Control method and device of engine, readable storage medium, program product

Abstract

The application discloses an engine control method and device, a readable storage medium and a program product. The method comprises the following steps: obtaining the current running state of the engine and the current oil temperature of the engine oil; in the case that it is determined according to the running state that the engine currently has a potential heating demand, determining the starting heating temperature threshold and the stopping heating temperature threshold of the heating device according to the running state, wherein the starting heating temperature threshold is lower than the stopping heating temperature threshold; in the case that the current oil temperature is lower than the starting heating temperature threshold, controlling the heating device to heat the engine oil by using the electric energy supplied by the power battery until the oil temperature of the engine reaches the stopping heating temperature threshold, so that the water content of the engine oil is lower than the preset water content threshold. The application solves the technical problem that the normal operation of the engine is affected due to the emulsification of the engine oil, and the service life and performance of the engine are affected.

Description

Technical Field

[0001] This application relates to the field of automotive engineering technology, and more specifically, to an engine control method and apparatus, a readable storage medium, and a program product. Background Technology

[0002] In traditional internal combustion engines, the engine oil temperature is naturally raised through internal friction and the heat generated by combustion, thus lubricating and protecting engine components. However, in methanol, hydrogen, and natural gas engines, the combustion products contain a large amount of water, especially when operating at low temperatures. This water easily cools down and mixes into the engine oil when the engine is stopped or under low load, causing emulsification. Emulsified oil not only loses its original lubricating properties but also accelerates the wear of engine components, affecting engine life and overall performance.

[0003] There is currently no effective solution to the problem of engine oil emulsification affecting normal engine operation, engine life, and performance in the aforementioned technologies. Summary of the Invention

[0004] This application provides an engine control method and apparatus, a readable storage medium, and a program product to at least solve the technical problem in the related art that oil emulsification affects the normal operation of the engine and its lifespan and performance.

[0005] According to one aspect of the embodiments of this application, an engine control method is provided, wherein the engine oil pan includes a heating device connected to a vehicle's power battery, the method comprising: acquiring the current operating state of the engine and the current oil temperature of the engine oil; if it is determined that the engine currently has a potential heating demand based on the operating state, determining a start heating temperature threshold and a stop heating temperature threshold for the heating device based on the operating state, wherein the start heating temperature threshold is lower than the stop heating temperature threshold; if the current oil temperature is lower than the start heating temperature threshold, controlling the heating device to heat the oil using electrical energy supplied by the power battery until the engine oil temperature reaches the stop heating temperature threshold, so that the water content of the oil is lower than a preset water content threshold.

[0006] Optionally, determining the potential heating requirement of the engine based on the operating state includes: when the operating state is a stopped state, if it is determined that the operating parameters of the vehicle meet the starting conditions of the engine, and / or, if it is determined that the temperature change rate of the engine oil within a predetermined period of time after the engine enters the stopped state reaches a preset change rate threshold, then it is determined that the engine currently has the potential heating requirement; when the operating state is a started state, the current required torque of the engine is obtained, and if the current required torque does not reach a preset torque threshold, it is determined that the engine currently has the potential heating requirement.

[0007] Optionally, the operating parameters include at least one of the following: vehicle speed, remaining battery power, and drive power. Determining that the vehicle's operating parameters meet the engine's starting conditions includes at least one of the following: acquiring the vehicle's current operating speed, and determining that the operating parameters meet the engine's starting conditions when the operating speed reaches a preset speed threshold; acquiring the vehicle's current remaining battery power, and determining that the operating parameters meet the engine's starting conditions when the remaining battery power is lower than a preset battery power threshold; acquiring the vehicle's current drive power, and determining that the operating parameters meet the engine's starting conditions when the drive power reaches a preset power threshold.

[0008] Optionally, determining the start heating temperature threshold and stop heating temperature threshold of the heating device based on the operating state includes: when the operating state is a shutdown state, obtaining the first current charge of the power battery; determining the minimum starting oil temperature corresponding to the first current charge in a first preset mapping relationship as the start heating temperature threshold and the target starting oil temperature as the stop heating temperature threshold, wherein the first preset mapping relationship is used to record the mapping relationship between the charge of the power battery and the starting oil temperature, and the starting oil temperature includes the minimum starting oil temperature and the target starting oil temperature.

[0009] Optionally, determining the start heating temperature threshold and stop heating temperature threshold of the heating device based on the operating state includes: when the operating state is the start state, obtaining the second current charge of the power battery; determining the minimum operating oil temperature corresponding to the second current charge and the current required torque of the engine in the second preset mapping relationship as the start heating temperature threshold and the target operating oil temperature as the stop heating temperature threshold, wherein the second preset mapping relationship is used to record the mapping relationship between the charge of the power battery, the required torque and the operating oil temperature, and the operating oil temperature includes the minimum operating oil temperature and the target operating oil temperature.

[0010] Optionally, the engine control method further includes: when the operating state is the start state, if a stop command for the engine is received, obtaining the current motor speed; when the motor speed reaches a first speed threshold, controlling the clutch between the motor and the engine to engage, so that the engine enters an idling state driven by the motor, wherein the heat generated by the engine in the idling state is used to reduce the water content in the engine oil; obtaining the engine speed in the idling state according to a predetermined time period; and after determining that the engine has been running at an engine speed not lower than a second speed threshold for a predetermined time period, controlling the engine to enter a stop state based on the stop command.

[0011] Optionally, determining the duration for which the engine operates at a speed not lower than a second speed threshold to reach a predetermined timing duration includes: obtaining the third current charge of the power battery; determining the timing duration corresponding to the current oil temperature and the third current charge in a third preset mapping relationship as the predetermined timing duration, wherein the third preset mapping relationship is used to record the mapping relationship between the oil temperature, the charge of the power battery and the timing duration.

[0012] According to another aspect of the embodiments of this application, an engine control device is also provided, wherein the engine oil pan includes a heating device externally, the heating device being connected to a vehicle's power battery, and includes: a first acquisition unit, configured to acquire the current operating state of the engine and the current oil temperature of the engine oil; a determination unit, configured to determine, based on the operating state, a start heating temperature threshold and a stop heating temperature threshold of the heating device, wherein the start heating temperature threshold is lower than the stop heating temperature threshold; and a control unit, configured to, when the current oil temperature is lower than the start heating temperature threshold, control the heating device to heat the oil using electrical energy supplied by the power battery until the engine oil temperature reaches the stop heating temperature threshold, so that the water content of the oil is lower than a preset water content threshold.

[0013] Optionally, the determining unit includes: a first determining module, configured to, when the operating state is a stopped state, determine that the engine currently has the potential heating requirement if it is determined that the operating parameters of the vehicle meet the starting conditions of the engine, and / or, it is determined that the temperature change rate of the engine oil within a predetermined period of time after the engine enters the stopped state reaches a preset change rate threshold; and a second determining module, configured to, when the operating state is a started state, obtain the current required torque of the engine, and determine that the engine currently has the potential heating requirement if the current required torque does not reach a preset torque threshold.

[0014] Optionally, the operating parameters include at least one of the following: vehicle speed, remaining battery power, and drive power. The first determining module includes at least one of the following: a first determining submodule, configured to acquire the current operating speed of the vehicle and, if the operating speed reaches a preset speed threshold, determine that the operating parameters meet the engine starting conditions; a second determining submodule, configured to acquire the current remaining battery power of the vehicle and, if the remaining battery power is lower than a preset battery power threshold, determine that the operating parameters meet the engine starting conditions; and a third determining submodule, configured to acquire the current drive power of the vehicle and, if the drive power reaches a preset power threshold, determine that the operating parameters meet the engine starting conditions.

[0015] Optionally, the determining unit includes: a first acquisition module, configured to acquire the first current charge of the power battery when the operating state is a shutdown state; and a third determining module, configured to determine the minimum starting oil temperature corresponding to the first current charge in a first preset mapping relationship as the starting heating temperature threshold and the target starting oil temperature as the stopping heating temperature threshold, wherein the first preset mapping relationship is used to record the mapping relationship between the charge of the power battery and the starting oil temperature, and the starting oil temperature includes the minimum starting oil temperature and the target starting oil temperature.

[0016] Optionally, the determining unit includes: a second acquisition module, configured to acquire the second current charge of the power battery when the operating state is the start state; and a fourth determining module, configured to determine the minimum operating oil temperature corresponding to the second current charge and the current required torque of the engine in the second preset mapping relationship as the start heating temperature threshold and the target operating oil temperature as the stop heating temperature threshold, wherein the second preset mapping relationship is used to record the mapping relationship between the charge of the power battery, the required torque and the operating oil temperature, and the operating oil temperature includes the minimum operating oil temperature and the target operating oil temperature.

[0017] Optionally, the engine control device further includes: a second acquisition unit, configured to acquire the current motor speed of the motor if a stop command is received when the operating state is the start state; a first control unit, configured to control the clutch between the motor and the engine to engage when the motor speed reaches a first speed threshold, so that the engine enters an idling state driven by the motor, wherein the heat generated by the engine in the idling state is used to reduce the water content in the engine oil; a third acquisition unit, configured to acquire the engine speed of the engine in the idling state according to a predetermined time period; and a second control unit, configured to control the engine to enter a stop state based on the stop command after determining that the engine has been running at an engine speed not lower than the second speed threshold for a predetermined time period.

[0018] Optionally, the second control unit includes: a third acquisition module, used to acquire the third current charge of the power battery; and a fifth determination module, used to determine the timing duration corresponding to the current oil temperature and the third current charge in the third preset mapping relationship as the predetermined timing duration, wherein the third preset mapping relationship is used to record the mapping relationship between the oil temperature, the charge of the power battery and the timing duration.

[0019] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes any of the engine control methods described above.

[0020] According to another aspect of the embodiments of this application, a computer program product is also provided, including computer instructions, which, when executed by a processor, perform any of the engine control methods described above.

[0021] In this embodiment, the current operating status of the engine and the current oil temperature can be obtained first. Then, if it is determined that the engine has a potential heating requirement based on the operating status, the start heating temperature threshold and stop heating temperature threshold of the heating device can be determined based on the operating status. Finally, if the current oil temperature is lower than the start heating temperature threshold, the heating device can be controlled to heat the oil using electrical energy supplied by the power battery until the engine oil temperature reaches the stop heating temperature threshold, so that the water content of the oil is lower than a preset water content threshold. Through the above technical solution, the purpose of determining whether the oil needs to be heated by combining the engine operating status and oil temperature is achieved, and the heating device installed in the oil pan can be controlled to heat the oil using electrical energy supplied by the power battery when necessary. This achieves the technical effect of heating the oil under appropriate conditions to improve its emulsification phenomenon, reducing the impact of oil emulsification on engine operation, avoiding resource waste caused by overheating of the oil, improving engine life and performance, and thus solving the technical problem in related technologies where oil emulsification affects the normal operation of the engine and affects engine life and performance. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is a hardware structure block diagram of a mobile terminal for an engine control method according to an embodiment of this application.

[0024] Figure 2 This is a flowchart of an engine control method according to an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of a P2 parallel hybrid power system according to an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of another P2 parallel hybrid power system according to an embodiment of this application;

[0027] Figure 5 This is a flowchart of an optional engine control method according to an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of an engine control device according to an embodiment of this application.

[0029] The above figures include the following reference numerals:

[0030] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device; 1. Engine; 2. Clutch; 3. Motor; 4. Motor controller; 5. Power battery; 6. Gearbox; 7. Control switch; 8. Heating device. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] As described in the background section, in related technologies, oil emulsification affects the normal operation of the engine, as well as its lifespan and performance. To address these shortcomings, embodiments of this application provide an engine control method and apparatus, a readable storage medium, and a program product.

[0034] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0035] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for an engine control method according to an embodiment of this application. For example... Figure 1 As shown, a mobile terminal may include one or more ( Figure 1Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0036] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the engine control method in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thus implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0037] According to an embodiment of this application, a method embodiment for controlling an engine is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0038] Figure 2 This is a flowchart of an engine control method according to an embodiment of this application, such as... Figure 2 As shown, the method includes the following steps:

[0039] Step S202: Obtain the current operating status of the engine and the current oil temperature in the engine.

[0040] Optionally, the oil pan of the engine may include a heating device on its exterior, and the heating device may be connected to the vehicle's power battery.

[0041] In this embodiment, the current operating status of the engine and the current temperature of the engine oil (i.e., the current oil temperature) can be obtained first, so that it can be determined whether the oil needs to be heated in order to improve its emulsification phenomenon.

[0042] Step S204: If it is determined that there is a potential heating demand for the engine based on the operating status, the start heating temperature threshold and the stop heating temperature threshold of the heating device are determined based on the operating status, wherein the start heating temperature threshold is lower than the stop heating temperature threshold.

[0043] Optionally, the above-mentioned starting heating temperature threshold is a threshold for determining whether the heating device needs to be turned on to heat the engine oil.

[0044] Optionally, the aforementioned stop heating temperature threshold is the threshold used to determine whether the heating device needs to be turned off to stop heating the engine oil during the operation of the heating device.

[0045] In this embodiment, it can be first determined whether there is a potential need to heat the engine oil based on the engine's operating status (i.e., potential heating need). Then, if it is determined that there is a potential heating need, the start heating temperature threshold and stop heating temperature threshold of the heating device can be determined in combination with the engine's operating status, so as to facilitate the subsequent control of the heating device to heat the engine oil.

[0046] Step S206: When the current oil temperature is lower than the starting heating temperature threshold, control the heating device to use the electrical energy supplied by the power battery to heat the oil until the engine oil temperature reaches the stopping heating temperature threshold, so that the water content of the oil is lower than the preset water content threshold.

[0047] In this embodiment, when the oil temperature is lower than the starting heating temperature threshold, the heating device can be controlled to heat the oil using electrical energy supplied by the power battery until the oil temperature in the engine reaches the stopping heating temperature threshold, thereby reducing the water content in the oil and improving the oil emulsification phenomenon.

[0048] As can be seen from the above, by applying the technical solution provided in the above embodiments of this application, the current operating state of the engine and the current oil temperature in the engine can be obtained first; then, if it is determined that there is a potential heating demand in the engine based on the operating state, the start heating temperature threshold and stop heating temperature threshold of the heating device can be determined based on the operating state; finally, if the current oil temperature is lower than the start heating temperature threshold, the heating device can be controlled to use the electrical energy supplied by the power battery to heat the oil until the engine oil temperature reaches the stop heating temperature threshold, so that the water content of the oil is lower than the preset water content threshold. This achieves the purpose of determining whether the oil needs to be heated by combining the engine operating state and the oil temperature, and controlling the heating device installed in the oil pan to use the electrical energy supplied by the power battery to heat the oil when necessary. This achieves the technical effect of heating the oil under appropriate conditions to improve its emulsification phenomenon, which reduces the impact of oil emulsification on engine operation, avoids resource waste caused by overheating of the oil, and improves engine life and performance.

[0049] Therefore, the technical solutions provided by the above embodiments of this application solve the technical problems in the related art where oil emulsification affects the normal operation of the engine and its lifespan and performance.

[0050] The following is combined Figure 3 and Figure 4 The embodiments described above in this application will be explained in detail. Figure 3 This is a schematic diagram of a P2 parallel hybrid power system according to an embodiment of this application. Figure 4 This is a schematic diagram of another P2 parallel hybrid power system according to an embodiment of this application.

[0051] like Figure 3 As shown, the P2 parallel hybrid system mainly includes an engine 1, an electric motor 3 and a motor controller 4, a clutch 2, a gearbox 6, and a power battery 5. The controller for the entire system is the HCU, which can coordinate the operation of various components such as the engine 1, the electric motor 3, the clutch 2, the gearbox 6, and the power battery 5. The clutch 2 is located between the engine 1 and the electric motor 3. When the clutch 2 is disengaged, only the electric motor 3 drives the vehicle. When the clutch 2 is engaged, the hybrid mode is entered, and the engine 1 and the electric motor 3 jointly drive the vehicle. For hybrid systems such as the P2 parallel hybrid system, since there is energy recovery and the engine can be controlled to generate electricity in a timely manner, and the vehicle has abundant high-voltage electricity resources, an oil heating device can be designed and connected to the vehicle's power battery to use the high-voltage electricity supplied by the power battery to heat the oil and increase its temperature.

[0052] like Figure 4As shown, a heating device 8 can be installed on the outside of the oil pan of the engine 1, attached to the outside of the oil pan. At the same time, the heating device 8 draws high voltage from the power battery 5 and controls the heating device 8 to turn on or off through the control switch 7.

[0053] In one specific embodiment of this application, determining the potential heating requirement of the engine based on its operating state includes: when the operating state is stopped, if it is determined that the vehicle's operating parameters meet the engine's starting conditions, and / or, if it is determined that the temperature change rate of the engine oil within a predetermined time after the engine enters the stopped state reaches a preset change rate threshold, then it is determined that the engine currently has a potential heating requirement; when the operating state is started, the current required torque of the engine is obtained, and if the current required torque does not reach a preset torque threshold, it is determined that the engine currently has a potential heating requirement.

[0054] The following is combined Figure 5 The embodiments described above in this application will be explained in detail. Figure 5 This is a flowchart of an optional engine control method according to an embodiment of this application.

[0055] like Figure 5 As shown, when the engine is currently off, the vehicle controller generally determines whether the engine needs to start based on some operating parameters (such as vehicle speed, SOC (State of Charge), and vehicle drive power requirements). To avoid oil emulsification due to low oil temperature when starting the engine next time, changes in oil temperature can be identified in advance during the shutdown process. The engine start requirement can be adjusted accordingly, and the oil temperature can be preheated. In other words, the start requirement is adjusted based on changes in oil temperature. Specifically, if the vehicle controller determines that the engine needs to start based on vehicle speed, SOC, and vehicle drive power requirements, or if the rate of change in oil temperature exceeds a certain value after shutdown, it is assumed that the oil temperature will drop very quickly as the vehicle operates, resulting in a low oil temperature before starting, which can easily cause oil emulsification. In this case, it can be considered that the engine currently has a potential need to heat the oil. Conversely, if the rate of change is low, it can be considered that the engine currently does not have a potential need to heat the oil.

[0056] For example, assuming that the average rate of change of engine oil temperature in historical data over a period of time immediately after engine shutdown exceeds a certain value, it is assumed that as the vehicle's operating time increases, the engine oil temperature will drop very quickly to an even lower level. This results in the engine oil temperature being at a low level before startup, which can easily cause oil emulsification. For instance, if the current engine oil temperature is 50℃, the previous time it was 55℃, and the next time it is 40℃, the rate of change 1 is (55-50) / change time (assuming 1s) = 5, the rate of change 2 is (50-40) / change time (assuming 1s) = 10, and the average rate of change is (5+10) / 2 = 7.5℃ / s. Setting a temperature change rate threshold of 5℃ / s, 7.5 > 5, an engine start-up request can be issued, indicating that the engine currently has a potential need to heat the engine oil.

[0057] like Figure 5 As shown, when the engine is currently running, the potential need for oil heating can be determined based on the engine's required torque percentage (the required torque percentage refers to the ratio of the required torque to the engine's maximum allowable torque, representing the engine load rate). For example, if the current required torque percentage is ≥30%, it can be assumed that the engine is about to enter a medium-high load range and does not require additional oil heating, meaning there is no potential need for oil heating. Conversely, if the current required torque percentage is 0-30%, it can be assumed that the engine is operating in a medium-low load range and requires appropriate additional oil heating, meaning there is a potential need for oil heating.

[0058] In one specific embodiment of this application, determining that the vehicle's operating parameters meet the engine starting conditions includes at least one of the following: obtaining the vehicle's current operating speed, and determining that the operating parameters meet the engine starting conditions when the operating speed reaches a preset speed threshold; obtaining the vehicle's current remaining battery power, and determining that the operating parameters meet the engine starting conditions when the remaining battery power is lower than a preset battery power threshold; obtaining the vehicle's current drive power, and determining that the operating parameters meet the engine starting conditions when the drive power reaches a preset power threshold.

[0059] Optionally, the above operating parameters include at least one of the following: operating speed, remaining battery power, and drive power.

[0060] Specifically, in a typical hybrid vehicle, the engine's starting requirement is usually determined based on the vehicle's operating status and energy demand; this may include, but is not limited to, the following key parameters: 1) Vehicle speed: Vehicle speed affects engine starting. In certain situations, such as high-speed driving or when high driving force is required, the engine may be started to provide additional power; 2) SOC (State of Charge): The remaining charge of the battery is an important factor in determining whether the engine starts. If the SOC is low, the engine may need to start to charge and restore the battery's charge; 3) Vehicle drive power demand: Based on the driver's request or the vehicle's operating conditions, such as uphill driving or acceleration, the system calculates the required drive power. If the electric motor alone cannot meet this demand, the engine needs to be started.

[0061] In one specific embodiment of this application, determining the start heating temperature threshold and stop heating temperature threshold of the heating device according to the operating state includes: when the operating state is a shutdown state, obtaining the first current charge of the power battery; determining the minimum starting oil temperature corresponding to the first current charge in the first preset mapping relationship as the start heating temperature threshold and the target starting oil temperature as the stop heating temperature threshold, wherein the first preset mapping relationship is used to record the mapping relationship between the charge of the power battery and the starting oil temperature, and the starting oil temperature includes the minimum starting oil temperature and the target starting oil temperature.

[0062] Optionally, the first preset mapping relationship mentioned above may include, but is not limited to, mapping relationships in the form of mapping tables, index trees, etc.

[0063] In this embodiment, when the engine is in a stopped state but there is a need to start it, the corresponding preset mapping table (here referring to the first preset mapping relationship) can be consulted according to the SOC of the power battery to obtain Tep1 (here referring to the start heating temperature threshold when the engine is stopped) and Tep2 (here referring to the stop heating temperature threshold when the engine is stopped). The higher the SOC, the higher the oil temperature setting value, to prevent the oil from being heated again when the SOC is too low, which would cause the SOC to be too low; at the same time, it prevents the heating device from being frequently turned on. For example, if the current SOC is 80%, then Tep1 is 65°C and Tep2 is 80°C; if the current SOC is 30%, then Tep1 is 50°C and Tep2 is 70°C.

[0064] In addition, such as Figure 5 As shown, when the engine is stopped and there is a current need to start (i.e. potential heating need), if the oil temperature is higher than Tep1, the heating device can be left uncontrolled to heat the oil. If the oil temperature is lower than a certain value Tep1, the electric heating device will be controlled to heat the oil in time, and the oil temperature will be preheated to a certain value Tep2 before the engine can be started.

[0065] In another specific embodiment of this application, determining the start heating temperature threshold and stop heating temperature threshold of the heating device according to the operating state includes: when the operating state is the start state, obtaining the second current charge of the power battery; determining the minimum operating oil temperature corresponding to the second current charge and the current required torque of the engine in the second preset mapping relationship as the start heating temperature threshold and the target operating oil temperature as the stop heating temperature threshold, wherein the second preset mapping relationship is used to record the mapping relationship between the charge of the power battery, the required torque and the operating oil temperature, and the operating oil temperature includes the minimum operating oil temperature and the target operating oil temperature.

[0066] Optionally, the aforementioned second preset mapping relationship may include, but is not limited to, mapping relationships in the form of mapping tables, index trees, etc.

[0067] In this embodiment, when the engine is running and there is a potential heating requirement, Tep3 (the starting heating temperature threshold when the engine is running) and Tep4 (the stopping heating temperature threshold when the engine is running) can be obtained by querying the corresponding preset mapping table (referring to the second preset mapping relationship) based on the engine's required torque percentage and SOC. For example, when the engine's required torque percentage is 20%, if the current SOC is 80%, then Tep3 is 80°C and Tep4 is 90°C; if the current SOC is 30%, then Tep3 is 70°C and Tep4 is 85°C.

[0068] In addition, such as Figure 5 As shown, if the oil temperature is higher than Tep3, the oil heating can be discontinued. If the oil temperature is lower than a certain value Tep3, the electric heating device will be controlled to heat the oil in time to preheat the oil temperature to a certain value Tep4.

[0069] In an optional embodiment of this application, the engine control method further includes: when the running state is in the start state, if a stop command is received, obtaining the current motor speed; when the motor speed reaches a first speed threshold, controlling the clutch between the motor and the engine to engage, so that the engine enters an idling state driven by the motor, wherein the heat generated by the engine in the idling state is used to reduce the water content in the engine oil; obtaining the engine speed in the idling state according to a predetermined time period; after determining that the engine has been running at an engine speed not lower than a second speed threshold for a predetermined time period, controlling the engine to enter a stop state based on the stop command.

[0070] like Figure 5As shown, in this embodiment, if the engine needs to be stopped when it is running and the current motor speed meets the conditions for towing the engine (i.e., the current motor speed is high enough to drive the engine), the clutch is gradually engaged, and the engine speed is driven by the transmission system to a certain value and maintained for a certain period of time (i.e., a predetermined time duration) before the engine is stopped. During this towing process, the engine does not inject fuel, i.e., it is in an idling state, so that the heat generated by the rotation can remove the water vapor in the crankcase and replace it with fresh air, thereby reducing the risk of oil emulsification to a certain extent.

[0071] For example, if the engine is running and a shutdown requirement is detected, and the current motor speed is higher than a certain value (e.g., 400 rpm, which is the first speed threshold), the clutch can be gradually engaged to drive the engine speed higher than a certain value (e.g., 350 rpm, which is the second speed threshold). The engine can then be controlled to maintain a speed higher than 350 rpm for a certain period of time (e.g., 10 seconds) before being shut down.

[0072] In one optional embodiment of this application, determining the duration for which the engine operates at an engine speed not lower than a second speed threshold to reach a predetermined timing duration includes: obtaining the third current charge of the power battery; determining the timing duration corresponding to the current oil temperature and the third current charge in a third preset mapping relationship as the predetermined timing duration, wherein the third preset mapping relationship is used to record the mapping relationship between the oil temperature, the charge of the power battery and the timing duration.

[0073] Optionally, the aforementioned third preset mapping relationship may include, but is not limited to, mapping relationships in the form of mapping tables, index trees, etc.

[0074] In this embodiment, the timing duration for controlling the engine to run at a speed higher than a second speed threshold (e.g., 350 rpm) in idling mode can be determined by querying the corresponding preset mapping table (here referring to the second preset mapping relationship) based on the SOC of the power battery and the current temperature of the engine oil. Generally, when the SOC is higher, it means that there is more power reserve in the power battery, which can support the electric heating device and the motor to perform driving operations for a longer period of time during shutdown without significantly affecting the state of charge of the battery. In low-temperature environments, the water in the engine oil is more likely to condense and form emulsions, requiring a longer driving time to heat the engine oil and promote the discharge of water vapor. Therefore, the lower the engine oil temperature and the higher the SOC, the longer the timing duration needs to be set in order to more fully remove water vapor and improve the air environment in the crankcase.

[0075] The specific data for the first, second, and third preset mapping relationships involved in the embodiments of this application can be set according to the actual situation. The specific values ​​given in the embodiments of this application are only examples and are not specifically limited here.

[0076] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0077] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0078] According to an embodiment of this application, a control device for an engine to implement the above-described engine control method is also provided. Figure 6 This is a schematic diagram of the engine control device according to an embodiment of this application, such as... Figure 6 As shown, the device includes: a first acquisition unit 61, a determination unit 63, and a control unit 65. The control device for this engine will now be described in detail.

[0079] The first acquisition unit 61 is used to acquire the current operating status of the engine and the current oil temperature in the engine.

[0080] The determining unit 63 is used to determine the start heating temperature threshold and the stop heating temperature threshold of the heating device according to the operating status when it is determined that there is a potential heating demand for the engine. The start heating temperature threshold is lower than the stop heating temperature threshold.

[0081] The control unit 65 is used to control the heating device to heat the engine oil using electrical energy supplied by the power battery when the current engine oil temperature is lower than the start heating temperature threshold, until the engine oil temperature reaches the stop heating temperature threshold, so that the water content of the engine oil is lower than the preset water content threshold.

[0082] It should be noted here that the first acquisition unit 61, the determination unit 63 and the control unit 65 mentioned above correspond to steps S202 to S206 in the above embodiments. The three units and the corresponding steps implement the same instances and application scenarios, but are not limited to the content disclosed in the above embodiments.

[0083] As can be seen from the above, in the scheme described in the above embodiments of this application, the first acquisition unit can first acquire the current operating state of the engine and the current oil temperature of the engine oil; then, the determination unit, based on the operating state, determines the start heating temperature threshold and stop heating temperature threshold of the heating device according to the operating state, where the start heating temperature threshold is lower than the stop heating temperature threshold; finally, the control unit, when the current oil temperature is lower than the start heating temperature threshold, controls the heating device to heat the oil using the electrical energy supplied by the power battery until the engine oil temperature reaches the stop heating temperature threshold, so that the water content of the oil is lower than the preset water content threshold. This achieves the purpose of determining whether the oil needs to be heated by combining the engine operating state and the oil temperature, and controlling the heating device installed in the oil pan to heat the oil using the electrical energy supplied by the power battery when necessary. This achieves the technical effect of heating the oil under appropriate conditions to improve its emulsification phenomenon, which reduces the impact of oil emulsification on engine operation and avoids resource waste caused by overheating of the oil, thereby improving engine life and performance.

[0084] Therefore, the technical solutions provided by the above embodiments of this application solve the technical problems in the related art where oil emulsification affects the normal operation of the engine and its lifespan and performance.

[0085] In one optional embodiment of this application, the determining unit includes: a first determining module, configured to, when the operating state is a stopped state, determine if the vehicle's operating parameters meet the engine's starting conditions, and / or determine if the oil temperature change rate within a predetermined time after the engine enters a stopped state reaches a preset change rate threshold, then determine that the engine currently has a potential heating requirement; and a second determining module, configured to, when the operating state is a started state, acquire the engine's current required torque, and determine that the engine currently has a potential heating requirement if the current required torque does not reach a preset torque threshold.

[0086] In one optional embodiment of this application, the operating parameters include at least one of the following: vehicle speed, remaining battery power, and drive power. The first determining module includes at least one of the following: a first determining submodule, used to acquire the current vehicle speed and, if the vehicle speed reaches a preset speed threshold, determine that the operating parameters meet the engine starting conditions; a second determining submodule, used to acquire the current remaining battery power and, if the remaining battery power is lower than a preset battery power threshold, determine that the operating parameters meet the engine starting conditions; and a third determining submodule, used to acquire the current drive power and, if the drive power reaches a preset power threshold, determine that the operating parameters meet the engine starting conditions.

[0087] In an optional embodiment of this application, the determining unit includes: a first acquisition module, configured to acquire the first current charge of the power battery when the operating state is a shutdown state; and a third determining module, configured to determine the minimum starting oil temperature corresponding to the first current charge in a first preset mapping relationship as the starting heating temperature threshold and the starting target oil temperature as the stopping heating temperature threshold, wherein the first preset mapping relationship is used to record the mapping relationship between the charge of the power battery and the starting oil temperature, and the starting oil temperature includes the minimum starting oil temperature and the starting target oil temperature.

[0088] In an optional embodiment of this application, the determining unit includes: a second acquisition module, used to acquire the second current charge of the power battery when the operating state is the start state; and a fourth determining module, used to determine the minimum operating oil temperature corresponding to the second current charge and the current required torque of the engine in the second preset mapping relationship as the start heating temperature threshold and the target operating oil temperature as the stop heating temperature threshold, wherein the second preset mapping relationship is used to record the mapping relationship between the charge of the power battery, the required torque and the operating oil temperature, and the operating oil temperature includes the minimum operating oil temperature and the target operating oil temperature.

[0089] In an optional embodiment of this application, the engine control device further includes: a second acquisition unit, configured to acquire the current motor speed of the motor if a stop command is received when the engine is in a start-up state; a first control unit, configured to control the clutch between the motor and the engine to engage when the motor speed reaches a first speed threshold, so that the engine enters an idling state driven by the motor, wherein the heat generated by the engine in the idling state is used to reduce the water content in the engine oil; a third acquisition unit, configured to acquire the engine speed in the idling state according to a predetermined time period; and a second control unit, configured to control the engine to enter a stop state based on a stop command after determining that the engine has been running at an engine speed not lower than the second speed threshold for a predetermined time period.

[0090] In one optional embodiment of this application, the second control unit includes: a third acquisition module for acquiring the third current charge of the power battery; and a fifth determination module for determining the timing duration corresponding to the current oil temperature and the third current charge in the third preset mapping relationship as a predetermined timing duration, wherein the third preset mapping relationship is used to record the mapping relationship between the oil temperature, the charge of the power battery and the timing duration.

[0091] According to another aspect of the embodiments of this application, an engine control system is also provided, which uses any of the engine control methods described above.

[0092] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes any of the above-described engine control methods.

[0093] Optionally, in this embodiment, the computer-readable storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any communication device in a group of communication devices.

[0094] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the current operating state of the engine and the current oil temperature of the engine oil; if it is determined that there is a potential heating demand for the engine based on the operating state, determining the start heating temperature threshold and the stop heating temperature threshold of the heating device based on the operating state, wherein the start heating temperature threshold is lower than the stop heating temperature threshold; if the current oil temperature is lower than the start heating temperature threshold, controlling the heating device to heat the oil using the electrical energy supplied by the power battery until the engine oil temperature reaches the stop heating temperature threshold, so that the water content of the oil is lower than a preset water content threshold.

[0095] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the running state is a stopped state, if it is determined that the vehicle's operating parameters meet the engine's starting conditions, and / or, if it is determined that the oil temperature change rate within a predetermined time after the engine enters the stopped state reaches a preset change rate threshold, then it is determined that the engine currently has a potential heating requirement; when the running state is a started state, the current required torque of the engine is obtained, and if the current required torque does not reach a preset torque threshold, it is determined that the engine currently has a potential heating requirement.

[0096] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the current operating speed of the vehicle, and determining that the operating parameters meet the engine starting conditions when the operating speed reaches a preset speed threshold; obtaining the current remaining battery power of the vehicle, and determining that the operating parameters meet the engine starting conditions when the remaining battery power is lower than a preset battery power threshold; obtaining the current driving power of the vehicle, and determining that the operating parameters meet the engine starting conditions when the driving power reaches a preset power threshold.

[0097] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the running state is a shutdown state, obtaining the first current charge of the power battery; determining the minimum starting oil temperature corresponding to the first current charge in the first preset mapping relationship as the starting heating temperature threshold and the starting target oil temperature as the stopping heating temperature threshold, wherein the first preset mapping relationship is used to record the mapping relationship between the charge of the power battery and the starting oil temperature, and the starting oil temperature includes the minimum starting oil temperature and the starting target oil temperature.

[0098] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the running state is the start state, obtaining the second current charge of the power battery; determining the minimum operating oil temperature corresponding to the second current charge and the current required torque of the engine in the second preset mapping relationship as the start heating temperature threshold and the target operating oil temperature as the stop heating temperature threshold, wherein the second preset mapping relationship is used to record the mapping relationship between the charge of the power battery, the required torque and the operating oil temperature, and the operating oil temperature includes the minimum operating oil temperature and the target operating oil temperature.

[0099] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the running state is in the start state, if a stop command for the engine is received, the current motor speed of the motor is obtained; when the motor speed reaches a first speed threshold, the clutch between the motor and the engine is controlled to engage, so that the engine enters an idling state driven by the motor, wherein the heat generated by the engine in the idling state is used to reduce the water content in the engine oil; the engine speed in the idling state is obtained according to a predetermined time period; after determining that the engine has been running at an engine speed not lower than a second speed threshold for a predetermined time period, the engine is controlled to enter a stop state based on the stop command.

[0100] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the third current charge of the power battery; determining the timing duration corresponding to the current oil temperature and the third current charge in the third preset mapping relationship as a predetermined timing duration, wherein the third preset mapping relationship is used to record the mapping relationship between the oil temperature, the charge of the power battery and the timing duration.

[0101] According to another aspect of the embodiments of this application, a processor is also provided, which is used to run a program, wherein the program executes any of the above-described engine control methods during runtime.

[0102] According to another aspect of the embodiments of this application, a computer program product is also provided, including computer instructions, which, when executed by a processor, perform any of the above-described engine control methods.

[0103] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0104] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0105] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0106] 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.

[0107] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0108] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0109] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0110] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for controlling an engine, applied to a P2 parallel hybrid power system, the P2 parallel hybrid power system comprising an engine, an electric motor, a motor controller, a clutch, a gearbox, and a power battery, wherein the clutch is located between the engine and the electric motor, characterized in that, A heating device is installed outside the oil pan of the engine. The heating device is connected to the vehicle's power battery and includes: Obtain the current operating status of the engine and the current oil temperature in the engine; If it is determined that the engine currently has a potential heating demand based on the operating status, the start heating temperature threshold and stop heating temperature threshold of the heating device are determined based on the operating status, wherein the start heating temperature threshold is lower than the stop heating temperature threshold; When the current oil temperature is lower than the starting heating temperature threshold, the heating device is controlled to use the electrical energy supplied by the power battery to heat the oil until the engine oil temperature reaches the stopping heating temperature threshold, so that the water content of the oil is lower than the preset water content threshold. The determination of the start-heating temperature threshold and stop-heating temperature threshold of the heating device based on the operating status includes: When the operating state is a shutdown state, the first current charge of the power battery is obtained; In the first preset mapping relationship, the minimum starting oil temperature corresponding to the first current charge is determined as the starting heating temperature threshold and the starting target oil temperature is determined as the stopping heating temperature threshold. The first preset mapping relationship is used to record the mapping relationship between the charge of the power battery and the starting oil temperature. The starting oil temperature includes the minimum starting oil temperature and the starting target oil temperature. When the operating state is the start-up state, the second current charge of the power battery is obtained; In the second preset mapping relationship, the minimum operating oil temperature corresponding to the second current charge and the current required torque of the engine is determined as the start heating temperature threshold and the target operating oil temperature is determined as the stop heating temperature threshold. The second preset mapping relationship is used to record the mapping relationship between the charge, required torque and operating oil temperature of the power battery. The operating oil temperature includes the minimum operating oil temperature and the target operating oil temperature.

2. The engine control method according to claim 1, characterized in that, Based on the operating status, it is determined that the engine currently has a potential heating requirement, including: When the operating state is a shutdown state, if it is determined that the operating parameters of the vehicle meet the starting conditions of the engine, and / or it is determined that the temperature change rate of the engine oil within a predetermined time after the engine enters the shutdown state reaches a preset change rate threshold, then it is determined that the engine currently has the potential heating requirement. When the operating state is the start state, the current required torque of the engine is obtained, and if the current required torque does not reach the preset torque threshold, it is determined that the engine currently has the potential heating requirement.

3. The engine control method according to claim 2, characterized in that, The operating parameters include at least one of the following: vehicle speed, remaining battery power, and drive power. Determining that the vehicle's operating parameters meet the engine's starting conditions includes at least one of the following: The vehicle's current operating speed is obtained, and if the operating speed reaches a preset speed threshold, the operating parameters are determined to meet the engine's starting conditions. The remaining battery power of the vehicle is obtained, and if the remaining battery power is lower than a preset battery power threshold, the operating parameters are determined to meet the engine starting conditions. The current driving power of the vehicle is obtained, and if the driving power reaches a preset power threshold, the operating parameters are determined to meet the engine starting conditions.

4. The engine control method according to claim 1, characterized in that, The method further includes: When the operating state is the start state, if a stop command for the engine is received, the current motor speed of the motor is obtained; When the motor speed reaches a first speed threshold, the clutch between the motor and the engine is engaged so that the engine enters an idling state driven by the motor. The heat generated by the engine in the idling state is used to reduce the water content in the engine oil. The engine speed of the engine in the idling state is obtained according to a predetermined time period; After determining that the engine has been running at a speed not lower than the second speed threshold for a predetermined time period, the engine is controlled to enter a shutdown state based on the shutdown command.

5. The engine control method according to claim 4, characterized in that, Determining that the engine operates at a speed not lower than a second speed threshold for a predetermined time duration includes: Obtain the third current charge level of the power battery; The time interval corresponding to the current oil temperature and the current charge in the third preset mapping relationship is determined as the predetermined time interval. The third preset mapping relationship is used to record the mapping relationship between the oil temperature, the charge of the power battery and the time interval.

6. An engine control device, employing the engine control method according to any one of claims 1 to 5, characterized in that, A heating device is installed outside the oil pan of the engine. The heating device is connected to the vehicle's power battery and includes: The first acquisition unit is used to acquire the current operating status of the engine and the current oil temperature of the engine oil. The determining unit is configured to determine, based on the operating state, a start heating temperature threshold and a stop heating temperature threshold of the heating device, wherein the start heating temperature threshold is lower than the stop heating temperature threshold, when it is determined that the engine currently has a potential heating demand based on the operating state. The control unit is configured to control the heating device to heat the engine oil using electrical energy supplied by the power battery when the current engine oil temperature is lower than the start heating temperature threshold, until the engine oil temperature reaches the stop heating temperature threshold, so that the water content of the engine oil is lower than the preset water content threshold.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein the program executes the engine control method according to any one of claims 1 to 5.

8. A computer program product comprising computer instructions, characterized in that, When the computer instructions are executed by the processor, the engine control method according to any one of claims 1 to 5 is performed.

Images