Power mode switching method and vehicle

Abstract

The invention discloses a power mode switching method and device and a vehicle, and belongs to the technical field of hybrid power control. Comprising the steps that a first vehicle speed interval is determined based on a target rotating speed interval, and the first vehicle speed interval is a vehicle speed interval corresponding to the non-efficient working rotating speed of an engine; under the condition that the target vehicle is currently in the direct-drive first-gear mode and the current vehicle speed of the target vehicle is in the first vehicle speed interval, the target vehicle is controlled to be switched from the direct-drive first-gear mode to the series connection mode; and under the condition that the current vehicle speed exceeds the maximum vehicle speed of the first vehicle speed interval, the target vehicle is controlled to be switched from the series connection mode to the direct-drive second-gear mode. Thus, in the vehicle speed interval corresponding to the non-efficient working rotation speed interval of the engine, the vehicle can be controlled to be switched from the direct-drive first-gear mode to the series-connection mode to run, so that the engine can be prevented from working at low efficiency, and the power performance under the working condition is improved through response of the driving motor under the series-connection mode; therefore, the power performance of the whole vehicle can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hybrid control, and in particular to a power mode switching method and a vehicle. BACKGROUND

[0002] In a hybrid vehicle or an electric vehicle, the power system of the vehicle has fixed mode switching logic. For a two-gear DHT (Dedicated Hybrid Transmission) power system architecture, it includes an electric mode, a series mode, a direct drive first gear mode and a direct drive second gear mode.

[0003] In the related art, when the vehicle is in a low power state and has a low speed, the vehicle is usually set to travel in the series mode. When the vehicle has a medium speed, the vehicle can be switched from the series mode to the direct drive first gear mode for travel. When the vehicle has a high speed, the vehicle can be switched from the direct drive first gear mode to the direct drive second gear mode for travel.

[0004] Since the direct drive first gear mode and the direct drive second gear mode require the engine to participate in power output, when the direct drive first gear mode is exited and the direct drive second gear mode is just entered, the engine speed is just in the speed range corresponding to the low-efficiency working condition, so that the engine working condition is poor, thereby causing the engine to be unable to efficiently output power when the direct drive first gear mode is exited and the direct drive second gear mode is just entered, and further reducing the vehicle power performance and further affecting the driving experience. SUMMARY

[0005] The present application provides a power mode switching method, device, vehicle and storage medium, which can control the vehicle to be switched from the direct drive first gear mode to the series mode for travel in a vehicle speed range corresponding to a non-high-efficiency working speed range of an engine, so that the engine can be prevented from working in a low-efficiency state, and the power performance in this working condition can be improved through the response of the driving motor in the series mode, thereby ensuring the vehicle power performance. The technical solution includes the following contents.

[0006] In a first aspect, a power mode switching method is provided, and the method includes the following steps. determining a first vehicle speed range based on a target speed range, the target speed range being a high-efficiency working speed range of an engine of a target vehicle, and the first vehicle speed range being a vehicle speed range corresponding to a non-high-efficiency working speed range of the engine; controlling the target vehicle to be switched from the direct drive first gear mode to the series mode and travel in the series mode when the target vehicle is currently in the direct drive first gear mode and a current vehicle speed of the target vehicle is in the first vehicle speed range; In a case that the current vehicle speed exceeds a maximum vehicle speed of the first vehicle speed interval, the target vehicle is controlled to switch from the series mode to a direct drive second gear mode, and travels in the direct drive second gear mode.

[0007] In the present application, a first vehicle speed interval is determined based on a target speed interval, so that a vehicle speed interval corresponding to a non-efficient working speed of the engine can be determined based on the efficient working speed interval of the engine, that is, a vehicle speed interval in which the target vehicle is possibly located when the engine cannot efficiently output power. When the target vehicle travels in the direct drive first gear mode, if the current vehicle speed of the target vehicle reaches a vehicle speed of the first vehicle speed interval, the target vehicle is controlled to switch from the direct drive first gear mode to the series mode and travel in the series mode, and then the target vehicle is controlled to switch to the direct drive second gear mode when the current vehicle speed exceeds a maximum vehicle speed of the first vehicle speed interval. In this way, by controlling the target vehicle to switch from the direct drive first gear mode to the series mode and travel in the series mode within the first vehicle speed interval corresponding to the non-efficient working speed of the engine, the target vehicle is prevented from switching to the direct drive second gear mode within the first vehicle speed interval, so that the engine can work in a low efficiency, and the power performance in this working condition can be improved by the response of the driving motor in the series mode. Moreover, the target vehicle is controlled to switch to the direct drive second gear mode only after the vehicle speed exceeds the first vehicle speed interval, and the engine speed matched with the vehicle speed after the first vehicle speed interval is in the efficient working speed interval, so that the engine can output power with high efficiency, and the whole switching process from the direct drive first gear mode to the direct drive second gear mode can ensure the power performance of the vehicle, thereby improving the driving experience.

[0008] Optionally, the controlling the target vehicle to switch from the direct drive first gear mode to the series mode in a case that the target vehicle currently travels in the direct drive first gear mode and the current vehicle speed of the target vehicle is in the first vehicle speed interval comprises: controlling the target vehicle to switch from the direct drive first gear mode to the series mode in a case that the current vehicle speed of the target vehicle reaches a first vehicle speed threshold and a current throttle opening is in a first opening interval; and the controlling the target vehicle to switch from the series mode to the direct drive second gear mode in a case that the current vehicle speed is greater than a maximum vehicle speed of the first vehicle speed interval comprises: controlling the target vehicle to switch from the series mode to the direct drive second gear mode in a case that the current vehicle speed of the target vehicle rises and exceeds a second vehicle speed threshold and the current throttle opening is in the first opening interval, the second vehicle speed threshold being greater than the first vehicle speed threshold, and a vehicle speed interval constituted by the first vehicle speed threshold and the second vehicle speed threshold being the first vehicle speed interval.

[0009] In the above method, since the throttle opening is relatively small, it indicates that the driver's power demand is not high, and the drive motor is sufficient to meet the driver's power needs. Therefore, to avoid inefficient engine operation, the target vehicle can be controlled to switch from direct drive first gear mode to series mode. In series mode, the drive motor responds to power demands, thereby optimizing energy utilization efficiency. Furthermore, when the target vehicle's current speed increases and exceeds the second speed threshold, it indicates that the current speed has entered the speed range corresponding to the target vehicle in direct drive second gear mode, and is within the speed range where the engine can efficiently output power in direct drive second gear mode. Therefore, in this case, controlling the target vehicle to switch from series mode to direct drive second gear mode can fully utilize the engine's efficient operation, thereby improving energy utilization while maintaining overall vehicle power performance. Thus, the entire switching process from direct drive first gear mode to direct drive second gear mode ensures overall vehicle power performance, thereby improving the driving experience.

[0010] Optionally, when the target vehicle is currently in direct drive first gear mode and the current speed of the target vehicle is within the first speed range, controlling the target vehicle to switch from direct drive first gear mode to series mode includes: When the target vehicle is in the direct drive first gear mode, if the current speed of the target vehicle reaches the first speed threshold, and the difference between the current speed and the first speed threshold is greater than or equal to a preset speed difference and remains for a preset time, and the current throttle opening is in the first opening range, the target vehicle is controlled to switch from the direct drive first gear mode to the serial mode. And when the current vehicle speed exceeds the maximum speed in the first speed range, controlling the target vehicle to switch from the series mode to the direct drive second-gear mode includes: When the current speed of the target vehicle increases and exceeds the second speed threshold, and the difference between the current speed and the second speed threshold is the preset speed difference and is maintained for the preset duration, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from the serial mode to the direct drive second gear mode.

[0011] In the above method, the power mode is switched only after the difference between the current vehicle speed and the first vehicle speed threshold is greater than or equal to the preset vehicle speed difference and is maintained for a preset time. This can avoid the situation where the target vehicle switches to the series mode as soon as its current speed is in the speed range, but then switches to the power mode again when the current speed is not in the speed range after switching to the series mode. This can avoid the unstable power output caused by frequent switching of power modes. Based on the same principle, it can also avoid frequent switching between the series mode and the direct drive second gear mode.

[0012] Optionally, the method further includes: If the current battery level of the target vehicle is less than or equal to a preset battery level threshold, and if the target vehicle is currently in series mode and the current vehicle speed reaches a third vehicle speed threshold, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from series mode to direct drive first gear mode. The third vehicle speed threshold is less than the first vehicle speed threshold, and the engine speed corresponding to the speed range formed by the third vehicle speed threshold and the first vehicle speed threshold is within the target speed range. If the current battery level of the target vehicle is greater than the preset battery level threshold, and if the target vehicle is currently in pure electric mode and the current vehicle speed reaches the third vehicle speed threshold, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from the pure electric mode to the direct drive first gear mode.

[0013] In the above method, if the current vehicle speed reaches the third vehicle speed threshold, it means that the current vehicle speed of the target vehicle is in the speed range where the engine works efficiently in direct drive first gear mode. Therefore, after the target vehicle switches to direct drive first gear mode, the engine can output power efficiently. In this case, by switching the target vehicle from series mode / pure electric mode to direct drive first gear mode, the engine can output power efficiently, thereby ensuring the overall vehicle power performance while improving energy utilization.

[0014] Optionally, the method further includes: If the current battery level of the target vehicle is less than or equal to the preset battery level threshold, and if the target vehicle is currently in series mode and the current vehicle speed reaches the fourth vehicle speed threshold, and the current throttle opening is in the second opening range, control the target vehicle to switch from series mode to direct drive first gear mode. The fourth vehicle speed threshold is less than the third vehicle speed threshold, and the throttle opening included in the second opening range is greater than the throttle opening included in the first opening range. If the current battery level of the target vehicle is greater than the preset battery level threshold, and if the target vehicle is currently in pure electric mode and the current vehicle speed reaches the fourth vehicle speed threshold, and the current throttle opening is within the second opening range, the target vehicle is controlled to switch from pure electric mode to direct drive first gear mode.

[0015] In the above scenario, where the target vehicle is currently traveling at a low speed in series / pure electric mode, and the current speed has reached the fourth speed threshold, but the throttle opening is relatively large—a low-speed, high-throttle condition—the driver typically requires rapid acceleration. In this situation, by switching the target vehicle from series / pure electric mode to direct-drive first gear mode when the current speed reaches the fourth speed threshold and the throttle opening is in the second range, the vehicle can meet the driver's acceleration needs under low-speed, high-throttle conditions, thereby improving the driving experience.

[0016] Optionally, the method further includes: If the target vehicle's current battery level is less than or equal to the preset battery level threshold, and if the target vehicle is currently in series mode and the current vehicle speed is greater than or equal to the fifth vehicle speed threshold and less than the fourth vehicle speed threshold, and the current throttle opening is in the third opening range, control the target vehicle to switch from series mode to direct drive first gear mode, where the fifth vehicle speed threshold is less than the fourth vehicle speed threshold, and the throttle opening included in the third opening range is greater than the throttle opening included in the second opening range; If the target vehicle's current battery level is greater than the preset battery level threshold, and if the target vehicle is currently in pure electric mode and its current speed is greater than or equal to the fifth speed threshold and less than the fourth speed threshold, and the current throttle opening is within the third opening range, the target vehicle is controlled to switch from pure electric mode to direct drive first gear mode.

[0017] In the above method, when the driver has a very large acceleration demand when the target vehicle is about to start or has just started, the target vehicle is controlled to switch from series mode / pure electric mode to direct drive first gear mode. This can ensure the power demand of the whole vehicle, so that the target vehicle can meet the driver's acceleration demand when starting and under high throttle conditions, thereby improving the driving experience.

[0018] Optionally, the method further includes: When the target vehicle is in the direct drive second gear mode, if the current speed of the target vehicle drops to the sixth speed threshold and the current throttle opening is in the fourth opening range, then the target vehicle is controlled to switch from the direct drive second gear mode to the series mode. The sixth speed threshold is less than the second speed threshold, and the difference between the second speed threshold and the sixth speed threshold is a preset speed difference. If the current speed of the target vehicle drops to the seventh speed threshold and the current throttle opening is in the fourth opening range, then the target vehicle is controlled to switch from the serial mode to the direct drive first gear mode. The sixth speed threshold is greater than the seventh speed threshold, the seventh speed threshold is less than the first speed threshold, and the difference between the first speed threshold and the seventh speed threshold is a preset speed difference.

[0019] In the above method, since the second speed threshold is the minimum speed required to enter direct-drive second-gear mode, the method involves controlling the target vehicle to switch from direct-drive second-gear mode to series mode when the current speed drops below the second speed threshold and is less than the second speed threshold by a preset speed difference. If the target vehicle's current speed further decreases to the seventh speed threshold, it can then switch from series mode to direct-drive first-gear mode. This is equivalent to gradually switching the target vehicle from direct-drive second-gear mode to direct-drive first-gear mode by first switching to series mode while the target vehicle is coasting or decelerating, thus achieving a smoother deceleration during the transition from direct-drive second-gear to direct-drive first-gear mode.

[0020] Optionally, the method further includes: If the current battery level of the target vehicle is greater than the preset battery level threshold, and the current speed of the target vehicle drops to the sixth speed threshold, and the current throttle opening is the target opening, then the target vehicle is controlled to switch from the direct drive second-gear mode to the pure electric mode. When the current speed of the target vehicle drops to the seventh speed threshold and the current throttle opening is the target opening, the power mode of the target vehicle is controlled to remain unchanged in the pure electric mode.

[0021] The above method assumes the target vehicle is operating with a high battery charge. This method is equivalent to the driver not pressing the accelerator pedal to decelerate, and once the target vehicle's current speed drops to the sixth speed threshold, the vehicle is directly switched from direct drive second gear mode to pure electric mode. Since the driver does not press the accelerator pedal afterward, no power output is required during the entire deceleration process, and therefore no engine is needed to participate in power output. Thus, the vehicle can continue to operate in pure electric mode during subsequent deceleration, thereby maximizing energy savings.

[0022] Optionally, determining the first vehicle speed range based on the target rotational speed range includes: Based on the target speed range, at least one second vehicle speed range is determined, wherein the at least one second vehicle speed range is the vehicle speed range corresponding to the engine's efficient operating speed. The first speed range is determined based on the at least one second speed range.

[0023] Secondly, a power mode switching device is provided, the device comprising: The determination module is used to determine a first vehicle speed range based on a target speed range, wherein the target speed range is the high-efficiency operating speed range of the engine of the target vehicle, and the first vehicle speed range is the vehicle speed range corresponding to the low-efficiency operating speed of the engine. The first switching module is used to control the target vehicle to switch from the direct drive first gear mode to the series mode when the target vehicle is currently in the direct drive first gear mode and the current speed of the target vehicle is within the first speed range, and to drive in the series mode. The second switching module is used to control the target vehicle to switch from the serial mode to the direct drive second gear mode when the current vehicle speed exceeds the maximum vehicle speed in the first vehicle speed range, and to drive in the direct drive second gear mode.

[0024] Optionally, the first switching module is used to: When the target vehicle is in the direct drive first gear mode, if the current speed of the target vehicle reaches the first speed threshold and the current throttle opening is in the first opening range, the target vehicle is controlled to switch from the direct drive first gear mode to the serial mode. And, the second switching module is used for: When the current speed of the target vehicle increases and exceeds the second speed threshold, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from the serial mode to the direct drive second-gear mode. The second speed threshold is greater than the first speed threshold, and the speed range formed by the first speed threshold and the second speed threshold is the first speed range.

[0025] Optionally, the first switching module is further configured to: When the target vehicle is in the direct drive first gear mode, if the current speed of the target vehicle reaches the first speed threshold, and the difference between the current speed and the first speed threshold is greater than or equal to a preset speed difference and remains for a preset time, and the current throttle opening is in the first opening range, the target vehicle is controlled to switch from the direct drive first gear mode to the serial mode. The second switching module is also used for: When the current speed of the target vehicle increases and exceeds the second speed threshold, and the difference between the current speed and the second speed threshold is the preset speed difference and is maintained for the preset duration, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from the serial mode to the direct drive second gear mode.

[0026] Optionally, the device further includes: The third switching module is used to control the target vehicle to switch from the series mode to the direct drive first gear mode when the current battery level of the target vehicle is less than or equal to a preset battery level threshold, and the target vehicle is currently in series mode, the current vehicle speed reaches a third vehicle speed threshold, and the current throttle opening is within the first opening range. The third vehicle speed threshold is less than the first vehicle speed threshold, and the engine speed corresponding to the speed range formed by the third vehicle speed threshold and the first vehicle speed threshold is within the target speed range. When the current battery level of the target vehicle is greater than the preset battery level threshold, and the target vehicle is currently in pure electric mode, the current vehicle speed reaches the third vehicle speed threshold, and the current throttle opening is within the first opening range, the module controls the target vehicle to switch from the pure electric mode to the direct drive first gear mode.

[0027] Optionally, the device further includes: The fourth switching module is used to control the target vehicle to switch from the series mode to the direct drive first gear mode when the current battery level of the target vehicle is less than or equal to the preset battery level threshold, and the target vehicle is currently in series mode, the current vehicle speed reaches the fourth vehicle speed threshold, and the current throttle opening is in the second opening range. The fourth vehicle speed threshold is less than the third vehicle speed threshold, and the throttle opening included in the second opening range is greater than the throttle opening included in the first opening range. When the current battery level of the target vehicle is greater than the preset battery level threshold, if the target vehicle is currently in pure electric mode, the current vehicle speed reaches the fourth vehicle speed threshold, and the current throttle opening is in the second opening range, the module controls the target vehicle to switch from the pure electric mode to the direct drive first gear mode.

[0028] Optionally, the device further includes: The fifth switching module is used to control the target vehicle to switch from the series mode to the direct drive first gear mode when the target vehicle's current battery level is less than or equal to the preset battery level threshold, and the target vehicle is currently in series mode, the current vehicle speed is greater than or equal to the fifth vehicle speed threshold and less than the fourth vehicle speed threshold, and the current throttle opening is in the third opening range. The fifth vehicle speed threshold is less than the fourth vehicle speed threshold, and the throttle opening included in the third opening range is greater than the throttle opening included in the second opening range. Alternatively, if the target vehicle's current battery level is greater than the preset battery level threshold, and the target vehicle is currently in pure electric mode, the current vehicle speed is greater than or equal to the fifth vehicle speed threshold and less than the fourth vehicle speed threshold, and the current throttle opening is in the third opening range, the module controls the target vehicle to switch from the pure electric mode to the direct drive first gear mode.

[0029] Optionally, the device further includes: The sixth switching module is used to control the target vehicle to switch from the direct drive second gear mode to the series mode when the target vehicle is in the direct drive second gear mode. If the current speed of the target vehicle drops to the sixth speed threshold and the current throttle opening is in the fourth opening range, the sixth speed threshold is less than the second speed threshold and the difference between the second speed threshold and the sixth speed threshold is a preset speed difference. The seventh switching module is used to control the target vehicle to switch from the serial mode to the direct drive first gear mode if the current speed of the target vehicle drops to the seventh speed threshold and the current throttle opening is in the fourth opening range. The sixth speed threshold is greater than the seventh speed threshold, the seventh speed threshold is less than the first speed threshold, and the difference between the first speed threshold and the seventh speed threshold is a preset speed difference value.

[0030] Optionally, the device further includes: The eighth switching module is used to control the target vehicle to switch from the direct drive second-gear mode to pure electric mode when the current battery level of the target vehicle is greater than the preset battery level threshold, and the current vehicle speed drops to the sixth vehicle speed threshold and the current throttle opening is the target opening; and when the current vehicle speed drops to the seventh vehicle speed threshold and the current throttle opening is the target opening, control the target vehicle to maintain the pure electric mode.

[0031] Optionally, the determining module is used to: Based on the target speed range, at least one second vehicle speed range is determined, wherein the at least one second vehicle speed range is the vehicle speed range corresponding to the engine's efficient operating speed. The first speed range is determined based on the at least one second speed range.

[0032] Thirdly, a vehicle is provided, the vehicle comprising: Memory, used to store executable program code; A processor is configured to call and run the executable program code from the memory, causing the vehicle to perform the aforementioned power mode switching method.

[0033] Fourthly, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described power mode switching method.

[0034] Fifthly, a computer program product containing instructions is provided, which, when run on a computer, causes the computer to perform the steps of the power mode switching method described above.

[0035] It is understood that the beneficial effects of the second, third, fourth, and fifth aspects mentioned above can be found in the relevant descriptions in the first aspect above, and will not be repeated here. Attached Figure Description

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

[0037] Figure 1 This is a schematic diagram of the powertrain architecture of a hybrid vehicle provided in an embodiment of this application; Figure 2 This is a flowchart of a power mode switching method provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a power mode switching device provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0039] It should be understood that "multiple" as mentioned in this application refers to two or more. In the description of this application, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, to facilitate a clear description of the technical solutions of this application, the terms "first," "second," etc., are used to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and that "first," "second," etc., do not necessarily imply differences.

[0040] First, the powertrain architecture of the hybrid vehicle involved in the embodiments of this application will be described.

[0041] For example, Figure 1 This is a schematic diagram of the powertrain architecture of a hybrid vehicle provided in an embodiment of this application. This embodiment of the application involves a two-stage DHT powertrain architecture, such as... Figure 1 The diagram shows the structure of a two-speed DHT powertrain system with a P2+P4 configuration. It should be noted that the power mode switching method provided in this application can be applied to a two-speed AMT (Automated Mechanical Transmission) system, such as a two-speed powertrain system based on a P1+P3 or P2+P4 configuration. This application only uses the P2+P4 configuration as an example to illustrate the powertrain system structure involved in this application.

[0042] See Figure 1 , Figure 1 It may include an engine 101, a clutch 102, a front axle motor 103, a synchronizer 104, a power battery 105, and a rear axle motor 106.

[0043] Engine 101 can provide power output to the vehicle and also charge the power battery.

[0044] Clutch 102 is used to connect and disconnect the power output of engine 101 from the transmission system. Disengaging clutch 102 cuts off the power link between engine 101 and the transmission system, preventing engine 101 from participating in vehicle propulsion. Engaging clutch 102 transmits the output torque of engine 101, allowing engine 101 to participate in vehicle propulsion.

[0045] The front axle motor 103 provides power output and can drive the front wheels of the vehicle. It can work together with the engine 101 to drive the vehicle, or it can work together with the rear axle motor 106 to drive the vehicle.

[0046] Synchronizer 104 is used to switch gears. Synchronizer 104 is used to make the speed of the gears that are about to mesh at the input end and the output end quickly reach the same level, thereby avoiding the impact and noise caused by the speed difference and improving the smoothness of gear shifting.

[0047] The power battery 105 provides a power source for the front axle motor 103 and the rear axle motor 106, enabling them to operate and thus drive the vehicle. In some cases, the front axle motor 103 can also charge the power battery 105.

[0048] The rear axle motor 106 is the drive motor for the rear axle, used to drive the rear wheels of the vehicle. It can drive the rear wheels independently to propel the vehicle, or it can work together with the front axle motor 103 to output power and drive the vehicle.

[0049] The above Figure 1 The powertrain architecture shown can achieve multiple different operating modes, including pure electric mode (pure electric two-wheel drive mode, pure electric four-wheel drive mode), series mode, and direct drive four-wheel drive mode (including direct drive first gear mode and direct drive second gear mode). The working process of pure electric mode, series mode, direct drive first gear mode, and direct drive second gear mode are explained below.

[0050] 1. Pure Electric Mode In pure electric mode, the vehicle is driven by the rear axle motor 106 alone or by the front axle motor 103 and the rear axle motor 106 together.

[0051] Specifically, when the vehicle is in pure electric two-wheel drive mode, the power battery 105 provides power to the rear axle motor 106, which is in operation and provides power output to drive the rear wheels and thus propel the vehicle. In addition, in pure electric two-wheel drive mode, the engine 101 and the front axle motor 103 are not operating, meaning they do not provide power output.

[0052] When the vehicle is in pure electric four-wheel drive mode, the power battery 105 provides power to both the front axle motor 103 and the rear axle motor 106. Both the front axle motor 103 and the rear axle motor 106 are in operation. The front axle motor 103 outputs power to drive the front wheels, and the rear axle motor 106 outputs power to drive the rear wheels. In other words, the vehicle is driven by both the front axle motor 103 and the rear axle motor 106.

[0053] 2. Series mode When the vehicle is in series mode, the engine 101 is operational, driving the front axle motor 103 to generate electricity to charge the power battery 105. The power battery 105 then supplies power to the rear axle motor 106, which in turn provides power to drive the rear wheels, thus propelling the vehicle. Furthermore, the synchronizer sleeve is in the middle position, not engaging with the gears on either side; that is, the synchronizer is in neutral.

[0054] 3. Direct drive first gear mode When the vehicle is in direct-drive four-wheel drive mode, clutch 102 is engaged, and engine 101 connects directly to the transmission via clutch 102, then transmits power to the drive shaft, ultimately driving the wheels to rotate. Alternatively, while the engine is running, the front axle motor 103 can also rotate, but it does not output power; that is, the front axle motor 103 does not participate in driving. In both modes, the power output from engine 101 is directly transmitted via mechanical transmission, bypassing the front axle motor 103.

[0055] When the vehicle is in direct drive first gear mode, the synchronizer 104's sleeve engages with the left gear, which corresponds to first gear. This engages the transmission, and the engine 101 establishes a power link with the transmission via the clutch 102, allowing power to be transmitted to the drive shaft and ultimately to the wheels. Furthermore, the power battery 105 can supply power to the rear axle motor 106, which then provides power output for assist or energy recovery.

[0056] 4. Direct drive second-speed mode When the vehicle is in direct drive second gear mode, the synchronizer 104's gear sleeve engages with the right gear, which corresponds to second gear. This engages the transmission in second gear, and the engine 101 establishes a power link with the transmission via the clutch 102, allowing engine power to be transmitted to the drive shaft and ultimately to the wheels. Furthermore, the power battery 105 can supply power to the rear axle motor 106, which then provides power output for assist or energy recovery.

[0057] The application scenarios of the embodiments of this application are described below.

[0058] Regarding the above Figure 1 The two-speed DHT powertrain architecture shown includes pure electric mode, series mode, direct drive first gear mode, and direct drive second gear mode. Generally, when the vehicle's battery level is low, the system can switch between these modes based on vehicle speed. When the battery level is high, the system can switch between these modes based on vehicle speed.

[0059] For example, when the vehicle's battery is low, if the vehicle speed is below 40 km / h, the vehicle can be controlled to operate in series mode. When the vehicle speed is between 40 km / h and 70 km / h, the vehicle can be controlled to operate in direct drive mode (first gear). When the vehicle speed is above 70 km / h, the vehicle can be controlled to operate in direct drive mode (second gear). When the vehicle's battery is high, if the vehicle speed is below 40 km / h, the vehicle can be controlled to operate in pure electric mode. When the vehicle speed is between 40 km / h and 70 km / h, the vehicle can be controlled to operate in direct drive mode (first gear). When the vehicle speed is above 70 km / h, the vehicle can be controlled to operate in direct drive mode (second gear).

[0060] Because both direct-drive first and second gear modes require engine participation in power output, the engine's boundary conditions are relatively poor in these modes. For example, in direct-drive first and second gear modes, the engine speed is between 1000-2500 rpm, while the efficient operating speed is around 1800 rpm. At these boundary speeds, the engine cannot operate efficiently. However, when the engine operates at around 1800 rpm, the corresponding vehicle speed range is [50, 60] and (80, 120]. In other words, in direct-drive first gear mode, the engine can efficiently output power when the vehicle speed is within the [50, 60) speed range, and in direct-drive second gear mode, the engine can efficiently output power when the vehicle speed is within the (80, 120) speed range. Outside of these speed ranges, the engine speed cannot reach around 1800 rpm, thus preventing the engine from outputting power efficiently.

[0061] However, in the above method, the vehicle is switched from direct drive first gear mode to direct drive second gear mode when the vehicle speed reaches 70km / h. 70km / h is exactly on the boundary between the speed range corresponding to direct drive first gear mode and direct drive second gear mode, and is not within the speed range corresponding to the efficient operating speed range. During this process, the engine speed is exactly in the inefficient operating speed range. Therefore, the engine cannot efficiently output power when exiting direct drive first gear mode and when entering direct drive second gear mode. Consequently, the overall power performance of the vehicle cannot be guaranteed when switching from direct drive first gear mode to direct drive second gear mode, which further affects the driving experience.

[0062] Furthermore, after entering direct drive second gear mode, the engine speed can reach around 1800 rpm for a period of time, allowing the engine to output power efficiently. This can result in less smooth power delivery during direct drive second gear mode, with sudden changes in power output. Under complex operating conditions, these sudden changes in power output can lead to system vibration or instability, thus affecting vehicle comfort and safety.

[0063] Therefore, this application provides a power mode switching method, which can be applied to the power mode switching process of the above-mentioned two-speed DHT power system.

[0064] Specifically, the vehicle speed range corresponding to the engine's inefficient operating speeds can be determined first, based on the engine's efficient operating speed range. Then, during the vehicle's operation, the power mode can be switched based on this speed range. Specifically, if the target vehicle is in direct-drive first gear mode and its current speed is within this speed range, the vehicle can be controlled to switch from direct-drive first gear mode to series mode and operate in series mode. If the current speed exceeds the maximum speed within this range, the vehicle can then be controlled to switch from series mode to direct-drive second gear mode and operate in direct-drive second gear mode.

[0065] Thus, by controlling the target vehicle to switch from direct drive first gear mode to series mode within the vehicle speed range corresponding to the engine's inefficient operating speed, the vehicle is prevented from switching to direct drive second gear mode within this speed range. This avoids the engine operating at low efficiency, instead improving power performance under this condition through the response of the drive motor in series mode. Furthermore, the vehicle only switches to direct drive second gear mode after the current speed exceeds this speed range. Since the engine speed matched to the speed exceeding this range is within the efficient operating speed range, the engine can output power efficiently. Therefore, the overall vehicle power performance can be guaranteed throughout the entire switching process from direct drive first gear mode to direct drive second gear mode, thereby improving driving performance.

[0066] As an example, based on the target vehicle's engine's efficient operating speed range, the vehicle speed range corresponding to the engine's inefficient operating speeds can be determined as [60, 80]. Therefore, when the target vehicle is currently in direct drive first gear mode and the current speed is within this speed range [60, 80], for example, at 65 km / h, the target vehicle can be controlled to first switch from direct drive first gear mode to series mode. Then, when the current speed exceeds 80 km / h, the target vehicle can be controlled to switch from series mode to direct drive second gear mode.

[0067] In this situation, when the engine speed cannot reach the efficient operating speed range, by controlling the target vehicle not to directly switch to the direct drive second gear mode, but to switch to the series mode first, the target vehicle can drive in the series mode within the speed range [60,80]. This can avoid the engine from outputting power inefficiently. By driving the motor in the series mode to respond to the vehicle's power demand, the overall vehicle power performance can be guaranteed.

[0068] The power mode switching method provided in the embodiments of this application will be explained in detail below.

[0069] Figure 2 This is a flowchart illustrating a power mode switching method provided in an embodiment of this application. This method can be applied to the vehicle's HCU (Hybrid Control Unit). See also... Figure 2 The method includes the following steps 201-203.

[0070] Step 201: Based on the target speed range, determine the first vehicle speed range. The target speed range is the high-efficiency operating speed range of the engine of the target vehicle, and the first vehicle speed range is the vehicle speed range corresponding to the low-efficiency operating speed of the engine.

[0071] The efficient operating speed range refers to the speed range within which the engine of the target vehicle can operate efficiently. Generally, when the engine speed is within the efficient operating speed range, the engine's thermal efficiency is the highest and fuel consumption is the lowest, maximizing fuel efficiency and outputting a large amount of energy with minimal fuel consumption, thus achieving efficient power output. In this embodiment, the efficient operating speed range can be the speed range within which the engine of the target vehicle can operate efficiently in direct drive first gear mode or direct drive second gear mode. For example, in direct drive first gear mode or direct drive second gear mode, the efficient operating speed of the engine is around 1800 rpm, then the efficient operating speed range can be [1500, 2200].

[0072] Inefficient operating speeds are those that prevent the engine from operating efficiently. In this embodiment, engine speeds outside the efficient operating speed range can be considered as inefficient operating speeds.

[0073] Since the engine cannot output power efficiently at inefficient operating speeds, by using the target speed range, we can determine the corresponding vehicle speed ranges at these inefficient operating speeds. In other words, we can identify at which vehicle speeds the engine cannot output power efficiently. This allows us to set targeted processing strategies to improve the overall vehicle power performance at these speeds.

[0074] One possible approach is that step 201 can be: determining at least one second vehicle speed range based on the target speed range; and determining a first vehicle speed range based on the at least one second vehicle speed range.

[0075] The at least one second speed range refers to the speed range corresponding to the engine's efficient operating speed, that is, the vehicle speed range corresponding to when the engine speed reaches the efficient operating speed range. Furthermore, the at least one second speed range includes the speed range within which the engine operates efficiently in direct drive first gear mode and direct drive second gear mode. For example, when the target vehicle is in direct drive first gear mode and direct drive second gear mode, the efficient operating speed of the target vehicle is approximately 1800 rpm, and the corresponding speed range within which the engine operates efficiently in direct drive first gear mode and direct drive second gear mode can be [50, 60) and (80, 120).

[0076] After determining the at least one second speed range, which may include discontinuous speed values ​​not included in the second speed range, the speed range formed by the discontinuous speed values ​​not included in the second speed range can be determined as the first speed range. For example, between the second speed ranges [50, 60) and (80, 120], [60, 80] is not included in the range, so [60, 80] can be determined as the first speed range.

[0077] Furthermore, after determining the first vehicle speed range, the corresponding power mode switching strategy can be adjusted based on the first vehicle speed range to avoid the engine working at a lower efficiency as much as possible. That is, the following steps 202 and 203 can continue to be executed.

[0078] Step 202: When the target vehicle is currently in direct drive first gear mode and the current speed of the target vehicle is within the first speed range, control the target vehicle to switch from direct drive first gear mode to series mode and drive in series mode.

[0079] In the above method, if the target vehicle is currently in direct drive first gear mode and the current speed is within the first speed range, it indicates that the target vehicle is at the speed boundary between the corresponding speed range of direct drive first gear and direct drive second gear modes. At this time, the engine cannot work efficiently, and therefore, the engine cannot respond to power demands in a timely manner. In this situation, by controlling the target vehicle to switch from direct drive first gear mode to series mode, the engine can be prevented from operating at low efficiency. Instead, the response of the drive motor in series mode can improve the power performance under this condition, thereby ensuring the overall power performance of the target vehicle at this time.

[0080] One possible approach is that step 202 can be performed as follows: when the target vehicle is in direct drive first gear mode, if the current speed of the target vehicle reaches the first speed threshold and the current throttle opening is within the first opening range, control the target vehicle to switch from direct drive first gear mode to series mode.

[0081] The first speed threshold is the minimum speed in the first speed range, for example, the first speed threshold can be 60km / h.

[0082] The current throttle opening indicates the driver's current driving needs. The first opening range can be preset, and it can be set relatively small so that the target vehicle switches from direct drive first gear mode to series mode under low throttle conditions. For example, the first opening range can be [25%, 40%].

[0083] Since the throttle opening is small, it indicates that the driver's power demand is not high, and the drive motor is sufficient to meet the driver's power needs. Therefore, in this situation, to avoid inefficient engine operation, the target vehicle can be switched from direct drive first gear mode to series mode. In series mode, the drive motor responds to the power demand, thereby optimizing energy utilization efficiency.

[0084] Furthermore, the above method is equivalent to controlling the target vehicle to switch power modes by combining the real-time operating conditions of the target vehicle and the real-time driving needs of the driver. In this way, the power mode switching can match the driver's driving needs and conform to the real-time operating conditions of the target vehicle.

[0085] In some embodiments, step 202 may also be performed as follows: when the target vehicle is in direct drive first gear mode, if the current vehicle speed reaches a first vehicle speed threshold, and the difference between the current vehicle speed and the first vehicle speed threshold is greater than or equal to a preset vehicle speed difference and remains for a preset time, and the current throttle opening is in the first opening range, then control the target vehicle to switch from direct drive first gear mode to serial mode.

[0086] The preset speed difference and preset duration can both be set by technicians. For example, the preset speed difference can be set to 5 km / h and the preset duration can be set to 2 seconds.

[0087] In this situation, the target vehicle is currently operating within a speed range where the engine cannot operate efficiently, and the current speed is already greater than the preset speed difference for the minimum speed within that range—meaning it's exceeding the speed limit by a certain amount. This exceeding speed has been maintained for a preset duration, indicating that a power mode switch is necessary. Therefore, switching the power mode only after the difference between the current speed and the first speed threshold is greater than or equal to the preset speed difference and remains at that level for a preset duration avoids the situation where the target vehicle switches to series mode as soon as its current speed enters the range, but then switches to series mode again when its current speed is outside the range, causing the target vehicle to switch power modes again. This prevents unstable power output caused by frequent power mode switching.

[0088] For example, if the first vehicle speed range is [60, 80], then the first vehicle speed threshold is 60 km / h. If the target vehicle is currently in direct drive first gear mode, and the current vehicle speed is 65 km / h, the difference between the current vehicle speed and the first vehicle speed threshold is 5 km / h, the current vehicle speed has been at 65 km / h for 2 seconds, and the current throttle opening is 30%, then the target vehicle can be controlled to switch from direct drive first gear mode to series mode.

[0089] It is worth noting that, in this embodiment, when the current vehicle speed is within the first speed range, the target vehicle can be controlled to switch from direct drive first gear mode to series mode. When the current vehicle speed is less than the minimum speed of the first speed range, the target vehicle continues to drive in direct drive first gear mode. Furthermore, when the target vehicle has a low battery level and a low speed, it is generally driven in series mode. For example, when the vehicle battery is low, it can start in series mode and then, under certain conditions, switch from series mode to direct drive first gear mode.

[0090] The following explains the power switching strategy when the target vehicle is in a low battery state and driving at low speed, which is mainly implemented in the following three situations.

[0091] In the first scenario, if the target vehicle's current battery level is less than or equal to a preset battery level threshold, and if the target vehicle is currently in series mode and its current speed reaches the third speed threshold, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from series mode to direct drive first gear mode.

[0092] Specifically, the third vehicle speed threshold is lower than the first vehicle speed threshold, and the engine speed corresponding to the speed range formed by the third and first vehicle speed thresholds is within the target speed range, that is, within the engine's efficient operating speed range. In particular, the speed range formed by the third and first vehicle speed thresholds can be the speed range within which the engine operates efficiently in direct drive first gear mode; for example, if this speed range is [50, 60], then the third vehicle speed threshold can be 50 km / h.

[0093] In the above method, if the current vehicle speed reaches the third vehicle speed threshold, it means that the current vehicle speed of the target vehicle is in the speed range where the engine works efficiently in direct drive first gear mode. Therefore, after the target vehicle switches to direct drive first gear mode, the engine can output power efficiently. In this case, by switching the target vehicle from series mode to direct drive first gear mode, the engine can output power efficiently, thereby improving energy utilization while ensuring the overall vehicle power performance.

[0094] In some embodiments, if the target vehicle's current battery level is less than or equal to a preset battery level threshold, and if the target vehicle is currently in series mode and its current speed reaches a third speed threshold, and the difference between the current speed and the third speed threshold is greater than or equal to a preset speed difference for a preset duration, and the current throttle opening is within a first opening range, then the target vehicle is controlled to switch from series mode to direct drive first gear mode.

[0095] In this situation, the target vehicle is already within the speed range where the engine can operate efficiently in direct drive first gear mode, and the current speed is already greater than the preset speed difference of the minimum speed within this range. This means the speed has been exceeding the preset speed for a set duration, indicating that a power mode switch is necessary. This avoids unstable power output caused by frequent power mode switching.

[0096] For example, if the target vehicle is currently driving in series and the current throttle opening is in the first opening range, the speed range corresponding to the direct drive first gear mode can be set to [50, 60). Then, if the target vehicle's current speed is 55 km / h and continues for a preset duration, it can switch from series mode to direct drive first gear mode.

[0097] In the second scenario, if the target vehicle is currently in series mode and its current speed has reached the fourth speed threshold, and the current throttle opening is in the second opening range, control the target vehicle to switch from series mode to direct drive first gear mode.

[0098] The fourth speed threshold is lower than the third speed threshold. For example, the fourth speed threshold can be 30 km / h.

[0099] The throttle opening range included in the second opening range is greater than the throttle opening range included in the first opening range. For example, if the first opening range is set to [25%, 40%], then the second opening range can be set to (40%, 85%).

[0100] In the above scenario, where the target vehicle is currently traveling at a low speed in series mode, and the current speed has reached the fourth speed threshold, but the throttle opening is large, corresponding to a low speed, high throttle condition, the driver generally needs the vehicle to accelerate quickly. However, the response time for rapid acceleration in series mode is relatively long, so series mode can no longer meet the driver's power needs. Therefore, the engine should be engaged in power output. Although the current speed is not within the engine's efficient operating speed range in direct drive first gear mode, compared to series mode, the engine can still meet the driver's acceleration needs. Therefore, the target vehicle should be switched to direct drive first gear mode to meet the driver's driving needs.

[0101] In the above method, by controlling the target vehicle to switch from serial mode to direct drive first gear mode when the current vehicle speed reaches the fourth speed threshold and the current throttle opening is in the second opening range, the target vehicle can meet the driver's acceleration needs under low speed and high throttle conditions, thereby improving the driving experience.

[0102] It should be understood that the above situation can also be achieved through this operation: if the target vehicle is currently in series mode and the current speed reaches the fourth speed threshold, and the difference between the current speed and the fourth speed threshold is greater than or equal to a preset speed difference for a preset duration, and the current throttle opening is in the second opening range, control the target vehicle to switch from series mode to direct drive first gear mode. This avoids unstable power output caused by frequent switching of power modes.

[0103] For example, the second opening range is set to (40%, 85%), the fourth vehicle speed threshold can be set to 30km / h, the target vehicle is currently driving in series, then when the target vehicle's current speed is 35km / h and continues for a preset duration, and the current throttle opening is 60%, it can switch from series mode to direct drive first gear mode.

[0104] In the third scenario, if the target vehicle is currently in series mode and its current speed is greater than or equal to the fifth speed threshold and less than the fourth speed threshold, and the current throttle opening is in the third opening range, control the target vehicle to switch from series mode to direct drive first gear mode.

[0105] The fifth speed threshold can be preset and is lower than the fourth speed threshold. For example, the fifth speed threshold can be set to 0 km / h.

[0106] The throttle opening range included in the third opening range is greater than the throttle opening range included in the second opening range. For example, if the second opening range is (40%, 85%), then the third opening range can be set to (85%, 100%).

[0107] In the above situation, that is, when the target vehicle is about to start or has just started, the current throttle opening is large, which corresponds to the high throttle condition when starting. Under this condition, the driver generally needs the vehicle to start quickly, that is, the driver has a very large acceleration demand. However, the response time for rapid acceleration in series mode is relatively long, so series mode cannot meet the driver's power demand. Therefore, the engine should be involved in power output. Thus, the target vehicle should be switched to direct drive first gear mode to meet the driver's driving needs.

[0108] In the above method, when the driver has a very large acceleration demand when the target vehicle is about to start or has just started, the target vehicle is controlled to switch from series mode to direct drive first gear mode. This can ensure the power demand of the whole vehicle, so that the target vehicle can meet the driver's acceleration demand when starting and under high throttle conditions, thereby improving the driving experience.

[0109] For example, when the target vehicle is first started, it is in series driving mode and the current speed is 0, which means that the target vehicle has not yet started. At this time, when it is ready to start, with the current throttle opening at 90%, it can be directly switched from series mode to direct drive first gear mode to ensure the starting needs of the whole vehicle.

[0110] The above describes the power switching strategy when the target vehicle is in a low battery state and driving at low speed. The following describes the power switching strategy when the target vehicle is in a high battery state and driving at low speed. Similar to the power switching strategy when driving with a low battery, it is mainly implemented in the following three situations.

[0111] It should be noted that when the target vehicle has a high battery level and a low speed, the vehicle is generally driven in pure electric mode. For example, after the vehicle is started, it can be driven in pure electric mode first. Then, under certain conditions, the target vehicle can be controlled to switch from pure electric mode to direct drive mode. The specific strategy is as follows.

[0112] In the first scenario, if the target vehicle's current battery level is greater than the preset battery level threshold, and if the target vehicle is currently in pure electric mode and its current speed has reached the third speed threshold, and the current throttle opening is in the first opening range, the target vehicle will be switched from pure electric mode to direct drive first gear mode.

[0113] In the second scenario, if the target vehicle is currently in pure electric mode and its current speed has reached the fourth speed threshold, and the current throttle opening is in the second opening range, control the target vehicle to switch from pure electric mode to direct drive first gear mode.

[0114] In the third scenario, if the target vehicle is currently in pure electric mode and its current speed is greater than or equal to the fifth speed threshold and less than the fourth speed threshold, and the current throttle opening is in the third opening range, control the target vehicle to switch from pure electric mode to direct drive first gear mode.

[0115] It should be understood that the setting principle of the power mode switching strategy under high battery condition is the same as that under low battery condition. The only difference is that under low battery condition, the target vehicle starts in series mode by default, and then switches from series mode to direct drive first gear mode under certain conditions. Under high battery condition, the target vehicle starts in pure electric mode by default, and then switches from pure electric mode to direct drive first gear mode under similar conditions. To avoid redundancy, the above three situations under high battery condition will not be elaborated here.

[0116] The above explains the specific power mode switching strategies when the target vehicle is driving at low speed under low and high battery conditions. The following explains the specific power mode switching strategies when the target vehicle is driving at high speed under low and high battery conditions.

[0117] Step 203: When the current vehicle speed exceeds the maximum speed of the first speed range, control the target vehicle to switch from serial mode to direct drive second gear mode and drive in direct drive second gear mode.

[0118] In the above method, if the current vehicle speed exceeds the maximum speed of the first speed range, it indicates that the current speed is within the speed range corresponding to the efficient operating RPM range. This means that the engine can reach its efficient operating RPM under the current conditions, thus efficiently outputting power. At this point, it is possible to switch to direct drive second gear mode to continue driving the target vehicle. This ensures that the overall vehicle power performance is maintained throughout the entire switching process from direct drive first gear mode to direct drive second gear mode, thereby improving the driving experience.

[0119] One possible approach is to operate step 203 as follows: when the current speed of the target vehicle increases and exceeds the second speed threshold, and the current throttle opening is within the first opening range, control the target vehicle to switch from serial mode to direct drive second gear mode.

[0120] The second speed threshold is greater than the first speed threshold. The second speed threshold is the maximum speed within the first speed range; that is, the speed range formed by the first speed threshold and the second speed threshold is the first speed range. As an example, the second speed threshold can be 80 km / h.

[0121] In the above method, when the current speed of the target vehicle increases and exceeds the second speed threshold, it means that the current speed has entered the speed range corresponding to the target vehicle in direct drive second gear mode, and is within the speed range in which the engine can efficiently output power when the target vehicle is in direct drive second gear mode. In this case, by controlling the target vehicle to switch from series mode to direct drive second gear mode, the efficient working function of the engine can be fully utilized, thereby improving energy utilization while ensuring the overall vehicle power performance.

[0122] In some embodiments, step 202 may also be performed as follows: when the current speed of the target vehicle increases and exceeds the second speed threshold, and the difference between the current speed and the second speed threshold is a preset speed difference and is maintained for a preset duration, and the current throttle opening is in the first opening range, the target vehicle is controlled to switch from the serial mode to the direct drive second gear mode.

[0123] It should be understood that the second speed threshold is the maximum speed within the first speed range. Therefore, the second speed threshold can also be considered the minimum speed threshold within the second speed range (the RPM range corresponding to efficient engine operation) corresponding to the direct-drive second-gear mode. In this case, the target vehicle is already within the speed range where the engine can operate efficiently, and the current speed is greater than the preset speed difference of the minimum speed within that range—that is, it exceeds the speed limit by a certain amount. This excess speed condition has persisted for a preset duration, indicating that a power mode switch is necessary. Thus, switching to direct-drive second-gear mode only occurs after the difference between the current speed and the second speed threshold is the preset speed difference and remains so for a preset duration. This avoids the situation where the target vehicle switches to direct-drive second-gear mode as soon as its current speed exceeds the maximum speed of the first speed range, but then immediately falls below the maximum speed after switching to direct-drive second-gear mode, causing the target vehicle to switch power modes again. This avoids unstable power output caused by frequent power mode switching.

[0124] It should be understood that at higher speeds, the target vehicle generally will not operate in pure electric mode. Therefore, the power switching strategy in step 203 above applies to both high and low battery conditions.

[0125] Steps 202-203 above describe the power mode switching strategy for the target vehicle's acceleration under low battery and high battery conditions. Table 1 below shows the power mode switching strategy for the target vehicle under low battery conditions.

[0126] Table 1

[0127] The table above summarizes the power mode switching strategy under low battery conditions as follows: When the target vehicle is about to start, if the current throttle opening is small, it continues to drive in the default series mode. If the current throttle opening is large, the target vehicle switches from series mode to direct drive first gear mode. After the target vehicle starts, if it is driving in series mode, and the current speed exceeds the fourth speed threshold (30 km / h), for example, the current speed is 35 km / h, and the current throttle opening is large, the target vehicle switches from series mode to direct drive first gear mode. However, if the current throttle opening is small, it still drives in series mode. While the target vehicle continues to drive in series mode, as the vehicle speed gradually increases, if the current speed exceeds the third speed threshold (50 km / h), for example, the current speed is 55 km / h, the target vehicle can switch from series mode to direct drive first gear mode. If the target vehicle is currently traveling in direct drive first gear, and the current speed exceeds the third speed threshold while the throttle opening is relatively large, then the target vehicle will continue to travel in direct drive first gear. While the target vehicle is traveling in direct drive first gear, if the current speed exceeds the first speed threshold (e.g., 65 km / h) and the throttle opening is relatively small, the target vehicle can be switched from direct drive first gear to series mode. However, if the throttle opening is relatively large, the target vehicle can remain in direct drive first gear. Subsequently, while the target vehicle is traveling in series mode, if the current speed exceeds the second speed threshold (e.g., 85 km / h) and the throttle opening is not particularly large, the target vehicle can be switched from series mode to direct drive second gear. However, if the throttle opening is very large, the target vehicle will remain in direct drive first gear to ensure power output by downshifting. If the target vehicle continues to increase its speed while driving in direct drive second gear, then control the target vehicle to continue driving in direct drive second gear.

[0128] Table 2 below shows the power mode switching strategy for the target vehicle under high battery conditions.

[0129] Table 2

[0130] The table above summarizes the power mode switching strategy under high battery conditions as follows: When the target vehicle is about to start, if the current throttle opening is small, it continues to operate in the default pure electric mode. If the current throttle opening is large, the target vehicle switches from pure electric mode to direct drive first gear mode. After the target vehicle starts, if it is operating in pure electric mode, and the current speed exceeds the fourth speed threshold (30 km / h), for example, the current speed is 35 km / h, and the current throttle opening is large, the target vehicle switches from pure electric mode to direct drive first gear mode. However, if the current throttle opening is small, it remains in pure electric mode. While the target vehicle continues to operate in pure electric mode, as the vehicle speed gradually increases, if the current speed exceeds the third speed threshold (50 km / h), for example, the current speed is 55 km / h, the target vehicle can switch from pure electric mode to direct drive first gear mode. If the target vehicle is currently traveling in direct drive first gear, and the current speed exceeds the third speed threshold while the throttle opening is relatively large, then the target vehicle will continue to travel in direct drive first gear. While the target vehicle is traveling in direct drive first gear, if the current speed exceeds the first speed threshold (e.g., 65 km / h) and the throttle opening is relatively small, the target vehicle can be switched from direct drive first gear to series mode. However, if the throttle opening is relatively large, the target vehicle can remain in direct drive first gear. Subsequently, while the target vehicle is traveling in series mode, if the current speed exceeds the second speed threshold (e.g., 85 km / h) and the throttle opening is not particularly large, the target vehicle can be switched from series mode to direct drive second gear. However, if the throttle opening is very large, the target vehicle will remain in direct drive first gear to ensure power output by downshifting. If the target vehicle continues to increase its speed while driving in direct drive second gear, then control the target vehicle to continue driving in direct drive second gear.

[0131] The above describes the power mode switching strategy for the target vehicle accelerating under low and high battery conditions. In this embodiment, a power mode switching strategy for the target vehicle decelerating is also provided, which will be described in detail below.

[0132] If the target vehicle is in direct drive second gear mode, and the current speed of the target vehicle drops to the sixth speed threshold and the current throttle opening is in the fourth opening range, then the target vehicle is controlled to switch from direct drive second gear mode to series mode; if the current speed of the target vehicle drops to the seventh speed threshold and the current throttle opening is in the fourth opening range, then the target vehicle is controlled to switch from series mode to direct drive first gear mode.

[0133] Specifically, the sixth speed threshold is less than the second speed threshold, and the difference between the second speed threshold and the sixth speed threshold is a preset speed difference. Furthermore, the sixth speed threshold is greater than the seventh speed threshold, and the seventh speed threshold is less than the first speed threshold, and the difference between the first speed threshold and the seventh speed threshold is a preset speed difference.

[0134] The fourth opening range can be set to a smaller value. For example, the fourth opening range can be less than 25% of the throttle opening range (0, 25%). This indicates that the target vehicle is not currently accelerating or is decelerating, such as when it is driving slowly, or it may correspond to the driver gradually releasing the accelerator pedal to gradually decelerate.

[0135] Since the second speed threshold is the minimum speed required to enter direct-drive second-gear mode, in the above method, that is, after the current speed drops below the second speed threshold, and the current speed is less than the second speed threshold by a preset speed difference, the target vehicle is controlled to first switch from direct-drive second-gear mode to series mode. If the target vehicle's current speed further decreases to the seventh speed threshold, the target vehicle can then be controlled to switch from series mode to direct-drive first-gear mode. Thus, it's equivalent to gradually switching the target vehicle from direct-drive second-gear mode to direct-drive first-gear mode by switching to series mode while the target vehicle is coasting or decelerating, thereby achieving a smoother deceleration during the transition from direct-drive second-gear mode to direct-drive first-gear mode.

[0136] Furthermore, by switching the target vehicle from direct drive second gear mode to series mode when the target vehicle's current speed drops to the sixth speed threshold instead of the second speed threshold, and by switching the target vehicle from series mode to direct drive second gear mode when the target vehicle's current speed drops to the seventh speed threshold instead of the first speed threshold, the problem of frequent power mode switching caused by the target vehicle's power mode switching threshold is avoided, thus making the power output more stable.

[0137] It should be understood that the aforementioned power mode switching strategy during deceleration can be applied to both low battery and high battery operating conditions.

[0138] The above describes the power mode switching strategy when the target vehicle is moving forward or decelerating while the driver presses the accelerator pedal. Below is the power mode switching strategy when the driver is decelerating by pressing the brake pedal without pressing the accelerator pedal.

[0139] In the first scenario, if the target vehicle's current battery level is greater than the preset battery level threshold, and the target vehicle's current speed drops to the sixth speed threshold while the current throttle opening is the target opening, then the target vehicle will be switched from direct drive second-gear mode to pure electric mode. If the target vehicle's current speed drops to the seventh speed threshold while the current throttle opening is the target opening, then the target vehicle's power mode will remain unchanged in pure electric mode.

[0140] The target opening is the state where the accelerator pedal is not depressed, and the target opening can be 0%.

[0141] In this scenario, the target vehicle is operating with a high battery charge. The above method is equivalent to the driver not pressing the accelerator pedal to decelerate. Once the target vehicle's current speed drops to the sixth speed threshold, the vehicle is directly switched from direct drive second gear mode to pure electric mode. Since the driver does not press the accelerator pedal afterward, no power output is required during the entire deceleration process. Therefore, the engine does not need to participate in power output, and the vehicle can still operate in pure electric mode during subsequent deceleration, thus maximizing energy savings.

[0142] In the second scenario, if the target vehicle's current battery level is less than the preset battery level threshold, and the target vehicle's current speed drops to the sixth speed threshold while the current throttle opening is the target opening, then the target vehicle will be switched from direct drive second gear mode to series mode. If the target vehicle's current speed drops to the seventh speed threshold while the current throttle opening is the target opening, then the target vehicle's power mode will remain unchanged in series mode.

[0143] In this scenario, the target vehicle is traveling with a low battery. The above method is equivalent to the driver not pressing the accelerator pedal to decelerate. When the target vehicle's current speed first drops to the sixth speed threshold, because the target vehicle has a low battery, the vehicle is directly controlled to switch from direct drive second gear mode to series mode. Since the driver still does not press the accelerator pedal, no power output is required during the entire deceleration process. Therefore, the engine does not need to participate in power output, and the vehicle can still travel in series mode during subsequent deceleration, thus maximizing energy savings.

[0144] The above describes the power mode switching strategies for the target vehicle's deceleration under low and high battery conditions. Table 3 below shows the power mode switching strategies for the target vehicle's deceleration under low battery conditions.

[0145] Table 3

[0146] As shown in Table 3 above, under low battery conditions, during the gradual deceleration from high speed, if the driver does not press the accelerator pedal (i.e., the pedal opening is 0%), and the current speed drops outside the speed range of the direct drive second gear mode, the vehicle can directly switch from direct drive second gear mode to series mode, and continue driving in series mode during subsequent deceleration. However, if the driver presses the accelerator pedal, but the accelerator pedal opening is very small, and the current speed drops outside the speed range of the direct drive second gear mode (e.g., dropping to the sixth speed threshold of 75 km / h), the target vehicle can be controlled to switch from direct drive second gear mode to series mode. Subsequently, as the target vehicle continues to decelerate, it will drive in series mode until it reaches the seventh speed threshold (55 km / h), at which point the target vehicle can be controlled to switch from series mode to direct drive first gear mode. Afterwards, since the target vehicle is driving in series mode at low speeds with low battery, it will revert to series mode. In this situation, when the target vehicle reduces its speed to a certain level (e.g., 35 km / h), the target vehicle can be controlled to switch from direct drive first gear mode to series mode, and the series mode can be maintained during the subsequent deceleration process.

[0147] Table 4 below shows the power mode switching strategy for the target vehicle to decelerate under high battery conditions.

[0148] Table 4

[0149] As shown in Table 4 above, under high battery conditions, during the gradual deceleration from high speed, if the driver does not press the accelerator pedal (i.e., the pedal opening is 0%), and the current speed drops outside the speed range of the direct drive second gear mode, the vehicle can directly switch from direct drive second gear mode to pure electric mode, and continue driving in pure electric mode during subsequent deceleration. However, if the driver presses the accelerator pedal, but the accelerator pedal opening is very small, and the current speed drops outside the speed range of the direct drive second gear mode (e.g., dropping to the sixth speed threshold of 75 km / h), the target vehicle can be controlled to switch from direct drive second gear mode to series mode. Subsequently, as the target vehicle continues to decelerate, it travels in series mode until it reaches the seventh speed threshold (55 km / h), at which point the target vehicle can be controlled to switch from series mode to direct drive first gear mode. Afterwards, since the target vehicle is in pure electric mode when driving at low speeds with a high battery, it must return to pure electric mode. In this situation, when the target vehicle reduces its speed to a certain level (e.g., 35 km / h), the target vehicle can be controlled to switch from direct drive first gear mode to pure electric mode, and the pure electric mode can be maintained during the subsequent deceleration process.

[0150] It is worth noting that the pedal opening in Tables 1-4 above refers to the accelerator pedal opening, series refers to series mode, direct drive first gear refers to direct drive first gear mode, direct drive second gear refers to direct drive second gear mode, and pure electric refers to pure electric mode.

[0151] In addition, it should be noted that during deceleration, the accelerator pedal opening of the target vehicle is very small, or the accelerator pedal opening of the target vehicle is 0. If the accelerator pedal opening is large, it indicates that the driver has an acceleration demand. This is a power mode switching strategy under acceleration conditions. Therefore, Table 3 above shows the power mode switching strategy based on vehicle speed changes when the accelerator pedal opening is between 0-25%.

[0152] In this embodiment of the application, during the power mode switching process, the output torque can also be smoothed by filtering, so as to avoid sudden power changes during the power mode switching process.

[0153] One possible approach is to smooth the output torque during power mode switching using methods such as Kalman filtering or low-pass filtering. Of course, other filtering methods can also be used to smooth the output torque; this application does not limit this approach to a single method.

[0154] It is worth noting that the power mode switching method provided in this application determines the vehicle speed range corresponding to the engine's inefficient operating speed in direct drive first gear mode and direct drive second gear mode, and then adjusts the power mode switching strategy based on the vehicle speed range. This is equivalent to virtualizing the two-speed mode of the transmission into three-speed mode (direct drive first gear mode, series mode, and direct drive second gear mode), and adjusting the switching strategy of each power mode, thereby optimizing the power output and energy utilization efficiency of the target vehicle, and thus extending the vehicle's driving range.

[0155] In this embodiment, the HCU first determines a first vehicle speed range based on the target speed range. This allows the HCU to determine the vehicle speed range corresponding to the inefficient operating speeds based on the engine's efficient operating speed range. In other words, it determines the possible vehicle speed range where the target vehicle's speed might be when the engine cannot efficiently output power. Then, when the target vehicle is driving in direct drive first gear mode, if the target vehicle's current speed reaches the speed of the first speed range, the target vehicle can be controlled to switch from direct drive first gear mode to series mode and drive in series mode. Afterward, when the current speed exceeds the maximum speed of the first speed range, the target vehicle is controlled to switch to direct drive second gear mode. Thus, by controlling the target vehicle to switch from direct drive first gear mode to series mode within the first vehicle speed range corresponding to the engine's inefficient operating speed, the vehicle is prevented from switching to direct drive second gear mode within the first speed range. This avoids the engine operating at low efficiency, instead improving power performance under this condition through the response of the drive motor in series mode. Furthermore, the vehicle only switches to direct drive second gear mode after exceeding the first speed range. Since the engine speed matched with the vehicle speed after exceeding the first speed range is within the efficient operating speed range, the engine can output power efficiently. Therefore, the overall vehicle power performance can be guaranteed throughout the entire switching process from direct drive first gear mode to direct drive second gear mode, thereby improving the driving experience.

[0156] Figure 3 This is a schematic diagram of a power mode switching device provided in an embodiment of this application. This power mode switching device can be implemented as part or all of a vehicle by software, hardware, or a combination of both. The vehicle can be described below. Figure 4 The vehicle shown. See also Figure 3 The device includes: a determining module 301, a first switching module 302, and a second switching module 303.

[0157] The determining module 301 is used to determine a first vehicle speed range based on a target speed range, wherein the target speed range is the high-efficiency operating speed range of the engine of the target vehicle, and the first vehicle speed range is the vehicle speed range corresponding to the low-efficiency operating speed of the engine. The first switching module 302 is used to control the target vehicle to switch from direct drive first gear mode to series mode and drive in series mode when the target vehicle is currently in direct drive first gear mode and the current speed of the target vehicle is in the first speed range. The second switching module 303 is used to control the target vehicle to switch from serial mode to direct drive second gear mode when the current vehicle speed exceeds the maximum speed of the first vehicle speed range, and to drive in direct drive second gear mode.

[0158] Optionally, the first switching module 302 is used for: When the target vehicle is in direct drive first gear mode, if the current speed of the target vehicle reaches the first speed threshold and the current throttle opening is in the first opening range, control the target vehicle to switch from direct drive first gear mode to series mode. And, the second switching module 303 is used for: When the target vehicle's current speed increases and exceeds the second speed threshold, and the current throttle opening is within the first opening range, control the target vehicle to switch from serial mode to direct drive second gear mode. The second speed threshold is greater than the first speed threshold, and the speed range formed by the first speed threshold and the second speed threshold is the first speed range.

[0159] Optionally, the first switching module 302 is also used for: When the target vehicle is in direct drive first gear mode, if the current speed of the target vehicle reaches the first speed threshold, and the difference between the current speed and the first speed threshold is greater than or equal to the preset speed difference and remains for a preset time, and the current throttle opening is in the first opening range, control the target vehicle to switch from direct drive first gear mode to series mode. The second switching module 303 is also used for: When the target vehicle’s current speed increases and exceeds the second speed threshold, and the difference between the current speed and the second speed threshold is a preset speed difference and is maintained for a preset time, and the current throttle opening is in the first opening range, control the target vehicle to switch from serial mode to direct drive second gear mode.

[0160] Optionally, the device further includes: The third switching module is used to control the target vehicle to switch from series mode to direct drive first gear mode when the target vehicle's current battery level is less than or equal to a preset battery level threshold, and the target vehicle is currently in series mode, the current vehicle speed reaches the third vehicle speed threshold, and the current throttle opening is in the first opening range. The third vehicle speed threshold is less than the first vehicle speed threshold, and the engine speed corresponding to the speed range formed by the third vehicle speed threshold and the first vehicle speed threshold is in the target speed range. When the target vehicle's current battery level is greater than the preset battery level threshold, and the target vehicle is currently in pure electric mode, the current vehicle speed reaches the third vehicle speed threshold, and the current throttle opening is in the first opening range, the module controls the target vehicle to switch from pure electric mode to direct drive first gear mode.

[0161] Optionally, the device further includes: The fourth switching module is used to control the target vehicle to switch from series mode to direct drive first gear mode when the target vehicle's current battery level is less than or equal to a preset battery level threshold. If the target vehicle is currently in series mode and the current speed reaches the fourth speed threshold, and the current throttle opening is in the second opening range, the fourth speed threshold is less than the third speed threshold, and the throttle opening included in the second opening range is greater than the throttle opening included in the first opening range. If the target vehicle's current battery level is greater than a preset battery level threshold, and the target vehicle is currently in pure electric mode and the current speed reaches the fourth speed threshold, and the current throttle opening is in the second opening range, the module controls the target vehicle to switch from pure electric mode to direct drive first gear mode.

[0162] Optionally, the device further includes: The fifth switching module is used to control the target vehicle to switch from series mode to direct drive first gear mode when the target vehicle's current battery level is less than or equal to a preset battery level threshold. If the target vehicle is currently in series mode and its current speed is greater than or equal to the fifth speed threshold and less than the fourth speed threshold, and the current throttle opening is in the third opening range, the module controls the target vehicle to switch from series mode to direct drive first gear mode. The fifth speed threshold is less than the fourth speed threshold, and the throttle opening included in the third opening range is greater than the throttle opening included in the second opening range. If the target vehicle's current battery level is greater than a preset battery level threshold, and the target vehicle is currently in pure electric mode and its current speed is greater than or equal to the fifth speed threshold and less than the fourth speed threshold, and the current throttle opening is in the third opening range, the module controls the target vehicle to switch from pure electric mode to direct drive first gear mode.

[0163] Optionally, the device further includes: The sixth switching module is used to control the target vehicle to switch from direct drive second gear mode to series mode when the target vehicle is in direct drive second gear mode. If the current speed of the target vehicle drops to the sixth speed threshold and the current throttle opening is in the fourth opening range, the target vehicle is in direct drive second gear mode. The sixth speed threshold is less than the second speed threshold, and the difference between the second speed threshold and the sixth speed threshold is a preset speed difference. The seventh switching module is used to control the target vehicle to switch from serial mode to direct drive first gear mode if the current speed of the target vehicle drops to the seventh speed threshold and the current throttle opening is in the fourth opening range. The sixth speed threshold is greater than the seventh speed threshold, the seventh speed threshold is less than the first speed threshold, and the difference between the first speed threshold and the seventh speed threshold is a preset speed difference value.

[0164] Optionally, the device further includes: The eighth switching module is used to control the target vehicle to switch from direct drive second gear mode to pure electric mode when the target vehicle's current battery level is greater than the preset battery level threshold, the target vehicle's current speed drops to the sixth speed threshold, and the current throttle opening is the target opening; and when the target vehicle's current speed drops to the seventh speed threshold, and the current throttle opening is the target opening, the target vehicle's power mode remains unchanged in pure electric mode.

[0165] Optionally, the determining module 301 is used for: Based on the target speed range, at least one second vehicle speed range is determined, and the vehicle speed range corresponding to the engine's efficient operating speed is defined in at least one second vehicle speed range. The first speed range is determined based on at least one second speed range.

[0166] In this embodiment, a first vehicle speed range is first determined based on the target speed range. This allows for the determination of the vehicle speed range corresponding to the inefficient operating speeds based on the engine's efficient operating speed range. In other words, it determines the possible vehicle speed range where the target vehicle's speed might be when the engine cannot efficiently output power. Then, when the target vehicle is driving in direct drive first gear mode, if the target vehicle's current speed reaches the speed of the first speed range, the target vehicle can be controlled to switch from direct drive first gear mode to series mode and drive in series mode. Afterward, when the current speed exceeds the maximum speed of the first speed range, the target vehicle is controlled to switch to direct drive second gear mode. Thus, by controlling the target vehicle to switch from direct drive first gear mode to series mode within the first vehicle speed range corresponding to the engine's inefficient operating speed, the vehicle is prevented from switching to direct drive second gear mode within the first speed range. This avoids the engine operating at low efficiency, instead improving power performance under this condition through the response of the drive motor in series mode. Furthermore, the vehicle only switches to direct drive second gear mode after exceeding the first speed range. Since the engine speed matched with the vehicle speed after exceeding the first speed range is within the efficient operating speed range, the engine can output power efficiently. Therefore, the overall vehicle power performance can be guaranteed throughout the entire switching process from direct drive first gear mode to direct drive second gear mode, thereby improving the driving experience.

[0167] It should be noted that the power mode switching device provided in the above embodiments is only illustrated by the division of the above functional modules when switching power modes. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0168] The functional units and modules in the above embodiments 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. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of the embodiments of this application.

[0169] The power mode switching device and power mode switching method provided in the above embodiments belong to the same concept. The specific working process and technical effects of the units and modules in the above embodiments can be found in the method embodiments section, and will not be repeated here.

[0170] Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0171] For example, such as Figure 4 As shown, the vehicle 400 includes a memory 41 and a processor 40, wherein the memory 41 stores executable program code 42, and the processor 40 is used to call and execute the executable program code 42 to perform the aforementioned power mode switching method.

[0172] This embodiment can divide the vehicle into functional modules according to the above method example. For example, each function can be assigned to a separate module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0173] When each functional module is divided according to its corresponding function, the vehicle may include: a determining module, a first switching module, and a second switching module. It should be noted that all relevant content regarding the steps involved in the above method embodiments can be referenced from the functional descriptions of the corresponding functional modules, and will not be repeated here.

[0174] The vehicle provided in this embodiment is used to execute the above-described power mode switching method, and thus can achieve the same effect as the above implementation method.

[0175] When using integrated units, the vehicle may include a processing module and a storage module. The processing module is used to control and manage the vehicle's actions. The storage module is used to support the vehicle in executing corresponding program code and data.

[0176] The processing module may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits shown in conjunction with the disclosure of this application. The processor may also be a combination of functions that implement computing capabilities, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc., and the storage module may be a memory.

[0177] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the aforementioned method steps to implement the aforementioned power mode switching method in the above embodiment.

[0178] This embodiment also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned related steps to implement the power mode switching method described in the above embodiment.

[0179] In this embodiment, the vehicle, computer-readable storage medium, computer program product, or chip are all used to execute the method described above. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects of the method described above, and will not be repeated here.

[0180] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0181] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are illustrative; for instance, the division of modules or units is merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0182] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for switching power modes, characterized in that, The method includes: Based on the target speed range, a first vehicle speed range is determined. The target speed range is the high-efficiency operating speed range of the engine of the target vehicle, and the first vehicle speed range is the vehicle speed range corresponding to the low-efficiency operating speed of the engine. When the target vehicle is currently in direct drive first gear mode and the current speed of the target vehicle is within the first speed range, control the target vehicle to switch from direct drive first gear mode to series mode and drive in series mode. If the current vehicle speed exceeds the maximum speed in the first speed range, the target vehicle is controlled to switch from the serial mode to the direct drive second gear mode and driven in the direct drive second gear mode.

2. The method as described in claim 1, characterized in that, When the target vehicle is currently in direct drive first gear mode and its current speed is within the first speed range, controlling the target vehicle to switch from direct drive first gear mode to series mode includes: When the target vehicle is in the direct drive first gear mode, if the current speed of the target vehicle reaches the first speed threshold and the current throttle opening is in the first opening range, the target vehicle is controlled to switch from the direct drive first gear mode to the serial mode. And, when the current vehicle speed is greater than the maximum vehicle speed in the first speed range, controlling the target vehicle to switch from the series mode to the direct drive second-gear mode includes: When the current speed of the target vehicle increases and exceeds the second speed threshold, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from the serial mode to the direct drive second-gear mode. The second speed threshold is greater than the first speed threshold, and the speed range formed by the first speed threshold and the second speed threshold is the first speed range.

3. The method as described in claim 1, characterized in that, When the target vehicle is currently in direct drive first gear mode and its current speed is within the first speed range, controlling the target vehicle to switch from direct drive first gear mode to series mode includes: When the target vehicle is in the direct drive first gear mode, if the current speed of the target vehicle reaches the first speed threshold, and the difference between the current speed and the first speed threshold is greater than or equal to a preset speed difference and remains for a preset time, and the current throttle opening is in the first opening range, the target vehicle is controlled to switch from the direct drive first gear mode to the serial mode. And when the current vehicle speed exceeds the maximum speed in the first speed range, controlling the target vehicle to switch from the series mode to the direct drive second-gear mode includes: When the current speed of the target vehicle increases and exceeds the second speed threshold, and the difference between the current speed and the second speed threshold is the preset speed difference and is maintained for the preset duration, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from the serial mode to the direct drive second gear mode.

4. The method as described in claim 2, characterized in that, The method further includes: If the current battery level of the target vehicle is less than or equal to a preset battery level threshold, and if the target vehicle is currently in series mode and the current vehicle speed reaches a third vehicle speed threshold, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from series mode to direct drive first gear mode. The third vehicle speed threshold is less than the first vehicle speed threshold, and the engine speed corresponding to the speed range formed by the third vehicle speed threshold and the first vehicle speed threshold is within the target speed range. If the current battery level of the target vehicle is greater than the preset battery level threshold, and if the target vehicle is currently in pure electric mode and the current vehicle speed reaches the third vehicle speed threshold, and the current throttle opening is within the first opening range, the target vehicle is controlled to switch from the pure electric mode to the direct drive first gear mode.

5. The method as described in claim 4, characterized in that, The method further includes: If the current battery level of the target vehicle is less than or equal to the preset battery level threshold, and if the target vehicle is currently in series mode and the current vehicle speed reaches the fourth vehicle speed threshold, and the current throttle opening is in the second opening range, control the target vehicle to switch from series mode to direct drive first gear mode. The fourth vehicle speed threshold is less than the third vehicle speed threshold, and the throttle opening included in the second opening range is greater than the throttle opening included in the first opening range. If the current battery level of the target vehicle is greater than the preset battery level threshold, and if the target vehicle is currently in pure electric mode and the current vehicle speed reaches the fourth vehicle speed threshold, and the current throttle opening is within the second opening range, the target vehicle is controlled to switch from pure electric mode to direct drive first gear mode.

6. The method as described in claim 5, characterized in that, The method further includes: If the target vehicle's current battery level is less than or equal to the preset battery level threshold, and if the target vehicle is currently in series mode and the current vehicle speed is greater than or equal to the fifth vehicle speed threshold and less than the fourth vehicle speed threshold, and the current throttle opening is in the third opening range, control the target vehicle to switch from series mode to direct drive first gear mode, where the fifth vehicle speed threshold is less than the fourth vehicle speed threshold, and the throttle opening included in the third opening range is greater than the throttle opening included in the second opening range; If the target vehicle's current battery level is greater than the preset battery level threshold, and if the target vehicle is currently in pure electric mode and its current speed is greater than or equal to the fifth speed threshold and less than the fourth speed threshold, and the current throttle opening is within the third opening range, the target vehicle is controlled to switch from pure electric mode to direct drive first gear mode.

7. The method as described in claim 2, characterized in that, The method further includes: When the target vehicle is in the direct drive second gear mode, if the current speed of the target vehicle drops to the sixth speed threshold and the current throttle opening is in the fourth opening range, then the target vehicle is controlled to switch from the direct drive second gear mode to the series mode. The sixth speed threshold is less than the second speed threshold, and the difference between the second speed threshold and the sixth speed threshold is a preset speed difference. If the current speed of the target vehicle drops to the seventh speed threshold and the current throttle opening is in the fourth opening range, then the target vehicle is controlled to switch from the serial mode to the direct drive first gear mode. The sixth speed threshold is greater than the seventh speed threshold, the seventh speed threshold is less than the first speed threshold, and the difference between the first speed threshold and the seventh speed threshold is a preset speed difference.

8. The method as described in claim 7, characterized in that, The method further includes: If the current battery level of the target vehicle is greater than the preset battery level threshold, and the current speed of the target vehicle drops to the sixth speed threshold, and the current throttle opening is the target opening, then the target vehicle is controlled to switch from the direct drive second-gear mode to the pure electric mode. When the current speed of the target vehicle drops to the seventh speed threshold and the current throttle opening is the target opening, the power mode of the target vehicle is controlled to remain unchanged in the pure electric mode.

9. The method as described in claim 1, characterized in that, The determination of the first vehicle speed range based on the target rotational speed range includes: Based on the target speed range, at least one second vehicle speed range is determined, wherein the at least one second vehicle speed range is the vehicle speed range corresponding to the engine's efficient operating speed. The first speed range is determined based on the at least one second speed range.

10. A vehicle, characterized in that, The vehicles include: Memory, used to store executable program code; A processor for calling and running the executable program code from the memory, causing the vehicle to perform the method as described in any one of claims 1 to 9.

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