A control method for a hybrid vehicle, a power vehicle, and a storage medium

Abstract

The present application relates to the technical field of automobiles, and provides a control method for a hybrid vehicle, a power vehicle and a storage medium. The control method includes obtaining the oil temperature of the engine; when the oil temperature is not greater than a first preset value and the time interval since the last engine start is greater than a second preset value, the generator reversely drags the engine for a first duration to start the engine; when the oil temperature is not greater than the first preset value and the time interval since the last engine start is not greater than the second preset value, the generator reversely drags the engine for a second duration to start the engine, wherein the second duration is less than the first duration. The present application provides a control method for a hybrid vehicle, a power vehicle and a storage medium, which can improve the service life of the engine and enhance the driving experience.

Description

Technical Field

[0001] The present application relates to the technical field of automobiles, and particularly to a control method for a hybrid vehicle, a power vehicle and a storage medium. Background Art

[0002] In the related art, when the engine of a hybrid vehicle needs to be started during driving, the engine can be started by reverse-dragging the engine with the motor. At this time, if the engine is started quickly, the jitter during the engine start can be reduced, the driver's perception of the engine start can be reduced, and the driving experience can be improved. However, quickly starting the engine will cause a greater impact on the surfaces of friction pairs such as the bearing shells. Moreover, since it is the first start of the engine, there is no oil remaining in each oil passage position of the engine. Especially in a low-temperature environment, the high viscosity of the oil causes the oil to flow slowly. After the engine is started, it takes a long time for the oil to reach each oil passage position of the engine and establish oil pressure. Therefore, quickly starting often leads to premature damage of friction pairs such as the bearing shells. Summary of the Invention

[0003] In view of this, the embodiments of the present application are expected to provide a control method for a hybrid vehicle, a power vehicle and a storage medium to improve the service life of the engine and enhance the driving experience of users.

[0004] To achieve the above object, the technical solution of the embodiments of the present application is realized as follows:

[0005] On the one hand, an embodiment of the present application discloses a control method for a hybrid vehicle, including:

[0006] Obtaining the oil temperature of the engine;

[0007] When the oil temperature is not greater than a first preset value and the time interval since the last start of the engine is greater than a second preset value, the generator reverse-drags the engine for a first duration to start the engine;

[0008] When the oil temperature is not greater than the first preset value and the time interval since the last start of the engine is not greater than the second preset value, the generator reverse-drags the engine for a second duration to start the engine, where the second duration is less than the first duration.

[0009] In one embodiment, when the oil temperature is greater than the first preset value, the generator reverse-drags the engine for the second duration to start the engine.

[0010] In one embodiment, the control method includes:

[0011] Obtaining the real-time SOC of the power battery;

[0012] When the real-time state of charge (SOC) is not greater than the first threshold, start the engine to charge the power battery.

[0013] In one embodiment, after starting the engine to charge the power battery, the control method includes:

[0014] Determine that the power battery is charged until the current SOC reaches the second threshold, and stop the engine, where the second threshold is greater than the first threshold.

[0015] In one embodiment, the control method includes:

[0016] When the engine oil temperature is not greater than the first preset value, and the real-time SOC is greater than the first threshold and not greater than the third threshold, the generator drags the engine in reverse and keeps the engine speed not greater than the third preset value, where the third threshold is greater than the first threshold;

[0017] Start the positive temperature coefficient (PTC) to heat the engine oil.

[0018] In one embodiment, after starting the PTC to heat the engine oil, the control method includes:

[0019] Heat the engine oil to the target temperature, where the target temperature is greater than the first preset value;

[0020] When the real-time SOC is not greater than the first threshold, the generator drags the engine in reverse for the second duration to start the engine to charge the power battery.

[0021] In one embodiment, starting the PTC to heat the engine oil includes:

[0022] Connect the cooling pipeline of the warm air system and the engine oil cooler through the warm air valve, and start the PTC of the warm air system to heat the cooling pipeline to heat the engine oil.

[0023] In one embodiment, the control method includes:

[0024] When the hybrid vehicle is in the first start or driving state, the engine is used to charge the power battery.

[0025] In one embodiment, the control method includes:

[0026] Start the engine to assist in driving the wheels.

[0027] In one embodiment, the first duration is between 0.2 s and 0.3 s.

[0028] In one embodiment, the second duration is between 0 s and 0.1 s.

[0029] In one embodiment, the second preset value is between 25 min and 35 min.

[0030] Another aspect of the embodiments of the present application discloses a power vehicle, including a processor and a memory. The memory is used to store one or more programs. When the one or more programs are executed by the processor, the processor implements the control method of the hybrid vehicle in any one of the above embodiments.

[0031] Another aspect of the embodiments of the present application discloses a storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the control method of the hybrid vehicle in any one of the above embodiments.

[0032] The embodiments of the present application disclose a control method for a hybrid vehicle, a power vehicle, and a storage medium. By obtaining the oil temperature of the engine, when the oil temperature is not greater than the first preset value, by judging the magnitude relationship between the time interval since the last start of the engine and the second preset value, the start duration of the engine is selected. In this way, when starting the engine for the first duration, the impact on friction pairs such as the engine's bearing shells can be reduced, and the engine life can be improved; when starting the engine for the second duration, the engine vibration can be reduced, the engine responds quickly, and the driving experience of the user can be enhanced. Description of the Drawings

[0033] Figure 1 It is a schematic flowchart of a control method for a hybrid vehicle provided by an embodiment of the present application;

[0034] Figure 2 It is a schematic structural diagram of a hybrid engine provided by another embodiment of the present application.

[0035] Description of the Reference Numerals

[0036] Hybrid engine 100; Generator 1; Generator drive shaft 1a; Engine 2; Engine oil sump 2a; Crankshaft 2b; Oil pump 3; Oil cooler 4; Engine cooling system 5; Warm air system 6; Warm air valve 7; Suction pipe 8; Temperature sensor 9; Engine outlet pipe 10; Engine-cooler outlet pipe 11; Engine main oil passage 12; Engine-cooler inlet pipe 13; Engine-cooler return pipe 14; Warm air return pipe 15; Warm air inlet pipe 16. Detailed Embodiments

[0037] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. The detailed description in the specific embodiments should be understood as an explanatory description of the purpose of the present application and should not be regarded as an improper limitation to the present application.

[0038] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The descriptions such as "first" and "second" in the embodiments of the present application are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] The present application provides a control method for a hybrid vehicle. Please refer to Figure 1 , the control method includes:

[0040] S1. Obtain the engine oil temperature.

[0041] Exemplarily, a temperature sensor 9 can be arranged in the engine main oil passage 12 or the engine oil pan 2a, so that the engine oil temperature of the engine 2 can be obtained in real time.

[0042] S2. When the engine oil temperature is not greater than a first preset value and the time interval since the last engine start is greater than a second preset value, the generator drags the engine in reverse for a first duration to start the engine.

[0043] Exemplarily, the first preset value is not limited. For example, the first preset value can be -10°C. The time interval since the last start of the engine 2 can be judged by the engine 2 controller (Engine control unit, ECU). It should be noted that when the time interval since the last start of the engine 2 is greater than the second preset value, it means that there is less engine oil residue in the oil passage of the engine 2 and the engine oil temperature is low and the viscosity is high. After the engine 2 is started, the engine oil flows slowly. At this time, by dragging the engine 2 in reverse by the generator 1 for the first duration and then starting the engine 2, it can ensure that the impact on the friction pairs such as the engine bearings of the engine 2 is small and the service life of the engine 2 is improved.

[0044] S3. When the engine oil temperature is not greater than the first preset value and the time interval since the last engine start is not greater than the second preset value, the generator drags the engine in reverse for a second duration to start the engine, where the second duration is less than the first duration.

[0045] In this way, the engine vibration can be reduced and the driving experience can be improved.

[0046] It should be noted that if the engine 2 is directly dragged in reverse at high speed, when there is no engine oil remaining in the engine oil passage of the engine 2 and the friction pairs are not lubricated by engine oil, when the engine 2 suddenly receives the intervention of the high speed and high torque of the generator 1, the impact on the friction pairs such as the engine bearings of the engine 2 will be very large, which may cause damage to the friction pairs such as the bearings.

[0047] In this embodiment, by obtaining the oil temperature of the engine 2, when the oil temperature is not greater than the first preset value, by judging the magnitude relationship between the time interval since the last start of the engine 2 and the second preset value, the starting duration of the engine 2 is selected. In this way, when starting the engine 2 with the first duration, the impact on friction pairs such as the engine 2's bearing shells can be reduced, and the service life of the engine 2 can be improved; when starting the engine 2 with the second duration, the engine 2's jitter can be reduced, the engine 2 responds quickly, and the user's driving experience can be enhanced.

[0048] In one embodiment, the first duration is between 0.2 s and 0.3 s. Exemplarily, the first duration can be 0.2 s. In this way, when the generator 1 drags the engine 2 in reverse to start the engine 2 for the first duration, the friction pairs such as the bearing shells of the engine 2 can be protected, and the service life of the engine 2 can be improved.

[0049] In one embodiment, the second duration is between 0 s and 0.1 s. Exemplarily, the second duration can be 0.1 s. In this way, the jitter of the engine 2 can be reduced, and the user's driving experience is good.

[0050] In one embodiment, the second preset value is between 25 min and 35 min. Exemplarily, the second preset value can be 30 min. In this way, it indicates that the interval time since the last start of the engine 2 is relatively short, and there is more oil residue in the oil passages of the engine 2. The engine 2 can be started with the second duration, the jitter of the engine 2 can be reduced, the driving experience can be enhanced, and the heating time of the oil can be reduced. The user's waiting time is short, and the experience is good.

[0051] In one embodiment, S2': when the oil temperature is greater than the first preset value, the generator drags the engine in reverse to the second duration to start the engine.

[0052] Exemplarily, when the oil temperature is greater than -10 °C, the viscosity of the oil at this time is relatively low, the flow rate of the oil is relatively fast, and the engine 2 can quickly establish oil pressure at each oil passage position of the engine 2. In this way, when starting the engine 2 with the second duration, the jitter of the engine 2 can be reduced, and the driving experience can be enhanced.

[0053] In one embodiment, the control method includes: S4, obtaining the real-time SOC of the power battery.

[0054] Exemplarily, the SOC of the battery can be obtained in real time through the battery management system (BMS).

[0055] S5, when the real-time SOC is not greater than the first threshold, start the engine to charge the power battery.

[0056] Exemplarily, the first threshold is not limited. For example, the first threshold may be 15%. Thus, when the real-time SOC of the power battery is less than the first threshold, the engine 2 may drive the generator 1 to charge the power battery, thereby reducing the hybrid vehicle's running at low power and reducing the fuel consumption of the hybrid vehicle.

[0057] In one embodiment, after starting the engine to charge the power battery, the control method includes:

[0058] S6. Determine that the power battery is charged until the current SOC reaches a second threshold, and stop the engine, wherein the second threshold is greater than the first threshold.

[0059] For example, the second threshold value is not limited, for example, the second threshold value may be 25%. It should be noted that charging the power battery to the second threshold value is to prevent frequent starting of the engine 2, because frequent starting of the engine 2 will result in a short oil heating time, resulting in low oil temperature, high oil viscosity, and high friction work of the engine 2, which will increase the fuel consumption of the engine 2. When starting the engine 2, while charging the power battery, the oil in the oil channel is continuously heated, and the heating time is longer, which can reduce the viscosity of the oil, thereby reducing the fuel consumption of the hybrid engine 2 and providing a good lubrication environment for the next start of the engine 2.

[0060] In one embodiment, the control method includes: S7, when the engine oil temperature is not greater than a first preset value, and the real-time SOC is greater than the first threshold and not greater than the third threshold, the generator reversely drags the engine and maintains the engine speed not greater than a third preset value, wherein the third threshold is greater than the first threshold;

[0061] For example, the third threshold is not limited, for example, the third threshold can be 18%. The third preset value can be 200 rpm to 400 rpm. Thus, when the real-time SCO of the power battery is greater than the first threshold but not greater than the third threshold, it can be determined that the power battery has sufficient charge, and the hybrid vehicle maintains pure electric operation. Then, by controlling the speed of the engine 2 to be below the third preset value, the oil can be circulated in the oil channel, so that when the oil is subsequently heated, the heating is more uniform and the oil is retained throughout the oil channel.

[0062] It can be understood that the generator 1 reverses the engine 2 and keeps the engine speed no greater than the third preset value means that the generator 1 only reverses the engine 2, and the engine 2 itself is not started.

[0063] S8. Start the PTC to heat the engine oil.

[0064] In this way, by using PTC to heat the engine oil of engine 2, the heating efficiency is high.

[0065] In one embodiment, after starting the PTC to heat the engine oil, the control method includes:

[0066] S9. Heat the engine oil to a target temperature, where the target temperature is greater than the first preset value.

[0067] Exemplarily, the value of the target temperature is not limited. For example, the target temperature can be 20°C. It should be noted that heating the engine oil temperature to the target temperature is to make the viscosity of the engine oil low enough to ensure a relatively large oil flow rate and a relatively low pumping power of the oil pump 3. In this way, the frictional work of engine 2 can be reduced and the fuel consumption of engine 2 can be reduced.

[0068] It can be understood that starting the PTC to heat the engine oil consumes the power of the power battery, and the setting of the third threshold is to ensure that the engine oil temperature has been heated to the target temperature before the real-time SOC drops from the third threshold to the first threshold.

[0069] S10. When the real-time SOC is not greater than the first threshold, the generator drags the engine in reverse for the second duration to start the engine and charge the power battery.

[0070] In this way, when the real-time SOC of the power battery drops to less than or equal to the first threshold, since the engine oil temperature in the oil passage has risen to the target temperature and the residual amount of the engine oil in the oil passage is relatively large, the generator 1 can drag the engine 2 in reverse for the second duration to quickly start the engine 2. On the one hand, the jitter of the engine 2 can be reduced and the driving experience can be improved; on the other hand, since the engine oil temperature is high and the residual amount of the engine oil in the oil passage is large, the lubrication effect of the engine oil can be improved and the fuel consumption of the engine 2 can be reduced.

[0071] In one embodiment, starting the PTC to heat the engine oil of the engine includes:

[0072] S11. Conduct the cooling pipeline of the warm air system and the engine oil cooler through the warm air valve, and start the PTC of the warm air system to heat the cooling pipeline to heat the engine oil.

[0073] Exemplarily, the warm air valve 7 can be opened to conduct the warm air system 6 and the engine cooling system 5, and the PTC heats the cooling water. The heated cooling water flows through the engine cooling system 5 through the cooling pipeline and then enters the engine oil cooler 4. The engine oil can exchange heat with the heated cooling water in the engine oil cooler 4. In this way, when the generator 1 drags the engine 2 in reverse to start for the second duration, the jitter of the engine 2 can be reduced, the driving experience of the user can be improved, and the fuel consumption of the engine 2 can be reduced.

[0074] In one embodiment, the control method includes: S12. When the hybrid vehicle is in the first startup or driving state, the engine is used to charge the power battery.

[0075] Exemplarily, the first startup can use the ON gear signal of the key as the startup instruction. After receiving the ON gear signal of the key, the hybrid vehicle is in the first startup. The driving state means that the driving speed of the hybrid vehicle on the road surface is greater than 0. In this way, when the real-time SOC of the power battery is less than or equal to the first threshold, it is determined that the power of the power battery is insufficient. At this time, the engine 2 can be started to drive the generator 1 to rotate to charge the power battery, reducing the driving of the hybrid vehicle under power shortage and reducing the fuel consumption of the engine 2.

[0076] In one embodiment, the control method includes: S13. Start the engine to assist in driving the wheels.

[0077] Exemplarily, it can be when the acceleration of the hybrid vehicle reaches the fourth preset value and the power of the motor and the power battery reach the set conditions. For example, when the discharge power of the power battery and / or the power torque of the drive motor can no longer meet the requirements of the hybrid vehicle during driving, such as when the hybrid vehicle is in rapid acceleration or climbing, etc., the engine 2 can be started to assist in driving the wheels or the engine 2 can be started to drive the generator 1 to generate electricity to supply the drive motor.

[0078] Another embodiment of the present application provides a hybrid engine that can implement the control method of the hybrid vehicle provided in any one of the above embodiments. Please refer to Figure 2 , the hybrid engine 100 includes a generator 1, an engine 2, an oil pump 3, an oil cooler 4, an engine cooling system 5, a warm air system 6, a warm air valve 7, an oil suction pipe 8, a temperature sensor 9, an engine oil outlet pipe 10, a cooler oil outlet pipe 11, an engine main oil passage 12, a cooler water inlet pipe 13, a cooler water return pipe 14, a warm air return pipe 15, and a warm air inlet pipe 16. The generator 1 is rotationally connected to the engine 2. For example, the generator drive shaft 1a of the generator 1 can be connected to the crankshaft 2b of the engine 2 through a coupling. One end of the oil suction pipe 8 is connected to the mechanical pump, and the other end of the oil suction pipe 8 is connected to the bottom of the engine oil sump 2a. The crankshaft 2b drives the oil pump 3 to suck the engine oil in the engine oil sump 2a. The oil pump 3 is connected to the oil cooler 4 through the engine oil outlet pipe 10, and the oil cooler 4 is connected to the engine main oil passage 12 through the cooler oil outlet pipe 11. The temperature sensor 9 can be arranged in the engine main oil passage 12 or at the bottom of the engine oil sump 2a to monitor the size of the engine oil temperature.

[0079] The engine oil cooler 4 can be connected to the engine cooling system 5 through the engine-cooling inlet pipe 13 and the engine-cooling return pipe 14. The engine cooling system 5 can be connected to the heating system 6 through the heating return pipe 15 and the heating inlet pipe 16. A heating valve 7 can be provided on the heating inlet pipe 16, and the heating system 6 is equipped with a PTC heater. When the heating valve 7 is opened, the PTC heats the cooling water. The heated cooling water enters the engine oil cooler 4 through the engine cooling system 5. The engine oil can exchange heat with the heated cooling water in the engine oil cooler 4 and then enter the engine main oil gallery 12 through the engine-cooling outlet pipe 11.

[0080] For the hybrid engine 100 provided in this application, by setting the temperature sensor 9, the engine oil temperature can be obtained in real time. Through the heating system 6 and the engine oil cooler 4, the engine oil temperature can be heated to the target temperature. In this way, when the generator 1 drags the engine 2 to start for the second duration, the vibration of the engine 2 can be reduced, the driving experience of the user can be improved, and the fuel consumption of the engine 2 can be reduced.

[0081] Another embodiment of this application provides a power vehicle, which includes a processor and a memory. The memory is used to store one or more programs. When the one or more programs are executed by the processor, the processor implements the control method of the hybrid vehicle in any of the above embodiments.

[0082] Another embodiment of this application provides a storage medium, on which a computer program is stored. When the program is executed by the processor, it implements the control method of the hybrid vehicle in any of the above embodiments.

[0083] As described above, the above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. within the spirit and principle of this application are all included in the protection scope of this application.

Claims

1. A control method for a hybrid vehicle, characterized in that include: Get the engine oil temperature and the real-time SOC of the power battery; When the oil temperature is not greater than a first preset value and the time interval from the last start of the engine is greater than a second preset value, the generator reverses the engine for a first time period to start the engine; When the engine oil temperature is not greater than the first preset value and the time interval from the last engine start is not greater than the second preset value, the generator reverses the engine for a second time period to start the engine, wherein the second time period is less than the first time period; When the engine oil temperature is not greater than a first preset value and the real-time SOC is greater than a first threshold and not greater than a third threshold, the generator reverses the engine and maintains the engine speed at not greater than a third preset value, wherein the third threshold is greater than the first threshold; The PCT is started to heat the engine oil, wherein the PCT is started by consuming the power of the power battery, so that the oil temperature is heated to a target temperature before the real-time SOC drops from the third threshold to the first threshold, and the target temperature is greater than the first preset value.

2. The control method according to claim 1, wherein When the oil temperature is greater than the first preset value, the generator reverses the engine to the second time period to start the engine.

3. The control method according to claim 1 or 2, characterized in that The control method comprises: When the real-time SOC is not greater than the first threshold, the engine is started to charge the power battery.

4. The control method according to claim 3, characterized in that After starting the engine to charge the power battery, the control method includes: It is determined that the power battery is charged until the current SOC reaches a second threshold, and the engine is stopped, wherein the second threshold is greater than the first threshold.

5. The control method according to claim 1, characterized in that After starting the PTC to heat the engine oil, the control method includes: When the real-time SOC is not greater than the first threshold, the generator reverses the engine to the second time period to start the engine to charge the power battery.

6. The control method according to claim 1, characterized in that Activating the PTC to heat the engine oil includes: The cooling pipeline of the heating system and the oil cooler are connected through the heating valve, and the PTC of the heating system is started to heat the cooling pipeline to heat the oil of the engine.

7. The control method according to claim 3, characterized in that, The control method comprises: When the hybrid electric vehicle is in the initial start-up or driving state, the engine is used to charge the power battery.

8. The control method according to claim 1 or 2, characterized in that The control method comprises: The engine is started to assist in driving the wheels.

9. The control method according to claim 1, wherein The first duration is between 0.2s and 0.3s.

10. The control method according to claim 1, characterized in that, The second duration is between 0s and 0.1s.

11. The control method according to claim 1, wherein The second preset value is between 25 minutes and 35 minutes.

12. A power vehicle, characterized in that, The method comprises a processor and a memory, wherein the memory is used to store one or more programs. When the one or more programs are executed by the processor, the processor implements the control method of the hybrid vehicle according to any one of claims 1 to 11.

13. A storage medium, on which a computer program is stored, characterized in that, When the program is executed by a processor, the control method of the hybrid vehicle according to any one of claims 1 to 11 is implemented.

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