CN115723736B - Hybrid power vehicle, power distribution method and device thereof and whole vehicle controller - Google Patents
Hybrid power vehicle, power distribution method and device thereof and whole vehicle controller Download PDFInfo
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Abstract
The invention discloses a power distribution method and device of a hybrid power vehicle and a whole vehicle controller, wherein the power distribution method comprises the following steps: acquiring the current speed and the current required torque of the hybrid electric vehicle; when the driving mode of the hybrid power vehicle is determined to be a parallel mode, determining a current SOC value of the power battery, and determining the current required power of the hybrid power vehicle; the output power of the engine and the operating power of the motor generator are distributed according to the current SOC value of the power battery, the current required power, and the engine economy line power of the hybrid vehicle. According to the power distribution method, the output power of the corresponding engine and the working power of the motor generator in the parallel mode are distributed according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid electric vehicle, so that the economy of the whole vehicle can be guaranteed to be excellent, the engine can be guaranteed to work at higher power when the SOC value is low or the power is high, and the electricity retention property of the whole vehicle is guaranteed.
Description
Technical Field
The present invention relates to the field of hybrid vehicles, and more particularly, to a power distribution method for a hybrid vehicle, a power distribution device for a hybrid vehicle, a computer readable storage medium, and a vehicle controller.
Background
Under the great trend of the strong development of new energy automobiles, the charging pile is not very popular, and the hybrid electric vehicle type is a relatively optimal scheme for solving the problems of green license plates, oil consumption, emission and endurance mileage in the current stage. Hybrid electric vehicles are usually a combination of an engine and one or more motor generators, and are more complex than pure electric or fuel vehicle power sources, and particularly, torque power distribution of the engine and the motor generators in a parallel mode is very critical, and the economy, the power performance and the electricity retention of the whole vehicle are related.
In the related art, a power distribution manner in a parallel mode of a hybrid electric vehicle is mainly shown in fig. 1, and the engine always outputs according to the optimal economic line power to drive a motor generator to supplement or generate residual power regardless of the magnitude relation between the required power and the optimal economic line power of the engine.
The above-described dispensing is not the most economical way under all conditions. For example, in a scenario where the driving conditions are complex, the required power may sometimes be greater than the engine economy line power and sometimes less than the engine economy line power, and then such a scenario may occur: when the required power is smaller than the economic line power of the engine, the engine adopts the economic line power output, and the motor generator is driven to generate electricity while meeting the required power; then, in the next period, the required power becomes larger than the engine economy line power, at which time the engine still adopts the economy line power output, and the motor generator output drive power is required to be supplemented to satisfy the required power. That is, in the whole process, part of the power of the engine is firstly used for generating electricity, then the motor generator is used for driving the motor generator, and the energy is converted twice, and although the engine always adopts the economical line power output, the whole efficiency of the battery and the motor generator is obviously reduced, and the energy consumption is further increased.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object Of the present invention is to provide a power distribution method for a hybrid vehicle, which distributes the output power Of the corresponding engine and the working power Of the motor generator in parallel mode according to the current SOC value Of the power battery, the current required power and the engine economy line power Of the hybrid vehicle, so as to ensure the economy Of the whole vehicle and ensure that the engine works at a higher power when the SOC (State Of Charge) is low or the power is high, thereby ensuring the electricity retention Of the whole vehicle.
A second object of the present invention is to provide a power distribution device for a hybrid vehicle.
A third object of the present invention is to propose a computer readable storage medium.
A fourth object of the present invention is to provide a vehicle controller.
A fifth object of the present invention is to propose a hybrid vehicle.
To achieve the above object, an embodiment of a first aspect of the present invention proposes a power distribution method of a hybrid vehicle including a power battery, an engine, and a motor generator, the method including: acquiring the current speed and the current required torque of the hybrid electric vehicle; determining a driving mode of the hybrid vehicle according to the current vehicle speed and the current required torque; if the driving mode of the hybrid power vehicle is a parallel mode, determining a current SOC value of a power battery and determining the current required power of the hybrid power vehicle; distributing the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current demand power and the engine economy line power of the hybrid vehicle, comprising: if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current required power is greater than the engine economy line power, determining the output power of the engine according to the engine economy line power, and determining the working power of the motor generator according to a difference value between the current required power and the engine economy line power; and if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current required power is less than or equal to the engine economy line power, determining the output power of the engine according to the current required power, and determining the working power of the motor generator to be zero.
According to the power distribution method of the hybrid vehicle, the current speed and the current required torque of the hybrid vehicle are obtained, the driving mode of the hybrid vehicle is determined according to the current speed and the current required torque, when the driving mode of the hybrid vehicle is the parallel mode, the current SOC value of the power battery is determined, the current required power of the hybrid vehicle is determined, and finally the output power of the engine and the working power of the motor generator are distributed according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid vehicle. If the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is greater than the engine economy line power, determining an output power of the engine based on the engine economy line power, and determining an operating power of the motor generator based on a difference between the current demand power and the engine economy line power. If the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is less than or equal to the engine economy line power, determining the output power of the engine according to the current demand power, and determining that the operating power of the motor generator is zero. Therefore, the method distributes the output power of the corresponding engine and the working power of the motor generator under the parallel mode according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid power vehicle, so that the economy of the whole vehicle can be guaranteed to be excellent, the engine can be guaranteed to work at higher power when the SOC value is low or the power is high, and the electricity retention property of the whole vehicle is guaranteed.
In addition, the power distribution method of the hybrid vehicle according to the above embodiment of the invention may have the following additional technical features:
according to an embodiment of the present invention, determining that a driving mode of the hybrid vehicle is a parallel mode according to the current vehicle speed and the current required torque includes: when the current speed of the hybrid vehicle is in a preset speed range, determining a preset torque range; and when the current required torque is in the preset torque range, determining that the driving mode of the hybrid vehicle is a parallel mode. Preset SOC threshold
According to one embodiment of the present invention, distributing the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current required power, and the engine economy line power of the hybrid vehicle includes: if the current SOC value of the power battery is smaller than the preset SOC threshold value and the current required power is larger than the engine economic line power, acquiring an SOC weight value and a required power weight value; determining the output power of the engine according to the engine economic line power, the SOC weight value and the required power weight value, and determining the working power of the motor generator according to the output power of the engine and the current required power.
According to one embodiment of the present invention, obtaining the SOC weight value and the required power weight value includes: acquiring a minimum allowable SOC value of the power battery and external characteristic power of the engine; and acquiring the SOC weight value according to the minimum allowable SOC value, the preset SOC threshold, the current SOC value and a first weight coefficient, and determining a required power weight value according to the external characteristic power of the engine, the economic line power of the engine, the current required power and a second weight coefficient, wherein the sum of the first weight coefficient and the second weight coefficient is 1.
According to one embodiment of the invention, the SOC weight value is determined by the following formula:
wherein, Representing the value of the SOC weight-value,Representing the preset SOC threshold value,Representing the current SOC value of the power battery,Represents a minimum allowable SOC value of the power battery,Representing the first weight coefficient.
According to some embodiments of the invention, the required power weight value is determined by the following formula:
wherein, Representing the value of the required power weight,Representing the current required power in question,Representing the external characteristic power of the engine,Representing the engine economy line power of the said engine,Representing the second weight coefficient.
According to some embodiments of the invention, the output power of the engine is determined by the following formula：
Wherein, Representing the engine economy line power of the said engine,Representing the external characteristic power of the engine,Representing the value of the SOC weight-value,Representing the required power weight value.
According to some embodiments of the invention, obtaining the operating power of the motor generator from the output power of the engine and the current demand power includes: the difference between the current demand power and the output power of the engine is taken as the operating power of the motor generator.
According to some embodiments of the invention, the distributing the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current required power, and the engine economy line power of the hybrid vehicle further includes: and if the current SOC value of the power battery is smaller than a preset SOC threshold value and the current required power is smaller than or equal to the engine economic line power, determining the output power of the engine according to the engine economic line power, and determining the working power of the motor generator according to the difference value between the engine economic line power and the current required power.
Preset SOC threshold value in order to achieve the above object, a second aspect of the present invention provides a power distribution apparatus for a hybrid vehicle, including: the first acquisition module is used for acquiring the current speed and the current required torque of the hybrid electric vehicle; the first determining module is used for determining that the driving mode of the hybrid vehicle is a parallel mode according to the current vehicle speed and the current required torque; the second determining module is used for determining the current SOC value of the power battery; a third determination module configured to determine a current required power of the hybrid vehicle; a distribution module configured to distribute an output power of an engine and an operating power of a motor generator according to a current SOC value of the power battery, the current demand power, and an engine economy line power of the hybrid vehicle, wherein if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current demand power is greater than the engine economy line power, the output power of the engine is determined according to the engine economy line power, and the operating power of the motor generator is determined according to a difference between the current demand power and the engine economy line power; and if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current required power is less than or equal to the engine economy line power, determining the output power of the engine according to the current required power, and determining the working power of the motor generator to be zero.
According to the power distribution device of the hybrid vehicle, the current speed and the current required torque of the hybrid vehicle are obtained through the first obtaining module, the driving mode of the hybrid vehicle is determined to be the parallel mode through the first determining module according to the current speed and the current required torque, the current SOC value of the power battery is determined through the second determining module, the current required power of the hybrid vehicle is determined through the third determining module, and the distribution module distributes the output power of the engine and the working power of the motor generator according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid vehicle. If the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is greater than the engine economy line power, the distribution module determines an output power of the engine based on the engine economy line power and determines an operating power of the motor generator based on a difference between the current demand power and the engine economy line power. If the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is less than or equal to the engine economy line power, the distribution module determines an output power of the engine based on the current demand power and determines that the operating power of the motor generator is zero. Therefore, the device distributes the output power of the corresponding engine and the working power of the motor generator under the parallel mode according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid power vehicle, so that the economy of the whole vehicle can be guaranteed to be excellent, the engine can be guaranteed to work at higher power when the SOC value is low or the power is high, and the electricity retention property of the whole vehicle is guaranteed.
To achieve the above object, an embodiment of the third aspect of the present invention provides a computer-readable storage medium having stored thereon a power distribution program of a hybrid vehicle, which when executed by a processor, implements the above-described power distribution method of the hybrid vehicle.
According to the computer readable storage medium, the power distribution method of the hybrid power vehicle is realized when the processor executes the power distribution program of the hybrid power vehicle, so that the economy of the whole vehicle is guaranteed to be excellent, and the engine can be guaranteed to work at higher power when the SOC is low or the power is high, thereby guaranteeing the electricity retention of the whole vehicle.
In order to achieve the above objective, an embodiment of the present invention provides a vehicle controller, which includes a memory, a processor, and a hybrid power distribution program stored in the memory and capable of running on the processor, wherein the processor implements the power distribution method of the hybrid vehicle when executing the hybrid power distribution program.
According to the whole vehicle controller provided by the embodiment of the invention, when the processor executes the power distribution program of the hybrid power, the power distribution method of the hybrid power vehicle is realized, so that the economy of the whole vehicle is ensured to be excellent, and the engine can be ensured to work at higher power when the SOC is low or the power is high, thereby ensuring the electricity retention property of the whole vehicle.
To achieve the above object, a hybrid vehicle according to a fifth aspect of the present invention includes: power battery, engine, motor generator and above-mentioned whole vehicle control unit.
The hybrid vehicle according to the embodiment of the invention may include: the power battery, the engine, the motor generator and the whole vehicle controller can ensure that the economy of the whole vehicle is excellent, and the engine works at higher power when the SOC is low or the power is high, so that the electricity retention property of the whole vehicle is ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a prior art power distribution flow for a hybrid vehicle;
FIG. 2 is a schematic diagram of mode adjustment for a hybrid vehicle according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of power distribution for a hybrid vehicle according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method of power distribution for a hybrid vehicle according to one embodiment of the present invention;
FIG. 5 is a block schematic diagram of a power distribution apparatus of a hybrid vehicle according to an embodiment of the invention;
FIG. 6 is a block diagram of a vehicle control unit according to an embodiment of the present invention;
Fig. 7 is a block schematic diagram of a hybrid vehicle according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A power distribution method of a hybrid vehicle, a power distribution apparatus of a hybrid vehicle, a computer-readable storage medium, an overall vehicle controller, and a hybrid vehicle according to embodiments of the present invention are described below with reference to the accompanying drawings.
According to some embodiments of the invention, a hybrid vehicle includes a power cell, an engine, and a motor generator.
Specifically, a motor generator in a hybrid vehicle is connected to a power battery, and is driven by electric energy inside the power battery, while an engine is driven by fuel. The motor generator can be driven by the energy of the power battery, and can also generate electricity to charge the power battery under the condition that the energy storage of the power battery is insufficient. There are three drive modules for a hybrid vehicle as shown in fig. 2: EV mode (ELECTRIC VEHICLE, electric-only module), series mode, and parallel mode. When the vehicle is in EV mode, the power battery is fully stored, the engine does not generate electricity and is not driven, and all the required torque is responsible for the motor generator, namely the motor generator is used for realizing working driving, and under the condition, at least two motor generators are arranged. When the vehicle is in the series mode, the shortage of energy storage in the power battery is indicated, the motor generator is driven by the engine to generate electricity to charge the power battery, and at the moment, all the required torque is responsible for output by the motor generator. When the vehicle is in the parallel mode, the engine and one motor generator jointly output power according to the required torque, and if necessary, part of the total output torque of the engine is used for meeting the requirement of the required torque, and the other part of the total output torque of the engine is used for generating electricity through the other motor generator to charge a power battery. In the parallel mode, one motor generator is used to output the other motor for generating electricity, which functions to bring the engine as close to the most efficient state as possible, thereby achieving the effect of saving fuel.
The hybrid vehicle can be a hybrid electric vehicle, and can be modified to use other alternative fuels, such as compressed natural gas, propane, ethanol fuel, and the like. The power distribution method of the hybrid vehicle according to the embodiment of the invention will be described in detail below by taking an oil-electric hybrid vehicle as an example.
Fig. 3 is a flowchart of a power distribution method of a hybrid vehicle according to an embodiment of the present invention.
As shown in fig. 3, the power distribution method of the hybrid vehicle according to the embodiment of the invention may include:
s1, acquiring the current speed and the current required torque of the hybrid electric vehicle.
S2, determining a driving mode of the hybrid vehicle according to the current vehicle speed and the current required torque.
And S3, if the driving mode of the hybrid vehicle is a parallel mode, determining the current SOC value of the power battery, and determining the current required power of the hybrid vehicle. Wherein the SOC value represents a state of charge of the hybrid vehicle. According to some embodiments of the invention, determining that a drive mode of a hybrid vehicle is a parallel mode based on a current vehicle speed and a current required torque includes: when the current speed of the hybrid vehicle is in a preset speed range, determining a preset torque range; when the current required torque is in a preset torque range, determining that the driving mode of the hybrid vehicle is a parallel mode, wherein the preset vehicle speed range and the preset torque range can be calibrated according to actual conditions.
Specifically, a vehicle speed range corresponding to a parallel mode of the hybrid vehicle is set first to form a preset vehicle speed range, and a table corresponding to the vehicle speed and the preset vehicle speed range in the parallel mode is pre-established according to actual application conditions because the torque range is not a fixed value and is related to the current vehicle speed. In the application process, comparing the acquired current vehicle speed with a preset vehicle speed range, when the current vehicle speed is in the preset vehicle speed range, looking up a table according to the current vehicle speed to obtain a corresponding preset torque range, further comparing the acquired current required torque with the preset torque range, and judging that the hybrid vehicle is in a parallel mode if the current required torque is also in the corresponding preset torque range.
When the hybrid vehicle is determined to be in the parallel mode, a current SOC value of the power battery is obtained. The hybrid electric vehicle divides the working phase of the power battery in the parallel mode into an electric quantity maintaining phase and an electric quantity consuming phase according to the SOC value, and the power distribution modes of the engine and the motor generator of the hybrid electric vehicle are different in the two phases, so that the current required power of the vehicle can be determined through the SOC value in the parallel mode.
In the actual judging process of the working phase of the power battery, a preset SOC threshold value of the SOC value can be preset, the obtained current SOC value is compared with the preset SOC threshold value, and the working phase of the power battery is judged according to the corresponding relation between the current SOC value and the preset SOC threshold value. For example, when the obtained current SOC value is smaller than the preset SOC threshold value, the power battery is in a charge-sustaining phase in which the hybrid vehicle is powered as much as possible with oil, i.e., as much as possible with the engine, and the motor generator is not operated or is generating electricity. When the current SOC value is greater than or equal to the preset SOC threshold, the current working stage of the power battery is an electric quantity consumption stage, and at the moment, the hybrid electric vehicle generates little or no power to reduce or avoid secondary conversion of energy, so that the overall system efficiency is improved. The preset SOC threshold value may be calibrated according to an actual situation, and may be set in advance when the vehicle leaves the factory, or may be set by a user according to an actual situation, for example, the preset SOC threshold value takes a balance point of the SOC.
In some embodiments of the present invention, the power distribution of the engine and the motor generator of the hybrid vehicle in the parallel mode may also consider map information, and if the vehicle has predicted future road condition information, the operating state of the engine and the vehicle may be adjusted in real time according to the congestion of the road condition and the length of the journey.
And S4, distributing the output power of the engine and the working power of the motor generator according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid vehicle.
If the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current required power is greater than the engine economic line power, determining the output power of the engine according to the engine economic line power, and determining the working power of the motor generator according to the difference between the current required power and the engine economic line power; if the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is less than or equal to the engine economy line power, determining the output power of the engine according to the current demand power, and determining that the operating power of the motor generator is zero.
Specifically, if the current SOC value of the power battery is greater than or equal to the preset SOC threshold value, that is, if the current working phase of the power battery is the power consumption phase, the engine economic line power is taken as the output power of the engine, and the difference between the current required power and the engine economic line power is taken as the working power of the motor generator, that is, the remaining power is supplemented by the motor generator. If the current required power is smaller than the engine economic line power, the engine outputs according to the current actual required power, and the working power of the motor generator is zero. Therefore, the mode of determining the output power of the engine by adopting the current required power reduces the efficiency of the engine, but reduces the whole energy consumption at the stage, simultaneously avoids the efficiency loss of multiple times of energy conversion, and can ensure that the engine works at larger power and electricity retention when in high power demand.
According to some embodiments of the present invention, the distributing the output power of the engine and the operating power of the motor generator according to the current operating phase of the power battery, the current required power, and the engine economy line power of the hybrid vehicle may include: acquiring an SOC weight value and a required power weight value when the current SOC value is smaller than a preset SOC threshold value and the current required power is larger than the economic line power of the engine in the current working stage of the power battery; the output power of the engine is determined according to the engine economy line power, the SOC weight value, and the required power weight value, and the operating power of the motor generator is determined according to the output power of the engine and the current required power.
According to some embodiments of the present invention, obtaining the SOC weight value and the required power weight value may include: acquiring a minimum allowable SOC value of a power battery and external characteristic power of an engine; and acquiring an SOC weight value according to the minimum allowable SOC value, the preset SOC threshold value, the current SOC value and the first weight coefficient, and determining a required power weight value according to the external characteristic power of the engine, the engine economic line power, the current required power and the second weight coefficient, wherein when the current SOC value is smaller than or equal to the minimum allowable SOC value, the power battery does not provide energy for the motor generator any more, and the sum of the first weight coefficient and the second weight coefficient is 1. The value ranges of the first weight coefficient and the second weight coefficient are [0,1], which are constants set according to actual conditions, and the value of the first weight coefficient and the second weight coefficient can be determined by comprehensively considering the economical efficiency, the dynamic property and the electricity retention property of the hybrid electric vehicle.
In some embodiments of the invention, the SOC weight value is determined by the following equation (1):
（1）
wherein, The value of the SOC weight is represented as,Indicating that the preset SOC threshold value is to be set,Representing the current SOC value of the power battery,Represents a minimum allowable SOC value of the power battery,Representing the first weight coefficient.
The required power weight value is determined by the following formula:
（2）
wherein, Representing the value of the required power weight,Indicating the current power demand of the vehicle,Represents the external characteristic power of the engine,Indicating the engine economy line power,Representing a second weight coefficient.
Specifically, when the current SOC value is smaller than the preset SOC threshold, the current working state of the power battery is determined to be the electric quantity maintaining stage, and if the current required power is larger than the engine economic line power, the current SOC value weight value and the required power weight value are calculated first, for example, the SOC weight value may be calculated by the formula (1), and the current required power weight value may be calculated by the formula (2). Then, according to the engine economic line powerExternal characteristic power of engineSOC weight valueAnd a required power weight valueCalculating the output power of an engineFor example, the formula can be passedAnd calculating, wherein the external characteristic power of the engine represents the engine output power measured when the opening degree of the throttle valve of the engine is 100%.
In the electric quantity maintaining stage, the output power of the engine is larger than the engine economic line power and smaller than the external characteristic power of the engine, and then the output power of the engine is equal to the engine economic line power plus the supplementing quantity, wherein the supplementing quantity is the SOC weight value and the required power weight value calculated and obtained in the embodiment, and the supplementing quantity is inversely related to the current SOC value and positively related to the required power according to the formula. That is, when the required power is constant, the lower the current SOC value, the higher the engine output power is, so as to generate and maintain electricity; when the current SOC value is fixed, the higher the required power in the electric quantity maintaining stage is, the higher the output power of the engine is, so that the power performance requirement is ensured.
In addition, when the output power of the engine is equal to the required power, a Pr-SOC function relationship, in particular a linear relationship, can be obtained. At this time, on the side of the linear relationship, the engine output power is larger than the required power, at which time the required power is relatively large and the SOC is relatively small, and the motor generator is in a power generation state; on the other side of the linear relationship, the engine output is less than the demand power, at which time the demand power is relatively small and the SOC is relatively large, and the motor generator is in an output state.
According to some embodiments of the invention, the operating power of the motor generator is obtained from the output power of the engine and the current demand power, further comprising: the difference between the current required power and the output power of the engine is taken as the operating power of the motor generator.
Specifically, when the current operation phase of the power battery is the charge sustaining phase and the current required power is greater than the engine economy line power, the output power of the engine is calculated by the above formula, and the operation power of the motor generator is equal to the difference between the current required power and the output power of the engine. In this operating phase, the engine output power is not equal to the engine economy line power, and the engine output power may be greater than the required power or less than the required power, and therefore, the operating efficiency of the motor generator obtained by taking the difference may be positive or negative. When the calculated operating power of the motor generator is positive, the motor generator outputs power to perform supplementary driving, and when the operating power of the motor generator is negative, the engine performs work on the motor generator to generate power.
According to some embodiments of the present invention, the distribution of the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current required power, and the engine economy line power of the hybrid vehicle further includes: if the SOC value of the power battery is less than the preset SOC threshold and the current demand power is less than or equal to the engine economy line power, the output power of the engine is determined based on the engine economy line power, and the operating power of the motor generator is determined based on the difference between the engine economy line power and the current demand power.
Specifically, when the current SOC value of the power battery is smaller than a preset SOC threshold value, the working phase of the power battery is judged to be an electric quantity maintaining phase, if the current required power is smaller than or equal to the economic line power of the engine, the economic line power of the engine is used as the output power of the engine, and the rest is the working power of the motor generator, so that the economical efficiency is guaranteed to be optimal. That is, the engine can meet the driving demand, and the remaining motor generator generates electricity, that is, the operating power of the motor generator is negative at this time. If the current demand power is equal to the engine economy line power, the calculated operating power of the motor generator is zero, indicating that the engine just meets the drive demand. Therefore, the economy is guaranteed to be excellent, the engine can be guaranteed to work at higher power at low SOC, and the electricity retention property is guaranteed.
As a specific example of the present invention, as shown in fig. 4, the power distribution method in the parallel mode of the hybrid vehicle includes the steps of:
s301, determining a current SOC value of a power battery and determining a current required power of the hybrid vehicle 。
S302, judging whether the current SOC value of the power battery is larger than a preset SOC threshold value. If yes, go to step S303; if not, step S306 is performed.
S303, judging the current required power of the hybrid vehicleWhether or not to be greater than the engine economic line power. If yes, go to step S304; if not, step S305 is performed.
S304, output power of engineOperating power of motor generator。
S305, output power of engine; Operating power of motor generator。
S306, judging the current required power of the hybrid vehicleWhether or not to be greater than the engine economic line power. If so, then step 307 is performed; if not, step 308 is performed.
S308, output power of engineOperating power of motor generator. Wherein, ，，The value of the SOC weight is represented as,Indicating that the preset SOC threshold value is to be set,Representing the current SOC value of the power battery,Represents a minimum allowable SOC value of the power battery,A first weight coefficient is represented and a second weight coefficient is represented,A weight value representing the current required power,Indicating the current power demand of the vehicle,Represents the external characteristic power of the engine,Indicating the engine economy line power,Representing a second weight coefficient.
S308, output power of engine; Operating power of motor generator。
In summary, according to the power distribution method of the hybrid vehicle of the embodiment of the invention, the current vehicle speed and the current required torque of the hybrid vehicle are obtained first, then when the driving mode of the hybrid vehicle is determined to be the parallel mode according to the current vehicle speed and the current required torque, the current SOC value of the power battery is determined, the current required power of the hybrid vehicle is determined, and finally the output power of the engine and the operating power of the motor generator are distributed according to the current SOC value of the power battery, the current required power and the engine economy line power of the hybrid vehicle. If the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is greater than the engine economy line power, determining an output power of the engine based on the engine economy line power, and determining an operating power of the motor generator based on a difference between the current demand power and the engine economy line power. If the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is less than or equal to the engine economy line power, determining the output power of the engine according to the current demand power, and determining that the operating power of the motor generator is zero. Therefore, the method distributes the output power of the corresponding engine and the working power of the motor generator under the parallel mode according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid power vehicle, so that the economy of the whole vehicle can be guaranteed to be excellent, the engine can be guaranteed to work at higher power when the SOC value is low or the power is high, and the electricity retention property of the whole vehicle is guaranteed. Corresponding to the embodiment, the invention also provides a power distribution device of the hybrid electric vehicle.
Fig. 5 is a block diagram of a power distribution apparatus of a hybrid vehicle according to an embodiment of the present invention.
As shown in fig. 5, the power distribution apparatus of a hybrid vehicle of an embodiment of the invention may include: a first acquisition module 10, a first determination module 20, a second determination module 30, a third determination module 40 and an allocation module 50.
The first acquisition module 10 is used for acquiring the current speed and the current required torque of the hybrid vehicle. The first determination module 20 is configured to determine that a driving mode of the hybrid vehicle is a parallel mode according to a current vehicle speed and a current required torque. The second determination module 30 is configured to determine a current SOC value of the power battery. The third determination module 40 is configured to determine a current demanded power of the hybrid vehicle. The distribution module 40 is configured to distribute the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current demand power, and the engine economy line power of the hybrid vehicle. The distribution module 40 is specifically configured to determine an output power of the engine according to the engine economic line power and determine an operating power of the motor generator according to a difference between the current required power and the engine economic line power if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current required power is greater than the engine economic line power; if the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is less than or equal to the engine economy line power, determining the output power of the engine according to the current demand power, and determining that the operating power of the motor generator is zero.
According to some embodiments of the present invention, the first determining module 20 determines that the driving mode of the hybrid vehicle is a parallel mode according to the current vehicle speed and the current required torque, specifically for: when the current speed of the hybrid vehicle is in a preset speed range, determining a preset torque range; when the current required torque is within the preset torque range, the driving mode of the hybrid vehicle is determined to be a parallel mode.
According to some embodiments of the present invention, the distribution module 50 distributes the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current required power and the engine economy line power of the hybrid vehicle, specifically for: if the current SOC value of the power battery is smaller than the preset SOC threshold value and the current required power is larger than the engine economic line power, acquiring an SOC weight value and a required power weight value; the output power of the engine is determined according to the engine economy line power, the SOC weight value, and the required power weight value, and the operating power of the motor generator is determined according to the output power of the engine and the current required power.
According to some embodiments of the present invention, the allocation module 50 obtains the SOC weight value and the required power weight value, specifically for: acquiring a minimum allowable SOC value of a power battery and external characteristic power of an engine; and acquiring an SOC weight value according to the minimum allowable SOC value, the preset SOC threshold value, the current SOC value and the first weight coefficient, and determining a required power weight value according to the external characteristic power of the engine, the economic line power of the engine, the current required power and the second weight coefficient, wherein the sum of the first weight coefficient and the second weight coefficient is 1.
According to some embodiments of the invention, allocation module 30 determines the SOC weight value by the following formula:
wherein, The value of the SOC weight is represented as,Indicating that the preset SOC threshold value is to be set,Representing the current SOC value of the power battery,Represents a minimum allowable SOC value of the power battery,Representing the first weight coefficient.
According to some embodiments of the present invention, the allocation module 30 determines the required power weight value by the following formula:
wherein, Representing the value of the required power weight,Indicating the current power demand of the vehicle,Represents the external characteristic power of the engine,Indicating the engine economy line power,Representing a second weight coefficient.
According to some embodiments of the invention, the distribution module 30 determines the output power of the engine by the following formula：
Wherein, Indicating the engine economy line power,Represents the external characteristic power of the engine,The value of the SOC weight is represented as,A weight value representing the current required power.
According to some embodiments of the invention, the distribution module 50 obtains the operating power of the motor generator from the output power of the engine and the current demand power, in particular for: the difference between the current required power and the output power of the engine is taken as the operating power of the motor generator.
According to some embodiments of the present invention, the distribution module 50 distributes the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current required power and the engine economy line power of the hybrid vehicle, and is specifically further configured to: if the current SOC value of the power battery is less than the preset SOC threshold and the current demand power is less than or equal to the engine economy line power, determining an output power of the engine based on the engine economy line power, and determining an operating power of the motor generator based on a difference between the engine economy line power and the output power of the engine.
It should be noted that, for details not disclosed in the power distribution device of the hybrid vehicle according to the embodiment of the present invention, please refer to details disclosed in the power distribution method of the hybrid vehicle according to the above embodiment of the present invention, and details thereof are not described herein.
According to the power distribution device of the hybrid vehicle, the current speed and the current required torque of the hybrid vehicle are obtained through the first obtaining module, the driving mode of the hybrid vehicle is determined to be the parallel mode through the first determining module according to the current speed and the current required torque, the current SOC value of the power battery is determined through the second determining module, the current required power of the hybrid vehicle is determined through the third determining module, and the distribution module distributes the output power of the engine and the working power of the motor generator according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid vehicle. If the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is greater than the engine economy line power, the distribution module determines an output power of the engine based on the engine economy line power and determines an operating power of the motor generator based on a difference between the current demand power and the engine economy line power. If the current SOC value of the power battery is greater than or equal to the preset SOC threshold and the current demand power is less than or equal to the engine economy line power, the distribution module determines an output power of the engine based on the current demand power and determines that the operating power of the motor generator is zero. Therefore, the device distributes the output power of the corresponding engine and the working power of the motor generator under the parallel mode according to the current SOC value of the power battery, the current required power and the engine economic line power of the hybrid power vehicle, so that the economy of the whole vehicle can be guaranteed to be excellent, the engine can be guaranteed to work at higher power when the SOC value is low or the power is high, and the electricity retention property of the whole vehicle is guaranteed.
The present invention also proposes a computer-readable storage medium corresponding to the above-described embodiments.
The computer-readable storage medium of the present invention has stored thereon a power distribution program of a hybrid vehicle, which when executed by a processor, implements the power distribution method of the hybrid vehicle described above.
According to the computer readable storage medium, the power distribution method of the hybrid power vehicle is realized when the processor executes the power distribution program of the hybrid power vehicle, so that the economy of the whole vehicle is guaranteed to be excellent, and the engine can be guaranteed to work at higher power when the SOC is low or the power is high, thereby guaranteeing the electricity retention of the whole vehicle.
Corresponding to the embodiment, the invention also provides a vehicle controller.
Fig. 6 is a block diagram illustrating a structure of an overall vehicle controller according to an embodiment of the present invention.
As shown in fig. 6, the vehicle controller 100 of the present invention includes a memory 110, a processor 120, and a hybrid power distribution program stored in the memory 110 and operable on the processor 120, and when the processor 120 executes the hybrid power distribution program, the above-described power distribution method of the hybrid vehicle is implemented.
According to the whole vehicle controller provided by the embodiment of the invention, when the processor executes the power distribution program of the hybrid power, the power distribution method of the hybrid power vehicle is realized, so that the economy of the whole vehicle is ensured to be excellent, and the engine can be ensured to work at higher power when the SOC is low or the power is high, thereby ensuring the electricity retention property of the whole vehicle.
Corresponding to the embodiment, the invention also provides a hybrid vehicle.
As shown in fig. 7, a hybrid vehicle 200 of an embodiment of the invention may include: a power battery 210, an engine 220, a motor generator 230, and the above-described whole vehicle controller 100.
The hybrid vehicle 200 according to the embodiment of the invention includes: the power battery 210, the engine 220, the motor generator 230 and the whole vehicle controller 100 can ensure the economy of the whole vehicle to be excellent, and can ensure that the engine works at higher power when the SOC is low or the power is high, thereby ensuring the electricity retention of the whole vehicle.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (13)
1. A power distribution method of a hybrid vehicle including a power battery, an engine, and a motor generator, characterized by comprising:
Acquiring the current speed and the current required torque of the hybrid electric vehicle;
determining a driving mode of the hybrid vehicle according to the current vehicle speed and the current required torque;
If the driving mode of the hybrid power vehicle is a parallel mode, determining a current SOC value of a power battery and determining the current required power of the hybrid power vehicle;
Distributing the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current demand power and the engine economy line power of the hybrid vehicle, comprising:
if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current required power is greater than the engine economy line power, determining the output power of the engine according to the engine economy line power, and determining the working power of the motor generator according to a difference value between the current required power and the engine economy line power;
And if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current required power is less than or equal to the engine economy line power, determining the output power of the engine according to the current required power, and determining the working power of the motor generator to be zero.
2. The power distribution method according to claim 1, characterized in that determining that the drive mode of the hybrid vehicle is a parallel mode based on the current vehicle speed and the current required torque includes:
when the current speed of the hybrid vehicle is in a preset speed range, determining a preset torque range;
And when the current required torque is in the preset torque range, determining that the driving mode of the hybrid vehicle is a parallel mode.
3. The power distribution method according to claim 1, characterized in that distributing the output power of the engine and the operating power of the motor generator according to the current SOC value of the power battery, the current required power, and the engine economy line power of the hybrid vehicle includes:
if the current SOC value of the power battery is smaller than the preset SOC threshold value and the current required power is larger than the engine economic line power, acquiring an SOC weight value and a required power weight value;
determining the output power of the engine according to the engine economic line power, the SOC weight value and the required power weight value, and determining the working power of the motor generator according to the output power of the engine and the current required power.
4. The power distribution method according to claim 3, wherein obtaining the weight value of the current SOC value and the required power weight value includes:
Acquiring a minimum allowable SOC value of the power battery and external characteristic power of the engine;
And acquiring the SOC weight value according to the minimum allowable SOC value, the preset SOC threshold, the current SOC value and a first weight coefficient, and determining a required power weight value according to the external characteristic power of the engine, the economic line power of the engine, the current required power and a second weight coefficient, wherein the sum of the first weight coefficient and the second weight coefficient is 1.
5. The power distribution method according to claim 4, wherein the SOC weight value is determined by the following formula:
Wherein k SOC represents the SOC weight value, SOC sd represents the preset SOC threshold value, SOC represents the current SOC value of the power battery, SOC low represents the minimum allowable SOC value of the power battery, and q 1 represents the first weight coefficient.
6. The power distribution method according to claim 4, wherein the required power weight value is determined by the following formula:
Where k P represents a required power weight value, P r represents the current required power, P engMax represents the external characteristic power of the engine, P Engeco represents the engine economic line power, and q 2 represents the second weight coefficient.
7. A power distribution method according to claim 3, characterized in that the output power P Eng of the engine is determined by the following formula:
PEng＝PEngeco+(PengMax－PEngeco)·(kSOC+kP)
wherein, P Engeco represents the engine economic line power, P engMax represents the external characteristic power of the engine, k SOC represents the SOC weight value, and k P represents the required power weight value.
8. A power distribution method according to claim 3, wherein obtaining the operating power of the motor generator based on the output power of the engine and the current required power includes:
The difference between the current demand power and the output power of the engine is taken as the operating power of the motor generator.
9. The power distribution method according to claim 1, characterized in that the output power of the engine and the operating power of the motor generator are distributed according to the current SOC value of the power battery, the current required power, and the engine economy line power of the hybrid vehicle, further comprising:
and if the current SOC value of the power battery is smaller than a preset SOC threshold value and the current required power is smaller than or equal to the engine economic line power, determining the output power of the engine according to the engine economic line power, and determining the working power of the motor generator according to the difference value between the engine economic line power and the current required power.
10. A power distribution apparatus of a hybrid vehicle, characterized by comprising:
the first acquisition module is used for acquiring the current speed and the current required torque of the hybrid electric vehicle;
The first determining module is used for determining that the driving mode of the hybrid vehicle is a parallel mode according to the current vehicle speed and the current required torque;
The second determining module is used for determining the current SOC value of the power battery;
a third determination module configured to determine a current required power of the hybrid vehicle;
A distribution module configured to distribute an output power of an engine and an operating power of a motor generator according to a current SOC value of the power battery, the current demand power, and an engine economy line power of the hybrid vehicle, wherein if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current demand power is greater than the engine economy line power, the output power of the engine is determined according to the engine economy line power, and the operating power of the motor generator is determined according to a difference between the current demand power and the engine economy line power;
And if the current SOC value of the power battery is greater than or equal to a preset SOC threshold value and the current required power is less than or equal to the engine economy line power, determining the output power of the engine according to the current required power, and determining the working power of the motor generator to be zero.
11. A computer-readable storage medium, characterized in that a power distribution program of a hybrid vehicle is stored thereon, which, when executed by a processor, implements the power distribution method of a hybrid vehicle according to any one of claims 1-9.
12. A vehicle control unit, characterized by comprising a memory, a processor and a hybrid power distribution program stored on the memory and operable on the processor, wherein the processor, when executing the hybrid power distribution program, implements the power distribution method of the hybrid vehicle according to any one of claims 1-9.
13. A hybrid vehicle characterized by comprising: a power battery, an engine, a motor generator, and the vehicle control unit according to claim 12.
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