Railway vehicle air conditioning system control method and railway vehicle

Abstract

The invention provides a rail vehicle air conditioner system control method which comprises the following steps: S1, an air conditioner control unit receives a station parking signal sent by a vehicle central control unit and enters a station parking mode; s2, after the air conditioner control unit receives the door opening instruction, the current refrigerating or heating mode is kept, the operation frequency of a condensation fan is reduced, and the operation frequency of a compressor is improved; and S3, the air conditioner control unit quits the station parking mode after receiving the door closing instruction. When the railway vehicle is parked and the door is opened, the operation frequency of the condensation fan is reduced, the noise in a passenger room is reduced, and the riding experience of passengers is improved; and on the other hand, the operation frequency of the compressor is increased during parking and door opening, the refrigerating or heating effect of the air conditioning system is guaranteed, and therefore large fluctuation of the temperature in the passenger room is avoided. The invention further provides the railway vehicle adopting the control method for the air conditioning system of the railway vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicle air conditioning system control, and more specifically, to a rail vehicle air conditioning system control method and a rail vehicle. Background Art

[0002] When a rail vehicle stops at a tunnel platform, the temperature inside the vehicle is prone to fluctuations due to the influence of heat transfer from the air outside the vehicle. The Chinese patent with application number 202011077294.X relates to a method for controlling the air volume of a rail vehicle air conditioning system and a rail vehicle, including the following steps: S1. The air conditioning control unit receives a station parking signal issued by the vehicle central control unit and enters the station parking mode; S2. After entering the station parking mode, the air conditioning control unit controls the air conditioning ventilator and the exhaust fan to reduce the pressure inside the vehicle; S3. After entering the station parking mode, the air conditioning system is controlled to maintain the current cooling or heating condition, and at the same time, the cooling or heating condition is controlled to enter the mode of reducing the cooling capacity or heating capacity; S4. The vehicle central control unit sends a door closing signal to the air conditioning control unit, exits the station parking mode, and the air conditioning control unit controls the air conditioning ventilator and the exhaust fan to return to the automatic air volume adjustment mode. Since the temperature in the passenger compartment of the rail vehicle is more susceptible to fluctuations due to the influence of heat transfer from the outside air when parking at the station, the comfort of the passengers cannot be guaranteed.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] An object of the present invention is to overcome the deficiencies of the prior art and to provide a method for controlling a rail vehicle air conditioning system, which can avoid large fluctuations in the temperature inside the passenger compartment when the rail vehicle stops at a station and opens its doors, thereby ensuring the riding experience of passengers.

[0005] A second object of the present invention is to provide a rail vehicle adopting the above rail vehicle air conditioning system control method.

[0006] To achieve the first purpose, the basic concept of the technical solution adopted by the present invention is:

[0007] A rail vehicle air conditioning system control method comprises the following steps:

[0008] S1, the air conditioning control unit receives a station parking signal sent by the vehicle central control unit and enters the station parking mode;

[0009] S2: After receiving the door opening command, the air conditioning control unit maintains the current cooling or heating mode and reduces the operating frequency of the condensing fan and increases the operating frequency of the compressor;

[0010] S3: The air conditioning control unit exits the station parking mode after receiving the door closing command.

[0011] Furthermore, in step S2, the change in the operating frequency of the compressor is greater than the change in the operating frequency of the condensing fan.

[0012] Furthermore, the change in the operating frequency of the condensing fan in the cooling mode is the same as the change in the operating frequency of the condensing fan in the heating mode, and / or the change in the operating frequency of the compressor in the cooling mode is the same as the change in the operating frequency of the compressor in the heating mode.

[0013] Furthermore, step S2 also includes the air conditioning control unit determining whether the current operating mode is a cooling mode, and if so, lowering the set temperature to a first set temperature; if not, raising the set temperature to a second set temperature.

[0014] Furthermore, a difference ΔT1 between the set temperature and the first set temperature is equal to a difference ΔT2 between the second set temperature and the set temperature.

[0015] Furthermore, the step S2 also includes reducing the opening of the electronic expansion valve.

[0016] Further, the change in the opening degree of the electronic expansion valve in the cooling mode is the same as the change in the opening degree of the electronic expansion valve in the heating mode.

[0017] Furthermore, the step S2 also includes reducing the operating frequency of the ventilator and increasing the opening of the return air valve, increasing the operating frequency of the exhaust fan or increasing the opening of the exhaust valve.

[0018] To achieve the second purpose, the basic concept of the technical solution adopted by the present invention is:

[0019] A rail vehicle comprises an air conditioning system and adopts the rail vehicle air conditioning system control method.

[0020] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] 1. In the present invention, when the rail vehicle stops and opens the door, the operating frequency of the condensing fan is reduced, the noise in the passenger compartment is reduced, and the riding experience of the passengers is improved; on the other hand, when the rail vehicle stops and opens the door, the operating frequency of the compressor is increased, and the cooling or heating effect of the air-conditioning system is guaranteed, thereby avoiding large fluctuations in the temperature in the passenger compartment.

[0022] 2. In the present invention, when the rail vehicle stops and opens the door, the opening of the electronic expansion valve decreases, so that the flow rate of the refrigerant in the circulation pipeline increases, the pressure decreases, and its boiling point also decreases accordingly, thereby ensuring that the refrigerant is in a saturated gas state after passing through the evaporator and before entering the compressor, avoiding damage to the compressor.

[0023] 3. In the present invention, when the rail vehicle stops with its door open, the operating frequency of the ventilator is reduced and the opening of the return air valve is increased, thereby reducing the fresh air load under the premise of a certain air supply volume, thereby avoiding large fluctuations in the temperature in the passenger compartment caused by the outside air; on the other hand, due to the increased operating frequency of the exhaust fan or the increased opening of the exhaust valve, the pressure in the vehicle is reduced, ensuring that the door of the rail vehicle can be closed normally.

[0024] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0026] Figure 1 It is a flow chart of an embodiment of a method for controlling a rail vehicle air conditioning system according to the present invention.

[0027] It should be noted that the drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] When a rail vehicle stops and opens its doors at a tunnel platform, the temperature inside the passenger compartment is prone to fluctuate greatly due to the heat transfer from the air outside the vehicle.

[0032] The present invention provides a rail vehicle air conditioning system control method to prevent the temperature in the passenger compartment from fluctuating greatly when the vehicle door is opened, comprising the following steps:

[0033] S1, the air conditioning control unit receives a station parking signal sent by the vehicle central control unit and enters the station parking mode;

[0034] S2: After receiving the door opening command, the air conditioning control unit maintains the current cooling or heating mode and reduces the operating frequency of the condensing fan and increases the operating frequency of the compressor;

[0035] S3: The air conditioning control unit exits the station parking mode after receiving the door closing command.

[0036] In the present invention, after the air conditioning control unit receives the door opening command, it maintains the current cooling or heating mode, that is, when the current air conditioning is in cooling mode, it still maintains the cooling mode after opening the door; when the current air conditioning is in heating mode, it still maintains the heating mode after opening the door.

[0037] Furthermore, considering that when a rail vehicle stops at a station and opens its doors, if the condensing fan operates at the original frequency, the noise in the passenger compartment will be too loud, and the passenger riding experience cannot be guaranteed. After receiving the door opening instruction, the air conditioning control unit of the present invention reduces the operating frequency of the condensing fan to reduce the noise in the passenger compartment.

[0038] The operating principle of the rail vehicle air conditioning system is that the compressor compresses the refrigerant into high-pressure gas, and this part of the high-pressure gas is condensed into liquid in the condenser, that is, the high-pressure gas is converted into high-pressure liquid and releases heat. The outside air exchanges heat with the condenser and absorbs this part of the heat to become warm air. Then the high-pressure liquid flows through the throttling device. The throttling device has a local contraction. The flow rate of the high-pressure liquid increases when it flows through the local contraction, and its pressure decreases accordingly. That is, the high-pressure liquid is converted into a low-pressure liquid after flowing out of the throttling device. Then the low-pressure liquid flows through the evaporator and absorbs heat at the evaporator, and is converted from liquid to gas, that is, the low-pressure liquid is converted into a low-pressure gas at the evaporator. The outside air exchanges heat with the evaporator. Since the low-pressure liquid in the evaporator absorbs heat when evaporating, the temperature of the outside air decreases and becomes cold wind. After flowing out of the evaporator, the low-pressure gas flows back into the compressor and is compressed into high-pressure gas for recirculation.

[0039] After the operating frequency of the condensing fan is reduced, the heat exchange effect of the condenser becomes worse, and the heat released when the refrigerant changes from gas to liquid in the condenser cannot be dissipated in time, resulting in an increase in the condensation temperature, and the corresponding refrigerant pressure also increases accordingly. Since the condenser is connected to the air outlet of the compressor, the increase in the refrigerant pressure in the condenser will eventually reduce the exhaust volume of the compressor. Therefore, in the present invention, while reducing the operating frequency of the condensing fan, the operating frequency of the compressor is also increased to increase the exhaust volume of the compressor, thereby ensuring the cooling or heating effect of the air conditioning system.

[0040] Furthermore, in step S2, the change in the operating frequency of the compressor is greater than the change in the operating frequency of the condensing fan.

[0041] Furthermore, in the present invention, the change in the operating frequency of the condensing fan in the cooling mode is the same as the change in the operating frequency of the condensing fan in the heating mode, and / or the change in the operating frequency of the compressor in the cooling mode is the same as the change in the operating frequency of the compressor in the heating mode.

[0042] In one embodiment of the present invention, step S2 also includes the air conditioning control unit determining whether the current operating mode is a cooling mode, and if so, lowering the set temperature to a first set temperature; if not, raising the set temperature to a second set temperature.

[0043] Considering that the power of the compressor decreases when the temperature in the passenger compartment reaches the set temperature, the cooling capacity or heating capacity decreases. If the door is opened at this time, the outside air will cause a large fluctuation in the temperature in the passenger compartment. The temperature regulation of the air conditioning system has a lag. The operating frequency of the compressor will be increased again to increase the cooling capacity or heating capacity output only after the passenger comfort is reduced. In this embodiment, after the air conditioning control unit receives the door opening command, if the current mode is the cooling mode, the set temperature is reduced to the first set temperature to ensure the cooling capacity output of the air conditioner and avoid the hot air from the outside causing a large fluctuation in the temperature in the passenger compartment; if the current mode is the heating mode, the air conditioning control unit will increase the set temperature to the second set temperature to ensure the heating capacity output of the air conditioner and avoid the cold air from the outside causing a large fluctuation in the temperature in the passenger compartment.

[0044] Furthermore, in this embodiment, the difference ΔT1 between the set temperature and the first set temperature is equal to the difference ΔT2 between the second set temperature and the set temperature.

[0045] In another embodiment of the present invention, step S2 also includes reducing the opening of the electronic expansion valve. When the opening of the electronic expansion valve is reduced, its throttling effect is more significant, the flow rate of the refrigerant in the circulation pipeline of the air-conditioning system increases, and the corresponding pressure decreases. As the refrigerant pressure decreases, its boiling point also decreases accordingly. This part of the refrigerant absorbs heat when flowing through the evaporator and changes from liquid to gas, and then enters the compressor and is compressed into high-pressure gas. The reduction of the opening of the electronic expansion valve can avoid the phenomenon of suction liquid when the compressor is inlet, thereby avoiding damage to the compressor.

[0046] Furthermore, in this embodiment, the change in the opening degree of the electronic expansion valve in the cooling mode is the same as the change in the opening degree of the electronic expansion valve in the heating mode.

[0047] In another embodiment of the present invention, after the air-conditioning control unit receives the door opening command in step S2, the fresh air valve maintains the current opening, the operating frequency of the ventilator is reduced, and while reducing the amount of fresh air, the noise in the passenger compartment can also be reduced. At the same time, the opening of the return air valve is increased, and the fresh air load is reduced under the premise of a certain air supply volume, further reducing the impact of outside air on the temperature in the passenger compartment.

[0048] Furthermore, under the premise of a certain air supply volume, the air conditioning control unit also increases the operating frequency of the exhaust fan or increases the opening of the exhaust valve, increasing the exhaust volume, thereby reducing the pressure inside the car, so that the positive pressure inside the car is maintained at 30-50pa. Within this pressure range, the doors of rail vehicles can be closed normally, and there will be no anti-squeezing phenomenon when the doors are closed due to the increased pressure difference outside the doors.

[0049] like Figure 1 As shown, in one embodiment of the present invention, the air conditioning control unit receives a station parking signal sent by the vehicle central control unit and enters the station parking mode.

[0050] After receiving the door opening command, the air conditioning control unit increases the opening of the return air valve and reduces the operating frequency of the ventilator to reduce the fresh air load, thereby reducing the impact of outside air on the temperature in the passenger compartment; at the same time, it increases the operating frequency of the exhaust fan or increases the opening of the exhaust air valve to reduce the positive pressure in the car, so that the positive pressure in the car is maintained at 30-50pa, thereby ensuring the normal closing of the door.

[0051] The air conditioning control unit then determines whether the current operating mode is the cooling mode. If so, the set temperature is lowered to the first set temperature, and the operating frequency of the condensing fan is reduced to reduce the noise in the passenger compartment. The output of the air conditioning cooling capacity is ensured by increasing the operating frequency of the compressor to avoid large fluctuations in the temperature in the passenger compartment caused by heat transfer from external hot air, and the normal operation of the compressor is ensured by reducing the opening of the electronic expansion valve.

[0052] If not, it means that the current operating mode is heating mode. At this time, the air-conditioning control unit will raise the set temperature to the second set temperature, and at the same time reduce the operating frequency of the condensing fan to reduce the noise in the passenger compartment, and ensure the output of air-conditioning heating capacity by increasing the operating frequency of the compressor to avoid large fluctuations in the temperature in the passenger compartment due to heat transfer from external cold air, and ensure the normal operation of the compressor by reducing the opening of the electronic expansion valve.

[0053] After receiving the door closing command, the air conditioning control unit exits the station parking mode, the return air valve, electronic expansion valve and waste exhaust valve return to normal opening, and the ventilator, waste exhaust fan, condensing fan and compressor return to normal operating frequency.

[0054] The present invention also provides a rail vehicle, comprising an air conditioning system, wherein the air conditioning system adopts the above-mentioned rail vehicle air conditioning system control method.

[0055] The working process of the air conditioning system of a rail vehicle when it stops at a station is as follows:

[0056] The air conditioning control unit receives the station parking signal sent by the vehicle central control unit and enters the station parking mode.

[0057] In the station parking mode, after receiving the door opening command, the air conditioning control unit increases the opening of the return air valve and reduces the operating frequency of the ventilator, thereby reducing the fresh air load of the supply air while ensuring a certain air supply volume, thereby reducing the impact of outside air on the temperature in the passenger compartment; at the same time, the operating frequency of the exhaust fan is increased or the opening of the exhaust valve is increased to reduce the positive pressure in the car, so that the positive pressure in the car is maintained at 30-50pa, thereby ensuring the normal closing of the door.

[0058] The air conditioning control unit then determines whether the current operating mode is the cooling mode. If so, the set temperature is lowered to the first set temperature, and the operating frequency of the condensing fan is reduced to reduce the noise in the passenger compartment. The output of the air conditioning cooling capacity is ensured by increasing the operating frequency of the compressor to avoid large fluctuations in the temperature in the passenger compartment caused by heat transfer from external hot air, and the normal operation of the compressor is ensured by reducing the opening of the electronic expansion valve.

[0059] If not, it means that the current operating mode is heating mode. At this time, the air-conditioning control unit will raise the set temperature to the second set temperature, and at the same time reduce the operating frequency of the condensing fan to reduce the noise in the passenger compartment, and ensure the output of air-conditioning heating capacity by increasing the operating frequency of the compressor to avoid large fluctuations in the temperature in the passenger compartment due to heat transfer from external cold air, and ensure the normal operation of the compressor by reducing the opening of the electronic expansion valve.

[0060] After receiving the door closing command, the air conditioning control unit exits the station parking mode, the return air valve, electronic expansion valve and waste exhaust valve return to normal opening, and the ventilator, waste exhaust fan, condensing fan and compressor return to normal operating frequency.

[0061] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above in the preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A rail vehicle air conditioning system control method, characterized in that: The steps include: S1, the air conditioning control unit receives a station parking signal sent by the vehicle central control unit and enters the station parking mode; S2: After receiving the door opening command, the air conditioning control unit maintains the current cooling or heating mode and reduces the operating frequency of the condensing fan and increases the operating frequency of the compressor; S3: The air conditioning control unit exits the station parking mode after receiving the door closing command.

2. A rail vehicle air conditioning system control method according to claim 1, characterized in that: In step S2, the change in the operating frequency of the compressor is greater than the change in the operating frequency of the condensing fan.

3. A rail vehicle air conditioning system control method according to claim 2, characterized in that: The change in the operating frequency of the condensing fan in the cooling mode is the same as the change in the operating frequency of the condensing fan in the heating mode, and / or the change in the operating frequency of the compressor in the cooling mode is the same as the change in the operating frequency of the compressor in the heating mode.

4. A rail vehicle air conditioning system control method according to claim 1, characterized in that: The step S2 also includes the air conditioning control unit determining whether the current operating mode is the cooling mode, and if so, lowering the set temperature to the first set temperature; if not, raising the set temperature to the second set temperature.

5. A rail vehicle air conditioning system control method according to claim 4, characterized in that: The difference ΔT1 between the set temperature and the first set temperature is equal to the difference ΔT2 between the second set temperature and the set temperature.

6. A rail vehicle air conditioning system control method according to claim 1, characterized in that: The step S2 also includes reducing the opening of the electronic expansion valve.

7. A rail vehicle air conditioning system control method according to claim 6, characterized in that: The change in the opening degree of the electronic expansion valve in the cooling mode is the same as the change in the opening degree of the electronic expansion valve in the heating mode.

8. A rail vehicle air conditioning system control method according to any one of claims 1 to 7, characterized in that: The step S2 also includes reducing the operating frequency of the ventilator and increasing the opening of the return air valve, increasing the operating frequency of the exhaust fan or increasing the opening of the exhaust valve.

9. A rail vehicle, comprising an air conditioning system, characterized in that: A rail vehicle air conditioning system control method according to any one of claims 1 to 8 is adopted.

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