Extended-range power assembly, control method and electric vehicle

Abstract

The invention provides an extended-range power assembly, a control method and an electric vehicle, and is applied to the technical field of electric vehicles. The range-extended power assembly comprises a generator, a generator controller and a range-extended engine, and in the running process that the vehicle speed of the electric vehicle is smaller than or equal to a first preset vehicle speed and the range-extended power assembly generates electricity, the generator of the range-extended power assembly actively outputs torque to the crankshaft in the electricity generation process. Noise vibration generated by the range-extending power assembly is actively restrained, and non-inductive range extending is achieved. In the running process that the speed of the electric vehicle is larger than or equal to the second preset speed, the second preset speed is larger than the first preset speed, the generator stops outputting the torque to the crankshaft in the power generation process, and active restraining of noise vibration generated by the range extending type power assembly is stopped; and the risk that the power generation efficiency is reduced due to active output torque of the generator is avoided.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and more particularly to a range-extended powertrain, control method, and electric vehicle. Background Technology

[0002] Compared to pure electric vehicles, range-extended electric vehicles (REEVs) have the advantage of being able to operate on both gasoline and electric power. When the battery charge is low, a generator set consisting of a range extender engine and a generator can quickly replenish the battery. However, during start-stop and operation, the torque output of the range extender engine in a range-extended powertrain fluctuates, generating significant vibration and noise. This leads to energy consumption, noise, vibration, and harshness (NVH) issues, impacting the user's driving experience. Summary of the Invention

[0003] This application provides a range-extended powertrain, a control method, and an electric vehicle. By actively suppressing the torque fluctuation of the range-extended engine through the output torque on the generator side, the vibration force emitted by the range-extended powertrain composed of the range-extended engine and the generator is actively suppressed, thereby reducing the noise and vibration generated by the range-extended powertrain itself.

[0004] In a first aspect, embodiments of this application provide a range-extended powertrain, which uses the torque output from the crankshaft of a range-extended engine to generate electricity during the operation of an electric vehicle to charge the power battery of the electric vehicle or to drive the wheels of the electric vehicle.

[0005] When the electric vehicle is traveling at a speed less than or equal to a first preset speed, the generator of the range-extended powertrain actively outputs torque to the crankshaft during the power generation process.

[0006] During the operation of the electric vehicle at a speed greater than or equal to the second preset speed, the generator stops outputting torque to the crankshaft during the power generation process, and the second preset speed is greater than the first preset speed.

[0007] In this embodiment, by detecting the relationship between the electric vehicle's speed and a first preset speed and a second preset speed, and since the second preset speed is greater than the first preset speed, if the electric vehicle's speed is less than or equal to the first preset speed, the system automatically detects that the electric vehicle is traveling at a low speed; conversely, if the speed is greater than or equal to the second preset speed, the system automatically detects that the electric vehicle is traveling at a high speed. During low-speed operation, the electric vehicle experiences less tire noise and wind noise. The noise and vibration generated by the range-extended powertrain itself cannot be masked by these noises. The generator in the range-extended powertrain actively outputs torque to the crankshaft during power generation, actively suppressing the noise and vibration generated by the powertrain itself. This achieves imperceptible range extension, meaning that passengers can hardly feel the noise and vibration generated by the operation and start-stop of the range-extended powertrain, thereby improving the comfort and driving experience of the electric vehicle.

[0008] When electric vehicles travel at high speeds, the tire noise and wind noise are relatively large. The noise and vibration generated by the range-extended powertrain itself will be masked by the tire noise and wind noise. During the power generation process, the generator stops outputting torque to the crankshaft, that is, it stops actively suppressing the noise and vibration generated by the range-extended powertrain itself, avoiding the risk of reduced power generation efficiency due to the generator actively outputting torque, and reducing energy consumption.

[0009] Therefore, the generator of the range-extended powertrain provided in this application can selectively output torque to the crankshaft or not output torque during the generator process according to the vehicle speed. This allows the generator to output torque to suppress noise during driving when the noise and vibration generated by the range-extended powertrain itself cannot be masked by tire noise and wind noise, and to not output torque during driving when the noise and vibration generated by the range-extended powertrain itself can be masked by tire noise and wind noise, thereby saving energy. Thus, the range-extended powertrain provided in this application achieves a balance between low noise and vibration and low energy consumption.

[0010] In one embodiment of the first aspect, during the driving process of the electric vehicle at a speed greater than a first preset speed and less than a second preset speed, when the power output of the generator is less than the preset power, the generator actively outputs torque to the crankshaft during the power generation process.

[0011] In this embodiment, the system automatically detects that the electric vehicle is traveling at a medium speed by detecting that its speed is greater than a first preset speed but less than a second preset speed. It also automatically detects that the generator's power output is low by detecting that the generator's power output is less than a preset power output. During this period of medium speed travel and low power output, the forces causing noise and vibration in the range-extended powertrain are periodic. These forces can be counteracted by the generator's actively and regularly outputting torque during power generation. This actively suppresses the noise and vibration generated by the range-extended powertrain itself, with good suppression effect, thus improving the comfort and driving experience of the electric vehicle.

[0012] In one embodiment of the first aspect, during the operation of the electric vehicle at a speed greater than a first preset speed and less than a second preset speed, when the generator's power output is greater than or equal to a preset power, the generator stops outputting torque to the crankshaft during the power generation process.

[0013] In this embodiment, the generator's power output is automatically detected as being greater than or equal to a preset power output. When the electric vehicle is traveling at a medium speed and the power output is high, the fuel combustion process becomes more intense and unstable, generating more broadband and random vibrations and noise. In other words, the forces causing vibration and noise in the range-extended powertrain are random and irregular, making it difficult to control the generator to produce a counteracting force. Therefore, vibration and noise suppression of the range-extended powertrain is difficult and ineffective. On the other hand, tire noise and wind noise from the electric vehicle can partially mask the noise and vibration generated by the range-extended powertrain itself. By stopping the generator from outputting torque to the crankshaft during power generation, the active suppression of noise and vibration generated by the range-extended powertrain itself is stopped, avoiding the reduction in power generation efficiency and excessive energy consumption caused by the generator actively outputting torque.

[0014] In one embodiment of the first aspect, during the operation of the electric vehicle, when the speed of the electric vehicle decreases from greater than or equal to a second preset speed to less than or equal to a first preset speed, the torque actively output by the generator to the crankshaft increases to a preset value at a first rate within a preset time period.

[0015] In this embodiment, during the operation of the electric vehicle at low or high speeds, the torque actively output by the generator to the crankshaft increases to a preset value at a first rate within a preset time period. This avoids sudden changes in the torque output by the generator, which could cause abrupt changes in the stress state of the range-extended powertrain and prevent passengers from experiencing noticeable jerking, thus improving the comfort of the electric vehicle. Simultaneously, by setting a preset time period, the rate of increase of the generator's output torque, i.e., the magnitude of the first rate, is limited. This prevents the first rate from being too large, which would reduce the comfort of the electric vehicle, and from being too small, which would delay the vibration suppression effect. This achieves both a guaranteed driving experience and timely vibration suppression.

[0016] In one embodiment of the first aspect, during the process of the generator actively outputting torque to the crankshaft, the torque output by the generator increases with the increase of vehicle speed.

[0017] In this embodiment, the higher the speed of the electric vehicle, the greater the noise and vibration generated by the range-extended powertrain itself. In this case, the torque output by the generator increases with the vehicle speed, thus increasing the effectiveness of actively suppressing noise and vibration. The generator flexibly adjusts its output torque according to the vehicle speed, adjusting the effectiveness of actively suppressing noise and vibration, thereby ensuring that the generator can output a corresponding amount of torque at different vehicle speeds, actively suppressing the noise and vibration generated by the range-extended powertrain itself, and achieving seamless range extension.

[0018] In one embodiment of the first aspect, during the process of the generator actively outputting torque to the crankshaft, the torque output by the generator increases as the generator's power output increases.

[0019] In this embodiment, the higher the generator's output power, the greater the noise and vibration generated by the range-extender powertrain itself. In this case, the generator's output torque increases with the increase in output power, thus increasing the effectiveness of actively suppressing noise and vibration. The generator flexibly adjusts its output torque according to the output power, adjusting the effectiveness of actively suppressing noise and vibration, ensuring that the generator can output a corresponding amount of torque under different output power conditions, actively suppressing the noise and vibration generated by the range-extender powertrain itself, thereby achieving seamless range extension.

[0020] In one embodiment of the first aspect, during the process of the generator actively outputting torque to the crankshaft, the torque actively output by the generator varies with the torque output by the range extender engine.

[0021] In this embodiment, the greater the torque output by the range extender engine, the greater the noise and vibration generated by the range extender powertrain. In this case, the torque actively output by the generator varies with the torque output by the range extender engine; the greater the torque output by the range extender engine, the greater the torque output by the generator, and vice versa. The generator flexibly adjusts its output torque based on the magnitude of the torque output by the range extender engine, i.e., the magnitude of the noise and vibration generated by the range extender powertrain, thus flexibly controlling the degree of active noise and vibration suppression and achieving seamless range extension.

[0022] In one embodiment of the first aspect, during the process of the generator actively outputting torque to the crankshaft, the torque actively output by the generator varies with the position angle of the rotor.

[0023] In this embodiment, changes in the rotor position angle affect the intensity of noise and vibration generated by the range-extended powertrain. In this case, the torque actively output by the generator changes with the rotor position angle; the greater the deviation in rotor position angle, the greater the generator output torque, and vice versa. This allows the generator to flexibly adjust its output torque according to the changes in rotor position angle, i.e., the magnitude of noise and vibration generated by the range-extended powertrain, thereby actively suppressing noise and vibration and achieving seamless range extension.

[0024] In one embodiment of the first aspect, when the state of charge (SOC) of the electric vehicle's power battery is less than a threshold, the torque output by the generator decreases as the SOC increases.

[0025] In this embodiment, the need to activate the range-extended powertrain is determined by detecting that the state of charge (SOC) of the electric vehicle's battery is below a threshold. While the range-extended powertrain is operating, a higher SOC results in lower generator output power and less noise and vibration from the powertrain. In this situation, the generator's output torque decreases as the SOC increases, suppressing the reduced noise and vibration. Thus, the generator flexibly adjusts its output torque according to the SOC, actively suppressing the noise and vibration generated by the range-extended powertrain itself, thereby achieving seamless range extension.

[0026] In one embodiment of the first aspect, during the driving process of the electric vehicle at a speed less than or equal to a first preset speed, the generator actively outputs a first torque to the crankshaft during the power generation process; during the driving process of the electric vehicle at a speed greater than the first preset speed but less than a second preset speed and the power generation of the generator is less than a preset power, the generator actively outputs a second torque to the crankshaft during the power generation process; wherein the average value of the first torque is less than the average value of the second torque.

[0027] In this embodiment, when the vehicle speed is greater than the first preset speed and less than the second preset speed, and the power generation is less than the preset power, i.e., the electric vehicle is traveling at a medium speed and the power generation is relatively small, the average torque output by the generator during the power generation process is relatively small. Conversely, when the electric vehicle speed is less than or equal to the first preset speed, the average torque output by the generator during the power generation process is relatively large. By making reasonable use of the noise levels such as tire noise and wind noise during the electric vehicle's operation, while also considering the noise and vibration generated by the range-extended powertrain itself, the noise and vibration generated by the range-extended powertrain itself can be suppressed, thereby reducing the energy consumption of the range-extended powertrain while achieving seamless range extension.

[0028] In one embodiment of the first aspect, the direction of the torque actively output by the generator to the crankshaft is opposite to the direction of the torque output by the range extender engine 112.

[0029] Since the noise and vibration generated by the range-extended powertrain itself mainly come from the torque fluctuations output by the range-extending engine for power generation, in this embodiment, during the process of the generator actively outputting torque to the crankshaft, the torque output by the generator is kept in the opposite direction to the torque output by the engine. This makes better use of the torque actively output by the generator to the crankshaft to counteract the torque that causes vibration and noise in the range-extended powertrain, thereby improving the vibration suppression effect of the range-extended powertrain.

[0030] Secondly, embodiments of this application provide a control method for a range-extended powertrain, the control method being used to reduce the noise generated by the range-extended powertrain during the operation of an electric vehicle, including the following steps.

[0031] During the driving process of an electric vehicle at a speed less than or equal to a first preset speed, the generator controlling the range-extended powertrain actively outputs torque to the crankshaft during the power generation process.

[0032] After the speed of the electric vehicle increases from less than or equal to a first preset speed to greater than or equal to a second preset speed, the generator is controlled to stop outputting torque to the crankshaft during the power generation process.

[0033] In this embodiment, when the electric vehicle's speed is less than or equal to a first preset speed and the range-extended powertrain is generating electricity, the tire noise, wind noise, and other noises of the electric vehicle are relatively low. By controlling the generator of the range-extended powertrain to actively output torque to the crankshaft during the power generation process, the noise and vibration generated by the range-extended powertrain itself are actively suppressed, thereby achieving imperceptible range extension. Furthermore, after the electric vehicle's speed increases from less than or equal to the first preset speed to greater than or equal to the second preset speed, the tire noise, wind noise, and other noises of the electric vehicle increase. The noise and vibration generated by the range-extended powertrain itself are masked by the increased tire noise, wind noise, and other noises. By controlling the generator to stop outputting torque to the crankshaft, the active vibration damping is stopped, avoiding the risk of reduced power generation efficiency due to the generator actively outputting torque, and simultaneously reducing energy consumption.

[0034] In one embodiment of the second aspect, the control method further includes: after the speed of the electric vehicle increases from less than or equal to a first preset speed to greater than the first preset speed and less than a second preset speed, when the power output of the generator is less than a preset power, controlling the generator of the range-extended powertrain to actively output torque to the crankshaft during the power generation process.

[0035] In this embodiment, after the speed of the electric vehicle increases from less than or equal to the first preset speed to greater than the first preset speed and less than the second preset speed, the force that generates noise and vibration in the range-extended powertrain is periodic and easily canceled out. By controlling the generator of the range-extended powertrain to actively output torque to the crankshaft during the power generation process, the noise and vibration generated by the range-extended powertrain itself are actively suppressed, and the suppression effect is good, improving the comfort and driving experience of the electric vehicle.

[0036] In one embodiment of the second aspect, the control method specifically includes: after the speed of the electric vehicle increases from less than or equal to a first preset speed to greater than or equal to a second preset speed, controlling the torque actively output by the generator to the crankshaft to decrease to zero at a second rate within a first preset duration.

[0037] In this embodiment, after the electric vehicle's speed increases from low to high, the torque output by the generator is controlled to decrease to zero at a second rate. This avoids sudden changes in the generator's torque output that could cause abrupt changes in the stress state of the range-extended powertrain and prevent passengers from experiencing noticeable jerking, thus improving the comfort of the electric vehicle. Furthermore, by setting a first preset duration to limit the rate of decrease in the generator's torque output (i.e., the magnitude of the second rate), excessively high second rates prevent vibration suppression from being canceled too quickly, which could lead to a sharp change in the generated torque, increasing noise and vibration generated by the range-extended powertrain, further improving the comfort of the electric vehicle.

[0038] In one embodiment of the second aspect, the control method specifically includes: during the process of controlling the generator to actively output torque to the crankshaft, controlling the torque output by the generator to increase with the increase of vehicle speed.

[0039] In one embodiment of the second aspect, the control method specifically includes: during the process of controlling the generator to actively output torque to the crankshaft, controlling the torque output by the generator to increase as the generator's power output increases.

[0040] Thirdly, embodiments of this application provide an electric vehicle, which includes a range-extended powertrain and a power battery. The range-extended powertrain is used to generate electricity during the electric vehicle's operation using the torque output from the crankshaft of the range-extending engine to charge the electric vehicle's power battery or drive the electric vehicle's wheels, wherein:

[0041] When the electric vehicle is traveling at a speed less than or equal to a first preset speed, the generator of the range extender powertrain actively outputs torque to the crankshaft during the power generation process; when the electric vehicle is traveling at a speed greater than or equal to a second preset speed, the generator stops outputting torque to the crankshaft during the power generation process, and the second preset speed is greater than the first preset speed.

[0042] The supplementary solutions and technical effects provided in the second and third aspects above can be found in the corresponding descriptions in the first aspect, and will not be repeated here. Attached Figure Description

[0043] Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of this application is shown;

[0044] Figure 2 A schematic diagram of a range-extended powertrain provided in an embodiment of this application is shown;

[0045] Figure 3 This diagram illustrates the vehicle speed and generator output torque of an electric vehicle according to an embodiment of this application.

[0046] Figure 4 A schematic diagram of a generator controller provided in an embodiment of this application is shown;

[0047] Figure 5 A schematic diagram of another generator controller provided in an embodiment of this application is shown;

[0048] Figure 6 This illustration shows a schematic diagram of the vehicle speed, power generation, and generator output torque of an electric vehicle according to an embodiment of this application;

[0049] Figure 7 A schematic diagram of yet another generator controller provided in an embodiment of this application is shown;

[0050] Figure 8 This illustration shows a schematic diagram of the change in the output torque of a generator according to an embodiment of this application;

[0051] Figure 9 A timing diagram showing the vehicle speed and generator output torque of an electric vehicle according to an embodiment of this application is shown;

[0052] Figure 10 A timing diagram showing the vehicle speed, power generation, and generator output torque of an electric vehicle according to an embodiment of this application is shown.

[0053] Figure 11 A schematic diagram of a control method for a range-extended powertrain according to an embodiment of this application is shown. Detailed Implementation

[0054] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0055] The use of prefixes such as "first" and "second" in this application embodiment is solely for distinguishing different descriptive objects and does not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes to distinguish descriptive objects in this application embodiment does not constitute a limitation on the described objects. The description of the described objects is found in the claims or the context of the embodiments, and the use of such prefixes should not constitute unnecessary restrictions.

[0056] During the quick refueling process of a range-extended powertrain, the output of the range-extended engine comes from fuel combustion, and the reciprocating motion of the internal piston and the rotational motion of the crankshaft will generate unbalanced forces, resulting in large fluctuations in the torque output of the range-extended engine, which will produce greater noise and vibration, affecting the user's driving experience.

[0057] In view of this, embodiments of this application provide a range-extended powertrain, a control method, and an electric vehicle. The range-extended powertrain includes a generator, a generator controller, and a range-extending engine. When the electric vehicle is traveling at a speed less than or equal to a first preset speed, the generator of the range-extended powertrain actively outputs torque to the crankshaft during power generation. When the electric vehicle is traveling at a speed greater than or equal to a second preset speed, the generator stops outputting torque to the crankshaft during power generation, where the second preset speed is greater than the first preset speed. This achieves active suppression of noise and vibration generated by the range-extended powertrain itself when the electric vehicle is traveling at low speeds, thereby achieving imperceptible range extension and improving the comfort and driving experience of the electric vehicle. Furthermore, when the electric vehicle is traveling at high speeds, the active suppression of noise and vibration generated by the range-extended powertrain itself ceases, avoiding the risk of reduced power generation efficiency due to the generator actively outputting torque, while simultaneously reducing energy consumption.

[0058] See Figure 1 , Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of this application is shown. (As shown) Figure 1 As shown, the electric vehicle 100 includes a range-extended powertrain 110, a power battery 120 connected to the range-extended powertrain 110, and a vehicle controller 130. The electric vehicle 100 can be a range-extended electric vehicle, and the range-extended powertrain 110, also known as a range extender, is used to charge the power battery 120. The power battery 120 provides energy to the electric vehicle 100. The vehicle controller 130 controls the range-extended powertrain 110 to charge the power battery 120. The vehicle controller can be a vehicle controller or a range extender controller.

[0059] See Figure 2 , Figure 2A schematic diagram of a range-extended powertrain according to an embodiment of this application is shown. The range-extended powertrain 110 includes a generator 111, a range-extending engine 112, a generator controller 113, an engine controller 114, and a fuel tank (not shown). Specifically, the range-extended powertrain 110 is used to generate electricity during the operation of an electric vehicle by utilizing the torque output from the crankshaft of the range-extending engine 112 to charge the power battery of the electric vehicle or drive the wheels of the electric vehicle.

[0060] The generator controller 113 controls the operation of the generator 111. The generator controller 113 is connected to the vehicle controller 130 and controls the generator 111 according to the instructions from the vehicle controller 130. The generator controller 113 can receive the current output from the generator 111, integrate the current, and output current to the power battery 120 for charging. The generator controller 113 can also output current to the generator 111 to control the output torque of the generator 111. The engine controller 114 controls the operation of the range extender engine 112, such as controlling the ignition or shutdown of the range extender engine 112.

[0061] The generator 111 is coaxially connected to the range extender engine 112. Specifically, the rotor of the generator 111 is connected to the crankshaft of the range extender engine 112, and can also be connected via a drive shaft or a reducer. The rotational speed of the generator 111 is the same as the rotational speed of the crankshaft.

[0062] The range extender engine 112 may include multiple cylinders and multiple pistons. Each piston reciprocates within each cylinder. The piston is connected to the crankshaft via a connecting rod, and the crankshaft converts the reciprocating motion of the piston into rotational motion at its shaft end, thereby outputting torque. At any given time, the positions of the multiple pistons within the cylinders may not be exactly the same, but the relative positions between the multiple pistons are fixed.

[0063] The vehicle controller 130 is the control center of the electric vehicle. It monitors the state of charge (SOC) of the power battery 120 and user driving information in real time, and controls the start / stop and power output of the range-extended powertrain 110 after comprehensive judgment to maintain the power battery's charge balance. Specifically, when the SOC of the power battery 120 is lower than or equal to a threshold, the vehicle controller 130 controls the range-extended engine 112 to switch from a stopped state to an operating state so that the range-extended powertrain 110 charges the power battery 120. When the SOC of the power battery 120 is higher than the threshold, the vehicle controller 130 controls the range-extended engine 112 to switch from an operating state to a stopped state.

[0064] When the range extender engine 112 is in a stopped state, the piston of the range extender engine 112 stops moving and the rotor of the generator 111 stops moving.

[0065] When the range extender engine 112 is running, the reciprocating motion of the piston in the range extender engine 112 outputs torque to the crankshaft to drive the rotor of the generator 111 to rotate, converting the mechanical energy on the range extender engine 112 into electrical energy, thereby charging the power battery 120 and achieving the purpose of online energy replenishment. The torque can be adjusted according to the charging power requirements.

[0066] When the range extender engine 112 is running, a complete working cycle of the range extender engine 112 includes four working states: compression, power, exhaust, and intake. Torque output is only achieved in the power state; the other three states are simply rotating. In each working cycle, the piston of the range extender engine 112 travels back and forth twice between top dead center and bottom dead center. In the power and intake states, the piston moves from top dead center to bottom dead center. In the exhaust and compression states, the piston moves from bottom dead center to top dead center. The torque output of the range extender engine 112 fluctuates significantly throughout the entire working cycle.

[0067] The architecture of the embodiments of this application has been described above. The range-extended powertrain provided by this application will be described below with reference to specific embodiments.

[0068] The range-extended powertrain 110 provided in this application can actively suppress torque fluctuations on the range-extended engine 112 side by outputting torque on the generator 111 side, thereby suppressing the vibration emitted by the range-extended powertrain 110 composed of the range-extended engine 112 and the generator 111, and reducing the noise and vibration generated by the range-extended powertrain 110 itself.

[0069] In one embodiment, during the driving process of the electric vehicle at a speed less than or equal to a first preset speed, the generator 111 of the range-extended powertrain 110 actively outputs torque to the crankshaft during the power generation process.

[0070] Where the speed of the electric vehicle is less than the first preset speed, it means that the electric vehicle is traveling at a low speed.

[0071] In one embodiment, the electric vehicle's speed is greater than zero.

[0072] When an electric vehicle is traveling at low speed, the tire noise and wind noise are relatively small. The noise and vibration generated by the range-extended powertrain after it starts cannot be masked or completely masked by the tire noise and wind noise, and are easily perceived by the driver and passengers.

[0073] In this case, the generator of the range-extended powertrain actively outputs torque to the crankshaft during the power generation process, actively suppressing the noise and vibration generated by the range-extended powertrain itself, thereby achieving imperceptible range extension. That is, the driver and passengers can hardly feel the noise and vibration generated by the operation and start-stop of the range-extended powertrain, thereby improving the comfort and driving experience of electric vehicles.

[0074] Among them, controlling the generator to actively output torque to the crankshaft means that the torque is actively output by the generator, which is different from the braking torque generated by the generator rotor under the drive of the range extender engine. The braking torque is the torque passively output by the generator.

[0075] In one embodiment, the direction of the torque actively output by the generator 111 to the crankshaft is opposite to the direction of the torque output by the range extender engine 112.

[0076] Since the noise and vibration generated by the range-extended powertrain itself mainly come from the torque fluctuations output by the range-extending engine for power generation, in this embodiment, during the process of the generator actively outputting torque to the crankshaft, the torque output by the generator is kept in the opposite direction to the torque output by the engine. This makes better use of the torque actively output by the generator to the crankshaft to counteract the torque that causes vibration and noise in the range-extended powertrain, thereby improving the vibration suppression effect of the range-extended powertrain.

[0077] In one embodiment, when the electric vehicle is traveling at a speed greater than or equal to a second preset speed, the generator 111 stops outputting torque to the crankshaft during the power generation process, and the second preset speed is greater than the first preset speed.

[0078] When the speed of an electric vehicle is greater than or equal to the second preset speed, it means that the electric vehicle is traveling at a high speed.

[0079] When electric vehicles travel at high speeds, the tire noise and wind noise are relatively large. The noise and vibration generated by the range-extended powertrain itself are masked by the tire noise and wind noise. Even when the range-extended powertrain is running and starting and stopping, the noise and vibration generated by the range-extended powertrain itself are mixed with the tire noise and wind noise, and are not obvious, or even difficult to detect.

[0080] In this situation, by stopping the generator from outputting torque to the crankshaft during the power generation process, the noise and vibration generated by the range-extended powertrain itself are actively suppressed, thus avoiding the risk of reduced power generation efficiency due to the generator actively outputting torque.

[0081] For ease of understanding, see Figure 3 , Figure 3 This diagram illustrates the vehicle speed and generator output torque of an electric vehicle according to an embodiment of this application.

[0082] like Figure 3 As shown, when the vehicle speed is less than the first preset vehicle speed V1, the generator outputs torque; when the vehicle speed is greater than the second preset vehicle speed V2, the generator does not output torque.

[0083] In one embodiment, when the vehicle speed is less than or equal to a first preset speed, the generator output torque can be controlled for all times, or it can be controlled for some time periods. Similarly, in one embodiment, when the vehicle speed is greater than or equal to the first preset speed, the generator output torque can be stopped for all times, or it can be controlled for some time periods.

[0084] In one embodiment, the generator's active torque output during power generation can be controlled by the generator controller 113, see [link to relevant documentation]. Figure 3 , Figure 4 A schematic diagram of a generator controller provided in an embodiment of this application is shown.

[0085] like Figure 4 As shown, the generator controller receives the vehicle speed signal. When the vehicle speed indicated by the vehicle speed signal is less than or equal to the first preset vehicle speed, the generator controller controls the generator to actively output torque. When the vehicle speed indicated by the vehicle speed signal is greater than or equal to the second preset vehicle speed, the generator controller controls the generator not to actively output torque.

[0086] And, see also Figure 5 , Figure 5 A schematic diagram of another generator controller provided in an embodiment of this application is shown.

[0087] like Figure 5 As shown, the vehicle controller receives a vehicle speed signal. When the vehicle speed indicated by the signal is less than or equal to a first preset speed, it sends a torque signal to the generator controller. The generator controller then controls the generator to output the torque indicated by the torque signal. When the vehicle speed indicated by the signal is greater than or equal to a second preset speed, it does not send a torque signal to the generator controller, and the generator controller prevents the generator from actively outputting torque. Alternatively, it sends an enable signal to the generator controller. If the enable signal is high, the generator controller controls the generator to output torque; if the enable signal is low, the generator does not output torque.

[0088] In this embodiment, by detecting the relationship between the electric vehicle's speed and a first preset speed and a second preset speed, and since the second preset speed is greater than the first preset speed, if the electric vehicle's speed is less than or equal to the first preset speed, the system automatically detects that the electric vehicle is traveling at a low speed; conversely, if the speed is greater than or equal to the second preset speed, the system automatically detects that the electric vehicle is traveling at a high speed. During low-speed operation, the electric vehicle experiences less tire noise and wind noise. The noise and vibration generated by the range-extended powertrain itself cannot be masked by these noises. The generator in the range-extended powertrain actively outputs torque to the crankshaft during power generation, actively suppressing the noise and vibration generated by the powertrain itself. This achieves imperceptible range extension, meaning that passengers can hardly feel the noise and vibration generated by the operation and start-stop of the range-extended powertrain, thereby improving the comfort and driving experience of the electric vehicle.

[0089] When electric vehicles travel at high speeds, the tire noise and wind noise are relatively large. The noise and vibration generated by the range-extended powertrain itself will be masked by the tire noise and wind noise. During the power generation process, the generator stops outputting torque to the crankshaft, that is, it stops actively suppressing the noise and vibration generated by the range-extended powertrain itself, avoiding the risk of reduced power generation efficiency due to the generator actively outputting torque, and reducing energy consumption.

[0090] In one embodiment, when the electric vehicle is traveling at a speed greater than a first preset speed and less than a second preset speed, if the power output of the generator 111 is less than the preset power, the generator 111 actively outputs torque to the crankshaft during the power generation process.

[0091] Where the speed of the electric vehicle is greater than the first preset speed but less than the second preset speed, it means that the electric vehicle is traveling at a medium speed.

[0092] If the generator's power output is less than the preset power, it means that the generator's power output is relatively low, which means that less fuel is burned, the mechanical impact and combustion explosion energy of the range extender engine are weaker, the exhaust flow is smaller, and the noise and vibration generated by the range extender powertrain itself are smaller.

[0093] When electric vehicles are traveling at medium speeds and generating relatively little power, the noise and vibration of the range-extended powertrain mainly come from reciprocating inertial forces (the reciprocating motion of pistons and connecting rods) and combustion burst forces. These forces are periodic and easily canceled out, resulting in good active vibration reduction.

[0094] In this case, the generator actively outputs torque to the crankshaft during the power generation process, which actively suppresses the noise and vibration generated by the range extender powertrain itself, and the effect is good.

[0095] For ease of understanding, see Figure 6 , Figure 6This illustration shows a schematic diagram of the vehicle speed, power generation, and generator output torque of an electric vehicle according to an embodiment of this application.

[0096] like Figure 6 As shown, the generator output torque is as follows when the vehicle speed is greater than the first preset vehicle speed V1 and less than the second preset vehicle speed V2, and the power generation is less than the preset power P.

[0097] In one embodiment, when the speed of the electric vehicle is greater than a first preset speed but less than a second preset speed and the power generation is less than a preset power, the generator output torque can be controlled at all times or at some times.

[0098] Similarly, when the generator controller controls the generator's active output torque, see [reference needed]. Figure 7 , Figure 7 A schematic diagram of another generator controller provided in an embodiment of this application is shown.

[0099] like Figure 7 As shown, the vehicle controller receives the vehicle speed signal and the generator power signal, and makes a judgment based on the vehicle speed indicated by the vehicle speed signal and the generator power indicated by the generator power signal. If the vehicle speed indicated by the vehicle speed signal is greater than a first preset vehicle speed but less than a second preset vehicle speed, and the generator power indicated by the generator power signal is less than a preset power, the controller sends a torque signal or a high-level enable signal to the generator controller, which then controls the generator to output torque.

[0100] In one embodiment, Figure 7 The generator controller shown can directly execute the step of determining whether to send a torque signal or an enable signal based on vehicle speed and power generation.

[0101] In this embodiment, the system automatically detects that the electric vehicle is traveling at a medium speed by detecting that its speed is greater than a first preset speed but less than a second preset speed. It also automatically detects that the generator's power output is low by detecting that the generator's power output is less than a preset power output. During this period of medium speed travel and low power output, the forces causing noise and vibration in the range-extended powertrain are periodic. These forces can be counteracted by the generator's actively and regularly outputting torque during power generation. This actively suppresses the noise and vibration generated by the range-extended powertrain itself, with good suppression effect, thus improving the comfort and driving experience of the electric vehicle.

[0102] In one embodiment, when the electric vehicle is traveling at a speed greater than a first preset speed and less than a second preset speed, if the power output of the generator 111 is greater than or equal to a preset power, the generator 111 stops outputting torque to the crankshaft during the power generation process.

[0103] If the generator's power output is greater than or equal to the preset power output, it means that the generator has a larger power output, which means that more fuel is burned, the mechanical impact and combustion explosion energy of the range extender engine are stronger, the exhaust flow is larger, and the noise and vibration generated by the range extender powertrain itself are greater.

[0104] When an electric vehicle is traveling at a medium speed and generating a large amount of electricity, the combustion process of fuel becomes more intense and unstable, producing more broadband, random vibrations and noise (known as "combustion roar"), which are difficult to suppress and have poor effectiveness. Furthermore, the tire noise and wind noise of an electric vehicle can partially mask the noise and vibration generated by the range-extended powertrain itself.

[0105] In this situation, by stopping the generator from outputting torque to the crankshaft during the power generation process, the noise and vibration generated by the range-extended powertrain itself are actively suppressed, thus avoiding the risk of reduced power generation efficiency due to the generator actively outputting torque.

[0106] See also Figure 6 and Figure 7 ,like Figure 6 As shown, when the vehicle speed is greater than the first preset vehicle speed V1 and less than the second preset vehicle speed V2, and the power generation is greater than the preset power P, the generator does not output torque.

[0107] like Figure 7 As shown, when the vehicle speed signal indicates a speed greater than the first preset speed but less than the second preset speed, and the generator power signal indicates a power generation greater than or equal to the preset power, the vehicle controller does not send a torque signal to the generator controller or sends an enable signal as a low-level signal, and the generator stops generating torque.

[0108] In this embodiment, the generator's power output is automatically detected as being greater than or equal to a preset power output. When the electric vehicle is traveling at a medium speed and the power output is high, the fuel combustion process becomes more intense and unstable, generating more broadband and random vibrations and noise. In other words, the forces causing vibration and noise in the range-extended powertrain are random and irregular, making it difficult to control the generator to produce a counteracting force. Therefore, vibration and noise suppression of the range-extended powertrain is difficult and ineffective. On the other hand, tire noise and wind noise from the electric vehicle can partially mask the noise and vibration generated by the range-extended powertrain itself. By stopping the generator from outputting torque to the crankshaft during power generation, the active suppression of noise and vibration generated by the range-extended powertrain itself is stopped, avoiding the reduction in power generation efficiency and excessive energy consumption caused by the generator actively outputting torque.

[0109] The following will describe in detail the changes in the generator's output torque during the power generation process.

[0110] In one embodiment, during the operation of the electric vehicle, when the speed of the electric vehicle decreases from greater than or equal to a second preset speed to less than or equal to a first preset speed, the torque actively output by the generator 111 to the crankshaft increases to a preset value at a first rate within a preset time period.

[0111] The preset value is the torque value that the calibrated generator needs to actively output to suppress noise and vibration.

[0112] In one embodiment, the preset value can be a value that remains constant in size.

[0113] In another embodiment, the preset value can be a constant value when the vehicle speed is less than or equal to a first preset vehicle speed, and a constant value when the electric vehicle speed is greater than the first preset vehicle speed but less than the second preset vehicle speed and the power generation is less than the preset power. The preset values ​​are different in the two cases.

[0114] In another embodiment, the preset value may vary with changes in vehicle speed and / or power generation.

[0115] In one embodiment, the magnitude of the first rate may be the same or different as the torque output by the generator increases to a preset value.

[0116] In another embodiment, the magnitude of the first rate is negatively correlated with the preset duration; the longer the preset duration, the smaller the first rate, and vice versa.

[0117] For ease of understanding, see Figure 8 , Figure 8 This illustration shows a schematic diagram of the change in torque output by a generator according to an embodiment of this application.

[0118] like Figure 8 As shown, the torque output by the generator increases linearly at a certain rate to a preset value T.

[0119] in, Figure 8 The variation in generator output torque shown is merely illustrative.

[0120] In this embodiment, during the operation of the electric vehicle at low or high speeds, the torque actively output by the generator to the crankshaft increases to a preset value at a first rate within a preset time period. This avoids sudden changes in the torque output by the generator, which could cause abrupt changes in the stress state of the range-extended powertrain and prevent passengers from experiencing noticeable jerking, thus improving the comfort of the electric vehicle. Simultaneously, by setting a preset time period, the rate of increase of the generator's output torque, i.e., the magnitude of the first rate, is limited. This prevents the first rate from being too large, which would reduce the comfort of the electric vehicle, and from being too small, which would delay the vibration suppression effect. This achieves both a guaranteed driving experience and timely vibration suppression.

[0121] In one embodiment, during the process of the generator 111 actively outputting torque to the crankshaft, the torque output by the generator 111 increases with the increase of vehicle speed.

[0122] The higher the vehicle speed, the greater the discharge current required by the power battery, the greater the power generation required by the range-extended powertrain, and the greater the noise and vibration generated by the range-extended powertrain itself.

[0123] In this situation, the torque output by the generator increases with the increase of vehicle speed, thereby increasing the active suppression of noise and vibration.

[0124] In this embodiment, the higher the speed of the electric vehicle, the greater the noise and vibration generated by the range-extended powertrain itself. In this case, the torque output by the generator increases with the vehicle speed, thus increasing the effectiveness of actively suppressing noise and vibration. The generator flexibly adjusts its output torque according to the vehicle speed, adjusting the effectiveness of actively suppressing noise and vibration, thereby ensuring that the generator can output a corresponding amount of torque at different vehicle speeds, actively suppressing the noise and vibration generated by the range-extended powertrain itself, and achieving seamless range extension.

[0125] In one embodiment, during the process of the generator 111 actively outputting torque to the crankshaft, the torque output by the generator 111 increases as the power output of the generator 111 increases.

[0126] The greater the generator's output power, the higher the efficiency of the range extender engine needs to be, and the greater the noise and vibration generated by the range extender powertrain.

[0127] In this case, the torque output by the generator increases with the increase of the power generation, thereby increasing the active suppression of noise and vibration.

[0128] In this embodiment, the higher the generator's output power, the greater the noise and vibration generated by the range-extender powertrain itself. In this case, the generator's output torque increases with the increase in output power, thus increasing the effectiveness of actively suppressing noise and vibration. The generator flexibly adjusts its output torque according to the output power, adjusting the effectiveness of actively suppressing noise and vibration, ensuring that the generator can output a corresponding amount of torque under different output power conditions, actively suppressing the noise and vibration generated by the range-extender powertrain itself, thereby achieving seamless range extension.

[0129] In one embodiment, during the process of generator 111 actively outputting torque to crankshaft, the torque actively output by generator 111 varies with the torque output by range extender engine.

[0130] The greater the torque output of the range extender engine, the greater the noise and vibration generated by the range extender powertrain; conversely, the smaller the torque output of the range extender engine, the less noise and vibration generated by the range extender powertrain.

[0131] In this situation, the generator adjusts the intensity of noise and vibration suppression generated by the range-extender powertrain according to the torque output of the extended engine, thereby achieving active noise and vibration suppression.

[0132] In this embodiment, the greater the torque output by the range extender engine, the greater the noise and vibration generated by the range extender powertrain. In this case, the torque actively output by the generator varies with the torque output by the range extender engine; the greater the torque output by the range extender engine, the greater the torque output by the generator, and vice versa. The generator flexibly adjusts its output torque based on the magnitude of the torque output by the range extender engine, i.e., the magnitude of the noise and vibration generated by the range extender powertrain, thus flexibly controlling the degree of active noise and vibration suppression and achieving seamless range extension.

[0133] In one embodiment, during the process of the generator 111 actively outputting torque to the crankshaft, the torque actively output by the generator 111 changes with the position angle of the rotor.

[0134] Changes in the rotor position angle will affect the torque output by the generator, thereby affecting the intensity of noise and vibration generated by the range-extended powertrain.

[0135] Under a certain load and speed, there is an optimal rotor position angle for the generator. At the optimal rotor position angle, the noise and vibration generated are smaller.

[0136] The greater the deviation between the rotor position angle and the optimal rotor position angle, the greater the intensity of noise and vibration generated by the range-extended powertrain.

[0137] In this situation, the generator actively suppresses noise and vibration by adjusting the intensity of its active noise suppression based on changes in the rotor's position angle.

[0138] In one embodiment, the rotor position angle can be acquired by a hardware resolver sensor or calculated by an algorithm based on the changing characteristics of the generator output current.

[0139] In this embodiment, changes in the rotor position angle affect the intensity of noise and vibration generated by the range-extended powertrain. In this case, the torque actively output by the generator changes with the rotor position angle; the greater the deviation in rotor position angle, the greater the generator output torque, and vice versa. This allows the generator to flexibly adjust its output torque according to the changes in rotor position angle, i.e., the magnitude of noise and vibration generated by the range-extended powertrain, thereby actively suppressing noise and vibration and achieving seamless range extension.

[0140] In one embodiment, when the state of charge (SOC) of the electric vehicle's power battery is less than a threshold, the torque output by the generator 111 decreases as the SOC increases.

[0141] If the state of charge (SOC) of the power battery is less than the threshold, it indicates that the power battery has low charge and the range-extended powertrain needs to be activated.

[0142] When the range-extended powertrain is in operation, the higher the State of Charge (SOC), the less electricity the range-extended powertrain needs to generate.

[0143] In this case, the torque output by the generator decreases as the SOC increases, reducing the noise and vibration generated by the range-extended powertrain.

[0144] In this embodiment, the need to activate the range-extended powertrain is determined by detecting that the state of charge (SOC) of the electric vehicle's battery is below a threshold. While the range-extended powertrain is operating, a higher SOC results in lower generator output power and less noise and vibration from the powertrain. In this situation, the generator's output torque decreases as the SOC increases, suppressing the reduced noise and vibration. Thus, the generator flexibly adjusts its output torque according to the SOC, actively suppressing the noise and vibration generated by the range-extended powertrain itself, thereby achieving seamless range extension.

[0145] In this embodiment, a mapping relationship can be pre-established between the generator output torque and at least two of the following: electric vehicle speed, power generation, range extender engine output torque, generator speed, and State of Charge (SOC). While the range extender powertrain is operating, the current electric vehicle speed, power generation, range extender engine output torque, generator speed, and SOC are acquired. The generator outputs torque based on this mapping relationship, thereby actively suppressing noise and vibration generated by the range extender powertrain.

[0146] In one embodiment, during the driving process of the electric vehicle at a speed less than or equal to a first preset speed, the generator 111 actively outputs a first torque to the crankshaft during the power generation process; during the driving process of the electric vehicle at a speed greater than the first preset speed but less than a second preset speed and where the power generation of the generator 111 is less than a preset power, the generator 111 actively outputs a second torque to the crankshaft during the power generation process; wherein the average value of the first torque is less than the average value of the second torque.

[0147] Specifically, the first torque can be a constant value when the electric vehicle's speed is greater than a first preset speed but less than a second preset speed and the generator's power output is less than a preset power output, or it can vary with changes in vehicle speed and / or power output. Similarly, the second torque can be a constant value when the electric vehicle's speed is less than or equal to the first preset speed, or it can vary with changes in vehicle speed and / or power output.

[0148] The average values ​​of the first torque and the second torque can be either arithmetic averages or weighted averages.

[0149] When the vehicle speed is greater than the first preset speed but less than the second preset speed (i.e., the electric vehicle is traveling at a medium speed), the masking ability of tire noise, wind noise, and other noises on the noise and vibration of the range-extended powertrain is greater than when the vehicle speed is less than or equal to the first preset speed (i.e., the electric vehicle is traveling at a low speed). Furthermore, when the generator's power output is less than the preset power output, the noise and vibration generated by the range-extended powertrain are relatively small.

[0150] In this embodiment, when the vehicle speed is greater than the first preset speed and less than the second preset speed, and the power generation is less than the preset power, i.e., the electric vehicle is traveling at a medium speed and the power generation is relatively small, the average torque output by the generator during the power generation process is relatively small. Conversely, when the electric vehicle speed is less than or equal to the first preset speed, the average torque output by the generator during the power generation process is relatively large. By making reasonable use of the noise levels such as tire noise and wind noise during the electric vehicle's operation, while also considering the noise and vibration generated by the range-extended powertrain itself, the noise and vibration generated by the range-extended powertrain itself can be suppressed, thereby reducing the energy consumption of the range-extended powertrain while achieving seamless range extension.

[0151] This application provides a control method for a range-extended powertrain, which can be executed by the generator controller 113 provided in the above embodiment.

[0152] This application provides a control method for a range-extended powertrain, which reduces the noise generated by the range-extended powertrain during the operation of an electric vehicle, and includes the following steps.

[0153] During the driving process of an electric vehicle at a speed less than or equal to a first preset speed, the generator controlling the range-extended powertrain actively outputs torque to the crankshaft during the power generation process.

[0154] After the speed of the electric vehicle increases from less than or equal to a first preset speed to greater than or equal to a second preset speed, the generator is controlled to stop outputting torque to the crankshaft during the power generation process.

[0155] For ease of understanding, see Figure 9 , Figure 9 The diagram shows a timing graph of the vehicle speed and the torque output by the generator of an electric vehicle according to an embodiment of this application.

[0156] like Figure 9 As shown, before the first time t1, the speed of the electric vehicle is less than the first preset speed V1, and the generator outputs torque; after the first time t1, the speed of the electric vehicle increases to be greater than the second preset speed V2, and the generator outputs torque decreases to zero.

[0157] In this embodiment, when the electric vehicle's speed is less than or equal to a first preset speed and the range-extended powertrain is generating electricity, the tire noise, wind noise, and other noises of the electric vehicle are relatively low. By controlling the generator of the range-extended powertrain to actively output torque to the crankshaft during the power generation process, the noise and vibration generated by the range-extended powertrain itself are actively suppressed, thereby achieving imperceptible range extension. Furthermore, after the electric vehicle's speed increases from less than or equal to the first preset speed to greater than or equal to the second preset speed, the tire noise, wind noise, and other noises of the electric vehicle increase. The noise and vibration generated by the range-extended powertrain itself are masked by the increased tire noise, wind noise, and other noises. By controlling the generator to stop outputting torque to the crankshaft, the active vibration damping is stopped, avoiding the risk of reduced power generation efficiency due to the generator actively outputting torque, and simultaneously reducing energy consumption.

[0158] In one embodiment, the control method further includes: after the speed of the electric vehicle increases from less than or equal to a first preset speed to greater than the first preset speed and less than a second preset speed, when the power output of the generator is less than the preset power, controlling the generator of the range-extended powertrain to actively output torque to the crankshaft during the power generation process.

[0159] For ease of understanding, see Figure 10 , Figure 10 The illustration shows a timing diagram of the vehicle speed, power generation, and torque output of an electric vehicle according to an embodiment of this application.

[0160] like Figure 10 As shown, before the first time t1, the speed of the electric vehicle is less than the first preset speed V1, so the generator's output torque is controlled at full power without considering the generator's power output. Between the first time t1 and the second time t2, the generator's power output is less than the preset power P, and the speed of the electric vehicle increases to be greater than the first preset speed V1 and less than the second preset speed V2, thus controlling the torque output of the generator. After the second time t2, the generator's power output decreases to be less than the preset power P, thus controlling the torque output of the generator to decrease to zero.

[0161] In this embodiment, after the speed of the electric vehicle increases from less than or equal to the first preset speed to greater than the first preset speed and less than the second preset speed, the force that generates noise and vibration in the range-extended powertrain is periodic and easily canceled out. By controlling the generator of the range-extended powertrain to actively output torque to the crankshaft during the power generation process, the noise and vibration generated by the range-extended powertrain itself are actively suppressed, and the suppression effect is good, improving the comfort and driving experience of the electric vehicle.

[0162] In one embodiment, the control method specifically includes: after the speed of the electric vehicle increases from less than or equal to a first preset speed to greater than or equal to a second preset speed, controlling the torque actively output by the generator to the crankshaft to decrease to zero at a second rate within a first preset duration.

[0163] The first preset duration and the preset duration can be the same or different.

[0164] In this embodiment, after the electric vehicle's speed increases from low to high, the torque output by the generator is controlled to decrease to zero at a second rate. This avoids sudden changes in the generator's torque output that could cause abrupt changes in the stress state of the range-extended powertrain and prevent passengers from experiencing noticeable jerking, thus improving the comfort of the electric vehicle. Furthermore, by setting a first preset duration to limit the rate of decrease in the generator's torque output (i.e., the magnitude of the second rate), excessively high second rates prevent vibration suppression from being canceled too quickly, which could lead to a sharp change in the generated torque, increasing noise and vibration generated by the range-extended powertrain, further improving the comfort of the electric vehicle.

[0165] In one embodiment, the control method specifically includes: during the process of controlling the generator to actively output torque to the crankshaft, controlling the torque output by the generator to increase as the vehicle speed increases.

[0166] In one embodiment, the control method specifically includes: during the process of controlling the generator to actively output torque to the crankshaft, controlling the torque output by the generator to increase as the generator's power output increases.

[0167] It is understood that all relevant content involved in the above-described range-extended powertrain embodiments can be referenced in the embodiments of this control method, and will not be repeated here.

[0168] See Figure 11 , Figure 11 A schematic diagram of a control method for a range-extended powertrain according to an embodiment of this application is shown.

[0169] like Figure 11 As shown, execute S101 to obtain the power generation and speed of the electric vehicle.

[0170] Execute S102 to determine whether active vibration damping is enabled. Determining whether active vibration damping is enabled means determining whether the vehicle speed is greater than a first preset vehicle speed and less than a second preset vehicle speed, or whether the generator's power output is less than a preset power output, or whether the vehicle speed is less than or equal to the first preset vehicle speed.

[0171] If not enabled, return to execute S101.

[0172] If enabled, execute S103 to determine the torque value output by the generator.

[0173] Then, execute S104 to control the generator output torque.

[0174] In another embodiment of this application, an electric vehicle is also provided. The electric vehicle includes a range-extended powertrain and a power battery. The range-extended powertrain is used to generate electricity during the operation of the electric vehicle by utilizing the torque output from the crankshaft of the range-extending engine to charge the power battery of the electric vehicle or drive the wheels of the electric vehicle, wherein:

[0175] When the electric vehicle is traveling at a speed less than or equal to a first preset speed, the generator of the range extender powertrain actively outputs torque to the crankshaft during the power generation process; when the electric vehicle is traveling at a speed greater than or equal to a second preset speed, the generator stops outputting torque to the crankshaft during the power generation process, and the second preset speed is greater than the first preset speed.

[0176] It is understood that all relevant content related to the above-described range-extended powertrain and control method can be applied to the embodiments of the electric vehicle, and will not be repeated here.

[0177] Finally, it should be noted that the above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope 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 range-extended powertrain, characterized in that, The range-extended powertrain is used to generate electricity during the operation of the electric vehicle by utilizing the torque output from the crankshaft of the range-extending engine to charge the electric vehicle's power battery or drive the wheels of the electric vehicle, wherein: During the driving process of the electric vehicle at a speed less than or equal to a first preset speed, the generator of the range-extended powertrain actively outputs torque to the crankshaft during the power generation process. During the operation of the electric vehicle at a speed greater than or equal to the second preset speed, the generator stops outputting torque to the crankshaft during the power generation process, and the second preset speed is greater than the first preset speed.

2. The range-extended powertrain according to claim 1, characterized in that, During the operation of the electric vehicle at a speed greater than the first preset speed and less than the second preset speed, when the power output of the generator is less than the preset power, the generator actively outputs torque to the crankshaft during the power generation process.

3. The range-extended powertrain according to claim 1 or 2, characterized in that, During the operation of the electric vehicle at a speed greater than the first preset speed and less than the second preset speed, when the power output of the generator is greater than or equal to the preset power, the generator stops outputting torque to the crankshaft during the power generation process.

4. The range-extended powertrain according to claim 1, characterized in that, During the process of the generator actively outputting torque to the crankshaft, the torque actively output by the generator changes with the position angle of the rotor.

5. The range-extended powertrain according to claim 1, characterized in that, During the process of the generator actively outputting torque to the crankshaft, the torque actively output by the generator changes with the torque output by the range extender engine.

6. The range-extended powertrain according to any one of claims 1-5, characterized in that, During the operation of the electric vehicle, when the speed of the electric vehicle decreases from greater than or equal to the second preset speed to less than or equal to the first preset speed, the torque actively output by the generator to the crankshaft increases to a preset value at a first rate within a preset time period.

7. The range-extended powertrain according to any one of claims 1-5, characterized in that, During the process of the generator actively outputting torque to the crankshaft, the torque output by the generator increases with the increase of the vehicle speed.

8. The range-extended powertrain according to any one of claims 1-5, characterized in that, During the process of the generator actively outputting torque to the crankshaft, the torque output by the generator increases as the generator's power output increases.

9. The range-extended powertrain according to any one of claims 1-5, characterized in that, When the state of charge (SOC) of the power battery of the electric vehicle is less than a threshold, the torque output by the generator decreases as the SOC increases.

10. The range-extended powertrain according to claim 2 or 3, characterized in that, During the driving process of the electric vehicle at a speed less than or equal to the first preset speed, the generator actively outputs a first torque to the crankshaft during the power generation process; During the driving process where the electric vehicle's speed is greater than the first preset speed, less than the second preset speed, and the generator's power output is less than the preset power, the generator actively outputs a second torque to the crankshaft during the power generation process. The average value of the first torque is less than the average value of the second torque.

11. The range-extended powertrain according to any one of claims 1-10, characterized in that, The direction of the torque actively output by the generator to the crankshaft is opposite to the direction of the torque output by the range extender engine.

12. A control method for a range-extended powertrain, characterized in that, The control method is used to reduce the noise generated by the range-extended powertrain during the operation of the electric vehicle, and the control method includes: During the driving process of the electric vehicle at a speed less than or equal to a first preset speed, the generator of the range-extended powertrain is controlled to actively output torque to the crankshaft during the power generation process; After the speed of the electric vehicle increases from less than or equal to the first preset speed to greater than or equal to the second preset speed, the generator is controlled to stop outputting torque to the crankshaft during the power generation process.

13. The control method according to claim 12, characterized in that, The control method includes: After the speed of the electric vehicle increases from less than or equal to the first preset speed to greater than the first preset speed and less than the second preset speed, when the power output of the generator is less than the preset power, the generator of the range-extended powertrain is controlled to actively output torque to the crankshaft during the power generation process.

14. The control method according to claim 12, characterized in that, The control method includes: During the process of controlling the generator to actively output torque to the crankshaft, the torque output by the generator is controlled to increase as the vehicle speed increases.

15. An electric vehicle, characterized in that, The electric vehicle includes a range-extended powertrain and a power battery. The range-extended powertrain is used to generate electricity during the electric vehicle's operation using the torque output from the crankshaft of the range-extending engine to charge the electric vehicle's power battery or drive the electric vehicle's wheels, wherein: During the driving process of the electric vehicle at a speed less than or equal to a first preset speed, the generator of the range-extended powertrain actively outputs torque to the crankshaft during the power generation process. During the operation of the electric vehicle at a speed greater than or equal to the second preset speed, the generator stops outputting torque to the crankshaft during the power generation process, and the second preset speed is greater than the first preset speed.

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