Marine main engine cooling water temperature control simulation method and system

Abstract

The invention provides a marine main engine cooling water temperature control simulation method and system, and the method comprises the steps: obtaining the environment temperature data of a marine main engine cooling water temperature control simulation device through a temperature sensor, taking the environment temperature data as the temperature simulation data of cooling water, or obtaining the current flowing through a potentiometer, and taking the current as the temperature simulation data of the cooling water; calculating a first simulation temperature of the cooling water according to the current flowing through the potentiometer, and taking the first simulation temperature as temperature simulation data of the cooling water; according to the temperature simulation data of the cooling water and the first preset temperature, the opening degree of the electric proportional valve is calculated; controlling the electric proportional valve to act according to the opening degree of the electric proportional valve, and simulating the process of enabling the temperature of the cooling water to reach a first preset temperature; the teaching effect is greatly improved, students can see the adjusting process and the cooling principle of the cooling water of the main engine, and the efficiency and the quality of teaching and training the temperature of the cooling water of the ship main engine are improved to a great extent.

Description

Technical Field

[0001] The present invention relates to the technical field of ship main engine cooling water temperature control simulation technology, and in particular to a ship main engine cooling water temperature control simulation method and system. Background Art

[0002] The diesel engine cooling water temperature is one of the important state parameters of the ship. If the water temperature is too high, it will affect the heat dissipation effect of the diesel engine, resulting in an increase in the heat load of the diesel engine parts and a decrease in the strength of the parts. At the same time, it will increase the temperature of the lubricating oil, reduce the viscosity, deteriorate, deteriorate the lubrication effect, and increase the wear of the moving parts. Long-term operation at a temperature exceeding the allowable temperature will also cause the aging of the seals to cause cylinder liner leakage, and even serious accidents such as cylinder pulling and bearing burning. However, if the cylinder liner cooling water temperature is too low, the lubricating oil temperature will drop, the viscosity will increase, and the fluidity will deteriorate, which will not only increase the wear of the parts, but also increase the mechanical power loss due to the increase in the movement resistance of the parts, and the output power of the main engine will decrease. If the water temperature is too low, the cylinder temperature will be very low, and the water vapor generated by the combustion in the cylinder will easily condense. When the sulfur dioxide generated by the combustion of the main engine meets the condensed water, it will form a strong acid corrosive agent that adheres to the cylinder wall, and the surface of the cylinder wall will be severely corroded, which is the so-called cold corrosion phenomenon. Heat loss increases, fuel consumption increases When the main engine works at low temperature, the cooling water takes away a lot of heat energy from the cylinder liner, which increases its heat loss and low internal temperature. The oil mist mixture cannot be formed and burned well, and the fuel consumption will increase by 8% to 10%. The fuel condensed into droplets will wash the lubricating oil film on the cylinder wall after entering the cylinder, and penetrate into the crankcase through the stuffing box, increasing the wear of parts, diluting the lubricating oil in the oil pan, increasing fuel consumption and reducing power output. Combustion deteriorates, and the performance of the whole machine deteriorates. Some parts that expand due to heat do not expand to the proper size due to too low temperature, thus affecting the working performance of the whole machine. Therefore, the main engine cylinder liner cooling water system is an important guarantee to ensure the good working condition of the main engine. It is necessary to ensure that the cylinder liner cooling water temperature is within the set range and maintains stability, and give a warning when it exceeds the threshold, or force the main engine to slow down / stop.

[0003] Since the control of ship main engine cooling water is a very important teaching and training content in ship automation teaching, teachers can only let students recognize equipment components and orally describe the operation process. Students cannot see the adjustment process and cooling principle of the main engine cooling water, nor can they adjust the parameters according to the adjustment process. Therefore, they cannot experience the actual working process and fail to achieve the purpose of practical training. The existing ship cooling water automatic temperature control physical simulation operation system adopts pneumatic PID adjustment control, which requires sealing and compressed air supply operations and is easily affected by temperature and humidity changes and compressed air fluctuations. It has a slow response speed and low control accuracy, which increases the complexity and energy consumption of the system.

[0004] Therefore, the prior art needs to be further developed. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a method and system for simulating the temperature control of cooling water of a ship main engine to solve the problems existing in the prior art.

[0006] To achieve the above technical objectives, according to a first aspect of the present invention, the present invention provides a method for simulating the temperature control of cooling water of a ship main engine, comprising:

[0007] S100, using a temperature sensor disposed in the ship main engine cooling water temperature control simulation device to periodically obtain ambient temperature data of the ship main engine cooling water temperature control simulation device, and using the ambient temperature data as the cooling water temperature simulation data, or periodically obtaining the current flowing through the potentiometer, calculating the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and using the first simulation temperature as the cooling water temperature simulation data;

[0008] S200, obtaining a first preset temperature, and calculating the opening of the electric proportional valve according to the temperature simulation data of the cooling water and the first preset temperature;

[0009] S300, controlling the action of the electric proportional valve according to the calculated opening of the electric proportional valve, simulating a process of making the temperature of the cooling water reach the first preset temperature.

[0010] Specifically, the method includes:

[0011] A temperature simulation mode selection knob is set, and the temperature simulation mode selection knob is electrically connected to the potentiometer and the temperature sensor respectively, and is used to select ambient temperature data as the temperature simulation data of cooling water, or to select periodically obtain the current flowing through the potentiometer, calculate the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and use the first simulation temperature as the temperature simulation data of the cooling water.

[0012] Specifically, the step of calculating the first simulated temperature of the cooling water according to the current flowing through the potentiometer includes:

[0013] The first simulated temperature of the cooling water is calculated according to the current flowing through the potentiometer and the first preset proportionality coefficient, and the first simulated temperature of the cooling water is used as the temperature simulation data of the cooling water.

[0014] Specifically, the step of calculating the opening of the electric proportional valve according to the temperature simulation data of the cooling water and the first preset temperature includes:

[0015] A first preset temperature input by a user is obtained, and the opening of the electric proportional valve is calculated according to a difference between the first preset temperature input by the user and the temperature simulation data of the cooling water.

[0016] Specifically, the calculation of the opening of the electric proportional valve includes:

[0017] The driving current of the electric proportional valve is calculated and outputted by using the difference between the first preset temperature and the temperature simulation data of the cooling water and the second preset proportional coefficient, and then the opening of the electric proportional valve is calculated by the driving current of the electric proportional valve.

[0018] Specifically, the method further includes:

[0019] An ammeter and a display screen are arranged between the electric proportional valve and the electric PID control unit. The ammeter is used to detect the driving current, and the display screen is used to display the current cooling water temperature analog data.

[0020] Specifically, the method further includes:

[0021] A fuel mode indicator light is provided, the fuel mode indicator light comprising a low-sulfur oil indicator light and a heavy oil indicator light, the fuel mode indicator light is control-connected to a fuel mode switching knob, the fuel mode indicator light and the fuel mode switching knob are both electrically connected to a control chip of an electric PID control unit, when the fuel mode is switched to a low-sulfur oil mode by the fuel mode switching knob, the low-sulfur oil indicator light is lit, and the heavy oil indicator light is off; when the fuel mode is switched to a heavy oil mode by the fuel mode switching knob, the low-sulfur oil indicator light is off, and the heavy oil indicator light is lit.

[0022] Specifically, the method further includes:

[0023] A temperature alarm indicator light is provided, and whether to turn on the temperature alarm indicator light is determined according to the current cooling water temperature simulation data. The temperature alarm indicator light is electrically connected to the control chip of the electric PID control unit.

[0024] Specifically, the temperature alarm indicator light includes a low-sulfur oil cooling water temperature alarm indicator light and a heavy oil cooling water temperature alarm indicator light. The low-sulfur oil cooling water temperature alarm indicator light is used to indicate that an alarm is triggered when the temperature simulation data of the cooling water reaches a set value in the low-sulfur oil mode, and the heavy oil cooling water temperature alarm indicator light is used to indicate that an alarm is triggered when the temperature simulation data of the cooling water reaches a set value in the heavy oil mode.

[0025] According to a second aspect of the present invention, the present invention provides a ship main engine cooling water temperature control simulation system:

[0026] An acquisition module: used to periodically acquire the ambient temperature data of the ship main engine cooling water temperature control simulation device using a temperature sensor arranged in the ship main engine cooling water temperature control simulation device, or to periodically acquire the current flowing through the potentiometer; or to acquire the first preset temperature;

[0027] Control module: used to use the ambient temperature data as the temperature simulation data of cooling water, or to use the first simulation temperature as the temperature simulation data of cooling water; or to calculate the opening of the electric proportional valve according to the temperature simulation data of cooling water and the first preset temperature; or to control the action of the electric proportional valve according to the calculated opening of the electric proportional valve, so as to simulate the process of making the temperature of cooling water reach the first preset temperature.

[0028] Beneficial effects:

[0029] The present invention uses a temperature sensor to obtain the ambient temperature data of the ship main engine cooling water temperature control simulation device, and uses the ambient temperature data as the cooling water temperature simulation data, or calculates the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and uses the first simulation temperature as the cooling water temperature simulation data; calculates the opening of the electric proportional valve according to the cooling water temperature simulation data and the first preset temperature; controls the action of the electric proportional valve according to the opening of the electric proportional valve to simulate the process of making the temperature of the cooling water reach the first preset temperature. The setting of the above scheme greatly improves the teaching effect, allowing students to see the adjustment process and cooling principle of the main engine cooling water. Different from traditional teaching in which teachers can only let students recognize equipment components and orally explain the operation process, this intuitive display helps students better understand the relevant knowledge of ship main engine cooling water temperature control, so that students can adjust the operation of various parameters according to the situation of the adjustment process and experience the actual working process. Therefore, the present invention greatly improves the efficiency and quality of ship main engine cooling water temperature teaching and training. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of a method for simulating the temperature control of cooling water of a ship main engine provided in a specific embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the system composition of the ship main engine cooling water temperature control simulation system provided in a specific embodiment of the present invention;

[0032] Figure 3 It is a partial structural schematic diagram of a ship main engine cooling water temperature control simulation system provided in a specific embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of each indicator light and its corresponding knob provided in a specific embodiment of the present invention;

[0034] Figure 5 It is a schematic diagram of the interface of the electric PID control unit provided in the specific implementation manner of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0036] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0037] See also Figure 1 , Figure 3 and Figure 4 This embodiment provides a method for simulating the temperature control of cooling water of a ship main engine, comprising:

[0038] S100, using a temperature sensor disposed in the ship main engine cooling water temperature control simulation device to periodically obtain ambient temperature data of the ship main engine cooling water temperature control simulation device, and using the ambient temperature data as the cooling water temperature simulation data, or periodically obtaining the current flowing through the potentiometer, calculating the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and using the first simulation temperature as the cooling water temperature simulation data;

[0039] It can be understood that the ship main engine cooling water temperature control simulation device includes an electric PID control unit, an electric proportional valve, a potentiometer, and a temperature sensor, wherein the electric PID control unit includes an input end and an output end; the potentiometer and the temperature sensor are electrically connected to the input end of the electric PID control unit respectively, and the output end of the electric PID is electrically connected to the electric proportional valve. By using the electric PID control unit to detect the feedback value of the main engine cooling water temperature, and adjusting the opening of the electric proportional valve, as well as inputting the ambient temperature through the temperature sensor, or inputting the current through the potentiometer, the cooling water temperature can be effectively simulated, which greatly improves the teaching effect and allows students to see the adjustment process and cooling principle of the main engine cooling water.

[0040] Specifically, the method includes:

[0041] A temperature simulation mode selection knob is set, and the temperature simulation mode selection knob is electrically connected to the potentiometer and the temperature sensor respectively, and is used to select ambient temperature data as the temperature simulation data of cooling water, or to select periodically obtain the current flowing through the potentiometer, calculate the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and use the first simulation temperature as the temperature simulation data of the cooling water.

[0042] See also Figure 3The electric PID control unit includes a control chip, and a temperature simulation mode selection knob is arranged on the electric PID control unit; the temperature simulation mode selection knob is electrically connected to the control chip, and the temperature simulation mode selection knob is respectively connected to the potentiometer and the temperature sensor control, and the temperature sensor uses a PT100 sensor, and the temperature of the PT100 sensor is the temperature of the environment in which the ship main engine cooling water temperature control simulation device is located. The potentiometer is used to realize the change of the current flowing through the potentiometer by manually adjusting the upper and lower resistance ratio of the resistor film, thereby simulating the change of the cooling water temperature. The above setting can enable students to observe the change of the simulated cooling water temperature more intuitively.

[0043] The process of adjusting and selecting the source of the cooling water simulation temperature by the temperature simulation mode selection knob includes: when the temperature sensor mode is selected, the cooling water temperature is simulated according to the current ambient temperature detected by the PT100 sensor; when the potentiometer mode is selected, the change of the cooling water temperature is simulated according to the change of the current flowing through the potentiometer output by the potentiometer.

[0044] Specifically, the step of calculating the first simulated temperature of the cooling water according to the current flowing through the potentiometer includes:

[0045] The first simulated temperature of the cooling water is calculated according to the current flowing through the potentiometer and the first preset proportionality coefficient, and the first simulated temperature of the cooling water is used as the temperature simulation data of the cooling water.

[0046] It should be further explained that when the potentiometer is rotated, the resistance value of the connected circuit will change, thereby changing the current flowing through the potentiometer. There is a certain linear relationship between the current flowing through the potentiometer and the temperature. The first preset proportionality coefficient k is to quantify this linear relationship.

[0047] For example, when a current I flows through the potentiometer, according to the determined relationship, the temperature T can be expressed as T=k×I, and the current value can be converted into the corresponding first simulation temperature, and the first simulation temperature is used as the temperature simulation data of the cooling water.

[0048] S200, obtaining a first preset temperature, and calculating the opening of the electric proportional valve according to the temperature simulation data of the cooling water and the first preset temperature;

[0049] Specifically, the step of calculating the opening of the electric proportional valve according to the temperature simulation data of the cooling water and the first preset temperature includes:

[0050] A first preset temperature input by a user is obtained, and the opening of the electric proportional valve is calculated according to a difference between the first preset temperature input by the user and the temperature simulation data of the cooling water.

[0051] Specifically, the calculation of the opening of the electric proportional valve includes:

[0052] The driving current of the electric proportional valve is calculated and outputted by using the difference between the first preset temperature and the temperature simulation data of the cooling water and the second preset proportional coefficient, and then the opening of the electric proportional valve is calculated by the driving current of the electric proportional valve.

[0053] It can be understood that the user sets a first preset temperature in the electric PID control unit. The first preset temperature here is used to simulate the situation that the temperature of the cooling water in the actual ship main engine should meet certain requirements. The opening of the electric proportional valve is determined according to the difference between the first preset temperature input by the user and the current cooling water temperature simulation data. This process is completed by the mathematical model in the electric PID control unit. The opening of the electric proportional valve is adjusted according to the rate of change of the temperature difference. The driving current of the electric proportional valve is calculated by using the product of the temperature difference and the second preset proportional coefficient, and then its opening is adjusted by adjusting the driving current of the electric proportional valve.

[0054] Specifically, the method further includes:

[0055] An ammeter and a display screen are arranged between the electric proportional valve and the electric PID control unit, wherein the ammeter is used to detect the driving current, and the display screen is used to display the current cooling water temperature analog data.

[0056] See also Figure 3 The ammeter includes a positive pole and a negative pole. The positive pole of the ammeter is electrically connected to the output end of the electric PID control unit, and the negative pole of the ammeter is electrically connected to the electric proportional valve to form a circuit loop. The ammeter can output a 4-20mA current signal, corresponding to the 0%-100% opening of the electric proportional valve. The electric PID control unit controls the action of the external electric proportional valve by outputting a 4-20mA current signal, which makes it easy for students to intuitively observe the adjustment process and cooling principle of the host cooling water. The display screen can directly display the current cooling water temperature simulation data. Students do not need to obtain temperature information through other complex detection equipment or calculation methods, making the temperature data clear at a glance.

[0057] Specifically, the method further includes:

[0058] A fuel mode indicator light is provided, the fuel mode indicator light comprising a low-sulfur oil indicator light and a heavy oil indicator light, the fuel mode indicator light is control-connected to a fuel mode switching knob, the fuel mode indicator light and the fuel mode switching knob are both electrically connected to a control chip of an electric PID control unit, when the fuel mode is switched to a low-sulfur oil mode by the fuel mode switching knob, the low-sulfur oil indicator light is lit, and the heavy oil indicator light is off; when the fuel mode is switched to a heavy oil mode by the fuel mode switching knob, the low-sulfur oil indicator light is off, and the heavy oil indicator light is lit.

[0059] See also Figure 3and Figure 4 The electric PID control unit includes a control chip, and the fuel mode switching knob is electrically connected to the control chip of the electric PID control unit. The fuel mode includes a low-sulfur oil mode and a heavy oil mode. By setting the fuel mode switching knob, the ship main engine cooling water temperature control system can adapt to different fuel modes. Through the fuel switching knob, the corresponding fuel mode controller can be selected to control, and the fuel mode indicator light is set, so that the trainees can intuitively see the fuel mode currently used by the ship main engine. When the fuel mode is switched, the corresponding fuel indicator light is on, clearly indicating the fuel mode in which the system is running. The fuel mode indicator light includes a low-sulfur oil indicator light and a heavy oil indicator light. The low-sulfur oil indicator light and the heavy oil indicator light are both electrically connected to the control chip of the electric PID control unit. This clear indicator light identification helps trainees quickly understand the fuel status and can accurately distinguish between low-sulfur oil and heavy oil. When low-sulfur oil is used, the low-sulfur oil indicator light is on. When the ship main engine switches between low-sulfur oil and heavy oil, the corresponding fuel mode indicator light will switch the lighting state in time according to the signal of the control chip, and the trainees can switch operations at the appropriate time according to the indicator light state.

[0060] Furthermore, regardless of whether the fuel mode is selected as the low-sulfur oil mode or the heavy oil mode, the first preset proportional coefficient used to calculate the first simulated temperature of the cooling water and the second preset proportional coefficient used for the driving current in the present invention can be fixedly set and will not change with changes in the fuel mode.

[0061] Specifically, the method further includes:

[0062] A temperature alarm indicator light is provided, and whether to turn on the temperature alarm indicator light is determined according to the current temperature simulation data of the cooling water. The temperature alarm indicator light is electrically connected to the control chip of the electric PID control unit.

[0063] Specifically, the temperature alarm indicator light includes a low-sulfur oil cooling water temperature alarm indicator light and a heavy oil cooling water temperature alarm indicator light. The low-sulfur oil cooling water temperature alarm indicator light is used to indicate that an alarm is triggered when the temperature simulation data of the cooling water reaches a set value in the low-sulfur oil mode, and the heavy oil cooling water temperature alarm indicator light is used to indicate that an alarm is triggered when the temperature simulation data of the cooling water reaches a set value in the heavy oil mode.

[0064] See also Figure 3 and Figure 4, the temperature alarm indicator light includes a low-sulfur oil cooling water temperature alarm indicator light and a heavy oil cooling water temperature alarm indicator light, and the low-sulfur oil cooling water temperature alarm indicator light and the heavy oil cooling water temperature alarm indicator light are both electrically connected to the control chip of the electric PID control unit. The low-sulfur oil cooling water temperature alarm indicator light includes a low-sulfur oil cooling water high temperature alarm indicator light and a low-sulfur oil cooling water low temperature alarm indicator light, and the heavy oil cooling water temperature alarm indicator light includes a heavy oil cooling water high temperature alarm indicator light and a heavy oil cooling water low temperature alarm indicator light. It can be understood that the low-sulfur oil cooling water temperature alarm indicator light and the heavy oil cooling water temperature alarm indicator light respectively include high temperature and low temperature alarm indicators and are both electrically connected to the control chip of the electric PID control unit, which enables the cooling water temperature under different fuel modes, i.e., low-sulfur oil and heavy oil, to be accurately monitored during the operation of the ship's main engine. Once the cooling water temperature exceeds the normal range, whether it is high temperature or low temperature, the corresponding alarm indicator light will light up, and the trainee will be promptly alerted. The high and low temperatures here can be set by the trainee in the electric PID control unit, which is used to intuitively simulate the temperature alarm situation in an actual ship.

[0065] Furthermore, due to the different combustion characteristics of low-sulfur oil and heavy oil, the impact on cooling water temperature is also different. Setting cooling water temperature alarm indicator lights for different fuels can monitor the temperature according to the specific requirements of each fuel. Trainees can set the temperature setting value according to the actual situation.

[0066] See also Figure 3 and Figure 4 The ship main engine cooling water temperature control simulation device also includes a power indicator light. A power switch is provided on the electric PID control unit. The power indicator light and the power switch are electrically connected to the control chip of the electric PID control unit. In this way, the power indicator light can intuitively display the power status of the ship main engine cooling water temperature control simulation device. When the power switch is turned on, if the power indicator light is on, the operator can immediately know that the device is powered on. Otherwise, it means that the power is not connected or there is a fault. This intuitive display method does not require the operator to use complex detection equipment or operations to judge the power supply situation. It is convenient and fast, and improves the ease of operation.

[0067] S300, controlling the action of the electric proportional valve according to the calculated opening of the electric proportional valve, simulating a process of making the temperature of the cooling water reach the first preset temperature.

[0068] The following describes the practical training guidance process of this embodiment:

[0069] This simulation device adopts an electric PID control unit and is equipped with an electric proportional valve with a control signal of 4-20mA and a voltage of AC220V. The temperature controller (electric PID control unit), electric actuator (electric proportional valve) and PT100 (temperature sensor) are all real objects.

[0070] A PT100 sensor is installed in the simulation device, and the system feedback temperature is the temperature of PT100. Since there is no actual heat source and cooling device outside, the temperature of PT100 is room temperature and cannot simulate the change of cooling water outlet temperature. Therefore, during the experiment, the potentiometer can be selected as the simulation signal source through the temperature simulation mode selection knob. The potentiometer and PT100 are both resistance signals. By changing the value of the potentiometer, the change of the host cooling water temperature can be simulated, which in turn affects the PID controller and the adjustment process of the PID can be observed.

[0071] The output signal of the PID controller (electric PID control unit) is 4-20mA, which controls the action of the external electric proportional valve and can be observed intuitively. The current signal output by the PID controller must form a loop to display the current value. If an external electric proportional valve is connected, a current loop has been formed. If not, the two 4-20mA output lines need to be connected together to form a current loop.

[0072] The specific training operation process is as follows:

[0073] All circuits of the simulation device including the external electric proportional valve have been connected, mainly to operate the PID controller (electric PID control unit), and the present invention only describes the main operations;

[0074] See also Figure 5 , Table 1 introduces the various parts of the PID controller interface;

[0075] Table 1 Introduction to each part of the P ID controller interface

[0076]

[0077]

[0078] 1. Input signal type setting: Target setting is PT100

[0079] (1) Press and hold the SET key + the Shift key for 5 seconds to enter LEVEL3;

[0080] (2) Press the Set key to switch to parameter I NP1;

[0081] (3) Press the shift key, the SV value starts to flash, then press the increase or decrease key to select the required type code according to the type code and range in Table 2, and finally press the SET key to confirm the change. Select code PT1, which represents PT100 -200~+600℃.

[0082] Table 2 Comparison table of measuring range and type code

[0083]

[0084] 2. Set the alarm mode and alarm value

[0085] Cooling water generally sets an absolute value alarm, that is, an alarm is triggered when the temperature exceeds or falls below a certain degree. A relative value alarm can also be set, that is, an alarm is triggered when the difference between the actual value and the set value exceeds the set value.

[0086] To set the alarm, you need to set the alarm mode and alarm threshold in conjunction with the two system variables. You can set the AL1 and AL2 alarms separately, as shown in Table 3. Taking the absolute value alarm as an example, when the temperature is set to > 90°C, AL1 triggers the alarm, and when the temperature is < 90°C, the alarm disappears.

[0087] (1) Press and hold the SET key + the Shift key for 5 seconds to enter LEVEL3;

[0088] (2) Press the SET key to switch to parameter ALD1 or ALD2;

[0089] (3) Press the shift key to select the alarm mode: 15;

[0090] (4) Press the SET key to switch to HYSA and set the alarm hysteresis to 0;

[0091] (5) Return to the main interface and press the SET button to find the AL1 alarm threshold setting interface. The code is AL1.

[0092] (6) Use the plus and minus keys to set the alarm threshold to 90;

[0093] (7) Adjust the potentiometer temperature and observe the setting effect;

[0094] (8) AL1 and AL2 outputs are associated with the panel's low cooling water temperature and high cooling water temperature alarm indicators. You can test and observe the indication of the alarm indicator when the alarm is activated. They are factory-matched and must be consistent with the actual indicator label function during testing;

[0095] Table 3 Alarm modes ALD1, ALD2 and their descriptions

[0096]

[0097] 3. Set PID parameters

[0098] (1) Press and hold the SET key for 5 seconds to enter the LEVEL2 P ID layer;

[0099] (2) Press the SET key to select P1, I 1, D1 respectively, as shown in Table 4;

[0100] (3) Use the up and down keys to modify the value of the corresponding parameter of the PID and observe the changes during the adjustment process.

[0101] Table 4 Parameter settings corresponding to P1, I1, and D1

[0102] P1 I1 D1 3.0 240 60

[0103] 4. Set the temperature setting value of the thermostat

[0104] Simply press the shift key on the main interface, SV starts to flash, then press the increase and decrease keys to set the required temperature value, and finally press the SET key to confirm. Be careful not to press the A / M key to confirm. Pressing the A / M key will also stop the SV value from flashing, but the set value is not actually stored. Later, the SV value will return to the value before setting.

[0105] 5. PID self-tuning function

[0106] Press the SET key for 5 seconds to enter LEVEL2 to view the factory-set PID, P1 = 3.0.11 = 240, D1 = 60. If you are familiar with PID control, you can set the PID value by yourself to achieve the ideal effect of current temperature control. If you are not very familiar with the characteristics of PID control, you can choose to let the instrument find the appropriate PID parameters (automatic calculation) by itself. In the main interface, press the SET key several times to go down to the AT menu, then press the shift key and the increase key K1, change the value to "YES" to perform automatic calculation, and the AT indicator light flashes. During the execution of automatic calculation, after the measured value PV fluctuates several times around the set value SV, the AT light goes out, and the PID parameters have been modified to a value suitable for the current control, and you can enter LEVEL2 for reference.

[0107] The self-tuning function requires an actual working environment. Since the simulation device is in a simulation environment, it is meaningless to perform self-tuning.

[0108] 6. Manual function output

[0109] (1) In the main interface, press and hold the A / M key for 3 seconds to switch between automatic output and manual output;

[0110] (2) In the manual output state, the MAN indicator light is on. Use the shift key and the increase key K1 and the decrease key K2 to set the value in the MV output percentage display window. The current output percentage can be adjusted without pressing the SET key to confirm.

[0111] The present invention adopts an electric control unit, namely an electric PID control unit. However, whether it is an electric control unit or a pneumatic control unit (such as NAKAKI TA), the opening of the temperature control valve is adjusted by a PI (PID) algorithm by detecting the feedback value of the main engine cylinder liner outlet temperature.

[0112] Electric temperature control units generally use PT100 type sensors as feedback sensors, and the internal microprocessor chip performs PID calculations and outputs to control the opening of the electric temperature control valve.

[0113] Pneumatic temperature control units generally use a metal probe connected to a metal temperature bag (a sealed metal can) inside it as a detection method. When the temperature changes, the pressure in the entire temperature bag will also change. This pressure change will cause the measuring spring tube to deform, and through a series of mechanical mechanism components, the relative position of the baffle and the nozzle will change, and ultimately the output (pressure) will change. The actuator is generally a pneumatic diaphragm proportional valve that receives a pressure signal of 0.2 to 1 bar.

[0114] It should be noted here that the present invention uses a temperature sensor to obtain the ambient temperature data of the ship main engine cooling water temperature control simulation device, and uses the ambient temperature data as the cooling water temperature simulation data, or calculates the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and uses the first simulation temperature as the cooling water temperature simulation data; calculates the opening of the electric proportional valve according to the cooling water temperature simulation data and the first preset temperature; controls the action of the electric proportional valve according to the opening of the electric proportional valve to simulate the process of making the cooling water temperature reach the first preset temperature. The setting of the above scheme greatly improves the teaching effect, allowing students to see the adjustment process and cooling principle of the main engine cooling water. Unlike traditional teaching in which teachers can only let students recognize equipment components and orally explain the operation process, this intuitive display helps students better understand the relevant knowledge of ship main engine cooling water temperature control, so that students can adjust the operation of various parameters according to the situation of the adjustment process, and can experience the actual working process. Therefore, the present invention greatly improves the efficiency and quality of ship main engine cooling water temperature teaching and training.

[0115] See also Figure 2 This embodiment provides a ship main engine cooling water temperature control simulation system, including:

[0116] The acquisition module 100 is used to periodically acquire the ambient temperature data of the ship main engine cooling water temperature control simulation device using a temperature sensor disposed in the ship main engine cooling water temperature control simulation device, or to periodically acquire the current flowing through the potentiometer; or to acquire the first preset temperature;

[0117] Control module 200: used to use the ambient temperature data as cooling water temperature simulation data, or to use the first simulation temperature as cooling water temperature simulation data; or to calculate the opening of the electric proportional valve according to the cooling water temperature simulation data and the first preset temperature; or to control the action of the electric proportional valve according to the calculated opening of the electric proportional valve, so as to simulate the process of making the cooling water temperature reach the first preset temperature.

[0118] It should be noted here that the present invention uses a temperature sensor to obtain the ambient temperature data of the ship main engine cooling water temperature control simulation device, and uses the ambient temperature data as the cooling water temperature simulation data, or calculates the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and uses the first simulation temperature as the cooling water temperature simulation data; calculates the opening of the electric proportional valve according to the cooling water temperature simulation data and the first preset temperature; controls the action of the electric proportional valve according to the opening of the electric proportional valve to simulate the process of making the cooling water temperature reach the first preset temperature. The setting of the above scheme greatly improves the teaching effect, allowing students to see the adjustment process and cooling principle of the main engine cooling water. Unlike traditional teaching in which teachers can only let students recognize equipment components and orally explain the operation process, this intuitive display helps students better understand the relevant knowledge of ship main engine cooling water temperature control, so that students can adjust the operation of various parameters according to the situation of the adjustment process, and can experience the actual working process. Therefore, the present invention greatly improves the efficiency and quality of ship main engine cooling water temperature teaching and training.

[0119] The various technical features described above can be combined arbitrarily. Although all possible combinations of these technical features are not described, any combination of these technical features should be considered to be covered by this specification as long as there is no contradiction in such combination.

[0120] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for simulating the temperature control of cooling water of a ship main engine, characterized in that: include: S100, using a temperature sensor disposed in the ship main engine cooling water temperature control simulation device to periodically obtain ambient temperature data of the ship main engine cooling water temperature control simulation device, and using the ambient temperature data as the cooling water temperature simulation data, or periodically obtaining the current flowing through the potentiometer, calculating the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and using the first simulation temperature as the cooling water temperature simulation data; S200, obtaining a first preset temperature, and calculating the opening of the electric proportional valve according to the temperature simulation data of the cooling water and the first preset temperature; S300, controlling the action of the electric proportional valve according to the calculated opening of the electric proportional valve, simulating a process of making the temperature of the cooling water reach the first preset temperature.

2. The ship main engine cooling water temperature control simulation method according to claim 1 is characterized in that: The method comprises: A temperature simulation mode selection knob is set, and the temperature simulation mode selection knob is electrically connected to the potentiometer and the temperature sensor respectively, and is used to select ambient temperature data as the temperature simulation data of cooling water, or to select periodically obtain the current flowing through the potentiometer, calculate the first simulation temperature of the cooling water according to the current flowing through the potentiometer, and use the first simulation temperature as the temperature simulation data of the cooling water.

3. The ship main engine cooling water temperature control simulation method according to claim 2 is characterized in that: The step of calculating the first simulated temperature of the cooling water according to the current flowing through the potentiometer comprises: The first simulated temperature of the cooling water is calculated according to the current flowing through the potentiometer and the first preset proportionality coefficient, and the first simulated temperature of the cooling water is used as the temperature simulation data of the cooling water.

4. The method for simulating the temperature control of cooling water of a ship main engine according to claim 1, characterized in that: The step of calculating the opening of the electric proportional valve according to the temperature simulation data of the cooling water and the first preset temperature includes: A first preset temperature input by a user is obtained, and the opening of the electric proportional valve is calculated according to a difference between the first preset temperature input by the user and the temperature simulation data of the cooling water.

5. The method for simulating the temperature control of cooling water of a ship main engine according to claim 4, characterized in that: The calculation of the opening of the electric proportional valve includes: The driving current of the electric proportional valve is calculated and outputted by using the difference between the first preset temperature and the temperature simulation data of the cooling water and the second preset proportional coefficient, and then the opening of the electric proportional valve is calculated by the driving current of the electric proportional valve.

6. The ship main engine cooling water temperature control simulation method according to claim 5 is characterized in that: The method further comprises: An ammeter and a display screen are arranged between the electric proportional valve and the electric PID control unit, wherein the ammeter is used to detect the driving current, and the display screen is used to display the current cooling water temperature analog data.

7. The ship main engine cooling water temperature control simulation method according to claim 5, characterized in that: The method further comprises: A fuel mode indicator light is provided, the fuel mode indicator light comprising a low-sulfur oil indicator light and a heavy oil indicator light, the fuel mode indicator light is control-connected to a fuel mode switching knob, the fuel mode indicator light and the fuel mode switching knob are both electrically connected to a control chip of an electric PID control unit, when the fuel mode is switched to a low-sulfur oil mode by the fuel mode switching knob, the low-sulfur oil indicator light is lit, and the heavy oil indicator light is off; when the fuel mode is switched to a heavy oil mode by the fuel mode switching knob, the low-sulfur oil indicator light is off, and the heavy oil indicator light is lit.

8. The ship main engine cooling water temperature control simulation method according to claim 1, characterized in that: The method further comprises: A temperature alarm indicator light is provided, and whether to turn on the temperature alarm indicator light is determined according to the current temperature simulation data of the cooling water. The temperature alarm indicator light is electrically connected to the control chip of the electric PID control unit.

9. The ship main engine cooling water temperature control simulation method according to claim 8, characterized in that: The temperature alarm indicator light includes a low-sulfur oil cooling water temperature alarm indicator light and a heavy oil cooling water temperature alarm indicator light. The low-sulfur oil cooling water temperature alarm indicator light is used to indicate that an alarm is triggered when the temperature simulation data of the cooling water reaches a set value in the low-sulfur oil mode, and the heavy oil cooling water temperature alarm indicator light is used to indicate that an alarm is triggered when the temperature simulation data of the cooling water reaches a set value in the heavy oil mode.

10. A ship main engine cooling water temperature control simulation system, characterized in that: The system comprises: An acquisition module (100): used to periodically acquire ambient temperature data of the ship main engine cooling water temperature control simulation device using a temperature sensor arranged in the ship main engine cooling water temperature control simulation device, or to periodically acquire current flowing through a potentiometer; or to acquire a first preset temperature; A control module (200): used to use the ambient temperature data as the temperature simulation data of the cooling water, or to use the first simulation temperature as the temperature simulation data of the cooling water; or to calculate the opening of the electric proportional valve according to the temperature simulation data of the cooling water and the first preset temperature; or to control the action of the electric proportional valve according to the calculated opening of the electric proportional valve, so as to simulate the process of making the temperature of the cooling water reach the first preset temperature.

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