JPH01172016A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To enable ventilation and a change of air with enough wind quantity by providing a rear ventilator which conducts ventilation to a rear seat or exhaust from the inside of a car room, and operating the rear ventilator with solar batteries as a source of electricity when a heat load within the car room has become more than a predetermined value. CONSTITUTION:A front ventilating passage mechanism 4 is provided at the front portion of the car room 2 of a vehicle, and at the rear portion, a rear ventilating passage mechanism 5 is provided at the lower part of a rear shelf 13 arranged in the back of a rear seat. Also, solar batteries 8 are provided at the roof portion 7 of a car body 1, and an output which is in accordance with an insolation quantity received at its light receiving surface portion, is generated, and its output electric power can be supplied to the rear ventilating passage mechanism 5. The rear ventilating passage mechanism 5 is constituted with an internal air take-in opening 17 facing on the inside of the car room 2 and an air discharge opening 18 and a change of air opening 19, which are provided at a ventilating passage portion 20, and a rear blower fan 22 and a passage changeover door 26, which are provided at the inside. And control is made so that the rear blower fan 22 may be driven with solar batteries 8 as a source of electricity when a car room inside temperature, that is to say, heat load is more than a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention includes a blower and is equipped on a vehicle,
The present invention relates to a vehicle air conditioner that operates to air condition the interior of a vehicle.

(Prior Art) Vehicles are generally equipped with an air conditioning system to adjust the environment inside the vehicle, but such an air conditioning system consists of a blower and an air passage provided with an air outlet facing into the vehicle interior. It is equipped with a mechanism that operates a blower to supply air taken into the air passage mechanism from inside or outside the vehicle to ventilate the interior of the vehicle, or to adjust the temperature and use it for heating or cooling the interior of the vehicle. In order to achieve this, the air is blown into the vehicle interior through an air outlet provided in the ventilation path mechanism.

The air blowing path mechanism included in the air conditioner installed in such vehicles is often placed at the front of the vehicle's cabin, but there is no airflow from the front of the vehicle into the cabin. In cases where ventilation alone is not sufficient to blow air to the entire passenger compartment, the air duct mechanism may be installed not only in the front part of the passenger compartment but also in other locations, such as U.S. Pat.
As shown in Publication No. 712, it is arranged on the ceiling of the conductor, etc., and is also arranged in the rear part of the cabin, so that air is blown to the rear seats in the cabin. Ru.

The blower provided in the air passage mechanism arranged in the rear part of the vehicle compartment to blow air to the rear seats, that is, the blower provided in the rear air passage mechanism, is also arranged in the air passage mechanism arranged in the front part of the passenger compartment, i.e., the front air passage mechanism. Similar to the blower installed in the air duct mechanism, it is powered by a storage battery installed in the vehicle (hereinafter referred to as the on-board battery), and consumes power supplied from the on-board battery in accordance with its rotation. It turns out.

(Problems to be Solved by the Invention) As described above, when the blowers provided in the front air duct mechanism and the rear air duct mechanism installed in the vehicle are operated to cool the interior of the vehicle, the vehicle is exposed to When the amount of solar radiation is relatively large and the heat load inside the vehicle is large,
In order to make the cooling or ventilation effect more powerful, the blower in the rear air duct mechanism, which is similar to the blower in the front air duct mechanism, is also rotated at high speed to reduce power consumption. It will be driven by Therefore, when the heat load inside the vehicle is relatively large, the load placed on the vehicle battery is also large. If this continues, there is a risk that the burden will become excessive and the capacity of the vehicle battery will deteriorate.

In view of these points, the present invention is configured to include an air passage mechanism with an air blower disposed in a vehicle, and blow air into or exhaust air from the interior of the vehicle through the air passage mechanism. When blowing air into or exhausting air from the vehicle interior when the heat load in the vehicle interior is relatively large, supplying or exhausting a sufficient amount of air to the vehicle interior for effective cooling or ventilation. An object of the present invention is to provide an air conditioner for a vehicle that can discharge air from the interior of a vehicle and can effectively reduce the burden placed on an onboard battery.

(Means for Solving the Problems) In order to achieve the above-mentioned object, an air conditioner for a vehicle according to the present invention includes a solar cell installed in the vehicle and transmitting an output according to the amount of solar radiation, and a solar cell installed in the vehicle. The vehicle is equipped with a rear blower that is equipped to blow air to the rear seats inside the vehicle or to exhaust air from the vehicle interior, and is capable of operating when either a solar battery or a storage battery installed in the vehicle is used as a power source. Additionally, a heat load detection means for generating a detection output according to the heat load in the vehicle interior, and a control means for controlling the power supply to the rear blower based on the detection output obtained from the heat load detection means are provided. , the control means is
When the heat load inside the vehicle exceeds a predetermined value, the rear blower is operated using the solar battery as a power source.

(Function) In the vehicle air conditioner configured as described above, when the rear blower is activated, the heat load inside the vehicle cabin detected by the heat load detection means is equal to or higher than a predetermined value, and the rear blower is activated. When the blower is to be placed in a state where the blower rotates at a relatively high speed and consumes a large amount of power, the control means causes the rear blower to operate by receiving power from the solar cell; When the heat load in the vehicle interior detected by the heat load detection means does not reach a predetermined value, the control means causes, for example, a rear blower to operate using the vehicle battery as a power source.

By controlling the power supply to the rear blower in this way, the effect can be improved when the rear blower blows air into the passenger compartment or ventilates the passenger compartment when the heat load in the passenger compartment is relatively large. A sufficient amount of air is supplied to or discharged from the vehicle interior to provide adequate cooling or ventilation, and the load placed on the vehicle battery is effectively reduced.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a vehicle equipped with an example of an air conditioner according to the present invention. In FIG. 2, a front air passage mechanism 4 is disposed in the front part of a cabin 2 provided in a vehicle body 1 of the vehicle, and a front air passage mechanism 4 is disposed in the rear part of the cabin 2 behind the rear seats. A rear air passage mechanism 5 is disposed below the shelf I3. Further, an on-vehicle battery 6 is installed in the front part of the engine compartment provided in the vehicle body 1, and the on-vehicle hunter 6 uses its output power to the front air passage mechanism 4. It can be supplied to the rear air passage mechanism 5 and other parts.

On the other hand, a solar cell 8 is disposed on the roof portion 7 of the vehicle body 1. The solar cell 8 has its light-receiving surface facing outward from the roof portion 7 and is covered with a transparent protection plate, and is designed to generate output according to the amount of solar radiation received on the light-receiving surface. For example, in FIG. 3, the output characteristic is the output voltage BV on the horizontal axis, and the output current BI on the vertical axis.
is taken, the amount of solar radiation Es is used as a parameter, and the solar radiation is shown as a solid line (in FIG. 3, m and n are each positive numbers). As is clear from the output characteristics shown in FIG. 3, the output voltage BV of the solar cell 8 takes a maximum value that is approximately constant regardless of the amount of solar radiation Es, and the output current BT takes a constant value. output voltage BV
For example, when the solar radiation is 20 mW/cm2 to 1
As it increases to 00 mW/cm2, it increases at a substantially constant rate of increase, and increases and decreases approximately in proportion to the amount of solar radiation Es. The output of the solar cell 8 is appropriately supplied to the rear air passage mechanism 5 during its operation.

A solar radiation sensor 10 is disposed inside the vehicle interior 2 at a position near the lower portion of the front windshield 9 . The solar radiation sensor 10 detects the amount of solar radiation received by the vehicle body 1 and generates a detection output according to the amount of solar radiation. Further, a temperature sensor 12 is arranged inside the vehicle interior 2 at a position near the lower part of the rear windshield 11, and this temperature sensor 12 detects and detects the room temperature inside the vehicle interior 2. It is assumed that a detection output is generated according to the room temperature.

Further, inside the vehicle compartment 2, there is a rear blower switch 15 that is operated to put the rear blower passage mechanism 5 into an operating state, and a rear blower switch 15 that controls the operation of the front blower passage mechanism 4, the rear blower passage mechanism 5, etc. A control circuit section 50 is also arranged.

The rear air passage mechanism 5 is configured, for example, as shown in FIG. This ventilation passage section 20 includes an inside air intake 17 and an air outlet 18 that penetrate through the rear shelf 13 and face the interior of the vehicle compartment 2, and a ventilation opening that opens below the rear shelf 13. 19 are provided. Further, inside the ventilation passage section 20, a blower fan 22 constituting a rear blower is disposed together with an blower motor 23 for rotationally driving the blower fan 22, and in addition, an evaporator fan 24 for cooling and a passage switching A door 26 is also provided. The evaporator 24 is connected, for example, to a cooler provided in the front air passage mechanism 4 via a refrigerant passage 24a. Furthermore, a door motor 27 for operating the passage switching door 26 is attached to the outside of the ventilation passage section 20.

When the rear air blow switch 15 is operated and the rear air passage mechanism 5 is placed in a state where it can be operated, the passage switching door 26 assumes the position shown by the solid line or the position shown by the dashed-dotted line in FIG. be taken as a thing. When the passage switching door 26 is assumed to be in the position shown by the solid line in FIG. Rear blower fan 2 by motor 23
2 is driven to rotate. As a result, the air inside the vehicle compartment 2 is taken into the ventilation passage section 20 through the inside air intake port 17, the temperature of the air taken into the ventilation passage section 20 is lowered by the evaporator 24, and the air passes through the passage switching door 26. The air is sent out from the air outlet 18 to the rear seats in the vehicle interior 2. At this time, the flow rate of air sent into the vehicle compartment 2 is determined according to the rotational speed of the rear blower fan 22. Further, when the passage switching door 26 is assumed to be in the position shown by the dashed line in FIG.
In order to ventilate the interior of the vehicle compartment 2, the rear blower fan 22 is rotated by the rear blower motor 23 while the evaporator 24 is inactive. Thereby, the air inside the vehicle compartment 2 is sucked into the ventilation passage section 20 through the inside air intake port 17, and the air sucked into the ventilation passage section 20 is discharged into the atmosphere through the ventilation opening 19.

At this time, the flow rate of air sucked into the ventilation passage section 20 from the vehicle interior 2 and discharged is determined according to the rotational speed of the rear blower fan 22.

5. A rear air passage mechanism including a blower fan 22, a rear blower motor 23, a passage switching door 26, and a door motor 27 constituting a rear air blower as described above. solar cell 82
Solar radiation sensor 10. Temperature sensor 12. Rear fan switch 1
5 and the control circuit section 50, an example of a vehicle air conditioner according to the present invention is configured. The rear blower motor 23 and the door motor 27 each have a control circuit section 50.
The control circuit section 50 that performs such control is operated under the control of, for example, electrical connections as shown in FIG.

An example of the control circuit section 50 shown in FIG. 1 includes the control unit 30. A parking state detection circuit 31 that detects that the automobile is in a parked state. A power supply switching circuit 32 and motor drive circuits 33 and 34 are built in. The control unit 30 receives a detection output signal Sa from the solar radiation sensor 10.

Detection output signal Sb from temperature sensor 12, signal Sg from rear blower switch 15, and parking state detection circuit 31
The detection output signal Sp is supplied from the control? The IO unit 30 receives these signals Sa and Sb.

Based on Sg and Sp, control signals Ca+, Caz, and Ca3 are selectively supplied to the power supply switching circuit 32, control signals cb are supplied to the motor drive circuit 33, and control signals Cc1 and Cc1 are supplied to the motor drive circuit 34. Cc2 is selectively supplied.

The power supply switching circuit 32 selects the output voltage (8) of the on-board battery 6 from among the output voltage VB of the on-board battery 6 and the output sensing pressure (2) of the solar cell in accordance with the control signal Ca+, and applies it to the motor drive circuit 34. In addition, according to the control signal Caz, the output voltage of the solar cell is selected from among the output voltage of the in-vehicle battery 6 and the output voltage of the solar cell, and is applied to the motor drive circuit 33. Furthermore, in accordance with the control signal Ca3, the output voltage (8) of the on-vehicle batch I76 is selected from among the output voltage VB of the on-vehicle battery 6 and the output voltage (3) of the solar cell, and is applied to the motor drive circuit 33. supply The motor drive circuit 33 supplies one of the output voltage (8) of the in-vehicle battery 6 and the output voltage (3) of the solar cell to the rear blower motor 23 as a power supply voltage in accordance with the control signal cb. Car battery 6
The motor drive circuit 34 is operated by receiving power from one of the solar cells and the solar cell, and further, the motor drive circuit 34 converts the output voltage 8 of the on-board battery 6 into a power supply voltage having a positive polarity in accordance with the control signal Cc+. is supplied to the door motor 27, and the door motor 27 is configured to rotate in the first direction in response to power supplied from the on-vehicle batch IJ6, and in accordance with the control signal Cc2, the output voltage 6 of the on-board battery 6 is set to the negative polarity. supplying it to the door motor 27 as a power supply voltage having a
The door motor 27 is configured to receive power from the vehicle battery 6 and rotate in a second direction opposite to the first direction.

At this point, the control unit 30 is supplied with a signal Sg from the rear blower switch 15 indicating that the rear blower switch 15 is in the ON state so that the rear blower switch 15 can operate the rear air passage mechanism 5. In the parking state, when the parking state detection circuit 31 supplies the detection output signal Sp indicating that the vehicle is not in the parking state, the control signal Ca
, to the power supply switching circuit 32, and the control signal Cc+ to the motor drive circuit 34 to rotate the door motor 27 in the first direction while receiving power from the vehicle battery 6, thereby switching the passage. The door 26 is assumed to be in the position shown by the solid line in FIG. Under such circumstances, the control unit 30 detects the detection output signal sb from the temperature sensor 12.
The temperature inside the vehicle interior 2 is detected based on the temperature. As a result, when the temperature inside the vehicle compartment 2 is above a predetermined value, that is, when the thermal load inside the vehicle compartment 2 is above a predetermined value, the control signal Ca2 is supplied to the power supply switching circuit 32, and the control signal cb is used to drive the motor. The power is supplied to the circuit 33 to operate the rear blower motor 23 with power supplied from the solar cell 8, thereby rotating the rear blower fan 22 at a relatively high speed. In such a case, the evaporator 24 is put into operation and cold air is sent out toward the rear seats in the vehicle interior 2.

On the other hand, when the temperature inside the vehicle compartment 2 is less than a predetermined value, that is, the heat load within the vehicle compartment 2 has not reached the predetermined value, the control signal C
a, to the power supply switching circuit 32 and control signal c.
b is supplied to the motor drive circuit 33, the rear blower motor 23 is operated with power supplied from the vehicle battery 6, and the rear blower fan 22 is rotated at a relatively low speed.

Under such circumstances, the evaporator 24 may be in an operating state or in a non-operating state, and therefore,
Cool air or air whose temperature has not been lowered is sent toward the rear seats in the vehicle interior 2.

The control unit 30 also receives a detection output signal sp from the parking state detection circuit 31 to indicate that the vehicle is in the parked state.
is supplied, the control signal Ca1 is sent to the power supply switching circuit 32.
In addition, the control signal Ccz is supplied to the motor drive circuit 34 to rotate the door motor 27 in the second direction while receiving power from the on-board battery 6, and the passage switching door 26 is rotated as shown in FIG. The position shown by the dashed line shall be taken. Under such circumstances, the control unit 30 detects the amount of solar radiation received by the vehicle based on the detection output signal Sa from the solar radiation sensor 10. As a result, when the amount of solar radiation received by the vehicle is greater than or equal to a predetermined value, it is determined that the heat load in the vehicle interior 2 is greater than or equal to the predetermined value, and the control signal Ca2 is supplied to the power supply switching circuit 32, and the control signal cb is supplied to the motor drive circuit 33, the rear blower motor 23 is operated with power supplied from the solar cell 8, and the rear blower fan 22 is rotated.

On the other hand, when the temperature inside the vehicle compartment 2 is less than a predetermined value,
It is determined that the heat load in the vehicle compartment 2 is less than a predetermined value, and no separate operation is performed. That is, only when the amount of solar radiation received by the vehicle is equal to or higher than a predetermined value, the rear blower motor 23 is operated with power supplied from the solar cell 8 to rotate the rear blower fan 22. As a result, the air from inside the vehicle compartment 2 is exhausted and the interior of the vehicle compartment 2 is ventilated.
The rise in temperature inside the vehicle compartment 2 is suppressed.

In such a case, the solar radiation sensor IO is used as a heat load detection means that generates a detection output signal according to the heat load in the vehicle interior 2.

In this way, when the rear air blow switch 15 is turned on and the rear air passage mechanism 5 blows air into the passenger compartment 2, both when the vehicle is not in the parked state and when the vehicle is in the parked state. However, when the heat load inside the vehicle compartment 2 exceeds a predetermined value, the rear blower fan 22 is operated based on the power from the solar cell 8, so that the load on the vehicle battery 6 is not increased. Cool air or untempered air is sent to the rear seats in the vehicle interior 2, or the interior of the vehicle interior 2 is ventilated, so that the temperature increase in the vehicle interior 2 is effectively suppressed. become.

As described above, the power supply switching circuit 32. Rear blower motor 23
The control units 1 to 30 that control the operation of the door motor 27 are configured by, for example, a microcomputer, and an example of a control operation program executed by the microcomputer is as shown in FIG. be done.

In this program, after the start, Decision 6
0, it is determined whether the rear ventilation switch 15 is in the ON state based on the signal Sg from the rear ventilation switch 15, and if the rear ventilation switch 15 is not in the ON state, the determination is made in decision 60. repeat. Then, as a result of the judgment in decision 60, if it is determined that the rear fan switch 15 is in the ON state, decision 6
1, based on the detection output signal Sp from the parking state detection circuit 31, it is determined whether the vehicle is in the parked state. When the vehicle is not in the parked state, in process 62, a control signal Ca is sent out and supplied to the power supply switching circuit 32, and a control signal Cc is sent out and supplied to the motor drive circuit 34. As a result, the door motor 27 is rotated in the first direction while being supplied with power from the vehicle battery 6, and the passage switching door 26 assumes the position shown by the solid line in FIG.

Subsequently, in decision 63, based on the detection output signal sb from the temperature sensor 12, it is determined whether the temperature TSb inside the vehicle compartment 2 detected by the temperature sensor 12 is equal to or higher than a predetermined value To. As a result, when the temperature TSb inside the passenger compartment 2 detected by the temperature sensor 12 is equal to or higher than the predetermined value To, that is, when the heat load inside the passenger compartment 2 is relatively large, in the process 64, the control signal Ca , and supply it to the power supply switching circuit 32, and the control signal c
b is sent out and supplied to the motor drive circuit 33, and then returns to decision 60. As a result, the rear blower motor 23 operates under power supply from the solar cell 8 and rotates the rear blower fan 22 at a relatively high speed. Air is blown to the rear seats with a relatively large amount of air, and a rise in temperature within the vehicle interior 2 is suppressed.

Also, as a result of the judgment in decision 63, the temperature sensor 1
2, the temperature TSb inside the vehicle compartment 2 detected by
If the thermal load inside the vehicle compartment 2 is relatively small, in process 65, the control signal Ca3 is
The control signal cb is sent out and supplied to the power supply switching circuit 32, and the control signal cb is sent out and supplied to the motor drive circuit 33, after which the process returns to decision 60. As a result, the rear blower motor 23 is operated with power supplied from the vehicle battery 6, and the rear blower fan 22 is rotated at a relatively low speed. Air is blown to the rear seats with a relatively small amount of air.

On the other hand, if the vehicle is in the parked state as a result of the determination in decision 61, in process 66, control signal Ca
+ is sent out and supplied to the power supply switching circuit 32, and at the same time, a control signal Ccz is sent out and supplied to the motor drive circuit 34. As a result, the door motor 27 is rotated in the second direction under power supply from the vehicle battery 6, and the passage switching door 26 assumes the position shown by the dashed line in FIG. Next, Decision 67
Based on the detection output signal Sa from the solar radiation sensor 10, it is determined whether the solar radiation amount ISa detected by the solar radiation sensor 10 is greater than or equal to a predetermined value Io. the result,
When the amount of solar radiation ISa detected by the solar radiation sensor 10 is less than the predetermined value 1o, it is determined that the heat load in the vehicle interior 2 is relatively small, and the process returns to decision 60. Further, as a result of the determination in decision 67, when the amount of solar radiation ISa detected by the solar radiation sensor 10 is equal to or greater than the predetermined value 10, it is determined that the heat load in the passenger compartment 2 is relatively large, and in process 68, a control signal is sent. Ca2 is sent out and supplied to the power supply switching circuit 32, and a control signal cb is sent out and supplied to the motor drive circuit 33, and then decision 6
Return to 0. As a result, the rear blower motor 23 operates under power supply from the solar cell 8 and rotates the rear blower fan 22, and the air inside the vehicle compartment 2 passes through the inside air intake port 17 to the ventilation passage. After being sucked into the compartment 20, it is discharged into the atmosphere through the ventilation port 19 and
The interior of the vehicle is ventilated, and the temperature rise within the vehicle interior 2 is suppressed.

(Effects of the Invention) As is clear from the above description, according to the vehicle air conditioner according to the present invention, air is blown into the vehicle interior or exhausted from the vehicle interior through the rear air passage mechanism with the rear blower. In order to effectively cool or ventilate the interior of the vehicle, the rear air duct mechanism is used to blow air to the rear seats in the vehicle interior or to exhaust air from the vehicle interior, where the heat load is relatively large. This can be done with a sufficient amount of airflow, and furthermore, it is possible to avoid an increase in the burden placed on the vehicle battery.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical connections of a control circuit used in an example of a vehicle air conditioner according to the present invention, and FIG.
The figure is a perspective view showing a vehicle equipped with an example of a vehicle air conditioner according to the present invention, FIG. 3 is a characteristic diagram showing an example of the output characteristics of a solar cell, and FIG. 4 is a vehicle air conditioner according to the present invention. FIG. 5 is a cross-sectional view showing the main part of an example of the microcontroller that constitutes the control unit used in the control circuit section shown in FIG.
2 is a flowchart showing an example of a control operation program executed by a computer. In the figure, 5 is a rear air passage mechanism, 6 is an in-vehicle honeycomb, 8 is a solar cell, 10 is a solar radiation sensor, 12 is a temperature sensor, 13 is a rear shelf, 17 is an inside air intake, 18 is an air outlet,
22 is a rear blower fan, 23 is a blower motor, 2
6 is an aisle switching door, 27 is a door morph, 30 is a control unit, 31 is a parking state detection circuit, 32 is a power supply switching circuit,
33 and 34 are motor drive circuits, and 50 is a control circuit section. Patent applicant Mazda Motor Corporation Figure 1 5°-Circuit section V

Claims (1)

[Scope of Claims] A solar cell disposed in a vehicle to output an output according to the amount of solar radiation, and the vehicle is equipped to blow air to a rear seat in the vehicle interior or to exhaust air from the vehicle interior, a rear blower capable of operating even when either the solar cell or the storage battery installed in the vehicle is used as a power source; and a heat load detection means that generates a detection output according to the heat load in the vehicle interior. , Based on the detection output obtained from the heat load detection means, when the heat load in the vehicle interior exceeds a predetermined value, power supply control is performed so that the rear blower is operated with the solar cell as a power source. A vehicle air conditioning system comprising: a control means for performing the following;