CN112572156A - Energy recovery method, energy recovery device, vehicle and storage medium - Google Patents
Energy recovery method, energy recovery device, vehicle and storage medium Download PDFInfo
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- CN112572156A CN112572156A CN202011539015.7A CN202011539015A CN112572156A CN 112572156 A CN112572156 A CN 112572156A CN 202011539015 A CN202011539015 A CN 202011539015A CN 112572156 A CN112572156 A CN 112572156A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
Abstract
The embodiment of the application provides an energy recovery method, which relates to the field of electric automobiles and comprises the following steps: when a vehicle slides or brakes, acquiring the consumed power of a high-voltage component of the vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of a battery of the vehicle and the recoverable power of the whole vehicle; obtaining the maximum allowable recovery power of a system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery; determining relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as target recovered power; and performing energy recovery based on the target recovery power. According to the method, the consumed power of the high-voltage component is taken as a part of the energy recovery power, and the power variation of the high-voltage component is considered, so that the energy recovery efficiency is improved, the endurance of the whole vehicle is increased, and the safety of a battery can be protected.
Description
Technical Field
The embodiment of the application relates to the field of electric automobiles, in particular to an energy recovery method, an energy recovery device, a vehicle and a storage medium.
Background
Under the background of advocating energy conservation, emission reduction and environmental protection, new energy electric automobiles are more and more advocated by people. The new energy electric automobile is provided with a motor, the motor has a power generation mode, and the motor starts the power generation mode in the process of braking or sliding of the vehicle, so that kinetic energy can be converted into electric energy to be stored in a battery of the vehicle, and energy recovery can be realized. The energy recovery is to convert the waste energy form which cannot be stored and reused, such as heat energy, mechanical energy, light energy and the like, into electric energy to be stored and reused.
Due to the characteristics of the battery of the electric vehicle, in order to ensure the safety of the battery and prevent the battery from failing due to overcharge of the battery under a high state of charge (SOC), the power of energy recovery is limited. The SOC may also be called a remaining capacity, which represents a ratio of a remaining dischargeable capacity after the battery is used for a certain period of time or left unused for a long time to a capacity in a fully charged state. In addition, the battery has low activity at low temperature, and the power for energy recovery is limited to some extent.
Disclosure of Invention
Embodiments of the present application provide an energy recovery method, an energy recovery device, a vehicle, and a storage medium to solve the above problems.
In a first aspect, an embodiment of the present application provides an energy recovery method, including: when the vehicle slides or brakes, acquiring the consumed power of a high-voltage component of the vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of a battery of the vehicle and the recoverable power of the whole vehicle; obtaining the maximum allowable recovery power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery; determining relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as target recovered power; energy recovery is performed based on the target recovery power.
In a second aspect, an embodiment of the present application provides an energy recovery device, including: the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the consumed power of a high-voltage component of a vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of a battery and the recoverable power of the whole vehicle when the vehicle meets an energy recovery condition; the calculation module is used for obtaining the maximum allowable recovery power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery; the determining module is used for determining relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as target recovered power; and the recovery module is used for recovering energy based on the target recovery power.
In a third aspect, an embodiment of the present application provides a vehicle, including: one or more processors; a memory; one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more applications configured to perform the method of any of claims 1 to 7.
In a fourth aspect, the present application provides a computer readable storage medium having program code stored therein, the program code being invoked by a processor to perform the method of any of claims 1 to 7.
The embodiment of the application provides an energy recovery method, an energy recovery device, a vehicle and a storage medium. The method comprises the steps that when a vehicle slides or brakes, the consumed power of a high-voltage component of the vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of a battery of the vehicle and the recoverable power of the whole vehicle are obtained; obtaining the maximum allowable recovery power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery; determining relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as target recovered power; energy recovery is performed based on the target recovery power. Therefore, the consumed power of the high-voltage component is used as a part of the energy recovery power, the energy recovery power is improved, and the endurance mileage of the whole vehicle can be increased. In addition, the consumed power of the high-voltage component is used as a part of the energy recovery power, and the power variation of the high-voltage component is considered, so that the recovered power can be effectively exceeded the recovered power limit value of the battery due to the excessive recovered power, and the safety of the battery can be effectively protected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It should be noted that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram illustrating an application environment provided by an embodiment of the present application;
FIG. 2 is a schematic flow chart diagram illustrating a method for energy recovery provided by an embodiment of the present application;
FIG. 3 illustrates a schematic diagram of an energy recovery torque MAP MAP provided by an embodiment of the present application;
FIG. 4 illustrates a schematic flow chart of a method for energy recovery according to an embodiment of the present application;
fig. 5 is a schematic flow chart illustrating S210 in an energy recovery method according to an embodiment of the present disclosure;
fig. 6 shows a schematic flow chart of S210 in an energy recovery method according to another embodiment of the present application;
fig. 7 is a schematic flow chart illustrating S210 in an energy recovery method according to another embodiment of the present application;
fig. 8 is a block diagram illustrating a structure of an energy recovery device according to an embodiment of the present disclosure;
fig. 9 is a block diagram illustrating a structure of a vehicle according to an embodiment of the present application;
fig. 10 shows a block diagram of a computer-readable storage medium according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the embodiments of the present application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating an application environment provided by an embodiment of the present application. The electric vehicle system 100 includes an electric drive system 110, an auxiliary system 120, and a battery pack system 130. The electric drive system 110 is connected to the auxiliary system 120 and the battery pack system 130, respectively. The electric drive system 110 may include, but is not limited to, an electronic controller, a power converter, an electric motor, a mechanical transmission, and wheels, and functions to efficiently convert electric energy stored in the battery into kinetic energy of the wheels, and to convert the kinetic energy of the wheels into electric energy to charge the battery when the vehicle is braked at a deceleration. Further, the electric drive system 110 may include a processor and a memory, the processor may invoke instructions, programs, sets of codes, or sets of instructions stored in the memory, as well as invoke, run, or execute data stored in the memory. The auxiliary systems 120 may include, but are not limited to, auxiliary power sources, power steering systems, navigation systems, air conditioners, lighting and defrost devices, wipers and radios, etc., by which the maneuverability and driver comfort of the vehicle may be improved. The battery pack system 130 includes a battery pack and a management system to provide energy to the electric vehicle. Among other things, the management system in the battery pack system 130 may include a processor and a memory, and the processor may call instructions, programs, sets of codes, or sets of instructions stored in the memory, and call, run, or execute data stored in the memory.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating an energy recovery method according to an embodiment of the present disclosure. The method may specifically comprise the steps of:
s110: when the vehicle slips or brakes, the consumed power of the high-voltage component of the vehicle, the power variation amount of the high-voltage component, the maximum allowable recovered power of the battery of the vehicle, and the recoverable power of the entire vehicle are acquired.
Wherein, when the vehicle slips or brakes, the electric drive system 110 can recover the energy generated by the vehicle during the slipping or braking process. The electric drive system 110 may convert this energy into electrical energy by controlling the generator and store this electrical energy in the battery. The battery can be used for the power form of the automobile, and can also be used for supplying power to power consumption equipment (such as an air conditioner, a sound system and the like) in the automobile.
Among them, the high voltage component of the vehicle may be an air conditioning system and a DC/DC system of the vehicle. The consumed power of the high voltage components may be the power required for the high voltage components to operate properly. The power variation of the high-voltage component may be a variation of power between a current time and a next time of the high-voltage component, where the next time may be set according to an actual situation, and may be a next second of the current time, or a next millisecond of the current time, and the next time is not limited in the embodiments of the present application.
Wherein the maximum allowable recovered power of the battery of the vehicle may be a maximum power that can be reached when recovering energy of the battery system. The recoverable power of the whole vehicle can be the maximum power which can be reached when the energy of the whole vehicle is recovered.
In some embodiments, the embodiment of obtaining the consumed power of the high voltage component may be: the auxiliary system 120 may calculate the power consumption of the high-voltage component according to the current and the voltage of the current high-voltage component, for example, if the current of the current high-voltage component is I and the voltage is U, the auxiliary system 120 may calculate the power consumption of the current vehicle high-voltage component from the current I and the voltage U, which is P1 — U × I.
In some embodiments, the embodiment of obtaining the power variation of the high-voltage component may be: the auxiliary system 120 may calculate the power variation of the high-voltage component according to the consumed power of the high-voltage component at the current time and the required power of the high-voltage component at the next time. The required power at the next moment is the power required by the high-voltage component when the high-voltage component normally operates at the next moment. For example, if the power consumption of the high-voltage component at the current time is P2 and the power demand of the high-voltage component at the next time is P3, the auxiliary system 120 may calculate the power variation Δ P of the high-voltage component from P2 and P3, which is P3-P2.
In other embodiments, the embodiment of obtaining the power variation of the high-voltage component may further be: the auxiliary system 120 may inquire the minimum control period of the high voltage component and calculate the power variation of the high voltage component according to the minimum control period, and more specifically, the auxiliary system 120 may inquire the maximum power variation rate of the high voltage component (system setting, set before the vehicle leaves the factory) in the database, and then the auxiliary system 120 may calculate the power variation of the high voltage component according to the minimum control period and the maximum power variation rate of the high voltage component. Wherein the minimum control period is the time when the high-voltage component completes one control, i.e. one cycle period of the input-regulated output. The minimum control period is set according to actual requirements before the vehicle leaves the factory, the minimum control period can be obtained by querying the database through the auxiliary system 120, and the minimum control period can be used for evaluating the power variation of the load of the vehicle. The minimum control period is generally a value within a range of 10ms to 1s, for example, the minimum control period may be 100ms, and the embodiment of the present application does not limit the value of the minimum control period.
In some embodiments, the maximum allowable recovered power of the battery may be obtained by: the management system in the battery pack system 130 may obtain the maximum allowable recovery power Of the battery by referring to table 1 according to at least one parameter Of the maximum voltage Of a battery, the State Of Charge (SOC) Of the battery, the State Of Health (SOH) Of the battery, and the temperature. Where SOC, also called remaining capacity, represents the ratio of the remaining dischargeable capacity after a battery has been used for a certain period of time or left unused for a long period of time to the capacity in its fully charged state, and is usually expressed in percentage. The SOH is the percentage of the full capacity of the battery relative to the rated capacity, and the SOH of a newly-shipped battery is generally 100%, and the SOH of a completely-scrapped battery is 0%. Table 1 may be stored in the vehicle, and may include various parameters of the battery and corresponding recovered power. In table 1, the first row represents SOC, the first column represents temperature of the battery, and when SOC is 0-15%, the maximum allowable recovered power of the battery is 10kw when the battery temperature is-10 degrees celsius (° c); when the SOC is 0-15% and the battery temperature is 0 ℃, the maximum allowable recovery power of the battery is 20 kw; by analogy with the secondary category, when the SOC and the battery temperature are constant, the maximum allowable recovered power of the battery is a value of a portion where a column where the value of the SOC is located and a row where the value of the battery temperature is located overlap. For example, when the temperature of the battery is 50 ℃ and the SOC is 70%, the management system in the battery pack system 130 may look up the corresponding recovered power in table 1 based on the temperature of the battery being 50 ℃ and the SOC being 70%, so that the maximum allowable recovered power of the battery may be 20 kw.
TABLE 1
In some embodiments, the embodiment of obtaining the recoverable power of the whole vehicle may be: the electric drive system 110 can calculate the recoverable power of the whole vehicle according to the current vehicle speed, the accelerator depth, the braking depth, the rolling radius of the tires of the vehicle, the speed ratio of the speed reducer, the energy recovery MAP (shown in fig. 3) and other information. The speed ratio may be a gear ratio of a final drive in a drive axle of an automobile, which is equal to a rotational angular velocity of a drive shaft to a rotational angular velocity of an axle half shaft, and also to a ratio of their rotational speeds. Wherein each model of each company may have a different design style for the energy recovery torque MAP. Under normal temperature and normal operation of components, the corresponding motor torque value when a driver releases the accelerator and steps on the brake can be shown as an energy recovery torque MAP, please refer to fig. 3, wherein the horizontal axis represents the motor rotation speed, the vertical axis represents the accelerator depth (for example, 100% represents the accelerator depth to be 100%), and the lines in the front brake quadrant and the front drive quadrant represent different brake depths. From the throttle depth, the brake depth and the motor speed, a specific point can be determined in fig. 3, which is the motor torque value, the portion shaded S1 represents the drive, and the shaded S2 represents the regenerative braking. Specifically, the electric drive system 110 may be based on a formula
And calculating the motor rotating speed of the vehicle, wherein n is the motor rotating speed, V is the vehicle speed of the vehicle, r is the rolling radius of the tire of the vehicle, and i is the speed ratio of the speed reducer. The electric drive system 110 may then query the energy recovery torque based on the motor speed, throttle depth, and brake depthThe MAP may derive motor torque values. Thereby can be according to the formula
The recoverable power of the whole vehicle is obtained. Wherein P is the recoverable power of the whole vehicle, and the unit is kilowatt (kw); n is the current motor speed in revolutions per minute (rpm); t is the current motor torque value in newton meters (Nm). As an example, as shown in fig. 3, when the motor speed is M, the accelerator depth is N, and the braking depth is the braking depth corresponding to the first line of the front braking quadrant, it can be determined from fig. 3 that the corresponding motor torque value is Q, and the electric drive system 110 can calculate the recoverable power of the entire vehicle
S120: and obtaining the maximum allowable recovery power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery.
Wherein the maximum allowable recovered power of the system may be a maximum power that can be reached when recovering energy of the system of the vehicle.
In some embodiments, following the above description of S110, the consumed power of the high-voltage component may be P1, the power variation of the high-voltage component is Δ P, and the maximum allowable recovered power of the battery is P4. The auxiliary system 120 (or the management system in the battery pack 130) may calculate the maximum allowable recovered power of the system as P5 ═ P1+ P4- Δ P according to the above parameters.
S130: and determining the relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as the target recovered power.
The target recovered power is power used for energy recovery of the electric drive system 110.
In some embodiments, the electric drive system 110 (or the auxiliary system 120) may determine whether the maximum allowable recovered power of the system is less than the recoverable power of the entire vehicle. When the maximum allowable recovery power of the system is smaller than the recoverable power of the whole vehicle, the electric drive system 110 (or the auxiliary system 120) can determine the maximum allowable recovery power of the system as the target recovery power, and because the value of the maximum allowable recovery power of the system fluctuates up and down relative to the maximum allowable recovery power of the battery and the fluctuation range is not large, the maximum allowable recovery power of the system is selected as the target recovery power at this time, so that the recovery power limit of the battery is effectively prevented from being exceeded due to the overlarge recovery power in the energy recovery process, and the safety of the battery in the recovery process can be further ensured; when the maximum allowable recovered power of the system is not less than the recoverable power of the entire vehicle, the electric drive system 110 (or the auxiliary system 120) may determine the recoverable power of the entire vehicle as the target recovered power, so that the safety of the load of the entire vehicle may be ensured while ensuring the safety of the battery.
S140: energy recovery is performed based on the target recovery power.
In some embodiments, the electric drive system 110 may control the direction (positive and negative) of the motor torque according to the target recovered power, thereby controlling the motor driving and generating.
In the embodiment, the energy recovery method obtains the consumed power of the high-voltage component of the vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of the battery of the vehicle and the recoverable power of the whole vehicle when the vehicle slips or brakes; obtaining the maximum allowable recovery power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery; determining relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as target recovered power; energy recovery is performed based on the target recovery power. Therefore, the consumed power of the high-voltage component can be used as a part of energy recovery power, the energy recovery efficiency is improved, and the endurance mileage of the vehicle can be increased. In addition, the method considers the power variation of the high-voltage component when calculating the maximum allowable recovery power of the system, can ensure that the value of the maximum allowable recovery power of the system fluctuates up and down at the maximum allowable recovery power of the battery, and the fluctuation amplitude is not large, thereby ensuring the safety of the battery.
Referring to fig. 4, fig. 4 is a schematic flow chart illustrating an energy recovery method according to an embodiment of the present application. The method may specifically comprise the steps of:
s210: when the vehicle slips or brakes, the consumed power of the high-voltage component of the vehicle, the power variation amount of the high-voltage component, the maximum allowable recovered power of the battery of the vehicle, and the recoverable power of the entire vehicle are acquired.
The high voltage components may include, among others, an air conditioning system and a DC/DC system.
In some embodiments, referring to fig. 5, the step of acquiring the power variation of the high-voltage component of the vehicle by the auxiliary system 120 may specifically include the steps shown in fig. 5:
S211A: and acquiring the air conditioner consumed power of the vehicle at the current moment and the air conditioner required power at the next moment.
As an example, the auxiliary system 120 obtaining the air conditioning demand power at the next time may include the following steps:
first, the auxiliary system 120 may obtain a first parameter of the vehicle, where the first parameter includes one or more combinations of an ambient temperature, an actual temperature of an air outlet in the vehicle, a target temperature of an air outlet in the vehicle, a maximum temperature of a battery core, a target temperature of the battery core, a refrigeration heat exchange coefficient in the vehicle, a cooling heat exchange coefficient of a battery, a working mode of the vehicle, a low-pressure of an air conditioning system, a heat generation amount of the battery, and an energy efficiency ratio of a compressor.
Preferably, the first parameter includes an ambient temperature, an actual temperature of an air outlet in the vehicle, a target temperature of the air outlet in the vehicle, a highest temperature of the battery core, a target temperature of the battery core, a refrigeration heat exchange coefficient in the vehicle, a cooling heat exchange coefficient of the battery, a working mode of the whole vehicle, a low-pressure of the air conditioning system, a heat productivity of the battery, and an energy efficiency ratio of the compressor.
Then, the auxiliary system 120 may obtain the compressor power according to the first parameter and use the compressor power as the air conditioning demand power at the next moment.
The next time may be set according to an actual situation, and may be the next second of the current time, or the next millisecond of the current time, and the specific numerical value of the next time is not limited in the embodiments of the present application.
In some embodiments, the first parameter includes an ambient temperature, an actual temperature of an air outlet in the vehicle, a target temperature of the air outlet in the vehicle, a highest temperature of a battery cell, a target temperature of the battery cell, a refrigeration heat exchange coefficient in the vehicle, a cooling heat exchange coefficient of the battery, an operating mode of the whole vehicle, a low-pressure of the air conditioning system, a heat productivity of the battery, and a compressor energy efficiency ratio. The auxiliary system 120 may adopt a Proportional-Integral-Derivative Control (PID) method, and the compressor power may be obtained by substituting the first parameter into the following formula, and may use the compressor power as the air conditioner required power at the next time.
PCompressor＝f1(T1，T2，T3，T4，T5，K1，K2，K3，PLow pressureQ1, C1) wherein T1 is the ambient temperature of the vehicle; t2 is the actual temperature of the air outlet in the vehicle; t3 is the target temperature of the air outlet in the vehicle (i.e. the air outlet temperature set by the system); t4 is the maximum temperature of the battery cell of the vehicle; t5 is the target temperature of the battery cell of the vehicle (i.e., the temperature of the system-set battery cell); k1 is the heat exchange coefficient of the refrigeration in the vehicle; k2 is the battery cooling heat exchange coefficient; k3 work modes of the whole vehicle (including quick battery charging, slow battery charging, driving and the like); pLow pressureIs the low pressure of the air conditioning system; q1 is the heat generation of the battery; c1 is the compressor energy efficiency ratio.
As an example, obtaining the required power of the air conditioner at the next moment may further include:
first, the auxiliary system 120 may obtain a second parameter of the vehicle, where the second parameter includes one or more combinations of an ambient temperature, an actual temperature of an air outlet in the vehicle, a target temperature of a battery cell, a minimum temperature of the battery cell, a working mode of the entire vehicle, a heat exchange coefficient of heating in the vehicle, a heat exchange coefficient of heating a battery, and an energy efficiency ratio of a heat pump.
Preferably, the second parameter includes an ambient temperature, an actual temperature of an air outlet in the vehicle, a target temperature of the battery cell, a lowest temperature of the battery cell, a working mode of the whole vehicle, a heat exchange coefficient of heating in the vehicle, a heat exchange coefficient of battery heating, and an energy efficiency ratio of the heat pump.
And then, obtaining the heat pump power according to the second parameter, and taking the heat pump power as the required power of the air conditioner at the next moment.
In some embodiments, the second parameter includes an ambient temperature, an actual temperature of the in-vehicle air outlet, a target temperature of the battery cell, a minimum temperature of the battery cell, an operating mode of the entire vehicle, an in-vehicle heating heat transfer coefficient, a battery heating heat transfer coefficient, and a heat pump energy efficiency ratio. The auxiliary system 120 may adopt a Proportional-Integral-Derivative Control (PID) method, and the heat pump power (or Positive Temperature Coefficient (PTC) power) may be obtained by substituting the second parameter into the following formula, and the heat pump power may be used as the required power of the air conditioner at the next time.
PHeat pump or PTC＝f2(T1，T2，T3，T5，T6，K3，K4，K5，C2)
Wherein T1 is ambient temperature; t2 is the actual temperature of the air outlet in the vehicle; t3 is the target temperature of the air outlet in the vehicle (i.e. the air outlet temperature set by the system); t5 is the target temperature of the battery cell of the vehicle (i.e., the temperature of the system-set battery cell); t6 is the lowest temperature of the battery cell of the vehicle; k3 is the working mode of the whole vehicle (quick charge, slow charge, driving, etc.); k4 is the heat exchange coefficient of heating in the vehicle; c2 is the heat pump energy efficiency ratio or PTC energy efficiency ratio.
S212A: and calculating the difference value of the air conditioner consumed power and the air conditioner required power, and determining the difference value of the air conditioner consumed power and the air conditioner required power as the power variation of the high-voltage component of the vehicle.
In some embodiments, following the above description of S211A, the required power of the air conditioner may be PPTCThe auxiliary system 120 may control the sensor to detect that the current voltage of the air conditioner is U0And a current of I0Then the air conditioner power consumption is P0＝U0×I0. The auxiliary system 120 may calculate the difference between the consumed power of the air conditioner and the required power of the air conditioner as Δ P ═ PPTC-P0And Δ P may be taken as the amount of power change of the high-voltage component of the vehicle.
In the embodiment, the obtaining of the power variation of the high-voltage component of the vehicle may be performed by obtaining the consumed power of the air conditioner at the current moment of the vehicle and the required power of the air conditioner at the next moment; and then calculating the difference value of the air conditioner consumed power and the air conditioner required power, and determining the difference value of the air conditioner consumed power and the air conditioner required power as the power variation of the high-voltage component of the vehicle. By acquiring abundant parameters and calculating the required power of the air conditioner at the next moment according to the parameters, the more accurate required power of the air conditioner at the next moment can be obtained.
In other embodiments, referring to fig. 6, the step of obtaining the power variation of the high-voltage component of the vehicle may further include the following steps:
S211B: and acquiring a minimum control period of the vehicle, wherein the minimum control period is set before the vehicle leaves a factory and is used for evaluating load power change of the vehicle. The minimum control period is the time required for the high-voltage component to rise from zero to the maximum power (the maximum power of each component is fixed and set before the vehicle leaves the factory). The minimum control period is set according to actual requirements before the vehicle leaves a factory and is used for evaluating the power variation of the load of the vehicle. The minimum control period may generally be a value between 10ms and 1s, for example, the minimum control period may be 100ms, and the embodiment of the present application does not limit the value of the minimum control period. For example, if the maximum power of the air-conditioning refrigeration is 5kw, 100ms is required for the power to rise from zero to 5kw in the air-conditioning refrigeration process, and then 100ms is the minimum control period.
In some embodiments, the auxiliary system 120 may query a database for a minimum control period for the high voltage component. As an example, when the high voltage components are the air conditioning system and the DC/DC system, the auxiliary system 120 may query the database for the control period T of the air conditioning system and the DC/DC system0。
S212B: the amount of power change of the high-voltage component of the vehicle is determined according to the minimum control period.
In some embodiments, the assistance system 120 may look up the maximum power change rate of the high voltage component in a database and calculate the amount of power change of the high voltage component of the vehicle based on the maximum power change rate of the high voltage component and the minimum control period.
As an example, when the high voltage components are the air conditioning system and the DC/DC system, and following the above description of S211B, the auxiliary system 120 may query the database for the minimum control period T of the air conditioning system and the DC/DC system0. The auxiliary system 120 may query the database for a maximum power change rate P for the vehicle's air conditioning system1Maximum power change rate of DC/DC system is P2Then the auxiliary system 120 can calculate the power variation of the air conditioning system in the minimum control period to be Δ P1＝P1×T0The power variation of the DC/DC system in the minimum control period is delta P2＝P2×T0. Further, the auxiliary system 120 may calculate the total power variation of the air conditioning system and the DC/DC system as Δ P ═ Δ P1+ΔP2And Δ P can be taken as the amount of power change of the high-voltage component.
In the present embodiment, the obtaining of the power variation amount of the high-voltage component of the vehicle may be performed by obtaining a minimum control period of the vehicle, which is set before the vehicle leaves a factory, for evaluating a load power variation of the vehicle; the amount of power change of the high-voltage component of the vehicle is determined according to the minimum control period. Therefore, the power variation of the high-voltage component can be obtained according to the minimum control period of the vehicle, PID control is not needed, computing resources are saved, computing time is shortened, energy can be saved, and the cruising mileage of the vehicle is increased.
In some embodiments, referring to fig. 7, obtaining the recoverable power of the entire vehicle may specifically include the following steps:
S211C: the motor speed and the energy recovery torque MAP of the vehicle are obtained.
The energy recovery torque MAP (shown in fig. 3) may be set before the vehicle leaves the factory according to actual requirements, and the energy recovery torque MAP is stored in the vehicle. Each model of each company may have a different energy recovery torque MAP. In the energy recovery torque MAP, the motor speed corresponds to a unique motor torque.
In some embodiments, the electric drive system 110 may obtain the current vehicle speed, the throttle depth, the braking depth, the tire rolling radius of the vehicle, and the speed ratio of the speed reducer, and may calculate the current motor speed according to the current vehicle speed, the tire rolling radius of the vehicle, and the speed ratio of the speed reducer. The electric drive system 110 may query an energy recovery torque MAP of the vehicle according to the motor rotation speed, the accelerator depth, and the brake depth to obtain a motor torque value corresponding to the motor rotation speed.
S212C: and determining a motor torque value corresponding to the motor rotating speed based on the motor rotating speed and the energy recovery torque MAP.
In some embodiments, when the motor speed is determined, the electric drive system 110 may determine a motor torque corresponding to the motor speed from the energy recovery torque MAP according to the motor speed.
S213C: and determining the recoverable power of the whole vehicle according to the motor rotating speed and the motor torque value.
In some embodiments, when the motor speed and its corresponding motor torque are determined, the electric drive system 110 may substitute the motor speed and the motor torque into the equation P ═ motor speed × motor torque/9550 to obtain the recoverable power for the entire vehicle.
In the embodiment, the recoverable power of the whole vehicle can be obtained by obtaining the motor rotating speed and the energy recovery torque MAP of the vehicle; determining a motor torque value corresponding to the motor rotating speed based on the motor rotating speed and an energy recovery torque MAP graph; and determining the recoverable power of the whole vehicle according to the rotating speed of the motor and the electrodes. Therefore, the motor torque corresponding to the motor rotating speed can be determined in the energy recovery torque MAP according to the motor rotating speed, and then the motor rotating speed and the torque value can be substituted into a general energy recovery formula to obtain the recoverable power of the whole vehicle. And for the energy recovery torque MAP, each vehicle type of each company can be designed according to actual needs, and the recoverable power of the whole vehicle determined according to different energy recovery torque MAP is different, so that the requirements of different user groups can be met. And the energy recovery torque MAP is set before the vehicle leaves the factory, the energy recovery torque MAP is fixed after the vehicle leaves the factory, the motor torque can be obtained by checking the MAP only by determining the rotating speed of the motor, and the calculation resources and the calculation time are saved, so that the energy can be saved, and the cruising mileage of the vehicle is increased.
S220: calculating the sum of the maximum allowable recovered power of the battery and the consumed power of the high-voltage component;
in some embodiments, when the maximum allowable recovered power of the battery and the consumed power of the high-voltage component are constant, the management system in the battery pack system 130 may calculate the sum of the maximum allowable recovered power of the battery and the consumed power of the high-voltage component.
S230: a difference value between the sum of the maximum allowable recovered power of the battery and the consumed power of the high-voltage component and the amount of power change of the high-voltage component is calculated, and the difference value is determined as the maximum allowable recovered power of the system.
In some embodiments, the management system in the battery pack system 130 may calculate a difference between the sum of the maximum allowable recovered power of the battery and the consumed power of the high-voltage component and the amount of power change of the high-voltage component, and may determine the difference as the maximum allowable recovered power of the system.
It should be noted that, in addition to calculating the maximum allowable recovered power of the system according to the methods of S220 and S230, the management system in the battery pack system 130 may first calculate a difference between the maximum allowable recovered power of the battery (or the consumed power of the high-voltage component) and the power variation of the high-voltage component, and then may calculate a sum of the difference and the consumed power of the high-voltage component (or the maximum allowable recovered power of the battery) to obtain the maximum allowable recovered power of the system.
S240: and determining the relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as the target recovered power.
S250: energy recovery is performed based on the target recovery power.
For detailed description of S240 and S250, please refer to S130 and S140, which are not described herein.
In the embodiment, the energy recovery method obtains the consumed power of the high-voltage component of the vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of the battery of the vehicle and the recoverable power of the whole vehicle when the vehicle slips or brakes; calculating the sum of the maximum allowable recovered power of the battery and the consumed power of the high-voltage component; calculating a difference value between the sum of the maximum allowable recovered power of the battery and the consumed power of the high-voltage component and the power variation amount of the high-voltage component, and determining the difference value as the maximum allowable recovered power of the system; determining relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as target recovered power; energy recovery is performed based on the target recovery power. The method uses the consumed power of the high-voltage component as a part of energy recovery, can improve the power of the energy recovery, and further can increase the endurance of the whole vehicle. Meanwhile, the method also considers the power variation of the high-voltage component, so that the numerical value of the maximum allowable recovery power of the system can fluctuate up and down at the maximum allowable recovery power of the battery, and the fluctuation range is small, thereby effectively preventing the recovery power from exceeding the recovery power limit value of the battery due to overlarge recovery power, and further effectively protecting the safety of the battery.
Referring to fig. 8, fig. 8 is a block diagram illustrating an energy recovery device according to an embodiment of the present disclosure. The energy recovery apparatus 300 includes an obtaining module 310, a calculating module 320, a determining module 330, and a recovering module 340. Wherein the obtaining module 310 is connected to the calculating module 320, the determining module 330 and the recycling module 340 respectively. Specifically, the method comprises the following steps:
the obtaining module 310 is configured to obtain consumed power of a high-voltage component of the vehicle, a power variation of the high-voltage component, a maximum allowable recovered power of the battery, and a recoverable power of the entire vehicle when the vehicle satisfies an energy recovery condition.
And the calculation module 320 is used for obtaining the maximum allowable recovery power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery.
And a determining module 330, configured to determine a relatively smaller recovered power of the recoverable power of the entire vehicle and the maximum allowable recovered power of the system as a target recovered power.
And a recovery module 340 for performing energy recovery based on the target recovery power.
Optionally, the obtaining module 310 may include a first obtaining sub-module and a first calculating sub-module. Wherein:
the first obtaining submodule is used for obtaining the air conditioner consumed power of the vehicle at the current moment and the air conditioner required power at the next moment.
And the first calculation submodule is used for calculating the difference value between the air conditioner consumed power and the air conditioner required power and determining the difference value between the air conditioner consumed power and the air conditioner required power as the power variation of the high-voltage component of the vehicle.
Optionally, the first obtaining sub-module may include a first obtaining unit and a first determining unit, wherein:
the first acquisition unit is used for acquiring first parameters of the vehicle, wherein the first parameters comprise one or more combinations of ambient temperature, actual temperature of an air outlet in the vehicle, target temperature of an air outlet in the vehicle, highest temperature of a battery core, target temperature of the battery core, refrigeration heat exchange coefficient in the vehicle, cooling heat exchange coefficient of a battery, working mode of the whole vehicle, low pressure of an air conditioning system, heat productivity of the battery and energy efficiency ratio of a compressor.
And the first determining unit is used for obtaining the compressor power according to the first parameter and taking the compressor power as the air conditioner required power at the next moment.
Optionally, the obtaining sub-module may further include a second obtaining unit and a second determining unit, wherein:
and the second acquisition unit is used for acquiring a second parameter of the vehicle, wherein the second parameter comprises one or more combinations of ambient temperature, actual temperature of an air outlet in the vehicle, target temperature of an electric core, lowest temperature of the electric core, working mode of the whole vehicle, heat exchange coefficient of heating in the vehicle, heat exchange coefficient of battery heating and energy efficiency ratio of a heat pump.
And the second determining unit is used for obtaining the heat pump power according to the second parameter and taking the heat pump power as the air conditioner required power at the next moment.
Optionally, the obtaining module 310 further includes a second obtaining sub-module and a second calculating sub-module, wherein:
and the second acquisition submodule is used for acquiring a minimum control period of the vehicle, and the minimum control period is set before the vehicle leaves a factory and is used for evaluating load power change of the vehicle.
And the second calculation submodule is used for determining the power variation of the high-voltage component of the vehicle according to the minimum control period.
Optionally, the calculation module 320 may include a third calculation sub-module and a fourth calculation sub-module, wherein:
and the third calculation submodule is used for calculating the sum of the maximum allowable recovery power of the battery and the consumed power of the high-voltage component.
And the fourth calculation submodule is used for calculating the difference value between the sum of the maximum allowable recovery power of the battery and the consumed power of the high-voltage component and the power variation of the high-voltage component and determining the difference value as the maximum allowable recovery power of the system.
Optionally, the obtaining module 310 may further include a third obtaining sub-module, a fifth calculating sub-module, and a sixth calculating sub-module, wherein:
and the third acquisition submodule is used for acquiring the motor rotating speed and the energy recovery torque MAP of the vehicle.
And the fifth calculation submodule is used for determining a motor torque value corresponding to the motor rotating speed based on the motor rotating speed and the energy recovery torque MAP.
And the sixth calculation submodule is used for determining the recoverable power of the whole vehicle according to the motor rotating speed and the motor torque value.
It can be clearly understood by those skilled in the art that the energy recovery device provided in the embodiment of the present application can implement each process in the foregoing method embodiment, and the specific working processes of the above-described device and module may refer to corresponding processes in the foregoing method embodiment, and are not described in detail herein.
In the embodiments provided in this application, the coupling, direct coupling or communication connection between the modules shown or discussed may be an indirect coupling or communication coupling through some interfaces, devices or modules, and may be in an electrical, mechanical or other form, and the embodiments of this application are not limited to this specifically.
In addition, each functional module in the embodiments of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated module can be realized in a form of hardware, and can also be realized in a form of a functional module of software.
Referring to fig. 9, fig. 9 is a block diagram illustrating a vehicle according to an embodiment of the present disclosure, where the vehicle 400 may be a vehicle such as an intelligent device and a server. The vehicle 400 in the present application may include one or more of the following components: a processor 410, a memory 420, and one or more applications, wherein the one or more applications may be stored in the memory 420 and configured to be executed by the one or more processors 410, the one or more programs configured to perform a method as described in the aforementioned method embodiments.
A processor may include one or more processing cores. The processor 410 interfaces with various components throughout the vehicle 400 using various interfaces and lines to execute or execute instructions, programs, code sets, or instruction sets stored in the memory 420 and to invoke execution or execution of data stored in the memory 420 to perform various functions of the vehicle 500 and to process data. Alternatively, the processor 410 may be implemented in hardware using at least one of Digital Signal Processing (DSP), field-programmable gate array (FPGA), and Programmable Logic Array (PLA). The processor 410 may integrate one or a combination of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), and a modem. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing display content; the modem is used to handle wireless communications. It is understood that the modem may not be integrated into the processor 410, but may be implemented by a communication chip. The processor 410 may be equivalent to the processor in the electric drive system 110 and the processor in the management system in the battery pack system 130 of the above embodiment.
The memory 420 may include a Random Access Memory (RAM) or a read-only memory (ROM). The memory 420 may be used to store instructions, programs, codes, code sets or instruction sets, and the memory 420 may include a program storage area and a data storage area, wherein the storage programmer may store instructions for implementing an operating system, instructions for implementing at least one function, instructions for implementing the various method embodiments described above, and the like. The storage data area may store data created by the vehicle 400 in use, and the like.
Referring to fig. 10, fig. 10 is a block diagram illustrating a structure of a computer readable storage medium according to an embodiment of the present disclosure. The computer-readable storage medium 500 stores program code that can be called by a processor to execute the methods described in the above-described method embodiments.
The computer-readable storage medium 500 may be an electronic memory such as a flash memory, an electrically-erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a hard disk, or a ROM. Alternatively, the computer-readable storage medium 500 includes a non-volatile computer-readable storage medium. The computer readable storage medium 500 has storage space for program code 510 for performing any of the method steps described above. The program code can be read from or written to one or more computer program products. The program code 510 may be compressed, for example, in a suitable form.
In summary, the energy recovery method provided by the embodiment of the present application obtains the consumed power of the high-voltage component of the vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of the battery of the vehicle, and the recoverable power of the entire vehicle when the vehicle slides or brakes; obtaining the maximum allowable recovery power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery; determining relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as target recovered power; energy recovery is performed based on the target recovery power. Therefore, the consumed power of the high-voltage component can be used as a part of energy recovery power, the energy recovery efficiency is improved, and the endurance mileage of the vehicle can be increased. In addition, the method considers the power variation of the high-voltage component when calculating the maximum allowable recovery power of the system, can ensure that the value of the maximum allowable recovery power of the system can fluctuate up and down at the maximum allowable recovery power of the battery, and has small fluctuation amplitude, thereby ensuring the safety of the battery.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method of energy recovery, comprising:
when a vehicle slides or brakes, acquiring the consumed power of a high-voltage component of the vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of a battery of the vehicle and the recoverable power of the whole vehicle;
obtaining the maximum allowable recovery power of a system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery;
determining relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as target recovered power;
and performing energy recovery based on the target recovery power.
2. The method of claim 1, wherein said obtaining a power delta for a high voltage component of the vehicle comprises:
acquiring the air conditioner consumed power of the vehicle at the current moment and the air conditioner required power of the vehicle at the next moment;
and calculating a difference value between the air-conditioning consumption power and the air-conditioning demand power, and determining the difference value between the air-conditioning consumption power and the air-conditioning demand power as a power variation of a high-voltage component of the vehicle.
3. The method according to claim 2, wherein the obtaining of the required power of the air conditioner at the next moment comprises:
acquiring a first parameter of the vehicle, wherein the first parameter comprises one or more combinations of ambient temperature, actual temperature of an air outlet in the vehicle, target temperature of an air outlet in the vehicle, highest temperature of a battery core, target temperature of the battery core, refrigeration heat exchange coefficient in the vehicle, cooling heat exchange coefficient of a battery, working mode of the whole vehicle, low pressure of an air conditioning system, heat productivity of the battery and energy efficiency ratio of a compressor;
and obtaining the power of the compressor according to the first parameter, and taking the power of the compressor as the required power of the air conditioner at the next moment.
4. The method according to claim 2, wherein the obtaining of the required power of the air conditioner at the next moment comprises:
acquiring a second parameter of the vehicle, wherein the second parameter comprises one or more combinations of ambient temperature, actual temperature of an air outlet in the vehicle, target temperature of the air outlet in the vehicle, target temperature of a battery core, lowest temperature of the battery core, working mode of the whole vehicle, heat exchange coefficient of heating in the vehicle, heat exchange coefficient of heating of a battery and energy efficiency ratio of a heat pump;
and obtaining heat pump power according to the second parameter, and taking the heat pump power as the required power of the air conditioner at the next moment.
5. The method of claim 1, wherein said obtaining a power delta for a high voltage component of said vehicle further comprises:
acquiring a minimum control period of the vehicle, wherein the minimum control period is set before the vehicle leaves a factory and is used for evaluating load power change of the vehicle;
determining a power variation amount of a high-voltage component of the vehicle according to the minimum control period.
6. The method according to any one of claims 1 to 5, wherein obtaining the maximum allowable recovered power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component, and the maximum allowable recovered power of the battery comprises:
calculating a sum of a maximum allowable recovered power of the battery and a consumed power of the high-voltage component;
calculating a difference value between a sum of the maximum allowable recovered power of the battery and the consumed power of the high voltage part and a power variation amount of the high voltage part, and determining the difference value as the maximum allowable recovered power of the system.
7. The method according to any one of claims 1 to 5, wherein the obtaining recoverable power of the entire vehicle comprises:
acquiring a motor rotating speed and an energy recovery torque MAP of the vehicle;
determining a motor torque value corresponding to the motor rotating speed based on the motor rotating speed and the energy recovery torque MAP;
and determining the recoverable power of the whole vehicle according to the motor rotating speed and the motor torque value.
8. An energy recovery device, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the consumed power of a high-voltage component of a vehicle, the power variation of the high-voltage component, the maximum allowable recovery power of a battery and the recoverable power of the whole vehicle when the vehicle meets an energy recovery condition;
the calculation module is used for obtaining the maximum allowable recovery power of the system based on the consumed power of the high-voltage component, the power variation of the high-voltage component and the maximum allowable recovery power of the battery;
the determining module is used for determining the relatively smaller recovered power in the recoverable power of the whole vehicle and the maximum allowable recovered power of the system as the target recovered power;
and the recovery module is used for recovering energy based on the target recovery power.
9. A vehicle, characterized by comprising:
one or more processors;
a memory;
one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more applications configured to perform the method of any of claims 1-7.
10. A computer-readable storage medium, having stored thereon program code that can be invoked by a processor to perform the method according to any one of claims 1 to 7.
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