CN112810600A

CN112810600A - Power control method and system, vehicle, and storage medium

Info

Publication number: CN112810600A
Application number: CN201911121914.2A
Authority: CN
Inventors: 张文玲; 刘建国; 黄建; 陈明文
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2021-05-18
Anticipated expiration: 2039-11-15
Also published as: CN112810600B

Abstract

The embodiment of the invention provides a power control method and system, a vehicle and a storage medium, wherein the power control method comprises the following steps: acquiring an ambient temperature and a power battery SOC value; determining a critical SOC value corresponding to the environment temperature; and controlling the BSG motor to start the engine under the condition that the SOC value of the power battery is smaller than the critical SOC value. According to the embodiment of the invention, the low-temperature breakdown fault of the hybrid power vehicle can be avoided, the risk of over-discharge of the power battery can be avoided, and the service life of the power battery is prolonged.

Description

Power control method and system, vehicle, and storage medium

Technical Field

The present invention relates to the field of vehicle technologies, and in particular, to a power control method, a power control system, a vehicle, and a storage medium.

Background

With the development of vehicle technology, hybrid vehicles are popular with users due to high fuel economy and excellent driving performance.

In a hybrid vehicle, a BSG (Belt Driven Starter Generator) motor can have start-stop, power-assisting and power-generating functions, that is, the BSG motor can drive a power battery to drive an engine to rotate, start and stop the engine, provide power under abnormal conditions (such as a sudden increase of torque demand), and charge the power battery under the driving of the engine. In practical applications, the BSG motor usually requires a power battery to provide a large output power when starting the engine.

However, when the power battery is at a low temperature (0 ℃ to-35 ℃), when the SOC (state of charge) value of the power battery is low, the discharge capacity of the power battery is difficult to meet the requirement of the BSG motor for starting the engine, and further, the low-temperature breakdown of the hybrid vehicle is easily caused, and the use experience of a user is reduced.

Disclosure of Invention

In order to solve the problem that the conventional hybrid vehicle is easy to have low-temperature breakdown fault, the embodiment of the invention provides a power control method and system, the hybrid vehicle and a storage medium.

In order to solve the above problem, an embodiment of the present invention discloses, in a first aspect, a power control method for a hybrid vehicle, including:

acquiring an ambient temperature and a power battery SOC value;

determining a critical SOC value corresponding to the environment temperature;

and controlling the BSG motor to start the engine under the condition that the SOC value of the power battery is smaller than the critical SOC value.

In a second aspect, an embodiment of the present invention further discloses a power control system for a vehicle, where the vehicle includes: an engine; the BSG motor is connected with the engine; the power battery is connected with the BSG motor; characterized in that the power control system comprises:

the vehicle control unit is respectively connected with the power battery and the BSG motor, and is used for acquiring an ambient temperature and a power battery SOC value, determining a critical SOC value corresponding to the ambient temperature, and controlling the BSG motor to start the engine under the condition that the power battery SOC value is smaller than the critical SOC value.

In a third aspect, an embodiment of the present invention further provides a vehicle, including: an engine; the BSG motor is connected with the engine; the power battery is connected with the BSG motor; and the power control system described above; wherein the content of the first and second substances,

the power control system comprises a vehicle control unit, the vehicle control unit is respectively connected with the power battery and the BSG motor, and the vehicle control unit is used for acquiring an ambient temperature and a power battery SOC value, determining a critical SOC value corresponding to the ambient temperature, and controlling the BSG motor to start the engine under the condition that the power battery SOC value is smaller than the critical SOC value.

In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium for a vehicle, the storage medium having instructions stored therein, which when executed, the vehicle executes the above-described power control method.

The embodiment of the invention has the following advantages:

in the embodiment of the invention, the ambient temperature and the SOC value of the power battery are obtained; determining a critical SOC value corresponding to the environment temperature; and under the condition that the SOC value of the power battery is smaller than the critical SOC value, the BSG motor is controlled to start the engine, so that the problem that the hybrid vehicle has a low-temperature breakdown fault caused by the condition that the SOC value of the power battery is too low and the discharge capacity of the power battery cannot meet the requirement of starting the engine by the BSG motor in the prior art is solved.

Drawings

FIG. 1 is a flow chart of the steps of one embodiment of a power control method of the present invention;

FIG. 2 is a flow chart of steps in another embodiment of a power control method of the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of a power control system of the present invention;

fig. 4 is a schematic view of a vehicle of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

Referring to fig. 1, a flow chart of steps of an embodiment of a power control method of the present invention is shown, the power control method may be used for a vehicle, the vehicle may be a hybrid vehicle, and the power control method may specifically include the steps of:

step 101: and acquiring the ambient temperature and the SOC value of the power battery.

In practical applications, the ambient temperature may be an ambient temperature of the hybrid vehicle, and the power battery may be a power battery in the hybrid vehicle. Specifically, the power battery may be any one of a lithium iron phosphate battery and a ternary polymer lithium battery. The ternary polymer lithium battery has the advantages of stable performance, small size, light weight and low cost, and the ternary polymer lithium battery can be preferably used as the power battery in the embodiment of the invention.

In the embodiment of the present invention, a Battery Management module (BMS) and a temperature sensor may be further disposed in the hybrid vehicle, the BMS may be respectively connected to the temperature sensor and the power Battery, and during a driving process of the hybrid vehicle, the BMS may acquire the ambient temperature and the SOC value of the power Battery through the temperature sensor.

Specifically, the SOC value, also called the remaining capacity, represents a ratio of the remaining dischargeable capacity after the 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 as a percentage. The battery is generally represented by one byte, namely a hexadecimal system of two bits (the value range is 0-100), the meaning is that the residual capacity is 0% -100%, when the SOC is 0, the battery is completely discharged, and when the SOC is 100%, the battery is completely full.

In practical application, under the same environmental temperature, the larger the SOC value of the power battery is, the more the remaining capacity of the power battery is, and the stronger the discharge capacity is.

Step 102: and determining a critical SOC value corresponding to the environment temperature.

In practical applications, the critical SOC value may be a minimum SOC value at which the power battery can normally start the BSG motor. Before the hybrid vehicle leaves a factory, different environmental temperatures can be measured through a whole vehicle test, the power battery can start the critical SOC value of the BSG motor, the corresponding relation between the environmental temperature and the critical SOC value is obtained, and the corresponding relation between the environmental temperature and the critical SOC value is stored in the BMS in advance.

In the embodiment of the present invention, since the correspondence relationship between the ambient temperature and the threshold SOC value is stored in the BMS in advance, the BMS may determine the threshold SOC value corresponding to the ambient temperature after detecting the ambient temperature of the hybrid vehicle.

For example, if the BMS stores that the threshold SOC value corresponding to the ambient temperature of-10 ℃ is 15%, when the ambient temperature of the hybrid vehicle is-10 ℃, the threshold SOC value corresponding to-10 ℃ may be determined to be 15%, and so on, the threshold SOC values corresponding to different ambient temperatures may be determined.

Step 103: and controlling the BSG motor to start the engine under the condition that the SOC value of the power battery is smaller than the critical SOC value.

In practical applications, when the SOC value of the power battery is too small, it may be considered that the remaining capacity of the power battery is insufficient, the discharge capability is weak, there may be a risk that the BSG motor cannot be started by the power battery, and the hybrid vehicle may have a breakdown. And when the real-time SOC value is equal to or greater than the critical SOC value, the residual capacity of the power battery is considered to be sufficient, the discharging capacity is strong, and the power battery can normally start the BSG motor.

In an embodiment of the present invention, a Vehicle Control Unit (VCU) may be further disposed in the Hybrid vehicle, the vehicle control unit is respectively connected to the BMS and the BSG motor, and when the real-time SOC value is smaller than the critical SOC value, the vehicle control unit may control the BSG motor to start an engine, and switch a driving Mode of the Hybrid vehicle from an all-Electric driving Mode (EV) to a Hybrid driving Mode (HEV), so as to provide power for the Hybrid vehicle together with the power battery through the engine and charge the power battery, thereby improving the SOC value and the discharging capability of the power battery, and avoiding a low-temperature anchor rejection fault of the Hybrid vehicle.

In practical applications, when the SOC of the power battery is smaller than the critical SOC, not only may the power battery not start the BSG motor, but also the SOC of the power battery may further decrease and the power battery may be overdischarged if the hybrid vehicle continues to be driven by only the power battery.

Specifically, the overdischarge refers to gradual release of stored electric energy and a slow voltage drop when the battery is discharged. When the voltage drops to a predetermined value, the discharge is stopped and the battery is recharged to restore the energy storage state of the battery. If the discharge is continued below the predetermined value, i.e., if the discharge is excessive, overdischarge may cause damage to the electrode active material, lose the reaction capability, and shorten the life of the battery.

In the embodiment of the invention, after the engine is started, the BSG battery can charge the power battery under the driving of the engine, so that the electric quantity of the power battery is increased, meanwhile, the power of the engine can be coupled with the power of the power battery to provide driving power for the hybrid vehicle together, and the discharge quantity of the power battery is further reduced, so that the danger of over-discharge of the power battery can be avoided, and the service life of the power battery is prolonged.

In summary, the power control method according to the embodiment of the present invention at least includes the following advantages:

in the embodiment of the invention, the ambient temperature and the SOC value of the power battery are obtained; determining a critical SOC value corresponding to the environment temperature; and under the condition that the SOC value of the power battery is smaller than the critical SOC value, controlling a BSG motor to start an engine so as to provide power for the hybrid vehicle through the engine and charge the power battery, improving the SOC value and the discharge capacity of the power battery, avoiding the low-temperature breakdown fault of the hybrid vehicle, avoiding the over-discharge risk of the power battery and prolonging the service life of the power battery.

Example two

Referring to fig. 2, a flow chart of steps of another embodiment of a power control method of the present invention, which may be used in a hybrid vehicle, may specifically include the steps of:

step 201: and acquiring the ambient temperature and the SOC value of the power battery.

Specifically, the implementation process of step 201 may refer to step 101 in the first embodiment, which is not described herein again.

Step 202: and determining a temperature interval to which the environment temperature belongs, wherein the temperature interval is preset.

In practical applications, the ambient temperature of the hybrid vehicle may be set in advance to a plurality of temperature ranges.

For example, the temperature interval may include: a temperature range above 0 ℃, a temperature range from 0 ℃ to-10 ℃, a temperature range from-10 ℃ to-20 ℃, a temperature range from-20 ℃ to-30 ℃ and a temperature range below-30 ℃.

In the embodiment of the invention, the temperature interval to which the ambient temperature belongs can be determined according to the ambient temperature acquired in real time.

For example, in the case where the ambient temperature is-5 ℃, it may be determined that the ambient temperature belongs to a temperature range of 0 ℃ to-10 ℃.

Step 203: and determining a critical SOC value corresponding to the temperature interval, wherein the corresponding relation between the temperature interval and the critical SOC value is preset.

In the embodiment of the present invention, a corresponding critical SOC value may be set for each temperature interval, and a corresponding relationship between the temperature interval and the critical SOC value may be stored in the BMS, so that after the temperature interval to which the ambient temperature belongs is determined, the corresponding relationship between the temperature interval and the critical SOC value in the BMS may be called to determine the SOC value corresponding to the temperature interval.

In the embodiment of the invention, the environment temperature is set into a plurality of temperature intervals, and the critical SOC values corresponding to the temperature intervals are set, so that the environment temperature in the same temperature interval can share one critical SOC value, and the corresponding relation between the environment temperature and the critical SOC value is simpler. Thus, after the ambient temperature is obtained, since the correspondence between the ambient temperature and the critical SOC value is relatively simple, the efficiency of determining the critical SOC value corresponding to the ambient temperature can be improved, and further, the control efficiency of the power control method can be improved.

For example, if the BMS stores a critical SOC value of 15% corresponding to a temperature range from 0 ℃ to-10 ℃, it may be determined that the critical SOC value corresponding to the temperature range is 15% when the temperature range is from 0 ℃ to-10 ℃, and so on, and may determine the critical SOC values corresponding to different temperature ranges.

Optionally, the correspondence between the temperature interval and the critical SOC value may be obtained by:

step S11: and determining a theoretical SOC value of the temperature interval.

Specifically, the ambient temperature of the hybrid vehicle may be set to a plurality of temperature zones according to a driving application scenario of the hybrid vehicle.

In the embodiment of the invention, the theoretical SOC values corresponding to the power battery in different temperature intervals can be measured through a whole vehicle test before the hybrid power vehicle leaves a factory. Specifically, the theoretical SOC value refers to an SOC value at which the power battery can theoretically start the BSG motor in the temperature range.

In an alternative implementation of the embodiment of the present invention, the theoretical SOC value of the temperature interval may be determined by the following method.

First, a plurality of SOC values are set.

In practical applications, the SOC value of the power battery may be set to a plurality of SOC values according to actual conditions, for example, the plurality of SOC values may be 5%, 10%, 15%, 20%, 25%, 30%, and the like. Then, testing the output power of the power battery at each SOC value at the lowest temperature of the temperature interval.

Specifically, the lower the ambient temperature is, the power battery starts the BSG battery the higher the output power is, the larger the power battery SOC value is, so in practical application, the output power of the power battery at each SOC value can be tested at the lowest temperature within the temperature interval at the test stage of the whole vehicle test.

For example, for the temperature range of-10 ℃ to-20 ℃, the output power of the power battery at the SOC values of 5%, 10%, 15%, 20%, 25% and 30% at-10 ℃ can be tested.

And then testing the required power required by the power battery to start the BSG motor at each SOC value at the lowest temperature of the temperature interval.

Specifically, the required power required by the power battery to start the BSG motor at each SOC value may be measured at a vehicle test stage.

For example, for the temperature range of-10 ℃ to-20 ℃, the required power required by the power battery to start the BSG motor can be tested at-10 ℃ and the SOC values of the power battery are 5%, 10%, 15%, 20%, 25% and 30%.

And finally, determining the minimum SOC value corresponding to the condition that the required power of the power battery is less than or equal to the output power as the theoretical SOC value of the temperature interval.

In the embodiment of the invention, the minimum SOC value corresponding to the condition that the required power of the power battery is less than or equal to the output power can be determined as the theoretical SOC value of the temperature interval.

For example, for the temperature interval of-10 ℃ to-20 ℃, in the case that the required power of the power battery is measured to be less than or equal to the minimum SOC value of 15% corresponding to the output power at-10 ℃, 15% can be determined as the theoretical SOC value of the temperature interval of-10 ℃ to-20 ℃.

Specifically, for different temperatures, the power battery can start the BSG motor when the power battery SOC is at the critical SOC point (i.e. the required power of the power battery is just less than or equal to the output power); under the condition that the SOC of the power battery is larger than the critical SOC value (namely the required power of the power battery is larger than the output power), the power battery can start the BSG motor at any time, and at the moment, a whole vehicle VCU controls the hybrid vehicle to be in an EV mode or an HEV mode; after the power battery starts the BSG motor, the engine provides power output for the hybrid power vehicle, and meanwhile the power battery is charged through the BSG motor, so that the power output of the power battery is guaranteed when the power battery is started next time.

Step S12: and determining a critical SOC value corresponding to the temperature interval according to the theoretical SOC value.

In the embodiment of the invention, in consideration of the fact that the actual driving conditions of the hybrid vehicle are more complex than laboratory conditions in the actual driving process, after the theoretical SOC value corresponding to the temperature interval is measured under the laboratory conditions before leaving the factory, the theoretical SOC value can be multiplied by a proper safety factor (greater than 1), or the theoretical SOC value is expanded by a proper amount to obtain a critical SOC value corresponding to the temperature interval, so that the power battery can normally start the BSG motor when the power battery SOC value is greater than or equal to the critical SOC value in the actual driving process.

For example, it is assumed that the theoretical SOC value corresponding to a temperature range of 0 ℃ or higher is 5%, the theoretical SOC value corresponding to a temperature range of 0 ℃ to-10 ℃ is 10%, the theoretical SOC value corresponding to a temperature range of-10 ℃ to-20 ℃ is 15%, and the theoretical SOC value corresponding to a temperature range of-20 ℃ to-30 ℃ is 20%. In practical application, the critical SOC value corresponding to the temperature range above 0 ℃ may be 10%, the critical SOC value corresponding to the temperature range from 0 ℃ to-10 ℃ may be 15%, the critical SOC value corresponding to the temperature range from-10 ℃ to-20 ℃ may be 20%, the critical SOC value corresponding to the temperature range from-20 ℃ to-30 ℃ may be 25%, and the critical SOC value corresponding to the temperature range below-30 ℃ may be 30%.

Of course, in practical applications, the theoretical SOC of the temperature interval may also be used as the critical SOC value of the temperature interval, which is not limited in the embodiment of the present invention.

Step 204: and controlling the BSG motor to start the engine under the condition that the SOC value of the power battery is smaller than the critical SOC value.

Specifically, the implementation process of step 204 may refer to step 103 in the first embodiment, which is not described herein.

Step 205: and under the condition that the SOC value of the power battery is greater than or equal to the critical SOC value, stopping controlling the BSG motor to start the engine.

In the embodiment of the invention, after the engine is started, the BSG battery can charge the power battery under the driving of the engine, so as to increase the electric quantity of the power battery, and meanwhile, the power of the engine can be coupled with the power of the power battery to provide driving power for the hybrid vehicle together, so as to further reduce the discharge quantity of the power battery, therefore, after the engine is started, the electric quantity of the power battery can be increased, that is, the SOC value of the power battery can be increased.

In practical application, the hybrid vehicle is driven by the power battery, so that better fuel economy is achieved. Therefore, after the engine is started, the vehicle control unit may stop controlling the BSG motor to start the engine when the SOC value of the power battery is greater than or equal to the critical SOC value, and switch the driving mode of the hybrid vehicle from the hybrid driving mode to the full electric driving mode to power the hybrid vehicle through the power battery, so as to improve the energy utilization degree of the power battery, and further, improve the fuel economy of the hybrid vehicle.

in the embodiment of the invention, the ambient temperature and the SOC value of the power battery are obtained; determining a target temperature interval to which the environment temperature belongs; determining a critical SOC value corresponding to the target temperature interval; and under the condition that the SOC value of the power battery is smaller than the critical SOC value, controlling a BSG motor to start an engine so as to provide power for the hybrid vehicle through the engine and charge the power battery, improving the SOC value and the discharge capacity of the power battery, avoiding the low-temperature breakdown fault of the hybrid vehicle, avoiding the over-discharge risk of the power battery and prolonging the service life of the power battery. Further, when the power battery SOC value is greater than or equal to the threshold SOC value, the BSG motor may be stopped from being controlled to start the engine, so that the energy utilization degree of the power battery may be improved, and further, the fuel economy of the hybrid vehicle may be improved.

It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.

EXAMPLE III

Referring to fig. 3, a schematic structural diagram of an embodiment of a power control system of the present invention is shown, which may be used in a vehicle that may include: an engine 30; the BSG motor 31, the BSG motor 31 is connected with the engine 30, specifically, the BSG motor 31 may be connected with the engine 30 by a belt; the power battery 32, the power battery 32 is connected with the BSG motor 31, and the power control system may specifically include: the vehicle control unit 34 is connected to the power battery 32 and the BSG motor 31, and the vehicle control unit 34 may be configured to acquire an ambient temperature and a power battery SOC value, determine a critical SOC value corresponding to the ambient temperature, and control the BSG motor 31 to start the engine 30 when the power battery SOC value is smaller than the critical SOC value.

In the embodiment of the present invention, the vehicle may be a hybrid vehicle, a temperature sensor and a BMS 33 may be further disposed in the hybrid vehicle, the BMS 33 may be respectively connected to the temperature sensor and the power battery 32, and during the driving of the hybrid vehicle, the BMS 33 may acquire the ambient temperature through the temperature sensor, acquire a power battery SOC value, and transmit the ambient temperature and the power battery SOC value to the vehicle controller 34.

In practical applications, the critical SOC value may be a minimum SOC value at which the power battery 32 can normally start the BSG motor 31. Before the hybrid vehicle leaves a factory, the critical SOC value of the BSG motor 31 can be started by the power battery 32 through a whole vehicle test under different environmental temperatures, the corresponding relation between the environmental temperature and the critical SOC value is obtained, and the corresponding relation between the environmental temperature and the critical SOC value is stored in the BMS 33 in advance.

In the embodiment of the invention, under the condition that the SOC value of the power battery is too small, the remaining capacity of the power battery 32 is considered to be insufficient, the discharging capability is weak, the risk that the power battery 32 cannot normally start the BSG motor 31 may exist, and the hybrid vehicle may have a breakdown. And under the condition that the power battery SOC value is equal to or higher than the critical SOC value, it can be considered that the remaining capacity of the power battery 32 is sufficient, the discharging capability is strong, and the power battery 32 can normally start the BSG motor 31.

In practical applications, the vehicle control unit 34 is connected to the BMS 33 and the BSG motor 31, respectively, and in case that the real-time SOC value is smaller than the critical SOC value, the vehicle control unit 34 may control the BSG motor 31 to start the engine 30, switch the driving mode of the hybrid vehicle from the all-electric driving mode to the hybrid driving mode, so as to power the hybrid vehicle through the engine 30 and the power battery 32 together and charge the power battery 32, improve the SOC value and the discharge capacity of the power battery 32, and avoid a low-temperature breakdown failure of the hybrid vehicle.

In the embodiment of the invention, after the engine 30 is started, the BSG battery 31 can charge the power battery 32 under the driving of the engine 30, so as to increase the electric quantity of the power battery 32, and meanwhile, the power of the engine 30 can be coupled with the power of the power battery 32 to provide driving power for the hybrid vehicle, so as to further reduce the discharge capacity of the power battery 32, thereby avoiding the risk of over-discharge of the power battery 32 and prolonging the service life of the power battery 32.

Optionally, the vehicle control unit 34 may be further configured to determine a temperature interval to which the ambient temperature belongs, where the temperature interval is preset, and determine a critical SOC value corresponding to the temperature interval, where a corresponding relationship between the temperature interval and the critical SOC value is preset.

Optionally, the vehicle control unit 34 may also be configured to determine a theoretical SOC value of the temperature interval; and determining a critical SOC value corresponding to the temperature interval according to the theoretical SOC value.

Optionally, the vehicle control unit 34 may also be used to set a plurality of SOC values; testing the output power of the power battery under each SOC value at the lowest temperature of the temperature interval; testing the required power required by the power battery to start the BSG motor under each SOC value under the lowest temperature of the temperature interval; and determining the SOC value corresponding to the condition that the required power of the power battery is greater than the output power as the theoretical SOC value of the temperature interval.

Alternatively, after the engine 30 is started, the vehicle control unit 34 may be further configured to stop controlling the BSG motor to start the engine when the power battery SOC is greater than or equal to the threshold SOC, so as to improve the energy utilization degree of the power battery 32, and thus, improve the fuel economy of the hybrid vehicle.

In summary, the power control system according to the embodiment of the present invention may include at least the following advantages:

in the embodiment of the invention, the vehicle control unit can obtain the ambient temperature and the SOC value of the power battery; determining a critical SOC value corresponding to the environment temperature; and under the condition that the SOC value of the power battery is smaller than the critical SOC value, controlling a BSG motor to start an engine so as to provide power for the hybrid vehicle through the engine and charge the power battery, improving the SOC value and the discharge capacity of the power battery, avoiding the low-temperature breakdown fault of the hybrid vehicle, avoiding the over-discharge risk of the power battery and prolonging the service life of the power battery.

EXAMPLE III

Referring to fig. 4, there is shown a schematic structural view of a vehicle of the present invention, which may include: an engine 30; the BSG motor 31, the BSG motor 31 is connected with the engine 30; the power battery 32, the power battery 32 is connected with the BSG motor 31; and the power control system comprises a vehicle control unit 34, wherein the vehicle control unit 34 is connected with the power battery 32 and the BSG motor 31, and the vehicle control unit 34 is configured to acquire an ambient temperature and a power battery SOC value, determine a critical SOC value corresponding to the ambient temperature, and control the BSG motor to start the engine when the power battery SOC value is smaller than the critical SOC value.

Optionally, the vehicle may further include: a BSG controller 35; the BSG controller 35 is connected to the vehicle control unit 34, the power battery 32, and the BSG motor 31, respectively.

In practical applications, the BSG controller 35 may control the BSG motor 31 to perform related operations according to instructions of the vehicle controller 34. For example, the BSG controller 35 may control the BSG motor to start the engine 30 under the driving of the power battery 31, or control the BSG motor to charge the power battery 31 under the driving of the engine 30, according to the instructions of the vehicle controller 34.

Optionally, the power control system may further include: a distribution box 36; the distribution box 36 is connected to the power battery 31 and the BSG controller 35, respectively.

In practical applications, the distribution box 36 may be used as a hardware executing mechanism of the BSG controller 35, specifically, the distribution box 36 may integrate a switch device, a measuring instrument, a protection device, and an auxiliary device, and under the control of the BSG controller 35, the distribution box 36 may perform an operation of automatically switching on or off a circuit to start the engine 30 by the BSG motor driven by the power battery 31, or start the engine 30 by the BSG motor driven by the power battery 31.

In summary, the vehicle according to the embodiment of the present invention may include at least the following advantages:

in the embodiment of the invention, the vehicle control unit can obtain the ambient temperature and the real-time SOC value of the power battery; determining a critical SOC value corresponding to the environment temperature; and under the condition that the real-time SOC value is smaller than the critical SOC value, controlling a BSG motor to start an engine so as to provide power for the hybrid vehicle through the engine and charge the power battery, improving the SOC value and the discharge capacity of the power battery, avoiding the low-temperature breakdown fault of the hybrid vehicle, avoiding the over-discharge risk of the power battery and prolonging the service life of the power battery.

For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

Embodiments of the present invention also provide a computer-readable storage medium for a vehicle, where the computer-readable storage medium has instructions stored therein, and when the instructions are executed, the vehicle may perform the above-described power control method.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The power control method, the power control system, the hybrid vehicle and the storage medium provided by the invention are described in detail, and specific examples are applied to explain the principles and the embodiments of the invention, and the description of the embodiments is only used to help understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A power control method, characterized by comprising:

acquiring an ambient temperature and a power battery SOC value;

determining a critical SOC value corresponding to the environment temperature;

2. The control method according to claim 1, wherein the step of determining the threshold SOC value corresponding to the ambient temperature includes:

determining a temperature interval to which the environment temperature belongs, wherein the temperature interval is preset;

and determining a critical SOC value corresponding to the temperature interval, wherein the corresponding relation between the temperature interval and the critical SOC value is preset.

3. The control method according to claim 2, wherein the correspondence relationship between the temperature zone and the threshold SOC value is determined by,

determining a theoretical SOC value of the temperature interval;

and determining a critical SOC value corresponding to the temperature interval according to the theoretical SOC value.

4. The control method according to claim 3, wherein the step of determining the theoretical SOC value for the temperature interval comprises:

setting a plurality of SOC values;

testing the output power of the power battery under each SOC value at the lowest temperature of the temperature interval;

testing the required power required by the power battery to start the BSG motor under each SOC value under the lowest temperature of the temperature interval;

and determining the minimum SOC value corresponding to the condition that the required power of the power battery is less than or equal to the output power as the theoretical SOC value of the temperature interval.

5. The control method according to claim 1, characterized by, after the step of controlling the BSG motor to start the engine in the case where the power battery SOC value is smaller than the threshold SOC value, further comprising:

and under the condition that the SOC value of the power battery is greater than or equal to the critical SOC value, stopping controlling the BSG motor to start the engine.

6. A power control system for a vehicle, the vehicle comprising: an engine; the BSG motor is connected with the engine; the power battery is connected with the BSG motor; characterized in that the power control system comprises:

7. The control system of claim 6, wherein the vehicle control unit is further configured to stop controlling the BSG motor to start the engine if the power battery SOC value is greater than or equal to the threshold SOC value.

8. A vehicle, characterized by comprising: an engine; the BSG motor is connected with the engine; the power battery is connected with the BSG motor; and a power control system as claimed in any one of claims 6 to 7; wherein the content of the first and second substances,

9. The vehicle of claim 8, further comprising: a battery management module and a BSG controller; wherein the content of the first and second substances,

the battery management module is respectively connected with the power battery and the vehicle control unit;

the BSG controller is respectively connected with the vehicle control unit, the power battery and the BSG motor.

10. A computer readable storage medium for a vehicle having instructions stored therein, which when executed, the vehicle performs the power control method of any of claims 1 to 5.