CN112594051A - Control method and control system for temperature of high-temperature cooling water of diesel engine - Google Patents
Control method and control system for temperature of high-temperature cooling water of diesel engine Download PDFInfo
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- CN112594051A CN112594051A CN202011436539.3A CN202011436539A CN112594051A CN 112594051 A CN112594051 A CN 112594051A CN 202011436539 A CN202011436539 A CN 202011436539A CN 112594051 A CN112594051 A CN 112594051A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
Abstract
The invention discloses a control method and a control system for the temperature of high-temperature cooling water of a diesel engine, which relate to the field of diesel engines and are used for acquiring the real-time temperature Tx1 and the real-time working condition of a mixing point; according to the real-time working condition, the temperature set value of the mixing point is found; comparing the mixing point real-time temperature Tx1 to the mixing point temperature setpoint T1; generating a corresponding control signal according to the comparison result; and controlling the opening of the electric valve according to the control signal. The invention utilizes the temperature of the mixing point to control the outlet temperature of the cooling water, and solves the problem that the disturbance of the outlet temperature of the cooling water caused by the flow change of the pump of the machine belt caused by frequent load change and rotating speed change can not be quickly recovered due to too long distance between the control point and the actuating mechanism; the temperature of the cooling water discharged from the machine can be kept stable.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a method and a system for controlling the temperature of high-temperature cooling water of a diesel engine.
Background
The high-temperature water system of the large-bore marine diesel engine is shown in figure 1. The high-temperature cooling water is discharged from the engine and then is divided by the electric valve 2, and a part of the high-temperature cooling water is cooled by the cooling water condenser and then is mixed with uncooled high-temperature cooling water and pumped into the intercooler and the engine by the belt pump to cool the pressurized air and the engine.
In the prior art, the flow of a branch of a cooling water condenser is adjusted by controlling the opening of an electric valve according to the difference between the real-time temperature of the high-temperature cooling water outlet machine and the set value of the high-temperature cooling water outlet machine temperature, so that the real-time temperature of the high-temperature cooling water outlet machine reaches the requirement of the set value of the high-temperature cooling water outlet machine temperature.
The existing control method can meet the control requirement under the working condition of stable load. However, under the working condition that the load frequently fluctuates (for example, a ship provided with a fixed paddle sails in a narrow water channel, enters and exits a port or is in a heavy storm sea condition), because the influence of the variable rotating speed on the pump flow of the engine (low rotating speed, low flow, high rotating speed and high flow) and the reaction lag caused by the distance between a water mixing point and an engine outlet (a pipeline between a mixing point and an engine air cooler, an air cooler and an engine) cannot be recovered, the disturbance on the output temperature of the high-temperature cooling water caused by the load fluctuation cannot be recovered, and the high-temperature cooling water output temperature can often reach the parking alarm value to be stopped emergently.
Disclosure of Invention
Aiming at the defects, the technical problems to be solved by the invention are as follows: a method and a system for controlling the temperature of high-temperature cooling water of a diesel engine are provided, wherein the dynamic response of the control of the temperature of the high-temperature cooling water is improved by changing a fixed temperature control set value into a dynamic temperature set value related to working conditions, and the temperature of the high-temperature cooling water can be kept stable when the disturbance of large-range load fluctuation or rotation speed fluctuation of the diesel engine occurs.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for controlling the temperature of high-temperature cooling water of a diesel engine comprises the following steps:
acquiring a mixing point real-time temperature Tx1 and a real-time working condition;
obtaining a mixing point temperature set value T1 according to real-time working conditions;
comparing the mixing point real-time temperature Tx1 to the mixing point temperature setpoint T1;
generating a corresponding control signal according to the comparison result;
and controlling the opening of the electric valve according to the control signal.
Preferably, the obtaining of the set value T1 of the mixing point temperature according to the real-time working condition includes the following steps:
acquiring a first real-time rotating speed n1 of the supercharger;
according to the first real-time rotating speed n1, checking a set value T2 of the outlet temperature of the cooling water;
the cooling water outlet temperature set value T2 is differed from the mixing point real-time temperature Tx1 to obtain a temperature difference value delta T;
calculating a pre-calculated value Tv of the mixing point temperature by using a formula Tv which is T2-delta T;
the pre-calculated mixing point temperature Tv is taken as the mixing point temperature set value T1.
Preferably, after the step of obtaining the temperature difference Δ T, the method further includes the following steps:
acquiring a second real-time rotating speed n2 of the engine;
according to the second real-time rotating speed n2, the flow factor K is foundF；
Using flow factor KFCorrecting the temperature difference delta T;
using the formula Tv-T2- Δ T KFCalculating a pre-calculated value Tv of the temperature of the mixing point;
the pre-calculated mixing point temperature Tv is taken as the mixing point temperature set value T1.
Preferably, the method further includes the following steps after obtaining the mixing point temperature set value T1:
acquiring the real-time temperature Tx2 of the cooling water discharged from the machine;
according to the real-time working condition and the real-time temperature Tx2 of the cooling water outlet machine, checking and correcting the set temperature Tx of the cooling water outlet machine;
the mixing point temperature set value T1 is corrected by the corrected cooling water discharge set temperature Tx.
Preferably, before the step of obtaining the mixing point real-time temperature Tx1 and the cooling water outlet real-time temperature Tx2, the method further comprises a data filtering processing step of:
filtering the obtained mixing point real-time temperature Tx1 to obtain a stable mixing point real-time temperature Tx 1; and/or the presence of a gas in the gas,
and filtering the obtained real-time outlet temperature Tx2 of the cooling water to obtain stable real-time outlet temperature Tx2 of the cooling water.
Preferably, the filtering process is: after the maximum value and the minimum value of the mixing point real-time temperature Tx1 or the cooling water outlet real-time temperature Tx2 are removed, the average value is obtained and is used as the stable mixing point real-time temperature Tx1 or the stable cooling water outlet real-time temperature Tx 2.
Preferably, when the second real-time speed n2 is the rated engine speed, the flow factor K isFIs 1; when the second real-time speed n2 is not the rated engine speed, the flow factor KFIs 1.12.
A control system for the temperature of high-temperature cooling water of a diesel engine comprises a main control unit and a control unit, wherein the main control unit is electrically connected with the main control unit: the data acquisition unit is used for acquiring the real-time temperature Tx1 and the real-time working condition of the mixing point and then acquiring a set value T1 of the mixing point temperature according to the real-time working condition; the data comparison unit is used for comparing the mixing point real-time temperature Tx1 with a mixing point temperature set value T1 and generating a corresponding control signal according to the comparison result; one end of the electric valve is connected with the cooling water condenser, the other end of the electric valve is connected with the engine cooling water outlet, and the third end of the electric valve is connected with the mixing point; the first temperature sensor is arranged at the mixing point and is used for collecting the temperature of the mixing point; the second temperature sensor is arranged at the cooling water outlet of the engine and is used for collecting the outlet temperature of the cooling water; the main control unit is used for controlling the opening of the electric valve according to the control signal and adjusting the outlet temperature of the cooling water by adjusting the temperature of the mixing point.
Preferably, the system further comprises a preset unit electrically connected with the main control unit, wherein the preset unit is used for presetting a set value T2 of the outlet temperature of the cooling water according to the first real-time rotating speed n1 of the supercharger; the presetting unit is used for presetting a flow factor K according to a second real-time rotating speed n2 of the engineF。
Preferably, the device further comprises a data filtering unit electrically connected with the main control unit, wherein the data filtering unit is used for calculating the average value of the real-time temperature of the mixing point and taking the average value of the real-time temperature of the mixing point as the real-time temperature of the mixing point.
After the technical scheme is adopted, the invention has the beneficial effects that:
the invention relates to a control method and a control system for the temperature of high-temperature cooling water of a diesel engine, wherein the control method comprises the following steps: acquiring a mixing point real-time temperature Tx1 and a real-time working condition; obtaining a mixing point temperature set value T1 according to real-time working conditions; comparing the mixing point real-time temperature Tx1 to the mixing point temperature setpoint T1; generating a corresponding control signal according to the comparison result; and controlling the opening of the electric valve according to the control signal. The invention utilizes the temperature of the mixing point to control the outlet temperature of the cooling water, and solves the problem that the disturbance of the outlet temperature of the cooling water caused by the flow change of the pump of the machine belt caused by frequent load change and rotating speed change can not be quickly recovered due to too long distance between the control point and the actuating mechanism; the high-temperature cooling water outlet temperature can be kept stable.
The invention changes the fixed temperature control set value into the dynamic temperature set value related to the working condition, thereby improving the dynamic response of the high-temperature cooling water temperature control, and the high-temperature cooling water temperature can be kept stable when the disturbance of large-scale load fluctuation or rotating speed fluctuation of the diesel engine occurs.
Drawings
FIG. 1 is a schematic structural diagram of a control system for the temperature of high-temperature cooling water of the diesel engine;
FIG. 2 is a logic diagram of the control method for the temperature of high-temperature cooling water of the diesel engine according to the invention;
FIG. 3 is a flow chart of a method for controlling the temperature of high-temperature cooling water of a diesel engine according to the invention;
FIG. 4 is a functional block diagram of a control system for the temperature of high temperature cooling water in a diesel engine;
in the figure: 1-an engine cooling water outlet, 2-an electric valve, 3-a cooling water condenser, 4-a first temperature sensor, 5-a second temperature sensor and 6-a machine belt pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1 to 3, a method for controlling the temperature of high-temperature cooling water of a diesel engine is applied to a system for controlling the temperature of high-temperature cooling water of the diesel engine, and comprises the following steps:
s1, acquiring a mixing point real-time temperature Tx1 and a real-time working condition;
s2, obtaining a mixing point temperature set value T1 according to real-time working conditions;
step S3, comparing the mixing point real-time temperature Tx1 with a mixing point temperature set value T1;
step S4, generating a corresponding control signal according to the comparison result;
in step S5, the opening degree of the electric valve is controlled based on the control signal.
The control method of the invention introduces the temperature measuring point of the mixing point, shortens the distance between the control point and the actuating mechanism by converting the original real-time temperature of the high-temperature cooling water discharged from the machine into the real-time temperature of the mixing point, and solves the control problem caused by the change of the control point. The dynamic response of the high-temperature cooling water temperature control is improved by changing the fixed temperature control set value into a dynamic temperature set value related to the working condition, and the high-temperature cooling water temperature can be kept stable when the disturbance of large-range load fluctuation or rotating speed fluctuation of the diesel engine occurs.
In this example, step S2 includes the steps of:
s20, acquiring a first real-time rotating speed n1 of the supercharger;
s21, according to the first real-time rotating speed n1, the set value T2 of the cooling water outlet temperature is obtained;
step S22, subtracting the cooling water outlet temperature set value T2 and the mixing point real-time temperature Tx1 to obtain a temperature difference value delta T;
step S23, calculating a pre-calculated value Tv of the mixing point temperature by using a formula Tv-T2-delta T;
step S24, the pre-calculated mixing point temperature Tv is used as the set mixing point temperature value T1.
By adopting a method of pre-calculating a set value, a temperature difference value delta T characteristic curve is preset to establish association among the high-temperature cooling water outlet temperature, the mixing point temperature and the load.
In this example, after step S22, the method further includes the following steps:
acquiring a second real-time rotating speed n2 of the engine;
according to the second real-time rotating speed n2, the flow factor K is foundF(ii) a When the second real-time speed n1 is the rated engine speed, the flow factor KFIs 1; when the second real-time speed n2 is not the rated engine speed, the flow factor KFIs 1.12.
Using flow factor KFCorrecting the temperature difference delta T;
using the formula Tv-T2- Δ T KFCalculating a pre-calculated value Tv of the temperature of the mixing point;
the pre-calculated mixing point temperature Tv is taken as the mixing point temperature set value T1.
The problem of influence of flow reduction of the pump in the machine area caused by reduction of the rotating speed on temperature control is solved by introducing the flow factor KF in the pre-calculation process of the temperature set value of the mixing point.
In this example, after obtaining the mixing point temperature setpoint T1, the method further includes the following steps:
acquiring the real-time temperature Tx2 of the cooling water discharged from the machine;
according to the real-time working condition and the real-time temperature Tx2 of the cooling water outlet machine, checking and correcting the set temperature Tx of the cooling water outlet machine;
the mixing point temperature set value T1 is corrected by the corrected cooling water discharge set temperature Tx.
The step ensures that the method of the invention maintains the temperature control method in the prior art, can avoid the failure of the supercharger, can avoid the pre-calculated value Tv of the mixed point temperature being zero when the first real-time rotating speed n1 is collected inaccurately (for example, when the rotating speed sensor of the collected supercharger is failed, the collected first real-time rotating speed n1 is zero), can obtain the real-time temperature Tx2 of the cooling water outlet machine by using the temperature control method in the prior art, can still normally control the electric valve by using the real-time temperature Tx2 of the cooling water outlet machine as the set value T1 of the mixed point temperature, and can keep the outlet temperature of the high-temperature cooling water stable, thereby improving the reliability of the invention.
As shown in fig. 2, before the step of obtaining the mixing point real-time temperature Tx1 and the cooling water outlet real-time temperature Tx2, a data filtering processing (PT 2 in the figure) step is further included:
filtering the obtained mixing point real-time temperature Tx1 to obtain a stable mixing point real-time temperature Tx 1; and/or filtering the acquired real-time outlet temperature Tx2 of the cooling water to obtain the stable real-time outlet temperature Tx2 of the cooling water. Wherein the filtering process is as follows: after the maximum value and the minimum value of the mixing point real-time temperature Tx1 or the cooling water outlet real-time temperature Tx2 are removed, the average value is obtained and is used as the stable mixing point real-time temperature Tx1 or the stable cooling water outlet real-time temperature Tx 2. Through the data filtering processing step, the acquired data are more stable and reliable, the control of the electric valve is more accurate, and the outlet temperature of the cooling water is more stable finally.
As shown in fig. 1 to 3, the principle of the control method of the present invention is: the original high-temperature cooling water outlet temperature of a control object is changed into the mixing point temperature, and the high-temperature cooling water outlet temperature needs to be controlled by controlling the mixing point temperature under different load working conditions, so that the load, the high-temperature cooling water outlet temperature and the mixing point temperature need to be correlated. A temperature difference characteristic curve is obtained through test measurement, and a cooling water outlet temperature set value T2 which is required to be reached by the high-temperature cooling water outlet temperature when different loads (represented by a supercharger rotating speed signal) are carried out can be directly obtained according to the curve, and a specific temperature difference value delta T is required to be reached between the mixing point real-time temperature Tx1 and the high-temperature cooling water outlet temperature set value T2. Because the flow of the belt pump 6 changes under different engine rotating speeds, the flow is reduced when the engine rotating speed is low, the cooling effect is reduced, the water inlet temperature is required to be reduced, namely, the temperature difference delta T is increased, and the flow factor K is introduced on the basis of the temperature difference delta TFTo solve the above problems. Subtracting delta T from the set high-temperature cooling water outlet temperature T2FThe pre-calculated set point temperature Tv (Tv is T2- Δ T K) is obtainedF)。
The mixing point temperature precalculated set Tv is corrected by correcting the cooling water outlet set temperature Tx to obtain a mixing point temperature set value T1, the opening of the electric valve 2 is controlled according to the mixing point temperature set value T1 and the mixing point real-time temperature Tx1, so that the mixing point real-time temperature Tx1 is stabilized at the mixing point temperature set value T1, and at the moment, according to a characteristic curve, the high-temperature cooling water outlet temperature can be stabilized at the cooling water outlet set temperature set value T2.
Example two:
as shown in fig. 1, 2 and 4, a system for controlling the temperature of high-temperature cooling water of a diesel engine comprises a main control unit, a data acquisition unit, a data comparison unit, an electric valve 2, a first temperature sensor 4 and a second temperature sensor 5, wherein the data acquisition unit is electrically connected with the main control unit respectively.
The data acquisition unit is used for acquiring the real-time temperature Tx1 and real-time working conditions of the mixing point, and then acquiring a set value T1 of the temperature of the mixing point according to the real-time working conditions;
the data processing unit is used for comparing the mixing point real-time temperature Tx1 with a mixing point temperature set value T2 and generating a corresponding control signal according to a comparison result;
wherein one end of the electric valve 2 is connected with the cooling water condenser 3, the other end of the electric valve is connected with the engine cooling water outlet 1, and the third end of the electric valve is connected with the mixing point;
wherein the first temperature sensor 4 is arranged at the mixing point and is used for collecting the temperature of the mixing point;
wherein the second temperature sensor 5 is arranged at the cooling water outlet of the engine and is used for collecting the outlet temperature of the cooling water;
the main control unit is used for controlling the opening of the electric valve 2 according to the control signal and adjusting the outlet temperature of the cooling water by adjusting the temperature of the mixing point.
The system also comprises a preset unit electrically connected with the main control unit, wherein the preset unit is used for presetting a set value T2 of the outlet temperature of the cooling water according to the rotating speed of the supercharger; the presetting unit is used for presetting a flow factor K according to the rotating speed of the engineF. The presetting unit is also used for presetting according to the engine speed and the real-time temperature Tx2 of the cooling water outlet in the embodimentAnd correcting the set temperature Tx of the cooling water outlet machine.
The system also comprises a data filtering unit electrically connected with the main control unit, wherein the data filtering unit is used for calculating the average value of the real-time temperatures of the mixing points and the average value of the real-time temperatures of the cooling water outlets, taking the average value of the real-time temperatures of the mixing points as the real-time temperature Tx1 of the mixing points, and taking the average value of the real-time temperatures of the cooling water outlets as the real-time temperature Tx2 of the cooling water outlets.
The control system for the high-temperature cooling water temperature of the diesel engine changes the original high-temperature cold water outlet temperature of a control object into the mixing point temperature, and needs to control the high-temperature water outlet temperature by controlling the mixing point temperature under different load working conditions, so that the load, the high-temperature water outlet temperature and the mixing point temperature need to be associated.
The main control unit starts the data acquisition unit to work, the first temperature sensor 4 continuously acquires the real-time temperature of the mixing point, the temperature is converted into a corresponding electric signal to be transmitted to the data filtering unit, the maximum value and the minimum value are removed through the data filtering unit, the average value is used as the real-time temperature Tx1 of the mixing point to be transmitted to the data acquisition unit after the average value is obtained, meanwhile, the second temperature sensor 5 continuously acquires the real-time temperature of the high-temperature cooling water out of the machine, the temperature is converted into a corresponding electric signal to be transmitted to the data filtering unit, the maximum value and the minimum value are removed through the data filtering unit, and the average value is used as the real-time temperature Tx2 of the cooling water out of the machine to be. Meanwhile, a first real-time rotating speed n1 of the supercharger is continuously acquired by a first rotating speed sensor arranged on the supercharger, converted into a corresponding electric signal and transmitted to a data acquisition unit; and a second real-time rotating speed sensor arranged on the engine continuously acquires a second real-time rotating speed n2 of the engine, converts the second real-time rotating speed n2 into a corresponding electric signal and transmits the electric signal to the data acquisition unit.
The data acquisition unit transmits the mixing point real-time temperature Tx1, the cooling water outlet real-time temperature Tx2, the first real-time rotating speed n1 and the second real-time rotating speed n2 to the main control unit, and the main control unit starts the data comparison unit again. The main control unit finds the set value T2 of the temperature of the cooling water discharged from the machine according to the first real-time rotating speed n1, and the cooling water is discharged from the machineThe temperature set value T2 is differed from the mixing point real-time temperature Tx1 to obtain a temperature difference value delta T; calculating a pre-calculated value Tv of the mixing point temperature by using a formula Tv which is T2-delta T; then according to the second real-time rotating speed n2, the flow factor K is foundF(ii) a Wherein the flow factor KF1 when the second real-time rotating speed n2 is the rated rotating speed of the engine; when the second real-time rotating speed n2 is not the rated rotating speed of the engine, 1.12 is taken; using flow factor KFCorrecting the temperature difference delta T; then, the formula Tv is T2- Δ T KFCalculating a pre-calculated value Tv of the temperature of the mixing point; finally, the mixing point temperature pre-calculated value Tv is transmitted to the main control unit as a mixing point temperature set value T1, and a mixing point temperature set value T1.
The main control unit also checks and corrects the set temperature Tx of the cooling water outlet machine according to the real-time working condition and the real-time temperature Tx2 of the cooling water outlet machine; the mixing point temperature set value T1 is corrected by the corrected cooling water discharge set temperature Tx. The method can avoid the failure of the supercharger, when the acquisition of the first real-time rotating speed n1 is inaccurate (for example, when the acquisition of the rotating speed sensor of the supercharger fails, the acquired first real-time rotating speed n1 is zero, and the pre-calculated value Tv of the temperature of the mixing point is zero), the real-time temperature Tx2 of the cooling water outlet machine is acquired by using a temperature control method in the prior art, and the real-time temperature Tx2 of the cooling water outlet machine is used as the set value T1 of the temperature of the mixing point, so that the electric valve can be normally controlled, the outlet temperature of the high-temperature cooling water is kept stable, and the reliability of the method is improved.
The main control unit transmits the electric signal corresponding to the mixing point temperature set value T1 to the data comparison unit, the data comparison unit generates a corresponding control signal, and after the control signal is transmitted to the main control unit, the main control unit controls the opening of the electric valve 2 to adjust the mixing point temperature, and finally the purpose of adjusting the outlet temperature of the high-temperature cooling water to keep stable is achieved.
In summary, compared with the prior art, the control system of the present invention:
1. the high-temperature water outlet temperature control structure is innovated, the changed control point is changed from the original direct control of the outlet temperature of the high-temperature cooling water to the control of the outlet temperature of the high-temperature cooling water by controlling the temperature of the mixing point.
2. Establishing association among the high-temperature water outlet temperature, the mixing point temperature and the load by presetting a temperature difference delta T characteristic curve by adopting a method of 'setting value precalculation'; the control problem caused after the control point is changed is solved.
3. Introducing a flow factor KFThe problem of the influence of the flow reduction of the pump on the temperature control caused by the reduction of the rotating speed is solved.
The above-mentioned preferred embodiments of the present invention are not intended to limit the present invention, and any modification made within the spirit and principle of the present invention, equivalent to the control method and control system improvement of the high temperature cooling water temperature of the diesel engine, should be included in the protection scope of the present invention.
Claims (10)
1. A method for controlling the temperature of high-temperature cooling water of a diesel engine is characterized by comprising the following steps:
acquiring a mixing point real-time temperature Tx1 and a real-time working condition;
obtaining a mixing point temperature set value T1 according to real-time working conditions;
comparing the mixing point real-time temperature Tx1 to the mixing point temperature setpoint T1;
generating a corresponding control signal according to the comparison result;
and controlling the opening of the electric valve according to the control signal.
2. The method for controlling the temperature of high-temperature cooling water of the diesel engine according to claim 1, wherein the step of obtaining the mixing point temperature set value T1 according to the real-time working condition comprises the following steps:
acquiring a first real-time rotating speed n1 of the supercharger;
according to the first real-time rotating speed n1, checking a set value T2 of the outlet temperature of the cooling water;
the cooling water outlet temperature set value T2 is differed from the mixing point real-time temperature Tx1 to obtain a temperature difference value delta T;
calculating a pre-calculated value Tv of the mixing point temperature by using a formula Tv which is T2-delta T;
the pre-calculated mixing point temperature Tv is taken as the mixing point temperature set value T1.
3. The method for controlling the temperature of high-temperature cooling water of a diesel engine according to claim 2, further comprising the following steps after the step of obtaining the temperature difference Δ T:
acquiring a second real-time rotating speed n2 of the engine;
according to the second real-time rotating speed n2, the flow factor K is foundF；
Using flow factor KFCorrecting the temperature difference delta T;
then the formula Tv is T2- Δ T KFCalculating a pre-calculated value Tv of the temperature of the mixing point;
the pre-calculated mixing point temperature Tv is taken as the mixing point temperature set value T1.
4. The method for controlling the temperature of high-temperature cooling water of a diesel engine according to any one of claims 1 to 3, wherein after obtaining the mixing point temperature set value T1, the method further comprises the following steps:
acquiring the real-time temperature Tx2 of the cooling water discharged from the machine;
according to the real-time working condition and the real-time temperature Tx2 of the cooling water outlet machine, checking and correcting the set temperature Tx of the cooling water outlet machine;
the mixing point temperature set value T1 is corrected by the corrected cooling water discharge set temperature Tx.
5. The method for controlling the temperature of high-temperature cooling water of the diesel engine according to claim 4, wherein before the step of obtaining the mixing point real-time temperature Tx1 and the cooling water outlet real-time temperature Tx2, the method further comprises a data filtering processing step of:
filtering the obtained mixing point real-time temperature Tx1 to obtain a stable mixing point real-time temperature Tx 1; and/or the presence of a gas in the gas,
and filtering the obtained real-time outlet temperature Tx2 of the cooling water to obtain stable real-time outlet temperature Tx2 of the cooling water.
6. The method for controlling the temperature of high-temperature cooling water of the diesel engine according to claim 5, wherein the filtering process is: after the maximum value and the minimum value of the mixing point real-time temperature Tx1 or the cooling water outlet real-time temperature Tx2 are removed, the average value is obtained and is used as the stable mixing point real-time temperature Tx1 or the stable cooling water outlet real-time temperature Tx 2.
7. The method for controlling the temperature of high-temperature cooling water of a diesel engine according to claim 3,
when the second real-time speed n2 is the rated engine speed, the flow factor KFIs 1;
when the second real-time speed n2 is not the rated engine speed, the flow factor KFIs 1.12.
8. The system for controlling the temperature of the high-temperature cooling water of the diesel engine is characterized by comprising a main control unit and a control unit, wherein the main control unit is electrically connected with the main control unit:
the data acquisition unit is used for acquiring the real-time temperature Tx1 and the real-time working condition of the mixing point and then acquiring a set value T1 of the mixing point temperature according to the real-time working condition;
the data comparison unit is used for comparing the mixing point real-time temperature Tx1 with a mixing point temperature set value T1 and generating a corresponding control signal according to the comparison result;
one end of the electric valve is connected with the cooling water condenser, the other end of the electric valve is connected with the engine cooling water outlet, and the third end of the electric valve is connected with the mixing point;
the first temperature sensor is arranged at the mixing point and is used for collecting the temperature of the mixing point;
the second temperature sensor is arranged at the cooling water outlet of the engine and is used for collecting the outlet temperature of the cooling water;
the main control unit is used for controlling the opening of the electric valve according to the control signal and adjusting the outlet temperature of the cooling water by adjusting the temperature of the mixing point.
9. The system for controlling the temperature of high-temperature cooling water of the diesel engine according to claim 8, further comprising a presetting unit electrically connected with the main control unit, wherein the presetting unit is used for presetting a set value T2 of the outlet temperature of the cooling water according to the first real-time rotating speed n1 of the supercharger; the presetting unit is used for presetting a flow factor K according to a second real-time rotating speed n2 of the engineF。
10. The system for controlling the temperature of high-temperature cooling water in a diesel engine according to claim 8, further comprising a data filtering unit electrically connected to the main control unit, wherein the data filtering unit is configured to average the real-time temperature of the mixing point and take the average of the real-time temperature of the mixing point as the real-time temperature of the mixing point.
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| CN114542263A (en) * | 2022-03-22 | 2022-05-27 | 潍柴动力股份有限公司 | Cooling water temperature regulation and control method and control system |
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