Engine oil emulsification inhibition method for extended-range vehicle and related product

Abstract

The invention discloses an engine oil emulsification inhibition method for an extended-range vehicle and a related product, relates to the technical field of engines, and realizes effective control of an engine oil emulsification risk. A branch pipeline of a driving motor cooling liquid circulation loop is integrated in a crankcase oil pan of the range extending type vehicle, and an electronic valve is arranged on the branch pipeline. When the electronic valve is opened, the branch pipeline is used for guiding part of the cooling liquid after heat exchange of the driving motor into the oil pan, so that the cooling liquid exchanges heat with engine oil in the oil pan, and the cooling liquid after heat exchange is converged into the driving motor cooling liquid circulation loop; the method comprises the steps that the temperature of engine oil in an oil pan and the temperature of cooling liquid in a branch pipeline are obtained; when it is detected that the temperature of engine oil in the oil pan is lower than the temperature of cooling liquid in the branch pipeline, the electronic valve is controlled to be opened; and when it is detected that the temperature of engine oil in the oil pan is not lower than the temperature of cooling liquid in the branch pipeline, the electronic valve is controlled to be closed.

Description

Technical Field

[0001] This application relates to the technical field of engines, and particularly to a method for suppressing engine oil emulsification in a range-extended vehicle and related products. Background Art

[0002] A range-extended vehicle is a hybrid electric vehicle dominated by electric drive, and its power system consists of a power battery pack, a drive motor, and a range extender (an integrated device of an engine and a generator). Its working principle is as follows: when the battery of the vehicle is fully charged, the power battery directly supplies power to the drive motor to drive the wheels (pure electric mode); when the battery power drops to a threshold value, the range extender starts, and the engine burns fuel to drive the generator to generate electricity. The generated electricity is preferentially directly supplied to the drive motor, and the surplus energy is used to charge the power battery.

[0003] The crankcase is one of the important components of the engine, mainly playing the role of accommodating and protecting the crankshaft and its related components. An oil pan is provided at the bottom of the crankcase for storing engine oil. When the engine is running, the oil pump pumps out the engine oil in the oil pan and outputs it to each lubrication point of the engine. The lubricated engine oil flows back to the oil pan to form a cycle; at the same time, the water vapor generated by the fuel combustion in the engine cylinder will enter the crankcase through the piston ring gap.

[0004] However, under conditions such as long-term engine shutdown or frequent engine start-stop, the engine is difficult to continuously maintain a hot engine state, resulting in the engine oil temperature remaining at a relatively low level for a long time. This low-temperature environment will inhibit the evaporation of water vapor in the crankcase and cause it to condense into liquid water. As the engine shutdown time extends or the number of engine start-stop cycles increases, the liquid water accumulates continuously in the crankcase, and the proportion of water content in the engine oil gradually increases. When the proportion of water content exceeds the critical value, under the mechanical stirring action during engine operation, the water and hydrocarbon substances in the engine oil will undergo an emulsification reaction (that is, in a low-temperature environment, the activity of engine oil additives decreases, and they cannot effectively wrap the water, and water and oil form a stable emulsion under mechanical force). The emulsification reaction will change the viscosity characteristics of the engine oil, resulting in a decrease in its fluidity, a reduction in lubrication efficiency, and a weakening of antioxidant performance, ultimately causing a significant deterioration in the performance of the engine oil and seriously affecting the stable operation and service life of the engine. Summary of the Invention

[0005] In view of the above problems, this application provides a method for suppressing engine oil emulsification in a range-extended vehicle and related products to effectively control the risk of engine oil emulsification. The specific solutions are as follows:

[0006] The first aspect of the present application provides an oil emulsification inhibition method for a range-extended vehicle. A branch pipeline of a driving motor coolant circulation loop is integrated inside the crankcase oil pan of the range-extended vehicle, and an electronic valve is provided on the branch pipeline. When the electronic valve is opened, the branch pipeline is used to guide a part of the coolant after heat exchange of the driving motor to the oil pan, so that it exchanges heat with the engine oil in the oil pan, and the coolant after heat exchange is then merged into the driving motor coolant circulation loop. The method includes:

[0007] Obtain the engine oil temperature in the oil pan and the coolant temperature in the branch pipeline;

[0008] When it is detected that the engine oil temperature in the oil pan is lower than the coolant temperature in the branch pipeline, control the electronic valve to open; when it is detected that the engine oil temperature in the oil pan is not lower than the coolant temperature in the branch pipeline, control the electronic valve to close.

[0009] In a possible implementation, the step of when it is detected that the engine oil temperature in the oil pan is lower than the coolant temperature in the branch pipeline, control the electronic valve to open; when it is detected that the engine oil temperature in the oil pan is not lower than the coolant temperature in the branch pipeline, control the electronic valve to close, is replaced by:

[0010] When it is detected that the engine oil temperature in the oil pan is lower than the difference between the coolant temperature in the branch pipeline and a first preset value, control the electronic valve to open; when it is detected that the engine oil temperature in the oil pan is not lower than the sum of the coolant temperature in the branch pipeline and a second preset value, control the electronic valve to close; both the first preset value and the second preset value are greater than zero.

[0011] In a possible implementation, the engine of the range-extended vehicle is a gas engine;

[0012] The method further includes: when receiving an engine shutdown instruction, cut off the gas supply of the gas injection system to the engine, and control the driving motor to reversely drag the engine, so that the engine runs continuously at a preset speed for a first preset time, and then control the driving motor to stop reversely dragging the engine.

[0013] In a possible implementation, the preset speed is lower than the vehicle idle speed.

[0014] In a possible implementation, the preset speed and the first preset time are dynamically adjusted according to the engine oil temperature in the oil pan.

[0015] In a possible implementation, the engine of the range-extended vehicle is a gas engine; the crankcase is configured with a moisture discharge pipeline, one end of the moisture discharge pipeline communicates with the inside of the crankcase, and the other end communicates with the tail gas exhaust pipe; and an electric breather is provided on the moisture discharge pipeline.

[0016] The method further includes: when the engine is running, controlling the electric breather to be in an operating state; when an engine shutdown instruction is received, controlling the electric breather to continue running for a second preset time, and then controlling the electric breather to stop running.

[0017] In a possible implementation, the second preset time is dynamically adjusted according to the ambient humidity parameter in the crankcase.

[0018] A second aspect of the present application provides a computer program product, including computer-readable instructions, which when running on a vehicle electronic control unit, enable the vehicle electronic control unit to implement the method for suppressing oil emulsification of the range-extended vehicle according to the first aspect or any implementation manner of the first aspect.

[0019] A third aspect of the present application provides a vehicle electronic control unit, including at least one processor and a memory connected to the processor, wherein:

[0020] The memory is used to store a computer program;

[0021] The processor is used to execute the computer program so that the vehicle electronic control unit can implement the method for suppressing oil emulsification of the range-extended vehicle according to the first aspect or any implementation manner of the first aspect.

[0022] A fourth aspect of the present application provides a computer storage medium, the storage medium carrying one or more computer programs, which when executed by a vehicle electronic control unit, can enable the vehicle electronic control unit to implement the method for suppressing oil emulsification of the range-extended vehicle according to the first aspect or any implementation manner of the first aspect.

[0023] By means of the above technical solution, the present application heats the engine oil in the oil pan by using the waste heat of the drive motor coolant, blocks the water vapor condensation path and accelerates the evaporation of water in the engine oil, reducing the risk of engine oil emulsification. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In combination with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the original elements and elements are not necessarily drawn to scale.

[0025] Figure 1Schematic diagram of the improvement of the hardware structure of a range-extended vehicle provided by this application;

[0026] Figure 2 Flowchart of the method for suppressing engine oil emulsification in a range-extended vehicle provided by this application;

[0027] Figure 3 Schematic diagram of the structure of the device for suppressing engine oil emulsification in a range-extended vehicle provided by this application.

[0028] Reference numerals:

[0029] 1 - oil pan; 2 - branch pipeline; 3 - electronic valve; 4 - crankcase; 5 - coolant inlet; 6 - coolant outlet; 7 - moisture discharge pipeline; 8 - exhaust gas exhaust pipe; 9 - electric breather; C - compressor end of the turbocharger; T - turbine end of the turbocharger; 100 - acquisition unit; 200 - operating condition control unit; 300 - shutdown transition control unit; 400 - post-shutdown treatment control unit. Detailed implementation manners

[0030] The embodiments of this application provide a method for suppressing engine oil emulsification in a range-extended vehicle and related products. By improving the hardware structure and optimizing the software design on the range-extended vehicle, the risk of engine oil emulsification caused by long-term engine shutdown (such as in the cold engine state; the cold engine state means that the engine water temperature and oil temperature are both close to the ambient temperature, typically the state when starting the vehicle early in the morning after it has been parked overnight) or frequent engine start-stop and other operating conditions is reduced, and the effective control of the risk of engine oil emulsification is achieved.

[0031] Next, with reference to the accompanying drawings, a method for suppressing engine oil emulsification in a range-extended vehicle provided by the embodiments of this application will be described in detail. Those of ordinary skill in the art will know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this application are equally applicable to similar technical problems.

[0032] The terms "first", "second", etc. in the description and claims of this application and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing objects with the same attributes when describing the embodiments of this application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device including a series of units does not have to be limited to those units, but may include other units that are not clearly listed or are inherent to these process, method, product or device.

[0033] See Figure 1 , the hardware structure improvements made by the embodiments of this application on the range-extended vehicle include:

[0034] Integrate a branch pipeline 2 of the driving motor coolant circulation circuit inside the oil pan 1 of the crankcase 4 of the range-extended vehicle;

[0035] An electronic valve 3 is provided on the branch pipeline 2 (the electronic valve is a device that uses an electric signal to drive an actuator to realize the on / off or flow control of the fluid), and the electronic valve 3 is electrically connected to the vehicle electronic control unit; the electronic valve 3 can be arranged at the coolant inlet 5, the coolant outlet 6 or the middle section of the pipeline of the branch pipeline 2, Figure 1 Only taking the case where the electronic valve 3 is arranged at the coolant inlet 5 of the branch pipeline 2 as an example for illustration;

[0036] When the electronic valve 3 is opened, the branch pipeline 2 is used to guide part of the coolant after completing the heat exchange of the driving motor into the oil pan 1, so that it exchanges heat with the engine oil in the oil pan 1. After the heat exchange, the coolant flows back into the driving motor coolant circulation circuit, mixes with the return liquid of other branches in the circuit, and is cooled to a preset temperature range by a cooling source (the cooling source in the driving motor coolant circulation circuit is used to reduce the temperature of the circulating coolant through heat exchange or refrigeration technology, so as to transfer the heat generated during the operation of the driving motor and ensure that the driving motor is maintained within a reasonable temperature range; this cooling source is, for example, an air-cooled heat exchanger or a refrigeration unit, etc.), and then flows back to the driving motor to conduct a new round of heat exchange, forming a closed-loop cycle.

[0037] Based on the above improvement of the hardware structure, see Figure 2 , a method for suppressing engine oil emulsification of a range-extended vehicle provided by an embodiment of the present application includes:

[0038] Step S01: Obtain the engine oil temperature T1 in the oil pan 1 and the coolant temperature T2 in the branch pipeline 2, and then enter step S02.

[0039] Step S02: Judge whether the engine oil temperature T1 in the oil pan 1 is lower than the coolant temperature T2 in the branch pipeline 2. If so, enter step S03; if not, enter step S04.

[0040] Step S03: Control the electronic valve 3 to open, and then return to step S01.

[0041] Step S04: Control the electronic valve 3 to close, and then return to step S01.

[0042] Specifically, Figure 2The illustrated embodiment monitors the engine oil temperature T1 in the oil pan 1 and the coolant temperature T2 in the branch pipeline 2 in real time, and controls the opening and closing of the electronic valve 3 according to the comparison result of the two temperatures, forming a closed-loop thermal management control logic based on temperature thresholds. Among them, the engine oil temperature T1 in the oil pan 1 and the coolant temperature T2 in the branch pipeline 2 can be obtained in real time through the following two methods:

[0043] I. Direct measurement

[0044] The engine oil temperature T1 in the oil pan 1 is directly measured by an engine oil temperature sensor installed in the crankcase oil pan 1; the coolant temperature T2 in the branch pipeline 2 is directly measured by a coolant temperature sensor installed in the branch pipeline 2.

[0045] II. Estimation based on a model

[0046] By establishing a mathematical model of the vehicle thermal management system, combining the operating conditions of the vehicle (such as engine speed, load, ambient temperature, etc.) and known heat transfer characteristics (such as heat conduction, convection, and radiation, etc.), the engine oil temperature T1 in the oil pan 1 and the coolant temperature T2 in the branch pipeline 2 are estimated.

[0047] When T1 < T2, the vehicle electronic control unit controls the opening of the electronic valve 3, thereby introducing the high-temperature coolant after heat exchange with the drive motor into the oil pan. Through the forced convection heat transfer between the high-temperature coolant and the engine oil in the oil pan, the engine oil temperature in the oil pan is quickly increased to above the dew point temperature (the temperature at which water vapor in the air reaches the saturation state and begins to condense), effectively blocking the water vapor condensation path and accelerating the evaporation of water in the engine oil. Specifically: Since the coolant of the drive motor heats up relatively quickly, this mechanism can quickly increase the engine oil temperature in the oil pan, avoiding the condensation of water vapor into liquid water due to too low engine oil temperature, thereby reducing the risk of engine oil emulsification; even if a small amount of water has already mixed into the engine oil, the heat transfer of the high-temperature coolant can also accelerate the evaporation of water, which can also reduce the risk of engine oil emulsification.

[0048] When T1 ≥ T2, the vehicle electronic control unit closes the electronic valve 3 to prevent the aggravation of engine oil emulsification and the occurrence of other adverse reactions caused by too high coolant temperature (such as a significant acceleration of the engine oil oxidation rate, the formation of varnish deposits and blockage of the oil passage).

[0049] In summary, Figure 2 The illustrated embodiment heats the engine oil in the oil pan by means of the waste heat of the drive motor coolant, blocks the water vapor condensation path and accelerates the evaporation of water in the engine oil, reducing the risk of engine oil emulsification. Compared with additionally introducing an electric heater to heat the engine oil in the oil pan, Figure 2 the illustrated embodiment does not require additional power consumption and has a faster thermal response speed.

[0050] Still referring to Figure 1, the branch pipeline 2 is, for example, a serpentine cooling pipeline ( Figure 1 is a longitudinal sectional view), so as to greatly increase the heat exchange area between the high-temperature coolant and the engine oil by extending the flow path of the coolant in the oil pan 1, and significantly reduce the risk of engine oil emulsification.

[0051] In a possible implementation, to avoid frequent on-off of the electronic valve 3 caused by frequent fluctuations of T1 and T2, a hysteresis control strategy can also be introduced to the Figure 2 embodiment shown, that is: a first preset value ΔT1 and a second preset value ΔT2 are preset in advance, and both ΔT1 and ΔT2 are slightly greater than zero; when it is detected that T1 < T1 - ΔT1, control the electronic valve 3 to open; when it is detected that T1 ≥ T1 + ΔT2, control the electronic valve 3 to close. Thus, small fluctuation interference is eliminated through the temperature buffer range (a temperature range with a lower boundary of T1 - ΔT1 and an upper boundary of T1 + ΔT2 formed based on the target temperature T1).

[0052] When the engine carried by the range-extended vehicle is a gas engine (i.e., a gas engine model), such a range-extended vehicle is usually called a gas-electric hybrid range-extended vehicle. The gas engine / gas engine model refers to an engine that uses combustible gas (such as natural gas) as fuel. In a possible implementation, when the range-extended vehicle in any of the above embodiments is a gas-electric hybrid range-extended vehicle, to further reduce the risk of engine oil emulsification, the operation logic before engine shutdown can also be optimized. Correspondingly, any of the above-provided methods for suppressing engine oil emulsification of a range-extended vehicle can also include: when receiving an engine shutdown command, cut off the gas supply of the gas injection system to the engine, and control the drive motor to reversely drag the engine, so that the engine runs continuously at a preset speed V1 for a first preset time t1, and then control the drive motor to stop reversely dragging the engine.

[0053] Specifically, water vapor is mixed into the gas during the extraction and transportation processes, and water vapor is also generated during the gas combustion process. If the gas engine is immediately controlled to stop when the gas supply is cut off, the unburned gas in the cylinder will leak into the crankcase through the piston ring gap, not only diluting the engine oil but also introducing extra moisture, increasing the risk of engine oil emulsification. In response to this, in the embodiment of the present application, when the vehicle electronic control unit receives an engine stop command, it stops injecting gas into the gas engine and controls the drive motor to reversely drag the gas engine (at this time, the engine is in a "passive idling" state, and its energy comes from the power battery without combustion drive). After the gas engine runs continuously at a preset speed V1 for a first preset time t1, the control of the drive motor to reversely drag is stopped, and the gas engine gradually stops under the action of frictional resistance. This method can prevent unburned gas from entering the crankcase to reduce the dilution of unburned gas, and at the same time use the waste heat of the gas engine to evaporate the water vapor in the crankcase (including the oil pan), thereby further reducing the risk of engine oil emulsification. Among them, the triggering condition of the engine stop command can be the driver's active operation (such as pressing the ignition-off button) or automatically triggered by the energy management strategy (such as when the battery of the range-extended vehicle is fully charged).

[0054] Among them, the preset speed V1 should be set relatively low to reduce the operating noise and optimize the driving experience; the preset speed V1 is set, for example, to a speed lower than the vehicle idle speed. The first preset time t1 can be set to 120 seconds, for example.

[0055] In a possible implementation, the preset speed V1 and the first preset time t1 can also be dynamically adjusted according to the engine oil temperature in the oil pan (the preset speed V1 is preferably adjusted within the range lower than the vehicle idle speed). For example, when the engine oil temperature in the oil pan is higher than the preset threshold, the preset speed V1 is reduced and / or the first preset time t1 is shortened; when the engine oil temperature in the oil pan is lower than the preset threshold, the preset speed V1 is increased and / or the first preset time t1 is extended. This dynamic adjustment mechanism optimizes the waste heat utilization efficiency through engine oil temperature feedback, avoiding energy waste under high-temperature conditions and insufficient water vapor evaporation under low-temperature conditions.

[0056] In a possible implementation, when the range-extended vehicle in any of the above embodiments is a gas-electric hybrid range-extended vehicle, to further reduce the risk of engine oil emulsification, the operating logic after the engine stops can be optimized. Correspondingly, still referring to Figure 1, the hardware structure improvement of the extended-range vehicle in the embodiment of the present application also includes: the crankcase 4 is equipped with a dehumidification pipeline 7; one end of the dehumidification pipeline 7 is connected to the inside of the crankcase 4, and the other end is connected to the exhaust pipe 8; and the dehumidification pipeline 7 is provided with an electric respirator 9 (a device for forcibly discharging the gas in the crankcase 4 through electric drive). Correspondingly, any of the above-mentioned methods for inhibiting oil emulsification of extended-range vehicles also includes: when the engine is running, controlling the electric respirator 9 to be in a running state; when receiving an engine shutdown command, controlling the electric respirator 9 to continue to run for a second preset time t2, and then controlling the electric respirator 9 to stop running.

[0057] Specifically, after being filtered by the air filter, the outside air enters the compressor end C of the turbocharger for supercharging. After being cooled by the intercooler, the supercharged air enters the cylinder through the intake manifold to participate in combustion. After the exhaust gas generated by the engine combustion is discharged from the cylinder, it first flows into the turbine end T of the turbocharger, and uses the kinetic energy of the exhaust gas to drive the turbine to rotate to achieve energy recovery. Then the exhaust gas enters the exhaust pipe 8, and is discharged outside the vehicle after being processed by the catalytic converter, muffler, etc. inside it. After the dehumidification pipeline 7 and the electric respirator 9 are introduced, during the operation of the engine, the electric respirator 9 continues to operate, actively extracts the humid gas in the crankcase 4, accelerates the evaporation of water through the high temperature of the exhaust gas, and uses the negative pressure of the exhaust gas to quickly discharge the mixed gas; and after receiving the engine shutdown command, the electric respirator 9 continues to operate for the second preset time t2 and then stops. This delayed operation mechanism ensures that the residual moisture is discharged to the maximum extent. The discharged moisture is quickly evaporated into water vapor with the help of the residual heat of the exhaust pipe 8 and discharged with the exhaust gas, avoiding the condensation of moisture after the engine is stopped, thereby further reducing the risk of oil emulsification. The second preset time t2 can be dynamically adjusted according to the ambient humidity parameter in the crankcase.

[0058] For gas-electric hybrid extended-range vehicles, the above solutions can all be applied to the same vehicle, effectively reducing the risk of oil emulsification by heating the oil pan, optimizing the operation logic before engine shutdown, and optimizing the operation logic after engine shutdown (covering the three stages of engine operation, engine shutdown preparation, and after engine shutdown). As shown in Table 1 below:

[0059] Table 1-Comparison table of risk control and action effects of oil management in all working conditions for gas-electric hybrid extended-range vehicles

[0060]

[0061] Corresponding to the above method embodiments, an oil emulsification suppression device for a range-extended vehicle is further provided in an embodiment of the present application. A branch pipeline of a drive motor coolant circulation loop is integrated inside the crankcase oil pan of the range-extended vehicle, and an electronic valve is provided on the branch pipeline; when the electronic valve is opened, the branch pipeline is used to guide a part of the coolant after heat exchange of the drive motor to the oil pan, so that it exchanges heat with the engine oil in the oil pan, and the coolant after heat exchange is then incorporated into the drive motor coolant circulation loop; see Figure 3 , the oil emulsification suppression device of the range-extended vehicle includes:

[0062] An acquisition unit 100, configured to acquire the engine oil temperature in the oil pan and the coolant temperature in the branch pipeline;

[0063] An operating condition control unit 200, configured to control the electronic valve to open when it is detected that the engine oil temperature in the oil pan is lower than the coolant temperature in the branch pipeline; and control the electronic valve to close when it is detected that the engine oil temperature in the oil pan is not lower than the coolant temperature in the branch pipeline.

[0064] In a possible implementation, the engine of the range-extended vehicle is a gas engine; still referring to Figure 3 , the oil emulsification suppression device of the range-extended vehicle further includes: a shutdown transition control unit 300, configured to cut off the gas supply of the gas injection system to the engine when receiving an engine shutdown instruction, and control the drive motor to reversely drag the engine, so that the engine runs at a preset speed for a first preset time, and then control the drive motor to stop reversely dragging the engine.

[0065] In a possible implementation, the engine of the range-extended vehicle is a gas engine; the crankcase is configured with a moisture drainage pipeline, one end of the moisture drainage pipeline is communicated with the inside of the crankcase, and the other end is communicated with the tail gas exhaust pipe; and an electric breather is provided on the moisture drainage pipeline; still referring to Figure 3 , the oil emulsification suppression device of the range-extended vehicle further includes: a post-shutdown processing control unit 400, configured to control the electric breather to be in an operating state when the engine is running; and control the electric breather to continue running for a second preset time when receiving an engine shutdown instruction, and then control the electric breather to stop running.

[0066] In addition, an embodiment of the present application further provides a computer program product, including computer-readable instructions, which when running on a vehicle electronic control unit, enable the vehicle electronic control unit to implement any oil emulsification suppression method for a range-extended vehicle provided in an embodiment of the present application.

[0067] An embodiment of the present application further provides a vehicle electronic control unit, including at least one processor and a memory connected to the processor, wherein:

[0068] The memory is used to store a computer program;

[0069] The processor is used to execute the computer program so that the vehicle electronic control unit can implement any one of the engine oil emulsification suppression methods for range-extended vehicles provided by the embodiments of the present application.

[0070] An embodiment of the present application further provides a computer-readable storage medium, which carries one or more computer programs. When the one or more computer programs are executed by a vehicle electronic control unit, the vehicle electronic control unit can implement any one of the engine oil emulsification suppression methods for range-extended vehicles provided by the embodiments of the present application.

[0071] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the device embodiments provided in the present application, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines.

[0072] For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For the relevant parts, reference can be made to the description in the method part.

[0073] Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary general hardware. Of course, it can also be implemented by dedicated hardware including application-specific integrated circuits, dedicated CPUs, dedicated memories, dedicated components, etc. Generally, functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structures for implementing the same function can also be various, such as analog circuits, digital circuits, or dedicated circuits, etc. However, for the present application, in more cases, software program implementation is a better implementation manner. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, such as a floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disc of a computer, etc., and includes several instructions to enable a computer device (which can be a personal computer, training device, or network device, etc.) to execute the methods described in various embodiments of the present application.

[0074] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product.

[0075] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, training device, or data center to another website, computer, training device, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store, or a data storage device such as a training device or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0076] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present application. Therefore, the embodiments of the present application will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oil emulsification inhibition method for a range-extended vehicle, characterized in that Inside the crankcase oil pan of the range-extended vehicle, a branch pipeline of the driving motor coolant circulation loop is integrated, and an electronic valve is provided on the branch pipeline; when the electronic valve is opened, the branch pipeline is used to guide a part of the coolant after heat exchange of the driving motor into the oil pan, so that it exchanges heat with the engine oil in the oil pan, and the coolant after heat exchange is then merged into the driving motor coolant circulation loop; the method includes: Obtain the engine oil temperature in the oil pan and the coolant temperature in the branch pipeline; When it is detected that the engine oil temperature in the oil pan is lower than the coolant temperature in the branch pipeline, control the electronic valve to open; when it is detected that the engine oil temperature in the oil pan is not lower than the coolant temperature in the branch pipeline, control the electronic valve to close.

2. The method for suppressing engine oil emulsification of the range-extended vehicle according to claim 1, wherein The "When it is detected that the engine oil temperature in the oil pan is lower than the coolant temperature in the branch pipeline, control the electronic valve to open; when it is detected that the engine oil temperature in the oil pan is not lower than the coolant temperature in the branch pipeline, control the electronic valve to close." is replaced with: When it is detected that the engine oil temperature in the oil pan is lower than the difference between the coolant temperature in the branch pipeline and a first preset value, control the electronic valve to open; when it is detected that the engine oil temperature in the oil pan is not lower than the sum of the coolant temperature in the branch pipeline and a second preset value, control the electronic valve to close; both the first preset value and the second preset value are greater than zero.

3. The method for suppressing engine oil emulsification of a range-extended vehicle according to claim 1 or 2, characterized in that, The engine of the range-extended vehicle is a gas engine; The method further includes: when receiving an engine shutdown instruction, cut off the gas supply of the gas injection system to the engine, and control the driving motor to reversely drag the engine, so that the engine runs at a preset speed continuously for a first preset time, and then control the driving motor to stop reversely dragging the engine.

4. The method for suppressing engine oil emulsification of the range-extended vehicle according to claim 3, wherein The preset speed is lower than the vehicle idle speed.

5. The method for suppressing engine oil emulsification of the range-extended vehicle according to claim 3, wherein The preset speed and the first preset time are dynamically adjusted according to the engine oil temperature in the oil pan.

6. The method for suppressing engine oil emulsification of a range-extended vehicle according to claim 1 or 2, characterized in that The engine of the range-extended vehicle is a gas engine; the crankcase is configured with a moisture drainage pipeline, one end of the moisture drainage pipeline is communicated with the inside of the crankcase, and the other end is communicated with the tail gas exhaust pipe; and an electric breather is provided on the moisture drainage pipeline; The method further includes: when the engine is running, control the electric breather to be in an operating state; when receiving an engine shutdown instruction, control the electric breather to continue running for a second preset time, and then control the electric breather to stop running.

7. The method for suppressing engine oil emulsification of the range-extended vehicle according to claim 6, wherein The second preset time is dynamically adjusted according to the ambient humidity parameter in the crankcase.

8. A computer program product, characterized in that, Including computer-readable instructions, when the computer-readable instructions run on a vehicle electronic control unit, the vehicle electronic control unit realizes the method for suppressing engine oil emulsification of the range-extended vehicle as described in any one of claims 1 to 7.

9. A vehicle electronic control unit, characterized in that, Including at least one processor and a memory connected to the processor, wherein: The memory is used for storing a computer program; The processor is used to execute the computer program so that the vehicle electronic control unit can implement the method for suppressing engine oil emulsification of the range-extended vehicle as described in any one of claims 1 to 7.

10. A computer storage medium, characterized in that, The storage medium carries one or more computer programs, and when the one or more computer programs are executed by the vehicle electronic control unit, the vehicle electronic control unit can implement the method for suppressing engine oil emulsification of the range-extended vehicle as described in any one of claims 1 to 7.

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