Piston cooling control system, method and computer equipment

Abstract

This application relates to a piston cooling control system, method, and computer equipment. The system includes: a piston; a piston cooling nozzle disposed below the piston for spraying cooling oil onto the piston; a piston cooling control valve disposed on the piston cooling nozzle for controlling the amount of cooling oil sprayed from the piston cooling nozzle; a piston cooling oil passage disposed below and connected to the piston cooling control valve; a temperature and pressure sensor connected to the piston cooling oil passage for collecting the cooling oil temperature and pressure of the piston cooling oil passage; and an electronic control unit connected to the piston cooling control valve and the temperature and pressure sensor for controlling the piston cooling control valve based on the cooling oil temperature and pressure of the piston cooling oil passage, thereby controlling the amount of cooling oil sprayed from the piston cooling nozzle. This method enables precise control of the piston's cooling oil spray volume, improving fuel efficiency.

Description

Technical Field

[0001] This application relates to the field of piston cooling control technology, and in particular to a piston cooling control system, method and computer equipment. Background Technology

[0002] The piston is one of the key components of an engine. During engine operation, the piston is subjected to high temperature and high pressure loads, making piston heat dissipation and cooling crucial for engine design and development. Insufficient cooling can lead to piston deformation, carbon buildup, and even cylinder scoring. Excessive cooling, on the other hand, can result in heat loss from the engine, increased oil pump power consumption, and poor fuel economy.

[0003] In traditional technologies, all piston cooling nozzles are controlled by a single control valve, which results in imprecise control and poor fuel-saving performance. Summary of the Invention

[0004] Therefore, it is necessary to provide a piston cooling control system, method, and computer equipment that can precisely control the amount of cooling oil injected into the piston and improve fuel efficiency, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a piston cooling control system, comprising:

[0006] piston;

[0007] A piston cooling nozzle is disposed below the piston and is used to spray cooling oil onto the piston;

[0008] A piston cooling control valve is installed on the piston cooling nozzle and is used to control the amount of cooling oil injected into the piston cooling nozzle.

[0009] A piston cooling oil passage is located below the piston cooling control valve and is connected to the piston cooling control valve;

[0010] A temperature and pressure sensor is connected to the piston cooling oil passage to collect the cooling oil temperature and pressure of the piston cooling oil passage.

[0011] An electronic control unit, connected to the piston cooling control valve and the temperature and pressure sensor, is used to acquire the cooling oil temperature and pressure of the piston cooling oil passage collected by the temperature and pressure sensor, and to control the piston cooling control valve according to the cooling oil temperature and pressure of the piston cooling oil passage, so as to control the amount of cooling oil injected by the piston cooling nozzle.

[0012] In one embodiment, the piston cooling control system includes multiple pistons, with a piston cooling nozzle disposed below each piston, and a piston cooling control valve disposed at the oil inlet of each piston cooling nozzle; the piston cooling control valve is used to control the amount of cooling oil injected into the corresponding piston cooling nozzle.

[0013] In one embodiment, the electronic control unit is used to control the opening and closing state of the piston cooling control valve according to the cooling oil temperature and cooling oil pressure of the piston cooling oil passage, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle.

[0014] In one embodiment, the electronic control unit is used to identify whether the cooling oil pressure of the piston cooling oil passage is within the normal pressure range when the engine is running; when the cooling oil pressure of the piston cooling oil passage is within the normal pressure range, it identifies whether the cooling oil temperature of the piston cooling oil passage is lower than a preset temperature; when the cooling oil temperature of the piston cooling oil passage is lower than the preset temperature, it controls the piston cooling control valve to be fully open.

[0015] In one embodiment, the electronic control unit is further configured to identify whether the engine is in a non-firing operating state when the cooling oil temperature of the piston cooling oil passage is not lower than a preset temperature; when the engine is in a non-firing operating state, the electronic control unit controls the opening and closing state of the piston cooling control valve according to a phase control strategy to control the amount of cooling oil injected by the corresponding piston cooling nozzle.

[0016] In one embodiment, the electronic control unit is further configured to control the crankshaft angle and opening degree of the piston cooling control valve according to a phase control strategy, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle; wherein the crankshaft angle of the piston cooling control valve is less than a first preset angle.

[0017] In one embodiment, the electronic control unit is further configured to control the opening and closing state of the piston cooling control valve according to the fuel injection quantity control strategy when the engine is in the firing state, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle.

[0018] In one embodiment, the electronic control unit is further configured to control the crankshaft angle, opening degree, or injection timing of the piston cooling control valve according to the fuel injection quantity control strategy, so as to control the opening and closing state of the piston cooling control valve.

[0019] Secondly, this application also provides a piston cooling control method, applied to the electronic control unit in the piston cooling control system described in the first aspect, the method comprising:

[0020] With the engine running, the cooling oil pressure and cooling oil temperature of the piston cooling oil passage are acquired by the temperature and pressure sensor.

[0021] When it is detected that the cooling oil pressure in the piston cooling oil passage is within the normal pressure range, but the cooling oil temperature in the piston cooling oil passage is greater than or equal to the preset temperature, it is determined whether the engine is in a non-firing working state, and the working state identification result is obtained.

[0022] Based on the working state identification result, a corresponding control strategy is determined to control the opening and closing state of the piston cooling control valve, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection quantity control strategy.

[0023] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0024] With the engine running, the cooling oil pressure and cooling oil temperature of the piston cooling oil passage are acquired by the temperature and pressure sensor.

[0025] When it is detected that the cooling oil pressure in the piston cooling oil passage is within the normal pressure range, but the cooling oil temperature in the piston cooling oil passage is greater than or equal to the preset temperature, it is determined whether the engine is in a non-firing working state, and the working state identification result is obtained.

[0026] Based on the working state identification result, a corresponding control strategy is determined to control the opening and closing state of the piston cooling control valve, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection quantity control strategy.

[0027] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0028] With the engine running, the cooling oil pressure and cooling oil temperature of the piston cooling oil passage are acquired by the temperature and pressure sensor.

[0029] When it is detected that the cooling oil pressure in the piston cooling oil passage is within the normal pressure range, but the cooling oil temperature in the piston cooling oil passage is greater than or equal to the preset temperature, it is determined whether the engine is in a non-firing working state, and the working state identification result is obtained.

[0030] Based on the working state identification result, a corresponding control strategy is determined to control the opening and closing state of the piston cooling control valve, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection quantity control strategy.

[0031] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0032] With the engine running, the cooling oil pressure and cooling oil temperature of the piston cooling oil passage are acquired by the temperature and pressure sensor.

[0033] When it is detected that the cooling oil pressure in the piston cooling oil passage is within the normal pressure range, but the cooling oil temperature in the piston cooling oil passage is greater than or equal to the preset temperature, it is determined whether the engine is in a non-firing working state, and the working state identification result is obtained.

[0034] Based on the working state identification result, a corresponding control strategy is determined to control the opening and closing state of the piston cooling control valve, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection quantity control strategy.

[0035] The aforementioned piston cooling control system, method, computer equipment, storage medium, and computer program products, by installing piston cooling control valves on the piston cooling nozzles, enable individual control of the piston cooling nozzles. The electronic control unit acquires the cooling oil temperature and pressure from temperature and pressure sensors in the piston cooling oil passages. Taking both cooling oil temperature and pressure into account, the control valves are adjusted to ensure the piston cooling nozzles inject the appropriate amount of cooling oil at the correct time, improving piston cooling efficiency. This allows for precise control of the piston cooling oil injection quantity, improving fuel economy and ensuring each piston operates within its optimal temperature range. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the piston cooling control system in one embodiment;

[0038] Figure 2 This is a schematic diagram of the normal pressure range curve in one embodiment;

[0039] Figure 3 This is a schematic diagram of the piston cooling control valve opening control curve corresponding to the phase control strategy in one embodiment.

[0040] Figure 4 This is a schematic diagram of the piston cooling control valve control curve corresponding to the fuel injection quantity control strategy in one embodiment.

[0041] Figure 5 This is a schematic flowchart of a piston cooling control method in one embodiment;

[0042] Figure 6 This is an internal structural diagram of a computer device in one embodiment.

[0043] Explanation of reference numerals in the attached diagram: 1. Electronic control unit; 2. Temperature and pressure sensor; 3. Piston cooling oil passage; 4. Piston cooling control valve; 5. Piston cooling nozzle; 6. Piston. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] For the piston cooling control system provided in this application embodiment, please refer to [link / reference needed]. Figure 1 The piston cooling control system includes an Electronic Control Unit (ECU) 1, a temperature and pressure sensor 2, a piston cooling oil passage 3, a piston cooling control valve 4, a piston cooling nozzle 5, and a piston 6. Specifically: the piston cooling nozzle 5 is located below the piston 6 and is used to spray cooling oil onto the piston 6. The piston cooling control valve 4 is located on the piston cooling nozzle 5 and is used to control the amount of cooling oil sprayed from the piston cooling nozzle 5. The piston cooling oil passage 3 is located below the piston cooling control valve 4 and is connected to it. The piston cooling oil passage 3 supplies cooling oil to the piston cooling nozzle 5. The temperature and pressure sensor 2 is connected to the piston cooling oil passage 3 and is used to collect the cooling oil temperature and pressure of the piston cooling oil passage 3. The ECU 1 is connected to the piston cooling control valve 4 and the temperature and pressure sensor 2, and is used to acquire the cooling oil temperature and pressure of the piston cooling oil passage 3 collected by the temperature and pressure sensor 2. Based on the cooling oil temperature and pressure of the piston cooling oil passage 3, it controls the piston cooling control valve 4 to control the amount of cooling oil sprayed from the piston cooling nozzle 5.

[0046] Specifically, the electronic control unit 1 controls the piston cooling control valve 4 according to the cooling oil temperature and cooling oil pressure of the piston cooling oil passage 3, thereby controlling the piston cooling nozzle 5 to spray an appropriate amount of lubricating oil at the appropriate time through the piston cooling control valve 4, thereby improving the cooling efficiency of the piston 6.

[0047] In the aforementioned piston cooling control system, a piston cooling control valve 4 is installed on the piston cooling nozzle 5, allowing for individual control of the nozzle 5. The electronic control unit 1 acquires the cooling oil temperature and pressure from the temperature and pressure sensor 2 of the piston cooling oil passage 3. Taking both cooling oil temperature and pressure into account, the piston cooling control valve 4 is controlled to ensure that the piston cooling nozzle 5 injects the appropriate amount of cooling oil at the correct time, improving piston cooling efficiency. This ensures that each piston 6 operates within its optimal temperature range, resulting in more precise control over the amount of cooling oil injected and improved fuel efficiency.

[0048] In one exemplary embodiment, please continue to refer to Figure 1 The piston cooling control system includes multiple pistons 6, each with a corresponding piston cooling nozzle 5 below it, and a corresponding piston cooling control valve 4 at the oil inlet of each piston cooling nozzle 5. The piston cooling control valve 4 controls the amount of cooling oil injected from the corresponding piston cooling nozzle 5. Piston cooling oil passages 3 are connected to the multiple piston cooling control valves 4. The electronic control unit 1 is connected to the multiple piston cooling control valves 4. It should be noted that... Figure 1 This is a schematic diagram of the piston cooling control system for a four-stroke diesel engine, which includes four pistons.

[0049] In this embodiment, a piston cooling control valve 4 is set in front of each piston cooling nozzle 5 to achieve individual control of each piston cooling nozzle 5.

[0050] In one optional embodiment of the above, the electronic control unit 1 is used to control the opening and closing state of the piston cooling control valve 4 according to the cooling oil temperature and cooling oil pressure of the piston cooling oil passage 3, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle 5.

[0051] Optionally, the electronic control unit 1 acquires the cooling oil temperature and pressure of the piston cooling oil passage 3 collected by the temperature and pressure sensor 2. Based on the cooling oil temperature and pressure, it controls the opening and closing state of the piston cooling control valve 4. The opening and closing state can include the opening degree of the piston cooling control valve 4, which includes a fully open state and a fully closed state. The fully open state corresponds to the maximum cooling oil injection volume of the piston cooling nozzle 5, and the fully closed state corresponds to the piston cooling nozzle 5 being closed. The electronic control unit 1 can accurately control the opening and closing state of each piston cooling control valve 4, thereby controlling the cooling oil injection volume of the corresponding piston cooling nozzle 5.

[0052] In the above optional method, the specific process by which the electronic control unit 1 controls the cooling oil injection quantity of the corresponding piston cooling nozzle 5 by controlling the opening and closing state of the piston cooling control valve 4 is as follows:

[0053] The electronic control unit 1 is used to identify whether the cooling oil pressure of the piston cooling oil passage 3 is within the normal pressure range when the engine is running; when the cooling oil pressure of the piston cooling oil passage 3 is within the normal pressure range, it identifies whether the cooling oil temperature of the piston cooling oil passage 3 is lower than the preset temperature; when the cooling oil temperature of the piston cooling oil passage 3 is lower than the preset temperature, it controls the piston cooling control valve 4 to be fully open.

[0054] Optionally, the electronic control unit 1 is used to detect whether the engine is running. When the engine is running, the electronic control unit 1 is used to identify whether the cooling oil pressure in the piston cooling oil passage 3 is within the normal pressure range. The normal pressure range refers to the curve formed by the cooling oil pressure and the engine speed, such as... Figure 2 As shown, this represents the lower limit of normal cooling oil pressure under different engine speeds.

[0055] When the cooling oil pressure in piston cooling oil passage 3 is outside the normal pressure range, the electronic control unit 1 generates a fault code and reports it, limiting engine torque. Engine torque limiting refers to restricting the engine's torque output, thus reducing vehicle power. When the cooling oil pressure in piston cooling oil passage 3 is within the normal pressure range, it can continue to identify whether the cooling oil temperature in piston cooling oil passage 3 is lower than a preset temperature. For example, the preset temperature can be 40℃-60℃. When the cooling oil temperature in piston cooling oil passage 3 is lower than the preset temperature, all piston cooling control valves 4 are controlled to be fully open.

[0056] In the above optional methods, when the engine is running, checking whether the cooling oil pressure of the piston cooling oil passage 3 is within the normal pressure range is to check whether the lubrication system is working properly. Normally, if a malfunction occurs, insufficient cooling oil pressure will appear. If this problem is detected, the piston cannot be cooled properly, requiring timely inspection and repair. When the cooling oil pressure of the piston cooling oil passage 3 is within the normal pressure range, checking whether the cooling oil temperature of the piston cooling oil passage 3 is lower than the preset temperature is also performed. When the cooling oil temperature of the piston cooling oil passage 3 is lower than the preset temperature, controlling the piston cooling control valve 4 to the fully open state is to ensure sufficient lubrication of the piston ring assembly during engine warm-up and to quickly raise the oil temperature for rapid warm-up.

[0057] Furthermore, the electronic control unit 1 is also used to identify whether the engine is in a non-fired operating state when the cooling oil temperature of the piston cooling oil passage 3 is greater than or equal to the preset temperature; when the engine is in a non-fired operating state, it controls the opening and closing state of the piston cooling control valve 4 according to the phase control strategy to control the amount of cooling oil injected by the corresponding piston cooling nozzle 5.

[0058] When the cooling oil temperature in the piston cooling oil passage 3 is greater than or equal to a preset temperature, it is determined whether the engine is in a no-fire operating state. The no-fire operating state includes coasting and auxiliary braking activation. When the engine is in a no-fire operating state, the control strategy for the piston cooling control valve 4 is determined to be a phase control strategy. The opening and closing state of the piston cooling control valve 4 is controlled according to the phase control strategy to control the cooling oil injection quantity of the corresponding piston cooling nozzle 5. The phase control strategy controls the opening and closing state of the piston cooling control valve 4 by controlling the phase angle of the piston cooling control valve 4, i.e., the crankshaft angle phase. The piston compression top dead center refers to the position furthest from the crankshaft rotation center formed by piston compression, which is the highest point reached by the piston during upward compression.

[0059] When the engine is not firing, no fuel is injected into the combustion chamber for combustion, the piston temperature is relatively low, and the demand for cooling oil is small. Furthermore, the high-temperature range mainly comes from the compression stroke. Therefore, the fuel injection of the phase control strategy is mainly concentrated near the top dead center of the piston during compression, and the fuel injection quantity of the cooling nozzle 5 is controlled to be small, which ensures that the piston is sufficiently cooled without overcooling it, thus avoiding a reduction in fuel economy.

[0060] Furthermore, the electronic control unit 1 is also used to control the crankshaft angle and opening degree of the piston cooling control valve 4 according to the phase control strategy, using the piston compression top dead center as the identifier, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle 5; wherein, the crankshaft angle of the piston cooling control valve 4 is less than the first preset angle.

[0061] Specifically, in the phase control strategy, the piston cooling control valve 4 opens near the piston's top dead center during compression, and the crankshaft angle range is relatively small, less than a first preset angle. For example, the first preset angle can be 180 degrees. Taking a four-stroke diesel engine as an example, the crankshaft opens at an angle A before top dead center and closes at an angle B after top dead center, with an opening angle range of A+B degrees, typically less than 180 degrees. Each piston cooling control valve 4 can open and close sequentially. For example, as shown... Figure 3 As shown, this is the opening control curve of the piston cooling control valve 4 corresponding to the phase control strategy. The crankshaft angle at which the piston cooling control valve 4 opens under the phase control strategy, i.e., the crankshaft angle, and the opening size of the piston cooling control valve 4 are executed according to the opening control curve of the piston cooling control valve 4.

[0062] Furthermore, the electronic control unit 1 is also used to control the opening and closing state of the piston cooling control valve 4 according to the fuel injection quantity control strategy when the engine is in the firing state, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle 5.

[0063] When the engine is in ignition mode, i.e., not coasting or with auxiliary braking engaged, the control strategy for the piston cooling control valve 4 is determined to be a fuel injection quantity control strategy. The opening and closing state of the piston cooling control valve 4 is controlled according to the fuel injection quantity control strategy, thereby controlling the amount of cooling oil injected into the corresponding piston cooling nozzle 5. The fuel injection quantity control strategy refers to controlling the opening and closing state of the piston cooling control valve 4 based on the amount of fuel injected into the engine combustion chamber.

[0064] When the engine is in ignition, fuel is injected into the combustion chamber and burned to generate power. The main heat release areas are during the power stroke and exhaust stroke. Therefore, the fuel injection period of the piston cooling nozzle 5 mainly includes these parts. Compared to the phase control strategy, the fuel injection quantity control strategy adjusts the amount of cooling oil injected by the piston cooling nozzle 5 based on the amount of fuel injected.

[0065] Furthermore, the electronic control unit 1 is also used to control the crankshaft angle, opening degree, or injection timing of the piston cooling control valve 4 according to the fuel injection quantity control strategy, so as to control the opening and closing state of the piston cooling control valve 4.

[0066] The fuel injection quantity control strategy adjusts the cooling oil quantity of the piston cooling nozzle 5 based on the fuel injection quantity. In terms of control execution, various methods can be selected, such as increasing the crankshaft angle range of the piston cooling control valve 4, increasing the opening degree of the piston cooling control valve 4, and adjusting the injection timing. Through testing, a control curve for the piston cooling control valve 4 is ultimately formed. The crankshaft angle range is greater than a second preset angle. For example, the second preset angle can be 360 ​​degrees. For instance, the opening period of the piston cooling nozzle 5 can be defined as opening before the piston reaches top dead center during compression and ending at the end of the exhaust stroke, encompassing the entire power stroke and exhaust stroke. The crankshaft angle range is relatively large. Taking a four-stroke diesel engine as an example, the crankshaft opens at a C-degree angle before top dead center during compression and closes at a D-degree angle after top dead center during exhaust, with an opening angle range of C+D degrees, typically greater than 360 degrees. Each piston cooling control valve 4 opens and closes sequentially.

[0067] In the fuel injection quantity control strategy, the crankshaft angle and valve opening size of the piston cooling control valve 4 are related to the fuel injection quantity. The control is executed according to the pre-calibrated piston cooling control valve 4 control curve. The larger the injection quantity, the larger the required cooling oil quantity.

[0068] like Figure 4The figure shows the control curve of piston cooling control valve 4 corresponding to the fuel injection quantity control strategy. Specifically, it is a control curve that adjusts the opening of piston nozzle cooling valve for a fixed injection angle and injection time: the valve is opened at the top dead center of the compression stroke and closed at the top dead center of the exhaust stroke. The opening of piston cooling control valve 4 is adjusted according to the fuel injection quantity.

[0069] In this embodiment, the opening and closing times of the piston cooling nozzle 5 are defined according to the crankshaft rotation phase of the engine, and the crankshaft rotation angle and opening size of the piston cooling valve are defined according to the fuel injection quantity, thereby controlling the fuel injection quantity of the piston cooling nozzle 5. Ultimately, the piston cooling nozzle 5 injects an appropriate amount of cooling oil at the appropriate time, improving piston cooling efficiency, controlling each piston to work within the optimal temperature range, and making the control of piston cooling fuel injection quantity more precise, thus improving fuel saving effect.

[0070] In an exemplary embodiment, the actual amount of cooling oil required for piston cooling is also related to the oil temperature. The temperature and pressure sensor 2 arranged on the piston cooling oil passage 3 in this application can provide the oil temperature of the cooling oil. When the oil temperature is low, the amount of oil injected can be reduced. Introducing the oil temperature parameter can further optimize the control of the amount of cooling oil injected, but it is necessary to increase the relevant basic calibration of the engine under different operating conditions and different ambient temperatures in the early stage.

[0071] Based on the same inventive concept, this application also provides a piston cooling control method for an electronic control unit applied to the piston cooling control system described above. The solution provided by this method is similar to the implementation described in the above system; therefore, the specific limitations in one or more piston cooling control method embodiments provided below can be found in the limitations of the piston cooling control system described above, and will not be repeated here.

[0072] The piston cooling control method provided in this application embodiment can be applied to the electronic control unit 1 in any of the above embodiments. When the engine is running, the electronic control unit 1 acquires the cooling oil pressure and temperature of the piston cooling oil passage 3 collected by the temperature and pressure sensor 2. When it is detected that the cooling oil pressure of the piston cooling oil passage 3 is within the normal pressure range, but the cooling oil temperature of the piston cooling oil passage 3 is greater than or equal to a preset temperature, it identifies whether the engine is in a non-ignition operating state, obtaining an operating state identification result. The operating state identification result includes whether the engine is in a non-ignition operating state or in an ignition operating state. Based on the operating state identification result, a corresponding control strategy is determined, controlling the opening and closing state of the piston cooling control valve 4 to control the cooling oil injection quantity of the corresponding piston cooling nozzle 5; the control strategy is either a phase control strategy or a fuel injection quantity control strategy. When the engine is in a non-ignition operating state, the corresponding control strategy is determined to be a phase control strategy, and the opening and closing state of the piston cooling control valve 4 is controlled according to the phase control strategy to control the cooling oil injection quantity of the corresponding piston cooling nozzle 5. When the engine is in the firing state, the corresponding control strategy is determined to be the fuel injection quantity control strategy. The opening and closing state of the piston cooling control valve 4 is controlled according to the fuel injection quantity control strategy to control the amount of cooling oil injected by the corresponding piston cooling nozzle 5.

[0073] In one exemplary embodiment, such as Figure 5 As shown, a piston cooling control method is provided, including steps 502 to 516. Wherein:

[0074] Step 502: With the engine running, acquire the cooling oil pressure and cooling oil temperature of the piston cooling oil passage collected by the temperature and pressure sensor.

[0075] Step 504: Identify whether the cooling oil pressure in the piston cooling oil passage is within the normal pressure range. If the cooling oil pressure in the piston cooling oil passage is within the normal pressure range, proceed to step 506; if the cooling oil pressure in the piston cooling oil passage is not within the normal pressure range, proceed to step 508.

[0076] Step 506: Identify whether the cooling oil temperature in the piston cooling oil passage is lower than the preset temperature. If the cooling oil temperature in the piston cooling oil passage is lower than the preset temperature, proceed to step 510; if the cooling oil temperature in the piston cooling oil passage is not lower than the preset temperature, proceed to step 512.

[0077] Step 508: Generate and report fault codes, and limit engine torque. End.

[0078] Step 510: Control the piston cooling control valve to the fully open position. End.

[0079] Step 512: Identify whether the engine is in a non-ignition operating state; if the engine is in a non-ignition operating state, proceed to step 514; if the engine is in an ignition operating state, proceed to step 516.

[0080] Step 514: Control the opening and closing state of the piston cooling control valve according to the phase control strategy.

[0081] Step 516: Control the opening and closing state of the piston cooling control valve according to the fuel injection quantity control strategy.

[0082] In an exemplary embodiment, controlling the opening and closing state of the piston cooling control valve according to a phase control strategy includes: controlling the opening crankshaft angle and opening degree of the piston cooling control valve according to the phase control strategy; wherein the opening crankshaft angle of the piston cooling control valve is less than a first preset angle.

[0083] In one exemplary embodiment, controlling the opening and closing state of the piston cooling control valve according to the fuel injection quantity control strategy includes:

[0084] According to the fuel injection quantity control strategy, the crankshaft angle, opening degree, or injection timing of the piston cooling control valve are controlled based on the fuel injection quantity to control the opening and closing state of the piston cooling control valve.

[0085] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0086] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 6As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media. The database stores data such as cooling oil pressure, cooling oil temperature, and control strategies for the piston cooling oil passages. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a piston cooling control method.

[0087] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0088] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0089] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0090] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0091] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0092] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0093] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A piston cooling control system, characterized in that, The piston cooling control system includes: piston; A piston cooling nozzle is disposed below the piston and is used to spray cooling oil onto the piston; A piston cooling control valve is installed on the piston cooling nozzle and is used to control the amount of cooling oil injected into the piston cooling nozzle. A piston cooling oil passage is located below the piston cooling control valve and is connected to the piston cooling control valve; A temperature and pressure sensor is connected to the piston cooling oil passage to collect the cooling oil temperature and pressure of the piston cooling oil passage. An electronic control unit, connected to the piston cooling control valve and the temperature and pressure sensor, is used to acquire the cooling oil temperature and cooling oil pressure of the piston cooling oil passage collected by the temperature and pressure sensor, and to control the piston cooling control valve according to the cooling oil temperature and cooling oil pressure of the piston cooling oil passage, so as to control the amount of cooling oil injected by the piston cooling nozzle. The electronic control unit is also used to, when the engine is running, identify whether the cooling oil pressure of the piston cooling oil passage is within the normal pressure range; when the cooling oil pressure of the piston cooling oil passage is within the normal pressure range, identify whether the cooling oil temperature of the piston cooling oil passage is lower than a preset temperature; when the cooling oil temperature of the piston cooling oil passage is lower than the preset temperature, control the piston cooling control valve to the fully open state; when the cooling oil temperature of the piston cooling oil passage is not lower than the preset temperature, identify whether the engine is in a non-firing operating state; when the engine is in a non-firing operating state, control the opening and closing state of the piston cooling control valve according to the phase control strategy to control the cooling oil injection quantity of the corresponding piston cooling nozzle; wherein, when the engine is in a non-firing operating state, no fuel is injected and burned in the engine combustion chamber, the piston temperature is relatively low, the demand for cooling oil is small, and the high temperature range mainly comes from the compression stroke, the fuel injection of the phase control strategy is mainly concentrated near the top dead center of the piston compression.

2. The piston cooling control system according to claim 1, characterized in that, The piston cooling control system includes multiple pistons, with a piston cooling nozzle corresponding to the bottom of each piston, and a piston cooling control valve corresponding to the oil inlet of each piston cooling nozzle; the piston cooling control valve is used to control the amount of cooling oil injected into the corresponding piston cooling nozzle.

3. The piston cooling control system according to claim 1, characterized in that, The electronic control unit is also used to control the crankshaft angle and opening degree of the piston cooling control valve according to the phase control strategy, so as to control the amount of cooling oil injected by the corresponding piston cooling nozzle; wherein, the crankshaft angle of the piston cooling control valve is less than a first preset angle.

4. The piston cooling control system according to claim 1, characterized in that, The electronic control unit is also used to control the opening and closing state of the piston cooling control valve according to the fuel injection quantity control strategy when the engine is in the firing state, so as to control the amount of cooling oil injected into the corresponding piston cooling nozzle.

5. The piston cooling control system according to claim 4, characterized in that, The electronic control unit is also used to control the crankshaft angle, opening degree, or injection timing of the piston cooling control valve according to the fuel injection quantity control strategy, so as to control the opening and closing state of the piston cooling control valve.

6. A piston cooling control method, characterized in that, The method, which applies to the electronic control unit in the piston cooling control system according to any one of claims 1 to 5, comprises: With the engine running, the cooling oil pressure and cooling oil temperature of the piston cooling oil passage are acquired by the temperature and pressure sensor. When it is detected that the cooling oil pressure in the piston cooling oil passage is within the normal pressure range, but the cooling oil temperature in the piston cooling oil passage is greater than or equal to the preset temperature, it is determined whether the engine is in a non-firing working state, and the working state identification result is obtained. Based on the working state identification result, a corresponding control strategy is determined to control the opening and closing state of the piston cooling control valve, so as to control the amount of cooling oil injected into the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection quantity control strategy. The method further includes: When the temperature of the cooling oil in the piston cooling oil passage is lower than the preset temperature, the piston cooling control valve is controlled to be fully open. When the operating state identification result is a non-ignition operating state, the corresponding control strategy is determined to be a phase control strategy. The opening and closing state of the piston cooling control valve is controlled according to the phase control strategy to control the amount of cooling oil injected by the corresponding piston cooling nozzle. When the engine is in a non-ignition operating state, no fuel is injected into the engine combustion chamber for combustion, the piston temperature is relatively low, the demand for cooling oil is small, and the high temperature range mainly comes from the compression stroke. The oil injection of the phase control strategy is mainly concentrated near the top dead center of the piston compression.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method of claim 6.

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