CN109372644B - Engine thermal protection method and device - Google Patents
Engine thermal protection method and device Download PDFInfo
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- CN109372644B CN109372644B CN201811275481.1A CN201811275481A CN109372644B CN 109372644 B CN109372644 B CN 109372644B CN 201811275481 A CN201811275481 A CN 201811275481A CN 109372644 B CN109372644 B CN 109372644B
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- temperature
- engine
- preset
- water temperature
- preset protection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
Abstract
The invention discloses a method and a device for thermal protection of an engine, wherein the method comprises the following steps: acquiring the actual water temperature of an engine; judging whether the actual water temperature is greater than a first preset protection temperature or not; if so, enabling the engine to enter a high-temperature operation mode, wherein the high-temperature operation mode is a mode in which the EGR rate of the engine is smaller than a preset value. According to the engine thermal protection method, the actual water temperature of the engine is compared with the first preset protection temperature, when the actual water temperature is higher than the first preset protection temperature, the engine enters a high-temperature operation mode, the high-temperature operation mode is a mode that the EGR rate of the engine is lower than a preset value, when the EGR rate of the engine is reduced and is lower than the preset value, the heat carried by the EGR cooler is also greatly reduced, the heat dissipation requirement of a finished automobile is greatly reduced, and the further increase of the water temperature of the engine is effectively delayed or prevented.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a method and a device for thermal protection of an engine.
Background
With the continuous development of science and technology, various automobiles are widely applied to daily life and industry of people, and great convenience is brought to the life of people.
The vehicle obviously cannot be operated without the engine, but a large amount of heat is generated during the operation of the engine, and the engine is damaged when the water temperature is continuously increased.
However, in the existing thermal protection method for the engine, when the water temperature of the engine exceeds a certain temperature, the engine stops running, so that the normal running of the vehicle is influenced, and the driving comfort is reduced.
Disclosure of Invention
In view of the above, in order to solve the above problems, the present invention provides a method and a device for thermal protection of an engine, the technical scheme is as follows:
a method of engine thermal protection, the method comprising:
acquiring the actual water temperature of an engine;
judging whether the actual water temperature is greater than a first preset protection temperature or not;
if so, enabling the engine to enter a high-temperature operation mode, wherein the high-temperature operation mode is a mode in which the EGR rate of the engine is smaller than a preset value.
Preferably, the method further comprises:
acquiring the high-temperature operation water temperature in the high-temperature operation mode;
judging whether the high-temperature operation water temperature is greater than a second preset protection temperature or not;
if yes, alarming;
wherein the second preset protection temperature is greater than the first preset protection temperature.
Preferably, the method further comprises:
judging whether the high-temperature operation water temperature is greater than a third preset protection temperature or not;
if so, controlling the running state of the engine so as to enable the torque of the engine to be smaller than a preset value;
wherein the third preset protection temperature is greater than the second preset protection temperature.
An engine thermal protection device, the device comprising:
the first acquisition module is used for acquiring the actual water temperature of the engine;
the first judgment module is used for judging whether the actual water temperature is greater than a first preset protection temperature or not; if yes, triggering a first execution module;
the first execution module is used for enabling the engine to enter a high-temperature operation mode, wherein the high-temperature operation mode is a mode that an engine EGR rate is smaller than a preset value.
Preferably, the apparatus further comprises:
the second acquisition module is used for acquiring the high-temperature operation water temperature in the high-temperature operation mode;
the second judgment module is used for judging whether the high-temperature operation water temperature is greater than a second preset protection temperature or not; if yes, triggering a second execution module;
the second execution module is used for alarming;
wherein the second preset protection temperature is greater than the first preset protection temperature.
Preferably, the apparatus further comprises:
the third judgment module is used for judging whether the high-temperature operation water temperature is greater than a third preset protection temperature or not; if yes, triggering the third execution module;
the third execution module is used for controlling the running state of the engine so as to enable the torque of the engine to be smaller than a preset value;
wherein the third preset protection temperature is greater than the second preset protection temperature.
Compared with the prior art, the invention has the following beneficial effects:
according to the engine thermal protection method, the actual water temperature of the engine is compared with the first preset protection temperature, when the actual water temperature is higher than the first preset protection temperature, the engine enters a high-temperature operation mode, the high-temperature operation mode is a mode that the EGR rate of the engine is lower than a preset value, when the EGR rate of the engine is reduced and is lower than the preset value, the heat carried by the EGR cooler is also greatly reduced, the heat dissipation requirement of a finished automobile is greatly reduced, and the further increase of the water temperature of the engine is effectively delayed or prevented.
And the engine does not stop running when entering the high-temperature running mode, so that the driving comfort of the vehicle is improved.
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, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for thermal protection of an engine according to an embodiment of the present invention;
FIG. 2 is another schematic flow chart diagram of a method for thermal protection of an engine according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for thermal protection of an engine according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an engine thermal protection device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another configuration of an engine thermal protection apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an engine thermal protection device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for thermal protection of an engine according to an embodiment of the present invention, the method including:
s10: acquiring the actual water temperature of an engine;
in this step, since the water temperature of the engine is a direct factor affecting the operating state of the engine, and the continuous rise of the water temperature can directly damage the engine and even affect other parts of the whole vehicle, the actual water temperature of the engine is taken as a reference condition in the embodiment of the present application.
S11: judging whether the actual water temperature is greater than a first preset protection temperature or not;
in this step, the selection criterion of the first preset protection temperature is that the engine can continuously run at the first preset protection temperature without damaging the engine. The first preset protection temperature is different in value based on different engine types, and is not limited in the embodiment of the present invention.
S12: if so, enabling the engine to enter a high-temperature operation mode, wherein the high-temperature operation mode is a mode in which the EGR rate of the engine is smaller than a preset value.
If not, the process returns to step S10 to continuously acquire the actual water temperature of the engine.
In this step, the EGR (Exhaust Gas Recirculation) rate is the ratio of the amount of Exhaust Gas recirculated by the engine to the total amount of intake air taken into the cylinder, and when the engine EGR is lowered and is less than a preset value, the EGR cooler heat carrying amount is also greatly reduced.
In the embodiment, the engine thermal protection method compares the actual water temperature of the engine with a first preset protection temperature, when the actual water temperature is higher than the first preset protection temperature, the engine enters a high-temperature operation mode, the high-temperature operation mode is a mode in which the engine EGR rate is lower than a preset value, and when the engine EGR is reduced and is lower than the preset value, the heat carried away by the EGR cooler is also greatly reduced, so that the heat dissipation requirement of the whole vehicle is greatly reduced, and the further increase of the water temperature of the engine is effectively delayed or prevented.
And the engine does not stop running when entering the high-temperature running mode, so that the driving comfort of the vehicle is improved.
Further, based on the above embodiment of the present invention, in another embodiment of the present invention, with reference to fig. 2, fig. 2 is another schematic flow chart of a method for thermal protection of an engine according to an embodiment of the present invention, where the method further includes:
s13: acquiring the high-temperature operation water temperature in the high-temperature operation mode;
in the step, the high-temperature running water temperature of the engine in the high-temperature running mode is obtained in real time, and because the high-temperature running mode only slows down the rise of the water temperature, when the water temperature is still in a continuous rising state, the engine is damaged subsequently, and therefore the high-temperature running water temperature is also obtained in real time.
S14: judging whether the high-temperature operation water temperature is greater than a second preset protection temperature or not;
in this step, the second preset protection temperature is greater than the first preset protection temperature, and when the water temperature of the engine reaches the second preset protection temperature, the service life of the engine will be affected, and the second preset protection temperature may be selected according to different types of engines, which is not limited in the embodiment of the present invention.
S15: if yes, alarming.
If not, returning to the step S13, and continuously acquiring the high-temperature operation water temperature in the high-temperature operation mode.
In this step, the alarm mode is a sound and light alarm mode, for example, the whole vehicle sends out an alarm prompt tone and/or a corresponding icon of a dashboard of the whole vehicle lights up.
In the embodiment, the engine is further thermally protected, so that damage to the engine is greatly reduced, and the service life of the engine is prolonged.
Further, based on the above embodiment of the present invention, in another embodiment of the present invention, with reference to fig. 3, fig. 3 is a schematic flow chart of a method for thermal protection of an engine according to an embodiment of the present invention, where the method further includes: the method further comprises the following steps:
s16: judging whether the high-temperature operation water temperature is greater than a third preset protection temperature or not;
in this step, the third preset protection temperature is greater than the second preset protection temperature, and when the water temperature of the engine reaches the third preset protection temperature, the engine is damaged, that is, the engine runs to a critical point, and the second preset protection temperature is selected according to different types of engines, which is not limited in the embodiment of the present invention.
S17: and if so, controlling the running state of the engine so as to enable the torque of the engine to be smaller than a preset value.
If not, returning to the step S13, and continuously acquiring the high-temperature operation water temperature in the high-temperature operation mode.
In this step, if the engine is continuously in the current operating state, the engine is inevitably damaged, and even other components of the whole vehicle are damaged, so when the water temperature of the engine reaches a third preset protection temperature, the operating state of the engine is forcibly controlled so that the torque of the engine is smaller than the preset value.
In the embodiment, the engine is further thermally protected, so that damage to the engine is greatly reduced, and the service life of the engine is prolonged.
Based on all the above embodiments of the present invention, in another embodiment of the present invention, there is further provided an engine thermal protection device, and referring to fig. 4, fig. 4 is a schematic structural diagram of the engine thermal protection device provided in the embodiment of the present invention, where the engine thermal protection device includes:
a first obtaining module 41, configured to obtain an actual water temperature of the engine;
a first judging module 42, configured to judge whether the actual water temperature is greater than a first preset protection temperature; if yes, the first execution module 43 is triggered; if not, triggering the first obtaining module 41;
the first execution module 43 is configured to enable the engine to enter a high-temperature operation mode, wherein the high-temperature operation mode is a mode in which an engine EGR rate is smaller than a preset value.
Further, referring to fig. 5, fig. 5 is another schematic structural diagram of an engine thermal protection device according to an embodiment of the present invention, where the device further includes:
a second obtaining module 51, configured to obtain a high-temperature operating water temperature in the high-temperature operating mode;
the second judging module 52 is configured to judge whether the high-temperature operating water temperature is greater than a second preset protection temperature; if yes, the second execution module 53 is triggered; if not, the second obtaining module 51 is triggered
The second execution module 53 is configured to perform an alarm;
wherein the second preset protection temperature is greater than the first preset protection temperature.
Further, referring to fig. 6, fig. 6 is a schematic structural diagram of a thermal protection device for an engine according to an embodiment of the present invention, where the device further includes:
the third judging module 61 is used for judging whether the high-temperature operation water temperature is greater than a third preset protection temperature; if yes, triggering the third execution module 62;
the third execution module 62 is configured to control an operation state of the engine so that a torque of the engine is smaller than a preset value;
wherein the third preset protection temperature is greater than the second preset protection temperature.
It should be noted that the principle of the engine thermal protection device is the same as that of the engine thermal protection method, and the details are not repeated herein.
The engine thermal protection method and the engine thermal protection device provided by the invention are described in detail, specific examples are applied in the description to explain the principle and the implementation mode of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A method of engine thermal protection, the method comprising:
acquiring the actual water temperature of an engine;
judging whether the actual water temperature is greater than a first preset protection temperature, wherein the first preset protection temperature indicates that the engine can continuously and safely operate at the first preset protection temperature;
if so, enabling the engine to enter a high-temperature operation mode, wherein the high-temperature operation mode is a mode in which the EGR rate of the engine is smaller than a preset value;
acquiring the high-temperature operation water temperature in the high-temperature operation mode;
judging whether the high-temperature operation water temperature is greater than a second preset protection temperature, wherein the second preset protection temperature is greater than the first preset protection temperature;
if yes, alarming;
judging whether the high-temperature operation water temperature is greater than a third preset protection temperature or not;
if so, controlling the running state of the engine so as to enable the torque of the engine to be smaller than a preset value;
wherein the third preset protection temperature is greater than the second preset protection temperature.
2. An engine thermal protection device, comprising:
the first acquisition module is used for acquiring the actual water temperature of the engine;
the first judgment module is used for judging whether the actual water temperature is greater than a first preset protection temperature or not, wherein the first preset protection temperature indicates that the engine can continuously and safely operate at the first preset protection temperature; if yes, triggering a first execution module;
the first execution module is used for enabling the engine to enter a high-temperature operation mode, wherein the high-temperature operation mode is a mode that an engine EGR rate is smaller than a preset value;
the second acquisition module is used for acquiring the high-temperature operation water temperature in the high-temperature operation mode;
the second judgment module is used for judging whether the high-temperature operation water temperature is greater than a second preset protection temperature or not; if so, triggering a second execution module, wherein the second preset protection temperature is greater than the first preset protection temperature;
the second execution module is used for alarming;
the third judgment module is used for judging whether the high-temperature operation water temperature is greater than a third preset protection temperature or not; if yes, triggering a third execution module;
the third execution module is used for controlling the running state of the engine so as to enable the torque of the engine to be smaller than a preset value;
wherein the third preset protection temperature is greater than the second preset protection temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811275481.1A CN109372644B (en) | 2018-10-30 | 2018-10-30 | Engine thermal protection method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811275481.1A CN109372644B (en) | 2018-10-30 | 2018-10-30 | Engine thermal protection method and device |
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| CN109372644A CN109372644A (en) | 2019-02-22 |
| CN109372644B true CN109372644B (en) | 2021-12-21 |
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| CN112523875B (en) * | 2020-12-01 | 2022-08-12 | 广西玉柴机器股份有限公司 | Control method for override function of marine engine |
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