Piston cooling control system, method and computer equipment

Abstract

The invention relates to a piston cooling control system and method and computer equipment. The system includes: a piston; the piston cooling nozzle is arranged below the piston and is used for spraying cooling oil to the piston; the piston cooling control valve is arranged on the piston cooling nozzle and used for controlling the cooling oil injection amount of the piston cooling nozzle; the piston cooling oil duct is arranged below the piston cooling control valve and is communicated with the piston cooling control valve; the temperature and pressure sensor is connected with the piston cooling oil duct and used for collecting the cooling oil temperature and the cooling oil pressure of the piston cooling oil duct; the electronic control unit is connected with the piston cooling control valve and the temperature and pressure sensor and used for controlling the piston cooling control valve according to the cooling oil temperature and the cooling oil pressure of the piston cooling oil channel so as to control the cooling oil injection amount of the piston cooling nozzle. By means of the method, the cooling oil injection amount of the piston can be finely controlled, and the oil saving effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of piston cooling control, and in particular to a piston cooling control system, method and computer equipment. Background Art

[0002] The piston is one of the key parts of the engine. During the operation of the engine, the piston is subjected to high temperature and high pressure loads. The heat dissipation and cooling of the piston is very important for the design and development of the engine. If the cooling is insufficient, it will cause the piston to deform, carbon deposit, and even cause cylinder scuffing. If the cooling is excessive, it will cause heat loss in the engine, high power consumption of the oil pump, and low fuel economy of the engine.

[0003] In conventional technologies, all piston cooling nozzles are mostly controlled by one control valve, which results in insufficient precision of control and poor fuel saving effect. Summary of the invention

[0004] Based on this, it is necessary to provide a piston cooling control system, method and computer equipment that can finely control the cooling oil injection amount of the piston and improve the fuel saving effect in response to the above technical problems.

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

[0006] piston;

[0007] A piston cooling nozzle, disposed below the piston, for spraying cooling oil onto the piston;

[0008] A piston cooling control valve, disposed on the piston cooling nozzle, for controlling the amount of cooling oil sprayed from the piston cooling nozzle;

[0009] A piston cooling oil passage is provided below the piston cooling control valve and is in communication with the piston cooling control valve;

[0010] A temperature and pressure sensor connected to the piston cooling oil passage, and used to collect the cooling oil temperature and cooling oil pressure of the piston cooling oil passage;

[0011] An electronic control unit is connected to the piston cooling control valve and the temperature and pressure sensor, and is used to obtain the cooling oil temperature and cooling oil pressure of the piston cooling oil channel collected by the temperature and pressure sensor, and control the piston cooling control valve according to the cooling oil temperature and cooling oil pressure of the piston cooling oil channel to control the cooling oil injection amount of the piston cooling nozzle.

[0012] In one embodiment, the piston cooling control system includes multiple pistons, a piston cooling nozzle is correspondingly arranged under each piston, and a piston cooling control valve is correspondingly arranged at the oil inlet of each piston cooling nozzle; the piston cooling control valve is used to control the cooling oil injection amount of the corresponding piston cooling nozzle.

[0013] In one of the embodiments, 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 channel to control the cooling oil injection amount of 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 channel is within a normal pressure range when the engine is started; when the cooling oil pressure of the piston cooling oil channel is within the normal pressure range, identify whether the cooling oil temperature of the piston cooling oil channel is lower than a preset temperature; when the cooling oil temperature of the piston cooling oil channel is lower than a preset temperature, control the piston cooling control valve to a fully open state.

[0015] In one of the embodiments, the electronic control unit is also used to identify whether the engine is in a misfire working state when the cooling oil temperature of the piston cooling oil channel is not less than a preset temperature; when the engine is in a misfire working state, the opening and closing state of the piston cooling control valve is controlled according to the phase control strategy to control the cooling oil injection amount of the corresponding piston cooling nozzle.

[0016] In one of the embodiments, the electronic control unit is also used to control the opening crankshaft angle and opening degree of the piston cooling control valve according to a phase control strategy to control the cooling oil injection amount of the corresponding piston cooling nozzle; wherein, the opening crankshaft angle of the piston cooling control valve is less than a first preset angle.

[0017] In one of the embodiments, 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 ignition working state, so as to control the cooling oil injection quantity of the corresponding piston cooling nozzle.

[0018] In one of the embodiments, the electronic control unit is also used to control the opening crankshaft angle, opening degree or injection timing of the piston cooling control valve according to the fuel injection amount in accordance with the fuel injection amount control strategy, so as to control the opening and closing state of the piston cooling control valve.

[0019] In a second aspect, the present application further provides a piston cooling control method, which is applied to an electronic control unit in the piston cooling control system described in the first aspect, and the method comprises:

[0020] When the engine is started, obtaining the cooling oil pressure and cooling oil temperature of the piston cooling oil passage collected by the temperature and pressure sensor;

[0021] When it is identified that the cooling oil pressure of the piston cooling oil passage is within a normal pressure range, but the cooling oil temperature of the piston cooling oil passage is greater than or equal to a preset temperature, identifying whether the engine is in a misfire working state, and obtaining a working state identification result;

[0022] A corresponding control strategy is determined according to the working state identification result to control the opening and closing state of the piston cooling control valve to control the cooling oil injection amount of the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection amount control strategy.

[0023] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0024] When the engine is started, obtaining the cooling oil pressure and cooling oil temperature of the piston cooling oil passage collected by the temperature and pressure sensor;

[0025] When it is identified that the cooling oil pressure of the piston cooling oil passage is within a normal pressure range, but the cooling oil temperature of the piston cooling oil passage is greater than or equal to a preset temperature, identifying whether the engine is in a misfire working state, and obtaining a working state identification result;

[0026] A corresponding control strategy is determined according to the working state identification result to control the opening and closing state of the piston cooling control valve to control the cooling oil injection amount of the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection amount control strategy.

[0027] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0028] When the engine is started, obtaining the cooling oil pressure and cooling oil temperature of the piston cooling oil passage collected by the temperature and pressure sensor;

[0029] When it is identified that the cooling oil pressure of the piston cooling oil passage is within a normal pressure range, but the cooling oil temperature of the piston cooling oil passage is greater than or equal to a preset temperature, identifying whether the engine is in a misfire working state, and obtaining a working state identification result;

[0030] A corresponding control strategy is determined according to the working state identification result to control the opening and closing state of the piston cooling control valve to control the cooling oil injection amount of the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection amount control strategy.

[0031] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0032] When the engine is started, obtaining the cooling oil pressure and cooling oil temperature of the piston cooling oil passage collected by the temperature and pressure sensor;

[0033] When it is identified that the cooling oil pressure of the piston cooling oil passage is within a normal pressure range, but the cooling oil temperature of the piston cooling oil passage is greater than or equal to a preset temperature, identifying whether the engine is in a misfire working state, and obtaining a working state identification result;

[0034] A corresponding control strategy is determined according to the working state identification result to control the opening and closing state of the piston cooling control valve to control the cooling oil injection amount of the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection amount control strategy.

[0035] The piston cooling control system, method, computer device, storage medium and computer program product can individually control the piston cooling nozzle by setting a piston cooling control valve on the piston cooling nozzle. The cooling oil temperature and cooling oil pressure of the piston cooling oil channel collected by the temperature and pressure sensor are obtained by the electronic control unit, and the piston cooling control valve is controlled by considering the cooling oil temperature and cooling oil pressure at the same time, so as to control the piston cooling nozzle to spray an appropriate amount of cooling oil at the right time, improve the piston cooling efficiency, control each piston to work within the optimal temperature range, and control the piston cooling oil injection amount more precisely, thereby improving the fuel saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] FIG1 is a schematic structural diagram of a piston cooling control system in one embodiment;

[0038] FIG2 is a schematic diagram of a normal pressure range curve in one embodiment;

[0039] FIG3 is a schematic diagram of a piston cooling control valve opening control curve corresponding to a phase control strategy in one embodiment;

[0040] FIG4 is a schematic diagram of a piston cooling control valve control curve corresponding to a fuel injection quantity control strategy in one embodiment;

[0041] FIG5 is a schematic flow chart of a piston cooling control method in one embodiment;

[0042] FIG. 6 is a diagram showing the internal structure of a computer device in one embodiment.

[0043] Explanation of the accompanying drawings: 1. Electronic control unit; 2. Temperature and pressure sensor; 3. Piston cooling oil channel; 4. Piston cooling control valve; 5. Piston cooling nozzle; 6. Piston. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] The piston cooling control system provided in the embodiment of the present application, please refer to FIG1, the piston cooling control system includes an electronic control unit (Electronic Control Unit, ECU) 1, a temperature and pressure sensor 2, a piston cooling oil channel 3, a piston cooling control valve 4, a piston cooling nozzle 5 and a piston 6, wherein: the piston cooling nozzle 5 is arranged below the piston 6 and is used to spray cooling oil to the piston 6. The piston cooling control valve 4 is arranged on the piston cooling nozzle 5 and is used to control the cooling oil spray amount of the piston cooling nozzle 5. The piston cooling oil channel 3 is arranged below the piston cooling control valve 4 and is connected to the piston cooling control valve 4. The piston cooling oil channel 3 is used to provide cooling oil to the piston cooling nozzle 5. The temperature and pressure sensor 2 is connected to the piston cooling oil channel 3 and is used to collect the cooling oil temperature and cooling oil pressure of the piston cooling oil channel 3. The electronic control unit 1 is connected to the piston cooling control valve 4 and the temperature and pressure sensor 2, and is used to obtain the cooling oil temperature and cooling oil pressure of the piston cooling oil channel 3 collected by the temperature and pressure sensor 2, and control the piston cooling control valve 4 according to the cooling oil temperature and cooling oil pressure of the piston cooling oil channel 3 to control the cooling oil injection amount of the piston cooling nozzle 5.

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

[0047] In the above piston cooling control system, by arranging the piston cooling control valve 4 on the piston cooling nozzle 5, the piston cooling nozzle 5 can be individually controlled. The cooling oil temperature and cooling oil pressure of the piston cooling oil passage 3 collected by the temperature and pressure sensor 2 are obtained by the electronic control unit 1, and the piston cooling control valve 4 is controlled by considering the cooling oil temperature and cooling oil pressure at the same time, so as to control the piston cooling nozzle 5 to spray an appropriate amount of cooling oil at the right time, improve the piston cooling efficiency, control each piston 6 to work within the optimal temperature range, and control the piston cooling oil injection amount more precisely, thereby improving the fuel saving effect.

[0048] In an exemplary embodiment, please continue to refer to Figure 1, the piston cooling control system includes a plurality of pistons 6, a piston cooling nozzle 5 is correspondingly arranged below each piston 6, and a piston cooling control valve 4 is correspondingly arranged at the oil inlet of each piston cooling nozzle 5; the piston cooling control valve 4 is used to control the cooling oil injection amount of the corresponding piston cooling nozzle 5. The piston cooling oil channel 3 is connected to the plurality of piston cooling control valves 4. The electronic control unit 1 is connected to the plurality of piston cooling control valves 4. It should be noted that Figure 1 is a schematic diagram of a piston cooling control system of a four-stroke diesel engine, including four pistons.

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

[0050] In an optional manner of the above embodiment, 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 channel 3 to control the cooling oil injection amount of the corresponding piston cooling nozzle 5.

[0051] Optionally, the electronic control unit 1 obtains the cooling oil temperature and cooling oil pressure of the piston cooling oil passage 3 collected by the temperature and pressure sensor 2, and controls the opening and closing state of the piston cooling control valve 4 according to the cooling oil temperature and cooling oil pressure. The opening and closing state may include the opening degree of the piston cooling control valve 4, and the opening degree includes a fully open state and a fully closed state. The fully open state corresponds to the maximum cooling oil injection amount of the piston cooling nozzle 5, and the fully closed state corresponds to closing the piston cooling nozzle 5. 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 amount of the corresponding piston cooling nozzle 5.

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

[0053] The electronic control unit 1 is used to identify whether the cooling oil pressure of the piston cooling oil channel 3 is within the normal pressure range when the engine is started; when the cooling oil pressure of the piston cooling oil channel 3 is within the normal pressure range, identify whether the cooling oil temperature of the piston cooling oil channel 3 is lower than a preset temperature; when the cooling oil temperature of the piston cooling oil channel 3 is lower than the preset temperature, control the piston cooling control valve 4 to a fully open state.

[0054] Optionally, the electronic control unit 1 is used to detect whether the engine is in the on state. When the engine is in the starting state, 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. The normal pressure range refers to a curve formed by the cooling oil pressure and the engine speed, as shown in FIG. 2, indicating the lower limit value of the normal cooling oil pressure under different engine speed conditions.

[0055] When the cooling oil pressure of the piston cooling oil channel 3 is not within the normal pressure range, the electronic control unit 1 is used to generate a fault code and report it, and limit the engine torque. Among them, engine torque limitation refers to limiting the torque output of the engine and reducing the power of the vehicle. When the cooling oil pressure of the piston cooling oil channel 3 is within the normal pressure range, it is possible to continue to identify whether the cooling oil temperature of the piston cooling oil channel 3 is less than the preset temperature. For example, the preset temperature can be 40℃-60℃. When the cooling oil temperature of the piston cooling oil channel 3 is less than the preset temperature, all piston cooling control valves 4 are controlled to be fully open.

[0056] In the above optional method, when the engine is started, it is determined whether the cooling oil pressure of the piston cooling oil passage 3 is within the normal pressure range in order to check whether the lubrication system is working properly. Normally, if there is a fault, insufficient cooling oil pressure will occur. If this problem is detected, the piston cannot be cooled normally, and timely inspection and maintenance are required. When the cooling oil pressure of the piston cooling oil passage 3 is within the normal pressure range, it is determined whether the cooling oil temperature of the piston cooling oil passage 3 is less than the preset temperature. When the cooling oil temperature of the piston cooling oil passage 3 is less than the preset temperature, the piston cooling control valve 4 is controlled to be fully open in order to ensure that there is sufficient lubricating oil to ensure the lubrication of the piston ring group during the engine warm-up process, and to quickly increase the oil temperature and warm up the engine quickly.

[0057] Furthermore, the electronic control unit 1 is also used to identify whether the engine is in a misfire working state when the cooling oil temperature of the piston cooling oil channel 3 is greater than or equal to a preset temperature; when the engine is in a misfire working state, 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 amount of the corresponding piston cooling nozzle 5.

[0058] When the cooling oil temperature of the piston cooling oil channel 3 is greater than or equal to the preset temperature, it is identified whether the engine is in a misfire working state. The misfire working state includes the coasting and auxiliary brake on states. When the engine is in a misfire working state, the control strategy of 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 amount of the corresponding piston cooling nozzle 5. The phase control strategy is to control the opening and closing state of the piston cooling control valve 4 by controlling the phase angle of the piston cooling control valve 4, that is, opening the crankshaft angle phase. Among them, the piston compression top dead center refers to the position farthest from the crankshaft rotation center formed by the piston compression, that is, the highest point reached by the piston compression upward.

[0059] When the engine is in a non-firing working state, no fuel is sprayed in the engine combustion chamber for combustion, the piston temperature is relatively low, the demand for cooling oil is small, and the high temperature section mainly comes from the compression stroke. Therefore, the injection of the phase control strategy is mainly concentrated near the top dead center of the piston compression, and the injection amount of the cooling nozzle 5 is controlled to be small, which ensures that the piston is fully cooled without overcooling the piston to avoid reducing fuel economy.

[0060] Furthermore, the electronic control unit 1 is also used to control the opening crankshaft angle and opening degree of the piston cooling control valve 4 according to the phase control strategy, with the piston compression top dead center as the identification position, so as to control the cooling oil injection amount of the corresponding piston cooling nozzle 5; wherein, the opening 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 is opened near the piston compression top dead center, and the crankshaft angle range is relatively small, less than the first preset angle. For example, the first preset angle can be 180 degrees. Taking a four-stroke diesel engine as an example, it is opened at a crankshaft angle of A degrees before the compression top dead center and closed at a crankshaft angle of B degrees after the compression top dead center. The opening angle range is A+B degrees, which is usually less than 180 degrees. Each piston cooling control valve 4 can be opened and closed in sequence. Exemplarily, as shown in FIG3, it is the piston cooling control valve 4 opening control curve corresponding to the phase control strategy. The piston cooling control valve 4 opening crankshaft angle of the phase control strategy, that is, the crankshaft angle and the opening size of the piston cooling control valve 4 are executed according to the piston cooling control valve 4 opening control curve.

[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 ignition working state, so as to control the cooling oil injection quantity of the corresponding piston cooling nozzle 5.

[0063] When the engine is in the ignition working state, that is, in the non-slip and auxiliary brake on state, the control strategy of the piston cooling control valve 4 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 cooling oil injection quantity of 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 fuel injection quantity in the engine combustion chamber.

[0064] When the engine is in the ignition working state, the fuel injected into the engine combustion chamber is burned to do work, and the main heat release area is in the power stroke and exhaust stroke, so the injection period of the piston cooling nozzle 5 is also mainly included in this part. Compared with the phase control strategy, the fuel injection amount control strategy adjusts the cooling oil injection amount of the piston cooling nozzle 5 based on the fuel injection amount.

[0065] Furthermore, the electronic control unit 1 is also used to control the opening crankshaft angle, opening degree or injection timing of the piston cooling control valve 4 according to the fuel injection amount 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, multiple methods 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, adjusting the injection time, etc. can be selected. Through experimental testing, the control curve of the piston cooling control valve 4 is finally formed. The crankshaft angle range is greater than the second preset angle. For example, the second preset angle can be 360 ​​degrees. For example, the opening period of the piston cooling nozzle 5 can be defined to be opened before the piston compression top dead center, at the end of the exhaust stroke, including the entire power stroke and the exhaust stroke, and the crankshaft angle range is relatively large. Taking a four-stroke diesel engine as an example, it is opened at a crankshaft angle of C degrees before the compression top dead center and closed at a crankshaft angle of D degrees after the exhaust top dead center. The opening angle range is C+D degrees, and the opening angle range is usually greater than 360 degrees. Each piston cooling control valve 4 is opened and closed in sequence.

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

[0068] As shown in Figure 4, this is the control curve of the piston cooling control valve 4 corresponding to the fuel injection amount control strategy, specifically, a control curve for adjusting the opening of the piston nozzle cooling valve by giving a fixed injection angle and injection time: opening at the fixed compression stroke top dead point and closing at the exhaust stroke top dead point, and adjusting the opening of the piston cooling control valve 4 according to the fuel injection amount.

[0069] In this embodiment, the opening and closing time of the piston cooling nozzle 5 is defined according to the crankshaft angle phase of the engine, and the crankshaft angle and opening size of the piston cooling valve are defined according to the fuel injection amount, so as to control the injection amount of the piston cooling nozzle 5, and finally the piston cooling nozzle 5 can spray the right amount of cooling oil at the right time, improve the piston cooling efficiency, control each piston to work within the optimal temperature range, and control the piston cooling injection amount more precisely, thereby improving the 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 of the cooling oil. The temperature and pressure sensor 2 arranged on the piston cooling oil channel 3 in the present application can provide the oil temperature of the cooling oil. When the oil temperature is low, the injection amount can be reduced. The introduction of the oil temperature parameter can further optimize the control of the cooling oil injection amount, but it is necessary to increase the relevant basic calibration for different engine operating conditions and different ambient temperatures in the early stage.

[0071] Based on the same inventive concept, the embodiment of the present application also provides a piston cooling control method for an electronic control unit in the piston cooling control system involved above. The implementation scheme for solving the problem provided by the method is similar to the implementation scheme recorded in the above system, so the specific definitions in one or more piston cooling control method embodiments provided below can refer to the above definitions of the piston cooling control system, and will not be repeated here.

[0072] The piston cooling control method provided in the embodiment of the present application can be applied to the electronic control unit 1 in any of the above embodiments. When the engine is started, the electronic control unit 1 obtains the cooling oil pressure and cooling oil temperature of the piston cooling oil channel 3 collected by the temperature and pressure sensor 2. When it is identified that the cooling oil pressure of the piston cooling oil channel 3 is within the normal pressure range, but the cooling oil temperature of the piston cooling oil channel 3 is greater than or equal to the preset temperature, it is identified whether the engine is in a misfire working state, and a working state identification result is obtained. Among them, the working state identification result includes the engine being in a misfire working state and the engine being in a ignition working state. According to the working state identification result, the corresponding control strategy is determined to control the opening and closing state of the piston cooling control valve 4 to control the cooling oil injection amount of the corresponding piston cooling nozzle 5; the control strategy is a phase control strategy or a fuel injection amount control strategy. When the engine is in a misfire working 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 amount of the corresponding piston cooling nozzle 5. When the engine is in the ignition working state, the corresponding control strategy is determined to be the fuel injection quantity control strategy, and 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 cooling oil injection quantity of the corresponding piston cooling nozzle 5.

[0073] In an exemplary embodiment, as shown in FIG5 , a piston cooling control method is provided, comprising the following steps 502 to 516 . Among them:

[0074] Step 502: When the engine is started, the cooling oil pressure and cooling oil temperature of the piston cooling oil passage collected by the temperature and pressure sensor are obtained.

[0075] Step 504, identifying 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, step 506 is executed; when the cooling oil pressure of the piston cooling oil passage is not within the normal pressure range, step 508 is executed.

[0076] Step 506, identifying whether the cooling oil temperature of the piston cooling oil passage is less than a preset temperature. When the cooling oil temperature of the piston cooling oil passage is less than the preset temperature, step 510 is executed; when the cooling oil temperature of the piston cooling oil passage is not less than the preset temperature, step 512 is executed.

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

[0078] Step 510, control the piston cooling control valve to a fully open state. End.

[0079] Step 512, identifying whether the engine is in a misfire working state; when the engine is in a misfire working state, executing step 514; when the engine is in a ignition working state, executing 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, controlling the opening and closing state of the piston cooling control valve according to the fuel injection amount control strategy.

[0082] In an exemplary embodiment, the opening and closing state of the piston cooling control valve is controlled according to a phase control strategy, including: 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 an 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 opening crankshaft angle, opening degree or injection timing of the piston cooling control valve is controlled according to 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 above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed 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 part of the steps or stages in other steps.

[0086] In an exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in FIG6. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as the cooling oil pressure, cooling oil temperature, and control strategy of the piston cooling oil channel. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a piston cooling control method is implemented.

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

[0088] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[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, which implements the steps in the above method embodiments when executed by a processor.

[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, stored data, displayed data, 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 relevant data must comply with relevant regulations.

[0092] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and 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 embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0093] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A piston cooling control system, characterized in that: The piston cooling control system comprises: 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 is provided below the piston cooling control valve and is in communication with the piston cooling control valve; A temperature and pressure sensor connected to the piston cooling oil passage, and used to collect the cooling oil temperature and cooling oil pressure of the piston cooling oil passage; An electronic control unit is connected to the piston cooling control valve and the temperature and pressure sensor, and is used to obtain the cooling oil temperature and cooling oil pressure of the piston cooling oil channel collected by the temperature and pressure sensor, and control the piston cooling control valve according to the cooling oil temperature and cooling oil pressure of the piston cooling oil channel to control the cooling oil injection amount of the piston cooling nozzle.

2. The piston cooling control system according to claim 1, characterized in that: The piston cooling control system includes a plurality of pistons, a piston cooling nozzle is correspondingly arranged under each piston, and a piston cooling control valve is correspondingly arranged at the oil inlet of each piston cooling nozzle; the piston cooling control valve is used to control the cooling oil injection amount of the corresponding piston cooling nozzle.

3. The piston cooling control system according to claim 2, characterized in that: 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 channel to control the cooling oil injection amount of the corresponding piston cooling nozzle.

4. The piston cooling control system according to claim 3, characterized in that: The electronic control unit is used to identify whether the cooling oil pressure of the piston cooling oil channel is within a normal pressure range when the engine is started; when the cooling oil pressure of the piston cooling oil channel is within the normal pressure range, identify whether the cooling oil temperature of the piston cooling oil channel is less than a preset temperature; when the cooling oil temperature of the piston cooling oil channel is less than the preset temperature, control the piston cooling control valve to a fully open state.

5. The piston cooling control system according to claim 4, characterized in that: The electronic control unit is also used to identify whether the engine is in a misfire working state when the cooling oil temperature of the piston cooling oil channel is not less than a preset temperature; when the engine is in a misfire working state, the opening and closing state of the piston cooling control valve is controlled according to the phase control strategy to control the cooling oil injection amount of the corresponding piston cooling nozzle.

6. The piston cooling control system according to claim 5, characterized in that: The electronic control unit is also used to control the opening crankshaft angle and opening degree of the piston cooling control valve according to the phase control strategy to control the cooling oil injection amount of the corresponding piston cooling nozzle; wherein the opening crankshaft angle of the piston cooling control valve is less than a first preset angle.

7. The piston cooling control system according to claim 5, 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 amount control strategy when the engine is in the ignition working state, so as to control the cooling oil injection amount of the corresponding piston cooling nozzle.

8. The piston cooling control system according to claim 7, characterized in that: The electronic control unit is also used to control the opening crankshaft angle, opening degree or injection timing of the piston cooling control valve according to the fuel injection amount control strategy, so as to control the opening and closing state of the piston cooling control valve.

9. A piston cooling control method, characterized in that: An electronic control unit applied to a piston cooling control system according to any one of claims 1 to 8, the method comprising: When the engine is started, obtaining the cooling oil pressure and cooling oil temperature of the piston cooling oil passage collected by the temperature and pressure sensor; When it is identified that the cooling oil pressure of the piston cooling oil passage is within a normal pressure range, but the cooling oil temperature of the piston cooling oil passage is greater than or equal to a preset temperature, identifying whether the engine is in a misfire working state, and obtaining a working state identification result; A corresponding control strategy is determined according to the working state identification result to control the opening and closing state of the piston cooling control valve to control the cooling oil injection amount of the corresponding piston cooling nozzle; the control strategy is a phase control strategy or a fuel injection amount control strategy.

10. 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, the steps of the method according to claim 9 are implemented.

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