Piston cooling control method and device of engine and engine

Abstract

The invention discloses a piston cooling control method and device of an engine and the engine. The engine comprises a piston cooling adjusting device, and the piston cooling adjusting device comprises an oil pump control valve and a piston cooling nozzle; the piston cooling control method of the engine comprises the steps that engine oil pressure in the engine is monitored in real time; when it is monitored that the engine oil pressure in the engine is larger than the minimum allowable engine oil pressure, the current environment pressure and the current environment temperature are obtained; determining the current environment according to the current environment pressure and the current environment temperature; according to the current environment, a preset control strategy matched with the current environment is started to control the temperature of an engine piston; wherein the preset control strategy comprises a low-temperature environment control strategy, a normal-temperature environment control strategy and a plateau environment control strategy. Normal operation of the engine in various environments can be guaranteed, and safety risks are avoided.

Description

Technical Field

[0001] This invention relates to the field of engine piston cooling technology, and more particularly to an engine piston cooling control method, device, and engine. Background Technology

[0002] Pistons are crucial engine components. Low piston temperatures can lead to decreased engine thermal efficiency and hinder thermal management; conversely, excessively high piston temperatures can cause serious malfunctions such as burning and cap melting, posing significant safety hazards. This is especially true in extreme high-altitude environments, where thin air and reduced intake volume increase the internal heat load, causing piston temperatures to rise excessively, sometimes exceeding the piston material's temperature limits. This can result in piston burning, cap melting, and other malfunctions, posing significant safety risks.

[0003] Therefore, controlling the piston temperature within a reasonable range is essential to ensure the engine has excellent performance and avoid potential safety hazards. Summary of the Invention

[0004] This invention provides a piston cooling control method, device, and engine for an engine, which can ensure the normal operation of the engine under various environments and avoid safety risks.

[0005] In a first aspect, embodiments of the present invention provide a piston cooling control method for an engine, the engine including a piston cooling regulating device, the piston cooling regulating device including an oil pump control valve and a piston cooling nozzle;

[0006] The piston cooling control method for the engine includes:

[0007] Real-time monitoring of the engine oil pressure;

[0008] When the engine oil pressure is detected to be lower than the minimum allowable oil pressure, the current ambient pressure and current ambient temperature are obtained.

[0009] The current environment is determined based on the current environmental pressure and the current environmental temperature.

[0010] Based on the current environment, a preset control strategy matching the current environment is activated to control the temperature of the engine piston; wherein, the preset control strategy includes a low temperature environment control strategy, a normal temperature environment control strategy, and a high-altitude environment control strategy.

[0011] Optionally, before monitoring the oil pressure within the engine in real time, the method further includes:

[0012] A bench piston temperature measurement test was conducted under preset environments, and the engine's operating parameters were recorded simultaneously. The preset environments included low-temperature environments, normal-temperature environments, and high-altitude environments. The operating parameters included engine speed, torque, coolant temperature, oil temperature, intake air temperature, intake air pressure, and oil pressure.

[0013] Based on the operating parameters, the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment are determined.

[0014] Optionally, when the preset environment is a low-temperature environment or a normal-temperature environment, determining the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment based on the operating parameters includes:

[0015] Based on the operating parameters, the judgment boundary of the oil pump control valve is determined, forming the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment. The preset control strategy includes adjusting the opening degree of the oil pump control valve according to the MAP diagram corresponding to the operating parameters.

[0016] Optionally, when the preset environment is a high-altitude environment, determining the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment based on the operating parameters includes:

[0017] Based on the operating parameters and the temperature resistance limit of the engine piston material, a high-altitude environment control strategy and a minimum permissible oil pressure are formed for the high-altitude environment; wherein, the high-altitude environment control strategy includes adjusting the opening of the oil pump control valve according to the MAP diagram corresponding to the operating parameters, and controlling the fuel injection quantity of the engine injector according to the temperature resistance limit of the engine piston material.

[0018] Optionally, after monitoring the oil pressure in the engine in real time, the method further includes:

[0019] When the oil pressure in the engine is detected to be greater than the minimum allowable oil pressure, an abnormal oil pressure is reported, and the engine is controlled to limit the starting speed and torque.

[0020] Optionally, determining the current environment based on the current environmental pressure and the current environmental temperature includes:

[0021] When the current ambient temperature is within a preset low-temperature ambient temperature range and the ambient pressure is within a preset normal ambient pressure range, the current environment is determined to be a low-temperature environment.

[0022] When the current ambient temperature is within the preset normal ambient temperature range and the ambient pressure is within the preset normal ambient pressure range, the current environment is determined to be a normal ambient temperature environment.

[0023] When the environmental pressure is at the preset plateau environmental pressure, the current environment is determined to be a plateau environment.

[0024] Optionally, after controlling the engine piston temperature using a preset control strategy matching the current environment, the method further includes:

[0025] Obtain the opening degree of the oil pump control valve;

[0026] If the oil pump control valve does not move during the adjustment process, a fault report indicating that the oil pump control valve is stuck is issued based on the opening degree of the oil pump control valve.

[0027] Secondly, embodiments of the present invention also provide a piston cooling control device for an engine, comprising:

[0028] An engine operating parameter monitoring module is used to monitor the oil pressure in the engine in real time;

[0029] An environmental pressure acquisition module is used to acquire the current environmental pressure and current environmental temperature when the engine operating parameter monitoring module detects that the oil pressure in the engine is greater than the minimum allowable oil pressure.

[0030] The current environment determination module is used to determine the current environment based on the current environmental pressure and the current environmental temperature;

[0031] The oil pump control valve control module is used to control the temperature of the engine piston by activating a preset control strategy that matches the current environment; wherein, the preset control strategy includes a low temperature environment control strategy, a normal temperature environment control strategy, and a high-altitude environment control strategy.

[0032] Optional, also includes:

[0033] The operating parameter recording module is used to record the engine's operating parameters while conducting bench piston temperature measurement tests under preset environments; the preset environments include low temperature environment, normal temperature environment, and high-altitude environment; the operating parameters include engine speed, torque, coolant temperature, oil temperature, intake air temperature, intake air pressure, and oil pressure.

[0034] The preset control strategy and minimum allowable oil pressure determination module is used to determine the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment based on the operating parameters.

[0035] Thirdly, embodiments of the present invention also provide an engine, including a piston cooling adjustment device and the piston cooling control device described in the second aspect, wherein the piston cooling adjustment device includes an oil pump control valve and a piston cooling nozzle.

[0036] This invention provides a piston cooling control method, apparatus, and engine for an engine. The engine includes a piston cooling regulating device, which comprises an oil pump control valve and a piston cooling nozzle. The piston cooling control method includes: real-time monitoring of the engine oil pressure; when the monitored engine oil pressure exceeds the minimum permissible oil pressure, acquiring the current ambient pressure and current ambient temperature; determining the current environment based on the current ambient pressure and current ambient temperature; and, based on the current environment, activating a preset control strategy matched to the current environment to control the engine piston temperature. The preset control strategy includes a low-temperature environment control strategy, a normal-temperature environment control strategy, and a high-altitude environment control strategy. Based on the engine oil pressure, ambient pressure, and current ambient temperature, while ensuring the normal operation of the engine's lubrication system, the preset control strategy matched to the current environment is activated to control the engine piston temperature, maintaining the piston temperature at a suitable value. This takes into account the impact of extreme environments on the engine piston temperature, ensuring the normal operation of the engine under various environments and avoiding safety risks.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of a piston cooling control method for an engine provided in an embodiment of the present invention;

[0040] Figure 2 This is a flowchart of another piston cooling control method for an engine provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of a piston cooling control device for an engine provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of another piston cooling control device for an engine provided in an embodiment of the present invention. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] Figure 1 This is a flowchart of a piston cooling control method for an engine provided by an embodiment of the present invention. This embodiment is applicable to controlling piston cooling in different environments. The method can be executed by an engine piston cooling control device, which can be implemented in hardware and / or software. The engine includes a piston cooling adjustment device, which includes an oil pump control valve and piston cooling nozzles.

[0046] It should be noted that a piston cooling nozzle is a device used to cool the piston. Installed on the engine's oil passage, it controls the flow of engine oil to the piston's inner surface. The oil carries away heat from the piston through heat exchange, thus cooling it. The oil pump control valve can be an electromagnetic control valve.

[0047] refer to Figure 1 Engine piston cooling control methods include:

[0048] S110: Real-time monitoring of engine oil pressure.

[0049] It should be noted that oil pressure can reflect the working condition of the engine lubrication system.

[0050] S120. When the engine oil pressure is detected to be greater than the minimum allowable oil pressure, obtain the current ambient pressure and current ambient temperature.

[0051] It's important to note that excessively low oil pressure leads to poor lubrication, causing dry friction between metal parts. This can result in severe and irreversible damage to the engine, such as bearing seizure or engine failure, within a short period. When the engine oil pressure is higher than the minimum permissible oil pressure, it indicates that the engine lubrication system is functioning normally. In this case, while ensuring the lubrication system is operating normally, obtaining the current ambient pressure and temperature allows us to determine the engine's current environment and activate appropriate preset control strategies to regulate the engine piston temperature.

[0052] S130. Determine the current environment based on the current environmental pressure and current environmental temperature.

[0053] It is understandable that the current ambient pressure and temperature will affect the temperature of the engine piston. By determining the current environment based on the current ambient pressure and temperature, the influence of ambient pressure and temperature on the engine piston temperature can be taken into account, and then corresponding preset control strategies can be adopted to control the temperature of the engine piston.

[0054] S140. Based on the current environment, activate a preset control strategy that matches the current environment to control the temperature of the engine piston; wherein, the preset control strategy includes a low temperature environment control strategy, a normal temperature environment control strategy, and a high-altitude environment control strategy.

[0055] It is understandable that the low-temperature environment control strategy, normal temperature environment control strategy, and high-altitude environment control strategy are control strategies that have been calibrated in advance through experiments, taking into account the influence of different environments on the temperature of the engine piston. Specifically, the temperature of the engine piston can be controlled by adjusting the opening of the oil pump control valve and the amount of fuel injected by the engine injector.

[0056] Based on the engine oil pressure, ambient pressure, and current ambient temperature, this invention enables a preset control strategy that matches the current environment to control the engine piston temperature while ensuring the normal operation of the engine's lubrication system. This maintains the piston temperature at a suitable value, taking into account the impact of extreme environments on the engine piston temperature. This ensures the normal operation of the engine in various environments and avoids potential safety risks.

[0057] Figure 2 This is a flowchart of another piston cooling control method for an engine provided in an embodiment of the present invention, referred to... Figure 2 The method includes:

[0058] S210. Conduct bench piston temperature measurement tests under preset environments, and record engine operating parameters simultaneously. Preset environments include low temperature environment, normal temperature environment, and high-altitude environment. Operating parameters include engine speed, torque, coolant temperature, oil temperature, intake air temperature, intake air pressure, and oil pressure.

[0059] Among them, the ambient temperature of the low-temperature environment can be below -10℃, and the plateau environment can be an environment with an altitude above 1800m.

[0060] S220. Based on the operating parameters, determine the preset control strategy and minimum allowable oil pressure corresponding to the preset environment.

[0061] Specifically, during the bench piston temperature measurement test under a preset environment, the engine's current operating parameters are recorded. At the same time, the oil pump control valve opening and fuel injection quantity correction in application environments such as normal temperature, low temperature and high altitude are also recorded. Based on the operating parameters, the preset control strategy corresponding to the preset environment can be determined.

[0062] Understandably, to prevent abnormal piston temperature caused by abnormal oil pressure, the minimum permissible oil pressure is determined during the test and used as a basis for determining engine protection.

[0063] Optionally, before step S110 in the above embodiment, steps S210 to S220 are also included.

[0064] S230, real-time monitoring of engine oil pressure.

[0065] S240. When the engine oil pressure is detected to be greater than the minimum allowable oil pressure, obtain the current ambient pressure and current ambient temperature.

[0066] S250. Determine the current environment based on the current environmental pressure and current environmental temperature.

[0067] S260. Based on the current environment, activate a preset control strategy that matches the current environment to adjust the opening of the oil pump control valve; wherein, the preset control strategy includes a low temperature environment control strategy, a normal temperature environment control strategy, and a high-altitude environment control strategy.

[0068] Optionally, when the preset environment is a low temperature environment or a normal temperature environment, S220 includes: determining the judgment boundary of the oil pump control valve according to the operating parameters, forming a preset control strategy and a minimum allowable oil pressure corresponding to the preset environment; wherein, the preset control strategy includes adjusting the opening degree of the oil pump control valve according to the MAP diagram corresponding to the operating parameters.

[0069] Optionally, when the preset environment is a high-altitude environment, S220 includes: forming a high-altitude environment control strategy and a minimum permissible oil pressure corresponding to the high-altitude environment based on the operating parameters and the temperature resistance limit of the engine piston material; wherein, the high-altitude environment control strategy includes adjusting the opening of the oil pump control valve according to the MAP diagram corresponding to the operating parameters, and controlling the amount of oil injected by the engine injector according to the temperature resistance limit of the engine piston material.

[0070] This invention, based on changes in ambient temperature and pressure, adjusts the piston opening to ensure both piston reliability and engine economy. By combining parameters such as engine speed, load, intake air temperature, intake air pressure, and oil pressure, and adjusting the fuel injection quantity to incorporate a high-altitude correction strategy, piston temperature control can be achieved at different high-altitude boundaries, ensuring the piston operates within its normal range.

[0071] Understandably, for areas exceeding the temperature limit, a high-altitude correction control strategy can be added. By reducing the amount of fuel injected to lower the load, a high-oil quantity correction strategy based on the comprehensive influence of factors such as engine speed, torque, ambient temperature, and oil pressure can be obtained, thereby ensuring that the piston temperature meets the requirements in different load areas.

[0072] Optionally, after step S110 or step S230, the method further includes:

[0073] S270: When the engine oil pressure is detected to be lower than the minimum allowable oil pressure, an abnormal oil pressure is reported, and the engine starting speed and torque limit protection are controlled.

[0074] Optionally, step S130 or step S250 in the above embodiments may include: determining the current environment as a low-temperature environment when the current ambient temperature is within a preset low-temperature range and the ambient pressure is within a preset normal ambient pressure; determining the current environment as a normal temperature environment when the current ambient temperature is within a preset ambient temperature range and the ambient pressure is within a preset normal ambient pressure; and determining the current environment as a high-altitude environment when the ambient pressure is within a preset high-altitude ambient pressure.

[0075] Optionally, after step S140 or step S260, the method further includes:

[0076] S280, Obtain the opening degree of the oil pump control valve.

[0077] S290. If the oil pump control valve does not move during the adjustment process, an oil pump control valve stuck fault will be reported.

[0078] In this embodiment of the invention, when it is determined from the opening degree of the oil pump control valve that the oil pump control valve is not moving during the adjustment process, an oil pump control valve stuck fault is reported, which can further enhance the safety of the engine.

[0079] In summary, this invention, based on engine oil pressure, ambient pressure, and current ambient temperature, employs a preset control strategy matched to the current environment to control the engine piston temperature while ensuring the normal operation of the engine's lubrication system. This maintains the piston temperature at a suitable value, taking into account the impact of extreme environments on engine piston temperature, thus ensuring normal engine operation under various conditions and avoiding safety risks. Furthermore, by adjusting the opening degree based on changes in ambient temperature and pressure, both piston reliability and engine economy can be guaranteed. By combining parameters such as engine speed, load, intake air temperature, intake air pressure, and oil pressure, and adjusting the fuel injection quantity to incorporate a plateau correction strategy, piston temperature control can be achieved at different plateau boundaries, ensuring the piston operates within the normal range. Furthermore, by determining the opening degree of the oil pump control valve, if the oil pump control valve does not move during adjustment, an oil pump control valve sticking fault is reported, further enhancing engine safety.

[0080] Figure 3 This is a schematic diagram of the structure of a piston cooling control device for an engine provided in an embodiment of the present invention. (Refer to...) Figure 3 The device includes:

[0081] The engine operating parameter monitoring module 310 is used to monitor the oil pressure in the engine in real time; the environmental pressure acquisition module 320 is used to acquire the current environmental pressure and current environmental temperature when the engine operating parameter monitoring module detects that the oil pressure in the engine is greater than the minimum allowable oil pressure; the current environment determination module 330 is used to determine the current environment based on the current environmental pressure and current environmental temperature; the oil pump control valve control module 340 is used to activate a preset control strategy that matches the current environment to control the temperature of the engine piston; wherein, the preset control strategies include a low temperature environment control strategy, a normal temperature environment control strategy, and a high-altitude environment control strategy.

[0082] Figure 4 This is a schematic diagram of another piston cooling control device for an engine provided in an embodiment of the present invention. Optionally, based on the above embodiment, refer to... Figure 4 The device also includes:

[0083] The operating parameter recording module 410 is used to record the engine's operating parameters while conducting bench piston temperature measurement tests under preset environments. The preset environments include low temperature environment, normal temperature environment, and high-altitude environment. The operating parameters include engine speed, torque, coolant temperature, oil temperature, intake air temperature, intake air pressure, and oil pressure. The preset control strategy and minimum allowable oil pressure determination module 420 is used to determine the preset control strategy and minimum allowable oil pressure corresponding to the preset environment based on the operating parameters.

[0084] The piston cooling control device provided in the embodiments of the present invention can execute the piston cooling control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. For contents not described in detail in the embodiments of the present invention, please refer to the piston cooling control method provided in the above embodiments.

[0085] This invention also provides an engine, including a piston cooling adjustment device and a piston cooling control device provided in the above embodiments. The piston cooling adjustment device includes an oil pump control valve and a piston cooling nozzle.

[0086] The engine can be an engine used in mining equipment.

[0087] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0088] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A piston cooling control method for an engine, characterized in that, The engine includes a piston cooling regulating device, which includes an oil pump control valve and piston cooling nozzles. The piston cooling control method for the engine includes: Real-time monitoring of the engine oil pressure; When the engine oil pressure is detected to be greater than the minimum allowable oil pressure, the current ambient pressure and current ambient temperature are obtained. The current environment is determined based on the current environmental pressure and the current environmental temperature. Based on the current environment, a preset control strategy matching the current environment is activated to control the temperature of the engine piston; wherein, the preset control strategy includes a low temperature environment control strategy, a normal temperature environment control strategy, and a high-altitude environment control strategy.

2. The piston cooling control method for an engine according to claim 1, characterized in that, Before real-time monitoring of the oil pressure within the engine, the following is also included: A bench piston temperature measurement test was conducted under preset environments, and the engine's operating parameters were recorded simultaneously. The preset environments included low-temperature environments, normal-temperature environments, and high-altitude environments. The operating parameters included engine speed, torque, coolant temperature, oil temperature, intake air temperature, intake air pressure, and oil pressure. Based on the operating parameters, the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment are determined.

3. The piston cooling control method for an engine according to claim 2, characterized in that, When the preset environment is a low-temperature environment or a normal-temperature environment, the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment are determined according to the operating parameters, including: Based on the operating parameters, the judgment boundary of the oil pump control valve is determined, forming the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment; wherein, the preset control strategy includes adjusting the opening degree of the oil pump control valve according to the MAP diagram corresponding to the operating parameters.

4. The piston cooling control method for an engine according to claim 2, characterized in that, When the preset environment is a high-altitude environment, the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment are determined based on the operating parameters, including: Based on the operating parameters and the temperature resistance limit of the engine piston material, a high-altitude environment control strategy and a minimum permissible oil pressure are formed for the high-altitude environment; wherein, the high-altitude environment control strategy includes adjusting the opening of the oil pump control valve according to the MAP diagram corresponding to the operating parameters, and controlling the fuel injection quantity of the engine injector according to the temperature resistance limit of the engine piston material.

5. The piston cooling control method for an engine according to claim 1, characterized in that, After real-time monitoring of the oil pressure within the engine, the following is also included: When the oil pressure in the engine is detected to be lower than the minimum allowable oil pressure, an abnormal oil pressure is reported, and the engine is controlled to limit the starting speed and torque.

6. The piston cooling control method for an engine according to claim 1, characterized in that, Determining the current environment based on the current environmental pressure and the current environmental temperature includes: When the current ambient temperature is within a preset low-temperature ambient temperature range and the ambient pressure is within a preset normal ambient pressure range, the current environment is determined to be a low-temperature environment. When the current ambient temperature is within the preset normal ambient temperature range and the ambient pressure is within the preset normal ambient pressure range, the current environment is determined to be a normal ambient temperature environment. When the environmental pressure is at the preset plateau environmental pressure, the current environment is determined to be a plateau environment.

7. The piston cooling control method for an engine according to claim 1, characterized in that, After controlling the engine piston temperature using a preset control strategy that matches the current environment, the method further includes: Obtain the opening degree of the oil pump control valve; If the oil pump control valve does not move during the adjustment process, a fault report indicating that the oil pump control valve is stuck is issued based on the opening degree of the oil pump control valve.

8. A piston cooling control device for an engine, characterized in that, include: An engine operating parameter monitoring module is used to monitor the oil pressure in the engine in real time; An environmental pressure acquisition module is used to acquire the current environmental pressure and ambient temperature when the engine operating parameter monitoring module detects that the oil pressure in the engine is greater than the minimum allowable oil pressure. The current environment determination module is used to determine the current environment based on the current environmental pressure and the current environmental temperature; The oil pump control valve control module is used to control the temperature of the engine piston by activating a preset control strategy that matches the current environment; wherein, the preset control strategy includes a low temperature environment control strategy, a normal temperature environment control strategy, and a high-altitude environment control strategy.

9. The piston cooling control device for an engine according to claim 8, characterized in that, Also includes: The operating parameter recording module is used to record the engine's operating parameters while conducting bench piston temperature measurement tests under preset environments; the preset environments include low temperature environment, normal temperature environment, and high-altitude environment; the operating parameters include engine speed, torque, coolant temperature, oil temperature, intake air temperature, intake air pressure, and oil pressure. The preset control strategy and minimum allowable oil pressure determination module is used to determine the preset control strategy and the minimum allowable oil pressure corresponding to the preset environment based on the operating parameters.

10. An engine, characterized in that, The device includes a piston cooling adjustment device and a piston cooling control device as described in claim 9, wherein the piston cooling adjustment device includes an oil pump control valve and a piston cooling nozzle.

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