Temperature simulation output unit and detection device for rail traffic vehicle air conditioner

Abstract

The utility model relates to a temperature simulation output unit and a detection device for an air conditioner of a rail transit vehicle, the unit comprises three high-precision resistors with different resistance values and a plurality of pairs of dial switches, and each pair of dial switches comprises a first dial switch and a second dial switch which are connected in series; a first pin of the first dial switch is connected with one end of the first high-precision resistor R1, a third pin of the first dial switch is connected with the second high-precision resistor R2, and a middle pin of the first dial switch is connected with a middle pin of the second dial switch; a first pin of the second dial switch is suspended, a third pin of the second dial switch is connected with a third high-precision resistor R3, and a middle pin of the second dial switch is a three-way temperature output point and is connected with the analog signal control circuit; and the other ends of the three high-precision resistors are grounded together. Compared with the prior art, the device has the advantages of simple structure, low cost, capability of quickly and accurately detecting the temperature of the air conditioner by utilizing the simulated fixed temperature, and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit, in particular to a temperature simulation output unit and a detection device for an air conditioner of a rail transit vehicle. Background Art

[0002] The temperature sampling control of the air conditioning ventilation system of urban rail transit vehicles uses a 681H672 control board. The 681H672 control board includes an analog signal control circuit 6, whose main function is to collect data such as vehicle temperature, humidity, dust concentration, and air flow velocity through a temperature sampling sensor 7, then process the collected data, and then forward it to the air conditioner main control circuit 1, and remotely control the temperature through the train information management system (MPU) 5.

[0003] The structure and process of the 681H672 control board are as Figure 2 shown. The power supply circuit 2 provides working power for the air conditioner main control circuit 1; the air conditioner main control circuit 1 realizes the temperature control adjustment of the air conditioner by controlling the digital signal circuit 3 and the analog signal control circuit 6.

[0004] The input end of the analog signal control circuit 6 is connected to the sampling connection input points IN1, IN2, and IN3 of the incoming air temperature, return air temperature, and ambient temperature. Due to the inconsistent temperature drift coefficients of the components of each control board, during the maintenance process, it is found that the analog signal control circuit 6 of the 681H672 control board has a temperature difference fault of more than 2°C, resulting in the inability to accurately control the air conditioner temperature of the entire carriage to a suitable temperature, thus losing the main function of the air conditioner temperature control. Therefore, it is necessary to detect the accurate temperature finally controlled by the 681H672 control board.

[0005] The on-vehicle temperature sampling sensor 7 changes with the actual temperature and cannot be controlled at a fixed temperature value. Therefore, it is necessary to detect the actual temperature difference of each 681H672 control board card, but there is no matching detection tool on the current market.

[0006] Considering the limitations of factors such as environment, time, and cost during the on-vehicle test of urban rail transit, there is an urgent need for a simple and convenient vehicle air conditioner temperature analog signal detection tool.

[0007] How to realize the convenient analog detection of the vehicle air conditioner temperature has become a technical problem to be solved. Summary of the Utility Model

[0008] The purpose of the utility model is to overcome the defects of the above-mentioned existing technologies and provide a temperature simulation output unit and a detection device for an air conditioner of a rail transit vehicle.

[0009] The purpose of the utility model can be achieved by the following technical solutions:

[0010] According to one aspect of the present utility model, there is provided a temperature simulation output unit for an air conditioner of a rail transit vehicle. The unit includes three high-precision resistors with different resistance values and multiple pairs of DIP switches. Each pair of DIP switches includes a first DIP switch and a second DIP switch connected in series;

[0011] The first pin of the first DIP switch is connected to one end of the first high-precision resistor R1, the third pin of the first DIP switch is connected to the second high-precision resistor R2, and the middle pin of the first DIP switch is connected to the middle pin of the second DIP switch;

[0012] The first pin of the second DIP switch is left floating, and the third pin of the second DIP switch is connected to the third high-precision resistor R3,

[0013] The middle pin of the second DIP switch is the three-way temperature output point and is connected to the analog signal control circuit (6);

[0014] The other ends of the three high-precision resistors are commonly grounded.

[0015] Preferably, between the first pin and the second pin of each DIP switch is the a end, and between the second pin and the third pin is the b end.

[0016] More preferably, when multiple second DIP switches and multiple first DIP switches are both switched to the a end, the three-way temperature output points share the resistance value of the fixed first high-precision resistor R1.

[0017] More preferably, when multiple second DIP switches are both switched to the a end and multiple first DIP switches are switched to the b end, the three-way temperature output points share the resistance value of the fixed second high-precision resistor R2.

[0018] More preferably, when multiple second DIP switches and multiple first DIP switches are both switched to the b end, at this time, the second high-precision resistor R2 and the third high-precision resistor R3 are in parallel, and the three-way temperature output points share a fixed resistance value of: (R2 * R3) / (R2 + R3).

[0019] More preferably, when the second DIP switches are both switched to the b end and the first DIP switches are both switched to the a end, at this time, the first high-precision resistor R1 and the third high-precision resistor R3 are in parallel, and the three-way temperature output points share a fixed resistance value of: (R1 * R3) / (R1 + R3).

[0020] Preferably, the resistance value of the first high-precision resistor R1 is 1 KΩ.

[0021] Preferably, the resistance value of the second high-precision resistor R2 is 5 KΩ.

[0022] Preferably, the resistance value of the third high-precision resistor R3 is 10 KΩ.

[0023] According to one aspect of the present utility model, there is provided a temperature simulation detection device for an air conditioner of a rail transit vehicle. The device includes an analog signal control circuit and an air conditioner control main control circuit connected to the analog signal control circuit. The device further includes a temperature analog output unit, and the temperature analog output unit is connected to the analog signal control circuit.

[0024] Compared with the prior art, the present utility model has the following beneficial effects:

[0025] 1) Through the cooperation of a DIP switch and a high-precision resistor, the present utility model simulates a variety of fixed temperatures and then inputs them into the analog signal control circuit. The air conditioner main control circuit compares the signal processed by the analog signal control circuit with the fixed temperature output by the device, so as to clearly know whether the temperature drifts and which temperature channel drifts specifically. Thus, it solves the problem of quickly and accurately detecting the temperature of the vehicle air conditioner under the limitations of factors such as environment, time, and cost during the test of rail transit vehicles, and precisely locates specific problems.

[0026] 2) The temperature simulation detection device of the present utility model is small in size and light in weight. According to the existing temperature measurement requirements of the 681H672 control board, it can be conveniently connected to the external interface of the 681H672 control board, keeping the original shape of the 681H672 control board unchanged, and can synchronize the software and take into account the environment, time, and cost, which is convenient for users to use and detect.

[0027] 3) The temperature simulation detection device of the present utility model is inexpensive. High-precision resistors and DIP switches are mature electronic components that have been widely used in power electronic circuits. They are convenient to purchase in the market, achieving the purpose of precise temperature measurement and control of temperature drift with simple components. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a circuit schematic diagram of the temperature analog output unit in the present utility model;

[0029] Figure 2 It is a structural and process schematic diagram of the 681H672 control board;

[0030] In the drawings, 1: air conditioner main control circuit, 2: power supply, 3: digital signal output, 4: data signal input, 5: train information management system, 6: analog signal control circuit, 7: temperature sampling sensor, 8: temperature simulation detection device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Based on Figure 2 , the temperature simulation output unit of the present invention replaces the temperature sampling sensor 7 in the existing detection system. This unit simulates and outputs three fixed temperatures (such as Figure 1 of IN1, IN2, and IN3), and sends them to the analog signal control circuit 6.

[0033] This embodiment relates to a temperature simulation output unit for an air conditioner of a rail transit vehicle, such as Figure 1 , which includes a first high-precision resistor R1, a second high-precision resistor R2, a third high-precision resistor R3, and multiple pairs of DIP switches. Each pair of DIP switches includes a first DIP switch and a second DIP switch.

[0034] The accuracy of the high-precision resistor is 0.01% temperature drift of 15 PPM.

[0035] Each DIP switch has 3 pins, which are pin 1, pin 2, and pin 3 in sequence. Between pin 1 and pin 2 is the a terminal, and between pin 2 and pin 3 is the b terminal.

[0036] Such as Figure 1 , the first DIP switches are DIP switches SW1, SW3, and SW5. The second DIP switches are SW2, SW4, and SW6, where SW1 and SW2 are in series, SW3 and SW4 are in series, and SW5 and SW6 are in series.

[0037] The middle pins of the DIP switches SW2, SW4, and SW6 are respectively temperature output points, denoted as IN1, IN2, and IN3, which are connected to the analog signal control circuit 6, and the three output temperatures correspond to the incoming air temperature, the return air temperature, and the ambient temperature respectively.

[0038] One end of the first high-precision resistor is connected to the common ground, and the other end is respectively connected to the pin 1 of the first DIP switches SW1, SW3, and SW5;

[0039] One end of the second high-precision resistor R2 is connected to the common ground, and the other end is respectively connected to the pin 3 of the first DIP switches SW1, SW3, and SW5;

[0040] One end of the third high-precision resistor R3 is connected to the common ground, and the other end is respectively connected to the pin 3 of the second DIP switches SW2, SW4, and SW6.

[0041] Such asFigure 1 Through different dialing states of the DIP switches SW1 to SW6, four circuits with different resistance values are formed by high-precision resistors R1 to R3 in different series-parallel modes, corresponding to the output of four fixed-temperature analog signals, specifically:

[0042] SW2, SW4, and SW6 are all set to the a terminal. From the temperature output points IN1, IN2, IN3) to the a terminals of (SW1, SW3, SW5), the three temperature output points share the fixed resistance value of the first high-precision resistor R1 (1KΩ), corresponding to the first temperature (-13.3°C).

[0043] SW2, SW4, and SW6 are all set to the a terminal. SW1, SW3, and SW5 are all set to the b terminal. The three temperature output points share the fixed resistance value of the second high-precision resistor R2 (5KΩ), corresponding to the second temperature (-25.3°C).

[0044] SW2, SW4, and SW6 are all set to the b terminal. SW1, SW3, and SW5 are all set to the b terminal. At this time, R2 (5KΩ) and R3 (10KΩ) are in parallel. The three temperature output points share a fixed resistance value of 3.33KΩ, corresponding to the third temperature (+20.76°C).

[0045] SW2, SW4, and SW6 are all set to the b terminal. SW1, SW3, and SW5 are all set to the a terminal. At this time, R1 (1KΩ) and R3 (10KΩ) are in parallel. The three temperature output points share a fixed resistance value of 909.09Ω, corresponding to the fourth temperature (+22.67°C).

[0046] When the 681H672 control board is working, it is necessary to read the signals of the inlet air temperature, return air temperature, and ambient temperature output points IN1, IN2, IN3. With the setting of the dial switch, four fixed electrical signals (generated by different resistance values) are generated, and correspondingly, four fixed electrical signals are output, forming four fixed temperatures, namely the first temperature (-13.3°C), the second temperature (-25.3°C), the third temperature (+20.76°C), and the fourth temperature (+22.67°C).

[0047] The number of DIP switches in this embodiment can be changed according to actual needs, and the number and values of the high-precision resistors can also be adapted according to actual needs. It is not limited to the rail transit scenario and is also applicable to applications in other scenarios.

[0048] This embodiment also relates to a temperature simulation detection device for a rail transit vehicle air conditioner, such as Figure 2 The device includes an analog signal control circuit 6, an air conditioner control main control circuit 1, and a temperature analog output unit.

[0049] One end of the analog signal control circuit 6 is connected to the main control circuit 1 of the air conditioner control, and the other end is connected to the temperature analog output unit. The temperature analog output unit sends three generated fixed temperature signals to the analog signal control circuit 6, and the main control circuit 1 of the air conditioner displays the signals processed by the analog signal control circuit 6. By comparing the displayed temperature with the temperature set by the device, it can be clearly known whether the temperature drifts. If the three displayed temperatures are the same as the three temperatures generated by the device or the difference is within the threshold range (set to 1°C in this embodiment), it indicates that the analog signal control circuit 6 is working properly and no temperature difference fault caused by temperature drift occurs. If the difference between at least one displayed temperature and the temperature generated by the device exceeds the threshold range, it is known that the corresponding circuit of the analog signal control circuit 6 is abnormal.

[0050] By outputting fixed temperature signals through this unit to replace the temperature signals that change with the actual temperature of the previous temperature sampling sensor 7, the temperature drift condition of the analog signal control circuit 6 at each fixed temperature can be accurately tested, thus realizing the precise detection of temperature by the analog signal control circuit 6.

[0051] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A temperature simulation output unit for an air conditioner of a rail transit vehicle, characterized in that, This unit includes three high-precision resistors with different resistance values and multiple pairs of DIP switches. Each pair of DIP switches includes a first DIP switch and a second DIP switch connected in series; The first pin of the first DIP switch is connected to one end of the first high-precision resistor R1, the third pin of the first DIP switch is connected to the second high-precision resistor R2, and the middle pin of the first DIP switch is connected to the middle pin of the second DIP switch; The first pin of the second DIP switch is left floating, and the third pin of the second DIP switch is connected to the third high-precision resistor R3. The middle pin of the second DIP switch is the three-way temperature output point and is connected to the analog signal control circuit (6); The other ends of the three high-precision resistors are commonly grounded.

2. The temperature simulation output unit for the rail transit vehicle air conditioner according to claim 1, characterized in that Between the first pin and the second pin of each DIP switch is the a end, and between the second pin and the third pin is the b end.

3. The temperature simulation output unit for the rail transit vehicle air conditioner according to claim 2, wherein When multiple second DIP switches and multiple first DIP switches are both switched to the a end, the three-way temperature output point shares the resistance value of the fixed first high-precision resistor R1.

4. The temperature simulation output unit for the rail transit vehicle air conditioner according to claim 2, wherein When multiple second DIP switches are both switched to the a end and multiple first DIP switches are switched to the b end, the three-way temperature output point shares the resistance value of the fixed second high-precision resistor R2.

5. The temperature simulation output unit for the rail transit vehicle air conditioner according to claim 2, characterized in that, When multiple second DIP switches and multiple first DIP switches are both switched to the b end, at this time, the second high-precision resistor R2 and the third high-precision resistor R3 are in parallel, and the three-way temperature output point shares a fixed resistance value of: (R2 * R3) / (R2 + R3).

6. The temperature simulation output unit for the rail transit vehicle air conditioner according to claim 2, characterized in that When the second DIP switches are both switched to the b end and the first DIP switches are both switched to the a end, at this time, the first high-precision resistor R1 and the third high-precision resistor R3 are in parallel, and the three-way temperature output point shares a fixed resistance value of: (R1 * R3) / (R1 + R3).

7. The temperature simulation output unit for the rail transit vehicle air conditioner according to claim 1, characterized in that The resistance value of the first high-precision resistor R1 is 1 KΩ.

8. The temperature simulation output unit for the rail transit vehicle air conditioner according to claim 1, wherein The resistance value of the second high-precision resistor R2 is 5 KΩ.

9. The temperature simulation output unit for the rail transit vehicle air conditioner according to claim 1, wherein The resistance value of the third high-precision resistor R3 is 10 KΩ.

10. A temperature simulation detection device for an air conditioner of a rail transit vehicle, the device comprising an analog signal control circuit (6) and an air conditioner control main control circuit (1) connected to the analog signal control circuit (6), characterized in that, This device further includes the temperature analog output unit described in any one of claims 1 to 9, and the temperature analog output unit is connected to the analog signal control circuit (6).

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