JP2007112301A - Air conditioner for vehicular rear seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heating effect in an air conditioner for a vehicular rear seat. <P>SOLUTION: When inside temperature Tr is less than the set temperature of a temperature setting switch (a step 110:NO), an electronic control device 30 controls a servo motor 9b to rotate a shielding door 9a, fully close an air blow-off port of a cooling heat exchanger 9, and fully open an air blow-off port of a ventilating bypass passage 2a (a step 130). Therefore, all of air blowing out from a blower 8 is brown off toward a heating heat exchanger 15 and a bypass passage 16 through the ventilating bypass passage 2a. Therefore, even if a solenoid valve adjusting a flow rate of refrigerant flowing into the cooling heat exchanger 9 is not used, air temperature on an inlet side of the heating heat exchanger 15 can be raised, and heating effect can be improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicular rear seat air conditioner that air-conditions a rear seat side space in a vehicle interior.

  Conventionally, in a vehicular rear seat air conditioner, a cooling heat exchanger that cools air blown from a blower, a heating heat exchanger that heats air cooled by the cooling heat exchanger, and the heating There is a bypass passage that bypasses the heat exchanger, and the air that has passed through the heating heat exchanger and the air that has passed through the bypass passage are mixed and blown out from the air outlet into the vehicle interior.

  In this configuration, like the refrigeration cycle apparatus 10 shown in FIG. 6, the cooling heat exchanger 9 is arranged in parallel with the front seat cooling heat exchanger 9 </ b> A with respect to the refrigerant flow from the compressor 11. Yes. An electromagnetic valve 9B is arranged on the upstream side of the refrigerant flow of the cooling heat exchanger 9, and the electromagnetic valve 9B adjusts the amount of refrigerant flowing into the cooling heat exchanger 9 to thereby perform heat exchange for cooling. The cooling capacity of the device 9 is adjusted.

  For example, when heating is performed in winter or the like, when the room temperature is low, the cooling capacity of the heat exchanger 9 for cooling is limited by the solenoid valve 9B, and the temperature on the inlet side of the heat exchanger for heating, and thus the temperature of the air blown from the outlet is The temperature is maintained above a certain temperature.

Further, in the vehicle air conditioner, a bypass passage is provided to flow a part of the blown air from the blower bypassing the cooling heat exchanger, and a part of the blown air from the blower is not passed through the cooling heat exchanger. There is what supplies to the heat exchanger for heating (for example, refer to patent documents 1).
JP 7-276971 A

  In order to reduce costs, the present inventor studied to configure a vehicular rear seat air conditioner without using the electromagnetic valve 9B for adjusting the flow rate of the refrigerant flowing into the cooling heat exchanger 9.

  In this case, if the solenoid valve 9B is not used, the refrigerant always flows into the cooling heat exchanger 9 while the compressor 11 is in operation, and thus the cooling capacity of the cooling heat exchanger 9 cannot be limited. For this reason, the inlet side temperature of the heat exchanger for heating, and consequently the temperature of air blown from the outlet, becomes extremely low, and the heating performance deteriorates.

  On the other hand, if a part of the blown air from the blower is supplied to the heating heat exchanger without passing through the cooling heat exchanger as in the air conditioner described in Patent Document 1 described above, the heat exchange for heating is performed. Although the inlet side temperature of the heater can be raised, when the indoor air temperature is extremely low, the inlet side temperature of the heating heat exchanger cannot be raised to a desired temperature or higher.

  In view of the above, the present invention provides a vehicle that can further increase the air temperature on the inlet side of a heating heat exchanger without using a solenoid valve for adjusting the flow rate of refrigerant flowing into the cooling heat exchanger. An object is to provide a rear seat air conditioner.

  In order to achieve the above-mentioned object, the present invention supports a displaceable fan bypass passage (2a) that bypasses the rear seat cooling heat exchanger and flows the air blown from the blower toward the heating heat exchanger. And a blow control door (9a, 9c, 9d) that prevents the blown air from the blower from flowing into the rear seat cooling heat exchanger and flows all of the blown air from the blower to the blow bypass passage, Driving means (9b) for displacing the air blowing control door, and when the air temperature on the rear seat side of the passenger compartment is lower than a predetermined temperature during heating operation, the driving means is controlled to remove all the air blown from the blower. And a control means (30) for displacing the air blow control door so as to flow in the air blow bypass passage.

  Therefore, all of the blown air from the blower can flow toward the heating heat exchanger through the blower bypass passage without using a solenoid valve for adjusting the flow rate of the refrigerant flowing into the cooling heat exchanger. The air temperature on the inlet side of the heating heat exchanger can be increased, and the heating effect can be improved.

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
FIG. 1 shows an outline of the overall configuration of the present embodiment. A vehicular rear seat air conditioner includes an indoor air conditioning unit 1 disposed on the rear side of a rear seat in a vehicle interior.

  The indoor air conditioning unit 1 has an air conditioning casing 2, and an inside air inlet 3 is provided at the most upstream part of the air conditioning casing 2. An electric blower 8 that blows air toward the passenger compartment is disposed downstream of the inside air inlet 3. The blower 8 drives a centrifugal impeller 8a by a motor 8b. A cooling heat exchanger 9 is arranged on the downstream side of the blower 8. The cooling heat exchanger 9 corresponds to a rear seat cooling heat exchanger described in the claims.

  As shown in FIG. 2, the cooling heat exchanger 9 constitutes a well-known refrigeration cycle device 10 in which the refrigerant discharged from the compressor 11 circulates, and the cooling heat exchanger 9 is in operation of the compressor 11. Always flows in the refrigerant, evaporates and absorbs heat from the blown air from the blower 8.

  Here, the refrigeration cycle apparatus 10 includes a cooling heat exchanger 9, a front seat cooling heat exchanger 9 </ b> A, a compressor 11, a condenser 12, and an expansion valve 14. , 9A are arranged in parallel with the refrigerant flow discharged from the compressor 11. The front seat cooling heat exchanger 9A is used in a front seat air conditioner that air-conditions the front seat side space in the passenger compartment.

  The compressor 11 receives the rotational power of the traveling engine via the electromagnetic clutch 11a and compresses the refrigerant. The electromagnetic clutch 11 a connects or disconnects between the traveling engine E and the compressor 11.

  In addition, as shown in FIG. 1, the air conditioning casing 2 is provided with a blower bypass passage 2a for flowing the blown air from the blower 8 by bypassing the cooling heat exchanger 9, and is downstream of the blower bypass passage 2a. Is provided with a shielding door 9a that is rotatably supported. The angle of the shielding door 9a is adjusted by a servo motor 9b. The shielding door 9a corresponds to the air blowing control door described in the claims, and the servo motor 9b corresponds to the driving means described in the claims.

  When the shielding door 9a is disposed at the first position (position a in FIG. 1), the air outlet of the cooling heat exchanger 9 is fully closed, and the air outlet of the blower bypass passage 2a is fully opened. . When the shielding door 9a is arranged at the second position (position b in FIG. 1), the air outlet of the cooling heat exchanger 9 is fully opened, and the air outlet of the ventilation bypass passage 2a is fully closed. .

  A heating heat exchanger 15 is disposed on the downstream side of the cooling heat exchanger 9. The heating heat exchanger 15 heats the air that has passed through the ventilation bypass passage 2a and the cooling heat exchanger 9 by using the traveling engine cooling water as a heat source. A bypass passage 16 is formed in a side portion of the heating heat exchanger 15, and air that bypasses the heating heat exchanger 15 flows through the bypass passage 16. The bypass passage 16 corresponds to the cold air bypass passage described in the claims.

  An air mix door 17 that is rotatably supported is disposed on the upstream side of the heating heat exchanger 15. The opening (angle) of the air mix door 17 is adjusted by a servo motor 18. The ratio of the amount of air passing through the heating heat exchanger 15 (warm air amount) and the amount of air passing through the bypass passage 16 and bypassing the heating heat exchanger 15 (cold air amount) depending on the opening of the air mix door 17 By adjusting, the temperature of the air blown out into the passenger compartment is adjusted.

  In the most downstream part of the air passage of the air-conditioning casing 2, a face outlet 20 for blowing air-conditioning air toward the passenger's face of the rear seat, and air-conditioning air for blowing off the passenger's feet of the rear seat A foot outlet 21 is provided.

  Here, a face door 23 and a foot door 24 that are rotatably supported are disposed upstream of the air outlets 20 and 21, respectively. The doors 23 and 24 are opened and closed by a common servo motor 25 via a link mechanism (not shown).

  Next, the electrical configuration of the vehicle rear seat air conditioner of the present embodiment will be described.

  As shown in FIG. 1, the vehicular rear seat air conditioner includes an electronic control unit 30 that serves as a control means. The electronic control unit 30 includes a microcomputer, a timer, a counter, and the like. The air outlets 20 and 21 are based on operation signals from the switch group of the air conditioning operation panel 37 and detection signals of the sensor groups 31 to 35. The target air temperature TAO to be blown out is calculated, and the electromagnetic clutch 11a, the servo motors 9b, 18, 25, and the blower 8 are controlled based on the TAO, each operation signal, and each detection signal.

  Here, TAO is an air temperature that is blown out from the air outlets 20 and 21 so that the air temperature in the vehicle interior maintains the set temperature of the temperature setting switch regardless of the environmental change in the vehicle interior.

  The sensor groups 31 to 35 detect the outside air temperature sensor 31 that detects the outside air temperature Tam, the inside air temperature sensor 32 that detects the inside air temperature Tr (air temperature) on the rear seat side of the vehicle interior, and the amount of solar radiation Ts that enters the vehicle interior. The solar radiation sensor 33, the evaporator blown air temperature sensor 34 that is disposed in the air blowout part of the cooling heat exchanger 9 and detects the evaporator blown air temperature Te, and the engine coolant temperature Tw flowing into the heating heat exchanger 15 It comprises a cooling water temperature sensor 35 to be detected.

  The air conditioning operation panel 37 includes a rear air conditioner switch for starting operation of the rear seat air conditioner and a temperature setting switch for setting the air temperature on the rear seat side of the vehicle interior.

  Next, the operation of this embodiment will be described. When the ignition switch IG is turned on, the electronic control unit 30 alternately executes the air conditioning control process and the shielding door control process.

  The air conditioning control process is a well-known control process that controls the electromagnetic clutch 11a, the servo motors 18 and 25, and the motor 8b of the blower 8 to cool or heat the rear seat side of the vehicle interior. Hereinafter, the shielding door control process will be described.

  The electronic control unit 30 executes the shielding door control process according to the flowchart shown in FIG.

  First, in step 100, it is determined whether or not the rear air conditioner switch is turned on. When the rear air conditioner switch is on, it is determined as YES and the process proceeds to the next step 105 to determine whether or not the heating operation is in operation. For example, when TAO is equal to or higher than a certain temperature, it is determined that the heating operation is in operation and YES is determined in step 105.

  In the next step 110, it is determined whether or not the internal air temperature Tr detected by the internal air temperature sensor 32 is equal to or higher than the set temperature of the temperature setting switch. The set temperature of the temperature setting switch corresponds to the predetermined temperature described in the claims.

  For example, when the air temperature in the passenger compartment is extremely low and the internal air temperature Tr is lower than the set temperature of the temperature setting switch, such as in the early morning of winter, NO is determined in step 110 and the process proceeds to step 130. Here, the servo motor 9b is controlled to rotate the shielding door 9a, so that the air outlet of the cooling heat exchanger 9 is fully closed and the air outlet of the ventilation bypass passage 2a is fully opened.

  For this reason, all the air blown out from the blower 8 passes through the blower bypass passage 2 a, and the passed air flows into the heating heat exchanger 15 and the bypass passage 16. Then, the air that has passed through the bypass passage 16 and the air that has passed through the heating heat exchanger 15 are mixed and blown out from one of the air outlets 20 and 21 to the rear seat side of the vehicle interior.

  Thereafter, if it is determined in step 140 that the rear air conditioner switch is turned on, the process returns to step 105. Thereafter, as long as the heating operation and the on-state of the rear air conditioner switch are maintained and the internal temperature Tr is lower than the set temperature of the temperature setting switch, the heating determination (step 105), the room temperature determination (step 110), and the heat exchange for cooling are performed. The air outlet fully closed (step 130) and the rear air conditioner switch ON determination (step 140) are repeated.

  Thereafter, when the passenger compartment air temperature rises and the inside air temperature Tr becomes equal to or higher than the temperature set by the temperature setting switch, YES is determined in step 110. Accordingly, in step 120, the servo motor 9b is controlled to rotate the shield door 9a, so that the air outlet of the cooling heat exchanger 9 is fully opened, and the air outlet of the ventilation bypass passage 2a is fully closed. .

  For this reason, all of the air blown out from the blower 8 passes through the cooling heat exchanger 9, and the passed cold air flows into at least one of the heating heat exchanger 15 and the bypass passage 16. Then, the cold air that has passed through the bypass passage 16 and the hot air that has passed through the heating heat exchanger 15 are mixed and blown out from one of the air outlets 20 and 21 to the rear seat side of the vehicle interior.

  When TAO is lower than a certain temperature in step 105, it is determined that the cooling operation is in operation and NO is determined, and the process proceeds to step 120.

  According to the embodiment described above, the electronic control unit 30 controls the servo motor 9b to rotate the shielding door 9a when the internal temperature Tr is lower than the set temperature of the temperature setting switch during the heating operation. Then, the air outlet of the cooling heat exchanger 9 is fully closed, and the air outlet of the ventilation bypass passage 2a is fully opened. For this reason, all of the air blown out from the blower 8 passes through the blower bypass passage 2 a and is blown out toward the heat exchanger 15 for heating and the bypass passage 16.

  Therefore, the air temperature on the inlet side of the heating heat exchanger 15 can be increased without using a solenoid valve for adjusting the flow rate of the refrigerant flowing into the cooling heat exchanger 9, and the heating effect can be improved. .

  In the first embodiment described above, the air temperature on the rear seat side of the vehicle interior detected by the internal air temperature sensor 32 is used to set the temperature of the rear seat side in the vehicle interior during the heating operation. Although it was determined whether or not the temperature is lower than a predetermined temperature, the present invention is not limited to this, and an air temperature sensor that detects the air temperature upstream of the heating heat exchanger 15 is added to detect the air temperature sensor. The temperature may be used to determine whether or not the air temperature on the rear seat side of the vehicle compartment is lower than the set temperature (predetermined temperature) of the temperature setting switch during the heating operation.

(Second Embodiment)
In the first embodiment described above, the example in which the shielding door is provided on the downstream side of the cooling heat exchanger has been described. Instead, in the second embodiment, the shielding door is provided upstream of the cooling heat exchanger. Provide on the side. The configuration of the indoor air conditioning unit in this case is shown in FIG.

  In this embodiment, instead of the shielding door 9a of the first embodiment described above, shielding doors 9c and 9d that are rotatably supported are provided.

  When the shielding door 9c is arranged at the first position (position c in FIG. 1), the lower half of the air intake port of the cooling heat exchanger 9 shown in the drawing (that is, the half on the air bypass passage 2a side) It closes and the air inlet port of the ventilation bypass passage 2a is fully opened. When the shielding door 9c is arranged at the second position (position d in FIG. 1), the lower half of the air suction port of the cooling heat exchanger 9 is opened, and the air suction of the ventilation bypass passage 2a is performed. Close your mouth completely.

  When the shielding door 9d is disposed at the first position (position f in FIG. 1), the upper half of the air intake port of the cooling heat exchanger 9 shown in the drawing (that is, the other half on the opposite side of the blower bypass passage 2a) Close. When the shielding door 9c is arranged at the second position (position e in FIG. 1), the air intake port of the cooling heat exchanger 9 is fully opened.

  Further, a wind direction adjusting door 9e that is rotatably supported is provided on the downstream side of the ventilation bypass passage 2a. When the air direction adjusting door 9e is disposed at the first position (position g in FIG. 1), the air blowing direction from the blower bypass passage 2a is directed to the heating heat exchanger 15 and the bypass passage 16. When the wind direction adjusting door 9e is disposed at the second position (position h in FIG. 1), the air outlet of the blower bypass passage 2a is fully closed. The doors 9b, 9c, 9e are rotationally driven by a common servo motor 9b via a link mechanism (not shown).

  The shielding doors 9b and 9c correspond to the air blowing control door described in the claims, and the servo motor 9b corresponds to each of the driving means and the wind direction adjusting driving means described in the claims.

  Next, the operation of this embodiment will be described. The electronic control device 30 of the present embodiment executes the shielding door control process according to the flowchart of FIG. 5 instead of the flowchart of FIG.

  In this shielding door control process, it is determined that the rear air conditioner switch is turned on (step 100: YES), and it is determined that the heating operation is in operation (step 105: YES), as in the first embodiment. If it is determined in step 110 that the inside air temperature Tr is lower than the set temperature of the temperature setting switch, the process proceeds to step 130 where the servo motor 9b is controlled to rotate the doors 9c, 9d, and 9e.

  As a result, the air suction port of the cooling heat exchanger 9 is fully closed by the doors 9c and 9d, and the air suction port of the blower bypass passage 2a is fully opened. Furthermore, the air blowing direction from the ventilation bypass passage 2a is directed to the heating heat exchanger 15 and the bypass passage 16 by the door 9e. For this reason, all of the blown air from the blower 8 passes through the blower bypass passage 2 a, and the passed air is blown out toward the heat exchanger 15 for heating and the bypass passage 16.

  If NO is determined in step 110 that the internal temperature Tr is equal to or higher than the set temperature of the temperature setting switch, the process proceeds to step 120 where the servo motor 9b is controlled to rotate the shielding doors 9c, 9d, and 9e.

  As a result, the air intake port of the cooling heat exchanger 9 is fully opened by the doors 9c and 9d, and the air intake port of the blower bypass passage 2a is fully closed. Furthermore, the air outlet of the ventilation bypass passage 2a is fully closed by the door 9e.

  Along with this, all of the blown air from the blower 8 passes through the cooling heat exchanger 9, and the passed air is blown out toward the heating heat exchanger 15 and the bypass passage 16.

  When TAO is lower than a certain temperature in step 105, it is determined that the cooling operation is in operation and NO is determined, and the process proceeds to step 120.

  According to the present embodiment described above, the electronic control unit 30 controls the servo motor 9b to rotate the doors 9c and 9d during the heating operation to fully close the air intake port of the cooling heat exchanger 9. And the air inlet of the ventilation bypass passage 2a is fully opened. For this reason, like the above-mentioned 1st Embodiment, all the air blown off from the air blower 8 passes through the ventilation bypass passage 2a, and is blown out toward the heat exchanger 15 for heating, and the bypass passage 16.

  Therefore, the air temperature on the inlet side of the heating heat exchanger 15 can be increased without using a solenoid valve for adjusting the flow rate of the refrigerant flowing into the cooling heat exchanger 9, and the heating effect can be improved. .

  If the air direction adjusting door 9e is not used, a part of the air blown out from the blower bypass passage 2a is blown out to the downstream portion of the cooling heat exchanger 9, and the blown air is used as the cooling heat exchanger. The air cooled by 9 flows into the heating heat exchanger 15.

  On the other hand, according to this embodiment, since the air blowing direction from the blower bypass passage 2a is directed to the heat exchanger 15 for heating and the bypass passage 16 by the wind direction adjusting door 9e, the blower bypass passage 2a. Can be prevented from being blown out to the downstream portion of the heat exchanger 9 for cooling.

(Other embodiments)
In each of the above-described embodiments, an example in which the door 9a (9c, 9d) that is rotatably supported is used as a door for preventing the air blown from the blower 8 from flowing into the cooling heat exchanger 9 will be described. However, the present invention is not limited to this, and a sliding door supported so as to be slidable may be used.

It is a mimetic diagram showing the whole composition of a 1st embodiment concerning the backseat air-conditioner for vehicles of the present invention. It is a figure which shows the structure of the refrigeration cycle apparatus of the above-mentioned 1st Embodiment. It is a flowchart which shows the control processing of the electronic controller of 1st Embodiment mentioned above. It is a schematic diagram which shows the whole structure of 2nd Embodiment which concerns on the vehicle rear seat air conditioner of this invention. It is a flowchart which shows the control processing of the electronic controller of 1st Embodiment mentioned above. It is a figure which shows the structure of the conventional refrigeration cycle apparatus.

Explanation of symbols

2a ... ventilation bypass passage, 9b ... servo motor, 9a ... shielding door,
9 ... Heat exchanger for cooling, 15 ... Heat exchanger for heating, 16 ... Bypass passage,
30: Electronic control unit.

Claims (3)

An air conditioning casing (2);
A blower (8) disposed in the air conditioning casing and for blowing air toward the vehicle interior;
A refrigeration cycle device in which refrigerant discharged from the compressor circulates is arranged in parallel with the front-seat cooling heat exchanger (9A) with respect to the flow of refrigerant discharged from the compressor, and the compression The rear-seat cooling heat exchanger (9) in which the refrigerant always flows while the machine is operating, absorbs heat from the blown air from the blower, and evaporates the refrigerant;
A heating rear heat exchanger (15) disposed in the air conditioning casing and configured to heat the air that has passed through the rear seat cooling heat exchanger;
A ventilation bypass passage (2a) that is provided in the air conditioning casing, bypasses the rear seat cooling heat exchanger and flows the blown air from the blower toward the heating heat exchanger;
A blower control door that is supported so as to be displaceable and prevents the blown air from the blower from flowing into the rear seat cooling heat exchanger and flows all of the blown air from the blower to the blower bypass passage ( 9a, 9c, 9d)
Drive means (9b) for displacing the air blowing control door;
When the air temperature on the rear seat side of the vehicle interior is lower than a predetermined temperature during heating operation, the air flow control is performed such that the driving means is controlled to flow all the air blown from the blower to the air flow bypass passage. Control means (30) for displacing the door;
A vehicular rear seat air conditioner comprising: A wind direction adjusting door (9e), which is rotatably supported and adjusts the blowing direction of the air from the ventilation bypass passage (2a);
Wind direction adjusting drive means (9b) for rotating the wind direction adjusting door;
A cooling air bypass passage (16) for flowing the air that has passed through the rear-seat cooling heat exchanger and the ventilation bypass passage, bypassing the heating heat exchanger, and
The control means controls the wind direction adjusting drive means during the heating operation so that the air from the blower bypass passage (2a) is sent to the heating heat exchanger (15) and the cold air bypass passage (16). The vehicular rear seat air conditioner according to claim 1, wherein the wind direction adjusting door (9e) is rotated so as to blow out toward the vehicle. An inside air sensor (32) for detecting the air temperature on the rear seat side of the vehicle interior;
When the detected temperature of the inside air sensor is lower than a predetermined temperature, the control means controls the driving means so that all of the blown air from the blower is caused to flow through the blower bypass passage by the blower control door,
Further, when the temperature detected by the inside air sensor is equal to or higher than a predetermined temperature, the control means drives the driving air flow so that all the air blown from the blower is caused to flow to the rear seat cooling heat exchanger by the air blowing control door. The vehicle rear seat air conditioner according to claim 1 or 2, wherein the means is controlled.

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