Power compensation method and device for range-extended hybrid power systems

Abstract

This invention proposes a power compensation method and apparatus for a range-extended hybrid power system. The method includes: responding to the battery's power supply state, the vehicle is driven by the battery, and based on changes in vehicle speed, it is determined whether power compensation unit drives the electric motor for power compensation; responding to a first battery depletion state, the range extender is activated, and based on the vehicle's power demand, changes in vehicle speed, and the remaining energy stored in the power compensation unit, the power compensation unit or the battery-driven electric motor is controlled for power compensation; responding to a second battery depletion state, the vehicle enters limp mode, and based on the vehicle's power demand and changes in vehicle speed, the power compensation unit or the range extender-driven electric motor is controlled for power compensation. This achieves power compensation under different battery SOC states, reduces battery over-discharge scenarios, and solves the problem of acceleration performance degradation in range-extended hybrid power systems.

Description

Technical Field

[0001] This invention relates to the field of range-extended vehicle technology, and more particularly to a power compensation method and apparatus for a range-extended hybrid power system. Background Technology

[0002] Range-extended electric vehicles (REEVs) are a transitional product in the transformation from traditional gasoline vehicles to new energy vehicles. In related technologies, traditional REEVs rely on a single battery for power supply. Frequent deep charging and discharging accelerates the damage to the battery electrode material structure. In addition, the acceleration performance of traditional REEVs decreases when the battery is depleted, and the internal resistance voltage drop increases significantly when the battery discharges at high current during acceleration. Under high current pulse conditions, lithium-ion batteries may undergo lithium plating, resulting in over-discharge of the battery and a decline in the acceleration performance of REEVs. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, the first objective of this invention is to propose a power compensation method for a range-extended hybrid power system, which realizes power compensation under different battery SOC states, reduces the scenario of battery over-discharge, and solves the problem of acceleration performance degradation in range-extended hybrid power systems.

[0005] The second objective of this invention is to provide a power compensation device for a range-extended hybrid power system.

[0006] The third objective of this invention is to provide an electronic device.

[0007] The fourth objective of this invention is to provide a non-transitory computer-readable storage medium storing computer instructions.

[0008] To achieve the above objectives, a first aspect of the present invention provides a power compensation method for a range-extended hybrid power system. The range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender. The method includes:

[0009] Based on different power threshold ranges of battery SOC, the power supply state, first power supply state and second power supply state of the battery are determined.

[0010] In response to the power supply state, the vehicle is driven by the battery, and based on the vehicle speed change state, it is determined whether the power compensation unit needs to drive the motor to provide the power required to compensate for the vehicle speed change.

[0011] In response to the first power supply state, the range extender is started, and based on the vehicle's power demand, the vehicle speed change state, and the remaining energy stored in the power compensation unit, the power compensation unit or the battery drive motor is controlled to provide the power required to compensate for the vehicle speed change.

[0012] In response to the second power supply state, the vehicle enters limp mode and, based on the vehicle's power demand and speed change status, controls the power compensation unit or the range extender drive motor to provide the power required to compensate for the vehicle speed change.

[0013] To achieve the above objectives, a second aspect of the present invention provides a power compensation device for a range-extended hybrid power system. The range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender. The device includes:

[0014] The determination module is used to determine the battery's power supply state, first power supply state, and second power supply state based on different power threshold ranges of the battery's SOC.

[0015] The first control module is used to respond to the power supply state, the vehicle is driven by the battery, and based on the vehicle speed change state, determine whether it is necessary to control the power compensation unit to drive the motor to provide the power required to compensate the vehicle speed change.

[0016] The second control module is used to start the range extender in response to the first power supply state, and control the power compensation unit or the battery drive motor to provide the power required to compensate for the vehicle speed change based on the vehicle's power demand, the vehicle speed change state and the remaining energy of the power compensation unit.

[0017] The third control module is used to respond to the second power supply state, when the vehicle enters limp mode, and to control the power compensation unit or the range extender drive motor to provide the power required to compensate for the vehicle speed change based on the vehicle's power demand and the vehicle speed change state.

[0018] To achieve the above objectives, a third aspect of the present invention provides an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method described in the first aspect.

[0019] To achieve the above objectives, a fourth aspect of the present invention provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to perform the method described in the first aspect.

[0020] This invention provides a power compensation method, apparatus, electronic device, and storage medium for a range-extended hybrid power system. The range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender. Based on different battery SOC threshold ranges, the system determines the battery's power supply state, a first depletion state, and a second depletion state. In response to the battery's power supply state, the vehicle is driven by the battery, and based on changes in vehicle speed, it is determined whether the power compensation unit needs to drive the electric motor for power compensation. In response to the first depletion state of the battery, the range extender is activated, and based on the vehicle's power demand, changes in vehicle speed, and the remaining energy stored in the power compensation unit, the system controls either the power compensation unit or the battery to drive the electric motor for power compensation. In response to the second depletion state of the battery, the vehicle enters limp mode, and based on the vehicle's power demand and changes in vehicle speed, the system controls either the power compensation unit or the range extender to drive the electric motor for power compensation. This achieves power compensation under different battery SOC states, reduces battery over-discharge scenarios, and solves the problem of acceleration performance degradation in range-extended hybrid power systems.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 This is a flowchart illustrating the power compensation method based on a range-extended hybrid power system according to the first embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the range-extended hybrid power system structure shown in the second embodiment of the present invention;

[0025] Figure 3 This is a flowchart illustrating the power compensation method for a range-extended hybrid power system according to the third embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the power compensation device of the range-extended hybrid power system shown in the fourth embodiment of the present invention. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] It should be noted that the acquisition, storage, use, and processing of data in the technical solution of this invention all comply with the relevant provisions of relevant laws and regulations.

[0029] The power compensation method and apparatus for a range-extended hybrid power system according to embodiments of the present invention are described below with reference to the accompanying drawings.

[0030] Figure 1 This is a flowchart illustrating a power compensation method for a range-extended hybrid power system provided in an embodiment of the present invention. The range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender. Figure 2 As shown, Figure 2 This is a schematic diagram of the range-extended hybrid power system structure shown in the second embodiment of the present invention. Specifically, the two ends of the battery, power compensation unit, and range extender are electrically connected to the positive and negative terminals of the electric motor (drive motor), respectively. The battery and range extender are electrically connected to the DC converter and then connected to the branch controller (e.g., a switching valve). After the battery and range extender are stepped down by the DC converter, the branch controller charges the power compensation unit. In addition, the power compensation unit can also be discharged through the branch controller, and then stepped up by the electrically connected DC converter to drive the electric motor.

[0031] Among them, such as Figure 2 As shown, the battery is managed and maintained by a Battery Management System (BMS), the power compensation unit is managed and maintained by an Energy Storage Management System (e.g., EMS), and the range extender is managed and maintained by a Range Extender Management System. Each DC-DC converter, branch controller, Range Extender Management System, Energy Storage Management System, BMS, and motor is managed and maintained by a central controller (e.g., an Electronic Control Unit (ECU). The motor is connected to the central controller, each DC converter to the central controller, branch controllers to the central controller, the Range Extender Management System to the central controller, the Energy Storage Management System to the central controller, the BMS to the central controller, the battery to the BMS, the power compensation unit to the Energy Storage Management System, the Range Extender Management System to the Range Extender, and the BMS to both the Energy Storage Management System and the Range Extender Management System, as well as to the Energy Storage Management System and the Range Extender Management System, respectively. Thus, a branch controller group is used to achieve dynamic direct connection of multiple energy sources. Both the range extender and the battery can directly charge the power compensation unit, and multi-state, multi-level power supply and compensation functions are achieved through the branch controllers and multi-layer DC converters.

[0032] like Figure 1 As shown, the method includes the following steps:

[0033] Step 101: Based on different power threshold intervals of the battery SOC, determine the power supply state, the first power feeding state, and the second power feeding state of the battery.

[0034] In some possible implementation manners, based on different power threshold intervals of the battery SOC, determining the power supply state, the first power feeding state, and the second power feeding state of the battery includes: determining the first power feeding state and the second power feeding state of the battery, where when the SOC is greater than the first power threshold and less than or equal to the second power threshold, it belongs to the first power feeding state, and when the SOC is less than or equal to the first power threshold, it belongs to the second power feeding state; determining the power supply state of the battery, where when the SOC is greater than the second power threshold, it belongs to the power supply state, and the second power threshold is greater than the first power threshold, so as to achieve an accurate division of the battery state.

[0035] Optionally, the first power threshold can be set to 5% of the battery power, and the second power threshold can be set to 20% of the battery power, but it is not limited thereto, and this embodiment does not make specific limitations on this.

[0036] Furthermore, when the SOC is less than or equal to 5% of the battery power (SOC≤5%), it belongs to the first power feeding state, and the first power feeding state is that the battery is completely power fed; when the SOC is greater than 5% of the battery power and less than or equal to 20% of the battery power (5%<SOC≤20%), it belongs to the second power feeding state, and the second power feeding state is that the battery is incompletely power fed; when the SOC is greater than 20% of the battery power (SOC>20%), it belongs to the power supply state.

[0037] Step 102: In response to the power supply state, the vehicle is driven by the battery, and based on the vehicle speed change state, determine whether it is necessary to control the power compensation unit to drive the motor to compensate the power required by the vehicle for the vehicle speed change.

[0038] In some possible implementations, in response to a power supply state, the vehicle is driven by the battery, and based on the vehicle speed change state, it is determined whether the power compensation unit needs to be controlled to drive the electric motor to compensate for the power required by the vehicle speed change. This includes: in response to a power supply state, the vehicle is driven by the battery, and when the vehicle speed change state is a first speed change state, the battery alone supplies power to the vehicle, controlling the power required by the battery-driven electric motor to drive the vehicle; in response to a power supply state, the vehicle is driven by the battery, and when the vehicle speed change state is a second speed change state, the power compensation unit is controlled to discharge to drive the electric motor to compensate for the first differential power required by the vehicle speed change; wherein, the second speed change state is the vehicle state corresponding to when the vehicle speed changes by a number of degrees within a time interval greater than a set number of degree change threshold, and the first speed change state is the vehicle state corresponding to when the number of degrees of change within a time interval is less than or equal to the set number of degree change threshold. Thus, the power compensation device can mitigate voltage fluctuations, ensure that the range-extended hybrid system continuously obtains stable power output, and guarantee the normal acceleration operation of the vehicle.

[0039] As an example, when transitioning from the second speed change state to the first speed change state, the power compensation unit is charged via the battery.

[0040] It should be noted that the first speed change state can be the vehicle's constant speed state, and the second speed change state can be the vehicle's rapid acceleration state.

[0041] A power compensation unit is a device used to improve the power factor of the power grid and reduce reactive power loss. It is used to improve power quality and reduce energy waste. Specifically, it has the ability to discharge quickly, have high capacity, stable performance, and be suitable for frequent charging and discharging. Its relatively small size can meet the rapid acceleration discharge needs of vehicles for a certain period of time.

[0042] Step 103: In response to the first power supply state, start the range extender, and based on the vehicle's power demand, the vehicle speed change state, and the remaining energy stored in the power compensation unit, control the power compensation unit or the battery drive motor to provide the power required to compensate for the vehicle speed change.

[0043] In some possible implementations, in response to a first power-out state, the range extender is activated, and based on the vehicle's power demand, the vehicle speed change state, and the remaining energy stored in the power compensation unit, the power supply unit or battery drive motor is controlled to supply the power required to compensate for the vehicle speed change. This includes: in response to the first power-out state, activating the range extender, and when the vehicle's power demand is less than or equal to the maximum output power of the range extender, controlling the range extender drive motor to supply the vehicle with the vehicle's power demand; and in response to the first power-out state, activating the range extender, and when the vehicle's power demand is greater than the maximum output power of the range extender, and the vehicle speed change state is a first speed change. In the case of speed change, the control battery supplies power to drive the electric motor to compensate for the second power difference between the vehicle's required power and the range extender's maximum output power; in response to the first power failure state, the range extender is started, and when the vehicle's required power is greater than the range extender's maximum output power and the vehicle speed change state is the second speed change state, the power compensation unit or battery is controlled to discharge based on the remaining energy stored in the power compensation unit to drive the electric motor to compensate for the second power difference between the vehicle's required power and the range extender's maximum output power. Thus, voltage fluctuations can be mitigated through the power compensation device or battery, improving the acceleration performance of the range-extended vehicle.

[0044] In some other possible implementations, in response to a first power-off state, the range extender is activated, and when the vehicle's power demand exceeds the range extender's maximum output power and the vehicle speed change state is a second speed change state, the power compensation unit is controlled to discharge, and it is determined whether the remaining energy stored in the power compensation unit is depleted; if the remaining energy stored in the power compensation unit is depleted, power is supplied through battery compensation to drive the electric motor to compensate for the second power difference between the vehicle's power demand and the range extender's maximum output power; if the remaining energy stored in the power compensation unit is not depleted, the power compensation unit is discharged to drive the electric motor to compensate for the second power difference between the vehicle's power demand and the range extender's maximum output power, thereby improving the acceleration performance of the range-extended vehicle.

[0045] As an example, if the vehicle's power demand is still greater than the range extender's maximum output power after the second power difference is compensated, the battery will increase its output power to compensate for the second power difference; if the vehicle's power demand is less than or equal to the range extender's maximum output power after the second power difference is compensated, the battery will charge the power compensation unit.

[0046] A range extender is a device that uses a combination of an engine and a generator to provide additional electrical energy to a vehicle, thereby extending its driving range. When the vehicle's battery SOC falls below a set threshold, the range extender automatically starts generating electricity to charge the battery.

[0047] Step 104: In response to the second power supply state, the vehicle enters limp mode, and based on the vehicle's power demand and speed change status, controls the power compensation unit or range extender drive motor to provide the power required to compensate for the vehicle speed change.

[0048] In some possible implementations, in response to a second power-off state, the vehicle enters a limp-mode, and based on the vehicle's power demand and speed change state, controls the power compensation unit or the range extender drive motor to compensate for the power required to compensate for the vehicle speed change. This includes: in response to a second power-off state, the vehicle enters a limp-mode, and when the vehicle's power demand is less than or equal to the range extender's maximum output power, controlling the range extender drive motor to drive the vehicle with the vehicle's power demand obtained from the vehicle's power demand; in response to a second power-off state, the vehicle enters a limp-mode, and when the vehicle's power demand is greater than the range extender's maximum output power and the vehicle speed change state is a first speed change state, driving the vehicle with a preset safe operating power; in response to a second power-off state, the vehicle enters a limp-mode, and when the vehicle's power demand is greater than the range extender's maximum output power and the vehicle speed change state is a second speed change state, controlling the power compensation unit to discharge, so as to drive the motor to compensate for the second power difference between the vehicle's power demand and the range extender's maximum output power. Thus, the power compensation device can mitigate voltage fluctuations, ensuring that the range-extended hybrid system continuously obtains stable power output, and enabling rapid acceleration operation of the small range-extended hybrid system after complete power depletion.

[0049] As an example, when the second speed change state transitions to the first speed change state, the system returns to limp mode and charges the power compensation unit via the range extender. The remaining power after the range extender charges the power compensation unit is then used to charge the battery.

[0050] Among them, entering limp mode is an emergency protection mechanism that is activated when the vehicle's electronic control system malfunctions. By limiting the vehicle's power output and driving speed, it ensures that the vehicle can travel at a low speed to the repair point. For example, speed limit: the maximum vehicle speed is limited to the range of 9-20 km / h; power limit: the engine power and torque are greatly reduced, and the throttle response is sluggish; gear limit: the transmission is locked in a fixed gear.

[0051] This invention discloses a power compensation method for a range-extended hybrid power system. The range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender. Based on different battery SOC threshold ranges, the method determines the battery's power supply state, a first depletion state, and a second depletion state. In response to the battery's power supply state, the vehicle is driven by the battery, and based on changes in vehicle speed, it is determined whether the power compensation unit needs to drive the electric motor for power compensation. In response to the first depletion state of the battery, the range extender is activated, and based on the vehicle's power demand, changes in vehicle speed, and the remaining energy stored in the power compensation unit, the method controls either the power compensation unit or the battery to drive the electric motor for power compensation. In response to the second depletion state of the battery, the vehicle enters a limp-riding mode, and based on the vehicle's power demand and changes in vehicle speed, the method controls either the power compensation unit or the range extender to drive the electric motor for power compensation. This achieves power compensation under different battery SOC states, reduces battery over-discharge scenarios, and solves the problem of acceleration performance degradation in range-extended hybrid power systems.

[0052] To clearly illustrate the previous embodiment, this embodiment also provides an implementation example diagram of the power compensation method for a range-extended hybrid power system, as shown below. Figure 3 As shown, specifically, the battery SOC state is obtained. When SOC > 20%, in response to the power supply state, the vehicle is driven by the battery (operating in pure electric mode). When the vehicle speed change state is not a rapid acceleration state, the battery alone supplies power to the vehicle, and the vehicle is driven by the power required by the battery-driven motor. When the vehicle speed change state is a rapid acceleration state, the power compensation unit is controlled to discharge to drive the motor to compensate for the first power difference required by the vehicle speed change. When the acceleration of the rapid acceleration state ends (for example, the rapid acceleration state of the vehicle changes to a constant speed state), the power compensation unit is charged by the battery.

[0053] like Figure 3As shown, specifically, when 5% < SOC ≤ 20%, in response to the first power supply state, the range extender is started, and when the vehicle demand power is less than or equal to the maximum output power of the range extender, the vehicle is controlled to be driven by the vehicle demand power obtained by the range extender driving the motor; when the vehicle demand power is greater than the maximum output power of the range extender and the vehicle speed change state is not a vehicle rapid acceleration state (for example, the vehicle is in a constant speed state), the battery is controlled to supply power to drive the motor to compensate for the second power difference between the vehicle demand power and the maximum output power of the range extender; when the vehicle demand power is greater than the maximum output power of the range extender, the vehicle speed change state is a vehicle rapid acceleration state, and the remaining energy storage of the power compensation unit is emptied, power supply is carried out through battery compensation to drive the motor to compensate for the second power difference between the vehicle demand power and the maximum output power of the range extender; when the vehicle demand power is greater than the maximum output power of the range extender, the vehicle speed change state is a vehicle rapid acceleration state, and the remaining energy storage of the power compensation unit is not emptied, the power compensation unit is discharged to drive the motor to compensate for the second power difference between the vehicle demand power and the maximum output power of the range extender; after compensating for the second power difference, when the vehicle demand power is less than or equal to the maximum output power of the range extender (for example, the vehicle demand power decreases), the battery is controlled to charge the power compensation unit.

[0054] As Figure 3 shown, specifically, when SOC ≤ 5%, in response to the second power supply state, the vehicle enters the limp mode, and when the vehicle demand power is less than or equal to the maximum output power of the range extender, the vehicle is controlled to be driven by the vehicle demand power obtained by the range extender driving the motor; when the vehicle demand power is greater than the maximum output power of the range extender and the vehicle speed change state is not a vehicle rapid acceleration state (for example, the vehicle is in a constant speed state), the vehicle is driven at a preset vehicle safe operating power (i.e., power limited operation); when the vehicle demand power is greater than the maximum output power of the range extender and the vehicle speed change state is a vehicle rapid acceleration state, the power compensation unit is controlled to discharge to drive the motor to compensate for the second power difference between the vehicle demand power and the maximum output power of the range extender; and when the acceleration of the vehicle rapid acceleration state ends (for example, the vehicle rapid acceleration state changes to the vehicle constant speed state), the limp mode is returned, and the range extender is used to charge the power compensation unit.

[0055] In summary, through the coordinated control of the battery, the power compensation unit that discharges, and the range extender, the scenario of over-discharging the battery is reduced, and the problem that the acceleration performance decays when the range-extended hybrid power system is fully powered off is solved.

[0056] To implement the above embodiments, the present invention also proposes a power compensation device for a range-extended hybrid power system.

[0057] Figure 4This is a schematic diagram of the structure of a power compensation device for a range-extended hybrid power system provided in an embodiment of the present invention. The range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender.

[0058] like Figure 4 As shown, the power compensation device 40 of the range-extended hybrid power system includes: a determination module 41, a first control module 42, a second control module 43, and a third control module 44.

[0059] The determination module 41 is used to determine the power supply state, the first power supply state, and the second power supply state of the battery based on different power threshold ranges of the battery SOC.

[0060] The first control module 42 is used to respond to the power supply state, the vehicle is driven by the battery, and based on the vehicle speed change state, determine whether it is necessary to control the power compensation unit to drive the motor to provide the power required to compensate the vehicle speed change.

[0061] The second control module 43 is used to start the range extender in response to the first power supply state, and control the power compensation unit or the battery drive motor to provide the power required to compensate for the vehicle speed change based on the vehicle's power demand, the vehicle speed change state and the remaining energy of the power compensation unit.

[0062] The third control module 44 is used to respond to the second power supply state, when the vehicle enters limp mode, and to control the power compensation unit or the range extender drive motor to provide the power required to compensate for the vehicle speed change based on the vehicle's power demand and the vehicle speed change state.

[0063] Furthermore, in one possible implementation of this invention, the determining module 41 is specifically used for:

[0064] The first and second power-off states of the battery are determined, wherein the first power-off state is when the SOC is greater than the first power threshold and less than or equal to the second power threshold, and the second power-off state is when the SOC is less than or equal to the first power threshold.

[0065] The power supply status of the battery is determined, wherein the battery is in a power supply state when the SOC is greater than the second power threshold, and the second power threshold is greater than the first power threshold.

[0066] Furthermore, in one possible implementation of this invention, the first control module 42 is specifically used for:

[0067] In response to the power supply state, the vehicle is driven by the battery, and when the vehicle speed change state is the first speed change state, the battery alone supplies power to the vehicle, and the vehicle drives the vehicle with the power required by the battery-driven motor.

[0068] In response to the power supply state, the vehicle is driven by the battery, and when the vehicle speed change state is the second speed change state, the power compensation unit is controlled to discharge in order to drive the motor to compensate for the first difference power required for the vehicle speed change.

[0069] The second speed change state is the vehicle state when the speed changes by a factor of magnitude within a time interval, which is greater than a set factor of magnitude change threshold. The first speed change state is the vehicle state when the speed changes by a factor of magnitude within a time interval, which is less than or equal to a set factor of magnitude change threshold.

[0070] Furthermore, in one possible implementation of this invention, the apparatus further includes:

[0071] The first charging module is used to charge the power compensation unit via the battery when the second speed change state is converted to the first speed change state.

[0072] Furthermore, in one possible implementation of this invention, the second control module 43 is specifically used for:

[0073] In response to the first power supply state, the range extender is started, and when the vehicle's required power is less than or equal to the maximum output power of the range extender, the range extender drive motor is controlled to drive the vehicle with the required power.

[0074] In response to the first power supply state, the range extender is started, and when the vehicle's required power is greater than the range extender's maximum output power and the vehicle's speed change state is the first speed change state, the battery is controlled to supply power to drive the electric motor to compensate for the second power difference between the vehicle's required power and the range extender's maximum output power.

[0075] In response to the first power supply state, the range extender is started, and when the vehicle's required power is greater than the range extender's maximum output power and the vehicle's speed change state is the second speed change state, the power compensation unit or battery is controlled to discharge based on the remaining energy stored in the power compensation unit, so as to drive the motor to compensate for the second power difference between the vehicle's required power and the range extender's maximum output power.

[0076] Furthermore, in one possible implementation of this invention, the second control module 43 is further specifically used for:

[0077] In response to the first power supply state, the range extender is started, and when the vehicle's required power is greater than the range extender's maximum output power and the vehicle's speed change state is the second speed change state, the power compensation unit is controlled to discharge, and it is determined whether the remaining energy stored in the power compensation unit is depleted.

[0078] When the remaining energy storage of the power compensation unit is depleted, power is supplied through battery compensation to drive the electric motor to compensate for the second power difference between the vehicle's required power and the maximum output power of the range extender.

[0079] If the remaining energy stored in the power compensation unit is not depleted, the power compensation unit discharges to drive the electric motor to compensate for the second power difference between the vehicle's required power and the range extender's maximum output power.

[0080] Furthermore, in one possible implementation of this invention, the apparatus further includes:

[0081] The fourth control module is used to control the battery to increase its output power to compensate for the second power difference if the vehicle's required power is still greater than the range extender's maximum output power after the second power difference has been compensated.

[0082] The second charging module is used to control the battery to charge the power compensation unit when the vehicle's required power is less than or equal to the maximum output power of the range extender after the second power difference has been compensated.

[0083] Furthermore, in one possible implementation of this invention, the third control module 44 is specifically used for:

[0084] In response to the second power supply state, the vehicle enters limp mode and drives the vehicle with the vehicle demand power obtained by the range extender drive motor when the vehicle demand power is less than or equal to the maximum output power of the range extender.

[0085] In response to the second power supply state, the vehicle enters limp mode and drives the vehicle at a preset safe operating power when the vehicle's power demand is greater than the range extender's maximum output power and the vehicle speed change state is the first speed change state.

[0086] In response to the second power supply state, the vehicle enters limp mode, and when the vehicle's power demand is greater than the range extender's maximum output power and the vehicle speed change state is the second speed change state, the power compensation unit is controlled to discharge so as to drive the motor to compensate for the second power difference between the vehicle's power demand and the range extender's maximum output power.

[0087] Furthermore, in one possible implementation of this invention, the apparatus further includes:

[0088] The third charging module is used to return to limp mode when the second speed change state changes to the first speed change state, and to charge the power compensation unit through the range extender. The remaining power after the range extender charges the power compensation unit is used to charge the battery.

[0089] It should be noted that the foregoing explanation of the method embodiments also applies to the apparatus of this embodiment, and will not be repeated here.

[0090] This invention discloses a power compensation device for a range-extended hybrid power system. The range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender. Based on different battery SOC threshold ranges, the device determines the battery's power supply state, a first depletion state, and a second depletion state. In response to the battery's power supply state, the vehicle is driven by the battery, and based on changes in vehicle speed, it is determined whether the power compensation unit needs to drive the electric motor for power compensation. In response to the first depletion state of the battery, the range extender is activated, and based on the vehicle's power demand, changes in vehicle speed, and the remaining energy stored in the power compensation unit, the device controls either the power compensation unit or the battery to drive the electric motor for power compensation. In response to the second depletion state of the battery, the vehicle enters a limp-riding mode, and based on the vehicle's power demand and changes in vehicle speed, the device controls either the power compensation unit or the range extender to drive the electric motor for power compensation. This achieves power compensation under different battery SOC states, reduces battery over-discharge scenarios, and solves the problem of acceleration performance degradation in range-extended hybrid power systems.

[0091] To achieve the above embodiments, the present invention also proposes an electronic device, comprising:

[0092] At least one processor; and

[0093] A memory communicatively connected to the at least one processor; wherein,

[0094] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the aforementioned method.

[0095] To implement the above embodiments, the present invention also proposes a non-transitory computer-readable storage medium storing computer instructions for causing the computer to perform the aforementioned method.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0097] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0098] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0099] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0100] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0101] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0102] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0103] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A power compensation method for a range-extended hybrid power system, characterized in that, The range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender, and the method includes: Based on different power threshold ranges of battery SOC, the power supply state, first power supply state and second power supply state of the battery are determined. In response to the power supply state, the vehicle is driven by the battery, and based on the vehicle speed change state, it is determined whether the power compensation unit needs to drive the motor to provide the power required to compensate for the vehicle speed change. In response to the first power supply state, the range extender is started, and based on the vehicle's power demand, the vehicle speed change state, and the remaining energy stored in the power compensation unit, the power compensation unit or the battery drive motor is controlled to provide the power required to compensate for the vehicle speed change. In response to the second power supply state, the vehicle enters limp mode and controls the power compensation unit or range extender drive motor to provide the power required to compensate for the vehicle speed change based on the vehicle's power demand and vehicle speed change status. The determination of the battery's power supply state, first power supply state, and second power supply state based on different battery SOC power threshold ranges includes: The first and second power supply states of the battery are determined, wherein the first power supply state is when the SOC is greater than the first power threshold and less than or equal to the second power threshold, and the second power supply state is when the SOC is less than or equal to the first power threshold. Determine the battery's power supply status, where the state of charge (SOC) is greater than a second power threshold, and the second power threshold is greater than a first power threshold. In response to the power supply state, the vehicle is driven by the battery, and based on the vehicle speed change state, it is determined whether the power compensation unit needs to drive the motor to provide power to compensate for the vehicle speed change, including: In response to the power supply state, the vehicle is driven by the battery, and when the vehicle speed change state is the first speed change state, the battery alone supplies power to the vehicle, and the vehicle drives the vehicle with the power required by the battery-driven motor. In response to the power supply state, the vehicle is driven by the battery, and when the vehicle speed change state is the second speed change state, the power compensation unit is controlled to discharge in order to drive the motor to compensate for the first difference power required for the vehicle speed change. The second speed change state is the vehicle state when the speed change within a time interval is greater than a set speed change threshold, and the first speed change state is the vehicle state when the speed change within a time interval is less than or equal to the set speed change threshold.

2. The power compensation method for a range-extended hybrid power system according to claim 1, characterized in that, The method further includes: When the second speed change state transitions to the first speed change state, the power compensation unit is charged via the battery.

3. The power compensation method for a range-extended hybrid power system according to claim 1, characterized in that, In response to the first power supply state, the range extender is activated, and based on the vehicle's power demand, vehicle speed change status, and remaining energy storage of the power compensation unit, the power compensation unit or battery drive motor is controlled to provide the power required to compensate for the vehicle speed change, including: In response to the first power supply state, the range extender is started, and when the vehicle's required power is less than or equal to the maximum output power of the range extender, the range extender drive motor is controlled to drive the vehicle with the required power. In response to the first power supply state, the range extender is started, and when the vehicle's required power is greater than the range extender's maximum output power and the vehicle's speed change state is the first speed change state, the battery is controlled to supply power to drive the electric motor to compensate for the second power difference between the vehicle's required power and the range extender's maximum output power. In response to the first power supply state, the range extender is started, and when the vehicle's required power is greater than the range extender's maximum output power and the vehicle's speed change state is the second speed change state, the power compensation unit or battery is controlled to discharge based on the remaining energy stored in the power compensation unit, so as to drive the motor to compensate for the second power difference between the vehicle's required power and the range extender's maximum output power.

4. The power compensation method for a range-extended hybrid power system according to claim 1, characterized in that, In response to the first power supply state, the range extender is activated, and when the vehicle's power demand exceeds the range extender's maximum output power and the vehicle speed change state is a second speed change state, the power compensation unit or battery is controlled to discharge based on the remaining energy stored in the power compensation unit to drive the electric motor to compensate for the second power difference between the vehicle's power demand and the range extender's maximum output power, including: In response to the first power supply state, the range extender is started, and when the vehicle's required power is greater than the range extender's maximum output power and the vehicle's speed change state is the second speed change state, the power compensation unit is controlled to discharge, and it is determined whether the remaining energy stored in the power compensation unit is depleted. When the remaining energy storage of the power compensation unit is depleted, power is supplied through battery compensation to drive the electric motor to compensate for the second power difference between the vehicle's required power and the maximum output power of the range extender. If the remaining energy stored in the power compensation unit is not depleted, the power compensation unit discharges to drive the electric motor to compensate for the second power difference between the vehicle's required power and the range extender's maximum output power.

5. The power compensation method for a range-extended hybrid power system according to claim 4, characterized in that, The method further includes: After compensating for the second power difference, the vehicle's power demand is still greater than the range extender's maximum output power, so the battery is controlled to increase its output power to compensate for the second power difference. After compensating for the second power difference, the vehicle's power demand is less than or equal to the range extender's maximum output power, and the battery is controlled to charge the power compensation unit.

6. The power compensation method for a range-extended hybrid power system according to claim 1, characterized in that, In response to the second power supply state, the vehicle enters limp mode, and based on the vehicle's power demand and speed change status, controls the power compensation unit or range extender drive motor to provide the power required to compensate for the vehicle speed change, including: In response to the second power supply state, the vehicle enters limp mode and drives the vehicle with the vehicle demand power obtained by the range extender drive motor when the vehicle demand power is less than or equal to the maximum output power of the range extender. In response to the second power supply state, the vehicle enters limp mode and drives the vehicle at a preset safe operating power when the vehicle's power demand is greater than the range extender's maximum output power and the vehicle speed change state is the first speed change state. In response to the second power supply state, the vehicle enters limp mode, and when the vehicle's power demand is greater than the range extender's maximum output power and the vehicle speed change state is the second speed change state, the power compensation unit is controlled to discharge so as to drive the motor to compensate for the second power difference between the vehicle's power demand and the range extender's maximum output power.

7. The power compensation method for a range-extended hybrid power system according to claim 6, characterized in that, The method further includes: When the second speed change state transitions to the first speed change state, the system returns to limp mode and charges the power compensation unit via the range extender. The remaining charge after the range extender charges the power compensation unit is then used to charge the battery.

8. A power compensation device for a range-extended hybrid power system, characterized in that, A range-extended hybrid power system includes a battery, an electric motor, a power compensation unit for discharging, and a range extender. The device includes: The determination module is used to determine the battery's power supply state, first power supply state, and second power supply state based on different power threshold ranges of the battery's SOC. The first control module is used to respond to the power supply state, the vehicle is driven by the battery, and based on the vehicle speed change state, determine whether it is necessary to control the power compensation unit to drive the motor to provide the power required to compensate the vehicle speed change. The second control module is used to start the range extender in response to the first power supply state, and control the power compensation unit or the battery drive motor to provide the power required to compensate for the vehicle speed change based on the vehicle's power demand, the vehicle speed change state and the remaining energy of the power compensation unit. The third control module is used to respond to the second power supply state, when the vehicle enters limp mode, and control the power compensation unit or the range extender drive motor to provide the power required to compensate for the vehicle speed change based on the vehicle's power demand and the vehicle speed change state. The determining module is specifically used for: The first and second power supply states of the battery are determined, wherein the first power supply state is when the SOC is greater than the first power threshold and less than or equal to the second power threshold, and the second power supply state is when the SOC is less than or equal to the first power threshold. Determine the battery's power supply status, where the state of charge (SOC) is greater than a second power threshold, and the second power threshold is greater than a first power threshold. The first control module is specifically used for: In response to the power supply state, the vehicle is driven by the battery, and when the vehicle speed change state is the first speed change state, the battery alone supplies power to the vehicle, and the vehicle drives the vehicle with the power required by the battery-driven motor. In response to the power supply state, the vehicle is driven by the battery, and when the vehicle speed change state is the second speed change state, the power compensation unit is controlled to discharge in order to drive the motor to compensate for the first difference power required for the vehicle speed change. The second speed change state is the vehicle state when the speed change within a time interval is greater than a set speed change threshold, and the first speed change state is the vehicle state when the speed change within a time interval is less than or equal to the set speed change threshold.

9. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-7.

10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-7.

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