Air conditioning unit for vehicle

Abstract

An air conditioning unit for a vehicle includes: a first channel and a second channel; a blower unit including a first blower fan and a second blower fan that rotate together through a common rotating shaft and a driving unit; a bypass channel; and a control door disposed between an outlet of the first channel and an outlet of the second channel, a heating core, and the bypass channel to control air discharged from the first channel or the second channel to pass through the heating core, or to pass through the bypass channel without passing through the heating core.

Description

Technical Field

[0001] The present disclosure relates to an air conditioning unit for a vehicle. The air conditioning unit performs cooling / heating while switching air passages without using a heat pump system that changes refrigerant. Unlike existing air conditioning systems, the air conditioning unit integrates a blower motor by integrating a cooling system and a heating system. Background Art

[0002] Because there is no specific heat source (such as an engine), electric vehicles need to use electrical energy for heating. To solve this problem, heat pump systems are used in the prior art. These systems have complex refrigerant / cooling water channels and are inefficient.

[0003] Therefore, a system has been developed which maintains the refrigerant circuit as a one-way circuit and uses the cold air from the evaporator or the hot air from the condenser as needed.

[0004] However, the system also has complicated channels and doors for selecting air supplied to the vehicle interior and exhausting air to the outside of the vehicle, and each channel requires a blower fan, which increases the weight and volume of the system.

[0005] The above description is provided as a related art of the present disclosure to help understand the background of the present disclosure, and should not be construed as being included in the related art known to a person of ordinary skill in the art. Summary of the invention

[0006] The present disclosure is to solve the above-mentioned problems in the prior art. One aspect of the present disclosure is to provide an air conditioning unit for a vehicle. The air conditioning unit performs cooling / heating while switching air passages without using a heat pump system that changes refrigerant, and integrates a blower fan motor by integrating a cooling system and a heating system, which is different from the existing air conditioning system.

[0007] In view of the above aspects, an air conditioning unit for a vehicle may include: a first channel and a second channel, each channel having an inlet and an outlet; a blower unit including a first blower fan and a second blower fan, the first blower fan and the second blower fan are respectively arranged in the first channel and the second channel and rotate together through a common rotating shaft and a driving unit; a cooling core arranged in the first channel between the inlet of the first channel and the first blower fan; a heating core arranged at the outlet of the first channel and the outlet of the second channel; a bypass channel arranged on one side of the heating core to bypass the heating core; and a control door arranged between the outlet of the first channel, the outlet of the second channel, the heating core, and the bypass channel to control the air discharged from the first channel or the second channel to pass through the heating core, or pass through the bypass channel without passing through the heating core.

[0008] A first door communicating with the outside may be provided at an outlet of the first passage. When the first door is opened, air having passed through the cooling core may be discharged to the outside. When the first door is closed, air having passed through the cooling core may be discharged to the control door.

[0009] The second door communicating with the outside may be provided at a downstream position of the heating core. When the second door is opened, the air having passed through the heating core may be discharged to the outside. When the second door is closed, the air having passed through the heating core may be discharged to the interior of the vehicle.

[0010] The cooling core and the heating core may be an evaporator and a condenser connected by a refrigeration line, respectively. A compressor and an expansion valve may be provided in the refrigeration line.

[0011] The air conditioning unit for a vehicle may further include an intake housing and an exhaust housing coupled to a side of the intake housing. A first intake passage and a second intake passage having an inlet and an outlet, respectively, may be formed in the intake housing. A blast chamber divided into two spaces may be formed in the exhaust housing. A first blower fan and a second blower fan may be respectively disposed in the spaces of the blast chamber. The outlet of the first intake passage may be communicated with the inlet of a space in which the first blower fan is disposed, thereby forming a first passage. The outlet of the second intake passage may be communicated with the inlet of a space in which the second blower fan is disposed, thereby forming a second passage.

[0012] The cooling core may be disposed in the first air intake passage. The first blower fan may be disposed in the blower chamber close to the air intake housing. The second blower fan may be disposed in the blower chamber away from the air intake housing. The outlet of the first air intake passage may be directly connected to the first blower fan. The outlet of the second air intake passage may be connected to the second blower fan on the opposite side after bypassing the blower chamber.

[0013] The air intake housing may be coupled to one side of the exhaust housing. A drive unit for the blower unit may be coupled to the other side of the exhaust housing.

[0014] The intake housing may be divided into a first intake passage and a second intake passage by an intake partition wall. A selection door may be provided on a downstream side of the partition wall from the cooling core, so that when the selection door is opened, the first intake passage and the second intake passage may be separated. When the selection door is closed, air that has flowed through the cooling core may flow into the first blower fan and the second blower fan through the first intake passage and the second intake passage.

[0015] An exhaust chamber for discharging air into the vehicle and a mode door installed at the exhaust chamber may be provided in the exhaust housing. A core chamber having a heating core therein may be formed. An inlet of the core chamber and an inlet of the bypass channel may be provided toward an outlet of the blast chamber. A control door may be provided between an inlet of the core chamber, an inlet of the bypass channel, and an outlet of the blast chamber.

[0016] The bypass channel may be formed outside the core chamber. An outlet of the bypass channel may be connected to the exhaust chamber.

[0017] A second door connected to the outside may be provided at the outlet of the core chamber. When the second door is opened, the air that has passed through the heating core may be discharged to the outside. When the second door is closed, the air that has passed through the heating core may be discharged to the exhaust chamber.

[0018] The first door communicating with the outside may be provided at the outlet of the space in which the first blower fan is provided in the blower chamber. When the first door is opened, the air having passed through the first blower fan may be discharged to the outside. When the first door is closed, the air having passed through the first blower fan may be discharged to the control door.

[0019] According to the disclosed air conditioning unit for a vehicle, unlike an existing air conditioning system, cooling / heating can be performed while switching air passages without using a heat pump system that changes refrigerant, and a blower motor can be integrated by using the vehicle's air conditioning unit integrated cooling and heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other aspects, features and advantages of the present disclosure will become more apparent through the following detailed description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a diagram showing a structure of an air conditioning unit for a vehicle according to one embodiment of the present invention.

[0022] Figure 2 and Figure 3 is a perspective view of an air conditioning unit for a vehicle according to an embodiment of the present disclosure;

[0023] Figure 4 is along Figure 2 a cross-sectional view of an air conditioning unit for a vehicle taken along line AA;

[0024] Figure 5 is a view showing an exhaust case of an air conditioning unit for a vehicle according to an embodiment of the present disclosure;

[0025] Figure 6 and Figure 7 is a view showing one side of the inner side of an exhaust case of an air conditioning unit for a vehicle according to an embodiment of the present disclosure; and

[0026] Figure 8 and Fig. 9 is a view showing the other side of the inner side of the exhaust case of the air conditioning unit for a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] Figure 1 is a diagram showing a configuration of an air conditioning unit for a vehicle according to an embodiment of the present disclosure. Figure 2 and Figure 3 is a perspective view of an air conditioning unit for a vehicle according to an embodiment of the present disclosure. Figure 4 is along Figure 2 A cross-sectional view of an air conditioning device for a vehicle taken along line AA. Figure 5 is a view showing an exhaust case of an air conditioning unit for a vehicle according to an embodiment of the present disclosure. Figure 6 and Figure 7 is a view showing one side of the inner side of an exhaust case of an air conditioning unit for a vehicle according to an embodiment of the present disclosure. Figure 8 and Fig. 9 is a view showing the other side of the inner side of the exhaust case of the air conditioning unit for a vehicle according to an embodiment of the present disclosure.

[0028] Figure 1 is a configuration diagram showing an air conditioning unit for a vehicle according to an embodiment of the present disclosure. The air conditioning unit for a vehicle of the present disclosure includes a cooling core C and a heating core H through which a refrigerant circulates. Although the embodiment in the figure shows that the same refrigerant circulates through the cooling core C and the heating core H, the hot core may be a device for coolant flow or electric heating of the engine. Alternatively, the cooling core and the heating core may be connected to both sides of the thermoelectric element, respectively, for heat transfer.

[0029] A representative embodiment of the present disclosure is an air conditioning unit for a vehicle, which is applied to an electric vehicle, wherein Figure 1As shown, there is a line for refrigerant circulation. The cooling core C and the hot core H are arranged on the pipeline. The compressor COMP and the expansion valve EX may be arranged on the pipeline. That is, the cooling core C and the hot core H are respectively an evaporator and a condenser connected by a refrigeration line. The compressor COMP and the expansion valve EX may be included in the refrigeration line. Therefore, according to the present disclosure, unlike the existing heat pump system that switches the flow in the refrigerant / cooling water line, the refrigerant flows continuously through one line only in one direction, so the cooling core C remains cool and the hot core H remains hot. The cooling core C and the hot core H are used only as an evaporator and a condenser, respectively.

[0030] Figure 2 and Figure 3 is a perspective view of an air conditioning unit for a vehicle according to an embodiment of the present disclosure. Figure 4 is along Figure 2 A cross-sectional view of an air conditioning device for a vehicle taken along the AA line. The air conditioning unit for a vehicle according to the present disclosure includes a first channel 100 and a second channel 200, the first channel 100 and the second channel 200 having corresponding inlets 122 and 222 and corresponding outlets 140 and 240. The air conditioning unit includes a blower unit 300 including a first blower fan 320 and a second blower fan 340, the first blower fan 320 and the second blower fan 340 are respectively arranged in the first channel 100 and the second channel 200 and rotate together through a common rotation shaft and a driving unit 360. The air conditioning unit includes a cooling core C, which is arranged between the first blower fan 320 and the inlet 122 of the first channel 100 in the first channel 100. The air conditioning unit includes a heating core H, which is arranged at the outlet 140 of the first channel 100 and the outlet 240 of the second channel 200. The air conditioning unit includes a bypass channel 600, which is arranged on one side of the heating core H to bypass the heating core H. The air conditioning unit includes a control door D3, which is arranged between the outlet 140 of the first channel 100 and the outlet 240 of the second channel 200, the heating core H, and the bypass channel 600 to control the air discharged from the first channel 100 or the second channel 200 to pass through the heating core H, or pass through the bypass channel 600 without passing through the heating core H.

[0031] In the air conditioning unit for a vehicle according to the present disclosure, air flows inside through two streams. That is, air flows in a first channel 100 and a second channel 200, each of which has an inlet and an outlet. The air blowing unit 300 includes a first blower fan 320 and a second blower fan 340 respectively disposed in the first channel 100 and the second channel 200. The first blower fan 320 and the second blower fan 340 rotate together by sharing a rotating shaft and a driving unit 360. Therefore, a compact size can be achieved and the number of drive motors and motor drivers is reduced, thereby reducing the overall cost.

[0032] The cooling core C is disposed between the inlet 122 of the first channel 100 and the first blower fan 320 in the first channel 100. Therefore, the air flowing through the inside of the first channel 100 always flows in a cooling state. The heating core H is disposed at the outlet of the first channel 100 and the outlet of the second channel 200. Therefore, the air flowing through the second channel 200 is heated by the heating core H. Internal heating can be performed by discharging the air flowing through the first channel 100 to the outside and using the air that has passed through the heat core H through the second channel 200. In this process, heat is obtained by discharging the air that has passed through the cooling core C to the outside, which improves the heating performance.

[0033] In addition, internal cooling is performed by discharging the air that has passed through the heat core H through the second channel 200 to the outside and by using the air flowing through the first channel 100. In this process, the heating core H serves as a condenser. The air flowing through the first channel 100 always passes through the cooling core, so it is air with reduced absolute humidity. When the air passes through the heating core H again, the relative humidity is also reduced, so the air can be used in a dehumidification mode. For this reason, the cooling core C is provided in the first channel 100. However, the heating core H is provided at the outlet 240 of the second channel 200 so that the air can flow selectively.

[0034] In order to selectively perform temperature control and humidity control, the bypass passage 600 is provided at one side of the heating core H so as to be able to bypass the heating core H. The control door D3 is provided between the outlet 140 of the first passage 100 and the outlet 240 of the second passage 200, the heating core H, and the bypass passage 600 so that the air discharged from the first passage 100 or the second passage 200 flows into the interior after passing through the heating core H, or flows into the interior through the bypass passage 600 without passing through the heating core H.

[0035] In order to achieve such a configuration of a compact size, the air conditioning unit of the present disclosure is broadly composed of an intake housing 400 and an exhaust housing 500. The intake housing 400 is a housing that receives air. The exhaust housing 500 is a housing that discharges air to the inside or outside. The cooling core C is disposed in the first passage 100 of the intake housing 400, and the heating core H is disposed in the exhaust housing 500. The blower unit 300 and various doors are also disposed in the exhaust housing 500.

[0036] In the embodiment shown in the figure, the air intake housing 400 is coupled to one side of the exhaust housing 500 so that the air passage is bent by 90°. In addition, in this embodiment, the cooling core C is disposed in the air intake housing 400. The heating core H is disposed in the exhaust housing 500. However, the scope of the present disclosure is not limited to this shape and arrangement. Both the cooling core C and the heating core H may be disposed in the exhaust housing 500. The blower unit 300 may be disposed between the cooling core C and the heating core H so that the air passage that has passed through the cooling core C directly enters the blower unit 300 and the heating core H without bending.

[0037] The first channel 100 and the second channel 200 are formed across the interface between the intake housing 400 and the exhaust housing 500. The air in the first channel 100 and the second channel 200 flows in the separated channels until it is discharged through the blower unit after flowing into the channels. A first intake channel 120 and a second intake channel 220 are formed in the intake housing 400, each having an inlet and an outlet. The first intake channel 120 represents a portion of the first channel formed in the intake housing 400. The second intake channel 220 represents a portion of the second channel 200 formed in the intake housing 400. A blower chamber 380 divided into two spaces is formed in the exhaust housing 500. The first blower fan 320 and the second blower fan 340 are respectively arranged in the space of the blower chamber 380. The outlet 124 of the first intake channel 120 is connected to the inlet E1 of the space where the first blower fan 320 is arranged, thereby forming the first channel 100. The outlet 224 of the second intake passage 220 communicates with the inlet E2 of the space where the second blowing fan 340 is disposed, thereby forming the second passage 200 .

[0038] like Figure 2 and 4 As shown, a door is provided at each inlet 122 and 222 of the first and second intake passages 120 and 220, so that the air flowing into the first and second intake passages 120 and 220 can be selected as the interior air or the exterior air of the vehicle. The air flowing through the first intake passage 120 is allowed to flow to the cooling core C.

[0039] The air flowing in the air intake housing 400 flows into one side of the exhaust housing 500, such as Figure 4 and Figure 5As shown. The first blower fan 320 is disposed in the blower chamber 380 provided in the exhaust housing 500, close to the intake housing 400. The second blower fan 340 is disposed in the blower chamber 380, away from the intake housing 400. The outlet 124 of the first intake passage 120 may be directly connected to the first blower fan 320. The outlet 224 of the second intake passage 220 may be connected to the second blower fan 340 on the opposite side after bypassing the blower chamber 380. That is, as Figure 5 As shown, the outlet 124 of the first air intake passage 120 is connected to the first blower fan 320. The air flowing through the second air intake passage 220 flows into the exhaust housing 500 through the hole H, as shown. Figure 4 As shown, air flows around the blast chamber 380 and then flows into the second blower fan 340 from the back. The air intake housing 400 may be coupled to one side of the exhaust housing 500. The drive unit 360 for the blower unit may be coupled to the other side. With this structure, the first blower fan 320 and the second blower fan 340 may be arranged to overlap each other, the rotation axis may be shared, and the blower drive unit 360 may also be shared, thereby reducing the number of components. In addition, the size of the entire exhaust housing 500 may be significantly reduced.

[0040] At the same time, if Figure 8 and Fig. 9 As shown, the first door D1 communicating with the outside is disposed at the outlet 140 of the first passage 100. The blast chamber 380 is divided into two spaces by the blast separation wall 382. The first blast fan 320 and the second ventilating fan 340 are disposed in the spaces respectively. Figure 8 In the interior covered with the air blowing separation wall 382, ​​the first blower fan 320 blows air to the outlet 140 of the first passage 100. In this process, when the first door D1 is opened, the air that has passed through the cooling core C and the first blower fan 320 is discharged to the outside. When the first door D1 is closed, the air can be sent to the control door D3. Figure 8 The interior of the blast separation wall 382 is shown and removed. Fig. 9 By this structure, the air cooled by the cooling core C can be discharged to the outside during heating. The air can also be used by sending the air to the control door D3 during cooling or dehumidification.

[0041] In addition, if Figure 6 and Figure 7As shown, the second door D2 connected to the outside is arranged on the downstream side of the heating core H. When the second door D2 is opened, the air that has passed through the heating core H is discharged to the outside. When the second door D2 is closed, the air that has passed through the heating core H can be discharged to the interior of the vehicle. Therefore, the air that has passed through the heating core H can be discharged during cooling. The air can also be used in heating or dehumidification. According to this structure, cooling, heating, mixing and dehumidification can be performed. To this end, the first door D1 is arranged at the outlet 140 of the first channel 100. The second door D2 is arranged on the downstream side of the heating core H.

[0042] like Figure 4 As shown, the air intake housing 400 is divided into a first air intake passage 120 and a second air intake passage 220 by an air intake partition wall 420. The selection door D4 is set on the downstream side of the partition wall from the cooling core C. When the selection door D4 is opened, the first air intake passage 120 and the second air intake passage 220 are spaced apart. When the selection door D4 is closed, the air that has flowed through the cooling core C can flow into the first blower fan 320 and the second blower fan 340 through the first air intake passage 120 and the second air intake passage 220. Since the air that has flowed through the cooling core C flows into the first blower fan 320 and the second blower fan 340 through the selection door D4, sufficient air flow and cooling or dehumidification efficiency can be ensured. By completely spacing the two passages, maximum heating efficiency during heating can also be ensured.

[0043] An exhaust chamber 520 for discharging air into the vehicle and mode doors M1 and M2 installed at the exhaust chamber 520 are provided in the exhaust housing 500. A core chamber 540 having a heating core H therein is formed. An inlet 542 of the core chamber 540 and an inlet 620 of the bypass channel 600 are provided toward an outlet of the blast chamber 380. A control door D3 is provided between the inlet 542 of the core chamber, the inlet 620 of the bypass channel, and the outlet of the blast chamber, so that various modes can be realized. First, the air flowing in the exhaust chamber 520 can be discharged onto the body V1 or the windshield V2 of the passenger by controlling the first mode door M1, and the air can be discharged onto the floor V3 by controlling the second mode door M2.

[0044] The bypass channel 600 is formed in a space between the core chamber 540 and the blower chamber 380 outside the core chamber 540. The outlet 640 of the bypass channel 600 may be connected to the exhaust chamber 520. The second door D2 communicating with the outside is provided at the outlet 542 of the core chamber 540. When the second door D2 is opened, the air that has passed through the heating core H may be discharged to the outside through the hole E. When the door D2 is closed, the air that has passed through the heating core H may be discharged to the exhaust chamber 520. The first door D1 communicating with the outside is provided at the outlet 140 of the space where the first blower fan 320 is provided in the blower chamber 380. When the first door D1 is opened, the air that has passed through the first blower fan 320 may be discharged to the outside. When the first door D1 is closed, the air that has passed through the first blower fan 320 may be discharged to the control door D3.

[0045] The following describes a method for realizing various modes of an air conditioning unit for a vehicle according to the present disclosure. First, efficiency is ensured by closing the selection door D4 in the cooling mode. In addition, the air in the first channel 100 is used for cooling by closing the first opening door D1. By placing the control door D3 in the neutral position, the cold air discharged through the first channel 100 is used for interior air conditioning through the exhaust chamber 520. The cold air discharged through the second channel 200 is allowed to flow through the heating core H and then discharged to the outside by opening the second opening door D2, thereby pursuing maximum cooling efficiency.

[0046] In heating mode, cold air and normal air are separated by opening the selection door D4. Cold air in the first channel 100 is discharged to the outside by opening the first door D1. Only the air in the second channel 200 is sent to the heating core H through the control door D3. By closing the second door D2, hot air is used for internal heating. In dehumidification mode, by keeping the first door D1 closed, the air is heated for dehumidification after cooling.

[0047] According to the air conditioning unit for a vehicle, cooling / heating can be performed while switching air passages without using a heat pump system that changes refrigerant and integrating a blower motor by integrating cooling and heating systems, unlike existing air conditioning systems.

[0048] Although the present disclosure is provided above in conjunction with the specific embodiments shown in the accompanying drawings, it will be obvious to those skilled in the art that the present disclosure can be changed and modified in various ways without departing from the scope of the present disclosure, which is described in the following claims.

Claims

1. An air conditioning unit for a vehicle, comprising: a first channel having an inlet and an outlet and a second channel having an inlet and an outlet; an air blowing unit including a first air blowing fan and a second air blowing fan, the first air blowing fan and the second air blowing fan being respectively disposed in the first passage and the second passage and rotating together by sharing a rotating shaft and a driving unit; a cooling core disposed in the first passage between an inlet of the first passage and the first blower fan; A heating core, disposed at an outlet of the first channel and an outlet of the second channel; a bypass channel, arranged at one side of the heating core to bypass the heating core; a control door disposed between an outlet of the first passage, an outlet of the second passage, the heating core, and the bypass passage to control air discharged from the first passage or the second passage to pass through the heating core or to pass through the bypass passage without passing through the heating core; as well as an air intake housing and an exhaust housing, the exhaust housing being coupled to a side of the air intake housing, wherein a first air intake passage having an inlet and an outlet and a second air intake passage having an inlet and an outlet are formed in the air intake housing, wherein a blower chamber divided into two spaces is formed in the exhaust housing, wherein the first blower fan and the second blower fan are respectively arranged in the spaces of the blower chamber, wherein the outlet of the first air intake passage is communicated with the inlet of the space in which the first blower fan is arranged, thereby forming the first passage, and wherein the outlet of the second air intake passage is communicated with the inlet of the space in which the second blower fan is arranged, thereby forming the second passage, wherein the intake housing is divided into the first intake passage and the second intake passage by an intake partition wall, and wherein a selection door is provided on a downstream side of the partition wall from the cooling core, wherein, when the selection door is opened, the first air intake passage and the second air intake passage are separated, and When the selection door is closed, the air having passed through the cooling core flows into the first blower fan and the second blower fan through the first intake passage and the second intake passage.

2. The air conditioning unit according to claim 1, wherein: A first door connected to the outside is set at the outlet of the first channel, wherein when the first door is opened, the air that has passed through the cooling core is discharged to the outside, and wherein, when the first door is closed, the air that has passed through the cooling core is discharged to the control door.

3. The air conditioning unit according to claim 1, wherein: A second door connected to the outside is set at a downstream position of the heating core, wherein when the second door is opened, the air that has passed through the heating core is discharged to the outside, and wherein when the second door is closed, the air that has passed through the heating core is discharged to the interior of the vehicle.

4. The air conditioning unit according to claim 1, wherein: The cooling core and the heating core are respectively an evaporator and a condenser connected by a refrigeration line, and Wherein, a compressor and an expansion valve are included in the refrigeration pipeline.

5. The air conditioning unit of claim 1, wherein: The cooling core is arranged in the first air intake passage, the first blower fan is arranged close to the air intake housing in the blower chamber, the second blower fan is arranged away from the air intake housing in the blower chamber, the outlet of the first air intake passage is directly connected to the first blower fan, and the outlet of the second air intake passage is connected to the second blower fan on the opposite side after bypassing the blower chamber.

6. The air conditioning unit of claim 1, wherein: The intake housing is coupled to one side of the exhaust housing, and the driving unit for the blower unit is coupled to the other side of the exhaust housing.

7. The air conditioning unit of claim 1, wherein: An exhaust chamber for discharging air into the vehicle and a mode door installed at the exhaust chamber are arranged in the exhaust housing to form a core chamber having the heating core therein, the inlet of the core chamber and the inlet of the bypass channel are arranged toward the outlet of the blower chamber, and the control door is arranged between the inlet of the core chamber, the inlet of the bypass channel, and the outlet of the blower chamber.

8. The air conditioning unit according to claim 7, wherein: The bypass passage is formed outside the core chamber, and an outlet of the bypass passage is connected to the exhaust chamber.

9. The air conditioning unit of claim 7, wherein: A second door connected to the outside is arranged at the outlet of the core chamber, wherein, when the second door is opened, the air that has passed through the heating core is discharged to the outside, and wherein, when the second door is closed, the air that has passed through the heating core is discharged to the exhaust chamber.

10. The air conditioning unit of claim 1, wherein: A first door connected to the outside is set at the exit of the space where the first blower fan is located. When the first door is opened, the air that has passed through the first blower fan is discharged to the outside, and when the first door is closed, the air that has passed through the first blower fan is discharged to the control door.

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