CN114458437A - Water pump control method and device - Google Patents
Water pump control method and device Download PDFInfo
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- CN114458437A CN114458437A CN202210240234.8A CN202210240234A CN114458437A CN 114458437 A CN114458437 A CN 114458437A CN 202210240234 A CN202210240234 A CN 202210240234A CN 114458437 A CN114458437 A CN 114458437A
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- temperature
- engine
- water pump
- load
- water outlet
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
- F02B2043/103—Natural gas, e.g. methane or LNG used as a fuel
Abstract
The invention provides a water pump control method and a water pump control device, wherein when the load of an engine is larger than or equal to a preset value, the engine can be considered to be in a large load state, the first temperature can be used for controlling the water outlet quantity of an electronic water pump at the position where cooling water is discharged, when the load of the engine is smaller than the preset value, the engine can be considered to be in a small load state, the second temperature can be used for controlling the water outlet quantity of the electronic water pump at the position where the cooling water is discharged, and the second temperature is larger than the first temperature, so that a relatively weak cooling effect can be provided for the engine at a small load, a relatively strong cooling effect can be provided for the engine at a large load, the problem of insufficient combustion caused by too low temperature of a cylinder wall at the small load is avoided, and the problem of safety caused by too high temperature of the cylinder at the large load is solved.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a water pump control method and device.
Background
The natural gas engine is an engine using natural gas as fuel, and can be a power device for converting heat energy released during fuel combustion into mechanical energy, wherein the ignition type natural gas engine is widely applied, namely mixed natural gas is ignited by a spark plug. Aiming at a natural gas engine, a mechanical water pump is commonly used for cooling the engine at present, the mechanical water pump is driven by an engine crankshaft through a conveying rubber belt, the rotating speed of the mechanical water pump is in direct proportion to the rotating speed of the engine, hot water in a water channel of a cylinder body can be pumped out, and cold water is pumped in, so that the cooling effect is achieved.
However, such mechanical water pumps do not meet different cooling requirements under different loads.
Disclosure of Invention
In view of this, the present invention provides a method and a device for controlling a water pump, so that the water pump can meet different cooling requirements under different loads.
In order to realize the purpose, the invention has the following technical scheme:
the embodiment of the application provides a water pump control method, which comprises the following steps:
when the load of the engine is greater than or equal to a preset value, controlling the water yield of the electronic water pump by taking the first temperature as the target temperature of the cooling water outlet position;
when the load of the engine is smaller than a preset value, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet position; the second temperature is greater than the first temperature.
Optionally, when the load of the engine is greater than or equal to the preset value, controlling the water output of the electronic water pump by taking the first temperature as the target temperature of the cooling water outlet, including:
when the load of the engine is larger than or equal to a preset value, comparing the knocking frequency of the engine with a knocking limit value at least once, and when the knocking frequency of the engine is larger than the knocking limit value, controlling the water outlet quantity of the electronic water pump by taking the first temperature as the target temperature of the water outlet position of the cooling water.
Optionally, when the load of the engine is less than the preset value, controlling the water output of the electronic water pump by using the second temperature as the target temperature of the cooling water outlet, including:
and when the load of the engine is smaller than a preset value, comparing the exhaust temperature with the light-off temperature of the three-way catalyst at least once, and when the exhaust temperature is smaller than the light-off temperature of the three-way catalyst, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet.
Optionally, the first temperature range is [90 ℃, 95 ℃), and the second temperature range is [92 ℃, 97 ℃).
Optionally, the first temperature is 90 ℃ and the second temperature is 95 ℃.
The embodiment of the application provides a water pump control device, includes:
the first control unit is used for controlling the water yield of the electronic water pump by taking the first temperature as the target temperature of the cooling water outlet position when the load of the engine is greater than or equal to a preset value;
the second control unit is used for controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet position when the load of the engine is smaller than a preset value; the second temperature is greater than the first temperature.
Optionally, the first control unit is specifically configured to:
when the load of the engine is larger than or equal to a preset value, comparing the knocking frequency of the engine with a knocking limit value at least once, and when the knocking frequency of the engine is larger than the knocking limit value, controlling the water outlet quantity of the electronic water pump by taking the first temperature as the target temperature of the water outlet position of the cooling water.
Optionally, the second control unit is specifically configured to:
and when the load of the engine is smaller than a preset value, comparing the exhaust temperature with the light-off temperature of the three-way catalyst at least once, and when the exhaust temperature is smaller than the light-off temperature of the three-way catalyst, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet.
Optionally, the first temperature range is [90 ℃, 95 ℃), and the second temperature range is [92 ℃, 97 ℃).
Optionally, the first temperature is 90 ℃ and the second temperature is 95 ℃.
The embodiment of the application provides a water pump control method and a water pump control device, when the load of an engine is larger than or equal to a preset value, the engine can be considered to be in a large load state, the water outlet quantity of an electronic water pump can be controlled by taking a first temperature as a target temperature of a cooling water outlet, when the load of the engine is smaller than the preset value, the engine can be considered to be in a small load state, the water outlet quantity of the electronic water pump can be controlled by taking a second temperature as the target temperature of the cooling water outlet, the second temperature is larger than the first temperature, therefore, a relatively weak cooling effect can be provided for the engine when the engine is in a small load, a relatively strong cooling effect is provided for the engine when the engine is in a large load, the problem of insufficient combustion caused by too low temperature of a cylinder wall when the engine is in a small load is solved, and the problem of safety caused by too high temperature of the cylinder when the engine is in a large load is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a water pump control method according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a structure of a water pump control device according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
At present, a mechanical water pump is commonly used for cooling an engine aiming at a natural gas engine, the mechanical water pump is driven by an engine crankshaft through a conveying rubber belt, the rotating speed of the mechanical water pump is in direct proportion to the rotating speed of the engine, hot water in a cylinder water channel can be pumped out, and cold water is pumped in, so that the cooling effect is achieved.
However, such mechanical water pumps do not meet different cooling requirements under different loads. For example, when the load is low, the cooling water circulates to take away heat, when the cooling effect is strong, the cooling water enables the temperature of the cylinder wall to be low, fuel in the cylinder is not sufficiently combusted, the emission of methane (CH4) is increased, the exhaust temperature is low, the conversion efficiency of the three-way catalyst is low, and when the load is large, the exhaust temperature is high, and the safety is not good.
Based on this, the embodiment of the application provides a water pump control method and a water pump control device, when the load of an engine is greater than or equal to a preset value, the engine can be considered to be in a large load state, the water output of an electronic water pump can be controlled by taking a first temperature as a target temperature of a cooling water outlet, when the load of the engine is less than the preset value, the engine can be considered to be in a small load state, the water output of the electronic water pump can be controlled by taking a second temperature as the target temperature of the cooling water outlet, and the second temperature is greater than the first temperature, so that a relatively weak cooling effect can be provided for the engine at a small load, a relatively strong cooling effect can be provided for the engine at a large load, the problem of insufficient combustion caused by too low temperature of a cylinder wall at the small load and the problem of safety caused by too high temperature of the cylinder at the large load can be avoided.
In order to better understand the technical solutions and effects of the present invention, the following detailed descriptions of specific embodiments will be provided with reference to the accompanying drawings.
An embodiment of the present application provides a water pump control method, which is shown in fig. 1 and is a flowchart of the water pump control method provided in the embodiment of the present application, and the method may include:
s101, when the load of the engine is larger than or equal to a preset value, controlling the water yield of the electronic water pump by taking the first temperature as the target temperature of the cooling water outlet position;
and S102, when the load of the engine is smaller than a preset value, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet position.
In the embodiment of the application, the cooling water quantity of the engine can be controlled by utilizing the electronic water pump, the electronic water pump is controlled by the engine control unit through current, the electronic water pump is not influenced by the rotating speed of the engine, and the electronic water pump can flexibly work according to the actual cooling condition of the engine.
When the load of the engine is greater than or equal to a preset value, the engine can be considered to be in a large load state, the first temperature a can be a lower temperature as the target temperature of the cooling water outlet to control the water outlet amount of the electronic water pump, and when the load of the engine is less than the preset value, the engine can be considered to be in a small load state, the second temperature b can be a target temperature of the cooling water outlet to control the water outlet amount of the electronic water pump, and the second temperature b can be a higher temperature, namely the first temperature a is lower than the second temperature b. Therefore, the actual temperature of the cooling water outlet position under the heavy load is lower than that under the light load, so that the cooling effect of the engine under the heavy load is better, the working safety of the engine is improved, the cooling effect of the engine under the light load is weaker, the temperature of the cylinder is improved, and the combustion efficiency of fuel gas is improved.
Specifically, when the load of the engine is greater than or equal to a preset value, the temperature of the cooling water outlet can be controlled to be close to the first temperature a. In specific implementation, when the actual temperature of the cooling water outlet is higher than the first temperature a, the amount of the cooling water of the engine can be increased by controlling the electronic water pump so as to reduce the actual temperature of the cooling water outlet to be close to the first temperature a; when the actual temperature of the cooling water outlet is lower than the first temperature a, the amount of the cooling water of the engine can be reduced by controlling the electronic water pump, so that the actual temperature of the cooling water outlet is increased to be close to the first temperature a. In actual operation, the amount of change of the cooling water amount may be determined according to the difference between the actual temperature of the cooling water outlet and the first temperature a, and the difference between the actual temperature of the cooling water outlet and the first temperature a may be positively correlated with the amount of change of the cooling water amount.
Thus, the actual temperature x of the cooling water outlet can be ensured1Is maintained at a temperature close to the first temperature a, so that the temperature deviation is within the first control precision c, namely the actual temperature x of the cooling water outlet1In the range of [ a-c, a + c]Can also be expressed as | x1C is less than or equal to alpha |, so that the cooling effect of the engine is ensured, the heat taken away by cooling water is reduced as much as possible, the temperature of the cylinder wall is ensured, and the heat efficiency of the engine can be effectively improvedThe exhaust temperature is increased, the CH4 is reduced, the conversion efficiency of the three-way catalyst is improved, and the economy can be improved to a certain extent.
Specifically, when the load of the engine is less than a preset value, the temperature of the cooling water outlet can be controlled to be close to the second temperature b. In specific implementation, when the actual temperature of the cooling water outlet is higher than the second temperature b, the amount of the cooling water of the engine can be increased by controlling the electronic water pump so as to reduce the actual temperature of the cooling water outlet to be close to the second temperature b; when the actual temperature of the cooling water outlet is lower than the second temperature b, the amount of the cooling water of the engine can be reduced by controlling the electronic water pump, so that the actual temperature of the cooling water outlet is increased to be close to the second temperature b. In actual operation, the amount of change of the cooling water amount may be determined according to the difference between the actual temperature of the cooling water outlet and the second temperature b, and the difference between the actual temperature of the cooling water outlet and the second temperature b may be positively correlated to the amount of change of the cooling water amount.
Thus, the actual temperature x of the cooling water outlet can be ensured2Is maintained at a temperature close to the second temperature b, so that the temperature deviation is within the second control precision d, namely the actual temperature x of the cooling water outlet2In the range of [ b-d, b + d]Can also be expressed as | x2D is less than or equal to-b |, the heat load of the engine is reduced, the detonation tendency is effectively reduced, and the exhaust temperature is reduced. The first control accuracy c and the second control accuracy d may be the same or different.
In the embodiment of the present application, the first temperature may be in a range of [90 ℃, 95 ℃), so that the thermal load is reduced and the knocking is reduced under a large load, for example, the first temperature may be 90 ℃; the second temperature may be in the range of [92 ℃, 97 ℃) so that the engine can quickly heat the vehicle and raise the exhaust temperature, for example, the second temperature may be 95 ℃.
In the embodiment of the application, when the load of the engine is smaller than the preset value, the exhaust temperature and the light-off temperature of the three-way catalyst can be compared at least once, and when the exhaust temperature is smaller than the light-off temperature of the three-way catalyst, the second temperature is used as the target temperature of the cooling water outlet to control the water yield of the electronic water pump. And when the exhaust temperature is determined to be greater than or equal to the light-off temperature of the three-way catalyst, the control of the water yield of the electronic water pump can be omitted.
For example, when the load of the engine is less than a preset value, it may be determined whether the exhaust temperature is less than the light-off temperature of the three-way catalyst, if not, the water yield of the electronic water pump may not be controlled, and if so, the water yield of the electronic water pump may be controlled by using the second temperature as the target temperature of the cooling water outlet, for example, the water yield of the electronic water pump may be adjusted by a certain step length; then, judging whether the exhaust temperature is lower than the light-off temperature of the three-way catalyst again, if not, not controlling the water yield of the electronic water pump, and if so, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet; thereafter, it may be determined again whether the exhaust temperature is less than the three-way catalyst light-off temperature, and so on.
In the embodiment of the application, when the load of the engine is greater than or equal to the preset value, at least one comparison between the engine knock frequency and the knock limit value can be carried out, and when the engine knock frequency is greater than the knock limit value, the first temperature is used as the target temperature of the cooling water outlet to control the water outlet quantity of the electronic water pump. And when the engine knocking frequency is determined to be less than or equal to the knocking limit value, the control of the water yield of the electronic water pump can be omitted.
For example, when the load of the engine is greater than or equal to a preset value, it may be determined whether the knocking frequency of the engine is greater than a knocking limit value, if so, the water output of the electronic water pump may not be controlled, and if so, the water output of the electronic water pump may be controlled by using the first temperature as the target temperature of the cooling water outlet, for example, the water output of the electronic water pump may be adjusted by a certain step length; then, whether the engine knocking frequency is larger than the knocking limit value or not can be judged again, if yes, the water yield of the electronic water pump can not be controlled, and if yes, the water yield of the electronic water pump is controlled by taking the first temperature as the target temperature of the cooling water outlet position; thereafter, it may be determined again whether the engine knock frequency is greater than the knock limit, and so on.
The embodiment of the application provides a water pump control method, when the load of an engine is larger than or equal to a preset value, the engine can be considered to be in a large load state, the first temperature can be used as the target temperature of a cooling water outlet to control the water outlet amount of an electronic water pump, when the load of the engine is smaller than the preset value, the engine can be considered to be in a small load state, the second temperature can be used as the target temperature of the cooling water outlet to control the water outlet amount of the electronic water pump, and the second temperature is larger than the first temperature, so that a relatively weak cooling effect can be provided for the engine when the engine is in a small load state, a relatively strong cooling effect is provided for the engine when the engine is in a large load state, the problem of insufficient combustion caused by too low temperature of a cylinder wall when the engine is in a small load state is solved, and the problem of safety caused by too high temperature of the cylinder when the engine is in a large load state is solved.
Based on the water pump control method provided by the embodiment of the present application, an embodiment of the present application further provides a water pump control device, and referring to fig. 2, for a structural block diagram of the water pump control device provided by the embodiment of the present application, the device may include:
the first control unit 110 is used for controlling the water yield of the electronic water pump by taking the first temperature as the target temperature of the cooling water outlet position when the load of the engine is greater than or equal to a preset value;
the second control unit 120 is used for controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet position when the load of the engine is smaller than the preset value; the second temperature is greater than the first temperature.
Optionally, the first control unit is specifically configured to:
when the load of the engine is larger than or equal to a preset value, comparing the knocking frequency of the engine with a knocking limit value at least once, and when the knocking frequency of the engine is larger than the knocking limit value, controlling the water outlet quantity of the electronic water pump by taking the first temperature as the target temperature of the water outlet position of the cooling water.
Optionally, the second control unit is specifically configured to:
and when the load of the engine is smaller than a preset value, comparing the exhaust temperature with the light-off temperature of the three-way catalyst at least once, and when the exhaust temperature is smaller than the light-off temperature of the three-way catalyst, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet.
Optionally, the first temperature range is [90 ℃, 95 ℃), and the second temperature range is [92 ℃, 97 ℃).
Optionally, the first temperature is 90 ℃ and the second temperature is 95 ℃.
The embodiment of the application provides a water pump control device, when the load of an engine is greater than or equal to a preset value, the engine can be considered to be in a large load state, the water output of an electronic water pump can be controlled by taking a first temperature as a target temperature of a cooling water outlet, when the load of the engine is smaller than the preset value, the engine can be considered to be in a small load state, the water output of the electronic water pump can be controlled by taking a second temperature as the target temperature of the cooling water outlet, the second temperature is greater than the first temperature, so that a relatively weak cooling effect can be provided for the engine when the engine is in a small load state, a relatively strong cooling effect is provided for the engine when the engine is in a large load state, the problem of insufficient combustion caused by too low temperature of a cylinder wall when the engine is in a small load state is avoided, and the problem of safety caused by too high temperature of the cylinder when the engine is in a large load state is solved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The foregoing is only a preferred embodiment of the present invention, and although the present invention has been disclosed in the preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. A water pump control method, comprising:
when the load of the engine is greater than or equal to a preset value, controlling the water yield of the electronic water pump by taking the first temperature as the target temperature of the cooling water outlet position;
when the load of the engine is smaller than a preset value, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet position; the second temperature is greater than the first temperature.
2. The method according to claim 1, wherein when the load of the engine is greater than or equal to a preset value, controlling the water output of the electronic water pump with the first temperature as the target temperature of the cooling water outlet comprises:
when the load of the engine is larger than or equal to a preset value, comparing the knocking frequency of the engine with a knocking limit value at least once, and when the knocking frequency of the engine is larger than the knocking limit value, controlling the water outlet quantity of the electronic water pump by taking the first temperature as the target temperature of the water outlet position of the cooling water.
3. The method according to claim 2, wherein when the load of the engine is less than a preset value, controlling the water output of the electronic water pump with the second temperature as the target temperature of the cooling water outlet comprises:
and when the load of the engine is smaller than a preset value, comparing the exhaust temperature with the light-off temperature of the three-way catalyst at least once, and when the exhaust temperature is smaller than the light-off temperature of the three-way catalyst, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet.
4. The method of any one of claims 1-3, wherein the first temperature is in the range of [90 ℃, 95 ℃), and the second temperature is in the range of [92 ℃, 97 ℃).
5. The method of claim 4, wherein the first temperature is 90 ℃ and the second temperature is 95 ℃.
6. A water pump control apparatus, comprising:
the first control unit is used for controlling the water yield of the electronic water pump by taking the first temperature as the target temperature of the cooling water outlet position when the load of the engine is greater than or equal to a preset value;
the second control unit is used for controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet position when the load of the engine is smaller than a preset value; the second temperature is greater than the first temperature.
7. The apparatus according to claim 6, wherein the first control unit is specifically configured to:
when the load of the engine is larger than or equal to a preset value, comparing the knocking frequency of the engine with a knocking limit value at least once, and when the knocking frequency of the engine is larger than the knocking limit value, controlling the water outlet quantity of the electronic water pump by taking the first temperature as the target temperature of the water outlet position of the cooling water.
8. The apparatus according to claim 7, wherein the second control unit is specifically configured to:
and when the load of the engine is smaller than a preset value, comparing the exhaust temperature with the light-off temperature of the three-way catalyst at least once, and when the exhaust temperature is smaller than the light-off temperature of the three-way catalyst, controlling the water yield of the electronic water pump by taking the second temperature as the target temperature of the cooling water outlet.
9. The apparatus of any of claims 6-8, wherein the first temperature is in the range of [90 ℃, 95 ℃), and the second temperature is in the range of [92 ℃, 97 ℃).
10. The apparatus of claim 9, wherein the first temperature is 90 ℃ and the second temperature is 95 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210240234.8A CN114458437A (en) | 2022-03-10 | 2022-03-10 | Water pump control method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210240234.8A CN114458437A (en) | 2022-03-10 | 2022-03-10 | Water pump control method and device |
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| CN114458437A true CN114458437A (en) | 2022-05-10 |
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| CN202210240234.8A Pending CN114458437A (en) | 2022-03-10 | 2022-03-10 | Water pump control method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115242022A (en) * | 2022-06-23 | 2022-10-25 | 北京博威能源科技股份有限公司 | Generating set system suitable for kitchen waste |
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| CN111520227A (en) * | 2020-05-08 | 2020-08-11 | 蜂巢动力系统(江苏)有限公司 | Control method of electronic water pump of engine |
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| JP2001207846A (en) * | 2000-01-20 | 2001-08-03 | Denso Corp | Cooling system for liquid-cooled internal combustion engine |
| JP2012102639A (en) * | 2010-11-09 | 2012-05-31 | Daihatsu Motor Co Ltd | Engine cooling system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115242022A (en) * | 2022-06-23 | 2022-10-25 | 北京博威能源科技股份有限公司 | Generating set system suitable for kitchen waste |
| CN115242022B (en) * | 2022-06-23 | 2023-02-28 | 北京博威能源科技股份有限公司 | Generating set system suitable for kitchen waste |
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