JPH0620649Y2 - Car ventilation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a ventilation device for an automobile having an outside air pollution detection sensor. INDUSTRIAL APPLICABILITY The present invention can be applied to an automobile air conditioner or the like that requires a high outside air pollution detection capability under any traveling condition.

[Prior Art] The air conditioner disclosed in Japanese Patent Laid-Open No. 58125/1983 has an outside air pollution sensor for detecting the pollution degree of outdoor air, and the detected outside air pollution degree is below a preset value. Only at this time is the intake operation operation, that is, the operation operation of sucking the outside air into the room.

Further, in the conventional air-conditioning detection type air conditioner used for automobiles, the air-conditioning sensor is installed at a site such as an air-introducing port of the air-conditioning system or the front surface of the radiator which is easily contacted with air.

[Problems that need to be solved] However, in the conventional arrangement method of the outside air pollution sensor in which the outside air pollution sensor is installed at the outside air introduction port of the air conditioner, the contaminated outside air is already sucked into the vehicle when the outside air is detected. was there.

Also, in the conventional outside air pollution sensor installation method in which the outside air pollution sensor is installed on the front surface of the radiator, the amount of outside air introduced to the outside air pollution sensor is reduced when the vehicle is stopped, running backwards, or traveling at low speed, which delays the detection of outside air pollution. Or, it could not be detected, and the contaminated outside air sometimes entered the room.

SUMMARY OF THE INVENTION The present invention has been made to improve the above-mentioned drawbacks, and an object of the present invention is to provide a ventilation device for a vehicle that can detect outside air pollution more quickly and more reliably.

[Means for Solving the Problems] The device of the present invention switches a box body having an inside air suction port for sucking air inside the vehicle compartment and an outside air suction port for sucking air outside the vehicle cabin, and the inside and outside air suction port. An inside / outside air switching device having a damper and a driving device for driving the damper, an outside air pollution sensor for detecting a pollution concentration of outside air, and a control device for controlling the operation of the driving device according to an output signal value of the outside air pollution sensor. In an automotive ventilation system comprising, the above-mentioned outside air pollution sensor is an automotive ventilation system characterized by being installed in an intake duct system for introducing combustion air into an engine of an automobile through an air cleaner. is there.

[Operation] Since the automobile ventilation device of the present invention has the outside air pollution sensor installed in the intake duct system for the engine, the outside air pollution sensor promptly detects the outside air pollution as long as the engine is rotating, and the control device is provided with the outside air pollution sensor. Output the outside air pollution signal. Then, the control device determines the received output signal level of the outside air pollution sensor and adjusts the outside air intake flow rate of the inside / outside air switching device. That is,
A drive device (actuator) of the inside / outside air switching device rotates the inside / outside air switching damper to reduce or block the intake outside air flow rate when the outside air pollution concentration is high.

[Effects] The vehicle ventilation device of the present invention comprises an outside air pollution sensor having an outside air pollution sensor installed in the intake duct system of the engine, and an inside air / outside air switching device whose outside air intake flow rate is controlled by the outside air pollution sensor. Therefore, if the engine is rotating, the outside air pollution concentration can be promptly detected even when the vehicle is stopped, the vehicle is traveling backward, or the vehicle is traveling at a low speed. Therefore, even if the outside air is suddenly polluted, it is possible to reduce or stop the intake of the outside air into the room without delay. Of course, even when the engine is stopped, the outside air pollution can be detected as in the conventional device.

Further, since the automobile ventilation device of the present invention can be installed in the duct, the duct area can be narrowed at the portion where the outside air pollution sensor is installed, and the outside air flow velocity in contact with the outside air pollution sensor can be improved.

Even if an outside air pollution sensor is installed in the front or rear of the radiator, the outside air velocity can be improved, but the improvement rate of the flow rate is not so large, and when the radiator is cold, the radiator fan does not rotate and the flow rate improves. Not done.

[Embodiment] FIG. 3 shows a schematic cross-sectional view of an automobile air conditioner having an automobile ventilation device of this embodiment.

This vehicle ventilation device includes an inside / outside air switching device 11 and a control device 13 for controlling an outside air intake amount of the inside / outside air switching device 11.
And an outside air pollution sensor 12 that outputs a signal related to the detected outside air pollution (outside air pollution signal) to the control device 13.

The inside / outside air switching device 11 includes an outside air inlet 16 and an inside air inlet 1.
7, a box body 20 having 7 and an outlet 14, and an intake fan 15
The intake door 18, a negative pressure actuator 19 for driving the intake door 18, and a solenoid valve 10 for operating the negative pressure actuator 19 are provided.

The outside air pollution sensor 12 has a gas sensor that detects the concentration of harmful gases such as CO and NOx and a dust sensor that detects the dust concentration, is installed inside the engine intake duct system 21, and is controlled by the signal line 20 to a control device. It is connected to 13.

The operation of the automobile ventilation device will be described below.

When the engine of the automobile is rotating, the intake duct system 21 of the engine always introduces the outside air of a certain value or more, and the outside air pollution sensor controls the outside air pollution signal in response to the change of the pollution concentration of the inflowing outside air. It is output to the device 13.

The controller 13 compares the input outside air pollution signal with a predetermined set value stored in advance, and outputs the outside air intake prohibition signal to the solenoid valve 10 only when the outside air pollution signal is larger than the set value.

The inside / outside air switching device 11 sends either indoor air (inside air) sucked from the inside air suction port 17 or outside air sucked from the outside air suction port 16 to the inside of the room from an outlet 14 by an intake fan 15.

The solenoid valve 10 operates the negative pressure actuator 19 by the input of the outside air inflow prohibition signal to rotate the intake door 18 to the outside air intake port 16 side, shuts off the inflow of outside air, and the inside air (inside air) from the inside air intake port side. Inflow.

When the pollution concentration of the outside air flowing into the engine intake duct system 21 becomes lower than the set value, the control device 13 sends an outside air inflow permission signal, which is a signal opposite to the above outside air inflow signal, to the solenoid valve 10.
Then, the solenoid valve 10 rotates the negative pressure actuator 19 in the opposite direction to the front to block the inflow of the inside air and allow the outside air to flow in.

The negative pressure actuator 19 is an air cylinder driven by negative pressure.

Therefore, according to the above-described embodiment, it is possible to detect the change in the outside air concentration quickly and reliably even during idling, low speed traveling, and reverse traveling.

Another arrangement row of the outside air pollution sensor is shown in FIGS. 1 and 2.

FIG. 1 is a schematic sectional view showing the engine intake duct system 5, and FIG. 2 is an actual layout of the engine intake duct system 5. In this embodiment, the engine intake duct system 5 has a sensor duct 2 upstream of the air cleaner 3, and an outside air pollution sensor 1 is installed at an intake port 7 of the sensor duct 2. Therefore, the intake duct system 5 sucks the outside air from both the original intake port 6 and the added intake port 7. Further, the sucked outside air is purified by an air cleaner and then sucked into the cylinder by driving the engine 4.

The sensor duct 2 is formed integrally with the intake duct system 5 and has an intake port shape surrounding the outside air pollution sensor,
The outside air is configured to come into good contact with the outside air pollution sensor. As shown in FIG. 2, the sensor duct 2 is extended so that its intake port 7 has a front grill 8 of the automobile.
And a radiator (not shown) behind it. Therefore, outside air pollution can be detected more quickly.

In the present invention, the outside air pollution sensor may be installed behind the air cleaner 3. For example, if a gas sensor or the like is installed behind the air cleaner 3, it is possible to reduce dust pollution of the gas sensor. However, it is preferable that the dust sensor be installed in front of the acre cleaner. If the sensor duct 2 can be separated from the intake duct system 5, the duct can be easily cleaned.

Further, although the intake door 18 is binary-controlled in the above embodiment, it is naturally possible to proportionally control the intake door 18 within a predetermined outside air pollution concentration range instead.

Further, in the above-mentioned embodiment, the outside air suction device is a switching device for switching between inside and outside air, but it may be a device for controlling the flow rate of outside air.

Further, there is a problem that the intake door 18 blocks or reduces the inflow of outside air for a long time due to a malfunction of the outside air pollution sensor,
Outside air pollution is above the set value for a long time and intake door 18
In order to ameliorate the problem that the outside air inflow is blocked or reduced for a long period of time, the intake door 18 may be used after the outside air inflow is blocked or throttled for a certain time (for example, 30 minutes or more).
Intake door 1 for a certain period of time (for example, 3 minutes or more)
It is also possible to rotate 8 to make an emergency inflow of outside air. or,
In the intake door forced rotation operation, the outside air emergency intake time or the intake door opening can be adjusted according to the detected outside air pollution concentration. By doing so, it is possible to prevent the deterioration of the indoor air due to the blocking of the outside air inflow for a long time.

The partial structures, materials, and the like of the above-described embodiments can be changed without departing from the gist of the present invention. Further, the present invention is not limited to the above-mentioned embodiment, and can be modified according to the purpose and application.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of the arrangement of the outside air pollution sensor of the present invention. FIG. 2 is a schematic sectional view showing the arrangement of the intake duct system 5 of FIG. FIG. 3 is a block diagram of an embodiment of a vehicle ventilation device of the present invention. 11 ... Inside / outside air switching device 12 ... Outside air pollution sensor 13 ... Control device 16 ... Outside air intake port 17 ... Inside air intake port 18 ... Intake door (damper) 19 ... Negative pressure actuator (drive device) 21 ... Engine intake duct

Claims (2)

[Scope of utility model registration request] 1. A box body having an inside air inlet for sucking air inside the vehicle compartment and an outside air inlet for sucking air outside the vehicle compartment, a damper for switching the inside and outside air inlet, and a drive device for driving the damper. An inside / outside air switching device having, an outside air pollution sensor for detecting a pollution concentration of outside air, and a control device for controlling the operation of the drive device by an output signal value of the outside air pollution sensor, The above-mentioned outside air pollution sensor is installed in an air intake duct system for introducing combustion air into an engine of an automobile through an air cleaner. 2. The ventilation system for an automobile according to claim 1, wherein the outside air pollution sensor is installed upstream of the air cleaner.