A multi-functional tester

Abstract

The present invention provides a multi-functional tester, comprising: a plurality of indicator lights respectively corresponding to a plurality of return air systems; an automatic test module which automatically polls the circuits under test of the plurality of return air systems. If the resistance value of the circuit under test being polled is less than the reference resistance value and the circuit under test outputs a return air door feedback signal, the automatic test module drives the corresponding indicator light to light up, otherwise the indicator light corresponding to the circuit under test being polled does not light up; a manual test module for manually selecting the circuit under test connected to the tester and measuring the resistance value of the circuit under test. The manual test module is also used to connect the tester and a wind valve actuator to be measured, and indicates the open and closed states of the return air door corresponding to the wind valve actuator through two of the plurality of indicator lights; a switching module for switching between the automatic test mode and the manual test mode.

Description

Technical Field

[0001] The present invention relates to the technical field of train equipment detection, and particularly relates to a multi-functional tester. Background Art

[0002] Trains usually include multiple air-conditioning units, and each air-conditioning unit includes multiple damper actuators and multiple return air doors. The damper actuators are used to drive the corresponding return air doors to rotate to open or close the return air doors. The opening and closing states of the air doors can be known through the feedback signals output by the feedback terminals of the damper actuators. If no corresponding feedback signal is received within a set time after inputting a driving signal to open the return air door to the damper actuator, a fault alarm is given.

[0003] There are various reasons for generating a fault alarm: 1) There are slight deviations in the cooperation between the damper actuator and the return air door, and these deviations will accumulate, causing misalignment and thus reporting a fault. 2) Poor contact of each component in the loop where the feedback signal is located and the damper actuator not swinging in place will both generate a fault alarm. 3) Since the feedback signal input to the air-conditioning controller is a weak electrical signal, there are certain requirements for the resistance of the damper actuator. In the loop for transmitting the feedback signal between the air door actuator and the air-conditioning controller, there are relatively many corresponding connector interfaces, which will also generate a certain contact resistance, thus causing a fault alarm.

[0004] The air-conditioning units are installed on the train roof, and it is impossible to directly observe the working states of the various components of the damper actuator, nor can a multimeter be used for measurement. Therefore, it brings certain difficulties to troubleshooting. Since preventive maintenance and component replacement cannot be achieved, usually after a fault occurs on the train main line, fault repair is carried out after the train returns to the depot. The maintenance labor cost is high, and the train operation reliability is reduced.

[0005] Therefore, we hope to provide a multi-functional tester that can help maintenance personnel quickly judge the specific reasons for the faults of the train return air doors; it can also be used for preventive testing of the feedback signals of the damper actuators usually to detect the working states of the various components and lines in the loop where the feedback signal is located, as a technical basis for replacing and adjusting components and maintaining the corresponding loop, and it can also be used to assist in adjusting the opening and closing positions of the damper actuators. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-functional tester that can automatically and manually detect multiple damper actuators and multiple return air doors of a single train, help maintenance personnel quickly judge the specific reasons for the faults of the return air system of the train air-conditioning unit, and can be used for daily preventive testing and assist in adjusting the opening and closing positions of the damper actuators.

[0007] To achieve the above object, the present invention provides a multi-functional tester. A single train car includes multiple air-conditioning units, and each air-conditioning unit includes multiple return air systems. The feedback terminals of multiple air valve actuators in the return air system are connected in series to form a circuit under test for the return air system, so as to output a return air door feedback signal of the return air system. The multi-functional tester includes:

[0008] Multiple indicator lights, corresponding to the multiple return air systems respectively;

[0009] An automatic test module, whose input terminal is connected to the output terminals of the multiple circuits under test, and whose output terminal is connected to the multiple indicator lights; the automatic test module automatically polls the circuits under test of the multiple return air systems. If the resistance value of the polled circuit under test is less than a set reference resistance value and the circuit under test outputs a return air door feedback signal, the automatic test module drives the corresponding indicator light to light up; otherwise, the indicator light corresponding to the polled circuit under test does not light up;

[0010] A manual test module, which is used to manually select the circuit under test connected to the tester and measure the resistance value of the circuit under test; the manual test module is also used to connect the tester and a measured air valve actuator, and indicate the open and closed states of the return air door corresponding to the air valve actuator through two of the multiple indicator lights;

[0011] A switching module, which is used to switch between the automatic test mode and the manual test mode.

[0012] Optionally, a single train car includes two air-conditioning units, namely the first and second air-conditioning units; each air-conditioning unit includes two return air systems; the return air system includes two return air doors and two air valve actuators; the two air valve actuators are used to drive the two return air doors to rotate synchronously; the air valve actuator includes feedback terminals S1, S2, and S3, where S1 / S2 is in the normally closed state and S1 / S3 is in the normally open state; when the opening angle of the return air door is greater than a set angle value, the feedback terminal S1 / S3 of the corresponding air valve actuator closes.

[0013] Optionally, the two air valve actuators include a first air valve actuator and a second air valve actuator. The feedback terminal S3 of the first air valve actuator is connected to the feedback terminal S1 of the second air valve actuator; the feedback terminals S1 of the first air valve actuators of the four return air systems are commonly short-circuited to be the common terminal of the circuit under test; the feedback terminal S3 of the second air valve actuator is used as the output terminal of the corresponding circuit under test to output the corresponding return air door feedback signal.

[0014] Optionally, the multi-functional tester further includes a first input interface, which includes 5 access terminals, namely the first to fifth access terminals; the first and second access terminals are respectively connected to the output ends of two circuits to be measured of the first air conditioner unit, the third and fourth access terminals are respectively connected to the output ends of two circuits to be measured of the second air conditioner unit, and the fifth access terminal is connected to the common end of the circuit to be measured.

[0015] Optionally, the automatic test module includes: an oscillator unit, a shift register unit, a signal blocking control unit, a reverse signal output unit, and a signal restoration unit;

[0016] The oscillator unit is used to output a first pulse signal with a set frequency;

[0017] The shift register unit includes output terminals Q0 to Q3; the first pulse signal triggers one of Q0 to Q3 in sequence to output a second pulse signal with a high level; the output terminals Q0 to Q3 are triggered sequentially and cyclically;

[0018] The signal blocking control unit includes: input terminals M1 to M4 and output terminals N1 to N4; the input terminals M1 to M4 are respectively connected to the first to fourth access terminals, and the output terminals N1 to N4 respectively correspond to the input terminals M1 to M4; the signal blocking control unit is configured as follows: if the resistance value of the circuit to be measured is less than the set reference resistance value, a high-level signal is output from the output terminal of the signal blocking control unit corresponding to the circuit to be measured; otherwise, no output signal is output from the output terminal of the signal blocking control unit corresponding to the circuit to be measured;

[0019] The reverse signal output unit includes input terminals 1A to 4A, 1B to 4B, and output terminals 1Y to 4Y; the input terminals 1A to 4A are respectively connected to the output terminals Q0 to Q3, and the input terminals 1B to 4B are respectively connected to the output terminals N1 to N4; the reverse signal output unit is configured as follows:

[0020] When and only when both the input terminals 1A and 1B output high-level signals, the output terminal 1Y outputs a low-level signal; otherwise, the output terminal 1Y outputs a high-level signal;

[0021] When and only when both the input terminals 2A and 2B output high-level signals, the output terminal 2Y outputs a low-level signal; otherwise, the output terminal 2Y outputs a high-level signal;

[0022] When and only when both the input terminals 3A and 3B output high-level signals, the output terminal 3Y outputs a low-level signal; otherwise, the output terminal 3Y outputs a high-level signal;

[0023] When and only when both the input terminals 4A and 4B output high-level signals, the output terminal 4Y outputs a low-level signal; otherwise, the output terminal 3Y outputs a high-level signal;

[0024] The signal restoration unit is used to convert the high / low level signals output from output terminals 1Y to 4Y into low / high level signals, and respectively supply them to the corresponding 4 indicating lamps; the corresponding indicating lamps are driven to light up by the high level signals.

[0025] Optionally, the manual test module includes: a to-be-tested circuit selection knob, a resistance meter, and a display screen; the to-be-tested circuit selection knob includes: a common contact and four selection contacts; the common contact is connected to the positive pole of the signal end of the resistance meter, the four selection contacts are respectively connected to the first to fourth access terminals, and the negative pole of the signal end of the resistance meter is connected to the fifth access terminal; the resistance value of the to-be-tested circuit connected to the common contact is measured by the resistance meter; the display screen is used to display the resistance value measured by the resistance meter.

[0026] Optionally, the multifunctional tester further includes a working power supply, which is used to provide working electrical energy for the oscillator unit, the shift register unit, the reverse signal output unit, the signal restoration unit, and the resistance meter.

[0027] Optionally, the manual test module further includes a second input interface; the second input interface includes first, second, and third input terminals; the feedback terminal S1 of the to-be-tested damper actuator is connected to the positive pole of the working power supply through the first input terminal; the feedback terminals S2 and S3 of the to-be-tested damper actuator are respectively connected to the corresponding indicating lamps through the second and third input terminals.

[0028] Optionally, the switching module includes: a first switching switch and a second switching switch; the first switching switch is connected to the positive pole of the working power supply, the automatic test module, and the positive pole of the power supply end of the resistance meter; the second switching switch is connected to the negative pole of the power supply end of the resistance meter, the negative pole of the working power supply, and the fifth access terminal; by cooperating the first switching switch and the second switching switch, it is realized to control the working power supply to supply power to the resistance meter or the automatic test module.

[0029] Optionally, the multifunctional tester further includes a power switch, which is electrically connected between the positive pole of the working power supply and the first switching switch.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] Faults in the air damper of train air conditioners account for more than 90% of air conditioner faults. It is difficult to carry out normal maintenance and diagnose faults after they occur, which reduces the operational reliability of trains and increases the manual maintenance cost. With the multi-functional tester of the present invention, the working status and performance of all return air dampers of two air conditioner units of a single train can be detected online simultaneously in the automatic detection mode, and the cause and location of faults in the return air system of the air conditioner unit can be quickly determined. At the same time, the multi-functional tester of the present invention can also independently detect the air valve actuator in the manual detection mode and assist in adjusting the corresponding position of the air valve actuator. The multi-functional tester of the present invention can also test the resistance value of the circuit to be measured in the return air system in the manual mode, and this resistance value can be used as a basis for maintaining and replacing components and circuits. The present invention greatly saves the maintenance labor cost and significantly reduces the failure rate of train air conditioners. Description of the Drawings

[0032] In order to more clearly illustrate the technical solution of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are an embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:

[0033] Figure 1 It is a top view of the distribution of air conditioner units in an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of each component of the air conditioner unit in an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of the air inlet and outlet of the air conditioner unit in an embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of the return air damper actuator of the air conditioner unit in an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of the feedback signal output terminal and drive signal input terminal of the air valve actuator in an embodiment of the present invention;

[0038] Figure 6 It is a circuit diagram of two air conditioner units in a single carriage in the present invention;

[0039] Figure 7 It is a circuit diagram of the four-way return air damper feedback signal input to the interface P11 of the air conditioner controller in a single carriage in the present invention;

[0040] Figure 8 It is a schematic diagram of the multi-functional tester of the present invention;

[0041] Figure 9In the embodiment of the present invention, it is the circuit diagram of the automatic test module of the multifunctional tester;

[0042] Figure 10 In the embodiment of the present invention, it is the schematic diagram of the first connecting wire;

[0043] Figure 11 In the embodiment of the present invention, it is the schematic diagram of the connection relationship between each access terminal of the first input interface and each input terminal of the interface of the air conditioner controller;

[0044] Figure 12 In the embodiment of the present invention, it is the circuit diagram of the 555 oscillator;

[0045] Figure 13 In the embodiment of the present invention, it is the function diagram of the 4017 chip;

[0046] Figure 14 In the embodiment of the present invention, it is the function diagram of the LM358 chip;

[0047] Figure 15 In the embodiment of the present invention, it is the working principle diagram of the LM358 chip;

[0048] Figure 16 In the embodiment of the present invention, it is the function diagram of the 4011 chip;

[0049] Figure 17 In the embodiment of the present invention, it is the circuit diagram of the manual test module;

[0050] Figure 18 In the embodiment of the present invention, it is the schematic diagram of the connection relationship between each access terminal of the second input interface and each feedback terminal of the air valve actuator;

[0051] Figure 19 In the embodiment of the present invention, it is the schematic diagram of the second connecting wire;

[0052] Figure 20 In the embodiment of the present invention, it is the circuit diagram for manually testing a single air valve actuator. Detailed implementation manners

[0053] 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 only a part of the embodiments of the present invention, rather than all the 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.

[0054] Each carriage of the train usually contains one air-conditioning controller and two independent air-conditioning units 100 (denoted as the first air-conditioning unit and the second air-conditioning unit). In this embodiment, the train model is 07A01, and the air-conditioning controller uses an FPC24 / 2 type microprocessor. As Figure 1 shown, the two air-conditioning units 100 are arranged on the carriage roof, and the distances between the two air-conditioning units 100 and the front end of the carriage are 1 / 4 and 3 / 4 of the carriage length respectively.

[0055] As Figure 2 shown, the air-conditioning unit 100 includes components such as a compressor 1, a condenser 2, an evaporator 3, a supply fan 4, a return air door 5, a fresh air filter screen 6, a return air filter screen 7, a dryer filter 8, a charging valve 9, a sight glass 10, a solenoid valve 11, and an expansion valve 12. The quantities of each component are shown in Table 1.

[0056] Number Name Quantity Number Name Quantity 1 Compressor 2 7 Return air filter 2 2 Condenser 2 8 Drier filter 2 3 Evaporator 2 9 Charging valve 2 4 Supply fan 2 10 Liquid sight glass 2 5 Return air door 4 11 Solenoid valve 2 6 Fresh air filter 4 12 Expansion valve 2

[0057] Table 1

[0058] As Figure 3 shown, fresh air enters the air-conditioning unit 100 through 4 grid-type fresh air inlets on the side of the air-conditioning unit, mixes with the return air from the passenger compartment, and the return air enters the air-conditioning unit through the return air inlets at both ends. The cooled mixed air is sent into the air duct system of the passenger compartment.

[0059] The air-conditioning unit of each carriage is controlled by the corresponding air-conditioning controller. By sending commands to each component of the air-conditioning unit through the air-conditioning controller, it is ensured that the required set temperature is maintained inside the vehicle, so that the air-conditioning system of the train operates safely within the design limit. The air-conditioning controller is connected to the train information system through the MVB (Multifunction Vehicle Bus) to provide signals for starting and stopping the system, as well as fault data and diagnostic information that meet the train standards.

[0060] The air-conditioning unit 100 includes two sets of independent return air systems, which are respectively arranged at both ends of the air-conditioning unit 100. Each set of return air systems includes two return air doors 5 and two air valve actuators corresponding to the two return air doors 5 respectively. As Figure 4 shown, two air valve actuators 101, 102 of the first air-conditioning unit and two return air doors 5 corresponding to the air valve actuators 101, 102 are shown. The air valve actuator and the corresponding return air door 5 are connected by a connecting rod to adjust the return air volume entering the air-conditioning unit 100. According to the air-conditioning control mode, ambient temperature, and return air temperature, the air-conditioning controller sends a driving signal to the air valve actuator, and the air valve actuator adjusts the swinging angle of the return air door 5 based on the received driving signal. The angle of the return air door 5 will determine the return air volume entering the air-conditioning unit 100. In the emergency mode, the return air door 5 is completely closed.

[0061] AsFigure 5 As shown, the air valve actuator mainly includes: a driving motor ( Figure 5 not shown in the figure), a feedback signal output terminal FK (including feedback terminals S1, S2, S3), a driving signal input terminal QD (including driving terminals 01, 02, 03), and an actuator. When the return air damper 5 is in the closed state, the feedback terminals S1 and S2 are normally closed terminals, and S1 and S3 are normally open terminals. When a driving signal is input to the air valve actuator through the driving terminals 01, 02, and 03, the driving motor drives the actuator to rotate, causing the return air damper 5 connected to the air valve actuator to open. When the return air damper 5 rotates to a fixed position, it stops rotating. When the return air damper 5 opens by more than a certain angle (e.g., 45 degrees), the feedback terminals S1 / S3 change from normally open to normally closed, and the feedback terminals S1 / S3 output corresponding feedback signals.

[0062] In one embodiment, each air valve actuator independently outputs a corresponding feedback signal to the air conditioner controller. After the air conditioner controller inputs a driving signal to the air valve actuator, if the air conditioner controller reads the feedback signal output by the air valve actuator within the set time, it is confirmed that the corresponding return air damper 5 is fully opened; if the air conditioner controller cannot read the feedback signal of the air valve actuator within the set time, it means that the feedback terminals S1 / S3 of the air valve actuator are still in the normally open state, and it is defaulted that the corresponding return air damper 5 is in the unopened state, and the air conditioner controller issues a fault alarm.

[0063] In the present invention, the air conditioner controller inputs the same driving signal to two air valve actuators of the corresponding return air system at the same time, and the two return air dampers 5 of the return air system open and close synchronously. The feedback signals of the two air valve actuators of the return air system are connected in series as the return air damper feedback signal of the return air system (one return air system outputs one return air damper feedback signal), and the air conditioner controller determines the open / closed state of the corresponding two return air dampers 5 at one time based on this return air damper feedback signal.

[0064] As Figure 6 shown, one return air system of the first air conditioner unit includes air valve actuators 101 and 102. Another return air system of the first air conditioner unit includes air valve actuators 103 and 104.

[0065] The feedback terminal S3 of the air valve actuator 101 is connected in series with the feedback terminal S1 of the air valve actuator 102, and the corresponding return air door feedback signal 1-1 is output through the feedback terminal S1 of the air valve actuator 101 and the feedback terminal S3 of the air valve actuator 102. The feedback loop of the return air door feedback signal 1-1 is formed between the feedback terminal S1 of the air valve actuator 101 and the feedback terminal S3 of the air valve actuator 102. The feedback terminal S3 of the air valve actuator 103 is connected in series with the feedback terminal S1 of the air valve actuator 104, and the corresponding return air door feedback signal 1-2 is output through the feedback terminal S1 of the air valve actuator 103 and the feedback terminal S3 of the air valve actuator 104. The feedback loop of the return air door feedback signal 1-2 is formed between the feedback terminal S1 of the air valve actuator 103 and the feedback terminal S3 of the air valve actuator 104.

[0066] One return air system of the second air conditioner unit includes air valve actuators 201 and 202. Another return air system of the second air conditioner unit includes air valve actuators 203 and 204.

[0067] The feedback terminal S3 of the air valve actuator 201 is connected in series with the feedback terminal S1 of the air valve actuator 202, and the corresponding return air door feedback signal 2-1 is output through the feedback terminal S1 of the air valve actuator 201 and the feedback terminal S3 of the air valve actuator 202. The feedback loop of the return air door feedback signal 2-1 is formed between the feedback terminal S1 of the air valve actuator 201 and the feedback terminal S3 of the air valve actuator 202. The feedback terminal S3 of the air valve actuator 203 is connected in series with the feedback terminal S1 of the air valve actuator 204, and the corresponding return air door feedback signal 2-2 is output through the feedback terminal S1 of the air valve actuator 203 and the feedback terminal S3 of the air valve actuator 204. The feedback loop of the return air door feedback signal 2-2 is formed between the feedback terminal S1 of the air valve actuator 203 and the feedback terminal S3 of the air valve actuator 204..

[0068] As Figure 7 shown, the 4 return air door feedback signals of 2 air conditioner units of a single-section train are fed back to the interface P11 of the air conditioner controller of this section of the train through connecting wires. In this embodiment, the interface P11 is a 16-pin interface and has input terminals Among them, the input terminals A1, A2, A3, and A4 are respectively connected to the feedback terminals S3 of the damper actuators 102, 104, 202, and 204 through wires with wire numbers 1212, 1214, 1216, and 1218. The feedback terminals S1 of the damper actuators 101, 103, 201, and 203 are respectively connected to the input terminals B1, B2, B3, and B4 of the air-conditioning controller through wires with wire numbers 1213, 1215, 1217, and 1219, and are short-circuited through the input terminals B1, B2, B3, and B4. The air-conditioning controller performs fault alarm based on the received return air door feedback signals 1-1, 2-2, 2-1, and 2-2. For example, when the air-conditioning controller simultaneously sends drive signals to the drive terminals of the damper actuators 101 and 102, but does not receive the corresponding return air door feedback signal 1-1 within the set time, the air-conditioning controller performs a fault alarm.

[0069] There are many reasons for the air-conditioning controller to perform a fault alarm, including: 1) There are slight deviations in the cooperation between the damper actuator and the return air door 5, and this deviation will accumulate, causing misalignment and resulting in a fault alarm. 2) Poor contact of each component in the air door feedback signal circuit, and the damper actuator not swinging in place will also generate a fault alarm. 3) Since the return air door feedback signal input to the air-conditioning controller is a weak electric signal, there are certain requirements for the resistance of the feedback circuit. In the feedback circuit for transmitting the return air door feedback signal between the damper actuator and the air-conditioning controller, there are relatively many corresponding plug-in interfaces, which will also generate a certain contact resistance, thus causing a fault alarm.

[0070] The air-conditioning unit is installed on the train roof, and it is impossible to directly observe the working status of each component of the damper actuator, nor can a multimeter be used for measurement. Therefore, it brings certain difficulties to troubleshooting. Since preventive maintenance and component replacement cannot be achieved, usually after a fault occurs on the train main line, fault repair is carried out after the train returns to the depot. The maintenance labor cost is high, and the train operation reliability is reduced.

[0071] Therefore, we hope to provide a multi-functional tester that can help maintenance personnel quickly judge the specific cause of the train return air door 5 fault; and can perform preventive tests on the working status of each component and circuit on the feedback loop, as a technical basis for replacing and adjusting the corresponding components and maintaining the corresponding circuit; at the same time, it can also meet the manual detection requirements of all return air doors 5 in the train carriage.

[0072] The present invention provides a multi-functional tester, as Figure 8 shown, including: a first input interface SR1, multiple indicator lights, an automatic test module, a manual test module, a switching module, a working power supply, and a power switch K4.

[0073] The feedback loop of the return air door feedback signal in the present invention is used as the circuit to be measured. The multi-functional tester of the present invention tests the four circuits to be measured of two air-conditioning units in a single train carriage.

[0074] As Figure 8 , Figure 9 shown, the first input interface SR1 includes 5 access terminals, namely the first to fifth access terminals a1 to a5. Through Figure 10 the first connecting wire shown, the first input interface SR1 is connected to the interface P11 of the air-conditioning controller. The connection relationship between the access terminals of the first input interface SR1 and the input terminals of the interface P11 of the air-conditioning controller is as Figure 11 shown. In this embodiment, the first end of the first connecting wire is a GX16-5-core aviation docking plug female head (inserted into the first input interface SR1), and the second end of the first connecting wire is a 16-pin connector (inserted into the interface P11).

[0075] As Figure 7 , Figure 9 shown, the first access terminal a1 and the second access terminal a2 respectively input the return air door feedback signals 1-1 and 1-2 of the first air-conditioning unit through the input terminals A1 and A2 of the interface P11. The third access terminal a3 and the fourth access terminal a4 respectively input the return air door feedback signals 2-1 and 2-2 of the second air-conditioning unit through the input terminals A3 and A4 of the interface P11. As Figure 7 , Figure 9 shown, the wires numbered 1213, 1215, 1217, and 1219 are short-circuited through the input terminals and then connected to the fifth access terminal a5 as the common terminal of all circuits to be measured.

[0076] As Figure 8 , Figure 9 shown, this embodiment includes at least 4 indicator lights L1-1 to L1-4, which respectively correspond to 4 circuits to be measured (a carriage includes two air-conditioning units, each air-conditioning unit includes two return air systems, and one return air system corresponds to one circuit to be measured), and the indicator lights indicate whether the corresponding circuits to be measured output the return air door feedback signal.

[0077] The input end of the automatic test module is connected to the output ends of multiple circuits under test, and the output end of the automatic test module is connected to multiple indicator lights. The automatic test module automatically polls the circuits under test of multiple return air systems. If the resistance value of the circuit under test being polled is less than the set reference resistance value and the circuit under test outputs a return air door feedback signal, the automatic test module drives the corresponding indicator light to light up; if the resistance value of the circuit under test being polled is greater than the set reference resistance value, the automatic test module cuts off the return air door feedback signal of the circuit under test, and the corresponding indicator light will not light up. When the circuit under test does not output a return air door feedback signal, the corresponding indicator light of the circuit under test will not light up.

[0078] As Figure 9 shown, the automatic test module includes: an oscillator unit, a shift register unit, a signal blocking control unit, a reverse signal output unit, and a signal restoration unit.

[0079] The oscillator unit is used to output a first pulse signal with a set frequency. In this embodiment, the oscillator unit uses a 555 oscillator, and the functions of each pin are as follows: Pin 1 is ground GND; Pin 2 is trigger; Pin 3 outputs the first pulse signal; Pin 4 is reset; Pin 5 is control voltage; Pin 6 is threshold; Pin 7 is discharge; Pin 8 is power supply voltage Vcc.

[0080] As Figure 9 、 Figure 12 shown, when the 555 oscillator is powered on, the 3rd pin of the 555 outputs a high level. At the same time, the power supply charges the capacitor c through resistors R1 and R2. When the voltage on c reaches the threshold voltage (2 / 3 power supply voltage) of the 6th pin of the 555 integrated circuit, the 7th pin of the 555 discharges the electricity in the capacitor, and the 3rd pin changes from high level to low level. When the voltage of the capacitor drops to 1 / 3 power supply voltage, the 3rd pin becomes high level again, and the power supply charges the capacitor through R1 and R2 again. In this way, it cycles repeatedly to form an oscillation. The 3rd pin outputs the first pulse signal.

[0081] In this embodiment, the shift register unit uses a 4017 chip, and its function diagram is as Figure 13 shown. Among them, CO: carry pulse output terminal; CP: clock input terminal; CR: clear terminal; INH: inhibit terminal; Q0 - Q9 output terminals; VDD: positive power supply; VSS: ground.

[0082] As Figure 9As shown in the figure, in this embodiment, Q0 to Q3 are used as the output terminals of the 4017 chip. When a pulse is input to the CP terminal (connected to the 3rd pin of the 555 oscillator) of the 4017 chip's 14th pin, the output terminals Q0 to Q3 output pulses in sequence. The output signals of Q0 to Q3 are represented by a quaternion "ABCD". Among them, A, B, C, and D represent the output states of Q0, Q1, Q2, and Q3 respectively. The values of A, B, C, and D can be "0" or "1". "0" indicates no signal output, and "1" indicates a high-level signal output. For example, from the first moment to the fourth moment, the output states of Q0 to Q3 are "1000", "0100", "0010", "0001", "1000" and so on in a cycle. That is to say, the first pulse signal triggers one of Q0 to Q3 at a time, and the second pulse signal with a high level is output through the triggered output terminal. Q0 to Q3 are triggered in sequence and cyclically.

[0083] As Figure 9 shown, the signal blocking control unit includes 2 identical operational amplifiers. In this embodiment, the operational amplifier uses the LM358 chip.

[0084] The signal blocking control unit includes: input terminals M1 to M4, and output terminals N1 to N4. The input terminals M1 to M4 are respectively connected to the first to fourth access terminals, and the output terminals N1 to N4 respectively correspond to the input terminals M1 to M4. The signal blocking control unit is configured as follows: if the resistance value of the circuit under test is less than the set reference resistance value, a high-level signal is output from the output terminal of the signal blocking control unit corresponding to the circuit under test; otherwise, no signal is output from the output terminal of the signal blocking control unit corresponding to the circuit under test.

[0085] The functional diagram of the LM358 chip is as Figure 14 shown. Pin 1 is: Output 1, which is the output terminal; Pin 2 is: Input 1(—), which is the inverting input terminal; Pin 3 is: Input 1(+), which is the non-inverting input terminal; Pin 4 is: GND, the negative power supply; Pin 5 is: Input 2(+), which is the non-inverting input terminal; Pin 6 is: Input 2(—), which is the inverting input terminal; Pin 7 is: Output 2, which is the output terminal; Pin 8 is: VCC, the positive power supply.

[0086] As Figure 9 shown, the 2nd and 6th pins of one of the LM358 chips are used as the input terminals M1 and M2 of the signal blocking control unit, and the 1st and 7th pins of this LM358 chip are used as the output terminals N1 and N2. The 2nd and 6th pins of the other LM358 chip are used as the input terminals M3 and M4 of the signal blocking control unit, and the 1st and 7th pins of this LM358 chip are used as the output terminals N3 and N4.

[0087] As Figure 15As shown, based on the return air door feedback signal 1-1 input by the first access terminal a1, the working principle of the LM358 chip is described ( Figure 15 The LM358 chip in Figure 15 , and other components unrelated to the return air door feedback signal 1-1 are not shown): Pins 8 and 4 of the LM358 chip are the power input terminals of the chip, connected to the positive and negative poles of the working power supply respectively. The voltage of the working power supply is divided by the reference resistor R3 (20 ohms in this embodiment) and then connected to pin 3, and the reference voltage Ur is obtained at pin 3. Pin 2 is used as the inverting input terminal, connected to the input signal Ui (that is, the return air door feedback signal 1-1), and pin 3 is used as the non-inverting input terminal. As shown in the right figure of

[0088] As Figure 15 shown, as long as the input voltage Ui is slightly greater than the reference voltage Ur, the output voltage Uo of pin 1 is 0 volts; as long as the input voltage Ui is slightly less than the reference voltage Ur, the output voltage Uo is the positive power supply voltage Vcc. In this circuit, R2 and R3 are connected in series and then connected to the non-inverting input terminal pin 3, and R1 and the measured resistor (the resistor of the circuit to be measured corresponding to the return air door feedback signal 1-1) are connected in series and then connected to the inverting input terminal pin 2. When R1 = R2, if the measured resistor is less than R3, the input voltage Ui is less than the reference voltage Ur, and the output voltage Uo outputs the power supply voltage Vcc; if the measured resistor is greater than R3, the input voltage Ui is greater than the reference voltage Ur, and the output voltage Uo outputs a voltage of 0 volts.

[0089] The reverse signal output unit of the present invention uses a 4011 chip. As shown in Figure 16 , it includes input terminals 1A~4A, 1B~4B, and output terminals 1Y~4Y; input terminals 1A~4A are respectively connected to output terminals Q0~Q3, and input terminals 1B~4B are respectively connected to output terminals N1~N4. The logical expression: Y = A.B non.

[0090] That is, the reverse signal output unit is configured as:

[0091] When and only when both input terminals 1A and 1B output high-level signals, output terminal 1Y outputs a low-level signal; otherwise output terminal 1Y outputs a high-level signal;

[0092] When and only when both input terminals 2A and 2B output high-level signals, output terminal 2Y outputs a low-level signal; otherwise output terminal 2Y outputs a high-level signal;

[0093] Only when both input terminals 3A and 3B output high-level signals, the output terminal 3Y outputs a low-level signal; otherwise, the output terminal 3Y outputs a high-level signal.

[0094] Only when both input terminals 4A and 4B output high-level signals, the output terminal 4Y outputs a low-level signal; otherwise, the output terminal 3Y outputs a high-level signal.

[0095] As Figure 9 shown, the signal restoration unit uses a 4069 chip. The 1st, 3rd, 5th, and 9th pins of the 4069 chip are respectively connected to the output terminals 1Y, 2Y, 3Y, and 4Y. The 4069 chip is used to convert the high / low-level signals output by the output terminals 1Y to 4Y into low / high-level signals, and supply them to the corresponding 4 indicator lights L 1-1 ~L 1-4 through the 2nd, 4th, 6th, and 8th pins of the 4069 chip respectively. The corresponding indicator lights are driven to light up by high-level signals.

[0096] Summary of the automatic measurement principle:

[0097] The first to fourth access terminals a1 to a4 respectively input the return air door feedback signals 1-1, 1-2, 2-1, and 2-2. The fifth access terminal a5 is the common terminal of the circuit to be measured and is connected to the negative pole of the working power supply. Two operational amplifiers LM358 form a 4-channel comparison circuit to compare the resistances of the 4 circuits to be measured in a single train with the reference resistance of the operational amplifier. If the resistance value of the circuit to be measured is less than the reference resistance value, the corresponding output terminal of the LM358 outputs "1" (high level), and does not block the corresponding return air door feedback signal; if the resistance value of the circuit to be measured is greater than the reference resistance value, then the return air door feedback signal of this path is blocked (the corresponding output terminal of the LM358 outputs "0"). When a certain return air door feedback signal is not received and the components of the circuit to be measured are in poor contact, the corresponding output signal of the LM358 is also "0", and the corresponding indicator light goes out, indicating that there are faults and potential hazards in the corresponding return air system. The 555 oscillator provides the first pulse signal for the 4017, and stimulates the Q0 to Q3 of the chip 4017 to cyclically shift and output the second pulse signal (for polling the circuit to be measured), and this second pulse signal is then input to the corresponding input terminal of the 4011 chip. The 4011 gate circuit is composed of two signals. The A signal comes from the second pulse signal of the output terminals Q0 to Q3 of the chip 4017, and the B signal comes from the output terminal of the LM358. Therefore, the output signal of the 4011 is controlled by the output terminal of the LM358. Only when the circuit to be measured is polled and the circuit to be measured is not blocked, the corresponding output terminal of the chip 4011 outputs "0". The output signal of the chip 4011 is then inversely output through the chip 4069. When the output of the chip 4069 is high level, each light-emitting diode is driven through a current-limiting resistor, and thus the input of each circuit to be measured is automatically cycled and scanned repeatedly.

[0098] The manual test module is used to manually select the circuit under test connected to the tester and measure the resistance value of the circuit under test; the manual test module is also used to connect the tester and a damper actuator to be measured, and two of the multiple indicator lights are used to indicate the open and closed states of the corresponding return air door 5 of the damper actuator.

[0099] As Figure 8 , Figure 17 shown, the manual test module includes: a second input interface SR2, a circuit-under-test selection knob K3, a resistance meter 700, and a display screen XSP.

[0100] As Figure 18 shown, the second input interface SR2 (a male GX16-3 core aviation docking plug in this embodiment) includes first to third input terminals b~b3. Through the second connecting wire as Figure 19 shown, manually connect the feedback terminal of a damper actuator and the second input interface SR2. The connection relationship between each feedback terminal of the damper actuator and each input terminal of the second input interface SR2 is as Figure 18 shown.

[0101] As Figure 20 shown, the feedback terminal S1 of the damper actuator to be measured is connected to the positive pole of the working power supply through the first input terminal; the feedback terminals S2 and S3 of the damper actuator to be measured are respectively connected to the corresponding indicator lights through the second and third input terminals. When the indicator light corresponding to the feedback terminal S3 is on, it indicates that the return air door 5 is opened; when the indicator light corresponding to the feedback terminal S2 is on, it indicates that the return air door 5 is closed. The damper actuator can be adjusted by observing the indicator lights of the tester, and it can be directly seen whether the current state of the damper actuator corresponds to the state of the air door. For example, if the state of the return air door 5 is closed, but the tester shows that the return air door 5 is open, then the damper actuator needs to be adjusted until the tester shows that the return air door is closed.

[0102] As Figure 17 shown, the circuit-under-test selection knob K3 includes: a common contact and four selection contacts. The common contact is connected to the positive pole of the signal end of the resistance meter 700, and the four selection contacts are respectively connected to the first to fourth access terminals. The negative pole of the signal end of the resistance meter 700 is connected to the fifth access terminal. The resistance value of the circuit under test connected to the common contact is measured by the resistance meter 700; the display screen XSP is used to display the resistance value measured by the resistance meter 700.

[0103] The switching module is used to switch between the automatic test mode and the manual test mode. As Figure 8 , Figure 9 , Figure 17As shown in the figure, the switching module includes: a first switching switch K1 and a second switching switch K2. The first switching switch is connected to the positive pole of the working power supply, the automatic test module, and the positive pole of the power supply terminal of the ohmmeter 700; the second switching switch is connected to the negative pole of the power supply terminal of the ohmmeter 700, the negative pole of the working power supply, and the fifth access terminal; through the cooperation of the first switching switch K1 and the second switching switch K2, it is realized to control the working power supply to supply power to the ohmmeter 700 or the automatic test module.

[0104] The power switch is electrically connected between the positive pole of the working power supply and the first switching switch K1.

[0105] When testing with the tester of the present invention, the following steps are included:

[0106] S1. Connect the first input interface SR1 of the tester and the P11 interface of the air conditioner controller through the first connecting wire.

[0107] S2. Turn on the working power switch of the tester, select the "automatic" gear for the first switching switch K1, and select the "automatic" gear for the second switching switch K2.

[0108] S3. Observe the four indicator lights L 1-1 ~L 1-4 (corresponding to the return air door feedback signals 1-1, 1-2, 2-1, 2-1 respectively). If the indicator lights light up repeatedly in a cycle, it means that each return air door 5 is in the open state and has good performance. If an indicator light does not light up, go to step S4;

[0109] S4. Adjust the tester to the manual test state, select the "manual" gear for the first switching switch K1, and select the "manual" gear for the second switching switch K2; rotate the test circuit selection knob K3 to the test circuit corresponding to the fault, and observe the reading of the display screen XSP, so as to accurately judge the working state of the corresponding test circuit. (Poor contact or open circuit)

[0110] S5. After the test is completed, turn off the power switch K4 and press the power switch K4 to the 0 position.

[0111] When adjusting the position of a single air valve actuator, the following steps are included:

[0112] H1. Turn on the power switch K4 of the tester, and connect the feedback terminal of the air valve actuator and the second input interface SR2 through the second connecting wire for testing.

[0113] H2. Send a drive signal to the corresponding air valve actuator, and observe the "return air door open" and "return air door closed" indicator lights of the tester by opening and closing the return air door 5. If there is a matching deviation between the air valve actuator and the return air door, adjust the air valve actuator.

[0114] As described above, it 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 be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A multifunctional tester. A single train car includes multiple air-conditioning units, and each air-conditioning unit includes multiple return air systems. The feedback terminals of multiple air damper actuators in the return air systems are connected in series to form a circuit under test for the return air system. A return air door feedback signal corresponding to the return air system is output through the output terminal of the circuit under test. It is characterized in that, The multifunctional tester includes: A plurality of indicator lights, respectively corresponding to the plurality of return air systems; An automatic test module, whose input end is connected to the output ends of the plurality of circuits to be tested, and whose output end is connected to the plurality of indicator lights; the automatic test module automatically polls the circuits to be tested of the plurality of return air systems. If the resistance value of the circuit to be tested being polled is less than the set reference resistance value, and the circuit to be tested outputs a return air door feedback signal, the automatic test module drives the corresponding indicator light to light up; otherwise, the indicator light corresponding to the circuit to be tested being polled does not light up; A manual test module, which is used to manually select the circuit to be tested connected to the tester and measure the resistance value of the circuit to be tested; the manual test module is also used to connect the tester and a wind valve actuator to be tested, and indicate the open and closed states of the return air door corresponding to the wind valve actuator through two of the plurality of indicator lights; A switching module, which is used to switch between the automatic test mode and the manual test mode; Each air conditioner unit includes two return air systems; each return air system includes two return air doors and two wind valve actuators; the two wind valve actuators respectively drive the two return air doors to rotate synchronously; the wind valve actuator includes feedback terminals S1, S2, S3, where S1 / S2 is in a normally closed state and S1 / S3 is in a normally open state; when the opening angle of the return air door is greater than the set angle value, the feedback terminal S1 / S3 of the corresponding wind valve actuator closes; the two wind valve actuators include a first wind valve actuator and a second wind valve actuator, and the feedback terminal S3 of the first wind valve actuator is connected to the feedback terminal S1 of the second wind valve actuator; the feedback terminals S1 of the first wind valve actuators of the four return air systems are commonly short-circuited as the common end of the circuit to be tested; the feedback terminal S3 of the second wind valve actuator is used as the output end of the corresponding circuit to be tested to output the corresponding return air door feedback signal; A first input interface, which includes 5 access terminals, namely the first to fifth access terminals; the plurality of air conditioner units include a first air conditioner unit and a second air conditioner unit; The first and second access terminals are respectively connected to the output ends of the two circuits to be tested of the first air conditioner unit, the third and fourth access terminals are respectively connected to the output ends of the two circuits to be tested of the second air conditioner unit, and the fifth access terminal is connected to the common end of the circuit to be tested; The automatic test module includes: an oscillator unit, a shift register unit, a signal blocking control unit, a reverse signal output unit, and a signal restoration unit; The oscillator unit is used to output a first pulse signal with a set frequency; The shift register unit includes output terminals Q0 to Q3; the first pulse signal triggers one of Q0 to Q3 at a time to output a second pulse signal with a high level; the output terminals Q0 to Q3 are triggered in sequence and cyclically; The signal blocking control unit includes: input terminals M1 to M4, and output terminals N1 to N4; the input terminals M1 to M4 are respectively connected to the first to fourth access terminals, and the output terminals N1 to N4 respectively correspond to the input terminals M1 to M4; the signal blocking control unit is configured to: if the resistance value of the circuit under test is less than the set reference resistance value, a high-level signal is output at the output terminal of the signal blocking control unit corresponding to the circuit under test; otherwise, no output signal is output at the output terminal of the signal blocking control unit corresponding to the circuit under test; The reverse signal output unit includes input terminals 1A to 4A, 1B to 4B, and output terminals 1Y to 4Y; the input terminals 1A to 4A are respectively connected to the output terminals Q0 to Q3, and the input terminals 1B to 4B are respectively connected to the output terminals N1 to N4; the reverse signal output unit is configured to: when and only when both input terminals 1A and 1B output high-level signals, the output terminal 1Y outputs a low-level signal; otherwise the output terminal 1Y outputs a high-level signal; when and only when both input terminals 2A and 2B output high-level signals, the output terminal 2Y outputs a low-level signal; otherwise the output terminal 2Y outputs a high-level signal; when and only when both input terminals 3A and 3B output high-level signals, the output terminal 3Y outputs a low-level signal; otherwise the output terminal 3Y outputs a high-level signal; when and only when both input terminals 4A and 4B output high-level signals, the output terminal 4Y outputs a low-level signal; otherwise the output terminal 3Y outputs a high-level signal; The signal restoration unit is used to convert the high / low level signals output by the output terminals 1Y to 4Y into low / high level signals, and respectively provide them to the corresponding 4 indicator lights; the corresponding indicator lights are driven to light up by high-level signals.

2. The multi-functional tester according to claim 1, wherein, The manual test module includes: a circuit under test selection knob, a resistance meter, and a display screen; the circuit under test selection knob includes: a common contact and four selection contacts; the common contact is connected to the positive pole of the signal end of the resistance meter, and the four selection contacts are respectively connected to the first to fourth access terminals, and the negative pole of the signal end of the resistance meter is connected to the fifth access terminal; the resistance value of the circuit under test connected to the common contact is measured by the resistance meter; the display screen is used to display the resistance value measured by the resistance meter.

3. The multi-functional tester according to claim 2, characterized in that, It also includes a working power supply for providing working electrical energy for the oscillator unit, shift register unit, reverse signal output unit, signal restoration unit, and resistance meter.

4. The multi-functional tester according to claim 3, wherein The manual test module also includes a second input interface; the second input interface includes first, second, and third input terminals; the feedback terminal S1 of the measured damper actuator is connected to the positive pole of the working power supply through the first input terminal; the feedback terminals S2 and S3 of the measured damper actuator are respectively connected to the corresponding indicator lights through the second and third input terminals.

5. The multifunctional tester according to claim 3, characterized in that, The switching module includes: a first switching switch and a second switching switch; the first switching switch is connected to the positive pole of the working power supply, the automatic test module, and the positive pole of the power supply terminal of the resistance meter; the second switching switch is connected to the negative pole of the power supply terminal of the resistance meter, the negative pole of the working power supply, and the fifth access terminal; by cooperating the first switching switch and the second switching switch, it is realized to control the working power supply to supply power to the resistance meter or the automatic test module.

6. The multifunctional tester according to claim 5, characterized in that, It also includes a power switch, which is electrically connected between the positive pole of the working power supply and the first switching switch.

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