger compartment is forced to flow through the smoke sensor 3, the generation of smoke may be promptly detected, and as well, since the light is very simply shielded by bending the hoses 2a, 2b, the sensitivity and accuracy of the smoke sensor may be enhanced. Thus, the responsiveness of the air-conditioner may be enhanced.

Description

[Detailed description of the invention] The present invention relates to a smoke sensor for an automotive air conditioner.

Conventionally, the sensor that detects the amount of smoke (amount of powdered gin) inside the vehicle is
Normally, the method is to install it on the ceiling of the vehicle cabin, focusing on the fact that smoke rises upwards, but in reality, the time it takes for smoke to reach the sensor from the temperature of a passenger starting to smoke (°C) is common. For example, when you want to detect the amount of smoke and activate an air purifier, it feels like it takes a long time to operate.

The present invention has been made in view of the above-mentioned problems, and in an automotive air conditioner that automatically controls the room temperature of a vehicle, the temperature sensing element of the interior temperature sensor that detects the interior temperature of the vehicle is connected to the air passage through which the interior air is forcedly ventilated. By installing a photoelectric smoke sensor in the middle of this air passage, the existing structure of the automotive air conditioner can be effectively used to prevent smoke generation. The purpose is to provide a smoke sensor with good response.

The present invention will be explained below according to the illustrated embodiments.

Figure 1 shows the entire system including the sensor of the present invention. 1 is an internal temperature sensor that outputs a signal to control the temperature of an automobile air conditioner; inside it is a thermistor as shown in Figure 2. It has a temperature sensing element 1a, and the air inside the vehicle is taken in through an air intake port 1b. IC is a lead wire of the temperature sensing element 1a, 2a and 2b are hoses forming air passages, and are made of a flexible material such as rubber.
is set up. Reference numeral 4 denotes a blower, which is configured to drive a centrifugal fan 4b by a motor 4a. The internal temperature sensor 1, the hoses 2a and 2b, the smoke sensor 3, and the blower 4 are airtightly connected to each other so as to form a series of air passages. Therefore, the air inside the vehicle is the intake 1 of the inside temperature sensor 1.
1b, passes through the hose 2a, the smoke sensor ν・3, and the hose 2b, and is blown out from the fan 4b of the blower 4 into the vehicle interior.

5 is a control circuit that amplifies the electrical signal from the smoke sensor 3;
By comparing with the standard signal, an electrical signal corresponding to the presence or absence of smoke is output. Reference numeral 6 denotes a relay driven by the output of the control circuit 5, which turns on and off the power to the air purifier 7 installed in the passenger compartment of the automobile. That is, when the control circuit 5 determines the presence of smoke and outputs an electric signal, the relay 6 is turned on and the air purifier 7 is automatically activated.

FIG. 3 shows an example of the installation position of the smoke sensor of the present invention in the vehicle interior, and the Δ section is the first example, in which the inside temperature sensor 1 and port 2a are installed in the instrument panel 10 at the front of the vehicle interior. , 2b
, a smoke sensor 3, and a blower 4. The intake port 1b of the internal temperature sensor 1 is open on the top surface of the instrument panel 10. B has each of the above devices 1.2 in the console box 11.
This is a second example in which the air temperature sensor 1a, 2b, and 3.degree.

12 is a control panel of the air conditioner, 13 is a solar radiation sensor, and 6 Figure 4 (a+, (bl) shows details of the smoke sensor 3 part. Cases 31 and 32 are made of an opaque material, for example, a suitable opaque resin. By joining these two cases 31 and 32 together by adhesive or the like, one cylindrical case is formed, and the inside of the case is blocked from light from the outside.A pedestal 33 is attached to the inner surface of one case 32. is molded, and this pedestal 33 is provided with a lead wire through hole 34 and a bottle 35 for v+ tightening.The light emitting element 36 and the light receiving element 37 are held and fixed in one common resin mounting body 38. The attachment body 38 is attached to the inner surface of the case 32 by passing the bottle 35 through the attachment hole 39 and heat-squeezing it.

In the light-shielded air passage formed by the cases 31 and 32, the light emitting element 36 and the light receiving element 37 are connected to each other.
The light from the light emitting element 36 is arranged so that it does not directly enter the light receiving element 37, and if smoke enters the air passage, the light from the light emitting element 36 will be reflected by the smoke and reach the light receiving element 37. ing. Therefore, the magnitude of the electric signal generated at the light receiving element 37 corresponds to the 31 degree angle of the smoke.

Note that both ends of the cases 31 and 32 are formed thin so that the hoses 2a and 2b can be easily fitted.

On the other hand, the blower motor 4a is designed to operate not only when the air conditioner is operated but also when the operation switch of the air purifier 7 is turned on to auto mode.

In other words, the remote motor 4a is driven by the OR circuit output of the air conditioner operating switch and the air purifier operating switch.

According to the above configuration, since the interior air of the vehicle is forced through the inside of the smoke sensor 3, it is possible to quickly detect the occurrence of smoke with good response. Moreover, the air passage inside the smoke sensor 3 can be blocked from light from the outside very easily by bending the hoses 2a and 2b.

Therefore, by reducing the photocurrent caused by the disturbance light in the light receiving element 37 and increasing the sensor S/N ratio, detection accuracy can also be improved.

FIG. 5 shows another embodiment in which the blower 4 and the inside temperature sensor 1 are integrated, and the temperature sensing element 1a of the inside temperature sensor 1 is installed immediately upstream of the fan 4b. . Therefore, the smoke sensor 3 is located upstream of the internal temperature sensor 1. Reference numeral 8 denotes a cabin air intake cylinder.

Further, the motor 4a of the blower 4 may be operated in conjunction with the drawer operation of the cigarette lighter, the operation of the cigarette lighter, and the like.

Further, the detection signal of the smoke sensor 3 may be used to control the operation of an internal/external air switching/introducing device of an air conditioner and an opening/closing damper device of a ventilation opening.

Furthermore, the present invention can be similarly implemented in a system in which the inside temperature sensor 1 is ventilated at a strong 11+11 level by an aspirator using air blown by an air conditioning phase blower without using the motor-driven blower 4.

As described above, according to the present invention, the responsiveness of smoke detection by the internal temperature sensor can be improved.

Further, by simply bending the air passage after the smoke sensor Ail, the inside of the smoke sensor can be shielded from light extremely easily, and the detection can be improved by 171 degrees.

[Brief explanation of drawings]

Fig. 1 is an overall system diagram illustrating the usage form of the smoke sensor of the present invention, Fig. 2 is a front view of the inside temperature sensor of Fig. 1, and Fig. 3
The figure is a perspective view of the assembly panel illustrating the installation position of the smoke sensor of the present invention in the vehicle interior, Figure 4 (+1) is an exploded perspective view of the smoke sensor of the present invention, Figure 4 tb) is Figure 4 (al Fig. 5 is a sectional view of another embodiment of the present invention.■...Internal temperature sensor, la...Temperature sensing element, 2a, 2
b...Air passage hose, 3...Smoke sensor, 4
...Blower, 31.32...Case, 36...Light emitting element. 37... Light receiving element. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] In an automobile air conditioner in which a temperature-sensing element of an inside temperature sensor for detecting the temperature inside a vehicle is installed in an air passage through which the air inside the vehicle is forcedly ventilated, a case made of an opaque material is provided in the middle of the air passage; A smoke sensor for an automobile air conditioner, which includes a light emitting element and a light receiving element in a case, and generates an electric signal to the light receiving element according to the presence or absence of smoke in an optical path between the pixel elements.