CN114542263B - Cooling water temperature regulation and control method and control system - Google Patents
Cooling water temperature regulation and control method and control system Download PDFInfo
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- CN114542263B CN114542263B CN202210281532.1A CN202210281532A CN114542263B CN 114542263 B CN114542263 B CN 114542263B CN 202210281532 A CN202210281532 A CN 202210281532A CN 114542263 B CN114542263 B CN 114542263B
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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
- F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
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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
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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
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
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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
- F01P2025/00—Measuring
- F01P2025/08—Temperature
- F01P2025/40—Oil temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a cooling water temperature regulation and control method and a cooling water temperature regulation and control system, relates to the technical field of diesel engine control, solves the problems that the existing cooling water regulation and control precision is poor and excessive regulation and control are easy to occur, improves the cooling water regulation and control precision, and has the following specific scheme: the method comprises the steps that a safety control system checks the set temperature Tx of cooling water by detecting the current rotating speed and load of the diesel engine according to a preset temperature set value map; correcting the set temperature Tx of the cooling water according to the oil inlet temperature Tz to obtain a corrected set temperature T1 of the cooling water; the corrected set temperature T1 of the cooling water is compared with the maximum limit temperature Tmax of the cooling water to be smaller, and the optimal set temperature T of the cooling water is finally obtained; after the optimal set temperature T of the cooling water is obtained, calculating the cooling water outlet temperature difference delta T; and regulating the opening of the temperature control valve according to the regulating logic according to the cooling water outlet temperature difference delta T.
Description
Technical Field
The invention relates to the technical field of diesel engine control, in particular to a cooling water temperature regulation and control method and a cooling water temperature regulation and control system.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The high-temperature cooling water is discharged from the engine and then is divided by the temperature control valve, 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 to be pumped into the intercooler and the engine by the engine belt pump so as 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 inventor finds that the existing cooling water regulation and control method mostly adopts a supercharger speed sensor as a selective matching sensor, a diesel engine is not always matched, the outlet temperature of cooling water is detected directly through a temperature sensor, and disturbance can be caused to the outlet temperature of the cooling water due to the influence of the variable rotating speed of the diesel engine on the pump flow of the engine (low rotating speed, low flow and high rotating speed, high flow), the internal actual temperature of the diesel engine cannot be accurately reflected, so that the accurate regulation and control of the cooling water temperature are influenced, the regulation and control precision of the lubricating oil temperature can be further caused, when the lubricating oil temperature is lower than the required temperature, the purpose of rapid warming-up can not be achieved, and when the lubricating oil temperature is too high, the vehicle can be stopped; and the conventional regulating and controlling method has the problems that the opening of the temperature control valve is frequent and too fast, and the excessive regulation and control is easy to occur.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cooling water temperature regulation and control method and a cooling water temperature regulation and control system, wherein a temperature set value map and a cooling water maximum limit temperature Tmax are set, the set temperature Tx of the cooling water can be found according to the current rotating speed and load of a diesel engine, the set temperature Tx is corrected, the accurate regulation and control of a temperature control valve are realized through the matching of difference value calculation and regulation and control logic, and the problems that the existing cooling water is poor in regulation and control precision and easy to generate excessive regulation and control are solved.
In order to realize the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for regulating and controlling a temperature of cooling water, including that a security control system obtains a set temperature Tx of the cooling water by detecting a current rotation speed and a current load of a diesel engine according to a preset temperature set value map;
correcting the set temperature Tx of the cooling water according to the oil inlet temperature Tz to obtain a corrected set temperature T1 of the cooling water;
the corrected set temperature T1 of the cooling water is compared with the maximum limit temperature Tmax of the cooling water to be smaller, and finally the optimal set temperature T of the cooling water is obtained;
after the optimal set temperature T of the cooling water is obtained, calculating the difference value delta T of the outlet temperature of the cooling water;
and regulating the opening of the temperature control valve according to the regulating logic according to the cooling water outlet temperature difference delta T.
As a further implementation manner, the temperature set value map is a parameter coordinate value set in advance according to the engine type, and the temperature set value map is set in the safety control system.
As a further implementation manner, the set temperature of the cooling water is corrected in such a way that when the engine inlet temperature Tz of the lubricating oil is less than or equal to 65 ℃, the set temperature T1= Tx a is corrected by the cooling water; when the oil inlet temperature Tz is greater than 65 ℃, the cooling water corrects the set temperature T1= Tx, and the correction coefficient a =1.1.
As a further implementation manner, the specific process of comparing the cooling water correction setting temperature T1 with the cooling water maximum limiting temperature Tmax is that when T1 is less than Tmax, T = T1; otherwise, when T1 is larger than or equal to Tmax, T = Tmax.
As a further implementation, the cooling water maximum limit temperature Tmax is a high-temperature shutdown limit value of the diesel engine.
As a further implementation manner, the cooling water outlet temperature difference Δ T is a difference between the cooling water optimal set temperature T and the cooling water actual outlet temperature Ty, that is, Δ T = T-Ty.
As a further implementation mode, the regulation and control logic is that when the temperature delta T is less than or equal to minus 1 ℃, the safety control system outputs a descending signal to the temperature control valve, the opening degree of the temperature control valve is increased, the cooling capacity is increased, and the inlet temperature of cooling water is reduced;
when the delta T is more than or equal to 1 ℃, the safety control system outputs an ascending signal to the temperature control valve, the opening of the temperature control valve is reduced, the cooling capacity is reduced, and the temperature of cooling water entering the machine is increased;
when the temperature is higher than minus 1 ℃ and less than delta T and less than 1 ℃, the safety control system does not output signals, the opening of the temperature control valve is kept unchanged, and the temperature of cooling water entering the machine is kept constant.
A second object of the present invention is to provide a cooling water temperature regulation control system, comprising: the information acquisition unit is configured to detect the operating parameters of the diesel engine and transmit the parameters to the security control system;
the safety control system is a control unit, a temperature set value map and a cooling water maximum limit temperature Tmax are preset in the safety control system in advance, the set temperature Tx of the cooling water can be obtained according to the current rotating speed and load of the diesel engine, the set temperature Tx of the cooling water is corrected according to the lubricating oil inlet temperature Tz, the corrected set temperature T1 of the cooling water is compared with the cooling water maximum limit temperature Tmax to be smaller, and finally the optimal set temperature T of the cooling water is obtained;
the temperature control valve is configured to receive a regulation and control signal output by the safety control system, and the opening regulation and control of the valve are realized in an electric drive mode, so that the inlet temperature of cooling water of the diesel engine is adjusted.
As a further implementation manner, the safety control system is further provided with a difference value calculation module and a regulation and control logic module, so that the cooling water outlet temperature difference value delta T can be calculated, and a regulation and control signal is output according to the cooling water outlet temperature difference value delta T to accurately regulate and control the temperature control valve.
As a further implementation mode, the information acquisition unit is composed of a sensor carried on the diesel engine.
The beneficial effects of the invention are as follows:
(1) The safety control system checks the set temperature Tx of the cooling water by detecting the current rotating speed and load of the diesel engine, corrects the set temperature Tx of the cooling water according to the engine entering temperature Tz of the lubricating oil, can improve the adaptive cooling water temperature according to the actual working condition of the diesel engine, can be better beneficial to the transition of the diesel engine to the hot state under the cold state, and can achieve the warming-up purpose more quickly.
(2) The invention sets the cooling water maximum limit temperature Tmax, and the set temperature T1 is corrected through the cooling water and compared with the cooling water maximum limit temperature Tmax to be smaller, so that the problem of stopping caused by overhigh cooling water temperature can be effectively prevented.
(3) According to the invention, through the arrangement of the regulation and control logic module, the temperature control valve can be accurately regulated and controlled according to the cooling water outlet temperature difference delta T, the opening of the temperature control valve is effectively prevented from being frequent and too fast, the regulation and control of the temperature control valve are prevented from being excessive, and the cooling system of the diesel engine is always in an optimal state.
(4) The information acquisition unit is composed of sensors carried by the diesel engine such as a crankshaft position sensor, an oil temperature sensor, a cooling water outlet temperature sensor and the like, is used for detecting parameters such as rotating speed, oil temperature, cooling water temperature and the like, does not need to be matched with a specific sensor, is easier to realize logically, and is suitable for regulating and controlling the cooling water temperature of various diesel engines.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic flow diagram of a cooling water temperature regulation method according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a temperature set point map according to one or more embodiments of the invention;
FIG. 3 is a schematic diagram of a cooling water temperature regulation control system according to one or more embodiments of the present disclosure;
in the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein, 1, diesel engine; 2. a security control system; 3. a temperature control valve.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As introduced in the background art, most of the existing cooling water regulation and control methods directly detect the outlet temperature of cooling water through a temperature sensor, and because the influence of the variable rotating speed of a diesel engine on the flow rate of a pump (low rotating speed, low flow rate and high rotating speed and high flow rate) of the pump with the engine can cause disturbance on the outlet temperature of the cooling water, the actual internal temperature of the diesel engine can not be accurately reflected, so that the accurate regulation and control of the temperature of the cooling water are influenced, the regulation and control precision of the temperature of lubricating oil can be further caused, when the temperature of the lubricating oil is lower than the required temperature, the purpose of fast warming up can not be achieved, and when the temperature of the lubricating oil is too high, the problem of stopping the vehicle can be caused.
Interpretation of related terms:
a temperature control valve: receiving an external control signal, and realizing the control of the valve opening by electrically driving a control valve;
temperature set value map: the abscissa is the rotating speed value of the diesel engine, the ordinate is the load value of the diesel engine, and the set temperature Tx of the cooling water is obtained by checking map through the rotating speed and the load.
Example 1
In an exemplary embodiment of the present invention, as shown in fig. 1 to 2, a method for controlling a temperature of cooling water is provided, which includes the steps of:
firstly, the safety control system 2 of the diesel engine finds the set temperature Tx of the cooling water by detecting the current rotating speed and load of the diesel engine according to the temperature set value map, and corrects the set temperature Tx of the cooling water according to the lubricating oil inlet temperature Tz, so that the most suitable cooling water inlet temperature of the diesel engine can be obtained according to different working conditions of the diesel engine, and the cooling system of the diesel engine is ensured to be always in the optimal state.
The temperature set value map is a parameter coordinate value set in advance according to the engine type, the abscissa is the rotation speed, the ordinate is the load, and the temperature set value map is set in the safety control system 2.
The correction process is that when the temperature Tz of the lubricating oil entering the engine is less than or equal to 65 ℃, the cooling water corrects the set temperature T1= Tx a; when the oil inlet temperature Tz is more than 65 ℃, the cooling water corrects the set temperature T1= Tx.
Wherein, correction coefficient a =1.1, through correction coefficient's settlement, start under the low or diesel engine cold state of external environment temperature, and when the lubricating oil temperature is lower, according to actual diesel engine behavior, improve the cooling water temperature that suits, can be better do benefit to the diesel engine to the transition of hot state under the cold state, can reach the warm-up purpose more fast.
Specifically, when the diesel engine operates at 600rpm and 50% load, tx =85 ℃ is obtained according to a temperature set value map shown in fig. 2, at this time, if the lubricant feeding temperature Tz is 50 ℃, the cooling water corrected set temperature T1=93.5 ℃, the electronic control system controls the opening of the thermostat valve 3 to control the cooling water discharging temperature Ty at 93.5 ℃, and when the lubricant temperature continuously rises to above 65 ℃, the cooling water corrected set temperature T1 is restored to 85 ℃, so that dynamic control of the cooling water corrected set temperature T1 is realized, and rapid warm-up is ensured.
It should be understood that the embodiment provides a temperature set point map for convenience of illustration only, and in other embodiments, the specific value of the temperature set point map needs to be designed according to the actual diesel engine category, which is not limited herein.
The rotation speed is measured by a crankshaft position sensor, the calculation process of the load is that the ratio of the power sent by the engine at the time to the maximum power possibly sent at the same rotation speed is expressed in percentage, and the load of the engine needs to be calculated according to actual requirements due to different engine loads of different types, and the specific calculation process is not described in detail herein.
And when the cooling water correction set temperature T1 is obtained, comparing the cooling water correction set temperature T1 with the cooling water maximum limit temperature Tmax, and reducing to finally obtain the optimal cooling water set temperature T.
The specific process of comparing the cooling water correction set temperature T1 with the cooling water maximum limiting temperature Tmax is that when T1 is less than Tmax, T = T1; otherwise, when T1 is larger than or equal to Tmax, then T = Tmax.
In the embodiment, the maximum cooling water limiting temperature Tmax =95 ℃, in other embodiments, a specific value of the maximum cooling water limiting temperature Tmax is set according to an actual diesel engine type, as long as it is ensured that the diesel engine is not stopped at a high temperature, that is, the maximum cooling water limiting temperature Tmax is a high-temperature stop limit value of different types of diesel engines, and no excessive limitation is made here.
By setting the maximum limit temperature Tmax of the cooling water, the problem of stopping the vehicle caused by overhigh temperature of the cooling water can be effectively prevented.
In this embodiment, the cooling water set temperature Tx is measured by the rotation speed and load of the diesel engine, the lubricating oil inlet temperature Tz is measured by a lubricating oil temperature sensor on the diesel engine, signals such as water temperature and oil temperature are obtained by monitoring sensors necessary for the diesel engine, the selection of the sensors according to the engine type is not needed, and the method is applicable to the regulation and control of the water temperature and the oil temperature of all types of diesel engines.
After the optimal set temperature T of the cooling water is obtained, a cooling water machine outlet temperature difference Δ T needs to be calculated, specifically, the cooling water machine outlet temperature difference Δ T is a difference between the optimal set temperature T of the cooling water and the actual machine outlet temperature Ty of the cooling water, that is, Δ T = T-Ty.
The actual outlet temperature Ty of the cooling water in the embodiment is obtained by detecting the outlet temperature sensor of the cooling water and is also the type of the necessary sensor of the diesel engine, and the selection and the matching are not needed, so that the use cost is greatly reduced.
After the cooling water outlet temperature difference value delta T is calculated, the safety control system 2 regulates and controls the opening of the temperature control valve 3 according to the cooling water outlet temperature difference value delta T, wherein the safety control system 2 is provided with a regulation and control logic module of the temperature control valve 3, the regulation and control logic module is provided with regulation and control logic of the temperature control valve 3, and the temperature control valve 3 can be accurately regulated and controlled according to the cooling water outlet temperature difference value delta T.
Specifically, when the delta T is less than or equal to minus 1 ℃, the outlet temperature Ty of the cooling water is higher, the safety control system 2 outputs a 'descending' signal to the temperature control valve 3, the opening of the temperature control valve 3 is increased, the cooling amount is increased, and the inlet temperature of the cooling water is reduced;
when the delta T is more than or equal to 1 ℃, the outlet temperature Ty of the cooling water is lower, the safety control system 2 outputs an ascending signal to the temperature control valve 3, the opening degree of the temperature control valve 3 is reduced, the cooling amount is reduced, and the inlet temperature of the cooling water is increased;
when the temperature is lower than minus 1 ℃ and is lower than delta T and lower than 1 ℃, the safety control system 2 does not output signals, the opening degree of the temperature control valve 3 is kept unchanged, and the temperature of cooling water entering the machine is kept constant.
Through the setting of regulation and control logic module, can effectually prevent that 3 apertures of temperature-sensing valve are frequent too fast, avoid the regulation and control of temperature-sensing valve 3 excessive for diesel engine cooling system is in optimal state always.
Example 2
In another exemplary embodiment of the present invention, as shown in fig. 3, there is provided a cooling water temperature regulation control system including:
the information acquisition unit is composed of sensors carried by the diesel engine 1 such as a crankshaft position sensor, an oil temperature sensor, a cooling water outlet temperature sensor and the like, and is used for detecting diesel engine operating parameters such as rotating speed, oil temperature, cooling water temperature and the like.
The information acquisition unit on the diesel engine 1 is connected with the security control system 2, and detected parameters such as water temperature, oil temperature, rotating speed and load are transmitted into the security control system 2.
The safety control system 2 is a control unit which is responsible for controlling oil injection, parameter detection, fault treatment and the like of the diesel engine, a temperature set value map and a cooling water maximum limiting temperature Tmax are preset in the safety control system 2 in advance, a set temperature Tx of cooling water can be obtained according to the current rotating speed and load of the diesel engine, the set temperature Tx of the cooling water is corrected according to the engine inlet temperature Tz of lubricating oil, the corrected set temperature T1 of the cooling water is compared with the cooling water maximum limiting temperature Tmax to be reduced, and finally the optimal set temperature T of the cooling water is obtained;
the safety control system 2 is also provided with a difference value calculation module and a regulation and control logic module, can calculate the cooling water outlet temperature difference delta T, and can output a regulation and control signal according to the cooling water outlet temperature difference delta T to accurately regulate and control the temperature control valve 3.
And the temperature control valve 3 is configured to receive the regulation and control signal output by the safety control system 2, and the opening regulation and control of the valve are realized in an electric driving mode, so that the cooling water inlet temperature of the diesel engine 1 is adjusted.
It can be understood that the working method of the cooling water temperature regulation and control system is the same as that provided in embodiment 1, and specific reference may be made to the detailed description in embodiment 1, and redundant description is not repeated here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cooling water temperature regulation method is characterized by comprising the following steps:
the safety control system checks the set temperature Tx of the cooling water by detecting the current rotating speed and load of the diesel engine according to a preset temperature set value map;
correcting the set temperature Tx of the cooling water according to the lubricating oil inlet temperature Tz to obtain a corrected set temperature T1 of the cooling water;
the corrected set temperature T1 of the cooling water is compared with the maximum limit temperature Tmax of the cooling water to be smaller, and the optimal set temperature T of the cooling water is finally obtained;
after the optimal set temperature T of the cooling water is obtained, calculating the difference value delta T of the outlet temperature of the cooling water;
and regulating the opening of the temperature control valve according to the regulating logic according to the cooling water outlet temperature difference delta T.
2. The cooling water temperature control method according to claim 1, wherein the temperature set value map is a parameter coordinate value set in advance according to an engine type, and the temperature set value map is set in a safety control system.
3. The cooling water temperature control method according to claim 1, wherein the set temperature correction process of the cooling water is to correct the set temperature T1= Tx a when the lubricant oil inlet temperature Tz is less than or equal to 65 ℃; when the oil inlet temperature Tz is greater than 65 ℃, the cooling water corrects the set temperature T1= Tx, and the correction coefficient a =1.1.
4. A cooling water temperature regulation method according to claim 1, characterized in that the specific procedure in which the cooling water correction setting temperature T1 is compared with the cooling water maximum limit temperature Tmax is taken to be small is that, when T1 < Tmax, T = T1; otherwise, when T1 is larger than or equal to Tmax, T = Tmax.
5. The cooling water temperature regulation method according to claim 1, characterized in that the cooling water maximum limit temperature Tmax is a high-temperature stop limit value of a diesel engine.
6. The cooling water temperature control method according to claim 1, wherein the cooling water outlet temperature difference Δ T is a difference between the cooling water optimum set temperature T and the cooling water actual outlet temperature Ty, that is, Δ T = T-Ty.
7. The cooling water temperature regulating method according to claim 1, wherein the regulating logic is that when delta T is less than or equal to-1 ℃, the safety control system outputs a 'falling' signal to the temperature control valve, the opening degree of the temperature control valve is increased, the cooling capacity is increased, and the inlet temperature of the cooling water is reduced;
when the delta T is more than or equal to 1 ℃, the safety control system outputs an ascending signal to the temperature control valve, the opening of the temperature control valve is reduced, the cooling capacity is reduced, and the temperature of cooling water entering the machine is increased;
when the temperature delta T is higher than-1 ℃ and lower than 1 ℃, the safety control system does not output signals, the opening degree of the temperature control valve is kept unchanged, and the temperature of cooling water entering the machine is kept constant.
8. A cooling water temperature regulation control system, characterized by comprising:
the information acquisition unit is configured to detect the operating parameters of the diesel engine and transmit the parameters to the security control system;
the safety control system is a control unit, a temperature set value map and a cooling water maximum limit temperature Tmax are preset in the safety control system in advance, the set temperature Tx of the cooling water can be obtained according to the current rotating speed and load of the diesel engine, the set temperature Tx of the cooling water is corrected according to the lubricating oil inlet temperature Tz, the corrected set temperature T1 of the cooling water is compared with the cooling water maximum limit temperature Tmax to be smaller, and finally the optimal set temperature T of the cooling water is obtained;
the temperature control valve is configured to receive a regulation and control signal output by the safety control system, and the opening regulation and control of the valve are realized in an electric driving mode, so that the inlet temperature of cooling water of the diesel engine is adjusted.
9. The cooling water temperature regulation and control system according to claim 8, wherein the safety control system is further provided with a difference calculation module and a regulation and control logic module, and the difference calculation module and the regulation and control logic module can calculate the cooling water outlet temperature difference DeltaT and output a regulation and control signal according to the cooling water outlet temperature difference DeltaT to accurately regulate and control the temperature control valve.
10. The cooling water temperature regulation and control system according to claim 8, wherein the information acquisition unit is formed by a sensor on the diesel engine.
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