Temperature control method, device, computer equipment and medium of temperature control system

Abstract

The present invention provides a temperature control method, device, computer equipment and medium of a temperature control system, which relates to the field of automatic control technology, wherein the method comprises the following steps: connecting the lubricating oil temperature control system with the supply and return oil paths of the lubricating oil system of a rotor tester, changing the heating mode of the lubricating oil system of the rotor tester; determining the characteristic coefficient Q S The correlation with the oil supply temperature is used to construct the characteristic coefficient according to the oil supply temperature and correlation of the preset time interval in each temperature gradient interval. Q S Coefficient library; calculate the characteristic coefficient of the current time interval Q S , according to the characteristic coefficient Q S Coefficient library and characteristic coefficients of the current time interval Q S Calculate the proportionality factor K ; Through the proportionality factor K Automatic correction of lubricating oil temperature control system PID Algorithmic PID parameters, and based on PID Parameters automatically control the lubricating oil temperature. This solution adaptively controls the lubricating oil temperature through the temperature control system, improving the heating efficiency and control accuracy of the lubricating oil temperature.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to a temperature control method, device, computer equipment and medium of a temperature control system. Background Art

[0002] The basic function of the lubricating oil system is to provide lubricating and cooling oil for the rotating high-temperature parts of the engine. It is responsible for transferring the heat generated by friction and the heat transferred from the high-temperature parts to the lubricating oil, and taking away the metal chips and debris generated by the wear of the parts. Therefore, the lubricating oil temperature of the aircraft engine is an important performance indicator for the lubrication system, and the level of lubricating oil temperature directly affects the test results. The lubricating oil temperature control system has the characteristics of time-varying, time-delay, and nonlinearity, and the existing control technology is not ideal.

[0003] Flexible rotor high-speed dynamic balancing tester is used for bearing performance test of a key model of aircraft engine, mainly for bearing DN value test, durability test, overspeed test, large load test and oil cut-off test, etc. At present, the lubricating oil temperature control system of the test bench is controlled by a temperature controller, and the temperature target value is transmitted to the programmable logic controller through the host computer. The programmable logic controller realizes data transmission with the temperature controller through the RS485 communication protocol, thereby completing temperature control and data collection. The existing lubricating oil temperature control schematic diagram is as follows Figure 2 shown.

[0004] However, this control mode and temperature control method have a series of problems, which are difficult to meet the test requirements and affect the test efficiency. The main problems are summarized as follows:

[0005] (1) Adopting classic PID The temperature control method is difficult to meet the test requirements.

[0006] The oil temperature control system of the flexible rotor high-speed dynamic balancing tester has the characteristics of time lag, nonlinearity and difficulty in online real-time control. PID The control algorithm cannot recognize changes in the system model, has a long setting time, is prone to overshoot, and has poor accuracy, making it difficult to meet the test temperature gradient control requirements. Failure to meet the temperature control standard will directly lead to invalidation of the relevant test data, and the test will have to be restarted, increasing scientific research costs and seriously affecting test efficiency.

[0007] (2) The communication between the programmable logic controller and the temperature controller is very unstable.

[0008] During the test, a series of problems often occur, such as the host computer failing to transmit the target value to the temperature controller, and the temperature values ​​collected by the temperature controller showing false values. These problems are generally caused by communication interference, which causes great trouble to temperature control, data collection, data analysis and processing, and the system has poor robustness.

[0009] (3) Simplify the control objectives.

[0010] The control method using a temperature controller can only use a certain system parameter as the control target, and cannot achieve adaptive replacement of the control target as the control logic changes, which greatly limits the design of the control logic.

[0011] (4) Lack of safe and reliable protection measures.

[0012] The test equipment's oil lubrication system control lacks safety protection functions, which poses certain safety hazards to the test equipment. Especially during the test, the heater, oil supply (return) pump and other equipment are working in a high-temperature environment. Once a fault occurs, the oil in the test piece's lubricating oil chamber is cut off and the heater is dry-burned, which will lead to major safety accidents such as dry grinding and damage to the test piece. Summary of the invention

[0013] In view of this, an embodiment of the present invention provides a temperature control method for a temperature control system to solve the technical problems of poor lubricating oil temperature control accuracy and low lubricating oil temperature control experimental efficiency in the prior art. The method includes:

[0014] Connecting the lubricating oil temperature control system to the oil supply and return lines of the lubricating oil system of the rotor tester, and using the lubricating oil temperature control system to change the heating mode of the lubricating oil system of the rotor tester, wherein the heating mode includes a test cycle heating mode and a self-cycle heating mode;

[0015] When the heating mode is the test cycle heating mode, determine the characteristic coefficient Q S The correlation with the fuel supply temperature is used to obtain multiple temperature gradient intervals of the historical fuel supply temperature, and the characteristic coefficient is constructed according to the fuel supply temperature and correlation of the preset time interval in each temperature gradient interval. Q S Coefficient library, where the characteristic coefficients Q S Characteristic coefficients that characterize the temperature change of the tester controlled by the oil temperature control system during the acceleration of the engine rotor within a preset time period;

[0016] Collect the oil supply temperature of the current time interval of the preset time length, and use the correlation relationship and the oil supply temperature of the current time interval to calculate the characteristic coefficient of the current time interval Q S , according to the characteristic coefficient Q S Coefficient library and characteristic coefficients of the current time interval Q S Calculate the proportionality factor K ;

[0017] By scaling factor K Automatic correction of lubricating oil temperature control system PID Algorithmic PID parameters, and based on PID The parameters automatically control the heating equipment in the lubricating oil temperature control system to automatically adjust the lubricating oil temperature.

[0018] The embodiment of the present invention also provides a temperature control device for a temperature control system to solve the technical problems of poor lubricating oil temperature control accuracy and low lubricating oil temperature control experimental efficiency in the prior art. The device includes:

[0019] A control system building module is used to connect the lubricating oil temperature control system with the oil supply and return lines of the lubricating oil system of the rotor tester, and use the lubricating oil temperature control system to change the heating mode of the lubricating oil system of the rotor tester, wherein the heating mode includes a test cycle heating mode and a self-cycle heating mode;

[0020] Construct a coefficient library module to determine the characteristic coefficients when the heating mode is the test cycle heating mode Q S The correlation with the fuel supply temperature is used to obtain multiple temperature gradient intervals of the historical fuel supply temperature, and the characteristic coefficient is constructed according to the fuel supply temperature and correlation of the preset time interval in each temperature gradient interval. Q S Coefficient library, where the characteristic coefficients Q S Characteristic coefficients that characterize the temperature change of the tester controlled by the oil temperature control system during the acceleration of the engine rotor within a preset time period;

[0021] The proportional coefficient calculation module is used to collect the oil supply temperature of the current time interval of the preset time length, and calculate the characteristic coefficient of the current time interval by using the correlation relationship and the oil supply temperature of the current time interval Q S , according to the characteristic coefficient Q S Coefficient library and characteristic coefficients of the current time interval Q S Calculate the proportionality factor K ;

[0022] Oil temperature control module, used to control the oil temperature by proportional coefficient K Automatic correction of lubricating oil temperature control system PID Algorithmic PID parameters, and based on PID The parameters automatically control the heating equipment in the lubricating oil temperature control system to automatically adjust the lubricating oil temperature.

[0023] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the temperature control method of any of the above-mentioned temperature control systems is implemented to solve the technical problems in the prior art of poor lubricating oil temperature control accuracy and low efficiency of lubricating oil temperature control experiments.

[0024] An embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program for executing the temperature control method of any of the above-mentioned temperature control systems to solve the technical problems in the prior art of poor lubricating oil temperature control accuracy and low lubricating oil temperature control experiment efficiency.

[0025] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0026] The hardware optimization design and software algorithm improvement are proposed. In terms of hardware, the solid-state relay is directly controlled by the programmable logic controller, which omits the temperature controller and communication links, thereby improving stability. Q S To characterize system changes, fuzzy algorithms and proportional coefficients K High-precision, zero-overshoot adaptive control of lubricating oil temperature is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a flow chart of a temperature control method of a temperature control system provided by an embodiment of the present invention;

[0029] Figure 2 It is a structural diagram of an existing lubricating oil temperature control system;

[0030] Figure 3 is a structural diagram of a lubricating oil temperature control system according to an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of two disturbance-free switching heating modes of the lubricating oil temperature control system according to an embodiment of the present invention;

[0032] Figure 5 The embodiment of the present invention PID Parameter self-adjustment principle diagram;

[0033] Figure 6This is a diagram showing the effect of using the temperature control system of an embodiment of the present invention to control the lubricating oil temperature;

[0034] Figure 7 is a comparison diagram of the effects of using the temperature control system of the embodiment of the present invention and using the existing lubricating oil temperature control system;

[0035] Figure 8 is a safety protection schematic diagram of a temperature control system provided by an embodiment of the present invention;

[0036] Fig. 9 is a structural block diagram of a computer device provided by an embodiment of the present invention;

[0037] Fig.10 It is a structural block diagram of a safety protection device for a temperature control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0039] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0040] In an embodiment of the present invention, a temperature control method of a temperature control system is provided, such as Figure 1 As shown, the method includes:

[0041] S101: connecting the lubricating oil temperature control system to the oil supply and return lines of the lubricating oil system of the rotor tester, and using the lubricating oil temperature control system to change a heating mode of the lubricating oil system of the rotor tester, wherein the heating mode includes a test cycle heating mode and a self-cycle heating mode;

[0042] S102: When the heating mode is the test cycle heating mode, determine the characteristic coefficient Q S The correlation with the fuel supply temperature is used to obtain multiple temperature gradient intervals of the historical fuel supply temperature, and the characteristic coefficient is constructed according to the fuel supply temperature and correlation of the preset time interval in each temperature gradient interval. Q SCoefficient library, where the characteristic coefficients Q S Characteristic coefficients that characterize the temperature change of the tester controlled by the oil temperature control system during the acceleration of the engine rotor within a preset time period;

[0043] S103: Collect the oil supply temperature of the current time interval of the preset time length, and calculate the characteristic coefficient of the current time interval by using the correlation relationship and the oil supply temperature of the current time interval Q S , according to the characteristic coefficient Q S Coefficient library and characteristic coefficients of the current time interval Q S Calculate the proportionality factor K ;

[0044] S104: By proportionality factor K Automatic correction of lubricating oil temperature control system PID Algorithmic PID parameters, and based on PID The parameters automatically control the heating equipment in the lubricating oil temperature control system to automatically adjust the lubricating oil temperature.

[0045] In specific implementation, the following steps are performed to connect the lubricating oil temperature control system with the oil supply line of the rotor tester lubricating oil system:

[0046] The lubricating oil temperature control system includes a host computer, a programmable logic controller, a relay and a heater; the host computer is connected to the programmable logic controller, the programmable logic controller is connected to the relay, and the relay is connected to the heater, wherein the programmable logic controller is connected to the relay through PID Algorithmic PID The parameters control the energization or de-energization of the coil of the relay, and the relay controls the switch of the heater through the pulse signal output by the digital quantity module of the programmable logic controller; the heater is set in the lubricating oil tank of the lubricating oil system of the rotor tester.

[0047] Specifically, Figure 3 As shown, the lubricating oil temperature control system includes a host computer, a programmable logic controller (PLC), a relay (solid-state relay) and a heater. Compared with the existing control system, this design has two improvements. First, from the perspective of system stability, the lubricating oil temperature control system of the embodiment of the present invention omits the temperature controller and RS485 communication protocol, solves the interference problem of the original system, and enhances the robustness of the system; second, from the perspective of economic benefits, the temperature controller and RS485 communication module (PLC and temperature controller communication module) are omitted, which reduces the scientific research cost for the system.

[0048] Specifically, the heating of the lubricating oil temperature control system adopts the switching mode of self-circulation heating and test circulation heating. Before the test, the software logic automatically switches the system heating mode to the self-circulation heating mode. Figure 4 The path shown is heated. At this time, the desired value of the control is the lubricating oil tank temperature. The purpose is to quickly heat the lubricating oil temperature in the tank to the desired value required for the test, thereby reducing the temperature heating time. When the difference between the tank temperature and the temperature required for the test is less than the intervention temperature, the current self-circulating heating mode is automatically switched to the test circulation heating switching mode. The lubricating oil temperature control system is based on Figure 4 The path shown is cyclic heating, and the desired value of the control becomes the test oil supply temperature. Different from the self-circulating heating mode, the test cyclic heating switching mode is that the lubricating oil flowing out of the oil tank enters the heating branch all the way and the cooling branch all the way. The design purpose of this pipeline is to reduce the thermal inertia of the system and accelerate the system to reach thermal equilibrium.

[0049] In specific implementation, the following steps are used to construct the characteristic coefficient according to the oil supply temperature and the correlation relationship of the preset time interval in each temperature gradient interval: Q S Coefficient library:

[0050] Determine the association relationship as: ,in, T 1 for t The oil supply temperature at the moment, T 2 for t+ Δ t The oil supply temperature at the time, Δt is the preset duration; according to the oil supply temperature at the end point of the time interval in each temperature gradient interval, multiple characteristic coefficients are calculated using the correlation relationship. Q S Characteristic coefficients formed Q S Array; Characteristic coefficient Q S The array is linearized to generate linearized characteristic coefficients Q S Correlation curve; the characteristic coefficient Q S Correlation curve as characteristic coefficient Q S The coefficient library is saved to the storage unit.

[0051] Specifically, the key to achieving adaptive control of lubricating oil temperature lies in automatically obtaining a temperature characteristic coefficient that characterizes the entire test process. Q S Through research, it is found that the main factors that affect the changes in the system model are changes in the external environment, the increase in return oil temperature caused by frictional heat generated by high-speed rotation of the bearing during the test, and changes in the test lubricating oil flow rate.

[0052] From the perspective of the entire system, the lubricating oil temperature control system model is as follows:

[0053] The theoretical heating amount of the heater in time T Q 1 is:

[0054] (1);

[0055] in, P is the power of the heater.

[0056] The friction heat generated by the rotation of the bearing and the friction heat of the sealing device in the bearing cavity are the main heat sources, which will increase the temperature of the lubricating oil. Q 2 is expressed as:

[0057] (2);

[0058] (3);

[0059] Where ω is the angular velocity, N is the ring speed, M L is the friction torque caused by the load, M V is the viscous friction torque, M S is the bearing rotation friction torque, M E is the end surface friction torque.

[0060] The heat loss due to heat exchange with the external environment is Q 3. Since the oil return cooler has a fixed flow rate and volume, the heat removed per unit time is also a fixed value. Q 4. Then in time T Actual heat gained by the lubricating oil Q 5 is:

[0061] (4);

[0062] Substituting equation (1), equation (2) and equation (3) into equation (4), we get:

[0063] (5);

[0064] The temperature changes are:

[0065] (6);

[0066] in, C is the specific heat capacity of the lubricating oil, ρ is the oil density, V For lubricating oilT The volume that flows in time.

[0067] Substituting equation (5) into equation (6), the system model can be obtained as follows:

[0068] (7);

[0069] It can be seen from formula (7) that if we want to accurately obtain the system model, we must accurately know some system coefficients (load friction torque, viscous friction torque, etc.), but these parameters cannot be accurately obtained in actual engineering applications. Moreover, this model is not universal, because the load friction torque, viscous friction torque and other coefficients of different test pieces are different, which means that the model coefficients need to be changed every time the test piece is changed; at the same time, this model has a large amount of calculation in the algorithm and a long response time, which is difficult to meet the test requirements of this rotor tester.

[0070] From the above algorithm, we can know that the changes in the external environment, the increase in the return oil temperature caused by the friction heat generated by the high-speed rotation of the bearing during the test, and the changes in the test lubricating oil flow rate will directly cause the oil supply temperature to change. Therefore, from the perspective of the control target (oil supply temperature), the characteristic coefficients that characterize the system model are studied. Q S as follows:

[0071] (8);

[0072] in, T 1 for t The oil supply temperature at the moment, T 2 for t+ Δ t The oil supply temperature at the moment.

[0073] It can be seen from formula (8) that by calculating the unit time Δ t The change of internal oil supply temperature can characterize the change of system model in the whole test process. This algorithm is simple, easy to implement and universal.

[0074] By comparison, it can be seen that the characteristic coefficient Q S It is an important characteristic parameter that indicates system changes. From formula (8), we can know that Δ t It cannot be zero, that is, it is not easy to adjust the characteristic coefficient during the temperature steady state adjustment. Q S Therefore Q S The calculation should avoid the temperature steady-state adjustment window to ensure the characteristic coefficient Q S Accuracy of calculations.

[0075] In specific implementation, the following steps are performed to achieve the characteristic coefficient Q S Coefficient library and characteristic coefficients of the current time interval Q S Calculate the proportionality factor K :

[0076] According to the oil supply temperature of the current time interval, query the characteristic coefficient Q S The coefficient library obtains the characteristic coefficients Q S ; Proportional coefficient K= The characteristic coefficient of the current time interval Q S / Query the characteristic coefficient Q S .

[0077] In specific implementation, the following steps are used to achieve the proportional coefficient K Automatic correction PID parameters, and PID Parameters input to PID Regulator to automatically adjust oil temperature:

[0078] The oil temperature control system PID Algorithmic PID Parameter multiplied by the scale factor K , generating the adjusted PID Parameters, and the adjusted PID Parameter output to PID Regulator; Use PID In the process of the regulator controlling the lubricating oil temperature, the fuzzy algorithm is used to PID Fine tune the parameters.

[0079] Specifically, in the initial stage of the system, the initial temperature control system is determined through repeated experiments. PID Parameters. Initially, the integral coefficient I and the differential coefficient D Set to 0 and gradually increase the scale parameter P When the system oscillates, slightly reduce the proportional parameter P When the system reaches a stable state, record the proportional parameters at this time P In the scale parameter P On the basis of I Until the steady-state error meets the system requirements, record the integral coefficient at this time I In the scale parameter P and the integral coefficient I On the basis of D, so that the dynamic characteristics and disturbance frequency of the system meet the requirements of the temperature control system.

[0080] like Figure 5 As shown, the temperature characteristics are established Q S The coefficient library is divided into sections according to the ramp control characteristics and the characteristic coefficients at different temperatures in the section are calculated in accordance with formula (8) Q S (Starting from 60℃, 10℃ / section, a total of 15 test sections), and saved in the corresponding storage unit to ensure steady-state temperature adjustment control in this temperature section.

[0081] First, determine the target temperature characteristic coefficient of the current control by calculation, and then query the temperature characteristic through the database query program Q S Coefficient library, call out the characteristic coefficients of the corresponding segment in the coefficient library Q S , determine the system change proportional coefficient through data comparison K , using the scaling factor K Automatic correction PID Parameters (proportional parameters P , integral coefficient I and the differential coefficient D ), and at the same time, the fuzzy algorithm is used to PID Fine tune the parameters.

[0082] Fuzzy algorithm real-time PID The parameters are fine-tuned to output the expected value error e and error change ec as the input of the controller. The correction value is obtained after fuzzification, approximate reasoning and clarification using the fuzzy control rules edited based on actual experience. ΔK p , ΔK i and ΔK d , thus meeting the requirements of fine-tuning the PID initial parameters at different times.

[0083] For a certain type of engine rotor performance test, the oil lubrication system test conditions, measured temperature and temperature adjustment time are shown in Table 1. The temperature control effect is compared with the theoretical effect diagram. Figure 6 shown.

[0084] Table 1

[0085]

[0086] Depend on Figure 6It can be seen that the actual control effect of the temperature control method of the embodiment of the present invention meets the temperature control requirements of the test bench model test, the control target has no overshoot, the control time and control accuracy both meet the test requirements, and the correct acquisition of the lubricating oil temperature control system model is realized, thereby achieving adaptive control of the lubricating oil temperature.

[0087] Taking 80°C as the target temperature, the lubricating oil temperature control method of the present application and the existing lubricating oil temperature control method are respectively adopted, and the control effect is as follows: Figure 7 The performance index comparison is shown in Table 2.

[0088] Table 2

[0089]

[0090] pass Figure 7 The comparison results with Table 2 show that for the problem that the lubricating oil temperature control system of the aircraft engine flexible rotor tester is difficult to control online in real time, the temperature control method of the embodiment of the present invention has good followability, high precision, zero overshoot, and the adjustment time meets the test requirements, has strong anti-interference ability, strong robustness, and can PID The parameters are adjusted online in real time without any human intervention in the whole process, which enables rapid identification of the model of the flexible rotor test bench and achieves the effect of intelligent and safe control of the lubricating oil temperature control system.

[0091] In specific implementation, the following steps are used to achieve safety protection of the test equipment of the temperature control system:

[0092] When the heating mode is the self-circulation heating mode, the inverter contactor is detected. D 1. First state, fuel pump contactor D 2nd state and oil return pump contactor D 3; controlling the heater contactor according to the first state, the second state and the third state D 4 is locked or released; when the heating mode is the test cycle heating mode, obtain the oil supply pump contactor D 2 Lubricating oil flow Q and oil return pump contactor D 3. Lubricating oil level L , when the oil flow Q and / or oil level L When the voltage is lower than the safety setting value, the inverter contactor is cut off. D 1. Oil supply pump contactor D 2. Oil return pump contactor D 3 and heater contactor D 4.

[0093] Specifically, in order to ensure the safety of test equipment and test pieces, prevent safety accidents, and avoid safety hazards brought by equipment and component failures to the entire test system, the safety control program design must be carried out before the entire control program design. The safety control program has the highest response level and can ensure the safety of the equipment during operation. The following two safety designs were carried out.

[0094] 1. Safety protection of temperature control system.

[0095] The lubricating oil temperature control system is mainly composed of frequency converter, oil supply (return) pump, heater and other equipment. The design is considered from two aspects: before the test and during the test. The PLC controller detects the frequency converter contactor D 1 (contactor of the frequency converter that controls the bearing, set in the bearing cavity), oil supply pump contactor D 2 (Oil supply pump contactor), oil return pump contactor D 3 (Oil return pump contactor), heater contactor D 4 (heater contactor) switch working state. Safety intelligent protection principle is as follows Figure 8 shown.

[0096] Before the test (in self-circulation heating mode), focus on monitoring the working status of the heater. S1 When the signal is 1, the safety protection program releases the heater contactor D 4, so that the heating control of the lubricating oil can be achieved. S1 When it is 0, the heater contactor D 4 will not be controlled by the upper computer. The purpose of such protection is to prevent the test personnel from operating incorrectly and heating the lubricating oil system before it enters the circulation state, causing dangerous accidents such as dry burning of the heater and burning of the lubricating oil in the heater.

[0097] During the test, the working status of the oil supply pump and the oil return pump is monitored. When either of the two is abnormal, the emergency stop procedure is immediately executed to cut off the inverter contactor. D 1. Oil supply pump contactor D 2. Oil return pump contactor D 3. Heater contactor D 4. The purpose is to prevent the test piece from being damaged by dry grinding due to equipment failure and other reasons.

[0098] Oil supply pump status monitoring: monitoring parameter is lubricating oil flow Q ,when Q When the flow rate is lower than the safety setting value, the signal S2 When it is 1, the emergency driving procedure is executed.

[0099] Oil return pump status monitoring: monitoring parameter is lubricating oil level L ,whenL When the liquid level is lower than the safety setting value, the signal S2 When it is 1, the emergency driving procedure is executed.

[0100] In specific implementation, the following steps are used to monitor the monitoring parameters during the test. When abnormal data occurs, an alarm signal can be generated and the test can be automatically terminated:

[0101] Determine the alarm value and shutdown value of the monitoring parameters according to the test requirements, where the monitoring parameters include lubricating oil supply pressure, lubricating oil flow, lubricating oil tank temperature and tank level; input the alarm value and shutdown value to the host computer, and detect the parameter value of the monitoring parameter in real time through the data security protection program in the host computer; when the parameter value is greater than the alarm value, the alarm information is displayed in the output device of the host computer; when the parameter value is lower than the shutdown value, the inverter contactor is cut off D 1 、 Fuel supply pump contactor D 2 、 Oil return pump contactor D 3 and heater contactor D 4, and reduce the rotation speed of the test piece to 0.

[0102] (2) Security protection when data is abnormal.

[0103] The parameters monitored during the test mainly include lubricating oil supply pressure, lubricating oil flow, lubricating oil tank temperature, tank liquid level, etc. During the design, data safety monitoring is divided into two levels: alarm and emergency stop.

[0104] According to the test requirements, the alarm value and shutdown value of the monitoring parameters are input through the host computer. After being sent to the bottom program, the data security protection program will monitor the parameter value in real time. When the parameter value is higher than the alarm value, the data displayed on the host computer will turn red, which serves as a reminder for the test personnel to refer to and make decisions. When the parameter value is lower than the shutdown value, the inverter contactor will be automatically cut off immediately. D 1. Oil supply pump contactor D 2. Oil return pump contactor D 3. Heater contactor D 4, and reduce the rotation speed of the test piece to 0 at the fastest rate.

[0105] In this embodiment, a computer device is provided, such as Fig. 9 The system includes a memory 901, a processor 902, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, any of the temperature control methods of the temperature control system described above is implemented.

[0106] Specifically, the computer device may be a computer terminal, a server or a similar computing device.

[0107] In this embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program for executing any of the temperature control methods of the temperature control system described above.

[0108] Specifically, computer-readable storage media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer-readable storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable storage media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0109] Based on the same inventive concept, a control device for a temperature control system is also provided in an embodiment of the present invention, as described in the following embodiments. Since the principle of solving the problem by the control device for the temperature control system is similar to that of the control method for the temperature control system, the implementation of the control device for the temperature control system can refer to the implementation of the control method for the temperature control system, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0110] Fig.10 is a structural block diagram of a control device of a temperature control system according to an embodiment of the present invention. Fig.10 As shown, it includes: a control system construction module 1001, a coefficient library construction module 1002, a proportional coefficient calculation module 1003 and a lubricating oil temperature control module 1004. The structure is described below.

[0111] The control system building module 1001 is used to connect the lubricating oil temperature control system with the oil supply and return lines of the lubricating oil system of the rotor tester, and use the lubricating oil temperature control system to change the heating mode of the lubricating oil system of the rotor tester, wherein the heating mode includes a test cycle heating mode and a self-cycle heating mode;

[0112] The coefficient library module 1002 is used to determine the characteristic coefficients when the heating mode is the test cycle heating mode.Q S The correlation with the fuel supply temperature is used to obtain multiple temperature gradient intervals of the historical fuel supply temperature, and the characteristic coefficient is constructed according to the fuel supply temperature and correlation of the preset time interval in each temperature gradient interval. Q S Coefficient library, where the characteristic coefficients Q S Characteristic coefficients that characterize the temperature change of the tester controlled by the oil temperature control system during the acceleration of the engine rotor within a preset time period;

[0113] The proportional coefficient calculation module 1003 is used to collect the oil supply temperature of the current time interval of the preset time length, and calculate the characteristic coefficient of the current time interval by using the correlation relationship and the oil supply temperature of the current time interval. Q S , according to the characteristic coefficient Q S Coefficient library and characteristic coefficients of the current time interval Q S Calculate the proportionality factor K ;

[0114] The lubricating oil temperature control module 1004 is used to control the oil temperature by a proportional coefficient K Automatic correction of lubricating oil temperature control system PID Algorithmic PID parameters, and based on PID The parameters automatically control the heating equipment in the lubricating oil temperature control system to automatically adjust the lubricating oil temperature.

[0115] In one embodiment, a control system building module includes:

[0116] System building unit for lubricating oil temperature control system including host computer, programmable logic controller, relay and heater;

[0117] The module connection unit is used to connect the host computer with the programmable logic controller, connect the programmable logic controller with the relay, and connect the relay with the heater, wherein the programmable logic controller is connected via PID Algorithmic PID The parameters control the energization or de-energization of the coil of the relay, and the relay controls the switch of the heater through the pulse signal output by the digital quantity module of the programmable logic controller;

[0118] The heater setting unit is used to set the heater in the lubricating oil tank of the lubricating oil system of the rotor tester.

[0119] In one embodiment, a coefficient library module is constructed, including:

[0120] Construct a calculation formula unit to determine the association relationship: ,in, T 1 for t The oil supply temperature at the moment, T 2 for t+ Δ t The fuel supply temperature at the moment, Δt is the preset duration;

[0121] The calculation formula construction unit is used to calculate multiple characteristic coefficients based on the oil supply temperature at the end point of the time interval in each temperature gradient interval using the correlation relationship. Q S Characteristic coefficients formed Q S Array;

[0122] Linearization unit for the characteristic coefficients Q S The array is linearized to generate linearized characteristic coefficients Q S Correlation curve;

[0123] Coefficient library storage unit, used to store characteristic coefficients Q S Correlation curve as characteristic coefficient Q S The coefficient library is saved to the storage unit.

[0124] In one embodiment, the proportionality coefficient calculation module includes:

[0125] A database characteristic coefficient query unit is used to query the characteristic coefficient according to the oil supply temperature of the current time interval. Q S The coefficient library obtains the characteristic coefficients Q S ;

[0126] Characteristic coefficient calculation unit for proportionality coefficient K= The characteristic coefficient of the current time interval Q S / Query the characteristic coefficient Q S .

[0127] In one embodiment, the lubricating oil temperature control module includes:

[0128] Parameter setting unit, used in lubricating oil temperature control system PID Algorithmic PID Parameter multiplied by the scale factor K , generating the adjusted PID Parameters, and the adjusted PID Parameter output to PID Regulator;

[0129] Parameter fine-tuning unit for use PID In the process of adjusting the oil temperature by the regulator, the fuzzy algorithm is used to PID Fine tune the parameters.

[0130] In one embodiment, the above device further includes a security protection module.

[0131] In one embodiment, the security protection module includes:

[0132] The state acquisition unit is used to acquire the state of the inverter contactor when the heating mode is the self-circulation heating mode. D 1. First state, fuel pump contactor D 2nd state and oil return pump contactor D The third state of 3;

[0133] Pre-test protection unit for controlling the heater contactor according to the first state, the second state and the third state D 4 locking or releasing;

[0134] The protection module unit during the test is used to obtain the oil supply pump contactor when the heating mode is the test cycle heating mode. D 2 Lubricating oil flow Q and oil return pump contactor D 3. Lubricating oil level L , when the oil flow Q and / or oil level L When the voltage is lower than the safety setting value, the inverter contactor is cut off. D 1. Oil supply pump contactor D 2. Oil return pump contactor D 3 and heater contactor D 4.

[0135] In one embodiment, the above device further includes an abnormal alarm module.

[0136] In one embodiment, the abnormal alarm module includes:

[0137] A threshold setting unit, used to determine the alarm value and shutdown value of the monitoring parameters according to the test requirements, wherein the monitoring parameters include lubricating oil supply pressure, lubricating oil flow, lubricating oil tank temperature and oil tank level;

[0138] A parameter value acquisition unit, used for inputting the alarm value and the shutdown value into a host computer, and detecting the parameter value of the monitoring parameter in real time through a data security protection program in the host computer;

[0139] An alarm processing unit, used for displaying an alarm message in an output device of the host computer when the parameter value is greater than the alarm value;

[0140] A shutdown processing unit is used to cut off the inverter contactor when the parameter value is lower than the shutdown value. D 1 、 Fuel supply pump contactor D 2 、 Oil return pump contactor D 3 and heater contactor D 4, and reduce the rotation speed of the test piece to 0.

[0141] The embodiments of the present invention achieve the following technical effects:

[0142] Solved the existing PID The temperature control method is difficult to meet the test requirements. Hardware optimization design and software algorithm improvement are proposed. In terms of hardware, the solid-state relay is directly controlled by the programmable logic controller, and the temperature controller and communication links are omitted, which improves the stability. In order to solve the problem that the control model changes due to factors such as changes in the test environment and the increase in oil temperature caused by the friction of the test piece during the test, the temperature characteristic coefficient is obtained to characterize the system changes, and the fuzzy algorithm and proportional coefficient are used to calculate the temperature characteristic coefficient. K High-precision, zero-overshoot adaptive control of lubricating oil temperature is achieved; the perfect alarm display of multiple fault codes and multiple safety protection capabilities provide strong safety protection and information technology support for the test; the lubricating oil temperature control method of the embodiment of the present invention can be applied to the lubricating oil temperature control of medium-sized bearing testers and high-temperature and high-pressure performance fingertip seal testers. At present, the accumulated test hours are tens of thousands of hours. The system is stable and the control accuracy is high. Considerable comprehensive benefits have been achieved, the utilization rate of the test equipment has been improved, and the equipment maintenance cycle and maintenance cost have been greatly shortened. At the same time, the technical level of research on adaptive control systems has been improved, and it can also be promoted and applied to the lubricating oil temperature control of component test benches in gas turbines, ships and other industries, and has a wide range of application value.

[0143] Obviously, those skilled in the art should understand that the modules or steps of the above-mentioned embodiments of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the embodiments of the present invention are not limited to any specific combination of hardware and software.

[0144] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temperature control method for a temperature control system, characterized in that: include: Connecting the lubricating oil temperature control system to the oil supply and return lines of the lubricating oil system of the rotor tester, and using the lubricating oil temperature control system to change the heating mode of the lubricating oil system of the rotor tester, wherein the heating mode includes a test cycle heating mode and a self-cycle heating mode; When the heating mode is the test cycle heating mode, determine the characteristic coefficient Q S The correlation relationship between the fuel supply temperature and the fuel supply temperature is obtained to obtain multiple temperature gradient intervals of the historical fuel supply temperature, and the characteristic coefficient is constructed according to the fuel supply temperature of the preset time interval in each temperature gradient interval and the correlation relationship. Q S Coefficient library, where the characteristic coefficients Q S A characteristic coefficient representing the temperature change of the tester controlled by the lubricating oil temperature control system during the acceleration of the rotor of the engine within the preset time period; The association relationship is determined as: ,in, T 1 for t The oil supply temperature at the moment, T 2 for t+ Δ t The fuel supply temperature at the moment, Δt is the preset duration; According to the end point oil supply temperature of each temperature gradient interval, multiple characteristic coefficients are calculated by using the above correlation relationship. Q S Characteristic coefficients formed Q S Array; The characteristic coefficient Q S The array is linearized to generate linearized characteristic coefficients Q S Correlation curve; The characteristic coefficient Q S Correlation curve as characteristic coefficient Q S The coefficient library is saved in the storage unit; Collect the oil supply temperature of the current time interval of the preset time length, and calculate the characteristic coefficient of the current time interval using the correlation relationship and the oil supply temperature of the current time interval Q S , according to the characteristic coefficient Q S The coefficient library and the characteristic coefficients of the current time interval Q S Calculate the proportionality factor K ; By the proportionality factor K Automatic correction of the oil temperature control system PID Algorithmic PID parameters, and based on the PID The parameters automatically control the heating device in the lubricating oil temperature control system to automatically adjust the lubricating oil temperature.

2. The temperature control method of the temperature control system according to claim 1, characterized in that: Connect the lubricating oil temperature control system with the supply and return oil lines of the rotor tester lubricating oil system, including: The lubricating oil temperature control system includes a host computer, a programmable logic controller, a relay and a heater; The host computer is connected to the programmable logic controller, the programmable logic controller is connected to the relay, and the relay is connected to the heater, wherein the programmable logic controller is connected to the relay. PID The algorithm PID The parameters control the energization or de-energization of the coil of the relay, and the relay controls the switch of the heater through the pulse signal output by the digital quantity module of the programmable logic controller; The heater is disposed in the lubricating oil tank of the lubricating oil system of the rotor tester.

3. The temperature control method of a temperature control system according to any one of claims 1 to 2, characterized in that: According to the characteristic coefficient Q S The coefficient library and the characteristic coefficient of the current time interval Q S Calculate the proportionality factor K ,include: According to the oil supply temperature of the current time interval, query the characteristic coefficient Q S The coefficient library obtains the characteristic coefficients Q S ; Proportional coefficient K= The characteristic coefficient of the current time interval Q S / Query the characteristic coefficient Q S .

4. The temperature control method of a temperature control system according to any one of claims 1 to 2, characterized in that: By the proportionality factor K Automatic correction PID parameters, and the PID Parameters input to PID Regulator to automatically adjust oil temperature, including: The oil temperature control system PID Algorithmic PID The parameter is multiplied by the scaling factor K , generating the adjusted PID Parameters, and the adjusted PID Parameters are output to the PID Regulator; Use the PID In the process of the regulator controlling the lubricating oil temperature, the fuzzy algorithm is used to PID Fine tune the parameters.

5. The temperature control method of a temperature control system according to any one of claims 1 to 2, characterized in that: Also includes: When the heating mode is the self-circulation heating mode, the inverter contactor is detected. D 1. First state, fuel pump contactor D 2nd state and oil return pump contactor D The third state of 3; Controlling a heater contactor according to the first state, the second state, and the third state D 4 locking or releasing; When the heating mode is the test cycle heating mode, obtain the oil supply pump contactor D 2 Lubricating oil flow Q and the oil return pump contactor D 3. Lubricating oil level L , when the lubricating oil flow Q and / or the lubricating oil level L When the voltage is lower than the safety setting value, the inverter contactor is cut off. D 1. The oil supply pump contactor D 2. The oil return pump contactor D 3 and the heater contactor D 4.

6. The temperature control method of a temperature control system according to any one of claims 1 to 2, characterized in that: Also includes: Determine the alarm value and shutdown value of the monitoring parameters according to the test requirements, wherein the monitoring parameters include lubricating oil supply pressure, lubricating oil flow, lubricating oil tank temperature and oil tank liquid level; Input the alarm value and the shutdown value into a host computer, and detect the parameter value of the monitoring parameter in real time through a data security protection program in the host computer; When the parameter value is greater than the alarm value, an alarm message is displayed in the output device of the host computer; When the parameter value is lower than the shutdown value, the inverter contactor is cut off. D 1 、 Fuel supply pump contactor D 2 、 Oil return pump contactor D 3 and heater contactor D 4, and reduce the rotation speed of the test piece to 0.

7. A control device for a temperature control system, characterized in that: include: A control system building module, used to connect the lubricating oil temperature control system with the oil supply and return lines of the lubricating oil system of the rotor tester, and use the lubricating oil temperature control system to change the heating mode of the lubricating oil system of the rotor tester, wherein the heating mode includes a test cycle heating mode and a self-cycle heating mode; Construct a coefficient library module for determining the characteristic coefficient when the heating mode is a test cycle heating mode Q S The correlation relationship between the fuel supply temperature and the fuel supply temperature is obtained to obtain multiple temperature gradient intervals of the historical fuel supply temperature, and the characteristic coefficient is constructed according to the fuel supply temperature of the preset time interval in each temperature gradient interval and the correlation relationship. Q S Coefficient library, where the characteristic coefficients Q S A characteristic coefficient representing the temperature change of the tester controlled by the lubricating oil temperature control system during the acceleration of the rotor of the engine within the preset time period; The coefficient library module includes: Construct a calculation formula unit to determine the association relationship: ,in, T 1 for t The oil supply temperature at the moment, T 2 for t+ Δ t The fuel supply temperature at the moment, Δt is the preset duration; The calculation formula construction unit is used to calculate multiple characteristic coefficients based on the oil supply temperature at the end point of the time interval in each temperature gradient interval using the correlation relationship. Q S Characteristic coefficients formed Q S Array; Linearization unit for the characteristic coefficients Q S The array is linearized to generate linearized characteristic coefficients Q S Correlation curve; Coefficient library storage unit, used to store characteristic coefficients Q S Correlation curve as characteristic coefficient Q S The coefficient library is saved in the storage unit; A proportional coefficient calculation module is used to collect the oil supply temperature of the current time interval of the preset time length, and calculate the characteristic coefficient of the current time interval using the association relationship and the oil supply temperature of the current time interval Q S , according to the characteristic coefficient Q S The coefficient library and the characteristic coefficients of the current time interval Q S Calculate the proportionality factor K ; The lubricating oil temperature control module is used to control the oil temperature by the proportional coefficient K Automatic correction of the oil temperature control system PID Algorithmic PID parameters, and based on the PID The parameters automatically control the heating device in the lubricating oil temperature control system to automatically adjust the lubricating oil temperature.

8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the temperature control method of the temperature control system according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program for executing the temperature control method of the temperature control system according to any one of claims 1 to 6.

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