A power distribution method and device of a vehicle range extender and a vehicle

Abstract

The application discloses a power distribution method and device of a vehicle range extender and a vehicle, and can improve the economy of the range extender. The power distribution method of the vehicle range extender comprises the following steps: overlapping a universal characteristic diagram of the engine and a universal characteristic diagram of the range extender motor, and dividing a common region; wherein the common region represents an economic fuel consumption region of the engine and an efficient region of the range extender motor; determining an economic power region of the range extender motor and an economic power region of the engine based on the common region; obtaining hydraulic power of a vehicle hydraulic system; determining a hydraulic power change condition based on a change range of the hydraulic power; and distributing power of the vehicle range extender according to the hydraulic power change condition, the economic power region of the range extender motor and the economic power region of the engine.

Description

Technical Field

[0001] This application relates to the field of vehicle power distribution technology, specifically to a power distribution method, device, and vehicle for a vehicle range extender. Background Technology

[0002] In the field of new energy vehicles, especially in the development of range-extended electric vehicles (REEVs), energy management strategy is one of the core technologies, and its performance directly affects key indicators such as vehicle power, economy, and emissions characteristics. Currently, the energy management strategy for REEVs allocates power output between the range extender and the battery based on pre-set rules and logic, according to the vehicle's operating state. Rule-based strategies are typically static; once the rules are established, it's difficult to dynamically adjust them based on real-time changes in operating conditions during vehicle operation. Furthermore, existing strategies are mostly designed for steady-state conditions and do not fully consider the range extender's performance under varying operating conditions, leading to a mismatch between power allocation and actual demand, thus exacerbating fuel consumption. Summary of the Invention

[0003] To address the aforementioned technical problems, this application is proposed. Embodiments of this application provide a power distribution method, apparatus, and vehicle for a vehicle range extender, which can improve the economic efficiency of range extender operation.

[0004] According to a first aspect of this application, a power allocation method for a vehicle range extender is provided. The range extender includes a range extender motor and an engine. The power allocation method includes: overlapping the universal characteristic diagrams of the engine and the range extender motor to divide a common region; wherein the common region represents the overlapping operating range of the engine's economic fuel consumption zone and the range extender motor's high efficiency zone; determining the economic power region of the range extender motor and the economic power region of the engine based on the common region; acquiring the hydraulic power of the vehicle's hydraulic system; determining the hydraulic power variation conditions based on the variation amplitude of the hydraulic power; and performing power allocation for the vehicle range extender according to the hydraulic power variation conditions, the economic power region of the range extender motor, and the economic power region of the engine.

[0005] As one possible implementation, the hydraulic power variation conditions include: a steady-state variation condition; the range extender motor includes a first motor and a second motor; the total power generation of the range extender motor is the sum of the power generation of the first motor and the power generation of the second motor; the economic power range of the range extender motor includes a minimum economic power value and a maximum economic power value; wherein, the power allocation of the vehicle range extender based on the hydraulic power variation conditions, the economic power range of the range extender motor, and the economic power range of the engine includes: when the hydraulic power variation conditions are steady-state variation conditions, obtaining the vehicle's required power generation; and allocating the power of the vehicle range extender based on the vehicle's required power generation and the economic power range of the range extender motor.

[0006] As one possible implementation, the power allocation of the vehicle range extender is performed based on the total vehicle power demand and the economic power range of the range extender motor, including: when the total vehicle power demand is less than the minimum economic power value, the power output of both the first motor and the second motor is allocated to be 0; when the total vehicle power demand is greater than or equal to the minimum economic power value and less than the maximum economic power value, the power output of the first motor is allocated to be the total vehicle power demand, and the power output of the second motor is allocated to be 0; when the total vehicle power demand is greater than or equal to the maximum economic power value, the power output of both the first motor and the second motor is allocated to be half of the total vehicle power demand.

[0007] As one possible implementation, the hydraulic power variation conditions further include: transient variation conditions, where the engine power is the sum of the total power generated by the range extender motor and the hydraulic power; power allocation of the vehicle range extender based on the hydraulic power variation conditions, the economic power range of the range extender motor, and the economic power range of the engine, further including: when the hydraulic power variation conditions are transient variation conditions, acquiring the current signal of the hydraulic pump displacement control valve; based on the current signal of the hydraulic pump displacement control valve, determining that a sudden change in hydraulic power has occurred, and adjusting the power generation point of the range extender from a first operating point to a second operating point; wherein, the first operating point conforms to the principle of economic optimization, the second operating point is an intermediate transitional operating point, the vehicle's required power generation at the first operating point is less than the vehicle's required power generation at the second operating point, and the engine power at the first operating point is less than the sum of the vehicle's required power generation and the hydraulic power at the second operating point.

[0008] As one possible implementation, the power allocation of the vehicle range extender is performed based on the changing hydraulic power conditions, the economic power range of the range extender motor, and the economic power range of the engine. This further includes: when the actual hydraulic power increases based on the current signal from the hydraulic pump displacement control valve, adjusting the range extender's power generation operating point from the second operating point to the third operating point; wherein the engine power at the third operating point is the same as the engine power at the second operating point, and the second and third operating points are located within the engine's economic power range. During the adjustment process, the increase in hydraulic power is equivalent to the decrease in the vehicle's required power generation.

[0009] As one possible implementation, the power allocation of the vehicle range extender is performed based on the changing hydraulic power conditions, the economic power range of the range extender motor, and the economic power range of the engine. This further includes: when the hydraulic power decreases to the power level before the hydraulic power abrupt change occurs, adjusting the range extender's power generation operating point from the third operating point back to the first operating point; wherein the vehicle's required power generation at the third operating point is equal to the vehicle's required power generation at the first operating point, and the hydraulic power at the first operating point is less than the hydraulic power at the third operating point.

[0010] As one possible implementation, the hydraulic power variation conditions include steady-state variation conditions and transient variation conditions. Determining the hydraulic power variation condition based on the magnitude of the hydraulic power variation includes: dividing the hydraulic power by a preset time to calculate the hydraulic power variation rate per unit time; when the hydraulic power variation rate per unit time is greater than or equal to a preset hydraulic power variation rate threshold, the hydraulic power variation condition is determined to be a transient variation condition; when the hydraulic power variation rate per unit time is less than the preset hydraulic power variation rate threshold, the hydraulic power variation condition is determined to be a steady-state variation condition.

[0011] As one possible implementation, the power distribution method for the vehicle range extender also includes: acquiring the real-time engine speed, the range extender motor output torque, and the engine output torque; and calculating the required power generation capacity of the entire vehicle based on the real-time engine speed, the range extender motor output torque, and the engine output torque.

[0012] According to a second aspect of this application, a power distribution device for a vehicle range extender is provided. The range extender includes a range extender motor and an engine. The power distribution device for the vehicle range extender includes: a division module for overlaying the universal characteristic diagram of the engine and the universal characteristic diagram of the range extender motor to divide a common region; wherein the common region represents the overlapping operating range of the economic fuel consumption zone of the engine and the high efficiency zone of the range extender motor; a region determination module for determining the economic power zone of the range extender motor and the economic power zone of the engine based on the common region; an acquisition module for acquiring the hydraulic power of the vehicle hydraulic system; an operating condition determination module for determining the changing operating conditions of the hydraulic power based on the change range of the hydraulic power; and an allocation module for performing power allocation of the vehicle range extender according to the changing operating conditions of the hydraulic power, the economic power zone of the range extender motor, and the economic power zone of the engine.

[0013] According to a third aspect of this application, a vehicle is provided, comprising: a range extender including a range extender motor and an engine, the range extender motor including a first motor and a second motor; a hydraulic system; and a power distribution device for the vehicle range extender as described in the second aspect or any embodiment thereof, the power distribution device for performing a power distribution method for the vehicle range extender.

[0014] The power distribution method, device, and vehicle for a vehicle range extender provided in this application utilize the engine's universal characteristic diagram, which reflects the engine's key operating characteristics and guides the selection of the engine's operating point. The universal characteristic diagram of the range extender motor reflects the range extender motor's operating characteristics and is used to optimize motor operating condition distribution. By overlaying the engine's and range extender motor's universal characteristic diagrams, the common high-efficiency regions of the engine and range extender motor can be matched, identifying the optimal global efficiency of the hybrid system. Next, after determining the economic power regions of the range extender motor and the engine from the common high-efficiency regions, the operating conditions of hydraulic power variation are divided according to hydraulic power changes. The power distribution between the range extender motor and the engine is adjusted to adapt to various operating conditions of hydraulic power variation. Power distribution is performed within the economic power regions of the range extender motor and the engine, improving the overall vehicle operating efficiency and simultaneously enhancing the economic efficiency of the range extender's operation. Attached Figure Description

[0015] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0016] Figure 1This is a schematic diagram of a range extender assembly structure provided in an embodiment of this application.

[0017] Figure 2 This is a schematic flowchart of a power distribution method for a vehicle range extender provided in an exemplary embodiment of this application.

[0018] Figure 3 This is a schematic diagram showing the overlap of the universal characteristic diagram of the engine and the universal characteristic diagram of the range extender motor provided in an exemplary embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the power generation operating condition provided in an exemplary embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the power distribution device of a vehicle range extender provided in an exemplary embodiment of this application.

[0021] Figure 6 This is a structural diagram of an electronic device provided in an exemplary embodiment of this application. Detailed Implementation

[0022] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0023] In the field of new energy vehicles, especially in the development of range-extended electric vehicles (REEVs), energy management strategy is one of the core technologies. Its performance directly affects key indicators such as vehicle power, economy, and emissions characteristics. With increasing global emphasis on environmental protection and sustainable energy use, the new energy vehicle market is experiencing rapid growth, and consumers are demanding higher and higher standards for vehicle range, fuel economy, and driving comfort. REEVs, as a type of vehicle that combines the clean and environmentally friendly features of pure electric vehicles with the range advantages of traditional gasoline vehicles, have received widespread attention. An efficient energy management strategy is key to fully leveraging these advantages.

[0024] Range-extended electric vehicles (REEVs) are equipped with a range extender, a device in electric or hybrid vehicles used to extend driving range. It is typically a small internal combustion engine (such as a gasoline or diesel engine) combined with a generator. The main function of the range extender is to recharge the battery by generating electricity when the battery is depleted, thereby extending the vehicle's driving range. Range extenders can maintain lower fuel consumption and emissions during vehicle operation, enhancing the ease of use of electric vehicles.

[0025] Figure 1 This is a schematic diagram of a range extender assembly structure provided in an embodiment of this application, as shown below. Figure 1 As shown, the range extender includes an engine (engine power PEng), a first motor (first motor power Pisg1), a second motor (second motor power Pisg2), a PTO (Power Take-Off), an ECU (Electronic Control Unit), an RCU (Remote Control Unit), and an MCU (Microcontroller Unit) 1. The engine is sequentially mechanically connected to the first motor, the second motor, and the PTO. The engine is directly coupled to the first and second motors via a fixed speed ratio mechanical connection, ensuring complete synchronization of their speeds during operation, providing a basis for the overlap of the universal diagram. The RCU and MCU1 are connected via a CAN network. The PTO is a power take-off device, a device in a mechanical system that transmits engine power to external equipment, commonly found in loaders, trucks, and other equipment that use PTOs to achieve multi-functional operations (such as loading and lifting).

[0026] The vehicle also includes a VCU (Vehicle Control Unit), MCU2, a BMS (Battery Management System), a drive motor (PTM), and a power battery (PBatt). The engine is electrically connected to the ECU, and the ECU is connected to the VCU via a CAN network. The first and second motors are electrically connected to MCU1. MCU1 is electrically connected to MCU2 and the BMS respectively. MCU2 is electrically connected to the drive motor, and the BMS is electrically connected to the power battery. The VCU is connected to MCU2 and the BMS via a CAN network.

[0027] Range-extended vehicles also include a hydraulic system. A hydraulic system uses hydraulic fluid as its working medium, transmitting power and control signals through the pressure energy of the fluid, and using valves, pumps, and actuators to drive mechanical devices to complete specific actions. Its core principle is to increase force by changing pressure, and it is widely used in machinery, engineering, and aerospace fields. The range extender not only generates electricity to power the vehicle's electric motor and charge the battery, but also meets the power requirements of the vehicle's hydraulic system, which directly draws power from the range extender. Therefore, there is a certain degree of interaction between the range extender and the hydraulic system.

[0028] As one possible implementation, the range-extended vehicle proposed in this application can be a range-extended loader. Loaders are earthmoving machinery widely used in construction, mining, hydropower, and port industries, primarily for loading and unloading bulk materials such as soil, sand, gravel, lime, and coal, and capable of light excavation of ores and hard soil. By changing auxiliary devices, it can also perform bulldozing, lifting, timber loading and unloading, ground leveling, and towing of other equipment. Its core advantages lie in its high operating speed, high efficiency, strong mobility, and ease of operation, making it a key piece of equipment in engineering construction. Installing a power distribution device in the range-extended loader, implementing the power distribution method of the vehicle's range extender, can reduce fuel consumption and emissions, and improve the overall vehicle's dynamic performance and economy.

[0029] Figure 2 This is a schematic flowchart of a power distribution method for a vehicle range extender provided in an exemplary embodiment of this application, as shown below. Figure 2 As shown, firstly, the universal characteristic diagrams of the overlapping engine and the range extender motor are used to delineate the common region (see...). Figure 2 (S210); where the common region represents the overlapping operating range of the engine's economic fuel consumption zone and the range extender motor's high-efficiency zone. By matching the high-efficiency zones of the engine and the range extender motor, the optimal solution for vehicle operation efficiency can be found. Secondly, based on the common region, the economic power zone of the range extender motor and the economic power zone of the engine are determined (see S210). Figure 2 (S220) Since the range extender motor and engine are mechanically connected, their speeds remain consistent during operation. Since both the engine's and the range extender motor's universal characteristic diagrams have speed on the horizontal axis, a common speed range for both the motor and engine can be found within this common region. Within this common speed range, the economic power region for each individual range extender motor and engine can be identified; this economic power region represents the high-efficiency operating range. Next, the hydraulic power of the vehicle's hydraulic system is obtained (see... Figure 2 (S230). Then, the hydraulic power variation conditions are determined based on the magnitude of the hydraulic power variation (see S230). Figure 2 (S240) Hydraulic power exhibits both steady-state and transient variations, and different power distribution strategies can be adjusted based on different operating conditions. Finally, based on the varying hydraulic power conditions, the economic power range of the range extender motor, and the economic power range of the engine, the power distribution of the vehicle's range extender is performed (see [reference]). Figure 2 (S250). Based on the efficient operating range of the range extender motor and engine, different power distribution strategies are determined by varying operating conditions to optimize the energy efficiency of the range extender, achieving high efficiency, low loss, low fuel consumption, and low emissions.

[0030] The following text combines Figure 2The power distribution method of the vehicle range extender provided in the embodiments of this application will be described in more detail.

[0031] In S210, the universal characteristic diagrams of the overlapping engine and the range extender motor are used to divide the common region.

[0032] The common area represents the overlapping operating range of the engine's economic fuel consumption zone and the range extender motor's high efficiency zone.

[0033] The universal characteristic diagram, also known as a MAP, is a data visualization tool used for engines and range extenders to describe their performance characteristics under different operating conditions. Each point on the engine's universal characteristic diagram represents a specific engine state, i.e., a specific combination of load and speed. Through the engine's universal characteristic diagram, engineers can determine the optimal ignition timing, fuel injection quantity, and other control parameters for the engine under different operating conditions. The universal characteristic diagram of a range extender reflects the efficiency distribution of the range extender at different speeds and torques; it is the efficiency distribution diagram of the range extender. By using the universal characteristic diagram of a range extender, the distribution of its high-efficiency zone under different speed control and load torque conditions can be obtained.

[0034] Figure 3 This is a schematic diagram showing the overlap of the universal characteristic diagram of the engine and the universal characteristic diagram of the range extender motor provided in an exemplary embodiment of this application, as shown below. Figure 3 As shown, the universal characteristic diagrams of the engine and the range extender motor are overlaid. The engine's universal characteristic diagram has the engine speed on the X-axis, engine torque on the Y-axis, and engine fuel consumption rate on the Z-axis. The motor's universal characteristic diagram has the motor speed on the X-axis, motor torque on the Y-axis, and motor system efficiency on the Z-axis. Because the engine and range extender motor are mechanically connected, their speeds remain consistent during operation. Based on this characteristic, the universal characteristic diagrams of the engine and range extender motor can be overlaid using their respective speeds. Figure 3 It can be seen that the common area of ​​the engine's economical fuel consumption zone and the electric motor's high-efficiency zone is the speed range of N1-N2. Figure 3 The color differences of the universal characteristic diagram are not shown. In practical applications, the universal characteristic diagram will also have color differences according to different efficiency values ​​to facilitate better division of common areas.

[0035] In S220, the economic power range of the range extender motor and the economic power range of the engine are determined based on the common region.

[0036] The economic power range of a range extender motor refers to the operating range of the motor within the speed-torque range where it achieves the highest efficiency. When operating within this range, the efficiency of converting electrical energy into mechanical energy is at its highest, reducing energy loss and extending the vehicle's driving range. Similarly, the economic power range of an engine refers to the speed-load range where its fuel consumption rate is lowest. When operating within this range, fuel combustion is more complete, significantly improving thermal efficiency and thus reducing fuel consumption and emissions.

[0037] Continue to refer to Figure 3 Within a common region, the economic operating power of each individual range extender motor and engine is identified. The economic power region for the range extender motor is P1-P2, and for the engine, it is P3-P4. Specifically, P1 in the range extender motor's economic power region is the lowest point, representing the minimum economic power value and corresponding to the motor's rated power—the power it can continuously output during long-term stable operation. At this stage, the range extender motor has high efficiency and low energy loss, representing the lower limit of the economic power region. P2 in the range extender motor's economic power region is the highest point, representing the maximum economic power value and corresponding to the motor's peak or maximum power. This typically occurs during the constant power output phase after the motor speed exceeds its base speed. P3 in the engine's economic power region is the lowest point, corresponding to the engine's lowest stable power output point. While the engine can maintain operation at this stage, its efficiency is low, and energy loss is high, representing the lower limit of the economic power region. P4 in the engine's economic power region is the highest point, corresponding to the engine's maximum power output point, where the engine delivers its strongest power.

[0038] In S230, the hydraulic power of the vehicle's hydraulic system is obtained.

[0039] The hydraulic power of a vehicle's hydraulic system can be obtained by directly measuring parameters or indirectly calculating them. For example, a pressure sensor can be installed on the high-pressure side of the hydraulic system (such as the pump outlet or actuator inlet) to measure the pump outlet pressure, and a flow meter (such as a turbine type or ultrasonic type) can be connected in series in the hydraulic line to measure the flow rate. The hydraulic power can then be calculated by multiplying the pump outlet pressure and the flow rate.

[0040] In S240, the operating conditions of hydraulic power variation are determined based on the magnitude of hydraulic power variation.

[0041] The hydraulic power change conditions include steady-state change conditions and transient change conditions. In some embodiments, the hydraulic power is divided by a preset time to calculate the hydraulic power change rate per unit time. When the hydraulic power change rate per unit time is greater than or equal to a preset hydraulic power change rate threshold, the hydraulic power change condition is determined to be a transient change condition; when the hydraulic power change rate per unit time is less than the preset hydraulic power change rate threshold, the hydraulic power change condition is determined to be a steady-state change condition. For example, a transient change condition satisfies: |Phps / DT|≥Plmt, where Phps represents the hydraulic power, DT represents a time period in seconds, Phps / DT refers to the change amplitude of hydraulic power per unit time in kW / s, and Plmt represents the preset hydraulic power change rate threshold. For example, if the preset hydraulic power change rate threshold is set to 10 kW / s, then when Phps / DT is greater than 10 kW / s, the change condition is confirmed as a transient change condition. Steady-state changing conditions satisfy |Phps / DT|<Plmt, where Phps represents hydraulic power, DT represents a time period in seconds, Phps / DT refers to the change in hydraulic power per unit time in kW / s, and Plmt represents a preset hydraulic power change rate threshold. For example, if the preset hydraulic power change rate threshold is set to 10 kW / s, then when Phps / DT is less than 10 kW / s, the changing condition is confirmed as a steady-state changing condition.

[0042] In the S250, the power distribution of the vehicle's range extender is based on the changing hydraulic power conditions, the economic power range of the range extender motor, and the economic power range of the engine.

[0043] In some embodiments, the hydraulic power variation conditions include a steady-state variation condition. The range extender motor may include a first motor and a second motor. The total power output of the range extender motor is the sum of the power output of the first motor and the power output of the second motor, i.e., Pisg = Pisg1 + Pisg2, where Pisg represents the total power output of the range extender motor, Pisg1 represents the power output of the first motor, and Pisg2 represents the power output of the second motor. When the hydraulic power variation condition is a steady-state variation condition, the required power output of the entire vehicle is obtained; based on the required power output of the entire vehicle and the economic power range of the range extender motor, the power of the vehicle range extender is allocated.

[0044] One possible approach is to collect real-time engine speed, range extender motor output torque, and engine output torque. Based on these data, the required power generation for the entire vehicle can be calculated.

[0045] In some embodiments, during steady-state change conditions, the power generation of the two motors is allocated according to the power generation requirement of the vehicle. When the power generation requirement of the vehicle is less than the minimum economic power value, the power generation of both the first motor and the second motor is 0. That is, when the power generation requirement of the vehicle Pchg < P1, Pisg1 = 0 and Pisg2 = 0, which means that the two motors do not generate power when the power is below a certain level. When the power generation requirement of the vehicle is greater than or equal to the minimum economic power value and less than the maximum economic power value, the power generation of the first motor is the power generation requirement of the vehicle, and the power generation of the second motor is 0. That is, when the power generation requirement of the vehicle P1 ≤ Pchg < 2P1, Pisg1 = Pchg and Pisg2 = 0, where 2P1 = P2. It can be understood that when the power is between 1 times and 2 times the minimum power for the economic operation of the motor, a single motor is responsible for power generation. When the power generation requirement of the vehicle is greater than or equal to the maximum economic power value, the power generation of both the first motor and the second motor is half of the power generation requirement of the vehicle. That is, when the power generation requirement of the vehicle Pchg ≥ 2P1, Pisg1 = Pchg / 2 and Pisg2 = Pchg / 2, where 2P1 = P2. It can be understood that when the power is higher than 2 times the minimum economic operation power of the motor, the two motors share the required power equally. Based on this, the power generation of the motor is optimized, and a reasonable power generation plan is made when the two motors are used together to improve the power generation efficiency and economy.

[0046] In some embodiments, the change conditions of the hydraulic power further include: transient change conditions. The power of the engine is the sum of the total power generation of the range extender motor and the hydraulic power, that is, PEng = Pisg + Phps, where PEng represents the power of the engine, Pisg represents the total power generation of the range extender motor, and Phps represents the hydraulic power.

[0047] In some embodiments, when the hydraulic power change is a transient change, the current signal of the hydraulic pump displacement control valve is acquired. The current signal of the hydraulic pump displacement control valve directly changes the output flow of the hydraulic system by adjusting the pump's displacement, thus affecting the hydraulic power. When the driver presses the hydraulic handle, the hydraulic pump starts working, and the hydraulic power suddenly increases. Therefore, a delay can be made between receiving the hydraulic handle signal and executing the hydraulic pump current, allowing for advance control before the sudden increase in hydraulic power. By receiving the current signal from the hydraulic pump displacement control valve, the sudden change in hydraulic power can be predicted in advance. Based on this, and determining that a sudden change in hydraulic power has occurred based on the current signal of the hydraulic pump displacement control valve, the range extender's power generation operating point can be adjusted from the first operating point to the second operating point. The first operating point conforms to the principle of economic optimization, while the second operating point is an intermediate transitional condition. The vehicle's required power generation at the first operating point is less than the vehicle's required power generation at the second operating point, and the engine power at the first operating point is less than the sum of the vehicle's required power generation and hydraulic power at the second operating point. Figure 4 This is a schematic diagram of the power generation operating condition provided in an exemplary embodiment of this application, as shown below. Figure 4 As shown, O1 represents the first operating point, O2 represents the second operating point, the horizontal axis represents hydraulic power, and the vertical axis represents the power generation required by the vehicle. According to the steady-state operating condition setting principle, O1 satisfies the following conditions, which conforms to the economic optimal principle: P1≤Pchg<2P1, Pisg1=Pchg, Pisg2=0. Assuming that before the hydraulic power change, the range extender's power generation operating point is located at O1, based on the current signal of the hydraulic pump displacement control valve, when it is known that the hydraulic power change occurs, the power generation operating point is adjusted from O1 to O2 in advance before the change occurs. O2 is an intermediate transition operating condition. The purpose is to increase the power generation from O1 to O2 in advance, thereby increasing the engine power to the power generation and hydraulic power corresponding to O2.

[0048] Next, when the actual hydraulic power increases based on the current signal from the hydraulic pump displacement control valve, the range extender's generator operating point is adjusted from the second operating point to the third operating point. The engine power at the third operating point is the same as the engine power at the second operating point. Both the second and third operating points are located within the engine's economic power range. During the adjustment process, the increase in hydraulic power is equivalent to the decrease in the vehicle's required generator power. See also... Figure 4 O3 represents the third operating point. During the process from O2 to O3, the engine power remains constant. The engine power is the sum of the vehicle's required power generation and hydraulic power. Therefore, in order to maintain the engine power constant, the increase in hydraulic power during the process is equal to the decrease in the vehicle's required power generation.

[0049] Finally, when the hydraulic power decreases to the level before the hydraulic power surge, the range extender's power generation operating point is adjusted back from the third operating point to the first operating point; wherein, the vehicle's required power generation at the third operating point is equal to the vehicle's required power generation at the first operating point, and the hydraulic power at the first operating point is less than the hydraulic power at the third operating point. See also Figure 4 The power generation at point O3 is equal to the power generation at point O1. During the process from O3 to O1, the power generation remains unchanged, that is, the power generation efficiency is the same, but the hydraulic power decreases.

[0050] See Figure 4 Among them, the power generation operating points of O1 and O3 are in the P3-P4 region, which is the economic power region of the engine. In transient operating conditions, the power generation is increased in advance. When the actual hydraulic power begins to increase, the motor power is reduced to prioritize the hydraulic power, thereby improving the efficiency of the vehicle operation. At the same time, the engine operates in the economic fuel consumption region, which improves the economic efficiency of the range extender operation.

[0051] Figure 5 This is a schematic diagram of the structure of the power distribution device of a vehicle range extender provided in an exemplary embodiment of this application, as shown below. Figure 5 As shown, the range extender includes a range extender motor and an engine. The power distribution device 5 of the vehicle range extender includes: a division module 51, used to overlap the universal characteristic diagram of the engine and the universal characteristic diagram of the range extender motor to divide a common region; wherein, the common region represents the working range where the economic fuel consumption zone of the engine overlaps with the high efficiency zone of the range extender motor; a region determination module 52, based on the common region, determines the economic power zone of the range extender motor and the economic power zone of the engine; an acquisition module 53, acquires the hydraulic power of the vehicle hydraulic system; an operating condition determination module 54, determines the operating condition of hydraulic power variation based on the variation range of hydraulic power; and an allocation module 55, performs power allocation of the vehicle range extender according to the operating condition of hydraulic power variation, the economic power zone of the range extender motor, and the economic power zone of the engine.

[0052] As one possible implementation, the hydraulic power variation conditions can include: a steady-state variation condition, where the range extender motor includes a first motor and a second motor, the total power output of the range extender motor is the sum of the power output of the first motor and the power output of the second motor, and the economic power range of the range extender motor includes the minimum economic power value and the maximum economic power value; wherein, the allocation module 55 can be configured to: when the hydraulic power variation condition is a steady-state variation condition, obtain the power output required by the vehicle; and allocate the power of the vehicle range extender according to the power output required by the vehicle and the economic power range of the range extender motor.

[0053] As one possible implementation, the allocation module 55 can also be configured as follows: when the total power demand of the vehicle is less than the minimum economic power value, the power generation of both the first motor and the second motor is allocated to be 0; when the total power demand of the vehicle is greater than or equal to the minimum economic power value and less than the maximum economic power value, the power generation of the first motor is allocated to be the total power demand of the vehicle, and the power generation of the second motor is allocated to be 0; when the total power demand of the vehicle is greater than or equal to the maximum economic power value, the power generation of both the first motor and the second motor is allocated to be half of the total power demand of the vehicle.

[0054] As one possible implementation, the hydraulic power variation conditions can also include: transient variation conditions, where the engine power is the sum of the total power generated by the range extender motor and the hydraulic power; the allocation module 55 can be configured to: when the hydraulic power variation condition is a transient variation condition, acquire the current signal of the hydraulic pump displacement control valve; based on the current signal of the hydraulic pump displacement control valve, determine that a sudden change in hydraulic power has occurred, and adjust the power generation condition point of the range extender from the first condition point to the second condition point; wherein, the first condition point conforms to the principle of economic optimization, the second condition point is an intermediate transition condition, the total vehicle power demand at the first condition point is less than the total vehicle power demand at the second condition point, and the engine power at the first condition point is less than the sum of the total vehicle power demand and hydraulic power at the second condition point.

[0055] As one possible implementation, the allocation module 55 can be configured to: when the actual hydraulic power increases based on the current signal of the hydraulic pump displacement control valve, adjust the generator operating point of the range extender from the second operating point to the third operating point; wherein the engine power at the third operating point is the same as the engine power at the second operating point, the second operating point and the third operating point are located in the economic power range of the engine, and the increase in hydraulic power during the adjustment process is equivalent to the decrease in the required generator power of the whole vehicle.

[0056] As one possible implementation, the allocation module 55 can be configured to: when the hydraulic power decreases to the power before the hydraulic power sudden change occurs, adjust the power generation operating point of the range extender from the third operating point back to the first operating point; wherein, the total vehicle power demand at the third operating point is equal to the total vehicle power demand at the first operating point, and the hydraulic power at the first operating point is less than the hydraulic power at the third operating point.

[0057] As one possible implementation, the hydraulic power change conditions include steady-state change conditions and transient change conditions. The condition determination module 54 can be configured to: divide the hydraulic power by a preset time to calculate the hydraulic power change rate per unit time; when the hydraulic power change rate per unit time is greater than or equal to a preset hydraulic power change rate threshold, the hydraulic power change condition is determined to be a transient change condition; when the hydraulic power change rate per unit time is less than the preset hydraulic power change rate threshold, the hydraulic power change condition is determined to be a steady-state change condition.

[0058] As one possible implementation, the power distribution device 5 of the vehicle range extender may also include: acquiring the real-time engine speed, the output torque of the range extender motor, and the output torque of the engine; and calculating the required power generation of the entire vehicle based on the real-time engine speed, the output torque of the range extender motor, and the output torque of the engine.

[0059] An electronic device includes: a processor; a memory for storing processor-executable instructions; and a processor for executing the power distribution method of a vehicle range extender as described in the embodiments provided in this application.

[0060] Below, for reference Figure 6 This application describes an electronic device according to embodiments thereof. The electronic device may be either or both of a first device and a second device, or a standalone device independent of them, which may communicate with the first device and the second device to receive acquired input signals from them.

[0061] Figure 6 A block diagram of an electronic device according to an embodiment of this application is illustrated.

[0062] like Figure 6 As shown, the electronic device 60 includes one or more processors 61 and a memory 62.

[0063] The processor 61 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 60 to perform desired functions.

[0064] The memory 62 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 61 may execute the program instructions to implement the power distribution method of the vehicle range extender of the various embodiments of this application described above, and / or other desired functions. Various contents such as input signals, signal components, and noise components may also be stored in the computer-readable storage medium.

[0065] In one example, the electronic device 60 may also include an input device 63 and an output device 64, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).

[0066] When the electronic device is a standalone device, the input device 63 can be a communication network connector for receiving the acquired input signals from the first device and the second device.

[0067] In addition, the input device 63 may also include, for example, a keyboard, a mouse, etc.

[0068] The output device 64 can output various information to the outside, including determined distance information, direction information, etc. The output device 64 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0069] Of course, for the sake of simplicity, Figure 6 Only some of the components of the electronic device 60 relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the electronic device 60 may include any other suitable components depending on the specific application.

[0070] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0071] A computer-readable storage medium stores a computer program for executing the power distribution method of a vehicle range extender described in the embodiments provided in this application.

[0072] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0073] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A power distribution method for a vehicle range extender, characterized in that, The range extender includes a range extender motor and an engine, and the power distribution method of the vehicle range extender includes: The universal characteristic diagrams of the engine and the range extender motor are superimposed to divide a common region; wherein, the common region represents the working range in which the economic fuel consumption zone of the engine and the high efficiency zone of the range extender motor overlap. Based on the common region, the economic power region of the range extender motor and the economic power region of the engine are determined; Obtain the hydraulic power of the vehicle's hydraulic system; The operating conditions for hydraulic power variation are determined based on the magnitude of the hydraulic power variation. The power distribution of the vehicle range extender is performed based on the changing hydraulic power conditions, the economic power range of the range extender motor, and the economic power range of the engine. The hydraulic power variation conditions include: steady-state variation conditions and transient variation conditions. The range extender motor includes a first motor and a second motor. The total power generation of the range extender motor is the sum of the power generation of the first motor and the power generation of the second motor. The economic power range of the range extender motor includes the minimum economic power value and the maximum economic power value. The power of the engine is the sum of the total power generation of the range extender motor and the hydraulic power. When the hydraulic power change condition is a steady-state change condition, obtain the power generation demand of the whole vehicle; Based on the vehicle's required power generation and the economic power range of the range extender motor, the power allocation of the vehicle's range extender is performed: When the required power generation of the whole vehicle is less than the minimum economic power value, the power generation of both the first motor and the second motor is 0. When the required power generation of the whole vehicle is greater than or equal to the minimum economic power value and less than the maximum economic power value, the power generation of the first motor is allocated to the required power generation of the whole vehicle, and the power generation of the second motor is allocated to 0. When the total power demand of the vehicle is greater than or equal to the maximum economic power value, the power generation of the first motor and the second motor is allocated to each of them to be half of the total power demand of the vehicle. When the hydraulic power change is a transient change, the current signal of the hydraulic pump displacement control valve is acquired. Based on the current signal of the hydraulic pump displacement control valve, it is determined that a sudden change has occurred in the hydraulic power, and the power generation operating point of the range extender is adjusted from the first operating point to the second operating point. The first operating point conforms to the principle of economic optimization, the second operating point is an intermediate transitional operating point, the vehicle's required power generation at the first operating point is less than the vehicle's required power generation at the second operating point, and the engine power at the first operating point is less than the sum of the vehicle's required power generation and hydraulic power at the second operating point.

2. The power distribution method for a vehicle range extender according to claim 1, characterized in that, The power distribution of the vehicle range extender based on the changing hydraulic power conditions, the economic power range of the range extender motor, and the economic power range of the engine also includes: When the actual hydraulic power increases based on the current signal of the hydraulic pump displacement control valve, the range extender's power generation operating point is adjusted from the second operating point to the third operating point; wherein, the engine power at the third operating point is the same as the engine power at the second operating point, and the second and third operating points are located in the engine's economic power range, and the increase in hydraulic power during the adjustment process is equivalent to the decrease in the vehicle's required power generation.

3. The power distribution method for a vehicle range extender according to claim 2, characterized in that, The power distribution of the vehicle range extender based on the changing hydraulic power conditions, the economic power range of the range extender motor, and the economic power range of the engine also includes: When the hydraulic power decreases to the power before the hydraulic power sudden change occurs, the range extender's power generation operating point is adjusted from the third operating point back to the first operating point; wherein, the vehicle's required power generation at the third operating point is equal to the vehicle's required power generation at the first operating point, and the hydraulic power at the first operating point is less than the hydraulic power at the third operating point.

4. The power distribution method for a vehicle range extender according to claim 1, characterized in that, The hydraulic power variation conditions include steady-state variation conditions and transient variation conditions. The hydraulic power variation conditions are determined based on the magnitude of the hydraulic power variation, including: Divide the hydraulic power by the preset time to calculate the rate of change of hydraulic power per unit time. When the hydraulic power change rate per unit time is greater than or equal to a preset hydraulic power change rate threshold, the hydraulic power change condition is determined to be a transient change condition. When the rate of change of hydraulic power per unit time is less than the preset threshold for the rate of change of hydraulic power, the change condition of hydraulic power is determined to be a steady-state change condition.

5. The power distribution method for a vehicle range extender according to claim 1, characterized in that, The power distribution methods for vehicle range extenders also include: Obtain real-time engine speed, range extender motor output torque, and engine output torque; The required power generation for the entire vehicle is calculated based on the real-time engine speed, the output torque of the range extender motor, and the output torque of the engine.

6. A power distribution device for a vehicle range extender, characterized in that, The power distribution method for a vehicle range extender according to any one of claims 1-5, wherein the range extender includes a range extender motor and an engine, and the power distribution device for the vehicle range extender includes: A segmentation module is used to overlap the universal characteristic diagram of the engine and the universal characteristic diagram of the range extender motor to segment a common region; wherein, the common region represents the working range in which the economic fuel consumption zone of the engine and the high efficiency zone of the range extender motor overlap. The region determination module determines the economic power region of the range extender motor and the economic power region of the engine based on the common region. The module acquires the hydraulic power of the vehicle's hydraulic system. The operating condition determination module determines the operating condition of hydraulic power change based on the change range of the hydraulic power; The distribution module allocates power to the vehicle range extender based on the changing hydraulic power conditions, the economic power range of the range extender motor, and the economic power range of the engine.

7. A vehicle, characterized in that, include: A range extender, comprising a range extender motor and an engine, wherein the range extender motor comprises a first motor and a second motor; Hydraulic system; The power distribution device for a vehicle range extender as described in claim 6, wherein the power distribution device for a vehicle range extender is used to perform a power distribution method for a vehicle range extender.

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