JPH0212082Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to the structure of a vehicle interior gas detection device used in an automobile air conditioner.

(Prior art) Conventionally, as this type of device, for example,
As shown in Publication No. 107051, a system in which a gas sensor is installed at an appropriate location in the vehicle interior to detect harmful gases in the vehicle interior, and this detection signal is used to operate an air purification device has become publicly known. ing.

In this case, some gas sensors have detection characteristics that change depending on the ambient temperature, and in order to solve this problem, it is difficult for those skilled in the art to provide a dedicated temperature sensor near the gas sensor and temperature-correct the characteristics of the gas sensor. In the past, it would be extremely easy to think of this.

(Problems to be solved by the invention) However, in the conventional example described above, a temperature sensor dedicated to the gas sensor is required, which not only increases costs but also increases the trouble of wiring work. .

Therefore, the object of this invention is to provide a vehicle interior gas detection device for an automobile air conditioner that does not require a dedicated temperature sensor.

(Means for solving the problem) However, the gist of this invention is that the air duct connecting the vehicle interior and the aspirator,
A vehicle air conditioner comprising: a vehicle interior temperature detection means provided in the duct to detect the temperature of the air in the vehicle interior; and a gas detection means provided near the vehicle interior temperature detection means to detect a gas body. It is located in the vehicle interior gas detection device.

(Function) Therefore, the vehicle interior temperature detection means that detects the temperature of the air in the vehicle interior simultaneously detects the ambient temperature of the gas detection means, and the detected temperature is used for temperature correction of the gas detection means. Therefore, the above problem can be achieved.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an air duct, one end of which opens into an instrument panel 3 within a passenger compartment 2, and the other end connected to an aspirator (not shown). A temperature sensor 4 made of, for example, a thermistor is provided in the middle of the air duct 1, and its output line 5 is connected to a grommet 6 attached to the wall of the air duct 1.
It is connected to a control circuit (not shown) via.
A gas sensor 7 is attached to the wall surface of the air duct 1 near the temperature sensor 4. The gas sensor 7 is made of, for example, a metal oxide, and is a known semiconductor type sensor that utilizes changes in electrical conductivity due to gas adsorption/desorption phenomena occurring on the surface of the metal oxide. The output signal is then input to a control circuit (not shown).

In the above configuration, air within the vehicle compartment 2 is guided to an aspirator (not shown) via the air duct 1. The temperature sensor 4 detects the temperature of the air inside the vehicle compartment 2 flowing through the air duct 1 and outputs it to an external control circuit (not shown).

On the other hand, when gas is detected from the air inside the vehicle compartment 2 flowing through the air duct 1, the gas sensor 7 transmits a detection signal to the external control circuit (not shown).
Output to.

In an external control circuit (not shown), the temperature detected by the temperature sensor 4 is used for conventional air conditioning control, and at the same time is used for temperature correction of the gas sensor 7 as the ambient temperature of the gas sensor 7.

(Effects of the invention) As described above, according to this invention, the gas detection means is provided near the passenger compartment temperature detection means for detecting the temperature of the air in the passenger compartment. There is no need to provide a temperature detection means, which reduces costs and saves time and effort in wiring work.

Furthermore, since the air inside the vehicle is reliably guided to the gas detection means, gas detection becomes easy and reliable. Furthermore, since the cabin temperature detection means that detects the temperature inside the cabin is usually more accurate and responsive than those used for temperature correction, the accuracy and responsiveness of the gas sensor's temperature correction is also improved. It is effective.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the vehicle interior gas detection device according to this invention. 1... Air duct, 4... Temperature sensor, 7...
gas sensor.

Claims (1)

[Scope of utility model registration request] an air duct that connects the vehicle interior and the aspirator; a vehicle interior temperature detection means provided within the duct for detecting the temperature of the air in the vehicle interior; 1. A vehicle interior gas detection device for an automobile air conditioner, characterized by comprising gas detection means for detecting gas.