JP2590579Y2 - Sensor Arrangement Structure in Vehicle Pollution Detection Device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pollution detecting device for a vehicle, and more particularly to a simplification of a sensor arrangement in the pollution detecting device for a vehicle.

[0002]

2. Description of the Related Art In order to purify air in a vehicle, odors inside and outside the vehicle are detected, and a stationary type air purifier is operated or an intake damper of a vehicle air conditioner is operated in accordance with the detection result. Control such as switching is performed conventionally. By the way, in such air-conditioning control, the location of a sensor for detecting odor is important, but it is usual that the sensor is individually installed in accordance with the type of odor to be detected.

[0003] That is, for example, in the case where the odor of tobacco or the like in the vehicle compartment is targeted, a sensor for detecting the odor is used, for example, when a ceiling in the vehicle compartment or a stationary air cleaner is used. It is generally arranged in the rear parcel or in the main passage of the air conditioner. Further, for example, in the case of targeting gasoline and diesel exhaust gas outside the vehicle, the sensor for detecting the odor is disposed at the outside air intake of the air conditioner or at a position in front of the radiator. It is common (for example,
0-100750).

[0004]

However, in the above-mentioned conventional example, since a sensor is basically provided according to the type of odor, when air cleaning for a plurality of odors is performed, the Sensors are required in accordance with the type of the device, which not only requires an expensive device, but also necessitates securing an appropriate installation location for each sensor.
Therefore, there has been a problem that the structure is complicated.

The present invention has been made in view of the above-mentioned circumstances, and provides a sensor arrangement structure in a vehicle pollution detection device which can detect a plurality of odors with a simple structure.

[0006]

According to the present invention, a sensor arrangement in a vehicle pollution detecting device according to the present invention is an aspirator configured to inhale air in a vehicle compartment and exhaust air to the outside of the vehicle compartment. An aspirator having a branch communicating with the main flow path of the vehicle air conditioner is provided with an odor sensor capable of detecting different odors at a position downstream of the branch.

[0007]

The air in the passenger compartment and the air in the vehicle air conditioner are located downstream of the aspirator provided with a branch communicating with the main flow path of the vehicle air conditioner and downstream of the branch. And the odor sensor will be exposed to this flow. Therefore, when the vehicle air conditioner is in the so-called inside air circulation mode, the odor sensor is exposed only to the air in the vehicle interior, so that a specific odor contained in the vehicle interior air can be detected. In the so-called outside air introduction mode, the odor sensor is exposed to the outside air, so that a specific odor contained in the outside air can be detected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sensor arrangement structure of a vehicle pollution detecting device according to the present invention will be described with reference to FIG. still,
The members, arrangements, and the like described below do not limit the present invention, but can be variously modified within the scope of the present invention.

First, the sensor arrangement structure of the vehicle pollution detecting device according to the present invention utilizes the structure of an aspirator which is a part of a vehicle air conditioner, and FIG. 1 shows the structure. In FIG. 1, an introduction part 2 of an aspirator 1 is shown.
Is usually mounted so that its opening 2a is opened in an instrument panel (not shown). Inside the introduction part 2, a temperature sensor and an aspirator fan (neither is shown) Is stored. When power is supplied to the aspirator fan from the outside via the socket 3, the aspirator fan operates and air in the vehicle compartment is sucked from the opening 2a,
The temperature of the vehicle interior air is detected by a temperature sensor.

[0010] One end of an aspirator duct 4 is connected to the rear end of the introduction section 2 of the aspirator 1 so that the air in the passenger compartment introduced from the introduction section 2 is guided. The other end of the aspirator duct 4 is branched into two branches, and one branch portion 5 a is fitted into a connection hole formed in the heater case 6 and communicates with the inside of the heater case 6. Further, the other branch portion 5b is
The extending portion 4a formed in a cylindrical shape is connected to the extending portion 4a.
The opening 7a is disposed so as to open at a position facing the outside of the vehicle or into the engine room.

Guide pieces 8a and 8b are provided inside the bifurcated portion of the aspirator duct 4 described above. That is, the guide pieces 8a, 8b
Is formed so as to protrude from a portion immediately before the aspirator duct 4 branches into two branches, and extends toward the other branch portion 5b. Among these, one guide piece 8b extends to the other branch 5b side so as to cross the opening 7b at the part where the one branch 5a branches, whereby the air flowing in from the one branch 5a. (Refer to the solid line arrow in FIG. 1). The extending portion 4a extends through the other branch portion 5b.
Is to be led to.

The heater case 6 houses a heater core (not shown) used for a vehicle air conditioner (not shown). The heater case 6 is provided in a main flow path (not shown) of the vehicle air conditioner. When the vehicle air conditioner is in the so-called outside air introduction mode via the heater case 6, the air outside the vehicle is connected to the one branch portion 5 a via the heater case 6. , The air in the vehicle compartment is introduced and flows into the other branch portion 5b.

An odor sensor 9 is provided at an appropriate portion of the extension 4a following the other branch 5b. The odor sensor 9 is, for example, an odor identification sensor made of a metal oxide semiconductor having a plurality of different gas-sensitive characteristics. Specifically, a sensor having high sensitivity to nitrogen-based odor, hydrogen sulfide-based odor, hydrocarbon-based odor, alcohol-based odor (volatile odor), etc. using a sintered body sensor of SnO2 and ZnO and a thin film sensor is used. Use one that is integrated and has an enhanced identification function.

The odor sensor 9 of this embodiment is capable of detecting four types of diesel exhaust gas, gasoline exhaust gas, tobacco odor, and odor of fragrance. The identification method is
The characteristics of each sensor for the above four basic odors (diesel exhaust gas, gasoline exhaust gas, tobacco odor, and odor of fragrance) are stored, and it is determined whether the measured value of the unknown odor is close to the basic odor. To be identified by The output terminal of the odor sensor 9 is connected to a vehicle pollution detecting device (not shown), and the detection signal is used for the operation of the vehicle pollution detecting device.

In the above configuration, first, when the vehicle air conditioner is operating in a so-called inside air circulation mode, when the aspirator fan is operated by an operation switch (not shown), the air in the vehicle compartment is sucked from the introduction portion 2. , Through the aspirator duct 4 and the other branch 5
b (see the white arrow in FIG. 1). On the other hand, the vehicle interior air is also introduced into one branch portion 5a via the heater case 6 (see the solid line arrow in FIG. 1). As a result, the odor sensor 9 is exposed to the cabin air flowing out of the two branch portions 5a and 5b. Therefore, from the odor sensor 9, for example, when the air in the vehicle compartment contains a tobacco odor, a detection signal corresponding to the detection of the tobacco odor is also output from the odor sensor 9. If an odor is included, a detection signal corresponding to the detection of the fragrance is output.

On the other hand, when the vehicle air conditioner is in a so-called outside air introduction mode, the air in the passenger compartment is sucked from the introduction portion 2 and passes through the other branch portion 5b to the extension portion 4a and from the heater case 6 to the extension portion 4a. The outside air is introduced into the extending portion 4a through the one branch portion 5a, and the odor sensor 9 is exposed to the flow of the gas mixed with the air from the branch portions 5a and 5b. Therefore, if the exhaust gas of the diesel engine or the engine is included in the outside air, it is detected by the odor sensor 9, and the odor sensor 9 outputs a predetermined detection signal.

As described above, since a signal corresponding to the detected odor is output from one odor sensor 9, appropriate air-conditioning control can be performed based on the detected signal. That is, when the odor sensor 9 detects a tobacco odor, the air cleaner installed in the vehicle compartment is operated, or the intake door of the vehicle air conditioner is in the inside air circulation position simultaneously with the operation of the air cleaner. in case of,
Control such as switching to outside air introduction can be performed via the vehicle contamination detection device. When the odor sensor 9 detects a diesel or gasoline odor,
It is possible to output a control signal from the vehicle pollution detection device to the vehicle air conditioner, and to execute control such as setting the intake door to the inside air circulation position.

In this embodiment, the odor sensor 9 can detect a diesel odor, a gasoline odor, a tobacco odor, and an odor of a fragrance, respectively. However, these are only examples, and are not limited to these odors. Needless to say, other odors may be detected and air conditioning control may be performed according to the odors. Further, the odor sensor 9 in this embodiment is a so-called composite sensor capable of detecting a plurality of odors, but may be a single sensor for detecting a single odor.

[0019]

As described above, according to the present invention, it is possible to monitor the air in both the vehicle interior and the outside of the vehicle with a single sensor without installing sensors at a plurality of locations. Therefore, since it is only necessary to install one odor sensor in one place, unlike the conventional case, a dedicated sensor for monitoring the air in the vehicle interior, or to detect exhaust gas when the vehicle air conditioner has an automatic damper It is not necessary to provide a plurality of sensors such as the above-mentioned sensors, and it is not necessary to provide an appropriate mounting portion for each sensor. Therefore, it is possible to reduce the cost and to achieve a simple structure by saving space. Things.

[Brief description of the drawings]

FIG. 1 is a configuration diagram including a partial cross-sectional view showing one embodiment of a sensor arrangement structure in a vehicle pollution detection device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Aspirator, 2 ... Introduction part, 4 ... Aspirator duct, 4a ... Extension part, 5a ... One branch part,
5b: the other branch portion; 8a, 8b: guide piece; 9: odor sensor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60H 3/00 G01N 27/00

Claims (1)

(57) [Scope of request for utility model registration] 1. An aspirator configured to inhale air in a vehicle compartment and exhaust air out of the vehicle compartment in a sensor arrangement structure in a vehicle pollution detection device that performs air conditioning control according to a detection result of an odor sensor. , Introduction part of the aspirator
The opening of the instrument panel
At the rear end side of the introduction part of the aspirator,
One end of the vehicle is connected, and the cabin introduced from the introduction section
The inside air is guided, and the other end of the aspirator duct is bifurcated.
And one branch communicates with the main flow path of the vehicle air conditioner.
To the connection hole formed in the heater case
The branching part is connected to a tubular extension,
The opening of the extension is located outside the car or in the engine compartment.
The aspirator duct is disposed so as to open to the
Is provided with two guide pieces extending to the other branch part side
And one of the guide pieces is the one
Across the opening at the point where the fork branches off
Extends to the other branch and flows from the one branch
The site of the downstream air of the other branch portion of Asupireta made so as to be guided to the other branch portion, double
A sensor arrangement structure in a pollution detection device for a vehicle, wherein an odor sensor capable of detecting a number of odors is arranged.