JPH05193343A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To prevent a malodor after starting air-conditioning without imparting a feeling of physical disorder to an occupant. CONSTITUTION:A bypass duct 11 for bypassing a coolant evaporator 6 arranged in a duct 2 is provided in the duct 2 for supplying ventilation air into a vehicle cabin. Air induced into the duct 2 is discharged into the vehicle cabin through the bypass duct 11 from the time when an air conditioning switch is turned ON to the specified time elapses by operation of a closing damper 12 for opening and closing a core surface of the coolant evaporator 6 and a closing damper 13 for opening and closing the bypass duct 11, and after the specified time elapses, cooled by passing through the coolant evaporator 6 to be discharged into the vehicle cabin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner.

[0002]

2. Description of the Related Art In an air conditioner for a vehicle, a refrigeration cycle is started by turning on an air conditioning switch, and a blower is operated to blow air into a vehicle compartment. However, immediately after the start of the refrigeration cycle, since the evaporator is still warm, the foul odor generated from the evaporator is released into the passenger compartment as the air is blown, which gives an occupant a discomfort. Therefore, in the related art, after the air conditioning switch is turned on, the air blowing is stopped for a predetermined time, and the air blowing is started after the evaporator is cooled to prevent the bad smell from being emitted into the vehicle interior.

[0003]

However, in the above method, since the air is not blown into the passenger compartment even though the air-conditioning switch is turned on, there is no feeling of cool air due to the air blow, which gives the occupant an uncomfortable feeling. The present invention has been made based on the above circumstances, and an object thereof is to prevent a bad odor immediately after the start of air conditioning without causing the passenger to feel uncomfortable.

[0004]

In order to achieve the above object, the present invention provides a duct for introducing blown air to an air outlet opening in a vehicle compartment, and a duct arranged in the duct for cooling the passing air. A heat exchanger for cooling, a bypass passage that bypasses the heat exchanger for cooling and connects the upstream side and the downstream side of the heat exchanger for cooling, and air introduced into the duct is used for the cooling. An air passage switching unit that closes one of the air passages that pass through a heat exchanger and reaches the air outlet and the air passage that flows through the bypass passage and reaches the air outlet is provided. To make it an effective means.

[0005]

In the vehicle air conditioner of the present invention having the above structure, the air passage switching means closes the air passage that passes through the cooling heat exchanger and reaches the air outlet, and is introduced into the duct. The air flows through the bypass passage and is guided to the air outlet. Further, the air introduced into the duct passes through the cooling heat exchanger and is guided to the outlet by closing the air passage that flows through the bypass passage and reaches the outlet. Therefore, immediately after the start of cooling, when the cooling heat exchanger is not yet cooled, the air introduced into the duct is closed by blocking the ventilation passage that passes through the cooling heat exchanger and reaches the air outlet. Is
It is guided to the air outlet and discharged into the passenger compartment without passing through the cooling heat exchanger. After the cooling heat exchanger is cooled, the air introduced into the duct is cooled when passing through the cooling heat exchanger by closing the ventilation passage that flows through the bypass passage to the outlet. , Is discharged from the air outlet into the passenger compartment.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle air conditioner of the present invention will be described based on an embodiment shown in the drawings. FIG. 1 is an overall cross-sectional view of a vehicle air conditioner. The vehicle air conditioner 1 includes a duct 2 for sending air toward the passenger compartment. At the upstream end of the duct 2, an inside air inlet and an outside air inlet (both not shown) for introducing air into the duct 2 are formed, and one of the inlets is an inside / outside air switching damper (not shown). Is blocked by. The downstream end of the duct 2 is communicated with a plurality of air outlets (not shown) opening into the vehicle compartment through the branch ducts 3 and 4. In the duct 2, a blower 5 for generating an air flow and a refrigerant evaporator 6 for a refrigeration cycle are provided.
(Heat exchanger for cooling according to the present invention), a heater core 7 that uses engine cooling water as a heat source is housed, and the heater core 7
An air mix damper 8 for adjusting the amount of air blown to the air duct and open / close dampers 9, 10 for opening / closing the respective branch ducts 3, 4 are provided.

A bypass duct 11 (a bypass passage of the present invention), which bypasses the refrigerant evaporator 6 and connects the upstream side and the downstream side of the refrigerant evaporator 6 to each other, is branched and connected to the duct 2. The bypass duct 11 is provided outside the duct 2 and has an upstream opening opening on the side surface of the duct 2 upstream of the refrigerant evaporator 6 and a downstream opening downstream of the refrigerant evaporator 6 (from the heater core 7). It is opened on the side surface of the duct 2 (upstream). In this vehicle air conditioner 1, the air introduced into the duct 2 by the operation of the blower 5 passes through the refrigerant evaporator 6 and reaches the outlet, and the bypass duct 11 reaches the outlet. The ventilation path is configured,
One of the ventilation passages is provided so as to be closed by the ventilation passage switching means described below.

The ventilation passage switching means includes an opening / closing damper 12 for opening / closing the upstream core surface of the refrigerant evaporator 6, and the opening / closing damper 1.
And an opening / closing damper 13 that opens and closes the bypass duct 11 in conjunction with 2. The open / close damper 12 and the open / close damper 13 are
The opening / closing damper 12 is driven by a control device (not shown).
When the upstream core surface of the refrigerant evaporator 6 is closed by the opening / closing damper 13, the opening / closing damper 13 opens the bypass duct 11, and the opening / closing damper 1 is opened.
When 2 opens the upstream core surface of the refrigerant evaporator 6, the opening / closing damper 13 is controlled to close the bypass duct 11.

Next, the opening / closing damper 12 and the opening / closing damper 1
The operation of this embodiment for performing the control No. 3 will be described based on the flowchart shown in FIG. First, when an air conditioning switch (not shown) is turned on (step S1) to set the cooling mode, the opening / closing damper 12 is driven to the side that closes the core surface of the refrigerant evaporator 6, and the opening / closing damper 13 opens the bypass duct 11. Is driven (step S2). And the blower 5
And the refrigeration cycle is started (step S3). The air (outside air) introduced into the duct 2 by the operation of the blower 5 is guided to the downstream side of the refrigerant evaporator 6 through the bypass duct 11 without passing through the refrigerant evaporator 6, and the selected outlet port. Is discharged into the passenger compartment.

A predetermined time (for example, 8 seconds) has passed since the refrigeration cycle was started (step S4), and the refrigerant evaporator 6
Is sufficiently cooled, the opening / closing damper 12 is driven to open the core surface of the refrigerant evaporator 6, and the opening / closing damper 13 is driven to close the bypass duct 11 (step S5).
As a result, the air (outside air) introduced into the duct 2 by the operation of the blower 5 is cooled when passing through the refrigerant evaporator 6, and is discharged into the vehicle compartment from the selected outlet. Then, the vehicle interior temperature Tr and the vehicle exterior temperature Tam are compared (step S6), and when the vehicle interior temperature Tr is higher (YES).
Is set to the outside air mode (step S7), and when the vehicle outside temperature Tam is higher (NO), the inside air mode is set (step S8) to perform the cooling operation by the inside air circulation.

In this embodiment, as described above, the outside air introduced into the duct 2 does not pass through the refrigerant evaporator 6 for a predetermined time after the air-conditioning switch is turned on, and the outside air enters the passenger compartment from the outlet. Since the refrigerant is discharged, it is possible to prevent the malodor generated when the refrigerant evaporator 6 is warm from being discharged into the vehicle compartment together with the blown air. Further, at this time, unlike the conventional case, the ventilation is not stopped for a predetermined time, and the occupant can be given a feeling of cool air due to the ventilation, so that the ventilation is performed despite the air conditioning switch being turned on. It is possible to eliminate discomfort caused by the absence. After the start of the cooling operation, when the vehicle interior temperature Tr becomes lower than the vehicle exterior temperature Tam, by switching to the inside air mode, the suction temperature of the blower 5 becomes lower, so that an effective cooling operation is performed. You can

Next, a second embodiment of the present invention will be described. FIG. 3 is an overall sectional view of the vehicle air conditioner 1. In this embodiment, the downstream side opening of the bypass duct 11 is opened on the side surface of the duct 2 downstream of the heater core 7, as shown in FIG. Further, an opening / closing damper 15 that opens / closes a bypass 14 that bypasses the heater core 7 in the duct 2 is provided as the ventilation path switching means. Therefore, when the air-conditioning switch is turned on, the open / close damper 15 is closed by the bypass 14 while the air mix damper 8 closes the core surface of the heater core 7.
And the opening / closing damper 13 opens the bypass duct 11, whereby the air introduced into the duct 2 is guided to the downstream side of the heater core 7 through the bypass duct 11 without passing through the refrigerant evaporator 6. The air is discharged from the selected outlet into the passenger compartment. After a lapse of a predetermined time, the opening / closing damper 15 opens the bypass 14, and the opening / closing damper 13 opens the bypass duct 1.
When 1 is closed, the air introduced into the duct 2 is cooled when passing through the refrigerant evaporator 6, and is discharged into the vehicle compartment from the selected outlet. As a result, the same effect as that of the first embodiment can be obtained. In this embodiment, the opening / closing damper 15 is provided as the ventilation passage switching means.
Instead of the opening / closing damper 15, an opening / closing damper 12 for opening / closing the core surface of the refrigerant evaporator 6 shown in the first embodiment may be provided.

Next, a third embodiment of the present invention will be described. FIG. 4 is an overall sectional view of the vehicle air conditioner 1. In the present embodiment, instead of providing the bypass duct 11 shown in the first and second embodiments, as shown in FIG. 4, a bypass passage 16 bypassing the refrigerant evaporator 6 in the duct 2 (of the present invention A bypass passage is formed, and a ventilation passage switching damper 17 that closes either the bypass passage 16 or the core surface of the refrigerant evaporator 6 is provided as the ventilation passage switching means. In the case of the present embodiment, when the air conditioning switch is turned on, the ventilation passage switching damper 17 closes the core surface of the refrigerant evaporator 6 and opens the bypass passage 16, so that the air introduced into the duct 2 becomes the refrigerant. The gas is discharged into the vehicle compartment from the selected outlet through the bypass 16 without passing through the evaporator 6. After the elapse of a predetermined time, the ventilation passage switching damper 17 closes the bypass passage 16 and opens the core surface of the refrigerant evaporator 6, so that when the air introduced into the duct 2 passes through the refrigerant evaporator 6. It is cooled and discharged from the selected outlet into the passenger compartment. As a result, it is possible to prevent a bad odor after the start of air conditioning, and it is possible to eliminate the uncomfortable feeling given to the passenger.

Next, a fourth embodiment of the present invention will be described. FIG. 5 is an overall sectional view of the vehicle air conditioner 1, and FIG. 6 is a sectional view of the air outlet. In the present embodiment, the downstream side opening of the bypass duct 11 forming the bypass passage of the present invention communicates with the branch duct 3 as shown in FIG. 6, a center vent outlet 18 (other than the center vent outlet 18). It is opened on both sides (may be only one side). At the downstream opening of the bypass duct 11, the bypass duct 11
An opening / closing damper 13 for opening and closing is provided. Further, in the case of the present embodiment, the opening / closing dampers 9 and 10 for opening / closing the respective branch ducts 3 and 4 function as the ventilation path switching means together with the opening / closing damper 13. Therefore, when the air conditioning switch is turned on, the opening / closing dampers 9 and 10 cause the branch duct 3 and
4 is closed, and the opening / closing damper 13 opens the bypass duct 11, so that the air introduced into the duct 2 passes through the bypass duct 11 without passing through the refrigerant evaporator 6 and is discharged from the center vent outlet 18. It is discharged into the passenger compartment.
After the elapse of a predetermined time, the opening / closing damper 13 is replaced by the bypass duct 1.
1 is closed and the opening / closing damper 9 opens the branch duct 3 so that the air introduced into the duct 2 is cooled when passing through the refrigerant evaporator 6 and discharged from the center vent outlet 18 into the vehicle interior. To be done. As a result, as in the above-described embodiment, it is possible to prevent a bad odor and eliminate the occupant's discomfort. In the first embodiment, the opening / closing damper 12 and the opening / closing damper 13 are drive-controlled through the control device. It is also possible to drive by.

[0015]

According to the present invention, since the air bypassing the refrigerant evaporator is discharged into the passenger compartment for a predetermined time after the air conditioning switch is turned on, it is possible to prevent a bad odor after the start of air conditioning and at the same time as in the conventional case. It is possible to eliminate the uncomfortable feeling caused by the fact that the air is not blown into the vehicle interior despite the air conditioning switch being turned on.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view of a vehicle air conditioner.

FIG. 2 is a flowchart showing the operation of this embodiment.

FIG. 3 is an overall sectional view of a vehicle air conditioner showing a second embodiment of the present invention.

FIG. 4 is an overall sectional view of a vehicle air conditioner showing a third embodiment of the present invention.

FIG. 5 is an overall sectional view of a vehicle air conditioner showing a fourth embodiment of the present invention.

6 is a cross-sectional view of the air outlet of the vehicle air conditioner shown in FIG.

[Explanation of symbols]

 1 Air Conditioner for Vehicle 2 Duct 6 Refrigerant Evaporator (Heat Exchanger for Cooling) 11 Bypass Duct (Bypass Passage) 12 Opening / Closing Damper (Ventilation Channel Switching Means) 13 Opening / Closing Damper (Ventilation Channel Switching Means) 15 Opening / Closing Damper (Ventilation Channels) Switching means) 16 Bypass passage (bypass passage) 17 Ventilation passage switching damper (ventilation passage switching means) 18 Center vent outlet

Claims (1)

[Claims] 1. A duct for guiding blown air to an air outlet opening in a vehicle compartment; b) a cooling heat exchanger arranged in the duct to cool passing air; and c) for cooling. A bypass passage that bypasses the heat exchanger and connects the upstream side and the downstream side of the cooling heat exchanger, and d) the air introduced into the duct passes through the cooling heat exchanger, and An air conditioner for a vehicle, comprising: an air passage leading to an air outlet and an air passage switching means for closing one of the air passages flowing through the bypass passage and reaching the air outlet.