A power following control method, device and medium for an extended-range power system

Abstract

The embodiments of this specification disclose a power following control method, device, and medium for an extended-range power system, which relates to the field of automotive control technology. The method includes: obtaining the required power at the input end of the drive motor according to real-time operating parameters; performing power distribution according to a preset rule to obtain the output power curve of the range extender and the output power curve of the power battery respectively; determining the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery according to the pre-acquired extended-range power system parameters of the vehicle, the output power curve of the range extender, and the output power curve of the power battery; in the equivalent total fuel consumption rate curve, determining a specified point where the equivalent total fuel consumption rate is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve, and taking the specified ratio corresponding to the specified point as the optimal power distribution ratio of the range extender and the power battery, and realizing the power following control of the extended-range power system through the optimal power distribution ratio.

Description

Technical Field

[0001] This specification relates to the technical field of vehicle control, and particularly to a power following control method, device, and medium for an extended-range power system. Background Art

[0002] The existing control strategy for an extended-range power system is based on a constant-temperature fixed-point control strategy. The engine start and stop are adjusted according to the state of charge (SOC) of the power battery, so that the engine outputs a constant power. At this time, the engine efficiency is high and does not change with the change of the power demand of the drive motor. Although the development and control strategy are simple, there are the following problems: First, the battery has been charging and discharging at high power, resulting in a short battery life. Second, when the SOC is near the lower boundary value, the battery will charge and discharge frequently, affecting the state of health (SOH) of the battery. In addition, the energy distribution is unreasonable, and the fuel consumption is relatively high compared with the power following control strategy. This control strategy does not consider the power demand of the drive motor. When the power demand suddenly increases when the power battery is close to and higher than the lower boundary value of the SOC, it is difficult for the power battery alone to meet the high-power demand in a short time, and it will also affect the battery life. In addition, efficiency losses such as generator efficiency and battery charge and discharge efficiency are not considered. The electrical energy of the battery essentially comes from the engine. After a series of efficiency losses, the equivalent fuel consumption rate will become relatively high, and the economic applicability is poor. The existing control strategy cannot meet the actual fuel consumption demand, affects the battery service life, and has poor economic applicability. Summary of the Invention

[0003] One or more embodiments of this specification provide a power following control method, device, and medium for an extended-range power system to solve the following technical problems: The existing control strategy cannot meet the actual fuel consumption demand, affects the battery service life, and has poor economic applicability.

[0004] One or more embodiments of this specification adopt the following technical solutions:

[0005] One or more embodiments of this specification provide a power following control method for an extended-range power system, characterized in that the method includes: obtaining real-time operating parameters of the vehicle, and obtaining the required power at the input end of the drive motor according to the real-time operating parameters; allocating the required power at the input end of the drive motor according to a preset rule to obtain an output power curve of the range extender and an output power curve of the power battery respectively, wherein the abscissa of the output power curve of the range extender and the output power curve of the power battery is the power allocation ratio, and the power allocation ratio is the ratio of the power of the power battery to the total power, and the total power includes the power of the power battery and the power of the range extender; determining a fuel consumption rate curve of the range extender and an equivalent fuel consumption rate curve of the power battery according to the pre-obtained extended-range power system parameters of the vehicle, the output power curve of the range extender and the output power curve of the power battery; processing the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain an equivalent total fuel consumption rate curve; determining a specified point in the equivalent total fuel consumption rate curve, and taking the specified ratio corresponding to the specified point as the optimal power allocation ratio of the range extender and the power battery, and realizing the power following control of the extended-range power system through the optimal power allocation ratio, wherein the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

[0006] Further, obtaining the required power at the input end of the drive motor according to the real-time operating parameters specifically includes: calculating the rotational speed, torque and required power at the output end of the drive motor of the vehicle according to the real-time operating parameters; performing interpolation calculation on a pre-obtained drive motor system efficiency MAP through the rotational speed and torque of the drive motor to obtain the drive motor efficiency; and obtaining the required power at the input end of the drive motor based on the drive motor efficiency and the required power at the output end.

[0007] Further, according to the pre-acquired parameters of the range extender power system of the whole vehicle, the output power curve of the range extender, and the output power curve of the power battery, determine the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery, which specifically includes: obtaining the parameters of the range extender power system of the whole vehicle, where the parameters of the range extender power system include the fuel consumption rate MAP of the range extender engine, the efficiency MAP of the generator system, and the charge and discharge efficiency of the power battery; obtaining the power following curve of the range extender according to the fuel consumption rate MAP of the range extender engine and the efficiency MAP of the generator system; obtaining the fuel consumption rate curve of the range extender through the output power curve of the range extender and the power following curve of the range extender, where the abscissa of the fuel consumption curve of the range extender is the power distribution ratio; generating the equivalent fuel consumption rate curve of the power battery according to the charge and discharge efficiency of the power battery and the output power curve of the power battery, where the abscissa of the equivalent fuel consumption rate curve of the power battery is the power distribution ratio.

[0008] Further, through the optimal power distribution ratio, realize the power following control of the range extender power system, which specifically includes: judging the current vehicle operation mode of the whole vehicle through the optimal power distribution ratio and the required power at the input end of the drive motor; calculating the total fuel consumption under the corresponding working conditions and the change in the state of charge of the power battery in the current vehicle operation mode according to the current vehicle operation mode of the whole vehicle, so as to realize the power following control of the range extender power system.

[0009] Further, judging the current vehicle operation mode of the whole vehicle through the optimal power distribution ratio and the required power at the input end of the drive motor specifically includes: obtaining the optimal range extender output power and the optimal power battery output power through the optimal power distribution ratio and the required power at the input end of the drive motor; determining the state of charge of the power battery of the whole vehicle according to the pre-acquired vehicle model of the whole vehicle, and presetting the lower boundary value of the state of charge of the power battery; judging the current vehicle operation mode of the whole vehicle through the required power at the input end of the drive motor, the optimal range extender output power, the optimal power battery output power, the state of charge of the power battery, and the lower boundary value of the state of charge of the power battery, where the current vehicle operation mode includes: energy recovery mode, shutdown mode, pure electric mode, hybrid drive mode, pure range extender mode, and driving and generating electricity mode.

[0010] Further, the current vehicle operation mode of the whole vehicle is determined based on the required power at the input end of the drive motor, the optimal range extender output power, the optimal power battery output power, the state of charge of the power battery, and the lower boundary value of the state of charge of the power battery. Specifically, it includes: if the required power at the input end of the drive motor is less than 0, it is determined that the current vehicle operation mode of the whole vehicle is the energy recovery mode; if the required power at the input end of the drive motor is equal to 0, it is determined that the current vehicle operation mode of the whole vehicle is the shutdown mode; when the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is 0, it is determined that the current vehicle operation mode of the whole vehicle is the pure electric mode; when the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is greater than 0 and less than the required power at the input end of the drive motor, it is determined that the current vehicle operation mode of the whole vehicle is the hybrid drive mode; when the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is equal to the required power at the input end of the drive motor, it is determined that the current vehicle operation mode of the whole vehicle is the pure range extender mode; if the required power at the input end of the drive motor is greater than 0, and the state of charge of the power battery is less than the lower boundary value of the state of charge of the power battery, and the optimal range extender output power is 0, it is determined that the current vehicle operation mode of the whole vehicle is the driving power generation mode.

[0011] Further, based on the real-time operation parameters, the rotational speed, torque, and required power at the output end of the drive motor of the whole vehicle are calculated. Specifically, it includes: calculating the real-time traction force according to the real-time vehicle speed and the vehicle driving equation in the real-time operation parameters; calculating the real-time optimal gear through the vehicle parameters in the real-time operation parameters, where the equivalent alternative fuel consumption rate corresponding to the optimal gear is the highest, and the equivalent alternative fuel consumption rate is used to represent the fuel consumption rate of the power battery replacing the range extender; based on the real-time traction force and the real-time optimal gear, calculating the rotational speed, torque, and required power at the output end of the drive motor of the whole vehicle.

[0012] Further, based on the fuel consumption rate MAP of the range extender engine and the efficiency MAP of the generator system, the power following curve of the range extender is obtained. Specifically, it includes: multiplying the fuel consumption rate MAP of the range extender engine and the efficiency MAP of the generator system to obtain the power following curve of the range extender, where the input of the power following curve of the range extender is the range extender power, and the output is the fuel consumption rate of the range extender.

[0013] One or more embodiments of this specification provide a power following control device for a range-extended power system, including:

[0014] At least one processor; and,

[0015] A memory communicatively connected to the at least one processor; wherein,

[0016] The memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to:

[0017] Obtain the real-time operating parameters of the whole vehicle, and obtain the required power at the input end of the drive motor according to the real-time operating parameters; allocate the required power at the input end of the drive motor according to a preset rule to obtain an output power curve of the range extender and an output power curve of the power battery respectively, wherein the abscissa of the output power curve of the range extender and the output power curve of the power battery is the power allocation ratio, and the power allocation ratio is the ratio of the power of the power battery to the total power, and the total power includes the power of the power battery and the power of the range extender; determine a fuel consumption rate curve of the range extender and an equivalent fuel consumption rate curve of the power battery according to the obtained range-extended power system parameters of the whole vehicle, the output power curve of the range extender and the output power curve of the power battery in advance; process the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain an equivalent total fuel consumption rate curve; determine a specified point in the equivalent total fuel consumption rate curve, and use the specified ratio corresponding to the specified point as the optimal power allocation ratio of the range extender and the power battery, and realize the power following control of the range-extended power system through the optimal power allocation ratio, wherein the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

[0018] A non-volatile computer storage medium provided by one or more embodiments of the present specification stores computer-executable instructions, and the computer-executable instructions are set to:

[0019] Obtain the real-time operation parameters of the whole vehicle, and based on the real-time operation parameters, obtain the required power at the input end of the drive motor; allocate the required power at the input end of the drive motor according to a preset rule to obtain an output power curve of the range extender and an output power curve of the power battery respectively, where the abscissa of the output power curve of the range extender and the output power curve of the power battery is the power allocation ratio, and the power allocation ratio is the ratio of the power of the power battery to the total power, and the total power includes the power of the power battery and the power of the range extender; determine a fuel consumption rate curve of the range extender and an equivalent fuel consumption rate curve of the power battery according to the pre-obtained range-extended power system parameters of the whole vehicle, the output power curve of the range extender, and the output power curve of the power battery; process the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain an equivalent total fuel consumption rate curve; determine a specified point in the equivalent total fuel consumption rate curve, and use the specified ratio corresponding to the specified point as the optimal power allocation ratio of the range extender and the power battery, and through the optimal power allocation ratio, realize the power following control of the range-extended power system, where the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

[0020] The above at least one technical solution adopted in the embodiments of the present specification can achieve the following beneficial effects: Through the above technical solution, the required power at the input end of the drive motor is allocated according to a preset rule to obtain an output power curve of the range extender and an output power curve of the power battery respectively, considering the power demand of the drive motor. When the power demand suddenly increases when the power battery is close to and higher than the lower boundary value of the SOC, the range extender can be used to meet the high-power demand in a short time, increasing the service life of the battery; according to the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery, an equivalent total fuel consumption rate curve is obtained. In the equivalent total fuel consumption rate curve, the specified ratio corresponding to the minimum point is used as the optimal power allocation ratio of the range extender and the power battery, reducing the number of engine starts and stops, avoiding operating in the low-efficiency area, considering the power demand of the drive motor, and after being processed by an algorithm based on the equivalent minimum fuel consumption rate, it is divided into different drive modes, with less loss of battery charge and discharge efficiency, improving the fuel economy of the whole vehicle. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments recorded in the present specification. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings:

[0022] Figure 1 Schematic flow chart of a power following control method for an extended - range power system provided by an embodiment of this specification;

[0023] Figure 2 Schematic structural diagram of an extended - range power system provided by an embodiment of this specification;

[0024] Figure 3 Schematic flow chart of another power following control method for an extended - range power system provided by an embodiment of this specification;

[0025] Figure 4 Schematic structural diagram of a power following control device for an extended - range power system provided by an embodiment of this specification. Detailed implementation manners

[0026] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. Based on the embodiments of this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this specification.

[0027] The existing control strategy for extended - range power systems is based on a constant - temperature fixed - point control strategy. According to the state of charge (SOC) of the power battery, the engine start - stop is adjusted to make the engine output a constant power. At this time, the engine efficiency is high and does not change with the change of the required power of the drive motor. Although the development and control strategy are simple, there are the following problems: First, the battery has been charging and discharging at high power, resulting in a short battery life. Second, when the SOC is near the lower boundary value, the battery will charge and discharge frequently, affecting the state of health (SOH) of the battery. In addition, the energy distribution is unreasonable, and the fuel consumption is higher than that of the power - following control strategy. This control strategy does not consider the power demand of the drive motor. When the power demand suddenly increases when the SOC is close to and higher than the lower boundary value, it is difficult for the power battery alone to meet the high - power demand in a short time, and it will also affect the battery life; in addition, efficiency losses such as generator efficiency and battery charge - discharge efficiency are not considered. The electrical energy of the battery essentially comes from the engine. After a series of efficiency losses, the equivalent fuel consumption rate will become relatively high, and the economic applicability is poor. The existing control strategy cannot meet the actual fuel consumption requirements, affects the battery service life, and has poor economic applicability.

[0028] The embodiments of this specification provide a power following control method for an extended - range power system. It should be noted that the execution subject in the embodiments of this specification can be a server or any device with data - processing capabilities. Figure 1 It is a schematic flowchart of a power following control method for an extended - range power system provided by the embodiments of this specification. Figure 2 It is a schematic structural diagram of an extended - range power system provided by the embodiments of this specification. As Figure 2 shown, the extended - range power system includes an extender and a power battery system. The extender includes an engine and a generator, and there is a mechanical connection between the engine and the generator. It should be noted that the extender is an electric vehicle component that can provide additional electric energy to increase the driving range of an electric vehicle. The extender and the power battery system are connected to the drive motor through an electrical connection, and the drive motor is connected to the vehicle through a mechanical connection with the axle. As Figure 1 shown, the power following control method for an extended - range power system provided by the embodiments of this specification mainly includes the following steps:

[0029] Step S101: Obtain the real - time operation parameters of the whole vehicle, and based on the real - time operation parameters, obtain the required power at the input end of the drive motor.

[0030] Obtaining the required power at the input end of the drive motor based on the real - time operation parameters specifically includes: calculating the rotational speed, torque, and required power at the output end of the drive motor of the whole vehicle according to the real - time operation parameters; performing interpolation calculation on the pre - obtained drive motor system efficiency MAP through the rotational speed and torque of the drive motor to obtain the drive motor efficiency; and obtaining the required power at the input end of the drive motor based on the drive motor efficiency and the required power at the output end.

[0031] Calculating the rotational speed, torque, and required power at the output end of the drive motor of the whole vehicle according to the real - time operation parameters specifically includes: calculating the real - time traction force according to the real - time vehicle speed and the vehicle driving equation in the real - time operation parameters; calculating the real - time optimal gear through the vehicle parameters in the real - time operation parameters, where the equivalent alternative fuel consumption rate corresponding to the optimal gear is the highest, and the equivalent alternative fuel consumption rate is used to represent the fuel consumption rate of the power battery replacing the fuel consumption of the extender; and calculating the rotational speed, torque, and required power at the output end of the drive motor of the whole vehicle based on the real - time traction force and the real - time optimal gear.

[0032] In an embodiment of this specification, the real - time operation parameters of the whole vehicle are obtained. The real - time operation parameters include the real - time vehicle speed vVeh and vehicle parameters. The vehicle parameters include the rolling resistance coefficient, transmission gear position and efficiency, etc. The real - time traction force Ft is calculated through the vehicle driving equation, and the real - time optimal gear is calculated, and then the rotational speed nMT, torque trqMT, and required power PMT_out at the output end of the drive motor are obtained.Figure 3 This is a schematic flowchart of another power following control method for the range extender power system provided by the embodiments of this specification. As Figure 3 shown, according to the real-time vehicle speed vVeh in the real-time operation parameters and the vehicle driving equation, the real-time traction force Ft is calculated. Here, the real-time traction force Ft is the vehicle traction force at the current moment calculated by the vehicle driving equation. Through the vehicle parameters in the real-time operation parameters, the real-time optimal gear is calculated. Among them, the equivalent alternative fuel consumption rate corresponding to the optimal gear is the highest, and this equivalent alternative fuel consumption rate is used to represent the fuel consumption rate replaced by the power battery power for the range extender. It should be noted here that by the rotational speed and torque at the front end of the axle, that is, the rotational speed and torque at the front end of the transmission, the range extender is queried to obtain the range extender fuel consumption rate and the power consumption at the power battery end. Replacing the fuel consumption with the power consumption at the power battery end, the equivalent alternative fuel consumption rate is obtained. When the equivalent alternative fuel consumption rate is the highest, the total fuel consumption is the lowest. The gear corresponding to the highest equivalent alternative fuel consumption rate is used as the real-time optimal gear. Based on the real-time traction force and the real-time optimal gear, the rotational speed, torque and output end demand power of the vehicle drive motor are calculated.

[0033] In an embodiment of this specification, according to the drive motor rotational speed nMT and torque trqMT, interpolation calculation is performed on the pre-obtained drive motor system efficiency MAP to obtain the drive motor efficiency Eff_MT. The product of the input end demand power PMT_in and the drive motor efficiency Eff_MT at the current moment is the output end demand power PMT_out. Output end demand power = rotational speed * torque / 9550. That is to say, through the drive motor efficiency and the output end demand power, the drive motor input end demand power PMT_in is obtained.

[0034] Step S102, distribute the drive motor input end demand power according to a preset rule to obtain the range extender output power curve and the power battery output power curve respectively.

[0035] Among them, the abscissa of the range extender output power curve and the power battery output power curve is the power distribution ratio, and this power distribution ratio is the ratio of the power battery power to the total power. The total power includes the power battery power and the range extender power;

[0036] In one embodiment of the present specification, after power distribution is performed with a battery terminal power distribution ratio ranging from 0 to 100%, a power battery output power curve with the distribution ratio as the abscissa and the output being the output power of the power battery at the battery terminal is obtained, that is, the distribution ratio - battery power curve; and a range extender output power curve with the distribution ratio as the abscissa and the output being the output power of the range extender APU is obtained, that is, the distribution ratio - APU power curve. It should be noted that the abscissas of the range extender output power curve and the power battery output power curve here are the power distribution ratios, and the power distribution ratio is the ratio of the power battery power to the total power, and the total power is the sum of the power battery power and the range extender power.

[0037] Step S103, determine the range extender fuel consumption rate curve and the power battery equivalent fuel consumption rate curve according to the pre-acquired range-extended power system parameters of the whole vehicle, the range extender output power curve, and the power battery output power curve.

[0038] Determine the range extender fuel consumption rate curve and the power battery equivalent fuel consumption rate curve according to the pre-acquired range-extended power system parameters of the whole vehicle, the range extender output power curve, and the power battery output power curve, which specifically includes: obtaining the range-extended power system parameters of the whole vehicle, where the range-extended power system parameters include the range extender engine fuel consumption rate MAP, the generator system efficiency MAP, and the power battery charge and discharge efficiency; obtaining the range extender power following curve according to the range extender engine fuel consumption rate MAP and the generator system efficiency MAP; obtaining the range extender fuel consumption rate curve through the range extender output power curve and the range extender power following curve, where the abscissa of the range extender fuel consumption curve is the power distribution ratio; generating the power battery equivalent fuel consumption rate curve according to the power battery charge and discharge efficiency and the power battery output power curve, where the abscissa of the power battery equivalent fuel consumption rate curve is the power distribution ratio.

[0039] In one embodiment of the present specification, the range-extended power system parameters of the whole vehicle are pre-acquired, where the range-extended power system parameters include the range extender engine fuel consumption rate MAP, the generator system efficiency MAP, and the power battery charge and discharge efficiency. It should be noted that the MAP diagram is actually an array that reflects the control settings of the unit operation parameters. For example, the motor system efficiency MAP diagram is a data curve diagram generated during motor testing, mainly used to reflect the efficiency distribution under different speeds and torques.

[0040] According to the fuel consumption rate MAP of the range extender engine and the efficiency MAP of the generator system, a power following curve of the range extender is obtained, which specifically includes: multiplying the fuel consumption rate MAP of the range extender engine and the efficiency MAP of the generator system to obtain the power following curve of the range extender. Among them, the input of the power following curve of the range extender is the power of the range extender, and the output is the fuel consumption rate of the range extender.

[0041] In an embodiment of the present specification, multiplying the fuel consumption rate MAP of the range extender engine and the efficiency MAP of the generator system obtains a power following curve of the range extender. Among them, the input of the power following curve of the range extender is the power of the range extender, and the output is the fuel consumption rate of the range extender. The power following curve curve of the range extender is composed of the most fuel-efficient points at each power of the range extender. The abscissa is the output power of the range extender, and the output is the fuel consumption rate of the range extender.

[0042] In an embodiment of the present specification, after processing the obtained distribution ratio - battery power curve and the distribution ratio - APU power curve through the battery charge and discharge efficiency Eff_Batt and the power following curve curve of the range extender, the distribution ratio - equivalent fuel consumption rate curve of the battery and the distribution ratio - range extender APU fuel consumption rate curve can be obtained respectively. That is to say, through the output power curve of the range extender and the power following curve of the range extender, the fuel consumption rate curve of the range extender is obtained. The abscissa of the fuel consumption curve of the range extender is the power distribution ratio, and the ordinate is the fuel consumption rate of the range extender; according to the battery charge and discharge efficiency and the output power curve of the power battery, an equivalent fuel consumption rate curve of the power battery is generated. The abscissa of the equivalent fuel consumption rate curve of the power battery is the power distribution ratio, and the ordinate is the equivalent fuel consumption rate of the power battery.

[0043] Step S104, process the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain an equivalent total fuel consumption rate curve.

[0044] In an embodiment of the present specification, the fuel consumption rate curve of the range extender can be called the fuel consumption MAP of the range extender, and the equivalent fuel consumption rate curve of the power battery can be called the equivalent fuel consumption MAP of the power battery. Summing the two obtained distribution ratio - fuel consumption rate MAPs obtains the distribution ratio - equivalent total fuel consumption rate Rate_all curve, that is, the equivalent total fuel consumption rate curve. In the equivalent total fuel consumption rate curve, the abscissa is the distribution ratio, and the output is the equivalent total fuel consumption rate (that is, the sum of the equivalent fuel consumption rate of the battery and the fuel consumption rate of the range extender). Find the minimum value of the equivalent total fuel consumption rate Rate_all for this curve. At this time, the distribution ratio corresponding to the minimum value is the optimal power distribution ratio.

[0045] Step S105: In the equivalent total fuel consumption rate curve, determine a specified point, and use the specified ratio corresponding to the specified point as the optimal power distribution ratio between the range extender and the power battery. Through the optimal power distribution ratio, power following control of the range-extended power system is achieved.

[0046] Among them, the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

[0047] In an embodiment of the present specification, find the minimum value of the equivalent total fuel consumption rate Rate_all in the equivalent total fuel consumption rate curve. At this time, the distribution ratio corresponding to the minimum value is the optimal power distribution ratio. Through the optimal power distribution ratio, power following control of the range-extended power system is achieved. Here, power following means changing the operating point of the engine at any time according to different demand powers, so that the output power of the range-extended system follows the vehicle's demand power, and each demand power can correspond to an optimal fuel consumption point.

[0048] Through the optimal power distribution ratio, power following control of the range-extended power system is achieved, specifically including: judging the current vehicle operation mode of the vehicle through the optimal power distribution ratio and the demand power at the input end of the drive motor; calculating the total fuel consumption under the corresponding working conditions and the change in the state of charge of the power battery in the current vehicle operation mode according to the current vehicle operation mode of the vehicle, so as to achieve power following control of the range-extended power system.

[0049] Judging the current vehicle operation mode of the vehicle through the optimal power distribution ratio and the demand power at the input end of the drive motor specifically includes: obtaining the optimal range extender output power and the optimal power battery output power through the optimal power distribution ratio and the demand power at the input end of the drive motor; determining the state of charge of the power battery of the vehicle according to the vehicle model obtained in advance, and presetting the lower boundary value of the state of charge of the power battery; judging the current vehicle operation mode of the vehicle through the demand power at the input end of the drive motor, the optimal range extender output power, the optimal power battery output power, the state of charge of the power battery, and the lower boundary value of the state of charge of the power battery. Among them, the current vehicle operation mode includes: energy recovery mode, shutdown mode, pure electric mode, hybrid drive mode, pure range-extended mode, and driving and power generation mode.

[0050] Based on the required power at the input end of the drive motor, the optimal range extender output power, the optimal power battery output power, the state of charge of the power battery, and the lower boundary value of the state of charge of the power battery, determine the current vehicle operation mode of the whole vehicle, specifically including: if the required power at the input end of the drive motor is less than 0, it is determined that the current vehicle operation mode of the whole vehicle is the energy recovery mode; if the required power at the input end of the drive motor is equal to 0, it is determined that the current vehicle operation mode of the whole vehicle is the shutdown mode; when the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is 0, it is determined that the current vehicle operation mode of the whole vehicle is the pure electric mode; when the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is greater than 0 and less than the required power at the input end of the drive motor, it is determined that the current vehicle operation mode of the whole vehicle is the hybrid drive mode; when the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is equal to the required power at the input end of the drive motor, it is determined that the current vehicle operation mode of the whole vehicle is the pure range extender mode; if the required power at the input end of the drive motor is greater than 0, and the state of charge of the power battery is less than the lower boundary value of the state of charge of the power battery, and the optimal range extender output power is 0, it is determined that the current vehicle operation mode of the whole vehicle is the driving power generation mode.

[0051] In an embodiment of the present specification, according to the power PMT_in at the input end of the drive motor and the optimal power distribution ratio, the range extender output power PAPU and the power battery output power PBatt are obtained. Based on the power PMT_in at the input end of the drive motor, the power battery SOC, the lower boundary value SOC_min of the power battery SOC, the range extender output power PAPU, the power battery output power PBatt, etc., the vehicle operation mode is judged: if PMT_in < 0, it is the energy recovery mode; if PMT_in = 0, it is the shutdown mode; when PMT_in > 0 and SOC >= SOC_min: if PAPU = 0, it is the pure electric mode; if 0 < PAPU < PMT_in, it is the hybrid drive mode; if PAPU = PMT_in, it is the pure range extender mode; if PMT_in > 0 and SOC < SOC_min and PAPU > 0, it is the driving power generation mode. According to the vehicle operation mode Mode, relevant calculations are carried out to obtain the total fuel consumption Fuel_consumption and the SOC change amount SOC_changed of the whole working condition, and this result is the optimal.

[0052] Through the above technical solution, the required power at the input end of the drive motor is distributed according to a preset rule to obtain the output power curve of the range extender and the output power curve of the power battery respectively. Considering the power demand of the drive motor, when the power demand suddenly increases when the power battery is close to and higher than the lower boundary value of the SOC, the range extender can be used to meet the high-power demand in a short time, increasing the service life of the battery; according to the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery, the equivalent total fuel consumption rate curve is obtained. In the equivalent total fuel consumption rate curve, the specified ratio corresponding to the minimum point is used as the optimal power distribution ratio of the range extender and the power battery, reducing the number of engine starts and stops and avoiding operating in the low-efficiency area. Considering the power demand of the drive motor, after being processed by the algorithm based on the equivalent minimum fuel consumption rate, it is divided into different drive modes, with less loss of battery charge and discharge efficiency, improving the fuel economy of the whole vehicle.

[0053] The embodiments of this specification also provide a power following control device for a range-extended power system, as Figure 4 shown. The device includes: 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, and the instructions are executed by the at least one processor to enable the at least one processor to:

[0054] Obtain the real-time operating parameters of the whole vehicle, and obtain the required power at the input end of the drive motor according to the real-time operating parameters; distribute the required power at the input end of the drive motor according to a preset rule to obtain the output power curve of the range extender and the output power curve of the power battery respectively. Wherein, the abscissa of the output power curve of the range extender and the output power curve of the power battery is the power distribution ratio, and the power distribution ratio is the ratio of the power battery power to the total power, and the total power includes the power battery power and the range extender power; determine the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery according to the pre-obtained range-extended power system parameters, the output power curve of the range extender and the output power curve of the power battery of the whole vehicle; process the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain the equivalent total fuel consumption rate curve; determine a specified point in the equivalent total fuel consumption rate curve, and use the specified ratio corresponding to the specified point as the optimal power distribution ratio of the range extender and the power battery, and realize the power following control of the range-extended power system through the optimal power distribution ratio, wherein the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

[0055] The embodiments of this specification also provide a non-volatile computer storage medium storing computer-executable instructions, and the computer-executable instructions are set as:

[0056] Obtain the real-time operating parameters of the whole vehicle, and based on the real-time operating parameters, obtain the required power at the input end of the drive motor; allocate the required power at the input end of the drive motor according to a preset rule to obtain the output power curve of the range extender and the output power curve of the power battery respectively. Wherein, the abscissa of the output power curve of the range extender and the output power curve of the power battery is the power allocation ratio, and the power allocation ratio is the ratio of the power of the power battery to the total power, and the total power includes the power of the power battery and the power of the range extender; determine the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery according to the obtained range-extended power system parameters of the whole vehicle, the output power curve of the range extender and the output power curve of the power battery in advance; process the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain the equivalent total fuel consumption rate curve; determine a specified point in the equivalent total fuel consumption rate curve, and use the specified ratio corresponding to the specified point as the optimal power allocation ratio of the range extender and the power battery. Through the optimal power allocation ratio, the power following control of the range-extended power system is realized, wherein the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

[0057] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the embodiments of the device, equipment, and non-volatile computer storage medium, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments.

[0058] The specific embodiments of this specification are described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve the desired results. Additionally, the processes depicted in the figures do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0059] The devices and media provided in the embodiments of this specification correspond one-to-one with the methods. Therefore, the devices and media also have beneficial technical effects similar to those of their corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be elaborated here.

[0060] Those skilled in the art should understand that the embodiments of this specification can be provided as a method, a system, or a computer program product. Therefore, this specification can take the form of an all-hardware embodiment, an all-software embodiment, or an embodiment combining software and hardware aspects. Moreover, this specification can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0061] This specification is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of this specification. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0062] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0063] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0064] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and a memory.

[0065] The memory may include non-permanent memory in the computer-readable medium, in the form of random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0066] A computer-readable medium includes permanent and non-permanent, removable and non-removable media that can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to store information accessible by a computing device. As defined herein, a computer-readable medium does not include transitory computer-readable media such as modulated data signals and carrier waves.

[0067] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0068] The above description is only one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, various changes and modifications can be made to one or more embodiments of this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included within the scope of the claims of this specification.

Claims

1. A power following control method for an extended-range power system, characterized in that, The method includes: Obtaining real-time operating parameters of the whole vehicle, and obtaining the required power at the input end of the drive motor according to the real-time operating parameters; Performing power distribution on the required power at the input end of the drive motor according to a preset rule to obtain an output power curve of the range extender and an output power curve of the power battery respectively, where the abscissa of the output power curve of the range extender and the output power curve of the power battery is the power distribution ratio, and the power distribution ratio is the ratio of the power of the power battery to the total power, and the total power includes the power of the power battery and the power of the range extender; Determining a fuel consumption rate curve of the range extender and an equivalent fuel consumption rate curve of the power battery according to the pre-obtained range-extended power system parameters of the whole vehicle, the output power curve of the range extender and the output power curve of the power battery; Processing the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain an equivalent total fuel consumption rate curve; Determining a specified point in the equivalent total fuel consumption rate curve, taking the specified ratio corresponding to the specified point as the optimal power distribution ratio of the range extender and the power battery, and realizing power following control of the range-extended power system through the optimal power distribution ratio, where the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

2. The power following control method of a range-extended power system according to claim 1, characterized in that Obtaining the required power at the input end of the drive motor according to the real-time operating parameters, specifically including: Calculating the rotational speed, torque and required power at the output end of the drive motor of the whole vehicle according to the real-time operating parameters; Performing interpolation calculation on a pre-obtained drive motor system efficiency MAP through the rotational speed and torque of the drive motor to obtain the drive motor efficiency; Obtaining the required power at the input end of the drive motor based on the drive motor efficiency and the required power at the output end.

3. A power following control method for an extended-range power system according to claim 1, characterized in that, Determining a fuel consumption rate curve of the range extender and an equivalent fuel consumption rate curve of the power battery according to the pre-obtained range-extended power system parameters of the whole vehicle, the output power curve of the range extender and the output power curve of the power battery, specifically including: Obtaining the range-extended power system parameters of the whole vehicle, where the range-extended power system parameters include a fuel consumption rate MAP of the range extender engine, a generator system efficiency MAP and a charge-discharge efficiency of the power battery; Obtaining a power following curve of the range extender according to the fuel consumption rate MAP of the range extender engine and the generator system efficiency MAP; Obtaining a fuel consumption rate curve of the range extender through the output power curve of the range extender and the power following curve of the range extender, where the abscissa of the fuel consumption curve of the range extender is the power distribution ratio; Generating an equivalent fuel consumption rate curve of the power battery according to the charge-discharge efficiency of the power battery and the output power curve of the power battery, where the abscissa of the equivalent fuel consumption rate curve of the power battery is the power distribution ratio.

4. A power following control method for an extended-range power system according to claim 1, characterized in that, Realizing power following control of the range-extended power system through the optimal power distribution ratio, specifically including: Judging the current operating mode of the whole vehicle through the optimal power distribution ratio and the required power at the input end of the drive motor; According to the current vehicle operation mode of the whole vehicle, calculate the total fuel consumption under the corresponding working conditions and the change in the state of charge of the power battery in the current vehicle operation mode, so as to realize the power following control of the range extender power system.

5. A power following control method for an extended range power system according to claim 4, characterized in that Judge the current vehicle operation mode of the whole vehicle through the optimal power distribution ratio and the required power at the input end of the drive motor, specifically including: Obtain the optimal range extender output power and the optimal power battery output power through the optimal power distribution ratio and the required power at the input end of the drive motor; Determine the state of charge of the power battery of the whole vehicle according to the vehicle model of the whole vehicle obtained in advance, and preset the lower boundary value of the state of charge of the power battery; Judge the current vehicle operation mode of the whole vehicle through the required power at the input end of the drive motor, the optimal range extender output power, the optimal power battery output power, the state of charge of the power battery, and the lower boundary value of the state of charge of the power battery, where the current vehicle operation mode includes: energy recovery mode, shutdown mode, pure electric mode, hybrid drive mode, pure range extender mode, and driving power generation mode.

6. The power following control method of a range-extended power system according to claim 5, characterized in that, Judge the current vehicle operation mode of the whole vehicle through the required power at the input end of the drive motor, the optimal range extender output power, the optimal power battery output power, the state of charge of the power battery, and the lower boundary value of the state of charge of the power battery, specifically including: If the required power at the input end of the drive motor is less than 0, it is determined that the current vehicle operation mode of the whole vehicle is the energy recovery mode; If the required power at the input end of the drive motor is equal to 0, it is determined that the current vehicle operation mode of the whole vehicle is the shutdown mode; When the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is 0, it is determined that the current vehicle operation mode of the whole vehicle is the pure electric mode; When the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is greater than 0 and less than the required power at the input end of the drive motor, it is determined that the current vehicle operation mode of the whole vehicle is the hybrid drive mode; When the required power at the input end of the drive motor is greater than 0, if the optimal range extender output power is equal to the required power at the input end of the drive motor, it is determined that the current vehicle operation mode of the whole vehicle is the pure range extender mode; If the required power at the input end of the drive motor is greater than 0, and the state of charge of the power battery is less than the lower boundary value of the state of charge of the power battery, and the optimal range extender output power is 0, it is determined that the current vehicle operation mode of the whole vehicle is the driving power generation mode.

7. A power following control method for an extended-range power system according to claim 2, characterized in that, Calculate the rotational speed, torque, and required power at the output end of the drive motor of the whole vehicle according to the real-time operation parameters, specifically including: Calculate the real-time traction force according to the real-time vehicle speed and the vehicle driving equation in the real-time operation parameters; Calculate the real-time optimal gear through the vehicle parameters in the real-time operation parameters, where the equivalent alternative fuel consumption rate corresponding to the optimal gear is the highest, and the equivalent alternative fuel consumption rate is used to represent the fuel consumption rate of the power battery replacing the range extender. Calculate the rotational speed, torque, and output terminal required power of the drive motor of the entire vehicle based on the real-time traction force and the real-time optimal gear.

8. The power following control method of a range-extended power system according to claim 3, characterized in that, Obtain the power following curve of the range extender according to the fuel consumption rate MAP of the range extender engine and the efficiency MAP of the generator system, specifically including: Multiply the fuel consumption rate MAP of the range extender engine and the efficiency MAP of the generator system to obtain the power following curve of the range extender, where the input of the power following curve of the range extender is the power of the range extender, and the output is the fuel consumption rate of the range extender.

9. A power following control device for an extended-range power system, characterized in that, The device includes: At least one processor; and, A memory communicatively connected to the at least one processor; where The memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to: Obtain the real-time operating parameters of the entire vehicle, and based on the real-time operating parameters, obtain the required power at the input terminal of the drive motor; Allocate the required power at the input terminal of the drive motor according to a preset rule to obtain an output power curve of the range extender and an output power curve of the power battery respectively, where the abscissa of the output power curve of the range extender and the output power curve of the power battery is the power allocation ratio, and the power allocation ratio is the ratio of the power of the power battery to the total power, and the total power includes the power of the power battery and the power of the range extender; Determine the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery according to the pre-obtained range-extended power system parameters of the entire vehicle, the output power curve of the range extender, and the output power curve of the power battery; Process the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain an equivalent total fuel consumption rate curve; Determine a specified point in the equivalent total fuel consumption rate curve, and use the specified ratio corresponding to the specified point as the optimal power allocation ratio of the range extender and the power battery. Through the optimal power allocation ratio, implement power following control of the range-extended power system, where the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

10. A non-volatile computer storage medium stores computer-executable instructions, characterized in that, The computer-executable instructions are set to: Obtain the real-time operating parameters of the entire vehicle, and based on the real-time operating parameters, obtain the required power at the input terminal of the drive motor; Allocate the required power at the input terminal of the drive motor according to a preset rule to obtain an output power curve of the range extender and an output power curve of the power battery respectively, where the abscissa of the output power curve of the range extender and the output power curve of the power battery is the power allocation ratio, and the power allocation ratio is the ratio of the power of the power battery to the total power, and the total power includes the power of the power battery and the power of the range extender; Determine the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery according to the pre-obtained range-extended power system parameters of the entire vehicle, the output power curve of the range extender, and the output power curve of the power battery; Process the fuel consumption rate curve of the range extender and the equivalent fuel consumption rate curve of the power battery to obtain an equivalent total fuel consumption rate curve; In the equivalent total fuel consumption rate curve, determine a specified point, and use the specified ratio corresponding to the specified point as the optimal power distribution ratio between the range extender and the power battery. Through the optimal power distribution ratio, power following control of the extended-range power system is achieved, where the equivalent total fuel consumption rate corresponding to the specified point is lower than the equivalent total fuel consumption rate of any other point in the equivalent total fuel consumption rate curve.

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