CN115217655A - Protection method for sealing performance of engine cylinder head gasket and engine - Google Patents

Protection method for sealing performance of engine cylinder head gasket and engine Download PDF

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Publication number
CN115217655A
CN115217655A CN202210403152.0A CN202210403152A CN115217655A CN 115217655 A CN115217655 A CN 115217655A CN 202210403152 A CN202210403152 A CN 202210403152A CN 115217655 A CN115217655 A CN 115217655A
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China
Prior art keywords
engine
torque
working
head gasket
output torque
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CN202210403152.0A
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CN115217655B (en
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王家武
陈良
何龙龙
吴广权
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • 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
    • F02D41/0002—Controlling intake air
    • 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
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0414—Air temperature
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/26—Control of the engine output torque by applying a torque limit

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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 application belongs to the field of engines, and particularly relates to a method for protecting the sealing performance of an engine cylinder head gasket and an engine, wherein the method for protecting the sealing performance of the engine cylinder head gasket comprises the following steps: the method comprises the steps of obtaining working parameters of an engine, determining the working condition of the engine according to the working parameters of the engine, and reducing the maximum value of the output torque of the engine when the working condition of the engine is a cold start working condition. In this application, work as when the operating mode of engine is when cold start operating mode, reduce the output torque maximum value of engine reduces the air input of engine, reduces the engine air input and can reduce the cylinder implosion pressure, avoids the too big sealing pressure who leads to the gasket of cylinder implosion pressure to reduce, can make both cylinder body, cylinder cap and the position deformation of gasket contact tend to unanimously simultaneously, avoids near the deformation of cylinder hole to lead to the decline of gasket outlying sealing pressure greatly, causes sealing pressure not enough, produces the leakage even.

Description

Protection method for sealing performance of engine cylinder head gasket and engine
Technical Field
The application belongs to the field of engines, and particularly relates to a protection method for sealing performance of an engine cylinder head gasket and an engine.
Background
With the increasing power density of engines, the sealing capability of the cylinder head gasket needs to be increased continuously to meet the sealing requirement of the combustion chamber.
The cylinder cover gasket is sealed by the cylinder body and the cylinder cover through the axial force action of the bolts, and sealing pressure is formed between the bottom surface of the cylinder cover and the top surface of the cylinder body. During the working process of the engine, particularly during low-temperature cold start, the engine is in a low-temperature state at the initial start because the external temperature is too low, when the engine is ignited, the temperature in a cylinder is rapidly increased in a short time, and the peripheral temperature of the engine is still in the low-temperature state because the temperature transmission needs a certain time. The high temperature of the cylinder wall and the low temperature of the periphery form a certain temperature difference, which causes the deformation inconsistency of the contact positions of the cylinder body and the cylinder cover and the gasket, the high temperature near the cylinder hole, the large deformation bulge, the reduction of the sealing pressure of the periphery, and the easy cause of insufficient sealing pressure and even leakage.
Meanwhile, in a low-temperature area, the air density is high, and when the engine works, the air inflow sucked into the cylinder is increased, so that the detonation pressure in the cylinder exceeds the maximum detonation pressure in a normal-temperature state, and the risk of gasket peripheral leakage is aggravated. In order to prevent the cylinder head gasket from sealing failure, the number of layers of the cylinder head gasket is continuously increased, the process is more complicated, and the cost is continuously increased.
Disclosure of Invention
The application aims to provide a protection method for the sealing performance of a cylinder head gasket of an engine and the engine, so that the risk of sealing failure of the cylinder head gasket is reduced.
In order to achieve the above object, the present application provides a method for protecting the sealing performance of an engine head gasket, comprising:
acquiring working parameters of an engine;
determining the working condition of the engine according to the working parameters of the engine;
and when the working condition of the engine is a cold starting working condition, reducing the maximum output torque of the engine.
Optionally, when the operating condition of the engine is a cold start operating condition, the method for reducing the maximum output torque of the engine comprises the following steps:
confirming that the working condition of the engine is a cold start working condition;
determining the working strength of the engine according to the working parameters of the engine;
and when the working intensity of the engine is confirmed to exceed a preset intensity threshold value, reducing the maximum output torque value of the engine.
Optionally, the method for determining the working strength of the engine according to the working parameters of the engine comprises:
acquiring the rotating speed of the engine;
and when the rotating speed of the engine is confirmed to be greater than or equal to the threshold rotating speed, determining that the working intensity of the engine exceeds a preset intensity threshold value.
Optionally, the method for determining the working strength of the engine according to the working parameters of the engine comprises:
acquiring the load of the engine;
when it is confirmed that the load of the engine is greater than or equal to the threshold load, it is determined that the operating intensity of the engine exceeds a preset intensity threshold.
Optionally, the method for reducing the maximum output torque of the engine when the working intensity of the engine is confirmed to exceed the preset intensity threshold value comprises the following steps:
determining a first torque limiting coefficient corresponding to the rotating speed of the engine and the load of the engine based on the corresponding relation of preset rotating speed, load and torque limiting coefficient;
calculating an output torque coefficient according to the first torque limit coefficient, and taking the product of the output torque coefficient and the current torque as a first target torque;
and controlling the output torque maximum value of the engine to be reduced to the first target torque.
Optionally, the method for confirming that the operating condition of the engine is the cold start operating condition includes:
acquiring the outlet water temperature of the cooling water of the engine and the inlet air temperature of the engine;
and when the outlet water temperature is less than or equal to the critical water temperature and the inlet air temperature is less than or equal to the critical air temperature, determining the working condition of the engine as a cold start working condition.
Optionally, the method for reducing the maximum output torque of the engine when the working intensity of the engine is confirmed to exceed the preset intensity threshold value comprises the following steps:
determining a second torque limiting coefficient corresponding to the outlet water temperature and the inlet air temperature based on the corresponding relation of preset water temperature, air temperature and torque limiting coefficient;
calculating an output torque coefficient according to the second torque limiting coefficient, and taking the product of the output torque coefficient and a reference torque as a second target torque, wherein the reference torque is the maximum value of the output torque when the engine is in a hot start state;
and controlling the output torque maximum value of the engine to be reduced to the second target torque.
Optionally, the method for protecting the sealing performance of the engine cylinder head gasket further comprises the following steps:
when the outlet water temperature is confirmed to be less than or equal to the critical water temperature and the inlet air temperature is confirmed to be less than or equal to the critical air temperature, controlling a cooling water path of the engine to open a first cycle, wherein the first cycle is that the cooling water path circulates in the engine;
and when the outlet water temperature is confirmed to be higher than the critical water temperature, controlling a cooling water path of the engine to open a second cycle, wherein the second cycle is that the cooling water path of the engine circulates between the engine and a radiator.
Optionally, before the step of obtaining the operating parameters of the engine, the method for protecting the sealing performance of the engine head gasket further comprises:
carrying out the operation on a water temperature sensor and an air temperature sensor;
and when the water temperature sensor and the air temperature sensor are confirmed to be in working states, the water outlet temperature of the engine is obtained through the water temperature sensor, and the air inlet temperature of the engine is obtained through the air temperature sensor.
Optionally, after the step of reducing the maximum output torque of the engine, the method for protecting the sealing performance of the engine head gasket further comprises:
acquiring the water outlet temperature of the engine;
and when the outlet water temperature is confirmed to be larger than the critical water temperature, releasing the torque limit of the engine.
The present application further provides an engine comprising:
a memory for storing configuration information of the engine;
and the controller is used for reading the configuration information of the engine and executing a protection method of the sealing performance of the engine cylinder head gasket.
The protection method for the sealing performance of the engine cylinder head gasket and the engine have the following beneficial effects:
in the application, when the operating mode of engine is cold start operating mode, reduce the output torque maximum value of engine, the method of reducing the output torque maximum value of engine is including reducing the air input of engine, it can reduce the cylinder implosion pressure to reduce the engine air input, avoid the cylinder implosion to press the great sealing pressure that leads to the gasket and reduce, can make cylinder body, cylinder cap both and gasket contact's position deformation tend to unanimity simultaneously, it leads to the gasket outlying sealing pressure to descend to avoid near the jar hole deformation greatly, cause sealing pressure not enough, produce the leakage even.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flow chart of a method for protecting the sealing performance of an engine head gasket according to an embodiment of the present application.
Fig. 2 is a flowchart of a step S400 of a method for protecting the sealing performance of the engine head gasket according to the embodiment of the present application.
Fig. 3 is a map showing the correspondence relationship between the water temperature, the air temperature, and the torque limit coefficient in the embodiment of the present application.
Fig. 4 is a corresponding relationship diagram of the rotation speed, the load and the torque limiting coefficient in the embodiment of the present application.
FIG. 5 is a block flow diagram of a method for protecting engine head gasket seal performance in accordance with an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The present application is further described in detail below with reference to the following figures and specific examples. It should be noted that the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
Fig. 1 is a flowchart of a method for protecting the sealing performance of an engine head gasket according to an embodiment of the present application, and referring to fig. 1, the method for protecting the sealing performance of an engine head gasket includes:
s200: acquiring working parameters of an engine;
s300: determining the working condition of the engine according to the working parameters of the engine;
s400: and when the working condition of the engine is a cold starting working condition, reducing the maximum output torque of the engine.
The operating parameters of the engine are used to reflect the operating state of the engine, and may include, but are not limited to, the outlet water temperature of engine cooling water, the inlet air temperature of the engine, the engine speed, and the engine load, and the specific operating parameters may be determined as appropriate.
The engine includes: the cylinder cover, the cylinder body and the gasket clamped between the cylinder body and the cylinder cover have the function of sealing the cylinder body and the cylinder cover. The cooling water of the engine can flow into the engine from the cylinder body and flow out of the engine through the cylinder cover, a water temperature sensor for detecting the outlet water temperature of the cylinder cover can be arranged at the outlet position of the cooling water of the cylinder cover of the engine, and an air temperature sensor for detecting the inlet air temperature of the engine can be arranged in the inlet channel of the engine, but the specific positions of the water temperature sensor and the air temperature sensor can be determined according to the situation.
When the engine is cold started at low temperature, the initial engine is in a low-temperature state when the external temperature is too low, the temperature in the cylinder is rapidly increased in a short time when the engine is ignited, and the peripheral temperature of the engine is still in a low-temperature state because the temperature transmission needs a certain time. The high temperature of the cylinder wall and the low temperature of the periphery form a certain temperature difference, which causes the deformation inconsistency of the contact positions of the cylinder body and the cylinder cover and the gasket, the high temperature and the large deformation near the cylinder hole, the reduction of the sealing pressure of the periphery, and the insufficient sealing pressure and even the leakage are easy to cause.
In the application, when the operating mode of engine is cold start operating mode, reduce the output torque maximum value of engine, the method of reducing the output torque maximum value of engine includes the air input that reduces the engine, reduce the engine air input and can reduce the cylinder implosion pressure, avoid the too big sealing pressure that leads to the gasket of cylinder implosion pressure to reduce, can make cylinder body, cylinder cap both and gasket contact's position deformation tend to unanimity simultaneously, avoid near the cylinder hole to warp greatly to lead to the fact the peripheral sealing pressure of gasket to descend, cause sealing pressure not enough, produce the leakage even.
Fig. 2 is a flowchart of step S400 of the method for protecting the sealing performance of the engine head gasket according to the embodiment of the present application, and referring to fig. 2, step S400 includes:
s410: confirming that the working condition of the engine is a cold start working condition;
s420: determining the working strength of the engine according to the working parameters of the engine;
s430: and when the working intensity of the engine is confirmed to exceed a preset intensity threshold value, reducing the maximum output torque value of the engine.
The working strength of the engine exceeds a preset strength threshold value, which shows that the cylinder internal explosion pressure of the engine is increased under the working condition of violent driving.
When the working condition of the engine is a cold start working condition and the engine is in a working condition of violent driving, the maximum output torque of the engine is reduced, namely, the air input of the engine is further reduced, so that the cylinder implosion pressure can be reduced, and the phenomenon that the sealing pressure of the gasket is reduced due to the fact that the cylinder implosion pressure is too large, the sealing pressure is insufficient, and even leakage is generated is avoided.
Referring to fig. 2, the method for confirming that the operating condition of the engine is the cold start operating condition in step S410 includes:
and acquiring the outlet water temperature of the cooling water of the engine, and determining the working condition of the engine as a cold start working condition when the outlet water temperature is less than or equal to the critical water temperature. The critical water temperature is 5 to 10 ℃, and for example, the critical water temperature may be 5 ℃, 8 ℃ or 10 ℃.
It should be noted that when the outlet water temperature is less than or equal to the critical water temperature, it is determined that the working condition of the engine is the cold start working condition, that is, whether the working condition of the engine is the cold start working condition can be determined by the outlet water temperature of the cooling water of the engine, but not limited thereto, whether the working condition of the engine is the cold start working condition can also be determined by the temperatures of the cylinder body, the cylinder cover, and other parts of the engine, which may be determined according to the situation.
The cooling water of the engine flows in from the cylinder body and flows out of the engine through the cylinder cover, whether the engine is in a cold start working condition or not is judged according to the water outlet temperature of the engine, the working condition judgment of the engine can be more accurate, meanwhile, a water temperature sensor is usually arranged at a cooling water outlet of the cylinder cover of the engine, whether the engine is in the cold start working condition or not is judged according to the water outlet temperature of the engine, the water temperature sensor is not additionally arranged, and the production cost of the engine can be reduced.
Referring to fig. 2, the method for confirming that the operating condition of the engine is the cold start operating condition in step S410 further includes:
and acquiring the air inlet temperature of cooling water of the engine, and determining the working condition of the engine as a cold start working condition when the air inlet temperature is less than or equal to the critical air temperature. The critical temperature is 30 to 40 ℃, and for example, the critical temperature may be 30 ℃, 35 ℃ or 40 ℃.
It should be noted that, when the intake air temperature is less than or equal to the critical air temperature, it is determined that the operating condition of the engine is the cold start operating condition, that is, whether the operating condition of the engine is the cold start operating condition can be determined by the intake air temperature of the engine, but the present invention is not limited thereto, and whether the operating condition of the engine is the cold start operating condition can also be determined by the temperatures of the cylinder block, the cylinder head, and other parts of the engine, which may be determined as the case may be.
In a low-temperature environment, the air inlet temperature is low, the air density is high, when an engine works, the air inlet amount sucked into a cylinder is increased, the detonation pressure in the engine cylinder is easily caused to exceed the maximum detonation pressure in a normal temperature state, and the risk of gasket peripheral leakage is aggravated.
Whether the engine is the cold start operating mode is judged through the inlet air temperature, and when the operating mode of engine was the cold start operating mode, the output torque maximum value that reduces the engine, also reduced the engine air input promptly, can reduce the cylinder implosion pressure like this, avoided the cylinder implosion pressure too big sealing pressure that leads to the gasket to reduce, caused sealing pressure not enough, produced the leakage even.
Referring to fig. 2, the method for confirming that the operating condition of the engine is the cold start operating condition in step S410 further includes:
acquiring the outlet water temperature of cooling water of an engine and the inlet air temperature of the engine;
and when the outlet water temperature is less than or equal to the critical water temperature and the inlet air temperature is less than or equal to the critical air temperature, determining the working condition of the engine as a cold start working condition.
When the engine is cold-started in a low-temperature environment, the water outlet temperature and the air inlet temperature of the engine are close to each other, and meanwhile, the working condition of the engine is judged whether to be a cold-start working condition or not by adopting two parameters of the water outlet temperature and the air inlet temperature, so that the judgment result can be more accurate.
In addition, when the engine is cold started in a low-temperature environment, in order to quickly obtain a warm air conditioner so as to meet the heating requirement of passengers on the vehicle, the accelerator pedal can be deeply stepped on, and the process of gasket sealing failure is accelerated. The air inlet temperature is introduced to judge whether the working condition of the engine is a cold start working condition, when the engine is cold started in a low-temperature environment, the torque of the engine is limited, the cylinder implosion pressure can be reduced, and the phenomenon that the sealing pressure of the gasket is reduced due to the fact that the cylinder implosion pressure is too large, so that the sealing pressure is insufficient and even leakage is generated is avoided.
Referring to fig. 2, the method of determining the operation intensity of the engine in step S420 includes:
acquiring the rotating speed of an engine;
when the rotation speed of the engine is confirmed to be greater than or equal to the threshold rotation speed, the working intensity of the engine is determined to exceed a preset intensity threshold value.
The critical rotation speed is 2500 to 3500 rotations, and for example, 2500 rotations, 3000 rotations, 3500 rotations, or the like can be set as the critical rotation speed.
It should be noted that, when the rotation speed of the engine is greater than or equal to the threshold rotation speed, it is determined that the working strength of the engine exceeds the preset strength threshold, that is, the working strength of the engine can be determined by the rotation speed of the engine, but the present invention is not limited thereto, and the working strength of the engine can also be determined by parameters such as the cylinder detonation pressure of the engine, the fuel injection amount of the engine, and the like, as the case may be. The working intensity of the engine exceeds a preset intensity threshold value, which indicates that the engine is in a working condition of violent driving.
The working strength of the engine is judged through the rotating speed of the engine, the judgment result can be more accurate, and meanwhile, the rotating speed of the engine is obtained without additionally arranging a sensor, so that the production cost of the engine can be reduced.
Referring to fig. 2, the method for determining the operation intensity of the engine in step S420 further includes:
acquiring the load of an engine;
when it is confirmed that the load of the engine is greater than or equal to the threshold load, it is determined that the operating intensity of the engine exceeds a preset intensity threshold.
The critical load is 60% to 70% of the maximum load of the generator, and for example, the critical load may be 60%, 65%, or 70% of the maximum load of the generator.
It should be noted that, when the load of the engine is greater than or equal to the critical load, it is determined that the working strength of the engine exceeds the preset strength threshold, that is, the working strength of the engine can be judged according to the engine load, but the present invention is not limited thereto, and the working strength of the engine can also be judged according to parameters such as the cylinder detonation pressure of the engine, the fuel injection amount of the engine, and the like, as the case may be.
The working strength of the engine is judged through the load of the engine, the judgment result can be more accurate, and meanwhile, the load of the engine is obtained without additionally arranging a sensor, so that the production cost of the engine can be reduced.
Referring to fig. 2, the method for determining the operation intensity of the engine in step S420 further includes:
acquiring the rotating speed and the load of an engine;
when the rotation speed of the engine is confirmed to be greater than or equal to the threshold rotation speed and the load of the engine is confirmed to be greater than or equal to the threshold load, the working intensity of the engine is determined to exceed a preset intensity threshold value.
The working strength of the engine is judged through two sets of parameters of the rotating speed and the load of the engine, so that the judgment result is more accurate.
Fig. 3 is a corresponding relationship diagram of water temperature, air temperature and torque limit coefficients in the embodiment of the present application, fig. 4 is a corresponding relationship diagram of rotation speed, load and torque limit coefficients in the embodiment of the present application, and referring to fig. 2 to 4, the method for confirming that the operating condition of the engine is the cold start operating condition in step S430 includes:
s431: determining a second torque limiting coefficient corresponding to the water outlet temperature and the air inlet temperature based on the corresponding relation of the preset water temperature, air temperature and torque limiting coefficient;
s432: calculating an output torque coefficient according to the second torque limiting coefficient, and taking the product of the output torque coefficient and a reference torque as a second target torque, wherein the reference torque is the maximum value of the output torque when the engine is in a hot start state;
s433: controlling the maximum output torque of the engine to be reduced to a second target torque;
s434: determining a first torque limiting coefficient corresponding to the rotating speed of the engine and the load of the engine based on the corresponding relation of the preset rotating speed, the preset load and the torque limiting coefficient;
s435: calculating an output torque coefficient according to the first torque limit coefficient, taking the product of the output torque coefficient and the current torque as a first target torque, wherein the current torque is a second target torque;
s436: the maximum output torque of the engine is controlled to be reduced to the first target torque.
It should be noted that, if the working intensity of the engine does not have a preset intensity threshold, that is, the engine is not in a condition of violent driving, only the maximum output torque of the engine is controlled to be reduced to the second target torque; if the working intensity of the engine exceeds the preset intensity threshold, that is, the engine is under a condition of violent driving, the maximum output torque of the engine can be controlled to be reduced to the second target torque first, and then the maximum output torque of the engine can be controlled to be reduced to the first target torque.
Illustrative ofWhen the outlet water temperature of the engine is T w0 Intake air temperature of engine is T c0 From the correspondence relationship between the water temperature, the air temperature, and the torque limit coefficient shown in fig. 3, the second torque limit coefficient is D 4 Coefficient of output torque of 1-D 4 The second target torque is M 2 ：
M 2 ＝M 0 ×(1-D 4 )；
Wherein M is 0 The maximum value of the output torque when the engine is started in a hot state.
When the engine speed is R 8 Load of engine is L 8 According to the corresponding relationship among the rotation speed, the load and the torque limiting coefficient shown in fig. 4, the first torque limiting coefficient is a 3 Coefficient of output torque of 1-a 3 The first target torque is M 1 ：
M 1 ＝M 0 ×(1-D 4 )×(1-a 3 )。
The maximum value of the output torque of the engine is adjusted in a differentiation mode according to the outlet water temperature, the inlet air temperature, the rotating speed and the load of the engine, the lower the inlet air temperature and the outlet water temperature of the engine are, the greater the limit torque degree is, the higher the engine revolution number and the load are, the greater the torque limit is, the smaller the detonation pressure in the engine cylinder is, and the sealing failure caused by insufficient sealing pressure can be avoided.
In some embodiments, the method of protecting engine head gasket sealing performance further comprises:
when the outlet water temperature is less than or equal to the critical water temperature and the inlet air temperature is less than or equal to the critical air temperature, controlling a cooling water path of the engine to open a first circulation, wherein the first circulation is that the cooling water path circulates in the engine;
and when the outlet water temperature is confirmed to be higher than the critical water temperature, controlling a cooling water path of the engine to open a second cycle, wherein the second cycle is that the cooling water path of the engine circulates between the engine and the radiator.
It should be noted that the cooling water path of the engine is controlled to open the first cycle, where the first cycle is a cycle in which the cooling water path circulates inside the engine, and heat dissipation is not performed through a radiator, but the first cycle is not limited to this, and the cooling water of the engine may be rapidly heated by an external heat source, as the case may be. The cooling water path of the engine is controlled to open a second cycle, in which the cooling water path of the engine circulates between the engine and the radiator, but the temperature of the engine cooling water may be reduced in other ways, as the case may be.
The cooling water route of control engine opens first circulation, and first circulation is the internal cycle of cooling water route at the engine, does not pass through the radiator heat dissipation, and the cooling water of engine can heat up rapidly, and the cooling water heats up can improve the temperature of engine outer wall, reduces the deformation that arouses by the difference in temperature, and the sealing pressure that makes the gasket bear is more even to avoid sealing pressure inhomogeneous to lead to sealed the inefficacy.
Fig. 5 is a block flow diagram of a method for protecting the sealing performance of the cylinder head gasket of the engine according to the embodiment of the present application, and referring to fig. 1 and 5, the method for protecting the sealing performance of the cylinder head gasket of the engine includes:
s100: detecting a water temperature sensor and an air temperature sensor;
s200: when the water temperature sensor and the air temperature sensor are confirmed to be in working states, the water outlet temperature of the engine is obtained through the water temperature sensor, and the air inlet temperature of the engine is obtained through the air temperature sensor;
s300: determining the working condition of the engine according to the working parameters of the engine;
s400: and when the working condition of the engine is a cold starting working condition, reducing the maximum output torque of the engine.
After the whole vehicle is electrified, the water temperature sensor and the air temperature sensor are detected, if the water temperature sensor and the air temperature sensor work normally, the water outlet temperature and the air inlet temperature of the engine can be obtained through the water temperature sensor and the air temperature sensor, if the water temperature sensor and the air temperature sensor work abnormally, a fault code is prompted, and therefore the situation that the obtained water outlet temperature and the obtained air inlet temperature are inaccurate and the normal operation of the engine is influenced can be avoided.
Referring to fig. 1 and 5, the method for protecting the sealing performance of the engine head gasket includes:
s100: detecting a water temperature sensor and an air temperature sensor;
s200: when the water temperature sensor and the air temperature sensor are confirmed to be in working states, the water outlet temperature of the engine is obtained through the water temperature sensor, and the air inlet temperature of the engine is obtained through the air temperature sensor;
s300: determining the working condition of the engine according to the working parameters of the engine;
s400: and when the working condition of the engine is a cold starting working condition, reducing the maximum output torque of the engine.
S500: acquiring the water outlet temperature of an engine;
s600: and when the water outlet temperature is confirmed to be larger than the critical water temperature, releasing the torque limit of the engine.
It should be noted that the torque limitation of the engine may be released when the leaving water temperature is higher than the critical water temperature, but the present invention is not limited thereto, and the torque limitation of the engine may be released when the starting time of the engine or the temperature of the cylinder block, the cylinder head, and the like of the engine reaches a preset value, as the case may be.
When the water outlet temperature of the engine is higher than the critical water temperature, the internal temperature and the external temperature of the engine tend to be consistent, the gasket is clamped between the cylinder cover and the cylinder body, the sealing pressure borne by the gasket is uniform, the torque limitation of the engine is relieved, the sealing failure caused by the nonuniform sealing pressure can be avoided, and meanwhile, the power of the engine can be stronger.
The application also provides a protection system for the sealing performance of the engine cylinder head gasket, which comprises a self-checking unit, a detection unit, a judgment unit and an execution unit; the self-checking unit is used for detecting the water temperature sensor and the air temperature sensor; when the detection unit confirms that the water temperature sensor and the air temperature sensor are in working states, the water temperature sensor is used for acquiring the water outlet temperature of the engine, and the air temperature sensor is used for acquiring the air inlet temperature of the engine; the judging unit determines the working condition of the engine according to the working parameters of the engine; when the working condition of the engine is a cold starting working condition, the execution unit reduces the maximum output torque of the engine, and when the water outlet temperature is confirmed to be larger than the critical water temperature, the torque limit of the engine is released.
The present application further provides an engine, comprising: the device comprises a memory and a controller, wherein the memory is used for storing configuration information of the engine, and the configuration information comprises the corresponding relation of the critical water temperature, the critical air temperature, the critical load, the critical rotating speed, the water temperature, the air temperature and the torque limiting coefficient of the engine, the corresponding relation of the rotating speed, the load and the torque limiting coefficient and the like. The controller is used for reading configuration information of the engine and executing a protection method of the sealing performance of the engine cylinder head gasket.
The terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description herein, references to the description of the terms "some embodiments," "exemplary," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or exemplary is included in at least one embodiment or exemplary of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described, it is understood that the above embodiments are illustrative and should not be construed as limiting the present application and that various changes, modifications, substitutions and alterations can be made therein by those skilled in the art within the scope of the present application, and therefore all changes and modifications that come within the meaning of the claims and the description of the invention are to be embraced therein.

Claims (11)

1. A method of protecting the sealing performance of an engine head gasket, comprising:
acquiring working parameters of an engine;
determining the working condition of the engine according to the working parameters of the engine;
and when the working condition of the engine is a cold starting working condition, reducing the maximum output torque of the engine.
2. The method of protecting cylinder head gasket sealing performance of an engine according to claim 1, wherein said method of reducing the maximum value of the output torque of the engine when the operating condition of the engine is a cold start operating condition comprises:
confirming that the working condition of the engine is a cold start working condition;
determining the working strength of the engine according to the working parameters of the engine;
and when the working intensity of the engine is confirmed to exceed a preset intensity threshold value, reducing the maximum output torque value of the engine.
3. The method of protecting engine head gasket seal performance of claim 2 wherein said method of determining an operating strength of an engine based on said engine operating parameters comprises:
acquiring the rotating speed of the engine;
and when the rotating speed of the engine is confirmed to be greater than or equal to the threshold rotating speed, determining that the working intensity of the engine exceeds a preset intensity threshold value.
4. The method of protecting engine head gasket seal performance of claim 2 wherein said method of determining an operating strength of an engine based on said engine operating parameters comprises:
acquiring the load of the engine;
when the load of the engine is confirmed to be larger than or equal to the critical load, the working intensity of the engine is determined to exceed a preset intensity threshold value.
5. The method for protecting the sealing performance of the engine cylinder head gasket according to claim 2, wherein the method for confirming that the working strength of the engine exceeds a preset strength threshold value and reducing the maximum output torque of the engine comprises the following steps:
determining a first torque limiting coefficient corresponding to the rotating speed of the engine and the load of the engine based on the corresponding relation of preset rotating speed, load and torque limiting coefficient;
calculating an output torque coefficient according to the first torque limiting coefficient, and taking the product of the output torque coefficient and the current torque as a first target torque;
and controlling the output torque maximum value of the engine to be reduced to the first target torque.
6. The method of protecting cylinder head gasket sealing performance of an engine according to claim 2, wherein said method of confirming that said engine operating condition is a cold start operating condition comprises:
acquiring the outlet water temperature of the cooling water of the engine and the inlet air temperature of the engine;
and when the outlet water temperature is less than or equal to the critical water temperature and the inlet air temperature is less than or equal to the critical air temperature, determining the working condition of the engine as a cold start working condition.
7. The method for protecting the sealing performance of the engine cylinder head gasket according to claim 6, wherein the method for confirming that the working intensity of the engine exceeds a preset intensity threshold value, and reducing the maximum value of the output torque of the engine comprises:
determining a second torque limiting coefficient corresponding to the outlet water temperature and the inlet air temperature based on the corresponding relation of preset water temperature, air temperature and torque limiting coefficient;
calculating an output torque coefficient according to the second torque limiting coefficient, and taking the product of the output torque coefficient and a reference torque as a second target torque, wherein the reference torque is the maximum value of the output torque when the engine is in a hot start state;
and controlling the output torque maximum value of the engine to be reduced to the second target torque.
8. The method of protecting engine head gasket sealing performance according to claim 6, further comprising:
when the outlet water temperature is confirmed to be less than or equal to the critical water temperature and the inlet air temperature is confirmed to be less than or equal to the critical air temperature, controlling a cooling water path of the engine to open a first cycle, wherein the first cycle is that the cooling water path circulates in the engine;
and when the outlet water temperature is confirmed to be higher than the critical water temperature, controlling a cooling water path of the engine to open a second cycle, wherein the second cycle is that the cooling water path of the engine circulates between the engine and a radiator.
9. The engine head gasket seal performance protecting method according to claim 1, wherein said engine head gasket seal performance protecting method further comprises, before said step of obtaining operating parameters of the engine:
carrying out the operation on a water temperature sensor and an air temperature sensor;
and when the water temperature sensor and the air temperature sensor are confirmed to be in working states, the water outlet temperature of the engine is obtained through the water temperature sensor, and the air inlet temperature of the engine is obtained through the air temperature sensor.
10. The engine head gasket sealing performance protecting method according to claim 1, wherein after said step of reducing the maximum value of the output torque of said engine, said engine head gasket sealing performance protecting method further comprises:
acquiring the water outlet temperature of the engine;
and when the outlet water temperature is confirmed to be larger than the critical water temperature, releasing the torque limit of the engine.
11. An engine, comprising:
a memory for storing configuration information of the engine;
a controller for reading configuration information of the engine and executing the method of protecting engine head gasket sealing performance according to any one of claims 1 to 10.
CN202210403152.0A 2022-04-18 2022-04-18 Protection method for sealing performance of engine cylinder cover gasket and engine Active CN115217655B (en)

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