CN115217655B - Protection method for sealing performance of engine cylinder cover gasket and engine - Google Patents
Protection method for sealing performance of engine cylinder cover gasket and engine Download PDFInfo
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- CN115217655B CN115217655B CN202210403152.0A CN202210403152A CN115217655B CN 115217655 B CN115217655 B CN 115217655B CN 202210403152 A CN202210403152 A CN 202210403152A CN 115217655 B CN115217655 B CN 115217655B
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- 238000007789 sealing Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 94
- 239000000498 cooling water Substances 0.000 claims description 35
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 238000004880 explosion Methods 0.000 description 18
- 230000001276 controlling effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- 230000017525 heat dissipation Effects 0.000 description 1
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Classifications
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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
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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
- F02D41/0002—Controlling intake air
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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
- 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
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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
- 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
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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
- 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
Abstract
The application belongs to the field of engines, and in particular relates to a protection method for sealing performance of an engine cylinder head gasket and an engine, wherein the protection method for the sealing performance of the engine cylinder head gasket comprises the following steps: and acquiring working parameters of an engine, determining working conditions 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 conditions of the engine are cold start working conditions. In this application, when the operating mode of engine is cold start operating mode, reduce the output torque maximum value of engine, reduce the air input of engine, reduce the engine air input and can reduce jar internal burst pressure, avoid jar internal burst pressure too big to lead to the sealing pressure of gasket to reduce, can make cylinder body, cylinder cap both to warp towards unanimity with the position that the gasket contacted simultaneously, avoid near the cylinder hole to warp big leading to the peripheral sealing pressure of gasket to descend, cause sealing pressure not enough, even produce the leakage.
Description
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
Along with the continuous improvement of the power density of the engine, in order to meet the sealing of the combustion chamber, the sealing capability of the cylinder head gasket is required to be continuously improved.
The sealing of the cylinder head gasket is that the cylinder body and the cylinder head form sealing pressure on the bottom surface of the cylinder head and the top surface of the cylinder body under the action of axial force of bolts. In the working process of the engine, particularly in the low-temperature cold start process, the engine is started in a low-temperature state initially due to the fact that the external temperature is too low, when the engine is ignited, the temperature in the cylinder rises sharply in a short time, and the peripheral temperature of the engine is still in the low-temperature state due to the fact that a certain time is required for temperature transmission. The high temperature of the cylinder wall and the low temperature of the periphery form a certain temperature difference, so that the deformation of the contact positions of the cylinder body and the cylinder cover with the gasket is inconsistent, the high temperature near the cylinder hole deforms greatly, the peripheral sealing pressure is reduced, the sealing pressure is easily insufficient, and even leakage is generated.
Meanwhile, in a low-temperature area, the air density is high, and when the engine works, the air intake amount sucked into the cylinder becomes large, so that the explosion pressure in the cylinder exceeds the maximum explosion pressure in a normal-temperature state, and the risk of peripheral leakage of the gasket is increased. In order to prevent the sealing failure of the cylinder head gasket, 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 sealing performance of an engine cylinder head gasket and an engine, so as to reduce the risk of sealing failure of the cylinder head gasket.
In order to achieve the above object, the present application provides a method for protecting sealing performance of an engine cylinder 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 start working condition, reducing the maximum value of the output torque of the engine.
Optionally, when the working condition of the engine is a cold start working condition, the method for reducing the maximum value of the output torque of the engine includes:
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 strength of the engine exceeds a preset strength threshold, reducing the maximum value of the output torque of the engine.
Optionally, the method for determining the working strength of the engine according to the working parameters of the engine comprises the following steps:
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 critical rotating speed, determining that the working strength of the engine exceeds a preset strength threshold value.
Optionally, the method for determining the working strength of the engine according to the working parameters of the engine comprises the following steps:
acquiring the load of the engine;
and when the load of the engine is confirmed to be greater than or equal to the critical load, determining that the working strength of the engine exceeds a preset strength threshold.
Optionally, the method for reducing the maximum value of the output torque of the engine when the working strength of the engine exceeds a preset strength 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 a corresponding relation among a 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;
the maximum value of the output torque of the engine is controlled to be reduced to the first target torque.
Optionally, the method for confirming that the working condition of the engine is a cold start working condition includes:
obtaining the outlet water temperature of 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 value of the output torque of the engine when the working strength of the engine exceeds a preset strength threshold value comprises the following steps:
determining a second torque limiting coefficient corresponding to the water outlet temperature and the air inlet temperature based on the corresponding relation among the 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 started at a hot state;
and controlling the maximum value of the output torque 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 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 start a first cycle, wherein the first cycle is the internal cycle of the cooling water path 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 start 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 working parameters of the engine, the protection method for the sealing performance of the engine cylinder head gasket further includes:
the water temperature sensor and the air temperature sensor are carried out;
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 value of the output torque of the engine, the protection method for the sealing performance of the engine cylinder head gasket further includes:
obtaining 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 also 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 for 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 working condition of the engine is a cold start working condition, the maximum value of the output torque of the engine is reduced, the method for reducing the maximum value of the output torque of the engine comprises the steps of reducing the air inflow of the engine, reducing the explosion pressure in a cylinder, avoiding the reduction of the sealing pressure of a gasket caused by overlarge explosion pressure in the cylinder, and simultaneously enabling the deformation of the positions of the cylinder body and the cylinder cover, which are in contact with the gasket, to be consistent, avoiding the reduction of the sealing pressure of the periphery of the gasket caused by the large deformation near a cylinder hole, and causing insufficient sealing pressure and even leakage.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned in part by the 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 application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a flowchart of a method of protecting engine head gasket sealing performance in an embodiment of the present application.
Fig. 2 is a flowchart of a method step S400 for protecting sealing performance of an engine head gasket in an embodiment of the present application.
Fig. 3 is a map of correspondence between water temperature, air temperature, and torque limiting coefficients in the embodiment of the present application.
Fig. 4 is a map of the correspondence of the rotational speed, load, and torque limiting coefficient in the embodiment of the present application.
Fig. 5 is a flow chart of a method of protecting engine head gasket sealing performance in an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many 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 the 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 present application. One skilled in the relevant art will recognize, however, that the aspects of the application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not 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 drawings and specific examples. It should be noted that the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
Fig. 1 is a flowchart of a method for protecting sealing performance of an engine cylinder head gasket according to an embodiment of the present application, and referring to fig. 1, the method for protecting sealing performance of an engine cylinder 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: when the working condition of the engine is a cold start working condition, the maximum value of the output torque of the engine is reduced.
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 the engine cooling water, the inlet air temperature of the engine, the rotation speed of the engine, the load of the engine, etc., 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, wherein the gasket has the function of sealing the cylinder body and the cylinder cover. Cooling water of the engine can flow in 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 air inlet channel of the engine, but the cooling water is not limited to the cooling water, and the specific positions of the water temperature sensor and the air temperature sensor can be determined according to conditions.
When the engine is started at low temperature and cold, the engine is started at low temperature initially due to the fact that the external temperature is too low, when the engine is ignited, the temperature in the cylinder rises sharply in a short time, and the peripheral temperature of the engine is still at low temperature due to the fact that a certain time is required for temperature transmission. The high temperature of the cylinder wall and the low temperature of the periphery form a certain temperature difference, so that the deformation of the contact positions of the cylinder body and the cylinder cover with the gasket is inconsistent, the high temperature near the cylinder hole is large in deformation, the sealing pressure of the periphery is reduced, and the sealing pressure is easy to be insufficient and even leakage is generated.
In the application, when the working condition of the engine is a cold start working condition, the maximum value of the output torque of the engine is reduced, the method for reducing the maximum value of the output torque of the engine comprises the steps of reducing the air inflow of the engine, reducing the explosion pressure in a cylinder, avoiding the reduction of the sealing pressure of a gasket caused by overlarge explosion pressure in the cylinder, simultaneously enabling the deformation of the positions of a cylinder body and a cylinder cover, which are contacted with the gasket, to be consistent, and avoiding the reduction of the sealing pressure of the periphery of the gasket caused by the large deformation near a cylinder hole, thereby causing the insufficient sealing pressure and even leakage.
Fig. 2 is a flowchart of a step S400 of a method for protecting sealing performance of an engine head gasket in an 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 strength of the engine exceeds a preset strength threshold, reducing the maximum value of the output torque of the engine.
The working strength of the engine exceeds a preset strength threshold value, which indicates that the cylinder explosion pressure of the engine is increased under the working condition of intense driving.
When the working condition of the engine is a cold start working condition and the engine is under a working condition of violent driving, the maximum value of the output torque of the engine is reduced, namely the air inflow of the engine is further reduced, so that the explosion pressure in the cylinder can be reduced, and the problem that the sealing pressure of a gasket is reduced due to the overlarge explosion pressure in the cylinder, so that the sealing pressure is insufficient and even leakage is generated is avoided.
Referring to fig. 2, the method for confirming that the engine operating condition is the cold start operating condition in step S410 includes:
and obtaining the outlet water temperature of 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 ℃, for example, the critical water temperature can be set to 5 ℃, 8 ℃ or 10 ℃.
It should be noted that when the outlet water temperature is less than or equal to the critical water temperature, the working condition of the engine is determined to be a cold start working condition, that is, whether the working condition of the engine is a cold start working condition can be determined by the outlet water temperature of the cooling water of the engine, but the method is not limited thereto, and whether the working condition of the engine is a cold start working condition can be determined by the temperatures of the cylinder body, the cylinder cover and other parts of the engine, and the method is specifically determined according to the situation.
The cooling water of engine flows in from the cylinder body, flows out of the engine through the cylinder cover, judges whether the engine is in a cold starting working condition through the water outlet temperature of the engine, can enable the working condition judgment of the engine to be more accurate, meanwhile, the cooling water outlet of the cylinder cover of the engine is usually provided with a water temperature sensor, judges whether the engine is in the cold starting working condition through the water outlet temperature of the engine, and can reduce the production cost of the engine without additionally arranging the water temperature sensor.
Referring to fig. 2, the method for confirming that the working condition of the engine is the cold start working 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 ℃, 40 ℃, or the like.
When the intake air temperature is less than or equal to the critical air temperature, the working condition of the engine is determined to be a cold start working condition, that is, whether the working condition of the engine is a cold start working condition can be determined by the intake air temperature of the engine, but the method is not limited to the cold start working condition, and whether the working condition of the engine is a cold start working condition can be determined by the temperatures of the cylinder body, the cylinder cover and other parts of the engine, and the specific situation can be determined according to the situation.
In a low-temperature environment, the air inlet temperature is low, the air density is high, the air inlet amount sucked into the cylinder becomes large when the engine works, the explosion pressure in the engine cylinder is easy to exceed the maximum explosion pressure in the normal temperature state, and the risk of leakage of the periphery of the gasket is increased.
Judging whether the engine is in a cold starting working condition through the air inlet temperature, when the working condition of the engine is in the cold starting working condition, reducing the maximum value of the output torque of the engine, namely reducing the air inflow of the engine, so that the explosion pressure in the cylinder can be reduced, and the problem that the sealing pressure of a gasket is reduced due to the overlarge explosion pressure in the cylinder, so that the sealing pressure is insufficient and even leakage is generated is avoided.
Referring to fig. 2, the method for confirming that the working condition of the engine is the cold start working condition in step S410 further includes:
obtaining 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, and meanwhile, the water outlet temperature and the air inlet temperature are adopted to judge whether the working condition of the engine is a cold-starting working condition or not, so that the judging result is more accurate.
In addition, when the engine is cold started in a low-temperature environment, in order to obtain warm air and air conditioner more quickly, the heating requirement of passengers on the vehicle is met, the accelerator pedal can be stepped on deeply, and the gasket sealing failure process 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 explosion pressure in the cylinder can be reduced, and the problem that the sealing pressure of a gasket is reduced due to overlarge explosion pressure in the cylinder, so that the sealing pressure is insufficient and even leakage is generated is avoided.
Referring to fig. 2, the method of determining the operation strength of the engine in step S420 includes:
acquiring the rotating speed of an engine;
and when the rotating speed of the engine is confirmed to be greater than or equal to the critical rotating speed, determining that the working strength of the engine exceeds a preset strength threshold value.
The critical rotation speed is 2500-3500, for example, 2500, 3000 or 3500.
When the rotation speed of the engine is greater than or equal to the critical 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 invention is not limited thereto, and the working strength of the engine can be determined by parameters such as the explosion pressure in the cylinder of the engine, the oil injection amount of the engine, and the like, and the working strength of the engine can be determined as appropriate. The working strength of the engine exceeds a preset strength threshold value, which indicates that the engine is under the working condition of intense driving.
The working strength of the engine is judged through the rotating speed of the engine, so that the judging result is more accurate, and meanwhile, a sensor is not required to be additionally arranged for acquiring the rotating speed of the engine, so that the production cost of the engine can be reduced.
Referring to fig. 2, the method for determining the operation strength of the engine in step S420 further includes:
acquiring the load of an engine;
when the load of the engine is confirmed to be greater than or equal to the critical load, the working strength of the engine is determined to exceed a preset strength threshold.
The critical load is 60% -70% of the maximum load of the generator, for example, the critical load can be set to be 60%, 65% or 70% of the maximum load of the generator.
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 determined by the engine load, but the method is not limited thereto, and the working strength of the engine can be determined by parameters such as the in-cylinder explosion pressure of the engine, the fuel injection amount of the engine, and the like, and the specific conditions can be determined as appropriate.
The working strength of the engine is judged through the load of the engine, so that the judging result is more accurate, and meanwhile, a sensor is not required to be additionally arranged for acquiring the load of the engine, so that the production cost of the engine can be reduced.
Referring to fig. 2, the method for determining the operation strength of the engine in step S420 further includes:
acquiring the rotating speed and load of an engine;
when the rotational speed of the engine is determined to be greater than or equal to the threshold rotational speed and the load of the engine is determined to be greater than or equal to the threshold load, the operating strength of the engine is determined to exceed a preset strength threshold.
The working strength of the engine is judged through two groups of parameters, namely the rotating speed and the load of the engine, so that the judging result is more accurate.
Fig. 3 is a corresponding relationship diagram of water temperature, air temperature and torque limiting coefficient in the embodiment of the present application, fig. 4 is a corresponding relationship diagram of rotation speed, load and torque limiting coefficient in the embodiment of the present application, referring to fig. 2 to 4, the method for confirming that the working condition of the engine is a cold start working 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 among the preset water temperature, air temperature and torque limiting coefficient;
s432: calculating an output torque coefficient according to the second torque limiting coefficient, 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 started up;
s433: controlling the maximum value of the 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, load and torque limiting coefficient;
s435: calculating an output torque coefficient according to the first torque limiting coefficient, taking the product of the output torque coefficient and the current torque as a first target torque, and taking the current torque as a second target torque;
s436: the maximum value of the output torque of the control engine is reduced to a first target torque.
If the working strength of the engine does not have the preset strength threshold, that is, the engine is not under the working condition of intense driving, only the maximum value of the output torque of the engine is controlled to be reduced to the second target torque; if the working strength of the engine exceeds a preset strength threshold, that is, the engine is under a working condition of intense driving, the maximum value of the output torque of the engine can be controlled to be reduced to the second target torque first, and then the maximum value of the output torque of the engine is controlled to be reduced to the first target torque.
For example, when the outlet water temperature of the engine is T w0 The intake air temperature of the engine is T c0 As can be seen from the correspondence relationship between the water temperature, the air temperature and the torque limiting coefficient shown in fig. 3, the second torque limiting coefficient is D 4 An output torque coefficient of 1-D 4 The second target torque is M 2 ：
M 2 ＝M 0 ×(1-D 4 )；
Wherein M is 0 Is the maximum value of the output torque at the time of engine warm start.
When the rotation speed of the engine is R 8 The load of the engine is L 8 As can be seen from the corresponding relationship between the rotation speed, the load and the torque limiting coefficient shown in fig. 4, the first torque limiting coefficient is a 3 An output torque coefficient 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 regulated in a differentiated mode according to the water outlet temperature, the air inlet temperature, the rotating speed and the load of the engine, the lower the air inlet temperature and the water outlet temperature of the engine are, the greater the limiting torque degree is, the higher the number of revolutions and the load of the engine are, the greater the torque limit is, the lower the explosion pressure in the cylinder of the engine is, and the sealing failure caused by insufficient sealing pressure can be avoided.
In some embodiments, the method for protecting the sealing performance of the engine cylinder head gasket 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 start a first cycle, wherein the first cycle is the internal cycle of the cooling water path 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 start a second cycle, wherein the second cycle is that the cooling water path of the engine circulates between the engine and the radiator.
The first cycle is controlled to start the cooling water path of the engine, and the first cycle is an internal cycle of the engine, and does not radiate heat through the radiator, but is not limited thereto, and the cooling water of the engine can be quickly heated by an external heat source, as the case may be. The cooling water path of the engine is controlled to start a second cycle, wherein the second cycle is that the cooling water path of the engine circulates between the engine and the radiator, but the cooling water path is not limited to the second cycle, and the temperature of cooling water of the engine can be reduced in other ways, and the specific situation can be determined according to the situation.
The cooling water path of the engine is controlled to start a first cycle, the first cycle is the internal cycle of the cooling water path in the engine, heat dissipation is not carried out through the radiator, cooling water of the engine can be rapidly heated, the temperature of the outer wall of the engine can be increased by heating the cooling water, deformation caused by temperature difference is reduced, sealing pressure born by the gasket is more uniform, and sealing failure caused by non-uniform sealing pressure is avoided.
Fig. 5 is a flow chart of a method for protecting sealing performance of an engine head gasket according to an embodiment of the present application, and referring to fig. 1 and 5, the method for protecting sealing performance of an 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 a working state, acquiring the water outlet temperature of the engine through the water temperature sensor, and acquiring the air inlet temperature of the engine through the air temperature sensor;
s300: determining the working condition of the engine according to the working parameters of the engine;
s400: when the working condition of the engine is a cold start working condition, the maximum value of the output torque of the engine is reduced.
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, and if the water temperature sensor and the air temperature sensor work abnormally, a fault code is prompted, so that the obtained water outlet temperature and air inlet temperature can be prevented from affecting the normal operation of the engine inaccurately.
Referring to fig. 1 and 5, the method for protecting the sealing performance of the engine cylinder head gasket comprises the following steps:
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 a working state, acquiring the water outlet temperature of the engine through the water temperature sensor, and acquiring the air inlet temperature of the engine through the air temperature sensor;
s300: determining the working condition of the engine according to the working parameters of the engine;
s400: when the working condition of the engine is a cold start working condition, the maximum value of the output torque of the engine is reduced.
S500: obtaining the outlet water temperature of an engine;
s600: when the outlet water temperature is confirmed to be greater than the critical water temperature, the torque restriction of the engine is released.
The torque limitation of the engine may be released when the outlet 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 engine start time, the temperature of the engine block, the cylinder head, or the like reaches a predetermined 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 born by the gasket is uniform, the torque limitation of the engine is relieved at the moment, the sealing failure caused by the non-uniform sealing pressure can be avoided, and meanwhile, the power of the engine is 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 judging unit and an executing 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 a working state, acquiring the water outlet temperature of the engine through the water temperature sensor and acquiring the air inlet temperature of the engine through the air temperature sensor; the judging unit determines the working condition of the engine according to the working parameters of the engine; and the execution unit reduces the maximum value of the output torque of the engine when the working condition of the engine is a cold start working condition, and releases the torque limit of the engine when the outlet water temperature is confirmed to be higher than the critical water temperature.
The present application also provides an engine, the engine comprising: the system comprises a memory and a controller, wherein the memory is used for storing configuration information of an engine, and the configuration information comprises critical water temperature, critical air temperature, critical load, critical rotation speed, water temperature, air temperature and torque limiting coefficient corresponding relation of the engine, rotation speed, load, torque limiting coefficient corresponding relation and the like. The controller is used for reading the configuration information of the engine and executing the 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 implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In the description of the present specification, reference to the terms "some embodiments," "exemplary," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the embodiments by one of ordinary skill in the art within the scope of the application, and therefore all changes and modifications that fall within the spirit and scope of the invention as defined by the claims and the specification of the application are intended to be covered thereby.
Claims (10)
1. The method for protecting the sealing performance of the engine cylinder cover gasket is characterized by comprising the following steps of:
acquiring working parameters of an engine;
determining the working condition of the engine according to the working parameters of the engine;
when the working condition of the engine is a cold start working condition, reducing the maximum value of the output torque of the engine to a second target torque M 2 ，M 2 ＝M 0 ×(1-D 4 ) Wherein M is 0 Maximum output torque at engine warm start, D 4 Is a second torque limiting coefficient;
when the working condition of the engine is a cold start working condition, the protection method for the sealing performance of the engine cylinder head gasket further comprises the following steps:
determining the working strength of the engine according to the working parameters of the engine;
when the working strength of the engine is confirmed to exceed a preset strength threshold value, reducing the maximum value of the output torque of the engine to a first target torque M on the basis of the second target torque 1 ，M 1 ＝M 0 ×(1-D 4 )×(1-a 3 ) Wherein a is 3 Is a first torque limiting coefficient.
2. The method for protecting sealing performance of engine head gasket according to claim 1, wherein 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 critical rotating speed, determining that the working strength of the engine exceeds a preset strength threshold value.
3. The method for protecting sealing performance of engine head gasket according to claim 1, wherein 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;
and when the load of the engine is confirmed to be greater than or equal to the critical load, determining that the working strength of the engine exceeds a preset strength threshold.
4. The method for protecting sealing performance of an engine head gasket according to claim 1, wherein the method for reducing the maximum value of the output torque of the engine when the operation strength of the engine is confirmed to exceed a preset strength threshold value comprises:
determining a first torque limiting coefficient corresponding to the rotating speed of the engine and the load of the engine based on a corresponding relation among a 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 the first target torque;
the maximum value of the output torque of the engine is controlled to be reduced to the first target torque.
5. The method for protecting sealing performance of an engine cylinder head gasket according to claim 1, wherein the method for confirming that the working condition of the engine is a cold start working condition comprises:
obtaining the outlet water temperature of 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.
6. The method for protecting sealing performance of an engine head gasket according to claim 5, wherein the method for reducing the maximum value of the output torque of the engine when the operation strength of the engine is confirmed to exceed a preset strength threshold value comprises:
determining a second torque limiting coefficient corresponding to the water outlet temperature and the air inlet temperature based on the corresponding relation among the 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 the second target torque, wherein the reference torque is the maximum value of the output torque when the engine is started at a hot state;
and controlling the maximum value of the output torque of the engine to be reduced to the second target torque.
7. The method for protecting the sealing performance of an engine cylinder head gasket according to claim 5, further comprising:
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 start a first cycle, wherein the first cycle is the internal cycle of the cooling water path 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 start a second cycle, wherein the second cycle is that the cooling water path of the engine circulates between the engine and a radiator.
8. The method for protecting the sealing performance of an engine head gasket according to claim 1, wherein before the step of acquiring the operating parameters of the engine, the method for protecting the sealing performance of an engine head gasket further comprises:
detecting a water temperature sensor and an air temperature sensor;
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.
9. The method of protecting engine head gasket sealing performance of claim 1, wherein after the step of reducing the maximum output torque of the engine, the method of protecting engine head gasket sealing performance further comprises:
obtaining 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.
10. An engine, comprising:
a memory for storing configuration information of the engine;
a controller for reading the configuration information of the engine and executing the protection method of the sealing performance of the engine head gasket according to any one of claims 1 to 9.
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| CN202210403152.0A CN115217655B (en) | 2022-04-18 | 2022-04-18 | Protection method for sealing performance of engine cylinder cover gasket and engine |
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