CN111434902A - Control method and system of thermostat and vehicle - Google Patents
Control method and system of thermostat and vehicle Download PDFInfo
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- CN111434902A CN111434902A CN201910034197.3A CN201910034197A CN111434902A CN 111434902 A CN111434902 A CN 111434902A CN 201910034197 A CN201910034197 A CN 201910034197A CN 111434902 A CN111434902 A CN 111434902A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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Abstract
The invention discloses a control method and a control system of a thermostat and a vehicle, wherein the method comprises the following steps: determining a basic duty ratio of a thermostat at a target water temperature of an engine according to operating state parameters of the engine, wherein the operating state parameters of the engine comprise engine load, engine speed and air inlet temperature of the engine; calculating the difference value between the target water temperature and the actual water temperature; obtaining the duty ratio of the thermostat according to the basic duty ratio of the thermostat and the difference value; obtaining a parameter value of the estimated duty ratio of the thermostat according to the running state parameter of the engine, the vehicle speed and an air conditioner switching signal; and obtaining the final duty ratio of the thermostat according to the duty ratio of the thermostat and the parameter value of the estimated duty ratio. The method can effectively solve the problem that the water temperature of the engine fluctuates severely or rises above the allowable water temperature of the engine after the thermostat is adopted by controlling the final duty ratio of the thermostat, thereby improving the working stability of the engine.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a thermostat control method and system and a vehicle.
Background
In order to reduce the oil consumption of the whole vehicle and improve the thermal efficiency of the engine, generally, the engine adopts an electronic thermostat to improve the temperature rise rate of the engine, so that the water temperature of the engine is in an optimal working range as soon as possible.
However, most of electronic thermostats are opened by heating wax packs electronically, and there is a certain time delay in the process of heating wax packs electronically, so that the temperature of the engine water fluctuates dramatically or rises above the allowable water temperature of the engine during the opening and closing of the thermostat, which affects the stability of the engine operation.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, a first object of the invention is to propose a method for controlling a thermostat. The method can effectively solve the problem that the water temperature of the engine fluctuates severely or rises above the allowable water temperature of the engine after the thermostat is adopted by controlling the final duty ratio of the thermostat, thereby improving the working stability of the engine.
Another object of the present invention is to provide a control system for a thermostat.
It is a further object of the invention to propose a vehicle.
In order to achieve the above object, an embodiment of a first aspect of the present invention discloses a control method of a thermostat, including the steps of: determining a basic duty ratio of a thermostat at a target water temperature of an engine according to operating state parameters of the engine, wherein the operating state parameters of the engine comprise engine load, engine speed and air inlet temperature of the engine; calculating the difference value between the target water temperature and the actual water temperature; obtaining the duty ratio of the thermostat according to the basic duty ratio of the thermostat and the difference value; obtaining a parameter value of the estimated duty ratio of the thermostat according to the running state parameter of the engine, the vehicle speed and an air conditioner switching signal; and obtaining the final duty ratio of the thermostat according to the duty ratio of the thermostat and the parameter value of the estimated duty ratio.
According to the control method of the thermostat, the duty ratio of the thermostat can be determined according to the basic duty ratio obtained by the running state parameters of the engine and the difference value between the target water temperature and the actual water temperature, the final duty ratio of the thermostat is determined by combining the parameter values of the estimated duty ratio obtained according to the running state parameters of the engine, the vehicle speed and the air conditioner switching signals, and then the situation that the water temperature of the engine fluctuates severely or rushes over the allowable water temperature of the engine after the thermostat is adopted is effectively solved through controlling the final duty ratio of the thermostat, so that the working stability of the engine is improved.
In one embodiment of the present invention, the determining the base duty cycle of the thermostat at the target water temperature of the engine based on the operating state parameter of the engine includes: and inquiring a preset basic duty ratio mapping table of the thermostat according to the engine load and the engine speed so as to obtain the basic duty ratio of the thermostat corresponding to the target water temperature.
In an embodiment of the present invention, before calculating the difference between the target water temperature and the actual water temperature, the method further includes: inquiring a first mapping table according to the engine load and the engine speed, wherein the first mapping table comprises target water temperature values corresponding to the engine load and the engine speed; inquiring a second mapping table according to the vehicle speed and the engine load, wherein the second mapping table comprises target water temperature values corresponding to the vehicle speed and the engine load; inquiring a third mapping table according to the vehicle speed and the air inlet temperature, wherein the third mapping table comprises target water temperature values corresponding to the vehicle speed and the air inlet temperature; and determining the target water temperature according to the query result.
In an embodiment of the present invention, the obtaining a parameter value of an estimated duty ratio of a thermostat according to the operating state parameter of the engine, the vehicle speed and the air conditioner switching signal includes: obtaining an air inlet temperature correction coefficient according to the air inlet temperature, the vehicle speed and an air conditioner switching signal; obtaining a flow correction coefficient according to the rotating speed of the engine; and obtaining a parameter value of the estimated duty ratio of the thermostat according to the intake temperature correction coefficient and the flow correction coefficient.
An embodiment of a second aspect of the present invention discloses a control system of a thermostat, comprising: the basic duty ratio determining module of the thermostat is used for determining the basic duty ratio of the thermostat at the target water temperature of the engine according to the running state parameters of the engine, wherein the running state parameters of the engine comprise engine load, engine rotating speed and air inlet temperature of the engine; the difference value calculating module is used for calculating the difference value between the target water temperature and the actual water temperature; the duty ratio determining module of the thermostat is used for obtaining the duty ratio of the thermostat according to the basic duty ratio of the thermostat and the difference value; the estimated duty ratio parameter value determination module is used for obtaining the estimated duty ratio parameter value of the thermostat according to the running state parameter of the engine, the vehicle speed and the air conditioner switching signal; and the final duty ratio calculation module is used for obtaining the final duty ratio of the thermostat according to the duty ratio of the thermostat and the parameter value of the estimated duty ratio.
According to the control system of the thermostat, the duty ratio of the thermostat can be determined according to the basic duty ratio obtained by the running state parameters of the engine and the difference value between the target water temperature and the actual water temperature, the final duty ratio of the thermostat is determined by combining the parameter values of the estimated duty ratio obtained according to the running state parameters of the engine, the vehicle speed and the air conditioner switching signals, and then the situation that the water temperature of the engine fluctuates severely or rushes to be higher than the allowable water temperature of the engine after the thermostat is adopted is effectively solved through the control of the final duty ratio of the thermostat, so that the working stability of the engine is improved.
In an embodiment of the invention, the thermostat basic duty cycle determination module is configured to query a preset thermostat basic duty cycle mapping table according to the engine load and the engine speed to obtain the thermostat basic duty cycle corresponding to the target water temperature.
In an embodiment of the invention, before calculating the difference between the target water temperature and the actual water temperature, the difference calculation module is further configured to query the first mapping table according to an engine load and an engine speed, query the second mapping table according to a vehicle speed and the engine load, query the third mapping table according to the vehicle speed and an intake air temperature, and determine the target water temperature according to a query result.
In an embodiment of the invention, the module for determining the parameter value of the estimated duty ratio is configured to obtain an intake air temperature correction coefficient according to the intake air temperature, the vehicle speed and an air conditioner switching signal, obtain a flow correction coefficient according to the engine speed, and obtain the parameter value of the estimated duty ratio of the thermostat according to the intake air temperature correction coefficient and the flow correction coefficient.
In one embodiment of the invention, the thermostat is an electronic thermostat.
An embodiment of a third aspect of the invention discloses a vehicle, comprising: the control system of the thermostat according to the second aspect of the embodiment described above. The vehicle can determine the duty ratio of the thermostat according to the basic duty ratio obtained by the running state parameters of the engine and the difference value between the target water temperature and the actual water temperature, and determine the final duty ratio of the thermostat by combining the estimated duty ratio parameter values obtained by the running state parameters of the engine, the vehicle speed and the air conditioner switching signals, and then effectively solve the problem that the water temperature of the engine fluctuates severely or rises above the allowable water temperature of the engine after the thermostat is adopted by controlling the final duty ratio of the thermostat, so that the working stability of the engine is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method of controlling a thermostat according to one embodiment of the present invention;
FIG. 2 is a block diagram of a control system for a thermostat according to one embodiment of the present invention.
FIG. 3 is a schematic diagram of the operation of a control system for a thermostat according to one embodiment of the invention. The MAPs 1 to 8 are 8 mapping tables, respectively.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a control method and system of a thermostat and an automobile according to an embodiment of the invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of a thermostat according to one embodiment of the invention.
As shown in fig. 1, a control method of a thermostat according to an embodiment of the present invention includes the steps of:
s101: and determining the basic duty ratio of the thermostat at the target water temperature of the engine according to the running state parameters of the engine.
The operating state parameters of the engine include, but are not limited to, engine load, engine speed, and engine intake air temperature.
As a specific example, the basic duty ratios of the thermostats corresponding to different target water temperatures are pre-stored in the vehicle, and the basic duty ratio mapping table of the preset thermostat can be queried by inputting the operating state parameters of the engine to obtain the basic duty ratio of the thermostat corresponding to the target water temperature.
For example: referring to fig. 3, when the target water temperatures are 95 ℃, 100 ℃, and 105 ℃, respectively, the target water temperatures query a fourth basic duty ratio mapping table, a fifth basic duty ratio mapping table, and a sixth basic duty ratio mapping table, which are preset corresponding to different target water temperatures, according to the engine load and the engine speed, so as to obtain basic duty ratios of thermostats corresponding to 95 ℃, 100 ℃, and 105 ℃.
The fourth basic duty ratio mapping table, the fifth basic duty ratio mapping table and the sixth basic duty ratio mapping table are the basic duty ratios of the thermostat under different engine loads and engine speeds when the target water temperature is 95 ℃, 100 ℃ and 105 ℃ respectively.
It is understood that the target water temperatures of 95 deg.c, 100 deg.c, and 105 deg.c are merely exemplary and may be set according to specific requirements.
S102: and calculating the difference value of the target water temperature and the actual water temperature.
Specifically, the target water temperature needs to be determined according to requirements under different working conditions of engine load and engine speed, vehicle speed and engine load, and vehicle speed and intake air temperature. As shown in fig. 3, the first mapping table, the second mapping table, and the third mapping table represent target water temperature corresponding tables for different working conditions. And inquiring three mapping tables according to the operating parameters of the engine and the vehicle speed so as to obtain the target water temperature.
For example: inquiring a first mapping table according to the engine load and the engine speed; inquiring a second mapping table according to the vehicle speed and the engine load; and inquiring a third mapping table according to the vehicle speed and the intake air temperature. And determining the target water temperature according to the query result, and further calculating to obtain the difference value between the target water temperature and the actual water temperature.
S103: and obtaining the duty ratio of the thermostat according to the basic duty ratio and the difference value of the thermostat.
After the difference value between the target water temperature and the actual water temperature is obtained, the difference value is controlled by a PID (Proportion integration differentiation) controller, and the duty ratio of the thermostat is obtained by combining the basic duty ratio of the thermostat determined according to the running state parameters of the engine.
S104: and obtaining the parameter value of the estimated duty ratio of the thermostat according to the running state parameter of the engine, the vehicle speed and the air conditioner switching signal.
Specifically, firstly, a seventh mapping table and an eighth mapping table need to be queried according to the intake air temperature and the vehicle speed respectively and in combination with an air conditioner switching signal to obtain an intake air temperature correction coefficient, as shown in fig. 3, the seventh mapping table is the estimated duty ratio of the thermostat corresponding to different intake air temperatures and vehicle speeds in the open state of the air conditioner, and the eighth mapping table is the estimated duty ratio of the thermostat corresponding to different intake air temperatures and vehicle speeds in the closed state of the air conditioner; then obtaining a flow correction coefficient according to the rotating speed of the engine; and finally, obtaining a parameter value of the estimated duty ratio of the thermostat according to the intake temperature correction coefficient and the flow correction coefficient.
S105: and obtaining the final duty ratio of the thermostat according to the duty ratio of the thermostat and the parameter value of the estimated duty ratio.
After the thermostat's duty cycle is obtained, it is not the thermostat duty cycle that is ultimately needed. In order to avoid the severe fluctuation of the water temperature of the engine or the rush to the temperature higher than the allowable water temperature of the engine, the final duty ratio of the thermostat can be obtained by combining the parameter value of the estimated duty ratio. The final duty ratio of the thermostat is controlled, so that the water temperature of an engine is ensured to meet the requirement of the working condition of the whole vehicle.
According to the control method of the thermostat, the duty ratio of the thermostat can be determined according to the basic duty ratio obtained by the running state parameters of the engine and the difference value between the target water temperature and the actual water temperature, the final duty ratio of the thermostat is determined by combining the parameter values of the estimated duty ratio obtained according to the running state parameters of the engine, the vehicle speed and the air conditioner switching signals, and then the situation that the water temperature of the engine fluctuates severely or rushes over the allowable water temperature of the engine after the thermostat is adopted is effectively solved through controlling the final duty ratio of the thermostat, so that the working stability of the engine is improved.
FIG. 2 is a block diagram of a control system for a thermostat according to one embodiment of the present invention. As shown in fig. 2, a control system 200 of a thermostat according to one embodiment of the present invention includes: a basic duty cycle determination module 210, a difference value calculation module 220, a duty cycle determination module 230, a parameter value determination module 240 of an estimated duty cycle, and a final duty cycle calculation module 250.
The basic duty ratio determining module 210 is configured to determine a basic duty ratio of the thermostat at a target water temperature of the engine according to operating state parameters of the engine, where the operating state parameters of the engine include an engine load, an engine speed, and an intake air temperature of the engine; the difference value calculating module 220 is used for calculating the difference value between the target water temperature and the actual water temperature; the duty cycle determining module 230 is configured to obtain a duty cycle of the thermostat according to the basic duty cycle of the thermostat and the difference; the pre-estimated duty ratio parameter value determination module 240 is used for obtaining a pre-estimated duty ratio parameter value of the thermostat according to the running state parameter of the engine, the vehicle speed and the air conditioner switching signal; the final duty ratio calculation module 250 is configured to obtain a final duty ratio of the thermostat according to the duty ratio of the thermostat and the parameter value of the estimated duty ratio.
In an embodiment of the present invention, the thermostat base duty cycle determination module 210 is configured to query a preset thermostat base duty cycle map according to the engine load and the engine speed to obtain a thermostat base duty cycle corresponding to the target water temperature.
In an embodiment of the present invention, before calculating the difference between the target water temperature and the actual water temperature, the difference calculating module 220 is further configured to query the first mapping table according to the engine load and the engine speed, query the second mapping table according to the vehicle speed and the engine load, query the third mapping table according to the vehicle speed and the intake air temperature, and determine the target water temperature according to the query result.
In an embodiment of the present invention, the estimated duty ratio parameter value determining module 240 is configured to obtain an intake air temperature correction coefficient according to the intake air temperature, the vehicle speed, and the air conditioner switching signal, obtain a flow correction coefficient according to the engine speed, and obtain an estimated duty ratio parameter value of the thermostat according to the intake air temperature correction coefficient and the flow correction coefficient.
In one embodiment of the invention, the thermostat is an electronic thermostat.
According to the control system of the thermostat, the duty ratio of the thermostat can be determined according to the basic duty ratio obtained by the running state parameters of the engine and the difference value between the target water temperature and the actual water temperature, the final duty ratio of the thermostat is determined by combining the parameter values of the estimated duty ratio obtained according to the running state parameters of the engine, the vehicle speed and the air conditioner switching signals, and then the situation that the water temperature of the engine fluctuates severely or rushes to be higher than the allowable water temperature of the engine after the thermostat is adopted is effectively solved through the control of the final duty ratio of the thermostat, so that the working stability of the engine is improved.
It should be noted that the specific implementation manner of the control system of the thermostat according to the embodiment of the present invention is similar to the specific implementation manner of the control method of the thermostat according to the embodiment of the present invention, and please refer to the description of the method part specifically, and details are not described here in order to reduce redundancy.
Further, an embodiment of the present invention discloses a vehicle, including: the control system of the thermostat according to the embodiments described above. The vehicle can determine the duty ratio of the thermostat according to the basic duty ratio obtained by the running state parameters of the engine and the difference value between the target water temperature and the actual water temperature, and determine the final duty ratio of the thermostat by combining the estimated duty ratio parameter values obtained by the running state parameters of the engine, the vehicle speed and the air conditioner switching signals, and then effectively solve the problem that the water temperature of the engine fluctuates severely or rises above the allowable water temperature of the engine after the thermostat is adopted by controlling the final duty ratio of the thermostat, so that the working stability of the engine is improved.
In addition, other functions and functions of the vehicle according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail in order to reduce redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control method of a thermostat is characterized by comprising the following steps:
determining a basic duty ratio of a thermostat at a target water temperature of an engine according to operating state parameters of the engine, wherein the operating state parameters of the engine comprise engine load, engine speed and air inlet temperature of the engine;
calculating the difference value between the target water temperature and the actual water temperature;
obtaining the duty ratio of the thermostat according to the basic duty ratio of the thermostat and the difference value;
obtaining a parameter value of the estimated duty ratio of the thermostat according to the running state parameter of the engine, the vehicle speed and an air conditioner switching signal;
and obtaining the final duty ratio of the thermostat according to the duty ratio of the thermostat and the parameter value of the estimated duty ratio.
2. The thermostat control method of claim 1, wherein the determining a base duty cycle of the thermostat at a target water temperature of the engine based on the operating state parameter of the engine comprises:
and inquiring a preset basic duty ratio mapping table of the thermostat according to the engine load and the engine speed so as to obtain the basic duty ratio of the thermostat corresponding to the target water temperature.
3. The thermostat control method according to claim 1, further comprising, before calculating the difference between the target water temperature and the actual water temperature:
inquiring a first mapping table according to the engine load and the engine speed, wherein the first mapping table comprises target water temperature values corresponding to the engine load and the engine speed;
inquiring a second mapping table according to the vehicle speed and the engine load, wherein the second mapping table comprises target water temperature values corresponding to the vehicle speed and the engine load;
inquiring a third mapping table according to the vehicle speed and the air inlet temperature, wherein the third mapping table comprises target water temperature values corresponding to the vehicle speed and the air inlet temperature;
and determining the target water temperature according to the query result.
4. The control method of the thermostat of claim 1, wherein the obtaining the parameter value of the estimated duty cycle of the thermostat according to the operating state parameter of the engine, the vehicle speed and the air conditioner switching signal comprises:
obtaining an air inlet temperature correction coefficient according to the air inlet temperature, the vehicle speed and an air conditioner switching signal;
obtaining a flow correction coefficient according to the rotating speed of the engine;
and obtaining a parameter value of the estimated duty ratio of the thermostat according to the intake temperature correction coefficient and the flow correction coefficient.
5. A control system for a thermostat, comprising:
the basic duty ratio determining module of the thermostat is used for determining the basic duty ratio of the thermostat at the target water temperature of the engine according to the running state parameters of the engine, wherein the running state parameters of the engine comprise engine load, engine rotating speed and air inlet temperature of the engine;
the difference value calculating module is used for calculating the difference value between the target water temperature and the actual water temperature;
the duty ratio determining module of the thermostat is used for obtaining the duty ratio of the thermostat according to the basic duty ratio of the thermostat and the difference value;
the estimated duty ratio parameter value determination module is used for obtaining the estimated duty ratio parameter value of the thermostat according to the running state parameter of the engine, the vehicle speed and the air conditioner switching signal;
and the final duty ratio calculation module is used for obtaining the final duty ratio of the thermostat according to the duty ratio of the thermostat and the parameter value of the estimated duty ratio.
6. The thermostat control system of claim 5, wherein the thermostat base duty cycle determination module is configured to query a preset thermostat base duty cycle map based on the engine load and engine speed to obtain the thermostat base duty cycle corresponding to the target water temperature.
7. The thermostat control system of claim 5, wherein the difference calculation module, prior to calculating the difference between the target water temperature and the actual water temperature, is further configured to query a first mapping table based on engine load and engine speed, query a second mapping table based on vehicle speed and engine load, query a third mapping table based on vehicle speed and intake air temperature, and determine the target water temperature based on the query result.
8. The control system of the thermostat of claim 5, wherein the estimated duty cycle parameter value determining module is configured to obtain an intake air temperature correction coefficient according to the intake air temperature, a vehicle speed, and an air conditioner switching signal, obtain a flow correction coefficient according to the engine speed, and obtain an estimated duty cycle parameter value of the thermostat according to the intake air temperature correction coefficient and the flow correction coefficient.
9. The thermostat of any one of claims 5-8, wherein the thermostat is an electronic thermostat.
10. A vehicle, characterized by comprising: a control system for a thermostat according to any of claims 5-9.
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| CN201910034197.3A CN111434902A (en) | 2019-01-15 | 2019-01-15 | Control method and system of thermostat and vehicle |
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| CN201910034197.3A CN111434902A (en) | 2019-01-15 | 2019-01-15 | Control method and system of thermostat and vehicle |
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| JPH06137148A (en) * | 1992-10-26 | 1994-05-17 | Nippondenso Co Ltd | Engine cooling device |
| KR101349071B1 (en) * | 2012-10-09 | 2014-01-09 | 기아자동차주식회사 | Engine cooling system of vehicle and method for controlling the same |
| CN106285907A (en) * | 2016-10-19 | 2017-01-04 | 潍柴动力股份有限公司 | The control method of a kind of engine temperature, Apparatus and system |
| CN107701288A (en) * | 2017-09-29 | 2018-02-16 | 安徽江淮汽车集团股份有限公司 | A kind of temperature control system and method |
| CN107893697A (en) * | 2017-11-24 | 2018-04-10 | 奇瑞汽车股份有限公司 | Electronic thermostat opening control method |
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2019
- 2019-01-15 CN CN201910034197.3A patent/CN111434902A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06137148A (en) * | 1992-10-26 | 1994-05-17 | Nippondenso Co Ltd | Engine cooling device |
| KR101349071B1 (en) * | 2012-10-09 | 2014-01-09 | 기아자동차주식회사 | Engine cooling system of vehicle and method for controlling the same |
| CN106285907A (en) * | 2016-10-19 | 2017-01-04 | 潍柴动力股份有限公司 | The control method of a kind of engine temperature, Apparatus and system |
| CN107701288A (en) * | 2017-09-29 | 2018-02-16 | 安徽江淮汽车集团股份有限公司 | A kind of temperature control system and method |
| CN107893697A (en) * | 2017-11-24 | 2018-04-10 | 奇瑞汽车股份有限公司 | Electronic thermostat opening control method |
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Application publication date: 20200721 |