JPH05310034A - Heat pump type air conditioner for automobile - Google Patents

Abstract

PURPOSE:To prevent low temperature blowing out wind from rising at the feet or the like of a riding member and a windowpane from becoming blurred during defrosting. CONSTITUTION:This device is equipped with a heat pump to defrost by means of hot gas frost at a room outside heat exchanger 5; the foot blowing out opening 15 of air conducted with heat exchange by means of the room inside heat exchanger 3 of the heat pump; a face blowing out opening 16; a front glass blowing out opening 17; dampers 18, 19, 20 to open/close these; and a ventilator 13. When the frost detecting means of the room outside heat exchanger detects frost, a defrosting mechanism is operated, and at the same time the foot blowing out opening damper 18, the face blowing out opening damper 19 are closed and the front glass blowing out opening damper 20 is opened by means of a defrost control means that issues an opening/closing command to dampers. Moreover, in the case of hot gas defrosting, a hot gas solenoid valve 7 is opened and hot gas from a compressor is delivered into the room outside heat exchanger 3 by bypassing the room inside heat exchanger 3, and defrosting is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner for automobiles used in electric vehicles and the like.

[0002]

2. Description of the Related Art FIG. 1 shows the configuration of a conventional air conditioner for an electric vehicle, which also serves as a schematic view of a first embodiment of the present invention.

During the heating operation, the refrigerant gas compressed by the compressor 1 passes from the pipe a of the four-way valve 2 to the pipe d, is condensed and liquefied by the indoor heat exchanger 3, and then expanded by the expansion valve 4 to be stored outdoors. Evaporate in the heat exchanger 5. The evaporated and gasified refrigerant passes through the pipe b of the four-way valve 2, the pipe c, the accumulator 6, and is sucked into the compressor 1.

When the outdoor heat exchanger 5 is frosted, the temperature sensor 8 attached to the surface of the outdoor heat exchanger 5 detects that the temperature of the outdoor heat exchanger 5 drops below a predetermined value. ,
The hot gas bypass solenoid valve 7 is switched from closed to open, and the defrosting operation is started.

In the defrosting operation, the refrigerant gas discharged from the compressor 1 is caused to flow to the outdoor heat exchanger 5 through the hot gas bypass solenoid valve 7 to raise the surface temperature of the outdoor heat exchanger 5 and to adhere the frost. Melt.

Further, 11 is an on-vehicle battery, and 12 is
It is an inverter that outputs AC power by using the battery 11 as an input, and drives an AC motor built in the compressor 1.

Further, 13 is a fan for blowing air, 14 is an outside air introduction port, 15 is a foot outlet, 16 is a face outlet, 17
Is a windshield outlet for removing the fog on the window glass, 18 is a foot outlet damper that opens and closes the foot outlet 15, 19 is a face outlet damper that opens and closes the face outlet 16, and 20 is a windshield outlet. It is a windshield blowing damper that opens and closes 17.

[0008]

The above-mentioned conventional air conditioners for electric vehicles have the following problems to be solved.

That is, in the conventional apparatus, since only a part of the refrigerant discharged from the compressor 1 flows into the indoor heat exchanger 3 during the defrosting operation, the heating capacity of the indoor heat exchanger 3 is reduced. For this reason, there is a problem that the temperature of the air blown out from the foot outlet 15 into the vehicle compartment through the indoor heat exchanger 3 decreases, and the comfort of the occupant is impaired.

Further, when the blower fan 13 is stopped in order to prevent the low-temperature blown air from flowing to the feet, it becomes impossible to ventilate the vehicle interior due to the introduction of the air outside the vehicle, so that the humidity in the vehicle interior increases. As a result, the window glass becomes cloudy, hindering the visibility, and driving the car is dangerous.

In order to solve the above problems, the present invention solves the above problems by using a heat pump type air conditioner for automobiles in which no low-temperature blowout air is emitted to the occupants' feet or the like and the window glass is not fogged. The purpose is to provide.

[0012]

As a means for solving the above problems, the present invention is to provide a heat pump type air conditioner for an automobile as described in (1) and (2) below. (1). A heat pump that has an outdoor heat exchanger and an indoor heat exchanger, and has a defrosting mechanism that defrosts the frost that has frosted on the outdoor heat exchanger with hot gas, and heat was exchanged with the indoor heat exchanger of the heat pump. For a vehicle including a foot outlet, a face outlet, and a windshield outlet that blows air into the passenger compartment, a damper that opens and closes each of these outlets, and a blower that blows air to an indoor heat exchanger In the heat pump type air conditioner, a frost detection means for detecting frost formation on the outdoor heat exchanger, and when the frost detection means detects frost formation, the defrosting mechanism is activated and the damper is attached. The defrost control means for issuing an opening / closing command, and the damper control means for closing the foot outlet damper and the face outlet damper and opening the windshield outlet damper according to the instruction from the defrost controlling means. That Automotive heat pump type air conditioner according to symptoms. (2). A heat pump that has an outdoor heat exchanger and an indoor heat exchanger, and has a defrosting mechanism that defrosts the frost that has frosted on the outdoor heat exchanger with hot gas, and heat was exchanged with the indoor heat exchanger of the heat pump. For a vehicle including a foot outlet, a face outlet, and a windshield outlet that blows air into the passenger compartment, a damper that opens and closes each of these outlets, and a blower that blows air to an indoor heat exchanger In the heat pump type air conditioner, the windshield fog detecting means, the frost detecting means for detecting frost on the outdoor heat exchange, and the frost detecting means detects the frost, the defrosting mechanism, The defrost control means that activates the blower and issues an opening / closing command to the damper, and closes at least the foot outlet damper and the face outlet damper according to a command from the defrost controlling means. When both the fog detecting means detects the fog on the windshield, at least the damper control means for opening the windshield outlet damper and the blower in response to a command from the defrost control means, and during defrosting. A heat pump type air conditioner for an automobile, comprising: a blower control means for operating the blower when the fog detecting means detects a windshield fog.

[0013]

Since the present invention is constructed as described above, it has the following actions.

(1). In the configuration of (1) above, when the frost detection means for detecting frost formation on the outdoor heat exchanger detects frost formation, the defrost mechanism is activated and the defrost control means is operated by the foot outlet damper. Since the damper control means is instructed to close the face outlet damper and open the windshield outlet damper, the low-temperature air that has passed through the indoor heat exchanger whose heating power has decreased due to defrost blows to the occupants' feet and face. Never put out. Therefore, the passenger does not feel uncomfortable.

Further, since the air is blown to the windshield, the windshield is not clouded.

(2). In the configuration of (2) above, when the frost formation detecting means detects frost formation on the outdoor heat exchanger, the blower fan is stopped simultaneously with the start of the defrosting operation by the defrosting mechanism. However, during the defrosting operation, when the fog on the windshield is detected by the fog detecting means, the blower control means operates the blower fan again, and at the same time, the damper control means receives a command from the defrosting control means. The foot outlet damper closes the foot outlet, the face outlet damper closes the face outlet, and the windshield outlet damper opens the windshield outlet.

As a result, the air that has passed through the indoor heat exchanger is blown out into the vehicle compartment from the windshield outlet and is ventilated, so that the fog on the windshield is removed. At the same time, the low-temperature air blocks the blowing of the occupant's feet and face, so that the occupant does not feel uncomfortable.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first and second embodiments of the present invention will be described with reference to FIGS. The same components as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted unless necessary.

(First Embodiment) The first aspect of the invention according to claim 1
An embodiment will be described with reference to FIGS.

FIG. 1 is a schematic side view of an air conditioner for an electric vehicle according to a first embodiment, which is provided with frost detection means, defrost control means, damper control means and the like shown in FIG. 2, but avoids complexity. Therefore, the illustration is omitted, and it is visually shown as in the conventional example. That is, the configuration is the same as the conventional example except for the configuration of FIG.

FIG. 2 is a block diagram of the essential parts of the first embodiment.
Reference numeral 22 is a frost formation detecting means for detecting frost formation in the outdoor heat exchanger 5 of FIG. 1, and 23 is a defrosting mechanism for defrosting with hot gas when the frost formation detection means 22 detects frost formation. FOOT damper 18, FACE damper 1
9. Defrost control means for issuing an opening / closing command to the DEF damper 20, and 24 for FOO in response to a command from the defrost control means 23.
It is a damper control means that closes the T damper 18 and the FACE damper 19 and opens the DEF damper 20.

In FIG. 2, since the name and the like must be simply described due to the restriction as a block diagram, the "foot blower damper 18", "face blower damper 19", "of FIG. Windshield damper 20 "
As described above, "FOOT damper 18" and "F
These are abbreviated as "ACE damper 19" and "DEF damper 20". The same applies to the second embodiment described later.

FIG. 3 is a control flow chart of the first embodiment.

Next, the operation of the above configuration will be described mainly with reference to the name of the configuration of FIG. 1 and the control flow chart of FIG.

When the air conditioner for the electric vehicle of the first embodiment is in heating operation, in step 1, whether or not the temperature of the outdoor heat exchanger 5 is above a predetermined value is attached to the surface of the outdoor heat exchanger 5. The temperature sensor 8 detects and determines. If the value is equal to or more than the predetermined value, the process proceeds to step 2 to continue the heating operation.

On the other hand, if it is less than the predetermined value, it is judged that the outdoor heat exchanger 5 is frosted, and the routine proceeds to step 3, where the hot gas bypass solenoid valve 7 is opened to perform the defrosting operation.

In the case of the defrosting operation, next, in step 4, the foot blowing damper 18 is closed, the face blowing damper 19 is closed, and the windshield blowing damper 20 is opened.

Next, in step 5, the outdoor heat exchanger 5
The temperature sensor 8 detects whether or not the temperature is higher than the return temperature and determines. If the temperature is below the return temperature, the outdoor heat exchanger 5
It is determined that the frost attached to the frost has not been sufficiently melted, and the process proceeds to step 6 to continue the defrosting operation.

On the other hand, when the temperature is higher than the return temperature, it is judged that the frost attached to the outdoor heat exchanger 5 has melted, and the process proceeds to step 7,
The solenoid valve 7 for hot gas bypass is closed to return to the heating operation.

In this case, the process proceeds to step 8,
The opening / closing of the foot blowing damper 18, the face blowing damper 19, and the windshield blowing damper 20 is returned to the heating operation state before the defrosting operation is started.

(Second Embodiment) Second embodiment according to the invention of claim 2
An embodiment will be described with reference to FIGS.

FIG. 4 is a schematic side view of an air conditioner for an electric vehicle according to the second embodiment, in which the frost detection means, defrost control means, damper control means, blast control means, fog detection means, etc. shown in FIG. Although attached, the illustration is omitted to avoid complication. FIG. 5 is a block diagram of an essential part of the second embodiment, which includes 23a.
When the frost detection means 22 detects frost, it operates the defrosting mechanism, stops the blower 13, and performs FOOT.
The defrost control means for issuing an opening / closing command to the damper 18, the FACE damper 19, and the DEF damper 20, 24a closes at least the FOOT damper 18 and the FACE damper 19 according to a command from the defrost control means 23a, and the fog detecting means 26 makes the windshield When cloudy weather is detected, at least a damper control means for opening the DEF damper 20, 25 is used to stop the blower 13 in response to a command from the defrosting control means 23a, and a cloudy weather detecting means 26 detects cloudy weather on the windshield during defrosting. At this time, the blower control means for driving the blower 13 and the reference numeral 26 are fog detecting means for detecting fog on the windshield.

FIG. 6 is a control flowchart of the second embodiment.

In FIG. 4, reference numeral 21 denotes a fog sensor provided on the windshield for detecting fog on the windshield. Other configurations are the same as those in FIG. 1 except for the block diagram attachments in FIGS. 2 and 5.

Next, the operation of the above configuration will be described mainly with reference to the configuration name of FIG. 4 and the control flow chart of FIG.

When the air conditioner for an electric vehicle of the second embodiment is performing heating operation, in step 1, whether or not the temperature of the outdoor heat exchanger 5 is above a predetermined value is attached to the surface of the outdoor heat exchanger 5. The temperature sensor 8 detects and determines.

If it is equal to or larger than the predetermined value, the process proceeds to step 2,
Continue heating operation. On the other hand, when it is less than the predetermined value, it is determined that the outdoor heat exchanger 5 is frosted, and the process proceeds to step 3,
The solenoid valve 7 for hot gas bypass is opened to perform the defrosting operation.

In the case of the defrosting operation, the process proceeds to step 4 and the blower fan 13 is stopped.

Next, in step 5, the foot blowout damper 18 is closed and the face blowout damper 19 is closed. This prevents the traveling wind flowing from the outside air inlet 14 from hitting the occupant.

Next, in step 6, the fogging sensor 21
Determines whether windshield fog is detected.

When the fog sensor 21 does not detect the fog on the windshield, the defrosting operation is performed in this state with the blower fan 13 stopped.

When the fog sensor 21 detects the fog on the windshield, the process proceeds to step 7 and the blower fan 1
Drive 3 again.

Next, in step 8, the windshield blowing damper 20 is opened.

Next, in step 9, the outdoor heat exchanger 5
The temperature sensor 8 detects whether or not the temperature is higher than the return temperature and determines. If the temperature is below the return temperature, the outdoor heat exchanger 5
It is determined that the frost on the frost has not sufficiently melted, and the process proceeds to step 10 to continue the defrosting operation.

On the other hand, when the temperature is equal to or higher than the return temperature, it is determined that the frost on the outdoor heat exchanger 5 has melted, and the routine proceeds to step 11, where the hot gas bypass solenoid valve 7 is closed and the heating operation is resumed.

In this case, next, in step 12, the opening and closing of the foot blower damper 18, the face blower damper 19, and the windshield blower damper 20 are returned to the state during the heating operation before the start of the defrosting operation.

As described above, according to the first embodiment, when the outdoor heat exchanger 5 is frosted, the solenoid valve 7 is opened to open the outdoor heat exchanger 5.
The hot gas is blown to the room and the foot blower damper 18 and the face blower damper 19 are closed, respectively, and the windshield blower damper 20 is opened. Even if the temperature is low and the eyes are low, the low-temperature air does not hit the occupant's feet or face, which is advantageous in improving comfort.

Further, since the air outside the vehicle is blown to the windshield from the windshield outlet 17, there is an advantage that the windshield is prevented from fogging.

Further, according to the second embodiment, the outdoor heat exchanger 5
When frost forms on the solenoid valve 7, the solenoid valve 7 is opened to send hot gas to the outdoor heat exchanger 5, the fan 13 for blowing is stopped, and
Since the foot blower damper 18 and the face blower damper 19 are closed, the wind does not come to any part of the occupant's feet or face, and the in-vehicle air (warm air) is not replaced with low temperature air, which is completely comfortable. It has the advantage of not being damaged.

Further, when the windshield is fogged, the fog sensor 21 detects this, the blower fan 13 is operated again, the foot blower damper 18 and the face blower damper 19 are closed, and the windshield blower damper 20 is opened. There is an advantage that the effect equivalent to that of the first embodiment can be obtained in that the occupant's comfort is maintained and the fogging of the windshield is eliminated.

[0051]

Since the present invention is constructed as described above, it has the following effects.

That is, in the invention of claim 1, during the defrosting operation, since the foot blower damper and the face blower damper are closed, it is possible to prevent low-temperature blown air from hitting the foot and face of the occupant and improving the comfort. To do.

Further, since the windshield blowing damper is opened and the warm air is blown to the windshield, the air inside the vehicle is ventilated by the air outside the vehicle, and it is possible to prevent the windshield from becoming fogged, which results in safety in driving the vehicle. Can be secured.

Further, in the invention of claim 2, during the defrosting operation, the blower fan is stopped and the foot blower and the face blower dampers are closed, so that the low temperature blown air hits the occupant's feet and face. Can be prevented and comfort is improved.

When the windshield is fogged, it is detected by the fog detector to restart the blower fan to open the windshield blower damper to ventilate the vehicle interior with the air outside the vehicle. Therefore, it is possible to remove the fogging of the windshield and ensure safety in driving the vehicle.

[Brief description of drawings]

FIG. 1 is a schematic side view of an electric vehicle air conditioner according to a first embodiment of the present invention (however, it also serves as a view of a conventional example),

FIG. 2 is a block diagram of a main part of the first embodiment,

FIG. 3 is a control flowchart of the first embodiment,

FIG. 4 is a schematic side view of an air conditioner for an electric vehicle according to a second embodiment of the present invention,

FIG. 5 is a block diagram of a main part of the second embodiment,

FIG. 6 is a control flowchart of the second embodiment.

[Explanation of symbols]

 3 Indoor heat exchanger 5 Outdoor heat exchanger 7 Solenoid valve 8 Temperature sensor 13 Blower fan 14 Outside air inlet 15 Foot outlet 16 Face outlet 17 Front glass outlet 18 Foot outlet damper 19 Face outlet 20 Windshield damper 21 Fog Sensor 22 Frost Detection Means 23, 23a Defrost Control Means 24, 24a Damper Control Means 25 Blower Control Means 26 Fog Detection Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryosaku Akimoto Aichi Prefecture Nishi Kasugai-gun Nishibiwajima-cho, Asahi-cho 3-chome Asahi Factory (72) Inventor Koji Fujita Aichi Prefecture Nishi-Kasugai-gun Nishibashijima-cho Asahi-cho 3-chome Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory

Claims (2)

[Claims] 1. A heat pump having an outdoor heat exchanger and an indoor heat exchanger, the heat pump having a defrosting mechanism for defrosting frost formed on the outdoor heat exchanger by hot gas, and an indoor heat exchanger of the heat pump. Equipped with a foot outlet, a face outlet, and a windshield outlet that blows out the heat-exchanged air into the passenger compartment, a damper that opens and closes each of these outlets, and a blower that blows air to the indoor heat exchanger. In a heat pump type air conditioner for automobiles that is configured to, frost detection means for detecting frost on the outdoor heat exchanger, and when the frost detection means detects frost, activate the defrosting mechanism. Along with this, defrost control means for issuing an opening / closing command to the damper, and damper control for closing the foot outlet damper and the face outlet damper and opening the windshield outlet damper according to a command from the defrost controlling means Means and A heat pump type air conditioner for an automobile, which is characterized by being provided. 2. A heat pump having an outdoor heat exchanger and an indoor heat exchanger, the heat pump having a defrosting mechanism for defrosting frost formed on the outdoor heat exchanger with hot gas, and an indoor heat exchanger of the heat pump. Equipped with a foot outlet, a face outlet, and a windshield outlet that blows out the heat-exchanged air into the passenger compartment, a damper that opens and closes each of these outlets, and a blower that blows air to the indoor heat exchanger. In a heat pump type air conditioner for automobiles that is made, windshield fog detection means, frost detection means for detecting frost formation on the outdoor heat exchange, and when the frost detection means detects frost formation, While operating the defrosting mechanism, defrosting control means for issuing a stop command to the blower and an opening / closing command for the damper, and at least a foot outlet damper and a face outlet damper according to a command from the defrosting control means. When the cloud is closed and the fog detecting means detects the fog on the windshield, the damper control means opens at least the windshield outlet damper, and the blower is stopped by a command from the defrost control means. A heat pump type air conditioner for an automobile, comprising: a blower control means for operating the blower when the fog detecting means detects the windshield fog during defrosting.