Cylinder head temperature control method and vehicle

Abstract

The present invention belongs to the technical field of vehicles, and discloses a cylinder head temperature control method and a vehicle. The cylinder head temperature control method obtains a limit value of the outlet water temperature of the cylinder head cooling water and a limit value of the temperature rise time according to the ambient temperature, ambient pressure, actual engine speed, actual engine torque, actual engine intake air temperature and the temperature resistance limit of the cylinder head. When the actual outlet water temperature of the cylinder head cooling water is greater than or equal to the limit value of the outlet water temperature of the cylinder head cooling water, and the duration during which the ambient temperature, ambient pressure, actual engine speed, actual engine torque and actual engine intake air temperature remain unchanged at this time is greater than or equal to the limit value of the temperature rise time, record the engine oil temperature as the oil temperature record value, and turn on the electronic thermostat and the radiator fan; when the actual outlet water temperature of the cylinder head cooling water is not less than the limit value of the outlet water temperature of the cylinder head cooling water, and the actual engine oil temperature is not less than the oil temperature record value, execute the vehicle alarm protection strategy. It can accurately judge the opening time of the electronic thermostat.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to a cylinder head temperature control method and a vehicle. Background Art

[0002] The cylinder head of an engine is an important component to ensure the normal operation of the engine. In a high-altitude environment, due to the thin air, the intake air volume of the engine decreases, causing an increase in the internal heat load of the cylinder, which easily leads to an excessively high temperature of the cylinder head, even exceeding the temperature resistance limit of the cylinder head, resulting in failures such as cracking of the cylinder head, presenting significant potential safety hazards. Moreover, in a plain environment, if the intake air temperature of the engine is too high, it may also cause an excessively high internal heat load of the cylinder, damaging the cylinder head. Therefore, it is necessary to control the temperature of the cylinder head within a reasonable range to ensure that the engine has excellent performance and avoid potential safety hazards. In the prior art, a wax thermostat and a radiator are used to cool the cooling water from the cylinder head. The stationary paraffin in the temperature-sensitive body of the wax thermostat melts as the temperature of the cooling water rises. When the temperature of the cooling water reaches the set temperature, the wax thermostat will open, guiding the cooling water from the cylinder head to the radiator for cooling. However, the opening condition of the wax thermostat is that when the temperature of the cooling water reaches a certain fixed temperature, and it is unable to change the timing of opening the thermostat according to the vehicle's environment and the actual operating conditions of the engine. There may be a situation of opening the thermostat too early or too late. Opening the thermostat too early will result in excessive fuel consumption, and opening the thermostat too late will cause the cylinder head to overheat and be damaged, presenting potential safety hazards. Summary of the Invention

[0003] The purpose of the present invention is to provide a cylinder head temperature control method and a vehicle to solve the problem in the prior art that a wax thermostat is used, and the opening condition of the wax thermostat is that when the temperature of the cooling water reaches a certain fixed temperature, and it is unable to change the timing of opening the thermostat according to the vehicle's environment and the actual operating conditions of the engine, which may result in opening the thermostat too early or too late.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A cylinder head temperature control method, comprising:

[0006] S1: Real-time detect the ambient temperature and ambient pressure of the vehicle, as well as the actual engine speed, actual engine torque, actual engine intake air temperature, and actual cylinder head cooling water outlet temperature;

[0007] S2: Obtain the limit value of the cylinder head cooling water outlet temperature and the limit value of the temperature rise time 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;

[0008] S3: Determine whether the actual cooling water outlet temperature of the cylinder head is greater than or equal to the limit value of the cooling water outlet temperature of the cylinder head;

[0009] If so, proceed to S4;

[0010] If not, return to S1;

[0011] S4: Calculate the duration during which the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, and the actual engine intake temperature remain stable and unchanged at this time;

[0012] S5: Determine whether the duration is greater than or equal to the warm-up time limit value;

[0013] If so, record the engine oil temperature at this time as the oil temperature record value, and proceed to S6;

[0014] If not, return to S1;

[0015] S6: Turn on the electric thermostat and the radiator fan, and the fan operates continuously for a set time;

[0016] S7: Determine whether the actual cooling water outlet temperature of the cylinder head is less than the limit value of the cooling water outlet temperature of the cylinder head;

[0017] If so, turn off the electric thermostat and the radiator fan;

[0018] If not, proceed to S8;

[0019] S8: Determine whether the actual engine oil temperature is less than the oil temperature record value;

[0020] If not, execute the vehicle alarm protection strategy.

[0021] As a preferred solution of the above cylinder head temperature control method, a cooling water temperature sensor is provided at the outlet of the cylinder head cooling water passage, and the actual cooling water outlet temperature of the cylinder head is detected by the cooling water temperature sensor;

[0022] In S8, if the actual engine oil temperature is less than the oil temperature record value, an alarm for abnormal cooling water temperature sensor is given.

[0023] As a preferred solution of the above cylinder head temperature control method, obtaining the limit value of the cooling water outlet temperature of the cylinder head according to the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake temperature, and the cylinder head temperature resistance limit value includes:

[0024] Based on 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, the outlet water temperature limit of the cylinder head cooling water is obtained through the first MAP group.

[0025] As a preferred solution of the above cylinder head temperature control method, the first MAP group includes a first plateau MAP and a first plain MAP;

[0026] Based on the ambient pressure, it is determined whether the environment where the vehicle is located is a plateau or a plain;

[0027] If the environment where the vehicle is located is a plateau, then based on 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, the outlet water temperature limit of the cylinder head cooling water is obtained through the first plateau MAP;

[0028] If the environment where the vehicle is located is a plain, then based on 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, the outlet water temperature limit of the cylinder head cooling water is obtained through the first plain MAP.

[0029] As a preferred solution of the above cylinder head temperature control method, obtaining the warm-up time limit based on 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:

[0030] Based on 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, the warm-up time limit is obtained through the second MAP group.

[0031] As a preferred solution of the above cylinder head temperature control method, the second MAP group includes a second plateau MAP and a second plain MAP;

[0032] Based on 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, obtaining the warm-up time limit through the second MAP includes:

[0033] Based on the ambient pressure, it is determined whether the environment where the vehicle is located is a plateau or a plain;

[0034] If the environment where the vehicle is located is a plateau, then based on 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, the warm-up time limit is obtained through the second plateau MAP;

[0035] If the environment where the vehicle is located is a plain, then 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, the warm-up time limit is obtained through the second plain MAP.

[0036] As a preferred solution of the above cylinder head temperature control method, the vehicle alarm protection strategy includes:

[0037] Carry out abnormal alarm of cylinder head temperature;

[0038] Control the actual engine speed to be less than or equal to the set speed, and the actual engine torque to be less than or equal to the set torque.

[0039] As a preferred solution of the above cylinder head temperature control method, the cylinder head temperature resistance limit is determined according to the material of the cylinder head.

[0040] As a preferred solution of the above cylinder head temperature control method, the engine is equipped with an engine oil temperature sensor, and the actual engine oil temperature is detected through the engine oil temperature sensor.

[0041] The present invention also provides a vehicle, which adopts the above cylinder head temperature control method, and the vehicle includes:

[0042] An engine, the engine is provided with a cylinder head cooling water channel and a cylinder block cooling water channel, and the water outlet of the cylinder block cooling water channel is communicated with the water inlet of the cylinder head cooling water channel;

[0043] A radiator, the radiator includes a cooling water tank and a fan, and the fan is used to cool the cooling water in the cooling water tank;

[0044] An electronic thermostat and a water pump, the electronic thermostat has a first port, a second port, and a third port, the first port is communicated with the water outlet of the cylinder head 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 cooling water tank, the first port can be communicated with the second port or the third port, the water outlet of the cooling 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 block cooling water channel.

[0045] Advantages of the present invention:

[0046] The present invention provides a cylinder head temperature control method and a vehicle. The cylinder head temperature control method obtains a cylinder head cooling water outlet temperature limit value and a heating-up time limit value according to the ambient temperature, ambient pressure, actual engine speed, actual engine torque, actual engine intake air temperature, and cylinder head temperature resistance limit value. When the actual cylinder head cooling water outlet temperature is greater than or equal to the cylinder head cooling water outlet temperature limit value, and the duration during which the ambient temperature, ambient pressure, actual engine speed, actual engine torque, and actual engine intake air temperature remain stable and unchanged at this time is also greater than or equal to the heating-up time limit value, the electronic thermostat and the radiator fan are turned on to cool the cooling water, and the engine oil temperature at this time is recorded as the oil temperature record value. After the fan has been operating continuously for a set time, it is determined whether the actual cylinder head cooling water outlet temperature is less than the cylinder head cooling water outlet temperature limit value; if so, the electronic thermostat and the radiator fan are turned off, achieving the purpose of cooling the cylinder head; if not, it is determined whether the actual engine oil temperature is less than the oil temperature record value; if the actual engine oil temperature is not less than the oil temperature record value, the vehicle alarm protection strategy is executed. If the actual cylinder head cooling water outlet temperature is not less than the cylinder head cooling water outlet temperature limit value, and the actual engine oil temperature is not less than the oil temperature record value, it proves that the purpose of cooling the cylinder head has not been achieved, the cylinder head temperature may be continuously rising, there is a certain safety risk, and the vehicle alarm protection strategy needs to be executed.

[0047] The cylinder head temperature control method determines the opening and closing times of the electronic thermostat and the fan according to the cylinder head cooling water outlet temperature limit value and the heating-up time limit value obtained from the ambient temperature, ambient pressure, actual engine speed, actual engine torque, actual engine intake air temperature, and cylinder head temperature resistance limit value. It comprehensively considers the actual environment and the actual operating conditions of the engine, can accurately determine the opening or closing times of the electronic thermostat and the fan, can reduce fuel consumption and improve safety. Moreover, after the electronic thermostat and the fan have been turned on for a set time, if the actual cylinder head cooling water outlet temperature is still not less than the cylinder head cooling water outlet temperature limit value, it is determined whether the actual engine oil temperature is less than the oil temperature record value. If the actual engine oil temperature is not less than the oil temperature record value, the vehicle alarm protection strategy is executed. Adding the comparison between the actual engine oil temperature and the oil temperature record value can prevent misjudgment caused by damage to the cooling water temperature sensor for detecting the cooling water temperature, and improve the accuracy of cylinder head temperature control, the fuel economy of engine operation, and the safety of vehicle driving. Brief Description of the Drawings

[0048] Figure 1 is a flowchart of the cylinder head temperature control method provided by a specific embodiment of the present invention. Detailed Embodiments

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0050] In the description of the present invention, unless otherwise clearly specified and defined, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0052] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0053] The present invention provides a cylinder head temperature control method, as Figure 1 shown, the cylinder head temperature control method includes:

[0054] S1: Real-time detect the ambient temperature and ambient pressure of the vehicle, as well as the actual engine speed, actual engine torque, actual engine intake temperature, and actual cylinder head cooling water outlet temperature.

[0055] S2: Obtain the cylinder head cooling water outlet temperature limit value and the heating time limit value according to the ambient temperature, ambient pressure, actual engine speed, actual engine torque, actual engine intake temperature, and the cylinder head temperature resistance limit value.

[0056] Among them, the temperature resistance limit value of the cylinder head is determined according to the material of the cylinder head.

[0057] Specifically, according to the ambient temperature, ambient pressure, actual engine speed, actual engine torque, actual engine intake temperature, and the temperature resistance limit value of the cylinder head, the outlet water temperature limit value of the cylinder head cooling water is obtained through the first MAP group. Among them, the first MAP group includes the first plateau MAP and the first plain MAP; according to the ambient pressure, it is judged whether the vehicle is in a plateau or plain environment; if the vehicle is in a plateau environment, the outlet water temperature limit value of the cylinder head cooling water is obtained through the first plateau MAP; if the vehicle is in a plain environment, the outlet water temperature limit value of the cylinder head cooling water is obtained through the first plain MAP.

[0058] The first plateau MAP and the first plain MAP are obtained through the previous bench test of measuring the temperature of the cylinder head. When conducting the bench test of measuring the temperature of the cylinder head, the engine works at different speeds, different torques, and different intake temperatures under different ambient temperatures and different ambient pressures, and the corresponding outlet water temperature of the cylinder head cooling water and the cylinder head temperature are recorded. Based on the temperature measurement results, a relationship diagram of the ambient temperature, ambient pressure, engine speed, engine torque, engine intake temperature, cylinder head temperature, and outlet water temperature of the cylinder head cooling water can be obtained, that is, the first MAP group is obtained. The first plateau MAP is obtained by conducting the bench test of measuring the temperature of the cylinder head in a simulated plateau environment; the first plain MAP is obtained by conducting the bench test of measuring the temperature of the cylinder head in a simulated plain environment.

[0059] The outlet water temperature of the cylinder head cooling water corresponding to when the cylinder head temperature reaches the temperature resistance limit value of the cylinder head is the outlet water temperature limit value of the cylinder head cooling water. Through the first MAP group, the outlet water temperature of the cylinder head cooling water when the cylinder head temperature reaches the temperature resistance limit value of the cylinder head under different ambient temperatures, different ambient pressures, different engine speeds, different engine torques, and different engine intake temperatures can be obtained, that is, the outlet water temperature limit value of the cylinder head cooling water is obtained.

[0060] Specifically, according to the ambient temperature, ambient pressure, actual engine speed, actual engine torque, actual engine intake temperature, and the temperature resistance limit value of the cylinder head, the warm-up time limit value is obtained through the second MAP group. Among them, the second MAP group includes the second plateau MAP and the second plain MAP; according to the ambient pressure, it is judged whether the vehicle is in a plateau or plain environment; if the vehicle is in a plateau environment, the warm-up time limit value is obtained through the second plateau MAP; if the vehicle is in a plain environment, the warm-up time limit value is obtained through the second plain MAP.

[0061] The second plateau MAP and the second plain MAP are obtained through the previous bench cylinder head temperature measurement test. When conducting the cylinder head temperature measurement test, the engine operates at different speeds, different torques, and different intake temperatures under different ambient temperatures and different ambient pressures, and the cylinder head temperature is recorded corresponding to the increase in the engine operating time. Based on the temperature measurement results, a relationship diagram of ambient temperature, ambient pressure, engine speed, engine torque, engine intake temperature, engine operating time, and cylinder head temperature can be obtained, that is, the second MAP group is obtained. The second plateau MAP is obtained by conducting the cylinder head temperature measurement test in a simulated plateau environment; the second plain MAP is obtained by conducting the cylinder head temperature measurement test in a simulated plain environment.

[0062] The engine operating time corresponding to when the cylinder head temperature reaches the cylinder head temperature resistance limit is the heating time limit. That is, under a certain ambient temperature and a certain ambient pressure, when the engine operates at a certain speed, a certain torque, and a certain intake temperature, the cylinder head temperature will gradually increase. The engine operating time when the cylinder head temperature rises from 0°C to the cylinder head temperature resistance limit is the heating time limit. Thus, through the second MAP group, the engine operating time when the cylinder head temperature reaches the cylinder head temperature resistance limit under different ambient temperatures, different ambient pressures, different engine speeds, different engine torques, and different engine intake temperatures can be obtained, that is, the heating time limit is obtained.

[0063] S3: Determine whether the actual cooling water outlet temperature of the cylinder head is greater than or equal to the cylinder head cooling water outlet temperature limit; if so, proceed to S4; if not, return to S1.

[0064] S4: Calculate the duration during which the ambient temperature, ambient pressure, actual engine speed, actual engine torque, and actual engine intake temperature remain stable and unchanged at this time. That is, calculate the duration during which the ambient temperature, ambient pressure, actual engine speed, actual engine torque, and actual engine intake temperature remain stable and unchanged when the actual cooling water outlet temperature of the cylinder head is greater than or equal to the cylinder head cooling water outlet temperature limit.

[0065] S5: Determine whether the duration is greater than or equal to the heating time limit; if so, record the engine oil temperature at this time as the oil temperature record value, and proceed to S6; if not, return to S1.

[0066] S6: Turn on the electronic thermostat and the radiator fan, and the fan operates continuously for a set time. When the duration is greater than or equal to the heating time limit, record the engine oil temperature, and turn on the electronic thermostat and the fan to allow the cooling water to pass through the radiator. After the fan cools the cooling water, the cooling water returns to the cylinder head cooling water channel to achieve the purpose of reducing the cylinder head temperature.

[0067] S7: Determine whether the actual outlet water temperature of the cylinder head cooling water is less than the limit value of the cylinder head cooling water outlet temperature; if so, close the electronic thermostat and the radiator fan; if not, proceed to S8. After the set time for turning on the electronic thermostat and the radiator fan, compare the actual outlet water temperature of the cylinder head with the limit value of the cylinder head cooling water outlet temperature again for closed-loop control. When the actual outlet water temperature of the cylinder head is less than the limit value of the cylinder head cooling water outlet temperature, close the electronic thermostat and the radiator fan.

[0068] S8: Determine whether the actual engine oil temperature is less than the recorded oil temperature value; if not, execute the vehicle alarm protection strategy.

[0069] Specifically, the vehicle alarm protection strategy includes: giving an alarm for abnormal cylinder head temperature; controlling the actual engine speed to be less than or equal to the set speed, and the actual engine torque to be less than or equal to the set torque. When the radiator is damaged or the engine is in an extreme environment and the actual outlet water temperature of the cylinder head cooling water cannot be lowered and continues to rise, in order to avoid damage to the cylinder head, after turning on the electronic thermostat and the fan, when the actual outlet water temperature of the cylinder head cooling water is not less than the limit value of the cylinder head cooling water outlet temperature and the actual engine oil temperature is not less than the recorded oil temperature value, give an alarm for abnormal cylinder head temperature on the vehicle dashboard to remind the driver to pay attention. At the same time, limit the actual engine speed not to be greater than the set speed and the actual engine torque not to be greater than the set torque to ensure the safety of vehicle driving.

[0070] Optionally, if the actual engine oil temperature is less than the recorded oil temperature value, give an alarm for abnormal cooling water temperature sensor. To prevent misjudgment caused by damage to the cooling water temperature sensor, when the actual outlet water temperature of the cylinder head cooling water is not less than the limit value of the cylinder head cooling water outlet temperature and the actual engine oil temperature is less than the recorded oil temperature value, give an alarm for abnormal cooling water temperature sensor to remind the driver to check in time.

[0071] Specifically, the engine is equipped with an oil temperature sensor, and the actual engine oil temperature is detected by the oil temperature sensor.

[0072] The present invention also provides a vehicle that adopts the above cylinder head temperature control method. The vehicle includes an engine, a radiator, an electronic thermostat, and a water pump. The engine is provided with a cylinder head cooling water channel and a cylinder block cooling water channel. The outlet of the cylinder block cooling water channel is communicated with the inlet of the cylinder head cooling water channel. The radiator includes a radiator water tank and a fan, and the fan is used to cool the cooling water in the radiator water tank. The electronic thermostat has a first port, a second port, and a third port. The first port is communicated with the outlet of the cylinder head cooling water channel, the second port is communicated with the input end of the water pump, and the third port is communicated with the inlet of the radiator water tank. The first port can be communicated with the second port or the third port. The outlet of the radiator water tank is communicated with the input end of the water pump, and the output end of the water pump is communicated with the inlet of the cylinder block cooling water channel.

[0073] When the electronic thermostat is opened, the first port and the third port are connected, and the cooling water returns to the cylinder head cooling water passage after passing through the electronic thermostat, the radiator, the water pump and the cylinder block cooling water passage from the cylinder head cooling water passage.

[0074] When the electronic thermostat is closed, the first port and the second port are connected, and the cooling water returns to the cylinder head cooling water passage after passing through the electronic thermostat, the water pump and the cylinder block cooling water passage from the cylinder head cooling water passage.

[0075] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A method for controlling the temperature of a cylinder head, characterized in that, Including: S1: Detect the ambient temperature and ambient pressure of the vehicle in real time, as well as the actual engine speed, actual engine torque, actual engine intake air temperature, and actual cooling water outlet temperature of the cylinder head; S2: Obtain the cooling water outlet temperature limit value and the heating time limit value of the cylinder head based on the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature, and the temperature resistance limit of the cylinder head; S3: Determine whether the actual cooling water outlet temperature of the cylinder head is greater than or equal to the cooling water outlet temperature limit value of the cylinder head; If so, proceed to S4; If not, return to S1; S4: Calculate the duration during which the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, and the actual engine intake air temperature remain stable and unchanged at this time; S5: Determine whether the duration is greater than or equal to the heating time limit value; If so, record the engine oil temperature at this time as the oil temperature record value, and proceed to S6; If not, return to S1; S6: Turn on the electronic thermostat and the radiator fan, and the fan operates continuously for a set time; S7: Determine whether the actual cooling water outlet temperature of the cylinder head is less than the cooling water outlet temperature limit value of the cylinder head; If so, turn off the electronic thermostat and the radiator fan; If not, proceed to S8; S8: Determine whether the actual engine oil temperature is less than the oil temperature record value; If not, execute the vehicle alarm protection strategy.

2. The cylinder head temperature control method according to claim 1, wherein A cooling water temperature sensor is provided at the outlet of the cylinder head cooling water channel, and the actual cooling water outlet temperature of the cylinder head is detected through the cooling water temperature sensor; In S8, if the actual engine oil temperature is less than the oil temperature record value, an alarm for abnormal cooling water temperature sensor is given.

3. The cylinder head temperature control method according to claim 1, characterized in that Obtaining the cooling water outlet temperature limit value of the cylinder head based on the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature, and the temperature resistance limit of the cylinder head includes: Obtaining the cooling water outlet temperature limit value of the cylinder head through the first MAP group based on the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature, and the temperature resistance limit of the cylinder head.

4. The cylinder head temperature control method according to claim 3, characterized in that The first MAP group includes a first plateau MAP and a first plain MAP; Based on the ambient pressure, determine whether the environment where the vehicle is located is a plateau or a plain; If the environment where the vehicle is located is a plateau, obtain the cooling water outlet temperature limit value of the cylinder head through the first plateau MAP based on the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature, and the temperature resistance limit of the cylinder head; If the environment where the vehicle is located is a plain, obtain the cooling water outlet temperature limit value of the cylinder head through the first plain MAP based on the ambient temperature, the ambient pressure, the actual engine speed, the actual engine torque, the actual engine intake air temperature, and the temperature resistance limit of the cylinder head.

5. The cylinder head temperature control method according to claim 1, characterized in that, Obtaining the warm-up time limit value based on 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 value includes: Based on 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 value, obtaining the warm-up time limit value through the second MAP group.

6. The cylinder head temperature control method according to claim 5, characterized in that, The second MAP group includes a second plateau MAP and a second plain MAP; Based on 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 value, obtaining the warm-up time limit value through the second MAP group includes: Judging whether the environment where the vehicle is located is a plateau or a plain according to the ambient pressure; If the environment where the vehicle is located is a plateau, then based on 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 value, obtaining the warm-up time limit value through the second plateau MAP; If the environment where the vehicle is located is a plain, then based on 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 value, obtaining the warm-up time limit value through the second plain MAP.

7. The cylinder head temperature control method according to any one of claims 1-6, characterized in that, The vehicle alarm protection strategy includes: Conducting abnormal alarm for the cylinder head temperature; Controlling the actual engine speed to be less than or equal to the set speed and the actual engine torque to be less than or equal to the set torque.

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

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

10. A vehicle, characterized in that, Adopting the cylinder head temperature control method according to any one of claims 1-9, the vehicle includes: An engine, the engine is provided with a cylinder head cooling water channel and a cylinder block cooling water channel, and the water outlet of the cylinder block cooling water channel is communicated with the water inlet of the cylinder head cooling water channel; A radiator, the radiator includes a radiator water tank and a fan, and the fan is used for cooling the cooling water in the radiator water tank; An electronic thermostat and a water pump, the electronic thermostat has a first port, a second port and a third port, the first port is communicated with the water outlet of the cylinder head 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 radiator water tank, the first port can be communicated with the second port or the third port, the water outlet of the radiator 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 block cooling water channel.

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