CN116181474A - Cylinder cover temperature control method and vehicle - Google Patents

Abstract

The invention belongs to the technical field of vehicles, and discloses a cylinder cover temperature control method and a vehicle, wherein the cylinder cover temperature control method obtains a cylinder cover cooling water outlet temperature limit and a temperature rise time limit according to an ambient temperature, an ambient pressure, an actual engine rotating speed, an actual engine torque, an actual engine air inlet temperature and a cylinder cover temperature resistant limit, and records engine oil temperature as an engine oil temperature record value when the cylinder cover cooling water outlet temperature is more than or equal to the cylinder cover cooling water outlet temperature limit and the duration of which the ambient temperature, the ambient pressure, the actual engine rotating speed, the actual engine torque and the actual engine air inlet temperature are all unchanged is more than or equal to the temperature rise time limit, and starts a fan of an electronic thermostat and a radiator; and when the actual cooling water outlet temperature of the cylinder cover is not smaller than the limit value of the cooling water outlet temperature of the cylinder cover and the actual engine oil temperature of the engine is not smaller than the engine oil temperature record value, executing a vehicle alarm protection strategy. The electronic thermostat can accurately judge the opening time.

Description

Cylinder cover temperature control method and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a cylinder cover temperature control method and a vehicle.

Background

The cylinder cover of the engine is an important part for ensuring the normal operation of the engine, under the plateau environment, the temperature of the cylinder cover is easily overhigh and even exceeds the temperature-resistant limit value of the cylinder cover due to the fact that the air is thin and the air inflow of the engine is reduced to cause the increase of the heat load in the cylinder, so that the cylinder cover has faults such as cracking and the like, and serious potential safety hazards exist. Moreover, in plain environments, if the intake air temperature of the engine is too high, the heat load in the cylinder may be too high, and the cylinder cover may be damaged. Therefore, the temperature of the cylinder cover needs to be controlled within a reasonable range so as to ensure that the engine has excellent performance and avoid potential safety hazards. In the prior art, the temperature of cooling water from a cylinder cover is reduced through the wax-type thermostat and the radiator, the static paraffin in the temperature sensing body of the wax-type thermostat is melted along with the temperature rise of the cooling water, and when the temperature of the cooling water reaches a set temperature, the wax-type thermostat is opened to guide the cooling water from the cylinder cover to the radiator for reducing the temperature. However, the opening condition of the wax-type thermostat is that when the temperature of cooling water reaches a certain fixed temperature, the time for opening the thermostat cannot be changed according to the environment where the vehicle is located and the actual running condition of the engine, and the thermostat may be opened too early or too late, the fuel consumption is too high due to the fact that the thermostat is opened too early, the cylinder cover is overheated and damaged due to the fact that the thermostat is opened too late, and potential safety hazards exist.

Disclosure of Invention

The invention aims to provide a cylinder cover temperature control method and a vehicle, which are used for solving the problems that in the prior art, a wax type thermostat is adopted, the opening condition of the wax type thermostat is that when the temperature of cooling water reaches a certain fixed temperature, the time for opening the thermostat cannot be changed according to the environment of the vehicle and the actual running condition of an engine, and the thermostat can be opened too early or too late.

To achieve the purpose, the invention adopts the following technical scheme:

the cylinder cover temperature control method comprises the following steps:

s1: detecting the environment temperature and the environment pressure of a vehicle in real time, and the actual rotation speed of an engine, the actual torque of the engine, the actual air inlet temperature of the engine and the actual water outlet temperature of cooling water of a cylinder cover;

s2: obtaining a cylinder cover cooling water outlet temperature limit and a temperature rise time limit according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine inlet temperature and a cylinder cover temperature resistance limit;

s3: judging whether the actual cooling water outlet temperature of the cylinder cover is greater than or equal to the limit value of the cooling water outlet temperature of the cylinder cover;

if yes, S4 is carried out;

if not, returning to the step S1;

s4: calculating a duration for which the ambient temperature, the ambient pressure, the engine actual rotational speed, the engine actual torque, and the engine actual intake air temperature are all kept stable;

s5: judging whether the duration time is more than or equal to the temperature rise time limit value;

if yes, recording the engine oil temperature at the moment as an oil temperature recording value, and performing S6;

if not, returning to the step S1;

s6: starting fans of the electronic thermostat and the radiator, and continuously working for a set time;

s7: judging whether the actual cooling water outlet temperature of the cylinder cover is smaller than the limit value of the cooling water outlet temperature of the cylinder cover;

if yes, closing the electronic thermostat and a fan of the radiator;

if not, S8 is carried out;

s8: judging whether the actual engine oil temperature of the engine is smaller than the engine oil temperature record value;

if not, executing the vehicle alarm protection strategy.

As a preferable scheme of the cylinder cover temperature control method, a cooling water temperature sensor is arranged at a water outlet of a cylinder cover cooling water channel, and the actual cooling water outlet temperature of the cylinder cover is detected by the cooling water temperature sensor;

and S8, if the actual engine oil temperature of the engine is smaller than the engine oil temperature recorded value, carrying out abnormal alarm on a cooling water temperature sensor.

As a preferred solution of the above cylinder head temperature control method, obtaining a cylinder head cooling water outlet temperature limit according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature, and a cylinder head temperature resistance limit includes:

and obtaining a cylinder cover cooling water outlet temperature limit value through a first MAP group according to the ambient temperature, the ambient pressure, the actual engine rotating speed, the actual engine torque, the actual engine inlet temperature and the cylinder cover temperature limit value.

As a preferable mode of the cylinder head temperature control method, the first MAP group includes a first plateau MAP and a first plain MAP;

judging whether the environment where the vehicle is located is a plateau or a plain according to the environmental pressure;

if the environment where the vehicle is located is a plateau, obtaining a cylinder cover cooling water outlet temperature limit value through the first plateau MAP according to the environment temperature, the environment pressure, the actual engine rotating speed, the actual engine torque, the actual engine inlet air temperature and a cylinder cover temperature resistance limit value;

and if the environment where the vehicle is located is plain, obtaining a cylinder cover cooling water outlet temperature limit value through the first plain MAP according to the environment temperature, the environment pressure, the actual engine rotating speed, the actual engine torque, the actual engine air inlet temperature and the cylinder cover temperature resistance limit value.

As a preferable mode of the cylinder head temperature control method, the obtaining the temperature rise time limit according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature and the cylinder head temperature resistance limit includes:

and obtaining a temperature rise time limit value through a second MAP group according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine air inlet temperature and the temperature resistance limit value of the cylinder cover.

As a preferable mode of the above cylinder head temperature control method, the second MAP group includes a second plateau MAP and a second plateau MAP;

according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature and the cylinder cover temperature resistance limit value, obtaining the temperature rise time limit value through a second MAP comprises:

judging whether the environment where the vehicle is located is a plateau or a plain according to the environmental pressure;

if the environment where the vehicle is located is a plateau, obtaining a temperature rise time limit value through a second plateau MAP according to the environment temperature, the environment pressure, the actual engine speed, the actual engine torque, the actual engine air inlet temperature and the cylinder cover temperature resistance limit value;

and if the environment where the vehicle is located is plain, obtaining a temperature rise time limit value through a second plain MAP according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine air inlet temperature and the cylinder cover temperature resistance limit value.

As a preferable mode of the cylinder head temperature control method, the vehicle alarm protection strategy includes:

alarming for abnormal temperature of the cylinder cover;

and controlling the actual rotating speed of the engine to be smaller than or equal to the set rotating speed, and controlling the actual torque of the engine to be smaller than or equal to the set torque.

As a preferable scheme of the cylinder cover temperature control method, the cylinder cover temperature resistance limit value is determined according to the material of the cylinder cover.

As a preferable mode of the cylinder head temperature control method, the engine is provided with an oil temperature sensor, and the actual oil temperature of the engine is detected by the oil temperature sensor.

The invention also provides a vehicle, which adopts the cylinder cover temperature control method, and comprises the following steps:

the engine is provided with a cylinder cover cooling water channel and a cylinder body cooling water channel, and a water outlet of the cylinder body cooling water channel is communicated with a water inlet of the cylinder cover cooling water channel;

the radiator comprises a radiating water tank and a fan, wherein the fan is used for cooling water in the radiating water tank;

the electronic thermostat is provided with a first port, a second port and a third port, the first port is communicated with a water outlet of the cylinder cover cooling water channel, the second port is communicated with an input end of the water pump, the third port is communicated with a water inlet of the radiating water tank, the first port can be communicated with the second port or the third port, a water outlet of the radiating water tank is communicated with an input end of the water pump, and an output end of the water pump is communicated with a water inlet of the cylinder body cooling water channel.

The invention has the beneficial effects that:

the invention provides a cylinder cover temperature control method and a vehicle. When the actual cooling water outlet temperature of the cylinder cover is larger than or equal to the limiting value of the cooling water outlet temperature of the cylinder cover, and the duration that the environmental temperature, the environmental pressure, the actual engine rotating speed, the actual engine torque and the actual engine inlet temperature are kept stable and unchanged at the moment is also larger than or equal to the limiting value of the heating time, the fans of the electronic thermostat and the radiator are started to cool the cooling water, and the engine oil temperature at the moment is recorded as an engine oil temperature recorded value. After the fan continuously works for a set time, judging whether the actual cooling water outlet temperature of the cylinder cover is smaller than the limit value of the cooling water outlet temperature of the cylinder cover; if yes, the fans of the electronic thermostat and the radiator are turned off, so that the purpose of cooling the cylinder cover is achieved; if not, judging whether the actual engine oil temperature of the engine is less than the engine oil temperature record value; and if the actual engine oil temperature of the engine is not less than the engine oil temperature recorded value, executing a vehicle alarm protection strategy. If the actual cooling water outlet temperature of the cylinder cover is not less than the limiting value of the cooling water outlet temperature of the cylinder cover and the actual engine oil temperature of the engine is not less than the recorded value of the engine oil temperature, the aim of cooling the cylinder cover is proved not to be achieved, the temperature of the cylinder cover can be continuously increased, a certain safety risk exists, and a vehicle alarm protection strategy needs to be executed.

According to the cylinder cover temperature control method, the opening and closing time of the electronic thermostat and the fan is judged according to the cylinder cover cooling water outlet temperature limit and the temperature rise time limit which are obtained according to the environment temperature, the environment pressure, the actual engine rotation speed, the actual engine torque, the actual engine inlet temperature and the cylinder cover temperature resistance limit, the actual environment and the actual engine running condition are comprehensively considered, the opening or closing time of the electronic thermostat and the fan can be accurately judged, the fuel consumption can be reduced, and the safety is improved. And after the electronic thermostat and the fan are started for a set time, if the actual cylinder cover cooling water outlet temperature is still not smaller than the cylinder cover cooling water outlet temperature limit value, judging whether the actual engine oil temperature of the engine is smaller than an engine oil temperature record value, and if the actual engine oil temperature of the engine is not smaller than the engine oil temperature record value, executing a vehicle alarm protection strategy. The comparison of the actual engine oil temperature and the engine oil temperature recorded value is increased, misjudgment caused by damage of a cooling water temperature sensor for detecting the temperature of cooling water can be prevented, and the accuracy of cylinder cover temperature control, the fuel economy of engine operation and the safety of vehicle running are improved.

Drawings

Fig. 1 is a flowchart of a cylinder head temperature control method according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, 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 above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The invention provides a cylinder cover temperature control method, as shown in fig. 1, which comprises the following steps:

s1: and detecting the environment temperature and the environment pressure of the vehicle in real time, and the actual rotation speed of the engine, the actual torque of the engine, the actual air inlet temperature of the engine and the actual water outlet temperature of the cylinder cover cooling water.

S2: and obtaining a water outlet temperature limit value and a temperature rise time limit value of the cooling water of the cylinder cover according to the ambient temperature, the ambient pressure, the actual rotating speed of the engine, the actual torque of the engine, the actual air inlet temperature of the engine and the temperature resistance limit value of the cylinder cover.

And determining the temperature resistance limit value of the cylinder cover according to the material of the cylinder cover.

Specifically, according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine air inlet temperature and the cylinder cover temperature resistance limit value, the cylinder cover cooling water outlet temperature limit value is obtained through the first MAP group. Wherein the first MAP group comprises a first plateau MAP and a first plain MAP; judging whether the environment of the vehicle is a plateau or a plain according to the environmental pressure; if the environment where the vehicle is located is a plateau, obtaining a water outlet temperature limit value of cooling water of the cylinder cover through a first plateau MAP; and if the environment where the vehicle is located is plain, obtaining the water outlet temperature limit value of the cooling water of the cylinder cover through the first plain MAP.

The first plateau MAP and the first plain MAP are obtained through a cylinder head temperature measurement test of a bench in the earlier stage. When the temperature measurement test of the cylinder cover is carried out, the engine works at different rotating speeds, different torques and different air inlet temperatures under different environment temperatures and different environment pressures, and the water outlet temperature and the cylinder cover temperature of the cylinder cover cooling water are recorded correspondingly. Based on the temperature measurement result, a relation diagram of the ambient temperature, the ambient pressure, the engine speed, the engine torque, the engine air inlet temperature, the cylinder cover temperature and the cylinder cover cooling water outlet temperature can be obtained, and the first MAP group is obtained. Performing a cylinder head temperature measurement test in an environment simulating a plateau to obtain a first plateau MAP; and performing a cylinder head temperature measurement test in an environment simulating the plain to obtain a first plain MAP.

When the temperature of the cylinder cover reaches the temperature-resistant limit value of the cylinder cover, the corresponding water outlet temperature of the cylinder cover cooling water is the water outlet temperature limit value of the cylinder cover cooling water. Through the first MAP group, the cylinder cover cooling water outlet temperature when the cylinder cover temperature reaches the cylinder cover temperature-resistant limit value can be obtained under the conditions of different environment temperatures, different environment pressures, different engine speeds, different engine torques and different engine inlet temperatures, and the cylinder cover cooling water outlet temperature limit value is obtained.

Specifically, the temperature rise time limit is obtained through the second MAP group according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature, and the cylinder head temperature resistance limit. Wherein the second MAP group comprises a second plateau MAP and a second plateau MAP; judging whether the environment where the vehicle is located is a plateau or a plain according to the environmental pressure; if the environment where the vehicle is located is a plateau, obtaining a temperature rise time limit value through a second plateau MAP; if the environment of the vehicle is plain, the temperature rise time limit value is obtained through the second plain MAP.

The second plateau MAP and the second plain MAP are obtained through a cylinder head temperature measurement test of the bench in the earlier stage. When the temperature measurement test of the cylinder cover is carried out, the engine works at different rotating speeds, different torques and different air inlet temperatures under different environment temperatures and different environment pressures, and the temperature of the cylinder cover corresponding to the increase of the working time of the engine is recorded. Based on the temperature measurement result, a relation diagram of the ambient temperature, the ambient pressure, the engine speed, the engine torque, the engine air inlet temperature, the engine working time and the cylinder cover temperature can be obtained, and the second MAP group is obtained. Performing a cylinder head temperature measurement test in an environment simulating a plateau to obtain a second plateau MAP; and performing a cylinder head temperature measurement test in an environment simulating plain to obtain a second plain MAP.

When the temperature of the cylinder cover reaches the temperature-resistant limit value of the cylinder cover, the corresponding engine working time is the temperature-rise time limit value, namely, under a certain environment temperature and a certain environment pressure, the engine works at a certain rotating speed, a certain torque and a certain air inlet temperature, the temperature of the cylinder cover can be gradually increased, and the engine working time when the temperature of the cylinder cover is increased from 0 ℃ to the temperature-resistant limit value of the cylinder cover is the temperature-rise time limit value. Therefore, the engine working time when the cylinder cover temperature reaches the cylinder cover temperature-resistant limit value can be obtained through the second MAP group under the conditions of different environment temperatures, different environment pressures, different engine speeds, different engine torques and different engine air inlet temperatures, and the temperature-rising time limit value is obtained.

S3: judging whether the actual cylinder cover cooling water outlet temperature is greater than or equal to the cylinder cover cooling water outlet temperature limit value; if yes, S4 is carried out; if not, returning to S1.

S4: the duration for which the ambient temperature, ambient pressure, engine actual rotational speed, engine actual torque, and engine actual intake air temperature at this time are all kept stable is calculated. When the actual cylinder cover cooling water outlet temperature is greater than or equal to the cylinder cover cooling water outlet temperature limit value, the duration that the environmental temperature, the environmental pressure, the actual engine rotating speed, the actual engine torque and the actual engine air inlet temperature are kept stable and unchanged is calculated.

S5: judging whether the duration time is more than or equal to the temperature rise time limit value; if yes, recording the engine oil temperature at the moment as an oil temperature recording value, and performing S6; if not, returning to S1.

S6: the fans of the electronic thermostat and the radiator are turned on, and the fans continue to operate for a set time. When the duration is greater than or equal to the temperature rise time limit value, the engine oil temperature is recorded, and the electronic thermostat and the fan are started, so that cooling water passes through the radiator, and after the cooling water is cooled by the fan, the cooling water returns to the cylinder cover cooling water channel, and the purpose of reducing the cylinder cover temperature is achieved.

S7: judging whether the actual cooling water outlet temperature of the cylinder cover is smaller than the outlet temperature limit value of the cooling water of the cylinder cover; if yes, the fans of the electronic thermostat and the radiator are turned off; if not, S8 is performed. After the electronic thermostat and the fan of the radiator are started for a set time, the actual cooling water outlet temperature of the cylinder cover is compared with the limiting value of the cooling water outlet temperature of the cylinder cover, and closed-loop control is carried out. When the actual cooling water outlet temperature of the cylinder cover is smaller than the limiting value of the cooling water outlet temperature of the cylinder cover, the electronic thermostat and the fan of the radiator are turned off.

S8: judging whether the actual engine oil temperature of the engine is smaller than an engine oil temperature record value or not; if not, executing the vehicle alarm protection strategy.

Specifically, the vehicle alarm protection strategy includes: alarming for abnormal temperature of the cylinder cover; and controlling the actual rotation speed of the engine to be smaller than or equal to the set rotation speed, and controlling the actual torque of the engine to be smaller than or equal to the set torque. When the radiator is damaged or the engine is in a limit environment, the actual cooling water outlet temperature of the cylinder cover cannot be regulated down and is continuously increased, in order to avoid the cylinder cover from being damaged, after the electronic thermostat and the fan are started, when the actual cooling water outlet temperature of the cylinder cover is not less than the limit value of the cooling water outlet temperature of the cylinder cover, and the actual engine oil temperature of the engine is not less than the engine oil temperature record value, the abnormal alarm of the cylinder cover temperature is carried out on an instrument panel of the vehicle to remind a driver of paying attention. Meanwhile, the actual rotation speed of the engine is limited not to be larger than the set rotation speed, and the actual torque of the engine is limited not to be larger than the set torque, so that the running safety of the vehicle is ensured.

Optionally, if the actual engine oil temperature of the engine is smaller than the engine oil temperature recorded value, an abnormal alarm of the cooling water temperature sensor is carried out. In order to prevent misjudgment caused by damage of the cooling water temperature sensor, when the actual cooling water outlet temperature of the cylinder cover is not less than the limiting value of the cooling water outlet temperature of the cylinder cover and the actual engine oil temperature of the engine is less than the engine oil temperature recorded value, the abnormal alarm of the cooling water temperature sensor is carried out to remind a driver to check in time.

Specifically, the engine is provided with an oil temperature sensor by which the actual oil temperature of the engine is detected.

The invention also provides a vehicle adopting the cylinder cover temperature control method, the vehicle comprises an engine, a radiator, an electronic thermostat and a water pump, the engine is provided with a cylinder cover cooling water channel and a cylinder body cooling water channel, a water outlet of the cylinder body cooling water channel is communicated with a water inlet of the cylinder cover cooling water channel, the radiator comprises a radiating water tank and a fan, the fan is used for cooling water in the radiating water tank, the electronic thermostat is provided with a first port, a second port and a third port, the first port is communicated with the water outlet of the cylinder cover cooling water channel, the second port is communicated with the input end of the water pump, the third port is communicated with the water inlet of the radiating water tank, the first port can be communicated with the second port or the third port, the water outlet of the radiating water tank is communicated with the input end of the water pump, and the output end of the water pump is communicated with the water inlet of the cylinder body cooling water channel.

When the electronic thermostat is opened, the first port is communicated with the third port, and cooling water returns to the cylinder cover cooling water channel after passing through the electronic thermostat, the radiating water tank, the water pump and the cylinder body cooling water channel from the cylinder cover cooling water channel.

When the electronic thermostat is closed, the first port and the second port are communicated, and cooling water returns to the cylinder cover cooling water channel after passing through the electronic thermostat, the water pump and the cylinder body cooling water channel from the cylinder cover cooling water channel.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. The cylinder cover temperature control method is characterized by comprising the following steps:

s1: detecting the environment temperature and the environment pressure of a vehicle in real time, and the actual rotation speed of an engine, the actual torque of the engine, the actual air inlet temperature of the engine and the actual water outlet temperature of cooling water of a cylinder cover;

s2: obtaining a cylinder cover cooling water outlet temperature limit and a temperature rise time limit according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine inlet temperature and a cylinder cover temperature resistance limit;

s3: judging whether the actual cooling water outlet temperature of the cylinder cover is greater than or equal to the limit value of the cooling water outlet temperature of the cylinder cover;

if yes, S4 is carried out;

if not, returning to the step S1;

s4: calculating a duration for which the ambient temperature, the ambient pressure, the engine actual rotational speed, the engine actual torque, and the engine actual intake air temperature are all kept stable;

s5: judging whether the duration time is more than or equal to the temperature rise time limit value;

if yes, recording the engine oil temperature at the moment as an oil temperature recording value, and performing S6;

if not, returning to the step S1;

s6: starting fans of the electronic thermostat and the radiator, and continuously working for a set time;

s7: judging whether the actual cooling water outlet temperature of the cylinder cover is smaller than the limit value of the cooling water outlet temperature of the cylinder cover;

if yes, closing the electronic thermostat and a fan of the radiator;

if not, S8 is carried out;

s8: judging whether the actual engine oil temperature of the engine is smaller than the engine oil temperature record value;

if not, executing the vehicle alarm protection strategy.

2. The cylinder head temperature control method according to claim 1, characterized in that a cooling water temperature sensor is arranged at a water outlet of a cylinder head cooling water channel, and the actual cooling water outlet temperature of the cylinder head is detected by the cooling water temperature sensor;

and S8, if the actual engine oil temperature of the engine is smaller than the engine oil temperature recorded value, carrying out abnormal alarm on a cooling water temperature sensor.

3. The cylinder head temperature control method according to claim 1, wherein obtaining a cylinder head cooling water outlet temperature limit value from the ambient temperature, the ambient pressure, the engine actual rotation speed, the engine actual torque, the engine actual intake air temperature, and a cylinder head temperature resistance limit value comprises:

and obtaining a cylinder cover cooling water outlet temperature limit value through a first MAP group according to the ambient temperature, the ambient pressure, the actual engine rotating speed, the actual engine torque, the actual engine inlet temperature and the cylinder cover temperature limit value.

4. The cylinder head temperature control method according to claim 3, wherein the first MAP group includes a first plateau MAP and a first plain MAP;

judging whether the environment where the vehicle is located is a plateau or a plain according to the environmental pressure;

if the environment where the vehicle is located is a plateau, obtaining a cylinder cover cooling water outlet temperature limit value through the first plateau MAP according to the environment temperature, the environment pressure, the actual engine rotating speed, the actual engine torque, the actual engine inlet air temperature and a cylinder cover temperature resistance limit value;

and if the environment where the vehicle is located is plain, obtaining a cylinder cover cooling water outlet temperature limit value through the first plain MAP according to the environment temperature, the environment pressure, the actual engine rotating speed, the actual engine torque, the actual engine air inlet temperature and the cylinder cover temperature resistance limit value.

5. The cylinder head temperature control method according to claim 1, wherein obtaining a temperature rise time limit from the ambient temperature, the ambient pressure, the engine actual rotation speed, the engine actual torque, the engine actual intake air temperature, and the cylinder head temperature resistance limit includes:

and obtaining a temperature rise time limit value through a second MAP group according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine air inlet temperature and the temperature resistance limit value of the cylinder cover.

6. The cylinder head temperature control method according to claim 5, wherein the second MAP group includes a second plateau MAP and a second plateau MAP;

according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature and the cylinder cover temperature resistance limit value, obtaining the temperature rise time limit value through a second MAP group comprises:

judging whether the environment where the vehicle is located is a plateau or a plain according to the environmental pressure;

if the environment where the vehicle is located is a plateau, obtaining a temperature rise time limit value through a second plateau MAP according to the environment temperature, the environment pressure, the actual engine speed, the actual engine torque, the actual engine air inlet temperature and the cylinder cover temperature resistance limit value;

and if the environment where the vehicle is located is plain, obtaining a temperature rise time limit value through a second plain MAP according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine air inlet temperature and the cylinder cover temperature resistance limit value.

7. The cylinder head temperature control method according to any one of claims 1 to 6, characterized in that the vehicle alarm protection strategy includes:

alarming for abnormal temperature of the cylinder cover;

and controlling the actual rotating speed of the engine to be smaller than or equal to the set rotating speed, and controlling the actual torque of the engine to be smaller than or equal to the set torque.

8. The cylinder head temperature control method according to any one of claims 1 to 6, characterized in that the cylinder head temperature resistance limit value is determined according to a material of a cylinder head.

9. The cylinder head temperature control method according to any one of claims 1 to 6, characterized in that the engine is provided with an oil temperature sensor by which an actual oil temperature of the engine is detected.

10. A vehicle, characterized in that the cylinder head temperature control method according to any one of claims 1 to 9 is employed, the vehicle comprising:

the engine is provided with a cylinder cover cooling water channel and a cylinder body cooling water channel, and a water outlet of the cylinder body cooling water channel is communicated with a water inlet of the cylinder cover cooling water channel;

the radiator comprises a radiating water tank and a fan, wherein the fan is used for cooling water in the radiating water tank;

the electronic thermostat is provided with a first port, a second port and a third port, the first port is communicated with a water outlet of the cylinder cover cooling water channel, the second port is communicated with an input end of the water pump, the third port is communicated with a water inlet of the radiating water tank, the first port can be communicated with the second port or the third port, a water outlet of the radiating water tank is communicated with an input end of the water pump, and an output end of the water pump is communicated with a water inlet of the cylinder body cooling water channel.

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