CN114738101B - Engine electronic water pump control method and device - Google Patents

Engine electronic water pump control method and device Download PDF

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Publication number
CN114738101B
CN114738101B CN202110017802.3A CN202110017802A CN114738101B CN 114738101 B CN114738101 B CN 114738101B CN 202110017802 A CN202110017802 A CN 202110017802A CN 114738101 B CN114738101 B CN 114738101B
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temperature
rotating speed
engine
water pump
real
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CN114738101A (en
Inventor
林承伯
刘强
高媛媛
丘胜强
何炎迎
吴广权
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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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
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • 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
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • 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
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/027—Cooling cylinders and cylinder heads in parallel
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses a control method and a device for an electronic water pump of an engine, wherein the method comprises the following steps: determining a real-time water temperature of an engine in a vehicle, determining a control mode of an electronic water pump according to the real-time water temperature, acquiring a real-time rotating speed and a real-time load of the engine if the control mode of the electronic water pump is determined to be an open-loop control mode, determining whether the engine has overheat risk according to the real-time water temperature and the real-time load, inquiring a first rotating speed corresponding to the real-time rotating speed and the real-time load in first preset data if the engine does not have overheat risk, taking the first rotating speed as a target rotating speed of the electronic water pump, and controlling the electronic water pump according to the target rotating speed; according to the invention, on the premise that the engine is not overheated, the rotating speed of the electronic water pump is accurately set based on the first preset data, and the water temperature of the engine is set at the optimal level of the steady-state working condition of the engine, so that the cooling on demand is realized, and the real-time requirement of the engine is met.

Description

Engine electronic water pump control method and device
Technical Field
The invention relates to the technical field of engine cooling, in particular to an electronic water pump control method and device for an engine.
Background
In the engine cooling system, the temperature control module cools the engine through the motor driving ball valve, and the temperature control module is arranged at the water outlet of the engine and can simultaneously control a plurality of branches, wherein the branches comprise a plurality of branches such as small circulation, a radiator, warm air and the like. The opening of the temperature control module has close relation with the control of the coolant flow, and the opening of the temperature control module can be controlled to control the opening of the branch so as to realize different control effects.
However, in the existing engine cooling system, a unique water temperature sensor (the temperature of the engine cylinder cover is highest) is generally arranged at the water outlet of the engine cylinder cover so as to detect the water temperature of the engine under different working conditions, and then the opening degree of a temperature control module (ball valve) is controlled based on the water temperature measured by the water temperature sensor, and the higher the water temperature measured by the water temperature sensor on the cylinder cover is, the larger the opening degree of the temperature control module is. In the running process of the vehicle, the working condition of the engine changes more frequently and rapidly, and because of the position relation between the water temperature sensor and the temperature control module, after the temperature control module is controlled, the influence of the temperature control module on the flow of the cooling liquid needs to be circulated once and can be reflected through the water temperature sensor at the water outlet of the cylinder cover, the response of the temperature control module and the water temperature response of the engine are delayed, so that the water temperature of the engine can not meet the actual requirement of the engine rapidly, and the condition that the engine is supercooled or overheated easily occurs.
Disclosure of Invention
The invention provides a control method and a device for an electronic water pump of an engine, which are used for solving the problem that the actual requirement of the engine cannot be met due to the fact that the control of the water temperature of the engine is not accurate enough in the prior art.
An electronic water pump control method of an engine, comprising:
determining the real-time water temperature of an engine in a vehicle, and determining a control mode of an electronic water pump according to the real-time water temperature;
if the control mode of the electronic water pump is determined to be an open loop control mode, acquiring the real-time rotating speed and the real-time load of the engine;
determining whether the engine is at risk of overheating according to the real-time water temperature and the real-time load;
if the engine is determined to have no overheat risk, inquiring a first rotating speed corresponding to the real-time rotating speed and the real-time load in first preset data, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data is rotating speed data calibrated under a steady-state working condition of the engine of the electronic water pump;
and controlling the electronic water pump according to the target rotating speed.
An electronic water pump control device for an engine, comprising:
the first determining module is used for determining the real-time water temperature of an engine in the vehicle and determining the control mode of the electronic water pump according to the real-time water temperature;
The acquisition module is used for acquiring the real-time rotating speed and the real-time load of the engine if the control mode of the electronic water pump is determined to be an open-loop control mode;
the second determining module is used for determining whether the engine has overheat risk according to the real-time water temperature and the real-time load;
the inquiring module is used for inquiring the real-time rotating speed and the first rotating speed corresponding to the real-time load in first preset data and taking the first rotating speed as the target rotating speed of the electronic water pump if the engine is determined to have no overheat risk, wherein the first preset data is the rotating speed data calibrated under the steady-state working condition of the engine of the electronic water pump;
and the control module is used for controlling the electronic water pump according to the target rotating speed.
An electronic water pump control for an engine, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the steps of the electronic water pump method for the engine are realized when the processor executes the computer program.
A readable storage medium storing a computer program which when executed by a processor performs the steps of the engine electronic water pump method described above.
In one scheme provided by the method and the device for controlling the electronic water pump of the engine, the real-time water temperature of the engine in the vehicle is determined, the control mode of the electronic water pump is determined according to the real-time water temperature, if the control mode of the electronic water pump is determined to be an open-loop control mode, the real-time rotating speed and the real-time load of the engine are obtained, whether the engine has overheat risk or not is determined according to the real-time water temperature and the real-time load, if the engine does not have overheat risk, the first rotating speed corresponding to the real-time rotating speed and the real-time load is inquired in first preset data, the first rotating speed is used as the target rotating speed of the electronic water pump, the first preset data is the rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine, and the electronic water pump is controlled according to the target rotating speed; according to the invention, in the running process of the vehicle, on the premise of ensuring that the water temperature of the engine is not overheated, the rotating speed of the electronic water pump is accurately set based on the first preset data, the water temperature of the engine can be set at the optimal level of the steady-state working condition of the engine, and on the premise of meeting the reliability of the water temperature of the engine, the cooling flow is controlled as required, so that the real-time requirement of the engine is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an engine cooling apparatus according to an embodiment of the present invention;
FIG. 2 is a flow chart of an electronic water pump control method of an engine according to an embodiment of the invention;
FIG. 3 is a schematic flow chart of an electronic water pump control method of an engine according to an embodiment of the invention;
FIG. 4 is a schematic diagram of an electronic water pump control device for an engine according to an embodiment of the present invention;
fig. 5 is a schematic diagram of another structure of an electronic water pump control of an engine according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The engine electronic water pump control method provided by the embodiment of the invention can be applied to a vehicle cooling system, and the vehicle cooling system comprises an engine cooling device and an engine electronic water pump control device. The engine electronic water pump control device may be an engine management system (Engine Management System, EMS), and the engine cooling device and the EMS may communicate through a bus, wherein, as shown in fig. 1, the engine cooling device includes an electronic water pump, an engine (including a cylinder head and a cylinder body), a temperature control element (which may be a temperature control module or a thermostat), and a radiator branch (a large circulation branch) and a small circulation branch connected to the temperature control element, and an arrow direction shown in fig. 1 is a flow direction of the coolant. The electronic water pump is completely decoupled with the rotating speed of the engine by driving the impeller through the motor, and the current quantity can be controlled by the motor to carry out stepless regulation. The flow pumped by the electronic water pump is split into a cylinder cover and a cylinder body of the engine, the temperature control module can use the temperature control module in the form of an electric control ball valve, and the thermostat can be of a dual-wax-bag structure. The water temperature sensor is arranged on the engine to obtain the real-time water temperature of the engine, and then the rotating speed of the electronic water pump is controlled according to the real-time water temperature of the engine.
In an embodiment, a cylinder body and a cylinder cover of an engine are in a serial structure, a water temperature sensor is arranged at a water outlet of the cylinder cover to obtain real-time water temperature of the engine, after a vehicle is electrified, an EMS determines the real-time water temperature of the engine in the vehicle through the water temperature sensor, determines a control mode of an electronic water pump according to the real-time water temperature, if the control mode of the electronic water pump is determined to be an open-loop control mode, obtains real-time rotating speed and real-time load of the engine, determines whether the engine has overheat risk according to the real-time water temperature and the real-time load, if the engine does not have overheat risk, inquires first rotating speed corresponding to the real-time rotating speed and the real-time load in first preset data, takes the first rotating speed as target rotating speed of the electronic water pump, the first preset data is rotating speed data calibrated under an engine steady-state working condition, controls the electronic water pump according to the target rotating speed, accurately sets the rotating speed of the electronic water pump based on the two rotating speed data, and can set the engine water temperature at an optimal level under the engine steady-state working condition on the premise that the water temperature of the engine is ensured not overheat, and on-state flow control is realized on the premise that the reliability of the engine water temperature is met.
In other embodiments, the engine cooling device is based on the split-flow design of the engine cylinder body and the cylinder cover, the partition cooling of the cylinder body and the cylinder cover can be realized through the technologies of double thermostats or temperature control modules and the like, and on the basis of realizing the split-flow cooling, in order to ensure the heat damage risk of the cylinder body and the cylinder cover, water temperature sensors are required to be designed on the cylinder body and the cylinder cover so as to accurately control the water temperature of the engine, wherein as shown in fig. 1, the water temperature sensor on the engine can comprise a sensor 1 arranged at a water outlet of the cylinder cover and a sensor 2 arranged inside the cylinder body so as to respectively obtain the actual water temperatures on the engine cylinder cover and the engine cylinder body, and further, the rotation speeds of the electronic water pump are controlled at different stages through the actual water temperatures of different areas of the engine so as to further improve the accurate control of the water temperature of the engine.
In this embodiment, the vehicle cooling system includes an engine cooling device and an engine electronic water pump control device, the engine electronic water pump control device may be an engine management system, and specific devices of the engine cooling device are only illustrated by way of example, and in other embodiments, the engine electronic water pump control device may also be other control devices, and the engine cooling device and the vehicle cooling system may also include other devices, which are not described herein again.
In one embodiment, as shown in fig. 2, a method for controlling an electronic water pump of an engine is provided, and the method is applied to EMS for illustration, and includes the following steps:
s10: and determining the real-time water temperature of an engine in the vehicle, and determining the control mode of the electronic water pump according to the real-time water temperature.
After the vehicle is powered on, the EMS needs to determine the real-time water temperature of the engine in the vehicle and determine the control mode of the electronic water pump based on the real-time water temperature. The real-time water temperature in the embodiment may be a cylinder head water temperature at a water outlet of an engine cylinder head, obtained through a water temperature sensor arranged at the water outlet of the engine cylinder head, and after obtaining the cylinder body water temperature, judging a control mode of the electronic water pump according to a water temperature threshold preset by the cylinder body water temperature.
For example, after the real-time water temperature T is obtained, it is determined whether the real-time water temperature T is greater than the cold start threshold T c1 If the real-time water temperature T is smaller than or equal to the cold start threshold, the engine is required to enter a cold start mode to warm up the engine, and the control mode of the electronic water pump is determined to be a warm-up control mode; if the real-time water temperature T is greater than the cold start threshold, the engine does not need to enter the cold start mode, and the control mode is determined to be a normal working mode, namely an open loop control mode. Wherein the cold start threshold T c1 Setting a cold start threshold T to a preset value c1 When the temperature of the thermostat is required to be referred to and is determined by combining the actual test effect, the cold start threshold T can be generally calculated c1 Is set in the range of 70-90 ℃.
S20: if the control mode of the electronic water pump is determined to be an open loop control mode, the real-time rotating speed and the real-time load of the engine are obtained.
If the control mode of the electronic water pump is determined to be an open loop control mode according to the real-time water temperature of the engine, the real-time rotating speed and the real-time load of the engine are required to be obtained so as to control the rotating speed of the electronic water pump according to the real-time working condition of the engine.
S30: and determining whether the engine has overheat risk according to the real-time water temperature, the real-time load and second preset data, wherein the second preset data is electronic water pump rotating speed data determined after the overheat risk of the engine is evaluated according to different engine water temperatures and engine loads.
After the control mode of the electronic water pump is determined to be an open-loop control mode, second preset data are also required to be acquired, and whether the engine has overheat risk is determined in the second preset data according to the real-time water temperature and the real-time load. The second preset data are electronic water pump rotating speed data which are determined after the overheat risk of the engine is evaluated according to different engine water temperatures and engine loads, in the second preset data, the overheat risk of the engine under different engine water temperatures and engine loads is evaluated, the engine water temperatures and the engine loads are divided into a plurality of sections according to risk evaluation conditions, overheat risk evaluation conditions are corresponding to each section, and different electronic water pump rotating speed values are correspondingly set for different engine water temperatures and engine loads in each section.
S40: if the engine is determined to have no overheat risk, inquiring a first rotating speed corresponding to the real-time rotating speed and the real-time load in first preset data, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data is rotating speed data calibrated under a steady-state working condition of the engine of the electronic water pump.
If the fact that the engine does not have overheat risk is determined in second preset data according to the real-time water temperature and the real-time load, inquiring the first rotation speed corresponding to the real-time rotation speed and the real-time load in the first preset data, and taking the first rotation speed as a target rotation speed of the electronic water pump, wherein the first preset data are calibrated rotation speed data of the electronic water pump under a steady-state working condition of the engine. The method comprises the steps of inquiring first preset data based on the working condition of an engine to determine the rotating speed of the electronic water pump, and searching a lower rotating speed of the electronic water pump, which is obtained through calibration under a steady-state working condition of a bench test, so as to ensure that the rotating speed of the electronic water pump is reduced as much as possible under unnecessary conditions, reduce power consumption, simultaneously meet the requirement of thermal management, properly improve the water temperature of the engine during medium and low loads, further reduce the viscosity of engine oil, further reduce friction among engine parts, enable the engine to be in a better working condition, and realize the effects of saving oil and reducing emission.
S50: if the engine is determined to have overheat risk, inquiring a second rotating speed corresponding to the real-time water temperature and the real-time load in second preset data, and taking the second rotating speed as a target rotating speed of the electronic water pump.
If the fact that the engine does not have overheat risk is determined in second preset data according to the real-time water temperature and the real-time load, inquiring a second rotating speed corresponding to the real-time water temperature and the real-time load in the second preset data, and taking the second rotating speed as a target rotating speed of the electronic water pump to increase cooling flow to avoid overheat of the engine. In actual vehicle operation condition, based on real-time water temperature and real-time load inquiry of the engine, the method aims to confirm overheat risk under the current whole vehicle transient condition, and after risk is checked, a larger electronic water pump rotating speed is set for the risk condition, so that the water temperature of the engine can be controlled at a reasonable lower level, and overheat is avoided. Even if the rotation speed of the electronic water pump in the second preset data is used, the cooling flow can be regulated to restrain overheat under the condition that the water temperature of the engine is extremely high, the engine is about to overheat or the load of the engine is extremely high and the engine has overheat tendency.
For example, the second preset data at least comprises a first interval without overheat risk and a second interval with overheat risk, if the real-time water temperature of the engine is 110 ℃ and the real-time load of the engine is 70%, determining that the real-time water temperature and the real-time load are in the second interval, determining the second rotating speeds corresponding to 110 ℃ and 70% in the second preset data, and taking the second rotating speeds as target rotating speeds of the electronic water pump to avoid overheat of the engine; if the real-time water temperature of the engine is 80 ℃, the real-time load of the engine is 40%, the real-time water temperature and the real-time load are determined to be in a first interval, the engine has no overheat risk, the first rotation speeds corresponding to the 80 ℃ and 40% are determined in first preset data, and the first rotation speeds are used as target rotation speeds of the electronic water pump, so that the rotation speeds of the electronic water pump are reduced as much as possible under the unnecessary condition, the power consumption is reduced, the thermal management requirement is met, and the water temperature is properly increased under the medium and low loads.
In this embodiment, the second preset data includes a first temperature interval and a second temperature interval, the first temperature interval is 0 ℃ to 99 ℃, the second temperature interval is 100 ℃ to 120 ℃, and the electronic water pump rotation speed value corresponding to each temperature interval is only exemplary, in other embodiments, the second preset data may also include other temperature intervals, the first temperature interval and the second temperature interval may also be other temperature interval ranges, and the electronic water pump rotation speed value corresponding to each temperature interval may also be other rotation speeds, which are not described herein.
S60: and controlling the electronic water pump according to the target rotating speed.
After determining the target rotation speed, the electronic water pump is controlled according to the target rotation speed, for example, the target rotation speed may be directly output to the electronic water pump, so that the output rotation speed of the electronic water pump is the target rotation speed obtained by query.
After the electronic water pump is controlled according to the target rotating speed, the EMS continuously judges the real-time water temperature of the engine, when the real-time water temperature of the engine is found to exceed the overheat temperature threshold value, the EMS considers that the engine has overheat risk, the rotating speed of the electronic water pump is forcedly set to be 100%, namely the flow rate proportion of the electronic water pump is kept at the highest value, the normal heat dissipation function is maintained, and the engine is ensured not to overheat.
It can be understood that, due to the thermal inertia of the cooling system of the vehicle, the water temperature of the engine has the characteristic of slow change, in the transient change process of normal running of the whole vehicle, the target water temperature of the engine is quickly switched along with the working condition of the engine, and the actual water temperature of the engine is difficult to follow the change, so that the closed-loop control of the water temperature of the engine is difficult to realize better precision, or other water temperature sensors are newly added for auxiliary control at higher cost to meet the requirement of closed-loop control; in an open-loop control mode, the control method is actually based on the control concept of converting stepless adjustment of the water temperature of the engine into multi-gear partition, and the rotating speed of the electronic water pump is accurately controlled through two rotating speed data pairs, so that the multi-gear partition control of the water temperature of the engine is realized, the control logic design of the electronic water pump is friendly, the logic is simpler, the control precision requirement is lower, and meanwhile, complicated closed-loop calibration and additional sensor cost are not required to be considered.
In this embodiment, by determining a real-time water temperature of an engine in a vehicle and determining a control mode of an electronic water pump according to the real-time water temperature, if the control mode of the electronic water pump is determined to be an open loop control mode, acquiring a real-time rotation speed and a real-time load of the engine, determining whether the engine has an overheat risk according to the real-time water temperature and the real-time load in the second preset data, wherein the second preset data is the rotation speed data of the electronic water pump determined after evaluating the overheat risk of the engine according to different engine water temperatures and engine loads, if the engine does not have the overheat risk, querying a first rotation speed corresponding to the real-time rotation speed and the real-time load in the first preset data, taking the first rotation speed as a target rotation speed of the electronic water pump, and controlling the electronic water pump according to the target rotation speed when the electronic water pump is in a steady-state working condition of the engine; in the running process of the vehicle, the rotating speed of the electronic water pump is accurately set based on the two rotating speed data, the water temperature of the engine can be set at the optimal level of the steady-state working condition of the engine on the premise of ensuring that the water temperature of the engine is not overheated, and the cooling flow is controlled as required on the premise of meeting the reliability of the water temperature of the engine, so that the real-time requirement of the engine is met.
In an embodiment, setting an electronic water pump rotation speed value in second preset data according to the first preset data, specifically, in an engine water temperature and engine load interval without overheat risk in the second preset data, the electronic water pump rotation speed value corresponding to each engine load is smaller than the electronic water pump rotation speed value corresponding to the engine load in the first preset data; in the engine water temperature and engine load interval with overheat risk, the electronic water pump rotating speed value corresponding to each engine load is larger than the electronic water pump rotating speed value corresponding to the engine load in the first preset data, and the engine is ensured to have no overheat risk. And then in the running process of the vehicle, acquiring the real-time water temperature, the real-time rotating speed and the real-time load of the engine, inquiring second preset data according to the real-time water temperature and the real-time load to acquire second rotating speed, inquiring first preset data according to the real-time rotating speed and the real-time load to acquire first rotating speed, comparing the second rotating speed with the first rotating speed, and taking the larger rotating speed of the second rotating speed and the first rotating speed as the target rotating speed of the electronic water pump, so that the process of judging the overheat risk of the engine according to the real-time water temperature and the real-time load can be reduced, the repeated inquiring step is reduced, the aim that the engine is at high water temperature is realized as much as possible on the premise of meeting the reliability is fulfilled, the friction effect is reduced, the working condition of the engine is optimized, and the energy conservation and the emission reduction are realized.
In an embodiment, the open-loop control mode includes a first open-loop control mode and a second open-loop control mode, as shown in fig. 3, before step S20, that is, before acquiring the real-time rotation speed and the real-time load of the engine, the method further specifically includes the steps of:
SS21: it is determined whether the real-time water temperature is greater than the first open-loop temperature.
In this embodiment, the open-loop control mode is divided into a first open-loop control mode and a second open-loop control mode, and after determining the control mode of the electronic water pump according to the real-time water temperature of the engine, if the control mode of the electronic water pump is determined to be the open-loop mode, it is further determined whether the control mode of the electronic water pump is the first open-loop control mode or the second open-loop control mode according to the real-time water temperature of the engine, so as to execute different open-loop control strategies.
The first open loop control mode is a flexible control mode, and is similar to the traditional thermostat in form, namely, the rotating speed of the electronic water pump is mainly related to the real-time water temperature of the engine, and generally, the principle that the rotating speed of the electronic water pump is higher as the real-time water temperature is higher is required to be met. In the first open loop control mode, a small circulation branch in the engine cooling device is opened to a higher level, so that the cooling liquid in the branch flows uniformly everywhere, at the moment, the engine loses the rapid warming effect, but the radiator branch is still not opened, the temperature rise of the water temperature of the engine enters the common level, or the heat balance is maintained in a cold region (no risk exists in the mode). Under the first open-loop control mode, the rotating speed of the electronic water pump is set to be as small as possible under the premise of ensuring that the cooling of the engine of the system is free from risk and other functional requirements of the vehicle are met (the cooling flow is larger than that in the warm-up control mode), so that the water temperature of the engine rapidly breaks through the first open-loop temperature to enter the second open-loop mode.
Wherein it can be determined whether the real-time water temperature is greater than the first open-loop temperature T c6 To determine a specific open loop control mode.
S22: and if the real-time water temperature is smaller than or equal to the first open-loop temperature, acquiring the external environment temperature of the vehicle, and controlling the rotating speed of the electronic water pump according to the real-time water temperature and the environment temperature.
If the real-time water temperature is determined to be smaller than or equal to the first open-loop temperature, determining to enter a first open-loop control mode, acquiring the external environment temperature of the vehicle at the moment, and controlling the rotating speed of the electronic water pump according to the real-time water temperature and the environment temperature. For example, to ensure the performance of the engine, the higher the real-time water temperature of the engine, the higher the rotational speed of the electronic water pump, the lower the ambient temperature, and the lower the rotational speed of the electronic water pump, under the condition that the ambient temperature is unchanged.
S23: and if the real-time water temperature is greater than the first open-loop temperature, acquiring the real-time rotating speed and the real-time load of the engine.
If the real-time water temperature is determined to be greater than the first open-loop temperature, determining to enter a second open-loop control mode, wherein the real-time rotating speed and the real-time load of the engine are required to be acquired at the moment, so that the rotating speed of the electronic water pump is controlled according to the acquired real-time rotating speed and real-time load of the engine, and the process of the step S30-the step S50 is realized.
In this embodiment, whether the real-time water temperature is greater than the first open-loop temperature is determined, if the real-time water temperature is less than or equal to the first open-loop temperature, the external environment temperature of the vehicle is obtained, the rotation speed of the electronic water pump is controlled according to the real-time water temperature and the environment temperature, if the real-time water temperature is greater than the first open-loop temperature, the real-time rotation speed and the real-time load of the engine are obtained, the open-loop control mode is divided into a first open-loop control mode and a second open-loop control mode, so that different open-loop control strategies are executed according to different engine water temperatures, and the engine water temperature is more matched with the actual working condition requirements of the engine.
In one embodiment, in step S22, the rotational speed of the electronic water pump is controlled according to the real-time water temperature and the ambient temperature, and the method specifically includes the following steps:
s221: and acquiring third preset data, wherein the third preset data is rotation speed data required by the electronic water pump under different engine water temperatures and external environment temperatures.
S222: inquiring a third rotating speed corresponding to the real-time water temperature and the environment temperature in third preset data;
s223: and controlling the output rotating speed of the electronic water pump to be a third rotating speed.
The third preset data are rotation speed data required by the electronic water pump under different engine water temperatures and external environment temperatures. The third preset data are preset electronic water pump rotating speed data, so that in the first open loop control mode, the third preset data are inquired according to the real-time water temperature and the environment temperature of the engine, and therefore the third rotating speed corresponding to the real-time water temperature and the environment temperature of the engine is obtained and is used as the output rotating speed of the electronic water pump. Wherein, the third preset data needs to satisfy the condition: the rotating speed of the electronic water pump is set to be as small as possible on the premise of ensuring that the cooling of the engine is free from risk and other functional requirements of the vehicle are met, and a small circulation branch in the engine cooling device is required to be opened to a higher level, so that the cooling liquid is ensured to flow uniformly everywhere, and the radiator branch is not opened.
In this embodiment, by acquiring third preset data, where the third preset data is rotation speed data of the electronic water pump required by different engine water temperatures and external environment temperatures, inquiring third rotation speeds corresponding to the real-time water temperatures and the environment temperatures in the third preset data, and controlling the output rotation speeds of the electronic water pump to be the third rotation speeds, a specific implementation process of controlling the rotation speeds of the electronic water pump according to the real-time water temperatures and the environment temperatures is refined, and a foundation is provided for controlling the electronic water pump.
In one embodiment, the real-time water temperature includes a cylinder water temperature in an engine cylinder, and in step S50, the rotation speed of the electronic water pump is controlled according to the target rotation speed, and specifically includes the following steps:
s51: and acquiring real-time speed of the vehicle, and acquiring fourth preset data, wherein the fourth preset data is a correction value for correcting the rotating speed of the electronic water pump under different speeds and environmental temperatures.
It should be understood that, in the running process of the vehicle, the same engine working condition may correspond to different vehicle speed working conditions, that is, means different windward conditions, so as to cause different heat dissipation conditions, and in addition, the ambient temperature has an influence on the heat dissipation conditions of the engine, so that a correction factor needs to be set based on the ambient temperature and the vehicle speed to form fourth preset data so as to optimize the rotation speed of the electronic water pump.
In the second open loop control mode, the engine water temperature is higher, at this time, in order to improve the control accuracy of the engine water temperature, the real-time speed of the vehicle can be obtained, fourth preset data can be obtained, a correction value is determined according to the real-time speed, the environment temperature and the fourth preset data of the vehicle, and then the target rotating speed of the electronic water pump is corrected according to the correction value, so that the target rotating speed is optimized, the engine water temperature is more in line with the actual vehicle working condition, wherein the fourth preset data is the correction value for correcting the rotating speed of the electronic water pump under different speeds and environment temperatures, namely, in the fourth preset data, each real-time speed and environment temperature corresponds to one rotating speed correction value of the electronic water pump.
S52: and inquiring correction values corresponding to the real-time vehicle speed and the ambient temperature in fourth preset data.
In the running process of the vehicle, the real-time speed, the ambient temperature and fourth preset data of the vehicle are required to be acquired, and then correction values corresponding to the real-time speed and the ambient temperature are inquired in the fourth preset data so as to correct the target rotating speed.
S53: and correcting the target rotating speed according to the corrected value to obtain a corrected rotating speed.
After acquiring the real-time speed and the ambient temperature of the vehicle, a correction value I corresponding to the real-time speed and the ambient temperature can be inquired in fourth preset data, and then the target rotating speed A is adjusted according to the correction value 0 Correcting to obtain corrected rotation speed A tag The calculation formula of (2) is as follows: a is that tag ＝A 0 *I。
For example, during the running of the vehicle, the current real-time vehicle speed is determined to be 60km/h, the ambient temperature is 20 ℃, and the target rotational speed A 0 70 percent, and in fourth preset data, the corrected value I corresponding to the speed of 60km/h and the ambient temperature of 20 ℃ is found to be 0.9, and the corrected rotating speed is determined to be 56 percent.
In this embodiment, the real-time vehicle speed is 60km/h, the ambient temperature is 20 ℃, the target rotation speed is 70% and is only illustrated as an example, and in other embodiments, the real-time vehicle speed, the ambient temperature and the target rotation speed may be other values, which are not described herein.
S54: and obtaining an external cooling requirement outside the engine, and determining the cooling rotating speed of the electronic water pump according to the external cooling requirement.
During vehicle operation, there may be different cooling demands, such as external cooling demands for warm air, transmission oil cooling, and the like. In the second open loop control mode, the engine water temperature is higher, and external cooling needs such as cooling need to be considered to distribute different cooling flow rates, so that the vehicle comfort is improved.
Therefore, in the second open loop control mode, it is necessary to determine whether there is an external cooling demand from the engine, and if an external cooling demand such as warm air or transmission oil cooling is received, it is necessary to determine the cooling speed S of the electronic water pump according to the external cooling demand and the real-time water temperature (head water temperature) req So that the current cooling rotational speed S req And the engine cylinder cover is prevented from being overheated while the external cooling requirement is met.
The calculation formula is as follows: s is S req ＝f(temp ch ,B req ) Wherein temp ch Is the water temperature of the cylinder cover, B req Solving the combination of external cooling demands, namely the maximum value among the external cooling demands such as warm air, transmission oil cooling and the like.
S55: and determining the cylinder rotating speed of the electronic water pump according to the cylinder water temperature.
In addition, because the temperature rise conditions of the engine cylinder cover and the engine cylinder body are different, in the second open loop control mode, the required rotation speed of the engine cylinder body, namely the cylinder body rotation speed of the electronic water pump, is also required to be determined according to the cylinder body water temperature, and at the moment, the sensor 2 is arranged in the engine cylinder body, and then the proper rotation speed of the electronic water pump and the cylinder body rotation speed S are required to be set based on the cylinder body water temperature of the sensor 2 precb ＝f(temp cb ) Wherein f (temp cb ) To obtain the water temperature temp of the cylinder body cb A determined function.
S56: and determining the output rotating speed of the electronic water pump according to the corrected rotating speed, the cooling rotating speed and the cylinder rotating speed.
In determining the corrected rotation speed A tag Cooling rotational speed S req And cylinder rotation speed S precb Then, determining the output rotation speed A of the electronic water pump according to the corrected rotation speed, the cooling rotation speed and the cylinder rotation speed fin . For example, the corrected rotational speed A is directly corrected tag Cooling rotational speed S req And cylinder rotation speed S precb The maximum rotation speed of the electronic water pump is taken as the output rotation speed A of the electronic water pump fin The engine water temperature is maintained in a higher temperature range, the problem of engine oil dilution can be solved, the working condition of the engine is optimized, and the effects of saving oil and reducing emission are effectively achieved.
In this embodiment, the real-time speed of the vehicle is obtained, and fourth preset data is obtained, the fourth preset data is a correction value for correcting the rotation speed of the electronic water pump at different speeds and ambient temperatures, the correction value corresponding to the real-time speed is queried in the fourth preset data, the target rotation speed is corrected according to the correction value, the corrected rotation speed is obtained, the external cooling requirement outside the engine is obtained, the cooling rotation speed of the electronic water pump is determined according to the external cooling requirement, the cylinder rotation speed of the electronic water pump is determined according to the cylinder water temperature, the output rotation speed of the electronic water pump is determined according to the corrected rotation speed, the cooling rotation speed and the cylinder rotation speed, the step of controlling the electronic water pump according to the target rotation speed is refined, in the second open loop control mode, the influence of the speed and the ambient temperature on the water temperature of the engine is considered, the rotation speed of the electronic water pump is corrected, the cooling requirements of other cooling systems and the rotation speed requirement of the engine cylinder are considered, and on the premise of meeting the functional requirements such as warm air comfort is improved, and the accurate control of the water temperature of the engine is improved.
In one embodiment, in step S56, the output rotation speed of the electronic water pump is determined according to the corrected rotation speed, the cooling rotation speed and the cylinder rotation speed, and the method specifically includes the following steps:
s561: the maximum rotational speed among the correction rotational speed, the cooling rotational speed, and the cylinder rotational speed is determined.
In determining the corrected rotation speed A tag Cooling rotational speed S req And cylinder rotation speed S precb Then, the rotation speed A needs to be corrected tag Cooling rotational speed S req And cylinder rotation speed S precb Is set at the maximum rotational speed of the motor.
S562: and acquiring fifth preset data, wherein the fifth preset data is the rotating speed range of the electronic water pump under different engine water temperatures.
Meanwhile, fifth preset data are required to be acquired, and a rotating speed range corresponding to the water temperature of the cylinder body is determined in the fifth preset data, wherein the fifth preset data are rotating speed ranges calibrated by the electronic water pump at different engine water temperatures.
S563: and determining the rotating speed range of the electronic water pump under the water temperature of the cylinder body in fifth preset data.
Before fifth preset data are acquired, the rotating speed range of the electronic water pump under the water temperature of the cylinder body is determined in the fifth preset data.
S564: and determining whether the maximum rotating speed is in a rotating speed range of the electronic water pump at the water temperature of the cylinder body.
And after determining the rotating speed range of the electronic water pump at the cylinder water temperature in the fifth preset data, determining whether the maximum rotating speed is in the rotating speed range of the electronic water pump at the cylinder water temperature.
S565: and if the maximum rotating speed is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, determining that the output rotating speed of the electronic water pump is the maximum rotating speed.
If the maximum rotation speed is in the rotation speed range of the electronic water pump under the water temperature of the cylinder body, the output correction rotation speed A of the electronic water pump is represented tag Cooling rotational speed S req And cylinder rotation speed S precb After the maximum rotation speed of the engine, the water temperature of the engine is changed normally, no overheat or supercooling occurs, and the output rotation speed of the electronic water pump is determined to be the corrected rotation speed A tag Cooling rotational speed S req And cylinder rotation speed S precb A maximum rotational speed of (a); if the maximum rotation speed is not in the rotation speed range of the electronic water pump under the water temperature of the cylinder body, the output correction rotation speed A of the electronic water pump is represented tag Cooling rotational speed S req And cylinder rotation speed S precb After the maximum rotation speed of the engine, the water temperature of the engine is changed severely, and overheat or supercooling can possibly occur, at this time, the corrected rotation speed A needs to be determined tag Cooling rotational speed S req And cylinder rotation speed S precb If the maximum rotation speed of the cylinder is larger than the maximum value corresponding to the rotation speed range under the cylinder water temperature or smaller than the minimum value corresponding to the rotation speed range under the cylinder water temperature, the rotation speed A is corrected tag Rotational speed of coolingS req And cylinder rotation speed S precb If the maximum rotating speed of the water pump is larger than the corresponding maximum rotating speed range of the water temperature of the cylinder body, taking the corresponding maximum rotating speed range as the output rotating speed of the electronic water pump; if the corrected rotation speed A tag Cooling rotational speed S req And cylinder rotation speed S precb And (3) taking the minimum value corresponding to the rotating speed range of the cylinder water temperature as the output rotating speed of the electronic water pump if the maximum rotating speed of the cylinder water temperature is smaller than the minimum value corresponding to the rotating speed range of the cylinder water temperature.
For example, the current water temperature of the cylinder body of the engine is 60 ℃, the corresponding rotating speed range of 60 ℃ in the fifth preset data is 50-60%, if the rotating speed A is corrected tag Cooling rotational speed S req And cylinder rotation speed S precb If the maximum rotation speed of the motor is 55%, the corrected rotation speed A is determined tag Cooling rotational speed S req And cylinder rotation speed S precb The maximum rotation speed of the electronic water pump is in the rotation speed range of the electronic water pump under the water temperature of the cylinder body, and 55% is taken as the output rotation speed of the electronic water pump; if the corrected rotation speed A tag Cooling rotational speed S req And cylinder rotation speed S precb If the maximum rotation speed of the motor is 45%, the corrected rotation speed A is determined tag Cooling rotational speed S req And cylinder rotation speed S precb The maximum rotating speed of the electronic water pump is not in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, and 50% is taken as the output rotating speed of the electronic water pump; if the corrected rotation speed A tag Cooling rotational speed S req And cylinder rotation speed S precb If the maximum rotation speed of the motor is 65%, the corrected rotation speed A is determined tag Cooling rotational speed S req And cylinder rotation speed S precb The maximum rotating speed of the electronic water pump is not in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, and 60% is used as the output rotating speed of the electronic water pump, so that the situation that the water temperature of the engine does not meet the actual requirement due to the fact that the rotating speed of the electronic water pump is too high or too low is avoided.
In this embodiment, the cylinder water temperature of the engine is 60 ℃, and the rotation speed range corresponding to the cylinder water temperature in the fifth preset data is 50% -60% is only illustrative, and in other embodiments, the real-time water temperature of the engine and the rotation speed range corresponding to the cylinder water temperature in the fifth preset data may also be other values, which are not described herein.
In this embodiment, the fifth preset data is obtained by determining the maximum rotation speed among the correction rotation speed, the cooling rotation speed and the cylinder rotation speed, and the rotation speed range of the electronic water pump at the real-time cylinder water temperature is determined in the fifth preset data, whether the maximum rotation speed correction rotation speed is in the rotation speed range of the electronic water pump at the real-time cylinder water temperature is determined, if the maximum rotation speed correction rotation speed is in the rotation speed range of the electronic water pump at the cylinder water temperature, the output rotation speed of the electronic water pump is determined to be the maximum rotation speed correction rotation speed, the specific step of determining the output rotation speed of the electronic water pump according to the correction rotation speed, the cooling rotation speed and the cylinder rotation speed is refined, the output rotation speed of the electronic water pump is ensured not to exceed the rotation speed range corresponding to the current cylinder water temperature, and the accuracy of controlling the engine water temperature is further improved.
In an embodiment, after step S10, that is, after determining the control mode of the electronic water pump according to the real-time water temperature, the method further specifically includes the following steps:
S11: if the control mode of the electronic water pump is the warm-up control mode, whether the cylinder water temperature in the real-time water temperature is smaller than the first preset temperature or not is determined, and the water temperature in the warm-up control mode is lower than the water temperature in the open-loop control mode.
After the whole vehicle is electrified, the EMS reads the real-time water temperature (comprising the water temperature of the cylinder cover and the water temperature of the cylinder body) of the engine and judges in a cold start threshold value entering a control mode, when the water temperature of the cylinder cover of the engine is larger than the cold start threshold value of the cylinder cover or the water temperature of the cylinder body of the engine is larger than the cold start threshold value of the cylinder body, the engine is considered to be hot start, the electronic water pump enters a normal working mode (comprising an open loop control mode and a closed loop control mode), when the water temperature of the cylinder cover is smaller than or equal to the cold start threshold value of the cylinder cover and the water temperature of the cylinder body of the engine is smaller than or equal to the cold start threshold value of the cylinder body, the engine is considered to be in the cold start mode, and in the cold start mode, the electronic water pump can realize one of the main functions of the cold start mode, namely the engine needs to be warmed up, and the electronic water pump is controlled to enter a warm-up control mode.
The warm-up control mode controls the rotation speed of the electronic water pump, and aims to enable the wall temperature, the engine oil temperature and the water temperature in the engine to rise rapidly.
S12: and if the water temperature of the cylinder body is smaller than the first preset temperature, controlling the output rotating speed of the electronic water pump to be the first warming-up rotating speed.
After determining whether the cylinder water temperature is smaller than the first preset temperature, if the cylinder water temperature is smaller than the first preset temperature, indicating that the engine temperature is lower and possibly in a cold region, entering a zero flow mode, and controlling the rotating speed of the electronic water pump to be the first warming-up rotating speed at the moment, wherein the first warming-up rotating speed is 0%, namely the rotating speed position of the electronic water pump is the full-closing position, carrying out zero flow warming-up, and completely locking heat in the engine to enable the wall temperature to quickly rise, so that the engine oil temperature is quickly raised, and the problem of dilution caused by long-term too low engine oil temperature in the cold region is avoided. The main oil duct and the oil pan are arranged at the lower part of the engine, the stage is mainly based on rapid temperature rise of the cylinder body, and the cooling liquid flow of the whole engine can be disconnected due to lower water temperature of the cylinder body of the engine, so that the engine without cooling effect can be rapidly heated until the water temperature of the cylinder body is greater than or equal to the first preset temperature, the engine exits from the zero flow mode, and the engine enters into the ultralow flow mode.
S13: if the cylinder water temperature is greater than or equal to the first preset temperature, determining whether the cylinder water temperature is greater than the second preset temperature.
After determining whether the cylinder water temperature is less than a first preset temperature, if the cylinder water temperature is greater than or equal to the first preset temperature, the first preset temperature is determined whether the cylinder water temperature is greater than a second preset temperature.
S14: and if the water temperature of the cylinder body is smaller than or equal to the second preset temperature, controlling the output rotating speed of the electronic water pump to be the second warming-up rotating speed.
If the water temperature of the cylinder body is larger than or equal to the first preset temperature, and the water temperature of the cylinder body is smaller than or equal to the second preset temperature, the indicated temperature is reasonable, but the temperature of the branch of the cylinder body cannot be reached, an ultralow flow mode is entered, the rotating speed of the electronic water pump is controlled to be the second warming-up rotating speed, the second warming-up rotating speed is larger than the first warming-up rotating speed, and the ultralow flow stage is entered. In the ultralow flow stage, engine oil temperature enters a reasonable range, engine water temperature and wall temperature quickly rise, at the moment, if the engine continues in a zero flow state, a water temperature sensor at a water outlet of a cylinder cover cannot know the correct engine water temperature and cannot ensure reliability because of the fact that the engine is outside the engine, and when in zero flow, the temperature difference exists between cold water and hot water inside the engine and the temperature difference exists between the cold water and the hot water inside the engine, the water temperature in each branch is not uniform, at the moment, the rotating speed of an electronic water pump needs to be controlled to be a second warming-up rotating speed, the engine is in ultralow flow correspondence until the cylinder body water temperature of the engine reaches a third preset temperature, the ultralow flow mode is exited, and the low flow stage is entered.
Under the ultralow flow mode, the electronic water pump operates at the lowest rotating speed, so that the internal part of the engine is kept at the ultralow flow, the temperature of the cooling liquid is kept uniform, meanwhile, the radiator is kept to be closed, and at the moment, the heat is uniformly distributed in the whole small cycle but is not dissipated outwards, and the quick warm-up can be accelerated; if the temperature control module is used in the engine cooling device in a matching way, the opening of the temperature control module is set at a very small position, so that only a small flow (such as a flow of about 1L/min) is maintained in the engine cooling device, at the moment, the cylinder body is completely closed, but a slight flow is maintained in the cylinder cover to pass through a small cycle, and the slight flow does not pass through the radiator; if the thermostat is used in the engine cooling device, the cylinder is completely closed at the moment, and the small cycle is completely opened.
S15: if the cylinder water temperature is greater than the second preset temperature, determining a third warming-up rotating speed of the electronic water pump according to the cylinder water temperature, and controlling the output rotating speed of the electronic water pump to be the third warming-up rotating speed.
In the engine warming process, if the water temperature of the cylinder body is greater than or equal to the second preset temperature, the warming-up is effective, at the moment, the heat in the cylinder body and the accumulation of the heat to a certain degree need to be considered, at the moment, the warming-up stage is close to tail sound, the low flow mode is entered, the rotating speed of the electronic water pump needs to be gradually increased, and the rotating speed S is caused warmup ＝f(temp cb ) Wherein temp cb Is the cylinder temperature. Meanwhile, if the temperature control module is used in the engine cooling device in a matched manner, the engine cooling device is provided with a cooling deviceThe opening of the temperature control module is gradually increased to open the cylinder branch, and the opening P of the temperature control module cbtmm ＝f(temp cb )，temp cb The water temperature of the cylinder body in the cylinder body of the engine is; if a thermostat is used in the engine cooling device, the cylinder branch is opened completely. After that, the cylinder block temperature and the cylinder head temperature of the engine are continuously judged until the low flow mode is exited to enter the open loop control mode.
In this embodiment, if it is determined that the control mode of the electronic water pump is the warm-up control mode, it is determined whether the real-time water temperature of the cylinder water temperature in the real-time water temperature is lower than the first preset temperature, if the real-time water temperature of the cylinder water temperature is lower than the first preset temperature, the output rotation speed of the electronic water pump is controlled to be the first warm-up rotation speed, and timing is performed, if the real-time water temperature of the cylinder water temperature is greater than or equal to the first preset temperature, it is determined whether the cylinder water temperature is greater than the second preset temperature, if the real-time water temperature of the cylinder water temperature is less than or equal to the second preset temperature, it is determined whether the real-time water temperature is greater than the second preset temperature, if the real-time water temperature is less than or equal to the second preset temperature, or the timing time is longer than the first preset time, the output rotating speed of the electronic water pump is controlled to be the second warming-up rotating speed, if the water temperature of the cylinder body is greater than the second preset temperature, the third warming-up rotating speed of the electronic water pump is determined according to the water temperature of the cylinder body, the output rotating speed of the electronic water pump is controlled to be the third warming-up rotating speed, the specific control process of the rotating speed of the electronic water pump in the warming-up control mode is defined, the engine warming-up stage is divided into three stages of zero flow, ultralow flow and low flow, the cooling requirements in different stages can be met, the problem of engine oil dilution is solved on the premise of meeting the functional requirements such as warm air comfort, the cooling flow is controlled as required on the premise of effectively meeting the reliability, and the effect of saving oil and reducing emission is further achieved.
In an embodiment, after step S14, that is, after controlling the output rotation speed of the electronic water pump to be the second warming-up rotation speed, the method further specifically includes the following steps:
s141: and determining whether the cylinder cover water temperature in the real-time water temperature is larger than a third preset temperature, wherein the third preset temperature is smaller than the second preset temperature and larger than the first preset temperature.
After controlling the output rotation speed of the electronic water pump to be the second warming-up rotation speed, the EMS needs to determine whether the cylinder head water temperature in the real-time water temperature is greater than a third preset temperature, wherein the third preset temperature is smaller than the second preset temperature and greater than the first preset temperature, i.e. whether the cylinder head water temperature is greater than the third preset temperature in the ultra-low flow stage is determined.
S142: if the cylinder head water temperature is greater than a third preset temperature, determining whether an external cooling demand outside the engine is received.
After determining whether the cylinder head water temperature is greater than the third preset temperature, in the ultra-low flow stage, if the cylinder head water temperature is greater than the third preset temperature, it is determined whether an external cooling demand from outside the engine, such as an external cooling demand of warm air, transmission oil cooling, etc., is received.
S143: and if the external cooling requirement outside the engine is received, determining the cooling rotating speed of the electronic water pump according to the external cooling requirement.
At quick warm-up initial stage because of the temperature is too low, if respond other branch road demands, flow into other systems, say cool off the EGR and will cause condensation phenomenon, if get into the real no effect of warm braw system, but when the temperature is higher than the threshold value, the preliminary meaning that possesses, can begin to consider function, the travelling comfort of other systems, after confirming that the cylinder cap temperature is greater than the third and predetermine the temperature, if there is not external cooling demand at this moment, then continue to maintain ultra-low flow, the output rotational speed of electronic water pump still is the second warm-up rotational speed of ultra-low flow mode, if there is external cooling demand, then confirm the cooling rotational speed of electronic water pump according to external cooling demand, make the cooling flow of electronic water pump can satisfy external cooling demand.
S144: and determining a fourth warm-up rotating speed of the electronic water pump according to the water temperature and the cooling rotating speed of the cylinder body.
After the cooling rotation speed of the electronic water pump is determined according to the external cooling demand, a fourth warm-up rotation speed of the electronic water pump is also required to be determined according to the cylinder water temperature and the cooling rotation speed. Wherein, the fourth warm-up rotating speed S of the electronic water pump warmup ＝f(temp ch ,B req ) Wherein temp ch Is the water temperature of the cylinder cover, B req The combined solution for the external cooling demand is the maximum of warm air, transmission oil cooling, etc.
S145: and controlling the output rotating speed of the electronic water pump to be the fourth warming-up rotating speed.
In determining the fourth warm-up rotation speed S of the electronic water pump warmup And then, controlling the output rotating speed of the electronic water pump to be the fourth warming-up rotating speed so as to ensure the temperature rise of the engine and solve the problem of engine oil dilution on the premise of meeting the functional requirements such as warm air comfort and the like. In addition, if the engine cooling device is matched with a temperature control module, the opening degree of the temperature control module is also required to be gradually adjusted, the opening degree is increased to a position meeting external cooling requirements, if the engine cooling device is matched with a thermostat, the cylinder body branch is ensured to be completely closed, the small circulation branch on the cylinder cover is fully opened, and then the cylinder body temperature in the engine cylinder body is continuously judged until the engine cylinder body exits from a warm-up control mode, and the engine cylinder body enters into an open-loop control mode.
In this embodiment, after controlling the output rotation speed of the electronic water pump to be the second warm-up rotation speed, determining whether the cylinder head water temperature in the real-time water temperature is greater than the third preset temperature, if the cylinder head water temperature is greater than the third preset temperature, determining whether an external cooling requirement outside the engine is received, if the external cooling requirement outside the engine is received, determining the cooling rotation speed of the electronic water pump according to the external cooling requirement, determining the fourth warm-up rotation speed of the electronic water pump according to the cylinder body water temperature and the cooling rotation speed, controlling the output rotation speed of the electronic water pump to be the fourth warm-up rotation speed, considering the external cooling requirement of other systems in an ultralow flow stage of warming the engine, solving the problem of engine oil dilution on the premise of meeting the functional requirements such as warm air comfort, realizing cooling flow on demand control on the premise of effectively meeting reliability, and further realizing the effect of oil saving and emission reduction.
In an embodiment, after step S15, that is, after controlling the output rotation speed of the electronic water pump to be the third warming-up rotation speed, the method further specifically includes the following steps:
s151: and acquiring the environment temperature of the vehicle, and determining whether the environment temperature is less than a preset environment temperature.
After the output rotation speed of the electronic water pump is controlled to be the third warm-up rotation speed, namely in the low flow mode, the warm-up control mode needs to be exited along with the rapid increase of the water temperature of the engine so as to avoid the overhigh water temperature and enter the next control mode. Wherein, the electronic water pump can exit the warm-up control mode under two conditions: the first is that under the ordinary condition, the engine EMS continuously judges whether the real-time water temperature (comprising the water temperature of the cylinder cover and the water temperature of the cylinder body) exceeds the cold start threshold, when the water temperature threshold of the cylinder cover is higher than the cold start threshold of the cylinder cover or the water temperature of the cylinder body is higher than the cold start threshold of the cylinder cover, the engine exits the warm-up control mode, and at the moment, the use of ultra-low flow is forbidden, and the cooling flow of the electronic water pump needs to be gradually increased along with the rising of the real-time water temperature so as to avoid the overheating of the engine.
The second type is mainly used for coping with cold areas, because the temperature of the cold areas is low, the heat dissipation capacity of the whole vehicle is extremely high when the vehicle runs, heat accumulation is difficult, so that the temperature of the engine is easy to be at a low level and cannot rise, the engine is possibly in a heat balance state, other problems can be easily caused by continuously limiting the electronic water pump to an extremely low rotating speed (at this time, the engine cabin and the cylinder cover are not cold any more, the low flow rate can not ensure uniform temperature field, local hot spots exist, the risk is not completely avoided, and other functional branches can need large flow rate, such as long-time maintenance at the low flow rate, and the other functional branches can not be met). Therefore, in the low flow mode, the ambient temperature of the vehicle is acquired, and whether the ambient temperature is smaller than the preset ambient temperature is determined, that is, whether the vehicle is in the cold region is determined, so that the warm-up control mode exit strategy of the cold region is executed in the cold region.
S152: if the ambient temperature is less than the preset ambient temperature, determining whether the cylinder head water temperature in the real-time water temperature is greater than a fourth preset temperature, wherein the fourth preset temperature is less than the first open-loop temperature.
After determining whether the ambient temperature is less than the preset ambient temperature, if the ambient temperature is less than the preset ambient temperature, determining that the vehicle is in a cold region, wherein the real-time water temperature of the engine reaches a set cold start threshold value due to the fact that the vehicle may have heat balance in the cold region, and determining whether the cylinder cover water temperature in the real-time water temperature is greater than a fourth preset temperature is needed. Wherein the fourth preset temperature is less than the first open loop temperature.
If the ambient temperature is greater than or equal to the preset ambient temperature, determining that the vehicle is not in a cold region, and judging to exit the warm-up control mode normally according to the temperature rise condition of the engine without limiting the warm-up duration.
S153: if the water temperature of the cylinder cover is larger than the fourth preset temperature, timing is performed, and the warming-up duration corresponding to the ambient temperature is inquired in sixth preset data.
If the cylinder cover water temperature is greater than the fourth preset temperature, timing is needed to be performed on the time when the cylinder cover water temperature is greater than the fourth preset temperature so as to avoid overheating of the cylinder cover, and the warming-up time corresponding to the environment temperature is inquired in the sixth preset data. The sixth preset data is an allowable warm-up duration of the electronic water pump calibrated at the ambient temperature. The real vehicle environment test can be carried out on the vehicle so as to calibrate the longest warm-up duration (namely the warm-up limiting duration) of the engine at different environment temperatures, thereby obtaining sixth preset data, wherein in the sixth preset data, different warm-up limiting durations are corresponding to different environment temperatures, so that the accuracy of the warm-up limiting duration is ensured.
S154: if the timing time is longer than the warming-up time corresponding to the ambient temperature, determining that the control mode of the electronic water pump is an open-loop control mode.
When the timing time is longer than the warming-up time corresponding to the ambient temperature, the fact that the engine is overheated possibly caused by continuing to warm up is indicated, and the warming-up control mode needs to be exited, and the open-loop control mode is entered.
In this embodiment, after controlling the output rotation speed of the electronic water pump to be the third warm-up rotation speed, it is required to obtain the ambient temperature where the vehicle is located, determine whether the ambient temperature is less than a preset ambient temperature, if the ambient temperature is less than the preset ambient temperature, determine whether the cylinder head water temperature in the real-time water temperature is greater than a fourth preset temperature, the fourth preset temperature is less than the first open-loop temperature, if the cylinder head water temperature is greater than the fourth preset temperature, time counting is performed, and a warm-up duration corresponding to the ambient temperature is queried in the sixth preset data, if the time counting is greater than the warm-up duration corresponding to the ambient temperature, it is determined that the control mode of the electronic water pump is an open-loop control mode, after entering the warm-up control mode, a specific strategy for exiting the warm-up control mode is defined for the warm-up stage, and special situations of cold regions can be dealt with by the early warm-up exit strategy, both warm-up exit strategies are ensured, and normal use of the engine is ensured.
In one embodiment, if two water temperature sensors are included in the engine cooling device: a sensor 1 at the water outlet of the engine cylinder cover and a sensor 2 in the engine cylinder body. When the two water temperature sensors are normal, taking the water temperature of the cylinder cover obtained by detection of the sensor 1 at the water outlet of the cylinder cover of the engine as a judgment basis of a water temperature threshold value in an open loop control mode and overheat judgment at the cylinder cover; the sensor 2 in the engine cylinder detects the obtained cylinder water temperature as a basis for determining the water temperature threshold in the warm-up control mode, and overheat determination at the cylinder. The purpose of setting up sensor 2 in the engine cylinder body is mainly because cylinder body, cylinder cap reposition of redundant personnel, can adjust respectively the cylinder body, cylinder cap flow and influence under the condition of engine temperature at two thermostat or temperature control module, and the temperature in two regions does not have strong correlation, needs two temperature sensor to detect alone.
After the whole vehicle is electrified, two water temperature sensors are required to be checked to judge faults, the judging mode of the faults of the water temperature sensors can be determined by the vehicle ECU, the ECU can judge according to the water temperature signals of the water temperature sensors, if any fault of the maximum faults, the minimum faults and the unreasonable faults of the water temperature sensors is determined according to the water temperature signals, the engine is not required to judge the water temperature conditions, and an alarm prompt is required to be sent to prompt the faults of the water temperature sensors of users.
When the sensor 1 at the water outlet of the engine cylinder cover fails, the standard for judging all water temperature thresholds is lost, so that the user is directly warned to know the failure condition, the rotating speed of the electronic water pump is regulated to 100%, namely the flow ratio of the water pump is kept at the highest value, the normal heat dissipation function is maintained, and the engine is ensured not to overheat; if the sensor 2 in the engine cylinder is found to be faulty, in the warm-up control mode, that is, in the engine warm-up stage, the stage of fully closing the cylinder branch needs to be abandoned, the setting of the electronic water pump speed based on the cylinder water temperature needs to be canceled, the electronic water pump speed needs to be controlled according to the cylinder water temperature, the electronic water pump is kept at a small speed in an ultralow flow mode, the circulation of the cylinder cooling flow is ensured (no cylinder and cylinder head fully closing stage at this time), when the cylinder water temperature exceeds a certain temperature, the warm-up control mode is exited, the lower speed limit of the electronic water pump needs to ensure the full opening of the cylinder after the warm-up control mode is exited, and in the subsequent first open-loop control mode and the first open-loop control mode, the electronic water pump speed control based on the cylinder water temperature is abandoned.
In an embodiment, the first preset data, the second preset data, the third preset data, the fourth preset data, the fifth preset data and the sixth preset data are all formulated into two-dimensional tables, and the first preset table, the second preset table, the third preset table, the fourth preset table, the fifth preset table and the sixth preset table are formed and stored in the vehicle, so that in the running process of the vehicle, the corresponding preset tables are directly queried according to corresponding parameters of the real-time water temperature, the real-time rotating speed, the real-time load, the ambient temperature and the like of the engine, the query time is reduced, the response speed of the electronic water pump is improved, and the fine control of the cooling flow is further improved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
In one embodiment, an electronic water pump control device for an engine is provided, where the electronic water pump control device for an engine corresponds to the electronic water pump control method for an engine in the above embodiment one by one. As shown in fig. 4, the electronic water pump control device for the engine includes a first determining module 401, an obtaining module 402, a second determining module 403, a querying module 404 and a control module 405. The functional modules are described in detail as follows:
a first determining module 401, configured to determine a real-time water temperature of an engine in a vehicle, and determine a control mode of an electronic water pump according to the real-time water temperature;
an obtaining module 402, configured to obtain a real-time rotation speed and a real-time load of the engine if it is determined that the control mode of the electronic water pump is an open-loop control mode;
a second determination module 403 for determining whether the engine is at risk of overheating based on the real-time water temperature and the real-time load;
the query module 404 is configured to query, if it is determined that the engine has no risk of overheating, first preset data, where the first preset data is rotational speed data of the electronic water pump calibrated under a steady-state working condition of the engine, where the first rotational speed corresponds to the real-time rotational speed and the real-time load, and the first rotational speed is used as a target rotational speed of the electronic water pump;
And the control module 405 is used for controlling the electronic water pump according to the target rotating speed.
Further, after determining whether the engine is at risk of overheating according to the real-time water temperature and the second preset data, the query module 404 is further configured to:
if the engine is determined to have overheat risk, inquiring a second rotating speed corresponding to the real-time water temperature and the real-time load in second preset data, and taking the second rotating speed as a target rotating speed of the electronic water pump, wherein the second preset data is determined electronic water pump rotating speed data after the overheat risk of the engine is evaluated according to different engine water temperatures and engine loads.
Further, before the acquiring the real-time rotation speed and the real-time load of the engine, the control module 405 is further specifically configured to:
determining whether the real-time water temperature is greater than a first open-loop temperature;
if the real-time water temperature is smaller than or equal to the first open-loop temperature, acquiring the external environment temperature of the vehicle, and controlling the rotating speed of the electronic water pump according to the real-time water temperature and the environment temperature;
and if the real-time water temperature is greater than the first open-loop temperature, acquiring the real-time rotating speed and the real-time load of the engine.
Further, the control module 405 is specifically further configured to:
acquiring third preset data, wherein the third preset data are rotation speed data required by the electronic water pump at different engine water temperatures and external environment temperatures;
inquiring a third rotating speed corresponding to the real-time water temperature and the environment temperature in the third preset data;
and controlling the output rotating speed of the electronic water pump to be the third rotating speed.
Further, the real-time water temperature includes a cylinder water temperature in the engine cylinder, and the control module 405 is specifically configured to:
acquiring real-time speed of the vehicle and fourth preset data, wherein the fourth preset data is a correction value for correcting the rotating speed of the electronic water pump under different speeds and environmental temperatures;
inquiring a correction value corresponding to the real-time vehicle speed in the fourth preset data;
correcting the target rotating speed according to the correction value to obtain a corrected rotating speed;
acquiring an external cooling requirement outside the engine, and determining the cooling rotating speed of the electronic water pump according to the external cooling requirement;
determining the cylinder rotating speed of the electronic water pump according to the cylinder water temperature;
and determining the output rotating speed of the electronic water pump according to the corrected rotating speed, the cooling rotating speed and the cylinder rotating speed.
Further, the control module 405 is specifically configured to:
determining a maximum rotational speed of the corrected rotational speed, the cooling rotational speed, and the cylinder rotational speed;
obtaining fifth preset data, wherein the fifth preset data is a rotating speed range of the electronic water pump under different engine water temperatures;
determining the rotating speed range of the electronic water pump under the water temperature of the cylinder body in the fifth preset data;
determining whether the maximum rotation speed is in a rotation speed range of the electronic water pump at the water temperature of the cylinder body;
and if the maximum rotating speed is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, determining the output rotating speed of the electronic water pump as the maximum rotating speed.
Further, after the control mode of the electronic water pump is determined according to the real-time water temperature, the control module 405 is further specifically configured to:
if the control mode of the electronic water pump is a warming-up control mode, determining whether the cylinder water temperature in the real-time water temperature is smaller than a first preset temperature, wherein the water temperature in the warming-up control mode is lower than the water temperature in the open-loop control mode;
if the water temperature of the cylinder body is smaller than the first preset temperature, controlling the output rotating speed of the electronic water pump to be a first warming-up rotating speed;
If the cylinder water temperature is greater than or equal to the first preset temperature, determining whether the cylinder water temperature is greater than a second preset temperature;
if the water temperature of the cylinder body is smaller than or equal to the second preset temperature, controlling the output rotating speed of the electronic water pump to be a second warming-up rotating speed;
and if the cylinder water temperature is greater than the second preset temperature, determining a third warm-up rotating speed of the electronic water pump according to the cylinder water temperature, and controlling the output rotating speed of the electronic water pump to be the third warm-up rotating speed.
Further, after the controlling the output rotation speed of the electronic water pump to be the second warm-up rotation speed, the control module 405 is further specifically configured to:
determining whether the cylinder cover water temperature in the real-time water temperature is larger than a third preset temperature, wherein the third preset temperature is smaller than the second preset temperature and larger than the first preset temperature;
if the cylinder cover water temperature is higher than the third preset temperature, determining whether an external cooling requirement outside the engine is received;
if an external cooling requirement outside the engine is received, determining the cooling rotating speed of the electronic water pump according to the external cooling requirement;
determining a fourth warm-up rotation speed of the electronic water pump according to the cylinder water temperature and the cooling rotation speed;
And controlling the output rotating speed of the electronic water pump to be the fourth warming-up rotating speed.
Further, after the controlling the output rotation speed of the electronic water pump to be the third warming-up rotation speed, the control module 405 is further specifically configured to:
acquiring the environment temperature of the vehicle, and determining whether the environment temperature is smaller than a preset environment temperature;
if the ambient temperature is smaller than the preset ambient temperature, determining whether the cylinder head water temperature in the real-time water temperature is larger than a fourth preset temperature, wherein the fourth preset temperature is smaller than a first open-loop temperature;
if the cylinder cover water temperature is greater than the fourth preset temperature, timing is performed, and the warm-up time corresponding to the ambient temperature is queried in sixth preset data;
and if the timing time is longer than the warming-up time corresponding to the ambient temperature, determining that the control mode of the electronic water pump is an open-loop control mode.
The specific limitation of the electronic water pump control device of the engine can be referred to as the limitation of the electronic water pump control method of the engine, and the detailed description is omitted here. The modules in the electronic water pump control device of the engine can be realized in whole or in part by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, as shown in fig. 5, an engine electronic water pump control device is provided that includes a processor, a memory connected by a system bus. Wherein the processor of the engine electronic water pump control device is used for providing calculation and control capabilities. The memory of the electronic water pump control device of the engine comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The computer program when executed by a processor implements a method of controlling an electronic water pump of an engine.
In one embodiment, an electronic water pump control device for an engine is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the electronic water pump control method for an engine when executing the computer program.
In one embodiment, a readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the engine electronic water pump control method described above.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims (9)

1. An electronic water pump control method for an engine, comprising:
determining the real-time water temperature of an engine in a vehicle, and determining a control mode of an electronic water pump according to the real-time water temperature;
If the control mode of the electronic water pump is determined to be an open loop control mode, acquiring the real-time rotating speed and the real-time load of the engine;
determining whether the engine is at risk of overheating according to the real-time water temperature and the real-time load;
if the engine is determined to have no overheat risk, inquiring a first rotating speed corresponding to the real-time rotating speed and the real-time load in first preset data, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data is rotating speed data calibrated under a steady-state working condition of the engine of the electronic water pump;
controlling the electronic water pump according to the target rotating speed;
wherein, after the control mode of the electronic water pump is determined according to the real-time water temperature, the method further comprises:
if the control mode of the electronic water pump is a warming-up control mode, determining whether the cylinder water temperature in the real-time water temperature is smaller than a first preset temperature, wherein the water temperature in the warming-up control mode is lower than the water temperature in the open-loop control mode;
if the cylinder water temperature is greater than or equal to the first preset temperature, determining whether the cylinder water temperature is greater than a second preset temperature;
If the cylinder water temperature is smaller than or equal to the second preset temperature, after the output rotating speed of the electronic water pump is controlled to be the second warming-up rotating speed, determining whether the cylinder cover water temperature in the real-time water temperature is larger than a third preset temperature, wherein the third preset temperature is smaller than the second preset temperature and larger than the first preset temperature;
if the cylinder cover water temperature is higher than the third preset temperature, determining a cooling rotating speed of the electronic water pump according to external cooling requirements, and determining a fourth warming-up rotating speed of the electronic water pump according to the cylinder body water temperature and the cooling rotating speed;
and controlling the output rotating speed of the electronic water pump to be the fourth warming-up rotating speed.
2. The engine electronic water pump control method according to claim 1, wherein after said determining whether said engine is at risk of overheating based on said real-time water temperature and said real-time load, said method further comprises:
if the engine is determined to have overheat risk, inquiring a second rotating speed corresponding to the real-time water temperature and the real-time load in second preset data, and taking the second rotating speed as a target rotating speed of the electronic water pump, wherein the second preset data is determined electronic water pump rotating speed data after the overheat risk of the engine is evaluated according to different engine water temperatures and engine loads.
3. The engine electronic water pump control method according to claim 1, wherein before the acquiring the real-time rotation speed and the real-time load of the engine, the method further comprises:
determining whether the real-time water temperature is greater than a first open-loop temperature;
if the real-time water temperature is smaller than or equal to the first open-loop temperature, acquiring the external environment temperature of the vehicle, and controlling the rotating speed of the electronic water pump according to the real-time water temperature and the environment temperature;
and if the real-time water temperature is greater than the first open-loop temperature, acquiring the real-time rotating speed and the real-time load of the engine.
4. The engine electronic water pump control method according to claim 3, wherein said controlling the rotational speed of said electronic water pump in accordance with said real-time water temperature and said ambient temperature comprises:
acquiring third preset data, wherein the third preset data are rotation speed data required by the electronic water pump at different engine water temperatures and external environment temperatures;
inquiring a third rotating speed corresponding to the real-time water temperature and the environment temperature in the third preset data;
and controlling the output rotating speed of the electronic water pump to be the third rotating speed.
5. The engine electronic water pump control method according to claim 1, wherein the real-time water temperature includes a cylinder water temperature in the engine cylinder, the controlling the electronic water pump according to the target rotation speed includes:
acquiring real-time speed of the vehicle and fourth preset data, wherein the fourth preset data is a correction value for correcting the rotating speed of the electronic water pump under different speeds and environmental temperatures;
inquiring a correction value corresponding to the real-time vehicle speed in the fourth preset data;
correcting the target rotating speed according to the correction value to obtain a corrected rotating speed;
acquiring an external cooling requirement outside the engine, and determining the cooling rotating speed of the electronic water pump according to the external cooling requirement;
determining the cylinder rotating speed of the electronic water pump according to the cylinder water temperature;
and determining the output rotating speed of the electronic water pump according to the corrected rotating speed, the cooling rotating speed and the cylinder rotating speed.
6. The engine electronic water pump control method according to claim 5, wherein the determining the output rotation speed of the electronic water pump based on the corrected rotation speed, the cooling rotation speed, and the cylinder rotation speed includes:
Determining a maximum rotational speed of the corrected rotational speed, the cooling rotational speed, and the cylinder rotational speed;
obtaining fifth preset data, wherein the fifth preset data is a rotating speed range of the electronic water pump under different engine water temperatures;
determining the rotating speed range of the electronic water pump under the water temperature of the cylinder body in the fifth preset data;
determining whether the maximum rotation speed is in a rotation speed range of the electronic water pump at the water temperature of the cylinder body;
and if the maximum rotating speed is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, determining the output rotating speed of the electronic water pump as the maximum rotating speed.
7. The engine electronic water pump control method according to any one of claims 1 to 6, characterized in that after the determination of whether the cylinder water temperature in the real-time water temperature is less than a first preset temperature, the method further comprises:
if the water temperature of the cylinder body is smaller than the first preset temperature, controlling the output rotating speed of the electronic water pump to be a first warming-up rotating speed;
and if the cylinder water temperature is greater than the second preset temperature, determining a third warm-up rotating speed of the electronic water pump according to the cylinder water temperature, and controlling the output rotating speed of the electronic water pump to be the third warm-up rotating speed.
8. The engine electronic water pump control method according to claim 7, characterized in that after the control of the output rotation speed of the electronic water pump to the third warm-up rotation speed, the method further comprises:
acquiring the environment temperature of the vehicle, and determining whether the environment temperature is smaller than a preset environment temperature;
if the ambient temperature is smaller than the preset ambient temperature, determining whether the cylinder head water temperature in the real-time water temperature is larger than a fourth preset temperature, wherein the fourth preset temperature is smaller than a first open-loop temperature;
if the cylinder cover water temperature is greater than the fourth preset temperature, timing is performed, and the warm-up time corresponding to the ambient temperature is queried in sixth preset data;
and if the timing time is longer than the warming-up time corresponding to the ambient temperature, determining that the control mode of the electronic water pump is an open-loop control mode.
9. An electronic water pump control device for an engine, comprising:
the first determining module is used for determining the real-time water temperature of an engine in the vehicle and determining the control mode of the electronic water pump according to the real-time water temperature;
the acquisition module is used for acquiring the real-time rotating speed and the real-time load of the engine if the control mode of the electronic water pump is determined to be an open-loop control mode;
The second determining module is used for determining whether the engine has overheat risk according to the real-time water temperature and the real-time load;
the inquiring module is used for inquiring the real-time rotating speed and the first rotating speed corresponding to the real-time load in first preset data and taking the first rotating speed as the target rotating speed of the electronic water pump if the engine is determined to have no overheat risk, wherein the first preset data is the rotating speed data calibrated under the steady-state working condition of the engine of the electronic water pump;
the control module is used for controlling the electronic water pump according to the target rotating speed;
the control module is further configured to:
after determining a control mode of the electronic water pump according to the real-time water temperature, if the control mode of the electronic water pump is determined to be a warm-up control mode, determining whether the water temperature of a cylinder body in the real-time water temperature is smaller than a first preset temperature, wherein the water temperature in the warm-up control mode is lower than the water temperature in the open-loop control mode;
if the cylinder water temperature is greater than or equal to the first preset temperature, determining whether the cylinder water temperature is greater than a second preset temperature;
if the cylinder water temperature is smaller than or equal to the second preset temperature, after the output rotating speed of the electronic water pump is controlled to be the second warming-up rotating speed, determining whether the cylinder cover water temperature in the real-time water temperature is larger than a third preset temperature, wherein the third preset temperature is smaller than the second preset temperature and larger than the first preset temperature;
If the cylinder cover water temperature is higher than the third preset temperature, determining a cooling rotating speed of the electronic water pump according to external cooling requirements, and determining a fourth warming-up rotating speed of the electronic water pump according to the cylinder body water temperature and the cooling rotating speed;
and controlling the output rotating speed of the electronic water pump to be the fourth warming-up rotating speed.
CN202110017802.3A 2021-01-07 2021-01-07 Engine electronic water pump control method and device Active CN114738101B (en)

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