CN112555007A - Control method of engine fan, electronic control unit and automobile - Google Patents
Control method of engine fan, electronic control unit and automobile Download PDFInfo
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- CN112555007A CN112555007A CN202011423272.4A CN202011423272A CN112555007A CN 112555007 A CN112555007 A CN 112555007A CN 202011423272 A CN202011423272 A CN 202011423272A CN 112555007 A CN112555007 A CN 112555007A
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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
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/08—Controlling of coolant flow the coolant being cooling-air by cutting in or out of pumps
- F01P7/081—Controlling of coolant flow the coolant being cooling-air by cutting in or out of pumps using clutches, e.g. electro-magnetic or induction clutches
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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
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/026—Thermostatic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/08—Temperature
- F01P2025/50—Temperature using two or more temperature sensors
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a control method of an engine fan, an electronic control unit and an automobile, wherein the method comprises the following steps: acquiring a real-time water temperature value of the engine and a real-time intake air temperature after the engine is supercharged and intercooled; and when the real-time water temperature value or the real-time air inlet temperature meets the preset fan starting control condition, controlling the fan to start. The invention controls the opening of the fan through the water temperature value and the intake air temperature after intercooling, avoids excessive emission and can also radiate the heat of the engine in time.
Description
Technical Field
The invention relates to the field of vehicle control, in particular to a control method of an engine fan, an electronic control unit and an automobile.
Background
The engine fan is installed between the engine and the radiator, when the water temperature of the engine exceeds the limit, the fan is opened, the blades rotate to generate high-speed airflow, and therefore heat is taken away to achieve the purpose of cooling. However, with the implementation of the pollutant emission standard of motor vehicles in the sixth stage of the country, the requirement on the automobile emission is more and more strict, and if the on-off of the fan is controlled only by the water temperature, the emission of the engine can be over-limited.
Disclosure of Invention
The invention mainly aims to provide a control method of an engine fan, an electronic control unit and an automobile, and aims to solve the technical problem that the emission of the engine is easily over-limited because the on-off of the fan is controlled only by water temperature at present.
In order to achieve the above object, the present invention provides a method for controlling an engine fan, comprising the steps of:
acquiring a real-time water temperature value of the engine and a real-time intake air temperature after the engine is supercharged and intercooled;
and when the real-time water temperature value or the real-time air inlet temperature meets the preset fan starting control condition, controlling the fan to start.
Optionally, after the step of controlling the fan to start, the method further includes:
and when the real-time water temperature value and the real-time air inlet temperature both accord with preset fan closing control conditions, controlling the fan to be closed.
Optionally, the real-time water temperature value meets a preset fan starting control condition that the real-time water temperature value is higher than a first preset water temperature limit value.
Optionally, the real-time intake air temperature meets a preset fan start control condition that the real-time intake air temperature is higher than a first preset temperature limit value.
Optionally, the real-time water temperature value and the real-time intake air temperature both meet preset fan turn-off control conditions that the real-time water temperature value is lower than a second preset water temperature limit value and the real-time intake air temperature is lower than a second preset temperature limit value, the second preset water temperature limit value is smaller than the first preset water temperature limit value, and the second preset temperature limit value is smaller than the first preset temperature limit value.
Optionally, the engine is a diesel engine or a gasoline engine.
Optionally, the step of controlling the fan to be turned off includes:
and outputting a control signal to control the temperature control switch to be switched off so that the temperature control switch outputs an electromagnetic clutch switching-off signal to enable the electromagnetic clutch to separately control the fan to be switched off.
Optionally, the step of controlling the fan to start includes:
and outputting a control signal to control the temperature control switch to be conducted so that the temperature control switch outputs an electromagnetic clutch actuation signal to enable the electromagnetic clutch to actuate and trigger the fan to be started.
Furthermore, in order to achieve the above object, the present invention also provides an electronic control unit comprising a memory, a processor and a computer program stored on the memory and operable on the processor, the computer program, when executed by the processor, implementing the steps of the method of controlling an engine fan as described above.
Further, to achieve the above object, the present invention also provides an automobile including an electronic control unit, an engine, and a fan, the electronic control unit implementing the steps of the control method of the engine fan as described above when performing engine fan control, or the electronic control unit being configured as the electronic control unit as described above.
According to the control method of the engine fan, the electronic control unit and the automobile, the real-time water temperature value of the engine and the real-time intake air temperature after the engine is supercharged and intercooled are obtained; and when the real-time water temperature value or the real-time air inlet temperature meets the preset fan starting control condition, controlling the fan to start. The opening of the fan is controlled through the water temperature value and the intake air temperature after intercooling, the problem that the engine power is influenced by overhigh intercooling temperature along with the running of the engine, so that the emission is excessive is solved, and the engine can be timely cooled.
Drawings
FIG. 1 is a schematic diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram illustrating a first exemplary embodiment of a method for controlling an engine fan according to the present invention;
fig. 3 is a flowchart illustrating a control method of an engine fan according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of an electronic control unit provided in the present invention. The Electronic Control Unit (ECU) is also called a traveling computer or a vehicle-mounted computer, and is a Control center of the automobile. The automobile can take diesel oil as an engine power source, correspondingly comprises a diesel engine (hereinafter referred to as a diesel engine for short), and also can take gasoline as an engine power source, correspondingly comprises a gasoline engine (hereinafter referred to as a gasoline engine for short); alternatively, the vehicle may be a hybrid vehicle that includes a power plant that is a diesel or gasoline engine. The electronic control unit may comprise components such as a communication module 10, a memory 20, and a processor 30. In the electronic control unit, the processor 30 is connected to the memory 20 and the communication module 10, respectively, the memory 20 having stored thereon a computer program that is executed by the processor 30 at the same time, the computer program implementing the steps of the method embodiments described below when executed.
The communication module 10 may be connected to an external communication device through a network. The communication module 10 may receive a request from an external communication device, and may also send a request, an instruction, and information to the external communication device. The external communication equipment can be other vehicle-mounted units or external control terminals.
The memory 20 may be used to store software programs as well as various data. The memory 20 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as an output control signal) required for at least one function, and the like; the storage data area may include a database, and the storage data area may store data or information created according to the use of the electronic control unit, or the like. Further, the memory 20 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 30, which is a control center of the electronic control unit, connects various parts of the entire electronic control unit using various interfaces and lines, and performs various functions of the electronic control unit and processes data by operating or executing software programs and/or modules stored in the memory 20 and calling data stored in the memory 20, thereby integrally monitoring the electronic control unit. Processor 30 may include one or more processing units; alternatively, the processor 30 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 30.
Although not shown in fig. 1, the electronic control unit may further include a power control module for connecting with a power source to ensure the normal operation of other components. Those skilled in the art will appreciate that the electronic control unit configuration shown in FIG. 1 does not constitute a limitation of the electronic control unit, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
Based on the hardware structure, various embodiments of the method of the invention are provided.
Referring to fig. 2, in the first embodiment of the control method of the engine fan of the present invention, the steps are included:
step S10, acquiring a real-time water temperature value of the engine and a real-time intake air temperature after the engine is supercharged and intercooled;
and step S20, when the real-time water temperature value or the real-time air inlet temperature accords with a preset fan starting control condition, controlling the fan to start.
The engine can be a diesel engine or a gasoline engine, and the following scheme specifically explains that the engine is a diesel engine.
In this embodiment, the water temperature of the diesel engine can be measured in real time or at regular time through the water temperature sensor, the intake air temperature after intercooling is measured in real time or at regular time through the temperature sensor after the engine is supercharged and intercooled, then the water temperature sensor and the temperature sensor output the corresponding measured water temperature signal and the corresponding measured temperature signal after intercooling to the ECU, and the ECU obtains the real-time water temperature value and the real-time intake air temperature after supercharging and intercooling by reading the water temperature signal and the temperature signal after intercooling.
The scheme is characterized in that fan starting control conditions are preset, the conditions are related to two parameters of a real-time water temperature value and a real-time air inlet temperature, and when any one of the parameters meets the fan starting control conditions, an engine fan is started. It should be noted that the fan used in the present scheme is an electromagnetic fan, and the actuation and the separation of the electromagnetic clutch are automatically controlled by the temperature control switch, so that the electromagnetic fan is correspondingly started and stopped. When the fan is controlled to start, the ECU outputs a control signal, the temperature control switch is switched on, and the temperature control switch outputs an electromagnetic clutch actuation signal to actuate the electromagnetic clutch so as to control the fan to open and radiate heat for the diesel engine.
The diesel engine fan is arranged between the diesel engine and the radiator, and the high-speed airflow generated after the fan is started can take away the heat in the radiator and the intercooler by jointly deciding the inlet air temperature after intercooling and the engine water temperature value to control the fan to start, so that the purposes of cooling the circulating water of the diesel engine and the inlet air after supercharging and intercooling are achieved, and the inlet air temperature after supercharging and intercooling of the engine is in an ideal range. Compared with the prior art, the scheme has the advantages that the water temperature value and the intake air temperature after intercooling are used for participating in the fan starting decision, when the water temperature sensor breaks down and the ECU reading temperature is lower than the actual water temperature, the engine is timely cooled by means of the intake air temperature after intercooling, the engine is prevented from being damaged by cylinder scuffing, and the engine is ensured to run more reliably. In addition, the intercooling temperature participates in starting the fan to enable the intercooling temperature to be reasonably and effectively controlled, the regeneration temperature of a DPF (Diesel Particulate Filter) and the conversion efficiency of SCR (Selective Catalytic Reduction) are improved, and the risk of emission over-limit is reduced. On the other hand, the control logic of the engine fan is optimized, the structure of the engine fan is not changed, and the hardware cost of the automobile is not increased.
Further, with continuing reference to fig. 2, after step S20, the following steps may be further included:
and step S30, controlling the fan to be closed when the real-time water temperature value and the real-time air inlet temperature both accord with preset fan closing control conditions.
It can be understood that, along with the operation of the electromagnetic fan, the heat dissipation effect is gradually improved, the water temperature is reduced, the air inlet temperature is also reduced, the real-time water temperature value and the real-time air inlet temperature after inter-cooling can be continuously detected and read, and whether the condition of closing the fan is met or not is confirmed. It should be noted that, when the intake air temperature is too high after intercooling, the charging efficiency is reduced, and the diesel engine power is affected; the water temperature is too high, the heat dissipation effect of the engine is poor, and the performance of the diesel engine is influenced, so that the fan is controlled to be closed only when the real-time water temperature value and the real-time air inlet temperature meet the fan closing control condition when the fan is closed, and the running performance of the diesel engine type engine is guaranteed to the maximum extent.
When the fan is controlled to be turned off, the ECU outputs a control signal to control the temperature control switch to be turned off, so that the temperature control switch outputs a turn-off signal of the electromagnetic clutch, the electromagnetic clutch is separated, and the fan is turned off. According to the scheme, after the fan is started, the water temperature value and the effect of the intake air temperature after intercooling are fully considered, the fan closing condition is reasonably designed, the fan operation duration is shortened, and energy is saved. In addition, with the advance of time, the intercooling temperature is also gradually reduced because of the start of the fan, but the intercooling temperature is too low, so that the intake temperature of the engine is low, the combustion temperature and the exhaust temperature of the engine can be influenced, the DPF regeneration temperature and the SCR conversion efficiency are influenced, the intercooling temperature participates in controlling the close of the fan, the intake temperature after intercooling can be controlled within a reasonable range, and the DPF regeneration temperature and the SCR conversion efficiency are ensured.
Further, referring to fig. 3, a second embodiment of the control method of the engine fan of the present invention is proposed based on the first embodiment of the control method of the engine fan of the present invention, which, in the present embodiment, comprises the steps of:
step S10, acquiring a real-time water temperature value of the engine and a real-time intake air temperature after the engine is supercharged and intercooled;
step S41, judging whether the real-time water temperature value is higher than a first preset water temperature limit value or whether the real-time air inlet temperature is higher than a first preset temperature limit value;
step S42, when the real-time water temperature value is higher than a first preset water temperature limit value, or when the real-time air inlet temperature is higher than a first preset temperature limit value, controlling the fan to start;
step S31, judging whether the real-time water temperature value is lower than a second preset water temperature limit value and whether the real-time air inlet temperature is lower than a second preset temperature limit value, wherein the second preset water temperature limit value is smaller than the first preset water temperature limit value, and the second preset temperature limit value is smaller than the first preset temperature limit value;
and step S32, when the real-time water temperature value is lower than a second preset water temperature limit value and the real-time air inlet temperature is lower than a second preset temperature limit value, controlling the fan to be closed.
In this embodiment, the fan start-up control condition and the fan shut-down control condition are limited, wherein the fan start-up control condition is divided into two conditions, the first condition is that the real-time water temperature value is higher than the first preset water temperature limit value, the second condition is that the real-time intake air temperature is higher than the first preset temperature limit value, and the fan start-up can be controlled when any one of the two conditions is met; otherwise, if the starting conditions of the two fans are not satisfied, the adjustment is not performed, and the ECU can continue to acquire the real-time water temperature value and the real-time air inlet temperature. And the fan closing control conditions are that the real-time water temperature value is lower than a second preset water temperature limit value and the real-time air inlet temperature is lower than a second preset temperature limit value. When the real-time water temperature value is not lower than the second preset water temperature limit value or the real-time air inlet temperature is not lower than the second preset temperature limit value, the fan closing control condition is not established, the fan keeps running, and the ECU can continuously read the real-time water temperature value and the real-time air inlet temperature.
The ranges of the first preset water temperature limit, the second preset water temperature limit, the first preset temperature limit and the second preset temperature limit may be set according to different characteristics or models of the engine, for example, the range of the first preset water temperature limit is 97 ℃ to 100 ℃, and preferably, the range of the first preset water temperature limit is 98 ℃; the second preset water temperature limit is in the range of 86 ℃ to 90 ℃, and preferably, the second preset water temperature may be 88 ℃. A first preset temperature limit in the range of 63 ℃ to 67 ℃, preferably a first preset temperature limit of 65 ℃; the second preset temperature limit may range from 55 ℃ to 59 ℃, preferably the second preset temperature limit is 57 ℃.
Taking the above preferred limit values as an example, in implementation, the ECU reads a real-time water temperature value and a real-time intake air temperature, and when the real-time water temperature value is determined to be higher than 98 ℃, or the real-time intake air temperature after intercooling is determined to be higher than 65 ℃, the ECU outputs a control signal, the temperature control switch closes the conduction circuit, and the electromagnetic clutch actuates the fan to open. And (3) with the operation of the fan, the water temperature and the intake air temperature are reduced, if the ECU confirms that the real-time water temperature value is lower than 88 ℃, and simultaneously the real-time intake air temperature after intercooling is lower than 57 ℃, the ECU outputs a control signal to control the temperature control switch to be switched off, and the electromagnetic clutch separating fan is switched off.
According to the scheme, the condition of closing and opening the fan is limited, so that the aim of reducing the water temperature of the engine can be fulfilled under the condition that a hardware structure is not changed, the temperature after inter-cooling can be controlled within a reasonable range, and the aim of reducing the emission risk is fulfilled. When the water temperature sensor of the diesel engine or the temperature sensor after intercooling fails, the fan can be ensured not to be in a runaway state,
in addition, the embodiment of the invention also provides an automobile which comprises an electronic control unit, an engine and a fan, wherein the electronic control unit can realize all the schemes of the embodiment when the engine fan is controlled. It should be understood that, since the electronic control unit of the embodiment adopts the technical solution of the control method of the engine fan, the automobile has all the advantages of the embodiment.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. The computer-readable storage medium may be the Memory 20 in fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several instructions for enabling a terminal device (which may be an automobile, a smart television, a mobile phone, a computer, a server, or a network device) having a processor to execute the method according to the embodiments of the present invention.
The specific embodiment of the computer readable storage medium of the present invention is substantially the same as the embodiments of the control method of the engine fan, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or server that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or server. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or service that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method of controlling an engine fan, comprising the steps of:
acquiring a real-time water temperature value of the engine and a real-time intake air temperature after the engine is supercharged and intercooled;
and when the real-time water temperature value or the real-time air inlet temperature meets the preset fan starting control condition, controlling the fan to start.
2. The method of claim 1, wherein the step of controlling the fan to start is followed by:
and when the real-time water temperature value and the real-time air inlet temperature both accord with preset fan closing control conditions, controlling the fan to be closed.
3. The method of claim 2, wherein the real-time water temperature value meets a predetermined fan start control condition that the real-time water temperature value is higher than a first predetermined water temperature limit.
4. The method of claim 3, wherein the real-time inlet air temperature meeting a predetermined fan activation control condition is the real-time inlet air temperature being above a first predetermined temperature limit.
5. The method of claim 4, wherein the real-time water temperature value and the real-time inlet air temperature both meet predetermined fan off control conditions that the real-time water temperature value is less than a second predetermined water temperature limit and the real-time inlet air temperature is less than a second predetermined temperature limit, the second predetermined water temperature limit being less than the first predetermined water temperature limit and the second predetermined temperature limit being less than the first predetermined temperature limit.
6. The method of claim 1, wherein the engine is a diesel or gasoline engine.
7. The method of any one of claims 2 to 6, wherein the step of controlling the fan to turn off comprises:
and outputting a control signal to control the temperature control switch to be switched off so that the temperature control switch outputs an electromagnetic clutch switching-off signal to enable the electromagnetic clutch to separately control the fan to be switched off.
8. The method of any one of claims 1 to 6, wherein the step of controlling the activation of the fan comprises:
and outputting a control signal to control the temperature control switch to be conducted so that the temperature control switch outputs an electromagnetic clutch actuation signal to enable the electromagnetic clutch to actuate and trigger the fan to be started.
9. An electronic control unit, characterized in that it comprises a memory, a processor and a computer program stored on said memory and executable on said processor, said computer program, when executed by said processor, implementing the steps of the control method of the engine fan according to any one of claims 1 to 8.
10. An automobile characterized by comprising an electronic control unit, an engine, and a fan, the electronic control unit implementing the steps of the control method of the engine fan according to any one of claims 1 to 8 when performing engine fan control, or the electronic control unit being configured as the electronic control unit according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011423272.4A CN112555007A (en) | 2020-12-08 | 2020-12-08 | Control method of engine fan, electronic control unit and automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011423272.4A CN112555007A (en) | 2020-12-08 | 2020-12-08 | Control method of engine fan, electronic control unit and automobile |
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| CN111485986A (en) * | 2020-03-26 | 2020-08-04 | 潍柴动力股份有限公司 | Control method and control device for engine cooling system and engine cooling system |
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| CN101377148A (en) * | 2007-08-31 | 2009-03-04 | 通用汽车环球科技运作公司 | System for cooling engine electronics |
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Application publication date: 20210326 |