JPH0525285Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a temperature detection device for an air conditioner for an automobile, and particularly for accurately detecting the temperature of the air inside the vehicle at the initial stage of starting the vehicle. Regarding what can be done.

(Prior Art) Generally, in the case of an automatic air conditioner that maintains the temperature inside the vehicle at the temperature set by the passenger based on the detected values of various sensors installed inside and outside the vehicle, An indoor air sensor is installed to detect the temperature of the indoor air.

This internal air sensor is installed, for example, inside the aspirator 3 shown in FIG.
is attached, for example, to a substantially central portion of an instrument panel 2 disposed at the front of the interior of the vehicle 1.

FIG. 6 shows a longitudinal cross-sectional view of the aspirator 3. FIG. As shown in the figure, inside the duct 3A of the aspirator 3, an inside air sensor 4 is arranged near the air intake port 5 of the duct 3A, and at the rear of the duct 3A, the inside air is introduced into the duct 3A. An aspirator fan 6 is provided. This aspirator fan 6 is a fan motor 7
driven by. Therefore, when the fan motor 7 is rotating, cabin air is sucked into the duct 3A by the rotation of the aspirator fan 6, and the inside air sensor 4 is always exposed to air having an average temperature inside the cabin. Therefore, the inside air sensor 4 detects accurate vehicle interior air temperature as information for air conditioning control.

Further, the specific structure of the aspirator duct 3A is shown in, for example, Japanese Utility Model Publication No. 1988-2011, and is intended to ensure accuracy of the temperature detected by the inside air sensor 4.

(Problem to be solved by the invention) However, in such conventional technology, the aspirator fan motor 7 is designed to operate only when the air conditioner is in operation, that is, when the vehicle interior is in an air-conditioned state. Therefore, if the air conditioner is activated at the beginning of the vehicle startup, there is a risk that the temperature of the air inside the vehicle cannot be accurately detected at the beginning of startup.

Specifically, for example, when the vehicle is parked in the hot sun for a long time, the temperature of the air inside the vehicle increases considerably, and the instrument panel 2 is also heated by direct sunlight, so the aspirator duct 3A itself is heated to a temperature higher than that of the air inside the vehicle.
Therefore, the temperature of the inside air sensor 4 itself is heated to a temperature higher than that of the air inside the vehicle, and the inside air temperature input from the inside air sensor 4 to the air conditioner control device at the same time as the vehicle is started tends to be inaccurate. ,
This may adversely affect the accuracy of air conditioning control.

The present invention has been made in view of the problems of the prior art, and provides a temperature detection device for an automotive air conditioner that can accurately detect the air temperature inside the vehicle even in the early stages of starting the vehicle. The purpose is to

[Structure of the invention] (Means for solving the problem) The present invention to achieve the above object consists of an aspirator attached to an instrument panel in a vehicle interior, and an air filter installed in a duct of the aspirator to control the air inside the vehicle. an inside air sensor that detects the temperature of the interior air sensor, a blower disposed in the duct that blows air inside the vehicle toward the inside air sensor, a solar radiation sensor that detects the amount of solar radiation, and a solar radiation sensor that outputs electric power according to the amount of solar radiation. It is characterized by comprising a battery and a control means for supplying electric power from the solar cell to the air blowing means when the amount of solar radiation detected by the solar radiation sensor is equal to or higher than a predetermined value.

(Function) In the present invention configured as described above, even when the vehicle is left unattended, the control means controls the power from the solar cells when the amount of solar radiation detected by the solar radiation sensor exceeds a predetermined value. Supplies the air blowing means. As a result, the blower blows air inside the vehicle toward the inside air sensor disposed within the duct of the aspirator. Therefore, even if the instrument panel becomes hot due to sunlight, the aspirator duct and the inside air sensor are cooled by the air, and the inside air sensor is always maintained at the same temperature as the air inside the vehicle. It turns out. Therefore, the inside air sensor can accurately detect the temperature of the air inside the vehicle even at the initial stage of starting the vehicle.

(Example) Examples of the present invention will be described in detail below based on the drawings.

FIG. 1 shows a layout diagram of solar cells and the like constituting a temperature detection device for an automobile air conditioner according to an embodiment of the present invention. As shown in the figure,
An instrument panel 2 on which various instruments are arranged is provided at the front of the vehicle interior of the vehicle 1, and near the center of this instrument panel 2,
An aspirator 3 having an inside air sensor, an aspirator fan, and a fan motor is attached inside. Further, on the top surface of the instrument panel 2, a solar radiation sensor 8 that detects the amount of solar radiation from the sun and a solar cell 9 that outputs electric power according to the amount of solar radiation from the sun are provided.
is installed. Note that the air blowing means 40 is
Aspirator fan 6 and fan motor 7 shown in the figure
It is made up of.

Further, FIG. 2 shows a specific example of a circuit for controlling the aspirator fan motor according to this embodiment. As shown in the figure, a series circuit of a resistor 11 and a solar radiation sensor 8 is connected to a power supply 10 that maintains the voltage of a battery (not shown) at a constant voltage. teeth,
A series circuit of resistor 12 and diode 13 is connected to the base of transistor 14. The collector of transistor 14 is connected to the base of transistor 16, resistor 15 and diode 17.
are connected to each other, the other end of the resistor 15 is connected to the ground, and the anode of the diode 17 is connected to the transistor 1.
8 bases, respectively. Further, the emitter of the transistor 14 and the collector of the transistor 16 are connected to the solar cell 9 and the rechargeable battery 19 which are connected in parallel, and the emitter of the transistor 16 and the collector of the transistor 18 are connected to the fan motor 7 that drives the aspirator fan 6. It is connected. The other ends of the solar cell 9, the rechargeable battery 19, and the motor 7 are connected to ground, and the emitter of the transistor 18 is connected to an ignition switch (not shown) for starting the engine.
The control means 30 is composed of each element except for the solar cell 9, the rechargeable battery 19, and the fan motor 7.

The circuit configured in this manner operates as follows.

First, as the amount of solar radiation increases, the resistance value of the solar radiation sensor 8 gradually decreases, and the voltage applied to the base of the transistor 14 decreases. When this voltage falls below a predetermined value, transistor 14 is turned on, current is supplied from solar cell 9 or rechargeable battery 19 to resistor 15, the potential of resistor 15 rises, transistor 16 is turned on, and transistor 18 is turned on. Turn off. As a result, power is supplied from the solar cell 9 or the rechargeable battery 19 to the fan motor 7 via the transistor 16, and the fan motor 7 rotates at a rotation speed corresponding to the applied voltage value.
The air inside the vehicle is sucked inside. Also, at this time,
Even if the ignition switch (not shown) is turned on, the transistor 18 is turned off, so the fan motor 7 is connected to the solar cell 9 or the rechargeable battery 19.
Only power is supplied.

On the other hand, when the amount of solar radiation decreases, the resistance value of the solar radiation sensor 8 gradually increases, and the voltage applied to the base of the transistor 14 increases. When this voltage exceeds a predetermined value, the transistor 14 is turned off, current is no longer supplied to the resistor 15 from the solar cell 9 or the rechargeable battery 19, the potential of the resistor 15 decreases, and the transistor 16 is turned off. Transistor 18 turns on. As a result, the fan motor 7 will automatically stop. but,
At this time, if an ignition switch (not shown) is turned on, power is supplied from the battery to the fan motor 7 via the ignition switch. As a result, the fan motor 7 rotates at a rotational speed corresponding to the applied voltage value, and sucks air inside the vehicle compartment into the duct 3A.

FIG. 3 shows a graph of the response characteristics of the internal air sensor in a vehicle equipped with the temperature detection device according to this embodiment. In the figure, the vertical axis represents room temperature, and the horizontal axis represents time. The conditions of the experiment were to park the vehicle under the scorching sun for a predetermined period of time, then operate the air conditioner at maximum cooling, and curve A
is the detection value of the inside air sensor in the prior art, curve B is the detection value of the inside air sensor in this embodiment, and curve C is the actual cabin air temperature.

As is clear from this graph, the response characteristics of the indoor air sensor 4 to changes in room temperature are extremely good. Therefore, even when the vehicle has been left unattended, especially when the instrument panel 2 is hot due to sunlight after the air conditioner is turned on during strong summer sunlight, the interior air sensor 4 detects the temperature inside the vehicle. temperature can be detected with high accuracy. Therefore, the accuracy of controlling the air conditioner at the initial stage of starting the vehicle is significantly improved.

Furthermore, in the circuit described above, power is often supplied from the solar cell 9 or the rechargeable battery 19, so
This will contribute to energy saving.

FIG. 4 shows a circuit diagram according to another embodiment of the present invention. This circuit is for fan motor 7
A solar cell 9 and a backflow prevention diode 20 are connected in series, and a battery (not shown) is connected to the connection point between the diode 20 and the fan motor 7 via an ignition switch.

In this circuit, when the ignition switch is turned off, power is supplied to the fan motor 7 only from the solar cell 9. On the other hand, when the ignition switch is turned on, power is supplied only from the solar cell 9.
Thus, with this circuit, it is possible to obtain substantially the same effects as those of the above-mentioned embodiment.

Although two circuits are illustrated here as control means, the present invention is not limited to these circuits, and the present invention is not limited to these circuits. Of course, any circuit may be used as long as it operates as described above.

[Effects of the invention] As is clear from the above explanation, according to the invention, even when the car is parked, when the amount of solar radiation is above a predetermined value, the air blowing means is activated to direct the air inside the car toward the inside air sensor. As a result, the inside air sensor can accurately detect the temperature of the air inside the vehicle even when the vehicle is starting up.
The control accuracy of the air conditioner at the initial stage of vehicle startup is improved.

[Brief explanation of the drawing]

FIG. 1 is an arrangement diagram of solar cells, etc. that constitute a temperature detection device for an automobile air conditioner according to an embodiment of the present invention, and FIG. 2 is an example of a circuit for controlling an aspirator fan motor according to the present embodiment. FIG. 3 is a graph showing the response characteristics of the internal air sensor in a vehicle equipped with the temperature detection device according to this embodiment. FIG. 4 is a circuit showing another example of the circuit for controlling the aspirator fan motor. Figure 5 is
Diagram showing the general mounting location of the aspirator, No. 6
The figure is a longitudinal cross-sectional view of the aspirator. 2... Instrument panel, 3... Aspirator, 3A... Aspirator duct, 4... Inner air sensor, 6... Aspirator fan (air blowing means), 7... Fan motor (air blowing means), 8... Solar radiation sensor, 9... Solar cell, 30... Control means,
40...Air blowing means.

Claims (1)

[Claims for Utility Model Registration] An aspirator 3 attached to an instrument panel 2 in a vehicle interior, and an internal air sensor 4 disposed within a duct 3A of the aspirator 3 to detect the temperature of the air in the vehicle interior.
and a blowing means 40 disposed within the duct 3A, which blows air inside the vehicle toward the inside air sensor 4.
a solar radiation sensor 8 that detects solar radiation; a solar cell 9 that outputs power according to the solar radiation; A temperature detection device for an automobile air conditioner, comprising: a control means 30 for supplying air to the air blowing means 40.