A control method for an air conditioner of a railway vehicle

Abstract

The application discloses a kind of control methods of rail vehicle air conditioner, belong to rail vehicle air conditioning system technical field, comprising the following steps: A, air conditioner controller compares the target temperature value Tic sent by vehicle with the temperature value Ti collected in vehicle, if Ti>Tic, then carry out refrigeration and execute step B, otherwise keep ventilation state;B, compressor cumulative working time judgment: if the cumulative working time of variable frequency compressor is less than fixed frequency compressor, execute step B.1, otherwise execute step B.2.The application judges the working time of fixed frequency compressor and variable frequency compressor, so that air conditioning unit works in two different modes, and realizes the balance of the working time of two compressors under the premise of ensuring the comfort of carriage.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of rail vehicle air conditioning system, and particularly relates to a control method of a rail vehicle air conditioner. BACKGROUND

[0002] At present, common air conditioning systems for rail vehicles include fixed-frequency single-cooling air conditioners, fixed-frequency plus electric heating air conditioners, single-cooling variable-frequency air conditioners, and variable-frequency heat pump air conditioners. Fixed-frequency air conditioners have poor comfort and high energy consumption, while variable-frequency air conditioners have good comfort and low energy consumption. However, compared with fixed-frequency air conditioners, variable-frequency air conditioners require the addition of variable-frequency control components, and the design of the variable-frequency electric control system is complex, the cost is increased, and the maintenance is poor due to the high harmonic requirement of railway vehicles.

[0003] For a double-system air conditioning unit, the use of a combination of one variable-frequency compressor and one fixed-frequency compressor can ensure comfort and reduce costs, or will become the development direction of rail vehicles. However, when the fixed-frequency compressor and the variable-frequency compressor are used at the same time, the balance of the service life of the components needs to be considered when ensuring the comfort temperature control. With the demand for intelligent operation and maintenance, the replacement of the compressor is changed from regular (10-15 years of overhaul) to statistical life, and the compressor needs to be replaced before reaching approximately 50,000 hours of life. The service life of the two compressors is not uniform, and different maintenance times will increase the maintenance cost. SUMMARY

[0004] The problem to be solved by the present application is to provide a control method of a rail vehicle air conditioner, which realizes uniform service life of two compressors by balanced control of a fixed-frequency compressor and a variable-frequency compressor.

[0005] To solve the above technical problems, the technical solution adopted by the present application is: a control method of a rail vehicle air conditioner, based on an air conditioning unit having one fixed-frequency compressor and one variable-frequency compressor, a bypass electromagnetic valve is provided on the refrigerant pipeline matched with the fixed-frequency compressor, the air conditioning unit has five refrigeration levels, and the key is that the method comprises the following steps: A, the air conditioner controller compares the target temperature value Tic sent by the vehicle with the indoor temperature value Ti collected, and if Ti>Tic, refrigeration is performed and step B is executed, otherwise the ventilation state is maintained;

[0006] B, compressor cumulative working time judgment: if the cumulative working time of the variable-frequency compressor is less than that of the fixed-frequency compressor, step B.1 is executed, otherwise step B.2 is executed;

[0007] B.1, when the refrigeration level is 1, the fixed frequency compressor stops, the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is 2, the fixed frequency compressor stops, the variable frequency compressor runs at a frequency of 50 Hz, when the refrigeration level is 3, the fixed frequency compressor starts and the bypass solenoid is powered, the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is 4, the fixed frequency compressor starts and the bypass solenoid is de-energized, the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is 5, the fixed frequency compressor starts and the bypass solenoid is de-energized, the variable frequency compressor runs at a frequency of 50 Hz;

[0008] B.2, when the refrigeration level is 1, the fixed frequency compressor starts and the bypass solenoid is powered, the variable frequency compressor stops, when the refrigeration level is 2, the fixed frequency compressor starts and the bypass solenoid is de-energized, the variable frequency compressor stops, when the refrigeration level is 3, the fixed frequency compressor starts and the bypass solenoid is powered, the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is 4, the fixed frequency compressor starts and the bypass solenoid is de-energized, the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is 5, the fixed frequency compressor starts and the bypass solenoid is de-energized, the variable frequency compressor runs at a frequency of 50 Hz.

[0009] Further, in step B, when the cumulative working time of the variable frequency compressor is less than that of the fixed frequency compressor by T1, step B.1 is performed, otherwise step B.2 is performed, T1 = 16 x n, n is in the range of 5-8.

[0010] Further, in step B.1 or B.2, if Ti > Tic+2, directly run at a refrigeration level of 5, otherwise run at a refrigeration level of 1 and run at the corresponding refrigeration level according to the value of Ti.

[0011] Furthermore, in step B.1 or B.2, the switching of each cooling level includes the following steps: After entering cooling level 1, delay for s1 seconds; if Ti > Tic + 0.5, enter cooling level 2; if Ti < Tic - 1, stop cooling and enter ventilation mode; otherwise, maintain the current cooling level. After entering cooling level 2 from cooling level 1, delay for s2 seconds; if Ti > Tic + 0.5, enter cooling level 3; if Ti < Tic - 0.5, enter cooling level 1; otherwise, maintain the current cooling level. After upgrading from cooling level 2 to cooling level 3, delay for s3 seconds; if Ti > Tic + 0.5, enter cooling level 3. If Ti + Tic + 0.5, it enters level 4 cooling; if Ti < Tic - 0.5, it enters level 2 cooling; otherwise, it maintains the current cooling level. After upgrading from level 3 to level 4, there is a delay of s4 seconds. If Ti > Tic + 0.5, it enters level 5 cooling; if Ti < Tic - 0.5, it enters level 3 cooling; otherwise, it maintains the current cooling level. After upgrading from level 4 to level 5, there is a delay of s5 seconds. If Ti < Tic - 0.5, it enters level 4 cooling; otherwise, it maintains the current cooling level. Where s1 = 30, s2 = 60, s3 = 120, s4 = 60, s5 = 60.

[0012] Furthermore, after the air conditioning unit is powered on and started, the ventilation fan starts first and executes step A one minute after starting.

[0013] The beneficial effect of this invention is that by judging the working time of the fixed-frequency compressor and the variable-frequency compressor, the air conditioning unit can work in two different modes, thereby achieving a balance in the working time of the two compressors while ensuring the comfort of the passenger compartment.

[0014] The present invention will now be described in detail with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the air conditioning unit in this invention.

[0016] Figure 2 This is a flowchart of the present invention. Detailed Implementation

[0017] See appendix Figure 1 This invention provides an air conditioning unit, which includes an air conditioning control panel, a fixed-frequency system and a variable-frequency system, as well as matching evaporator fans and condenser fans. Since it is a dual-system air conditioning unit, it is equipped with two evaporator fans and two condenser fans. Each of the two systems forms an independent refrigerant circulation loop.

[0018] The fixed frequency system comprises a fixed frequency compressor, a bypass electromagnetic valve, a high pressure switch, a low pressure switch, a high pressure sensor, a low pressure sensor and a matched pipeline. When the bypass electromagnetic valve loses power, the valve is in a closed state, at this time the fixed frequency compressor system is put into 100% refrigerating capacity, and the fixed frequency system is in full load working condition; when the bypass electromagnetic valve is powered on, the valve is in an open state, the fixed frequency compressor system is bypassed by 65%, the current fixed frequency compressor system is put into 35% refrigerating capacity, and the fixed frequency system is in a bypass working condition.

[0019] The variable frequency system comprises a variable frequency compressor, a variable frequency control device, a high pressure switch, a low pressure switch, a high pressure sensor, a low pressure sensor and a matched pipeline. When the variable frequency compressor works at 35 HZ, the variable frequency compressor system is put into 35% refrigerating capacity; when the variable frequency compressor works at 50 HZ, the variable frequency compressor system is put into 100% refrigerating capacity.

[0020] Under the cooperation of the two systems, the air conditioning system of the application has five refrigeration levels. When the refrigeration level is 1, the refrigerating capacity is 35%; when the refrigeration level is 2, the refrigerating capacity is 50%; when the refrigeration level is 3, the refrigerating capacity is 70%; when the refrigeration level is 4, the refrigerating capacity is 85%; and when the refrigeration level is 5, the refrigerating capacity is 100%.

[0021] The air conditioning control panel is located at the inner end of the vehicle, and integrates a controller and other driving control components. The controller receives signals of a vehicle network TCMS, collects indoor temperature, and controls the air conditioning to work. The vehicle is internally provided with a temperature sensor for detecting indoor temperature.

[0022] Referring to the accompanying drawings Figure 2 Based on the above air conditioning unit, the application provides a control method of a rail vehicle air conditioner, comprising the following steps.

[0023] A. After the air conditioning unit is powered on and started, the ventilator is first started, and after 1 minute of starting, the air conditioning controller compares the target temperature value Tic sent by the vehicle with the collected indoor temperature value Ti. If Ti > Tic, refrigeration is performed and step B is executed, otherwise the ventilation state is maintained.

[0024] B. Compressor cumulative working time judgment: if the cumulative working time of the variable frequency compressor is less than that of the fixed frequency compressor, step B.1 is executed, otherwise step B.2 is executed. Specifically, in step B, when the cumulative working time of the variable frequency compressor is less than that of the fixed frequency compressor by T1, step B.1 is executed, otherwise step B.2 is executed, T1 = 16 x n, and the value range of n is 5-8. 16 is the working time of the air conditioning unit per day, unit: hour. In this embodiment, n is 7.

[0025] B.1, when the refrigeration level is level 1, the fixed frequency compressor is stopped, and the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is level 2, the fixed frequency compressor is stopped, and the variable frequency compressor runs at a frequency of 50 Hz, when the refrigeration level is level 3, the fixed frequency compressor is started and the bypass solenoid is powered, and the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is level 4, the fixed frequency compressor is started and the bypass solenoid is de-energized, and the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is level 5, the fixed frequency compressor is started and the bypass solenoid is de-energized, and the variable frequency compressor runs at a frequency of 50 Hz.

[0026] B.2, when the refrigeration level is level 1, the fixed frequency compressor is started and the bypass solenoid is powered, and the variable frequency compressor is stopped, when the refrigeration level is level 2, the fixed frequency compressor is started and the bypass solenoid is de-energized, and the variable frequency compressor is stopped, when the refrigeration level is level 3, the fixed frequency compressor is started and the bypass solenoid is powered, and the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is level 4, the fixed frequency compressor is started and the bypass solenoid is de-energized, and the variable frequency compressor runs at a frequency of 35 Hz, when the refrigeration level is level 5, the fixed frequency compressor is started and the bypass solenoid is de-energized, and the variable frequency compressor runs at a frequency of 50 Hz.

[0027] In step B.1 or B.2, if Ti > Tic+2, directly run at level 5 refrigeration level, otherwise run at level 1 refrigeration level and run the corresponding refrigeration level according to the value of Ti.

[0028] In step B.1 or B.2, the switching of each refrigeration level includes the following steps:

[0029] After entering level 1 refrigeration level, delay for s1 seconds, if Ti > Tic+0.5, enter level 2 refrigeration level, if Ti < Tic-1, stop refrigeration and enter ventilation mode, otherwise keep the current refrigeration level; when the refrigeration level enters level 2 refrigeration level from level 1 refrigeration level, delay for s2 seconds, if Ti > Tic+0.5, enter level 3 refrigeration level, if Ti < Tic-0.5, enter level 1 refrigeration level, otherwise keep the current refrigeration level; when the level 2 refrigeration level upgrades to level 3 refrigeration level, delay for s3 seconds, if Ti > Tic+0.5, enter level 4 refrigeration level, if Ti < Tic-0.5, enter level 2 refrigeration level, otherwise keep the current refrigeration level; when the level 3 refrigeration level upgrades to level 4 refrigeration level, delay for s4 seconds, if Ti > Tic+0.5, enter level 5 refrigeration level, if Ti < Tic-0.5, enter level 3 refrigeration level, otherwise keep the current refrigeration level; when the level 4 refrigeration level upgrades to level 5 refrigeration level, delay for s5 seconds, if Ti < Tic-0.5, enter level 4 refrigeration level, otherwise keep the current refrigeration level;

[0030] Wherein, s1=30, s2=60, s3=120, s4=60, s5=60.

[0031] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, but not limit the same. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones without departing from the spirit of the technical solutions of the present application, and all of them should be covered in the technical solution range of the present application.

Claims

1. A control method for an air conditioner of a railway vehicle, based on an air conditioning unit having a fixed frequency compressor and a variable frequency compressor, a bypass solenoid valve is provided on the refrigerant pipeline matched with the fixed frequency compressor, and the air conditioning unit has five refrigeration levels, characterized in that, The method comprises the following steps: A. The air conditioner controller compares the target temperature value Tic sent by the vehicle with the collected temperature value Ti in the vehicle. If Ti > Tic, the air conditioner performs refrigeration and executes step B. Otherwise, the air conditioner keeps ventilation. B. Compressor cumulative working time judgment: If the cumulative working time of the variable frequency compressor is less than that of the fixed frequency compressor, execute step B.

1. Otherwise, execute step B.

2. B.1、 When the refrigeration level is level 1, the fixed frequency compressor stops, and the variable frequency compressor operates at a frequency of 35 Hz. When the refrigeration level is level 2, the fixed frequency compressor stops, and the variable frequency compressor operates at a frequency of 50 Hz. When the refrigeration level is level 3, the fixed frequency compressor starts, and the bypass electromagnetic valve is powered on. The variable frequency compressor operates at a frequency of 35 Hz. When the refrigeration level is level 4, the fixed frequency compressor starts, and the bypass electromagnetic valve is powered off. The variable frequency compressor operates at a frequency of 35 Hz. When the refrigeration level is level 5, the fixed frequency compressor starts, and the bypass electromagnetic valve is powered off. The variable frequency compressor operates at a frequency of 50 Hz. B.2、 When the refrigeration level is level 1, the fixed frequency compressor starts, and the bypass electromagnetic valve is powered on. The variable frequency compressor stops. When the refrigeration level is level 2, the fixed frequency compressor starts, and the bypass electromagnetic valve is powered off. The variable frequency compressor stops. When the refrigeration level is level 3, the fixed frequency compressor starts, and the bypass electromagnetic valve is powered on. The variable frequency compressor operates at a frequency of 35 Hz. When the refrigeration level is level 4, the fixed frequency compressor starts, and the bypass electromagnetic valve is powered off. The variable frequency compressor operates at a frequency of 35 Hz. When the refrigeration level is level 5, the fixed frequency compressor starts, and the bypass electromagnetic valve is powered off. The variable frequency compressor operates at a frequency of 50 Hz.

2. The control method of the air conditioner for a railway vehicle according to claim 1, characterized by In step B, when the cumulative working time of the variable frequency compressor is less than that of the fixed frequency compressor by T1, execute step B.

1. Otherwise, execute step B.

2. T1 = 16 x n, and n is in the range of 5-8.

3. The control method of the air conditioner for a railway vehicle according to claim 1, characterized by In step B.1 or B.2, if Ti > Tic + 2, directly operate at the refrigeration level 5. Otherwise, operate at the refrigeration level 1, and operate at the corresponding refrigeration level according to the value of Ti.

4. The control method of the air conditioner for a railway vehicle according to claim 1, characterized by In step B.1 or B.2, the switching of each refrigeration level comprises the following steps: After entering the refrigeration level 1, delay for s1 seconds. If Ti > Tic + 0.5, enter the refrigeration level 2. If Ti < Tic - 1, stop refrigeration and enter the ventilation mode. Otherwise, keep the current refrigeration level. After entering the refrigeration level 2 from the refrigeration level 1, delay for s2 seconds. If Ti > Tic + 0.5, enter the refrigeration level 3. If Ti < Tic - 0.5, enter the refrigeration level 1. Otherwise, keep the current refrigeration level. After upgrading the refrigeration level 2 to the refrigeration level 3, delay for s3 seconds. If Ti > Tic + 0.5, enter the refrigeration level 4. If Ti < Tic - 0.5, enter the refrigeration level 2. Otherwise, keep the current refrigeration level. After upgrading the refrigeration level 3 to the refrigeration level 4, delay for s4 seconds. If Ti > Tic + 0.5, enter the refrigeration level 5. If Ti < Tic - 0.5, enter the refrigeration level 3. Otherwise, keep the current refrigeration level. When the 4th refrigeration level is upgraded to the 5th refrigeration level, delay s5 seconds, if Ti < Tic-0.5, enter the 4th refrigeration level, otherwise keep the current refrigeration level; Wherein, s1=30, s2=60, s3=120, s4=60, s5=60.

5. The control method of the air conditioner for a railway vehicle according to any one of claims 1 to 4, characterized in that, After the air conditioning unit is powered on, the ventilator is started first and step A is executed after 1 minute of starting.

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