CN115217655B - Protection method for sealing performance of engine cylinder cover gasket and engine - Google Patents

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

Methods to protect the sealing performance of engine cylinder head gasket and engine

Technical field

This application belongs to the field of engines, and specifically relates to a method for protecting the sealing performance of an engine cylinder head gasket and an engine.

Background technique

As the power density of engines continues to increase, in order to meet the sealing requirements of the combustion chamber, the sealing capacity of the cylinder head gasket needs to be continuously improved.

The sealing of the cylinder head gasket is the axial force between the cylinder block and the cylinder head through the bolts, which forms a sealing pressure between the bottom surface of the cylinder head and the top surface of the cylinder block. During engine operation, especially during low-temperature cold starts, due to the low external temperature, the engine is in a low-temperature state at the beginning of startup. When the engine ignites, the temperature in the cylinder rises sharply in a short period of time. Due to the temperature transmission, a certain amount of time is required. time, the engine peripheral temperature is still at a low temperature. The high temperature of the cylinder wall and the low temperature of the periphery form a certain temperature difference, resulting in inconsistent deformation of the cylinder block and cylinder head at the contact positions with the gasket. The high temperature near the cylinder hole causes large deformation and bulges, and the peripheral sealing pressure decreases, easily causing insufficient sealing pressure. , or even leakage.

At the same time, in the low-temperature area, the air density is relatively high. When the engine is working, the amount of intake air sucked into the cylinder becomes larger, causing the explosion pressure in the cylinder to exceed the maximum explosion pressure at normal temperature, exacerbating the risk of peripheral leakage of the gasket. In order to prevent the cylinder head gasket from sealing failure, the number of layers of the cylinder head gasket continues to increase, the process becomes more complex, and the cost continues to increase.

Contents of the invention

The purpose of this application is to provide a method and engine for protecting the sealing performance of an engine cylinder head gasket, so as to reduce the risk of cylinder head gasket sealing failure.

In order to achieve the above purpose, this application provides a method for protecting the sealing performance of the engine cylinder head gasket, including:

Obtain the operating parameters of the engine;

Determine the operating conditions of the engine according to the operating parameters of the engine;

When the operating condition of the engine is a cold start operating condition, the maximum output torque of the engine is reduced.

Optionally, the method of reducing the maximum output torque of the engine when the engine is in a cold start condition includes:

Confirm that the operating condition of the engine is a cold start condition;

Determine the working intensity of the engine according to the working parameters of the engine;

When it is confirmed that the working intensity of the engine exceeds the preset intensity threshold, the maximum output torque of the engine is reduced.

Optionally, the method of determining the working intensity of the engine based on the working parameters of the engine includes:

Obtain the rotation speed of the engine;

When it is confirmed that the rotation speed of the engine is greater than or equal to the critical rotation speed, it is determined that the working intensity of the engine exceeds the preset intensity threshold.

Optionally, the method of determining the working intensity of the engine based on the working parameters of the engine includes:

Obtain the load of said engine;

When it is confirmed that the load of the engine is greater than or equal to the critical load, it is determined that the working intensity of the engine exceeds the preset intensity threshold.

Optionally, when it is confirmed that the working intensity of the engine exceeds a preset intensity threshold, the method of reducing the maximum output torque of the engine includes:

Based on the preset corresponding relationship between rotation speed, load and torque limitation coefficient, determine a first torque limitation coefficient corresponding to the rotation speed of the engine and the load of the engine;

Calculate an output torque coefficient according to the first torque limit coefficient, and use the product of the output torque coefficient and the current torque as the first target torque;

The maximum output torque of the engine is controlled to be reduced to the first target torque.

Optionally, the method for confirming that the engine's operating condition is a cold start operating condition includes:

Obtain the outlet temperature of the cooling water of the engine and the intake air temperature of the engine;

When the outlet water temperature is less than or equal to the critical water temperature and the intake air temperature is less than or equal to the critical air temperature, the operating condition of the engine is determined to be a cold start operating condition.

Optionally, when it is confirmed that the working intensity of the engine exceeds a preset intensity threshold, the method of reducing the maximum output torque of the engine includes:

Based on the preset corresponding relationship between water temperature, air temperature and torque limitation coefficient, determine a second torque limitation coefficient corresponding to the outlet water temperature and the intake air temperature;

Calculate the output torque coefficient according to the second torque limit coefficient, and use the product of the output torque coefficient and the reference torque as the second target torque, where the reference torque is the maximum output torque of the engine during hot start;

The maximum output torque of the engine is controlled to be reduced to the second target torque.

Optionally, the method for protecting the sealing performance of the engine cylinder head gasket also includes:

When it is confirmed that the outlet water temperature is less than or equal to the critical water temperature and the intake air temperature is less than or equal to the critical air temperature, the cooling water circuit of the engine is controlled to open a first cycle, wherein the first cycle is the cooling water circuit circulating within said engine;

When it is confirmed that the outlet water temperature is greater than the critical water temperature, the cooling water path of the engine is controlled to start a second cycle, wherein the second cycle is for the cooling water path of the engine to circulate between the engine and the radiator.

Optionally, before the step of obtaining the operating parameters of the engine, the method for protecting the sealing performance of the engine cylinder head gasket also includes:

Carry out on water temperature sensor and air temperature sensor;

When it is confirmed that the water temperature sensor and the air temperature sensor are in working condition, the outlet water temperature of the engine is obtained through the water temperature sensor, and the intake air 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 cylinder head gasket further includes:

Obtain the outlet water temperature of the engine;

When it is confirmed that the outlet water temperature is greater than the critical water temperature, the torque limit of the engine is released.

This application also provides an engine, including:

A memory used to store configuration information of the engine;

A controller is configured to read the configuration information of the engine and execute a method for protecting the sealing performance of the engine cylinder head gasket.

The method for protecting the sealing performance of the engine cylinder head gasket and the engine disclosed in this application have the following beneficial effects:

In this application, when the working condition of the engine is a cold start condition, the maximum output torque of the engine is reduced. The method of reducing the maximum output torque of the engine includes reducing the air intake of the engine, reducing the engine intake The air volume can reduce the explosion pressure in the cylinder and prevent the gasket sealing pressure from being reduced due to excessive explosion pressure in the cylinder. At the same time, it can make the deformation of the cylinder block and cylinder head in contact with the gasket tend to be consistent, preventing the cylinder bore from being deformed. Large deformation nearby causes the sealing pressure around the gasket to drop, resulting in insufficient sealing pressure and even leakage.

Additional features and advantages of the invention will be apparent from the detailed description which follows, or, in part, may be learned by practice of the invention.

It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and do not limit the present disclosure.

Description of the 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. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a flow chart of a method for protecting the sealing performance of an engine cylinder head gasket in an embodiment of the present application.

Figure 2 is a flow chart of step S400 of the method for protecting the sealing performance of the engine cylinder head gasket in the embodiment of the present application.

Figure 3 is a corresponding relationship diagram between water temperature, air temperature and torque limit coefficient in the embodiment of the present application.

Figure 4 is a corresponding relationship diagram between rotation speed, load and torque limit coefficient in the embodiment of the present application.

Figure 5 is a flow chart of a method for protecting the sealing performance of the engine cylinder head gasket in the embodiment of the present application.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in various 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 concepts 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 provide a thorough understanding of embodiments of the present application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known methods, apparatus, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the present application.

The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted here that the technical features involved in the various embodiments of the present application described below can 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 are intended to explain the present application, but should not be construed as limiting the present application.

Figure 1 is a flow chart of a method for protecting the sealing performance of an engine cylinder head gasket in an embodiment of the present application. As shown in Figure 1, the method for protecting the sealing performance of an engine cylinder head gasket includes:

S200: Obtain the operating parameters of the engine;

S300: Determine the engine's operating conditions based on the engine's operating parameters;

S400: When the engine operating condition is cold start, reduce the maximum output torque of the engine.

The working parameters of the engine are used to reflect the working status of the engine. The working parameters may include the outlet temperature of the engine cooling water, the engine intake air temperature, the engine speed, the engine load, etc., but are not limited to this. The specific working parameters may depend on the situation. Depends.

The engine includes: cylinder head, cylinder block and gasket sandwiched between the cylinder block and cylinder head. The gasket has the function of sealing the cylinder block and cylinder head. The cooling water of the engine can flow in from the cylinder block and flow out of the engine through the cylinder head. The water temperature sensor for detecting the outlet water temperature of the cylinder head can be set at the outlet position of the cooling water of the engine cylinder head. The air temperature sensor for detecting the engine intake air temperature can be set at In the engine air intake, but not limited to this, the specific locations of the water temperature sensor and air temperature sensor may depend on the situation.

When the engine is started at low temperature, due to the low external temperature, the engine is in a low temperature state initially. When the engine is ignited, the temperature in the cylinder rises sharply in a short period of time. Since the temperature transmission takes a certain amount of time, the engine peripheral temperature still remains. in a low temperature state. The high temperature of the cylinder wall and the low temperature of the periphery form a certain temperature difference, resulting in inconsistent deformation of the cylinder block and cylinder head at the contact positions with the gasket. The high temperature and large deformation near the cylinder hole will reduce the sealing pressure of the periphery, which may easily lead to insufficient sealing pressure, or even Leakage occurs.

In this application, when the engine's working condition is a cold start condition, the maximum output torque of the engine is reduced. The method for reducing the maximum output torque of the engine includes reducing the air intake volume of the engine. Reducing the air intake volume of the engine can reduce the engine's maximum output torque. The explosion pressure in the small cylinder prevents the sealing pressure of the gasket from being reduced due to excessive explosion pressure in the cylinder. At the same time, the deformation of the contact positions of the cylinder block and the cylinder head with the gasket becomes consistent to avoid large deformation near the cylinder hole. The sealing pressure around the gasket drops, causing insufficient sealing pressure and even leakage.

Figure 2 is a flow chart of step S400 of the method for protecting the sealing performance of the engine cylinder head gasket in the embodiment of the present application. As shown in Figure 2, step S400 includes:

S410: Confirm that the engine operating condition is cold start condition;

S420: Determine the engine's working intensity based on the engine's working parameters;

S430: When it is confirmed that the engine's working intensity exceeds the preset intensity threshold, reduce the maximum output torque of the engine.

The working intensity of the engine exceeds the preset intensity threshold, indicating that the engine is under intense driving conditions, and the engine's in-cylinder explosion pressure increases under intense driving conditions.

When the engine is in a cold start condition and the engine is under intense driving conditions, the maximum output torque of the engine is reduced, that is, the engine air intake is further reduced. This can reduce the explosion pressure in the cylinder and avoid Excessive explosion pressure in the cylinder causes the sealing pressure of the gasket to decrease, resulting in insufficient sealing pressure and even leakage.

Referring to Figure 2, the method for confirming that the engine operating condition is a cold start operating condition in step S410 includes:

Obtain the outlet temperature of the engine's cooling water. When the outlet water temperature is less than or equal to the critical water temperature, the engine's operating condition is determined to be a cold start condition. The critical water temperature is 5°C to 10°C. For example, the critical water temperature can be set to 5°C, 8°C, or 10°C.

It should be noted that when the outlet water temperature is less than or equal to the critical water temperature, the engine's operating condition is determined to be a cold start condition. That is to say, whether the engine's operating condition is a cold start condition can be determined by the outlet temperature of the engine's cooling water. , but is not limited to this. Whether the engine's working condition is a cold start condition can also be judged by the temperature of the engine's cylinder block, cylinder head and other parts, depending on the situation.

The cooling water of the engine flows in from the cylinder block and flows out of the engine through the cylinder head. Judging whether the engine is in cold start condition through the engine water temperature can make the judgment of the engine working condition more accurate. At the same time, the cooling water outlet of the engine cylinder head is usually set There is a water temperature sensor, which can determine whether the engine is in cold start condition through the engine water temperature. There is no need to set up an additional water temperature sensor, which can reduce the production cost of the engine.

As shown in Figure 2, the method of confirming that the engine operating condition is a cold start operating condition in step S410 also includes:

Obtain the intake air temperature of the engine's cooling water. When the intake air temperature is less than or equal to the critical air temperature, the engine operating condition is determined to be a cold start condition. The critical temperature is 30℃~40℃. For example, the critical temperature can be set to 30℃, 35℃ or 40℃.

It should be noted that when the intake air temperature is less than or equal to the critical air temperature, the engine's operating condition is determined to be a cold start condition. That is to say, whether the engine's operating condition is a cold start condition can be determined by the engine's intake air temperature. But it is not limited to this. Whether the engine's working condition is a cold start condition can also be judged by the temperature of the engine's cylinder block, cylinder head and other parts, depending on the situation.

In a low-temperature environment, the intake air temperature is low and the air density is high. When the engine is working, the amount of intake air sucked into the cylinder becomes larger, which can easily cause the explosion pressure in the engine cylinder to exceed the maximum explosion pressure at normal temperature, which will aggravate the gasket. Risk of peripheral leakage.

Use the intake air temperature to determine whether the engine is in a cold start condition. When the engine is in a cold start condition, reduce the maximum output torque of the engine, that is, reduce the engine air intake volume, which can reduce the explosion pressure in the cylinder. , to avoid excessive explosion pressure in the cylinder, which will reduce the sealing pressure of the gasket, resulting in insufficient sealing pressure and even leakage.

As shown in Figure 2, the method of confirming that the engine operating condition is a cold start operating condition in step S410 also includes:

Obtain the outlet temperature of the engine's cooling water and the engine's intake air temperature;

When the outlet water temperature is less than or equal to the critical water temperature and the intake air temperature is less than or equal to the critical air temperature, the engine operating condition is determined to be a cold start condition.

When the engine is cold-started in a low-temperature environment, the engine's outlet water temperature and intake air temperature are close to each other. Using the outlet water temperature and intake air temperature to determine whether the engine's working condition is a cold start condition can make the judgment result more accurate.

In addition, when the engine is cold-started in a low-temperature environment, in order to obtain warm air and air conditioning faster to meet the heating needs of the passengers in the car, the accelerator pedal will be deeply depressed, which accelerates the process of gasket seal failure. The intake air temperature is introduced to determine whether the engine's working condition is a cold start condition. When the engine is cold started in a low-temperature environment, limiting the engine torque can reduce the explosion pressure in the cylinder and avoid gasket failure caused by excessive explosion pressure in the cylinder. The sealing pressure decreases, resulting in insufficient sealing pressure and even leakage.

As shown in Figure 2, the method for determining the working intensity of the engine in step S420 includes:

Get the engine speed;

When it is confirmed that the engine speed is greater than or equal to the critical speed, it is determined that the engine's working intensity exceeds the preset intensity threshold.

The critical speed is 2500 rpm ~ 3500 rpm. For example, the critical speed can be set to 2500 rpm, 3000 rpm or 3500 rpm.

It should be noted that when the engine speed is greater than or equal to the critical speed, it is determined that the engine's working intensity exceeds the preset intensity threshold. That is to say, the engine's working intensity can be judged by the engine speed, but is not limited to this, and can also be judged by the engine speed. The in-cylinder explosion pressure, engine fuel injection volume and other parameters are used to judge the working intensity of the engine, which depends on the situation. The engine's working intensity exceeds the preset intensity threshold, indicating that the engine is under intense driving conditions.

Judging the working intensity of the engine through the engine speed can make the judgment result more accurate. At the same time, obtaining the engine speed does not require additional sensors, which can reduce the production cost of the engine.

As shown in Figure 2, the method for determining the working intensity of the engine in step S420 also includes:

Get the engine load;

When it is confirmed that the load of the engine is greater than or equal to the critical load, it is determined that the working intensity of the engine exceeds the preset intensity threshold.

The critical load is 60% to 70% of the maximum load of the generator. For example, the critical load can be set to 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 intensity of the engine exceeds the preset intensity threshold, that is to say, the working intensity of the engine can be judged by the engine load, but is not limited to this, and can also be judged by the engine load. The in-cylinder explosion pressure, engine fuel injection volume and other parameters are used to judge the working intensity of the engine, which depends on the situation.

Judging the working intensity of the engine through the engine load can make the judgment results more accurate. At the same time, obtaining the engine load does not require additional sensors, which can reduce the production cost of the engine.

As shown in Figure 2, the method for determining the working intensity of the engine in step S420 also includes:

Obtain engine speed and load;

When it is confirmed that the engine speed is greater than or equal to the critical speed and the engine load is greater than or equal to the critical load, it is determined that the engine's working intensity exceeds the preset intensity threshold.

Judging the working intensity of the engine through the two parameters of engine speed and load can make the judgment result more accurate.

Figure 3 is a corresponding relationship diagram of water temperature, air temperature and torque limit coefficient in the embodiment of the present application. Figure 4 is a corresponding relationship diagram of the rotation speed, load and torque limit coefficient in the embodiment of the present application. See Figures 2 to 4 for the steps. The methods for confirming that the engine's operating condition is a cold start condition in S430 include:

S431: Based on the preset corresponding relationship between water temperature, air temperature and torque limitation coefficient, determine the second torque limitation coefficient corresponding to the outlet water temperature and intake air temperature;

S432: Calculate the output torque coefficient according to the second torque limit coefficient, and use the product of the output torque coefficient and the base torque as the second target torque. The base torque is the maximum output torque when the engine is hot-started;

S433: Control the maximum output torque of the engine to reduce to the second target torque;

S434: Based on the preset corresponding relationship between speed, load and torque limit coefficient, determine the first torque limit coefficient corresponding to the engine speed and engine load;

S435: Calculate the output torque coefficient according to the first torque limit coefficient, use the product of the output torque coefficient and the current torque as the first target torque, and the current torque is the 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 engine's working intensity does not have a preset intensity threshold, that is, the engine is not under intense driving conditions, only the maximum output torque of the engine is controlled to be reduced to the second target torque; if the engine's working intensity The intensity exceeds the preset intensity threshold. That is to say, when the engine is under intense driving conditions, the maximum output torque of the engine can be controlled to first reduce to the second target torque, and then the maximum output torque of the engine can be controlled to reduce to the first target. torque, but is not limited to this, it can also directly control the maximum output torque of the engine to reduce it to the first target torque, depending on the situation.

For example, when the engine outlet water temperature is T _w0 and the engine inlet air temperature is T _c0 , according to the corresponding relationship between water temperature, air temperature and torque limit coefficient shown in Figure 3, it can be seen that the second torque limit coefficient is D ₄ and the output torque coefficient is 1-D ₄ , and the second target torque is M ₂ :

M ₂ =M ₀ ×(1-D ₄ );

Among them, M ₀ is the maximum output torque of the engine during hot start.

When the engine speed is R ₈ and the engine load is L ₈ , according to the corresponding relationship between the speed, load and torque limit coefficient shown in Figure 4, it can be seen that the first torque limit coefficient is a ₃ and the output torque coefficient is 1-a ₃ . The first target torque is M ₁ :

M ₁ =M ₀ ×(1-D ₄ )×(1-a ₃ ).

The maximum output torque of the engine is differentially adjusted according to the engine's outlet water temperature, intake air temperature, speed and load. The lower the engine's intake air temperature and outlet water temperature, the greater the torque limit. The higher the engine speed and load, the lower the torque. The greater the limit, the smaller the explosion pressure in the engine cylinder, which can avoid seal failure caused by insufficient sealing pressure.

In some embodiments, the method for protecting the sealing performance of the engine cylinder head gasket also includes:

When it is confirmed that the outlet water temperature is less than or equal to the critical water temperature and the intake air temperature is less than or equal to the critical air temperature, control the cooling water circuit of the engine to open the first cycle, where the first cycle is the internal circulation of the cooling water circuit in the engine;

When it is confirmed that the outlet water temperature is greater than the critical water temperature, the cooling water path of the engine is controlled to start a second cycle, where 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 start the first cycle. The first cycle is that the cooling water path circulates inside the engine without dissipating heat through the radiator. However, it is not limited to this. The cooling water of the engine can also be quickly heated through an external heat source. , it depends on the situation. Control the cooling water path of the engine to open the second cycle. The second cycle is for the cooling water path of the engine to circulate between the engine and the radiator. However, it is not limited to this. The temperature of the engine cooling water can also be reduced through other methods, depending on the situation. .

Control the cooling water path of the engine to start the first cycle. The first cycle is that the cooling water path circulates inside the engine without dissipating heat through the radiator. The cooling water of the engine can quickly heat up. The cooling water of the engine can heat up quickly. The heating of the cooling water can improve the performance of the engine. The temperature of the outer wall reduces the deformation caused by the temperature difference, allowing the gasket to bear more uniform sealing pressure, thus avoiding sealing failure caused by uneven sealing pressure.

Figure 5 is a flow chart of a method for protecting the sealing performance of the engine cylinder head gasket in the embodiment of the present application. Referring to Figures 1 and 5, the method for protecting the sealing performance of the engine cylinder head gasket includes:

S100: Detect the water temperature sensor and air temperature sensor;

S200: When it is confirmed that the water temperature sensor and the air temperature sensor are in working condition, the engine's outlet water temperature is obtained through the water temperature sensor, and the engine's intake air temperature is obtained through the air temperature sensor;

S300: Determine the engine's operating conditions based on the engine's operating parameters;

S400: When the engine operating condition is cold start, reduce the maximum output torque of the engine.

After the vehicle is powered on, the water temperature sensor and air temperature sensor are tested. If the water temperature sensor and air temperature sensor are working properly, the engine's outlet water temperature and intake air temperature can be obtained through the water temperature sensor and air temperature sensor. If the water temperature sensor and air temperature sensor are working, If it is abnormal, a fault code will be prompted, which can prevent the inaccurate obtained outlet water temperature and intake air temperature from affecting the normal operation of the engine.

Referring to Figures 1 and 5, methods to protect the sealing performance of the engine cylinder head gasket include:

S100: Detect the water temperature sensor and air temperature sensor;

S200: When it is confirmed that the water temperature sensor and the air temperature sensor are in working condition, the engine's outlet water temperature is obtained through the water temperature sensor, and the engine's intake air temperature is obtained through the air temperature sensor;

S300: Determine the engine's operating conditions based on the engine's operating parameters;

S400: When the engine operating condition is cold start, reduce the maximum output torque of the engine.

S500: Get the engine water temperature;

S600: When it is confirmed that the outlet water temperature is greater than the critical water temperature, the engine torque limit is released.

It should be noted that when the outlet water temperature is greater than the critical water temperature, the torque limit of the engine can be released, but it is not limited to this. It can also be performed when the engine starting time or the temperature of the engine cylinder block, cylinder head, etc. reaches a preset value. Release the engine's torque limit, depending on the situation.

When the outlet water temperature of the engine is greater than the critical water temperature, the internal and external temperatures of the engine tend to be consistent. The gasket is clamped between the cylinder head and the cylinder block. The sealing pressure endured by the gasket is relatively uniform. At this time, the torque limit of the engine is released and sealing can be avoided. Uneven pressure causes seal failure and can also make the engine more powerful.

This application also provides a protection system for the sealing performance of the engine cylinder head gasket, which includes a self-test unit, a detection unit, a judgment unit and an execution unit; the self-test unit is used to detect the water temperature sensor and air temperature sensor; the detection unit confirms When the water temperature sensor and the air temperature sensor are in working condition, the water temperature sensor is used to obtain the outlet water temperature of the engine, and the air temperature sensor is used to obtain the engine intake air temperature; the judgment unit determines the engine's operating conditions based on the engine's operating parameters; the execution unit determines the engine's operating conditions When it is a cold start condition, the maximum output torque of the engine is reduced, and when it is confirmed that the outlet water temperature is greater than the critical water temperature, the engine torque limit is lifted.

The application also provides an engine. The engine includes: a memory and a controller. The memory is used to store configuration information of the engine. The configuration information includes the critical water temperature, critical air temperature, critical load, critical speed, water temperature, air temperature and torque limit coefficient of the engine. The corresponding relationship, the corresponding relationship with the rotation speed, load and torque limit coefficient, etc. The controller is used to read the configuration information of the engine and execute a method for protecting the sealing performance of the engine cylinder head gasket.

The terms "first", "second", etc. are used for descriptive purposes only and shall not be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined by "first," "second," etc. may explicitly or implicitly include one or more of such features. In the description of this application, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

In this application, unless otherwise clearly stated and limited, the terms "assembly", "connection" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection. A connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the description of this specification, reference to the description of the terms "some embodiments," "exemplarily," etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present application or in the example. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and cannot be understood as limitations of the present application. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present application. The embodiments are subject to changes, modifications, substitutions and modifications, so any changes or modifications made in accordance with the claims and description of this application shall be within the scope of the patent of this application.

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.