CN112177752A - Control method and control system of engine thermal management module - Google Patents

Control method and control system of engine thermal management module Download PDF

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Publication number
CN112177752A
CN112177752A CN202010850484.4A CN202010850484A CN112177752A CN 112177752 A CN112177752 A CN 112177752A CN 202010850484 A CN202010850484 A CN 202010850484A CN 112177752 A CN112177752 A CN 112177752A
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management module
thermal management
engine
control strategy
water temperature
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CN112177752B (en
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熊迪
张丽珠
查乃敏
向高
欧阳丹
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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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
    • 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
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/14—Safety means against, or active at, failure of coolant-pumps drives, e.g. shutting engine down; Means for indicating functioning of coolant pumps
    • 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
    • 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
    • F01P2050/00—Applications
    • F01P2050/22—Motor-cars

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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 application discloses a control method and a control system of an engine heat management module, and relates to the technical field of control of engine cooling systems, wherein the control method comprises the following steps: constructing a cavitation control strategy model and an economic control strategy model, wherein the parameters of the cavitation control strategy model comprise the rotating speed and the water temperature of the engine and the opening of a thermal management module, and the parameters of the economic control strategy model comprise the rotating speed and the water temperature of the engine; synchronously acquiring the rotating speed and the water temperature of the engine and the opening of the thermal management module at continuous intervals; determining that the thermal management module adopts a cavitation control strategy or an economic control strategy according to the acquired rotating speed and water temperature to obtain a target opening amount of the thermal management module; and controlling the opening of the thermal management module according to the obtained target opening amount. This application judges whether the thermal management module adopts the cavitation control strategy according to the rotational speed and the temperature of engine, can effectively reduce the water pump cavitation risk of engine, increases the reliability of engine.

Description

Control method and control system of engine thermal management module
Technical Field
The application relates to the technical field of control of engine cooling systems, in particular to a control method and a control system of an engine thermal management module.
Background
The automobile engine gradually uses the thermal management module to replace a traditional thermostat to control the flow speed of the cooling liquid of the circulating branch of the engine cooling system so as to realize temperature control and achieve better oil consumption and emission effects.
The thermostat is limited by the working principle, and when the temperature of an engine cooling system is low, the small circulation is fully opened, and the large circulation is fully closed; when the temperature of the engine cooling system rises, the opening degree of the small circulation is reduced, and the opening degree of the large circulation is increased until the small circulation is completely closed and the large circulation is completely opened. The opening of the valve is controlled by the motor of the heat management module, and the opening adjustment of 0-100% can be realized in a small cycle under the condition that a large cycle is completely closed. Before the engine reaches the ideal working temperature (generally 90-105 ℃), especially at the stage of low rotating speed and low water temperature, the small circulation is controlled by small opening or even zero opening, so that the heat loss of the engine caused by the flowing of the cooling liquid can be effectively reduced, the engine is quickly warmed up, and the oil consumption and the emission are reduced.
However, in the actual vehicle using process of a user, there are no hot vehicle links, the engine is directly accelerated to be driven violently after being ignited, the water temperature of the engine at this stage does not reach the ideal working temperature, the thermal management module still controls the small circulation to be in a small opening degree or even a zero opening degree, so that the front pressure of the water pump is rapidly reduced, cavitation is easily caused, and if the front pressure of the water pump is in a small opening degree or even a zero opening degree, irreversible damage is caused to the water pump and a cylinder body for a long time, and the reliability and the durability of the engine.
In the related art, when the water temperature of the engine is low, the control of the thermal management module is generally to control the valve of the thermal management module to be in a smaller opening degree according to the ambient temperature and the water temperature of the engine. Although the control mode can reduce the flow of cooling liquid in the engine body and the radiator to reduce heat dissipation and increase the warming-up speed, the opening of the valve of the thermal management module is small, negative pressure is generated in front of the water pump to generate cavitation under the condition of rapid acceleration of the engine, the reliability of the engine is not facilitated, and particularly in winter or high-latitude areas, the reliability risk of cavitation of the engine is greatly increased.
Disclosure of Invention
The embodiment of the application provides a control method and a control system of an engine heat management module, whether the heat management module adopts a cavitation control strategy is judged according to the rotating speed and the water temperature of an engine, the risk of cavitation of a water pump of the engine can be effectively reduced, and the reliability of the engine is improved.
In one aspect, an embodiment of the present application provides a control method of an engine thermal management module, where the control method includes:
constructing a cavitation control strategy model and an economic control strategy model, wherein the parameters of the cavitation control strategy model comprise the rotating speed and the water temperature of the engine and the opening of the thermal management module, and the parameters of the economic control strategy model comprise the rotating speed and the water temperature of the engine;
synchronously acquiring the rotating speed and the water temperature of the engine and the opening of the thermal management module at continuous intervals;
determining that the thermal management module adopts a cavitation control strategy or an economic control strategy according to the acquired rotating speed and water temperature to obtain a target opening amount of the thermal management module;
and controlling the opening of the thermal management module according to the obtained target opening amount.
In the embodiment of the present application, preferably, the specific steps of constructing the cavitation control strategy model include:
calculating the change rate of the rotating speed of the engine according to a plurality of sequentially acquired rotating speeds;
calculating the water temperature change rate of the engine according to a plurality of sequentially acquired water temperatures;
calculating to obtain an opening adjustment coefficient of the thermal management module according to the obtained rotating speed change rate and the water temperature change rate;
and obtaining the current opening of the thermal management module, and obtaining the target opening amount of the thermal management module according to the obtained opening adjustment coefficient and a preset opening control reference.
Preferably, the specific step of calculating the opening adjustment coefficient of the thermal management module according to the obtained rotation speed change rate and the obtained water temperature change rate is:
and dividing the obtained rotation speed change rate by the obtained water temperature change rate to obtain an opening degree adjustment coefficient of the thermal management module.
Preferably, the preset opening degree control reference is calculated by the following method:
obtaining the lowest cold working temperature t of the enginemin；
Synchronous control of the engine speed from the lowest stable operating speed NminUniformly accelerated to the highest stable running rotating speed NmaxTorque of engine from lowest stable operation torque TminUniformly increased to the maximum steady operation torque TmaxUniformly increasing the opening degree of the thermal management module from the minimum opening degree to the maximum opening degree;
recording the rotating speed N of the engine at the highest stable operation rotating speedmaxTorque is the highest stable running torque TmaxAnd the water temperature t of the thermal management module when the opening degree is the maximum opening degreemax；
The water temperature t is measuredmaxAnd the minimum cold working temperature tminIs divided by the maximum steady operation speed NmaxAnd the lowest stable operation rotating speed NminAnd obtaining the opening control reference of the thermal management module.
Preferably, the specific steps of constructing the economic control strategy model are as follows:
acquiring the rotating speed and the water temperature of the engine, and inquiring the corresponding target water temperature according to a preset engine target water temperature map;
and acquiring and outputting the target opening amount of the thermal management module by adopting PID control according to the acquired water temperature and the inquired target water temperature.
Preferably, a target opening amount of the thermal management module is acquired and output by adopting PID closed-loop control according to a difference value between the acquired water temperature and the inquired target water temperature.
Preferably, the specific step of determining that the thermal management module adopts a cavitation control strategy or an economic control strategy includes:
and when the rotating speeds are continuously increased, the increment of the maximum rotating speed and the minimum rotating speed is larger than a preset threshold value, and the water temperatures are continuously increased, the thermal management module adopts a cavitation control strategy, otherwise, the thermal management module adopts an economic control strategy.
Preferably, when the plurality of rotation speeds are continuously increased, the increment between the maximum rotation speed and the minimum rotation speed is greater than a preset threshold, and the plurality of water temperatures are continuously increased, the thermal management module adopts a cavitation control strategy, otherwise, the specific step of the thermal management module adopting an economy control strategy is as follows:
judging whether the multiple rotating speeds are continuously increased or not according to the multiple rotating speeds and the multiple water temperatures which are sequentially obtained;
if the rotating speeds are discontinuously increased, the thermal management module adopts an economic control strategy;
if the rotating speeds are continuously increased, judging whether the increment of the maximum rotating speed and the minimum rotating speed in the rotating speeds is larger than a preset threshold value or not;
if the increment of the maximum rotating speed and the minimum rotating speed is not larger than a preset threshold value, the thermal management module adopts an economic control strategy;
if the increment of the maximum rotating speed and the minimum rotating speed is larger than a preset threshold value, judging whether the water temperatures are continuously increased;
and if the water temperatures are continuously increased, the thermal management module adopts a cavitation control strategy, otherwise, the thermal management module adopts an economic control strategy.
Preferably, after the thermal management module adopts the cavitation control strategy, the control method further comprises:
and judging whether the continuously acquired multiple rotating speeds are continuously increased, if so, continuing to adopt a cavitation control strategy by the thermal management module, and otherwise, adopting an economic control strategy by the thermal management module.
In another aspect, an embodiment of the present application further provides a control system of an engine thermal management module, where the control system includes:
a rotational speed sensor for acquiring a rotational speed of the engine at continuous intervals;
a temperature sensor for acquiring water temperature of the engine at continuous intervals;
the thermal management module is used for acquiring the opening degree of the thermal management module at continuous intervals;
a memory for storing a cavitation control strategy model and an economy control strategy model, parameters of the cavitation control strategy model including a rotational speed of the engine, a water temperature, and an opening of the thermal management module, and parameters of the economy control strategy model including a rotational speed of the engine, a water temperature;
the processor is used for determining that the thermal management module adopts a cavitation control strategy or an economic control strategy according to the acquired rotating speed and water temperature to obtain a target opening amount of the thermal management module;
and the controller is used for controlling the opening of the thermal management module according to the obtained target opening amount.
The beneficial effect that technical scheme that this application provided brought includes:
(1) the embodiment of the application provides a control method and a control system of an engine heat management module, which can identify the risk of cavitation generated by an engine according to the rotating speed and the water temperature of the engine in the running process of a whole vehicle, judge that the heat management module adopts a cavitation control strategy or an economic control strategy to control the opening of the heat management module, keep the front pressure of a water pump above the critical cavitation pressure, and prevent the front pressure of the water pump from being too low to cause cavitation. Therefore, the method and the device can effectively reduce the risk of cavitation of the water pump of the engine and increase the reliability of the engine.
(2) In this embodiment, the ratio of the change rate of the rotation speed of the engine to the change rate of the water temperature is used as an opening adjustment coefficient for controlling the opening of the thermal management module, so that the rotation speed and the water temperature of key parameters influencing the cavitation performance of the water pump can be combined, the change of the working condition of the engine relative to a reference working condition is accurately reflected, and the opening of the thermal management module is synchronously controlled.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for controlling an engine thermal management module according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart illustrating a method for controlling a cavitation control strategy according to an embodiment of the present application;
FIG. 3 is a flow chart illustrating a method of controlling an economic control strategy in an embodiment of the present application;
FIG. 4 is a detailed schematic flow chart of a method for controlling an engine thermal management module according to an embodiment of the present disclosure;
fig. 5 is a specific flowchart of a control method of the economic control strategy in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an embodiment of the present application provides a control method of an engine thermal management module, including:
step S1: constructing a cavitation control strategy model and an economic control strategy model, wherein the parameters of the cavitation control strategy model comprise the rotating speed and the water temperature of the engine and the opening of the thermal management module, and the parameters of the economic control strategy model comprise the rotating speed and the water temperature of the engine;
step S2: synchronously acquiring the rotating speed and the water temperature of the engine and the opening of the thermal management module at continuous intervals;
step S3: determining that the thermal management module adopts a cavitation control strategy or an economic control strategy according to the acquired rotating speed and water temperature to obtain a target opening amount of the thermal management module;
step S4: and controlling the opening of the thermal management module according to the obtained target opening amount.
In the embodiment of the application, the risk of cavitation generated by the engine is identified according to the rotating speed and the water temperature of the engine, so that whether the cavitation control strategy or the economic control strategy is adopted by the thermal management module is determined, the target opening degree of the thermal management module is obtained, and the opening degree of the thermal management module is controlled. This application can be at the whole operation in-process of vehicle, and the rotational speed of real-time supervision engine, temperature come to adopt suitable control strategy, reduce the cavitation risk of the water pump of engine, improve the reliability of engine.
As shown in fig. 2, further, the specific steps of constructing the cavitation control strategy model include:
step S101: calculating the change rate of the rotating speed of the engine according to a plurality of sequentially acquired rotating speeds;
step S102: calculating the water temperature change rate of the engine according to a plurality of sequentially acquired water temperatures;
step S103: calculating to obtain an opening adjustment coefficient of the thermal management module according to the obtained rotating speed change rate and the water temperature change rate;
step S104: and obtaining the current opening of the thermal management module, and obtaining a target opening degree of the thermal management module according to the obtained opening degree adjustment coefficient and a preset opening degree control reference, wherein the target opening degree is equal to the product of the current opening degree, the opening degree adjustment coefficient and the opening degree control reference.
Further, the specific steps of step S103 are:
and dividing the obtained rotation speed change rate by the obtained water temperature change rate to obtain an opening degree adjustment coefficient of the thermal management module.
In this embodiment, the ratio of the change rate of the rotation speed of the engine to the change rate of the water temperature is used as an opening adjustment coefficient for controlling the opening of the thermal management module, so that the rotation speed and the water temperature of key parameters influencing the cavitation performance of the water pump can be combined, the change of the working condition of the engine relative to a reference working condition is accurately reflected, and the opening of the thermal management module is synchronously controlled.
Further, the preset opening degree control reference is calculated by the following method:
obtaining the lowest cold working temperature t of the enginemin；
Synchronous control of the engine speed from the lowest stable operating speed NminUniformly accelerated to the highest stable running rotating speed NmaxTorque of engine from lowest stable operation torque TminUniformly increased to the maximum steady operation torque TmaxUniformly increasing the opening degree of the thermal management module from the minimum opening degree to the maximum opening degree;
recording the rotating speed N of the engine at the highest stable operation rotating speedmaxTorque is the highest stable running torque TmaxAnd the water temperature t of the thermal management module when the opening degree is the maximum opening degreemax；
The water temperature t is measuredmaxAnd the minimum cold working temperature tminIs divided by the maximum steady operation speed NmaxAnd the lowest stable operation rotating speed NminAnd obtaining the opening control reference of the thermal management module.
As shown in fig. 3, further, the specific steps of constructing the economy control strategy model are as follows:
step N101: acquiring the rotating speed and the water temperature of the engine, and inquiring the corresponding target water temperature according to a preset engine target water temperature map;
step N102: and acquiring and outputting the target opening amount of the thermal management module by adopting PID control according to the acquired water temperature and the inquired target water temperature.
Furthermore, according to the difference value between the acquired water temperature and the inquired target water temperature, the PID closed-loop control is adopted to acquire and output the target opening amount of the thermal management module.
When the thermal management module executes the economic control strategy, if the difference value between the water temperature and the target water temperature is larger than a preset upper limit temperature difference, the opening degree of the thermal management module is increased by adopting PID control;
if the difference value between the water temperature and the target water temperature is smaller than a preset lower limit temperature difference, reducing the opening of the thermal management module by adopting PID control;
and if the difference value between the water temperature and the target water temperature is between the upper limit temperature difference and the lower limit temperature difference, controlling the opening of the thermal management module to be unchanged by adopting PID.
Specifically, the upper limit temperature difference is 2, and the lower limit temperature difference is-2. In the embodiment of the application, when the water temperature is lower than the target water temperature minus 2, the temperature is too low, the cavitation risk of the water pump is low, the opening degree of the heat management module is reduced by adopting PID control, the water temperature of the engine can be properly increased, and the running performance of the engine is improved; when the water temperature is higher than the target water temperature plus 2, the temperature is too high, the cavitation risk of the water pump is high at the moment, the opening degree of the heat management module is increased by adopting PID control, the front pressure of the water pump is also increased, so that the front pressure of the water pump is kept above the critical cavitation pressure, and the cavitation caused by too low front pressure of the water pump is prevented.
Further, in step S3, the specific step of determining that the thermal management module adopts the cavitation control strategy or the economic control strategy includes:
and when the rotating speeds are continuously increased, the increment of the maximum rotating speed and the minimum rotating speed is larger than a preset threshold value, and the water temperatures are continuously increased, the thermal management module adopts a cavitation control strategy, otherwise, the thermal management module adopts an economic control strategy.
Specifically, the specific step of step S3 is:
judging whether the multiple rotating speeds are continuously increased or not according to the multiple rotating speeds and the multiple water temperatures which are sequentially obtained;
if the rotating speeds are discontinuously increased, the thermal management module adopts an economic control strategy;
if the rotating speeds are continuously increased, judging whether the increment of the maximum rotating speed and the minimum rotating speed in the rotating speeds is larger than a preset threshold value or not; wherein the threshold is the maximum pull-up rate of the engine speed (the engine rotates from the lowest stable operation speed N)minIs pulled up to the highest stable operation rotating speed N at the fastest speedmaxSpeed change rate) and the duration of the speed ramp-up (the specific value is determined by calibration for different vehicles).
If the increment of the maximum rotating speed and the minimum rotating speed is not larger than a preset threshold value, the thermal management module adopts an economic control strategy;
if the increment of the maximum rotating speed and the minimum rotating speed is larger than a preset threshold value, judging whether the water temperatures are continuously increased;
and if the water temperatures are continuously increased, the thermal management module adopts a cavitation control strategy, otherwise, the thermal management module adopts an economic control strategy.
Still further, after the thermal management module employs the cavitation control strategy, the control method further comprises:
and judging whether the continuously acquired multiple rotating speeds are continuously increased, if so, continuing to adopt a cavitation control strategy by the thermal management module, and otherwise, adopting an economic control strategy by the thermal management module.
When the heat management module adopts an economic control strategy, the rotating speed and the water temperature of the engine are continuously obtained, so that the cavitation risk of the water pump is identified in the whole running process of the vehicle, the cavitation risk of the water pump of the engine is reduced, and the reliability of the engine is improved.
As shown in fig. 4, an embodiment of the present application specifically provides a control method for an engine thermal management module, which specifically includes the following steps:
step S001: starting the engine, and going to step S002;
step S002: continuously and intermittently acquiring the rotating speed of the engine by using an engine rotating speed sensor, continuously and intermittently acquiring the water temperature of the engine by using an engine water temperature sensor, and acquiring the opening degree of a thermal management module by using the thermal management module, wherein the rotating speed, the water temperature and the opening degree are synchronously acquired, and the step is turned to S003;
step S003: judging whether the three rotating speeds are continuously increased or not according to the three sequentially acquired rotating speeds, if so, turning to a step S004, otherwise, confirming that the engine is in an emergency acceleration working condition, and turning to the step S005;
step S004: judging whether the increment of the maximum rotating speed and the minimum rotating speed in the three rotating speeds is larger than a preset threshold value, if so, turning to the step S006, otherwise, determining that the rotating speed variation amplitude is small, and turning to the step S005;
step S005: the controller of the engine controls the thermal management module to adopt an economic control strategy according to a preset economic control strategy model;
step S006: judging whether the three water temperatures are continuously increased or not according to the three sequentially acquired water temperatures, if so, confirming that the engine is in an emergency acceleration working condition and a large cavitation risk exists, and turning to the step S007, otherwise, turning to the step S005;
step S007: the controller of the engine controls the thermal management module to adopt a cavitation control strategy according to a preset cavitation control strategy model, and the step is switched to the step S008;
step S008: continuously acquiring three rotating speeds of the engine at intervals, and turning to the step S009;
step S009: and judging whether the three rotating speeds obtained in the step S008 continuously increase, if so, turning to the step S007, and otherwise, turning to the step S005.
According to the embodiment of the application, in the whole operation process of a vehicle, the risk that the engine generates cavitation is identified according to the working condition of the engine and the rotating speed and the water temperature of the engine, the opening of the thermal management module is controlled by the judgment thermal management module by adopting a cavitation control strategy or an economic control strategy, when the engine is in a rapid acceleration working condition, the opening of the thermal management module is controlled to be rapidly increased by adopting the cavitation control strategy, the flow of cooling liquid in front of a water pump is increased, the front pressure of the water pump is kept above the critical cavitation pressure, and cavitation caused by rapid reduction of the front pressure of the water pump is avoided. Therefore, the method and the device can effectively reduce the risk of cavitation of the water pump of the engine and increase the reliability of the engine.
As a new preferable solution of the embodiment of the present application, the method for controlling the economic control strategy includes the steps of:
m1: acquiring the rotating speed and the water temperature of the engine, and inquiring the corresponding target water temperature according to a preset engine target water temperature map;
m2: calculating the temperature difference between the target water temperature and the current water temperature according to the acquired water temperature and the inquired target water temperature;
m3: and judging whether the temperature difference is smaller than a preset boundary temperature, if so, executing M4 when the engine is in cold start, and otherwise, executing M5 after the engine is in cold start.
M4: interval control obtains and opens a target opening amount to the thermal management module;
m5: and acquiring and opening a target opening amount to the thermal management module by adopting PID control.
The operation working condition of the engine is truly reflected by combining the rotating speed and the water temperature of the engine, so that whether the engine is in cold machine starting or after the cold machine starting is finished is distinguished, and corresponding operation working conditions, namely opening control of the corresponding heat management module is carried out during the cold machine starting and after the cold machine starting is finished; when the engine is started in a cold state, the water temperature (coolant temperature) of the engine is much lower than the inquired target temperature, so that the heat management module can be in a closed state for a long time at this stage, the flow of coolant in the engine is greatly reduced, and the temperature rise speed of the coolant is improved; meanwhile, the thermal management modules are opened at intervals, so that the uniformity of the temperature of the cooling liquid in the water jacket of the engine can be guaranteed, the friction in the cylinder can be reduced, the oil consumption is reduced, and the economical efficiency of the engine is improved; after the cold machine of the engine is started, the PID is adopted to dynamically adjust the opening of the thermal management module, the response is fast, and the water temperature of the engine can be stably controlled, so that the fluctuation of the water temperature is small, the oil consumption is further reduced, and the economical efficiency of the engine is improved.
Preferably, the value range of the boundary temperature is 35-45 ℃. In this embodiment, the boundary temperature takes a value of 40 ℃, which is a switching boundary between when the engine is in cold start and after the cold start is finished, and an actual value is obtained empirically.
Referring to fig. 5, specifically, the method for controlling the economic control strategy specifically includes:
m1: acquiring the rotating speed and the water temperature of the engine, inquiring the corresponding target water temperature according to a preset engine target water temperature map, and switching to M2;
m2: calculating the temperature difference between the target water temperature and the current water temperature according to the acquired water temperature and the inquired target water temperature, and switching to M3;
m3: judging whether the temperature difference is smaller than a preset boundary temperature, if so, executing M401, otherwise, executing M5;
m401: controlling the thermal management module to close, and turning to M402;
m402: acquiring the rotating speed and the torque of the engine, calculating to obtain the power of the engine, and switching to M403;
m403: calculating a target opening amount of the thermal management module according to the rated power of the engine and the obtained power, and switching to M404;
m404: multiplying the current temperature difference by the product of preset basic control time, dividing the product by the boundary temperature to obtain the interval time of the thermal management module, and turning to M405;
m405: controlling the thermal management module to be opened to the target opening amount according to the determined interval time, continuing until the engine is judged to be in cold start at the next time or after the cold start is finished, and switching to N3;
m5: and acquiring and opening a target opening amount to the thermal management module by adopting PID closed-loop control.
The PID closed-loop control in step M5 is the same as the PID closed-loop control, and is not described herein again.
In this embodiment, when the engine is started in a cold state, the water temperature of the engine is relatively low, but the target water temperature is relatively high, and the target water temperature is generally 90 ℃ to 105 ℃, so that the opening degree of the thermal management module is controlled to be 0%, that is, the thermal management module is closed, the flow of the coolant in the engine can be reduced to the greatest extent, and the temperature rise speed of the coolant can be increased; however, the temperature uniformity of the coolant in the water jacket of the engine is poor, so that the temperature uniformity of the coolant in the water jacket of the engine can be guaranteed by opening the thermal management module at intervals, the in-cylinder friction is reduced, the oil consumption is reduced, and the economical efficiency of the engine is improved.
Specifically, a target opening value of the thermal management module
Figure BDA0002644558050000131
Wherein α is the target opening value, PiIs the power of the engine, P0Is the rated power of the engine. Meanwhile, after the opening degree of the heat management module is opened to alpha, the opening degree is maintained for two seconds, and the temperature uniformity of the cooling liquid in the water jacket of the engine can be effectively guaranteed.
More specifically, the specific steps of step M404 are:
and multiplying the current temperature difference by the product of the preset basic control time, and dividing the product by the boundary temperature to obtain the interval time of the thermal management module.
Furthermore, the value range of the basic control time is 5 s-30 s. The basic control time can be taken within 5 s-30 s according to different engines, wherein the specific value is obtained empirically, and in the embodiment of the application, the basic control time is taken as 15 s.
It can be seen that the interval time of the thermal management module in the embodiment of the present application
Figure BDA0002644558050000141
In the formula, T is interval time, and Δ T is the current temperature difference.
Therefore, the economy control strategy in the embodiment of the application adopts a new economy control strategy, and when the engine is started by a cold machine, the reduction of in-cylinder friction is facilitated, so that the oil consumption is reduced, and the economy of the engine is improved.
An embodiment of the present application further provides a control system of an engine thermal management module, where the control system includes:
a rotational speed sensor for acquiring a rotational speed of the engine at continuous intervals;
a temperature sensor for acquiring water temperature of the engine at continuous intervals;
the thermal management module is used for acquiring the opening degree of the thermal management module at continuous intervals;
a memory for storing a cavitation control strategy model and an economy control strategy model, parameters of the cavitation control strategy model including a rotational speed of the engine, a water temperature, and an opening of the thermal management module, and parameters of the economy control strategy model including a rotational speed of the engine, a water temperature;
the processor is used for determining that the thermal management module adopts a cavitation control strategy or an economic control strategy according to the acquired rotating speed and water temperature to obtain a target opening amount of the thermal management module;
and the controller is used for controlling the opening of the thermal management module according to the obtained target opening amount.
The specific embodiment of the control system of the engine thermal management module provided in the embodiment of the present application has been described in the specific embodiment of the control method, and therefore, description thereof is omitted.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A control method of an engine thermal management module, the control method comprising:
constructing a cavitation control strategy model and an economic control strategy model, wherein the parameters of the cavitation control strategy model comprise the rotating speed and the water temperature of the engine and the opening of the thermal management module, and the parameters of the economic control strategy model comprise the rotating speed and the water temperature of the engine;
synchronously acquiring the rotating speed and the water temperature of the engine and the opening of the thermal management module at continuous intervals;
determining that the thermal management module adopts a cavitation control strategy or an economic control strategy according to the acquired rotating speed and water temperature to obtain a target opening amount of the thermal management module;
and controlling the opening of the thermal management module according to the obtained target opening amount.
2. The method of controlling an engine thermal management module of claim 1, wherein the step of constructing the cavitation control strategy model comprises:
calculating the change rate of the rotating speed of the engine according to a plurality of sequentially acquired rotating speeds;
calculating the water temperature change rate of the engine according to a plurality of sequentially acquired water temperatures;
calculating to obtain an opening adjustment coefficient of the thermal management module according to the obtained rotating speed change rate and the water temperature change rate;
and obtaining the current opening of the thermal management module, and obtaining the target opening amount of the thermal management module according to the obtained opening adjustment coefficient and a preset opening control reference.
3. The method for controlling the thermal management module of the engine according to claim 2, wherein the step of calculating the opening adjustment coefficient of the thermal management module according to the obtained rotation speed change rate and the obtained water temperature change rate comprises the following steps:
and dividing the obtained rotation speed change rate by the obtained water temperature change rate to obtain an opening degree adjustment coefficient of the thermal management module.
4. The method of controlling an engine thermal management module according to claim 2, wherein the preset opening control reference is calculated by:
obtaining the lowest cold working temperature t of the enginemin；
Synchronous control of the engine speed from the lowest stable operating speed NminUniformly accelerated to the highest stable running rotating speed NmaxTorque of engine from lowest stable operation torque TminUniformly increased to the maximum steady operation torque TmaxUniformly increasing the opening degree of the thermal management module from the minimum opening degree to the maximum opening degree;
recording the rotating speed N of the engine at the highest stable operation rotating speedmaxTorque is the highest stable running torque TmaxAnd the water temperature t of the thermal management module when the opening degree is the maximum opening degreemax；
The water temperature t is measuredmaxAnd the minimum cold working temperature tminIs divided by the maximum steady operation speed NmaxAnd the lowest stable operation rotating speed NminAnd obtaining the opening control reference of the thermal management module.
5. The control method of an engine thermal management module according to claim 1, wherein the specific step of constructing the economy control strategy model is:
acquiring the rotating speed and the water temperature of the engine, and inquiring the corresponding target water temperature according to a preset engine target water temperature map;
and acquiring and outputting the target opening amount of the thermal management module by adopting PID control according to the acquired water temperature and the inquired target water temperature.
6. The method of controlling an engine thermal management module of claim 5, wherein the target amount of opening of the thermal management module is obtained and output using PID closed-loop control based on a difference between the obtained water temperature and the queried target water temperature.
7. The method of controlling an engine thermal management module of claim 1, wherein the step of determining whether the thermal management module employs a cavitation control strategy or an economy control strategy comprises:
and when the rotating speeds are continuously increased, the increment of the maximum rotating speed and the minimum rotating speed is larger than a preset threshold value, and the water temperatures are continuously increased, the thermal management module adopts a cavitation control strategy, otherwise, the thermal management module adopts an economic control strategy.
8. The method of controlling an engine thermal management module according to claim 7, wherein the thermal management module employs a cavitation control strategy when the plurality of rotational speeds are continuously increased, the increment between the maximum rotational speed and the minimum rotational speed is greater than a preset threshold, and the plurality of water temperatures are continuously increased, otherwise the thermal management module employs an economy control strategy comprising the steps of:
judging whether the multiple rotating speeds are continuously increased or not according to the multiple rotating speeds and the multiple water temperatures which are sequentially obtained;
if the rotating speeds are discontinuously increased, the thermal management module adopts an economic control strategy;
if the rotating speeds are continuously increased, judging whether the increment of the maximum rotating speed and the minimum rotating speed in the rotating speeds is larger than a preset threshold value or not;
if the increment of the maximum rotating speed and the minimum rotating speed is not larger than a preset threshold value, the thermal management module adopts an economic control strategy;
if the increment of the maximum rotating speed and the minimum rotating speed is larger than a preset threshold value, judging whether the water temperatures are continuously increased;
and if the water temperatures are continuously increased, the thermal management module adopts a cavitation control strategy, otherwise, the thermal management module adopts an economic control strategy.
9. The method of controlling an engine thermal management module of claim 8, after the thermal management module employs a cavitation control strategy, the method further comprising:
and judging whether the continuously acquired multiple rotating speeds are continuously increased, if so, continuing to adopt a cavitation control strategy by the thermal management module, and otherwise, adopting an economic control strategy by the thermal management module.
10. A control system for an engine thermal management module, the control system comprising:
a rotational speed sensor for acquiring a rotational speed of the engine at continuous intervals;
a temperature sensor for acquiring water temperature of the engine at continuous intervals;
the thermal management module is used for acquiring the opening degree of the thermal management module at continuous intervals;
a memory for storing a cavitation control strategy model and an economy control strategy model, parameters of the cavitation control strategy model including a rotational speed of the engine, a water temperature, and an opening of the thermal management module, and parameters of the economy control strategy model including a rotational speed of the engine, a water temperature;
the processor is used for determining that the thermal management module adopts a cavitation control strategy or an economic control strategy according to the acquired rotating speed and water temperature to obtain a target opening amount of the thermal management module;
and the controller is used for controlling the opening of the thermal management module according to the obtained target opening amount.
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