CN114109688B - Method and device for starting engine and vehicle - Google Patents
Method and device for starting engine and vehicle Download PDFInfo
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- CN114109688B CN114109688B CN202010889331.0A CN202010889331A CN114109688B CN 114109688 B CN114109688 B CN 114109688B CN 202010889331 A CN202010889331 A CN 202010889331A CN 114109688 B CN114109688 B CN 114109688B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0862—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a method and a device for starting an engine and a vehicle, wherein the method comprises the following steps: when the requirement for starting the engine is detected, judging whether the difference value between the maximum instantaneous discharge power of the power battery and the service power of the high-voltage equipment is greater than a first preset threshold value or not, and if the difference value is not greater than the first preset threshold value, limiting the service power of the electric accessory, wherein the first preset threshold value is not less than the maximum instantaneous power in the starting process of the engine; controlling the engine to start. When the engine is started, the consideration on the use power of the high-voltage equipment and the maximum instantaneous discharge power of the power battery is increased, the overcurrent problem can be avoided, and the service life of the power battery is prolonged.
Description
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a method and a device for starting an engine and a vehicle.
Background
When the engine is started, the power battery is needed to supply power for the motor, and the motor drives the engine to start. If the discharge power of the power battery is not enough, the motor can not successfully start the engine. If the power battery is over-discharged, the power battery can be damaged. Lower than hybrid vehicles, the industry currently only considers limiting the power used by the drive motor according to the maximum sustained discharge power of the power battery. The engine starting process does not take into account the discharge capacity of the power battery during the starting process because of the short duration. Especially, when the discharge power of the power battery is limited, the starting power may exceed the capability of the power battery, which may cause overcurrent of the power battery and too low voltage of one or more battery cells, thereby affecting the service life of the power battery.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In view of the defects in the prior art, an embodiment of the present invention provides a method for starting an engine, including:
when the requirement for starting the engine is detected, judging whether the difference value between the maximum instantaneous discharge power of the power battery and the service power of the high-voltage equipment is greater than a first preset threshold value or not, and if the difference value is not greater than the first preset threshold value, limiting the service power of the electric accessory, wherein the first preset threshold value is not less than the maximum instantaneous power in the starting process of the engine;
controlling the engine to start.
In one embodiment, the electrical accessory comprises an air conditioner and/or a DCDC converter and the high voltage device comprises the electrical accessory and a drive motor.
In one embodiment, the limiting the power used by the electrical accessory comprises:
turning off the air conditioner, and judging whether the working time of the DCDC converter exceeds a first preset time;
if the working time of the DCDC converter exceeds the first preset time, limiting the used power of the DCDC converter;
and if the working time of the DCDC converter does not exceed the first preset time, waiting for the DCDC converter to work.
In one embodiment, the limiting the power used by the DCDC converter comprises:
if the maximum instantaneous discharge power of the power battery is greater than the sum of the first preset threshold and the use power of the driving motor, limiting the use power of the DCDC converter to be not greater than the difference value between the maximum instantaneous discharge power of the power battery and the first preset threshold and the use power of the driving motor;
and if the maximum instantaneous discharge power of the power battery is not greater than the sum of the first preset threshold and the use power of the driving motor, controlling the DCDC converter to be turned off.
In one embodiment, the method further comprises:
and if the engine is started successfully, the engine drives a generator to charge the power battery, and the service power of the electric accessories is recovered.
In one embodiment, the restoring power usage of the electrical accessory comprises:
restoring the used power of the DCDC converter;
driving a generator to charge the power battery through the engine;
and recovering the service power of the air conditioner after the maximum continuous discharge power of the power battery is greater than a third preset threshold value, wherein the third preset threshold value is not less than the first preset threshold value.
In one embodiment, the method further comprises:
if the times of failed starting of the engine exceed a first preset time and the power of the power battery is detected to be recoverable, waiting for the power of the power battery to be recovered, and controlling the engine to start again when the maximum instantaneous discharge power of the power battery is larger than a fourth preset threshold, wherein the fourth preset threshold is not smaller than the first preset threshold.
In one embodiment, the method further comprises:
and if the number of times of failed engine starting exceeds a second preset number of times, ending the starting of the engine.
In one embodiment, the method further comprises:
and when the number of times of failed engine starting exceeds a first preset number of times, if the power of the power battery is detected to be unrecoverable, ending the starting of the engine.
In one embodiment, the electrical accessories comprise a first electrical accessory and/or a second electrical accessory, and before the determining whether the difference between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage equipment is greater than a first preset threshold, the method further comprises:
and judging whether the maximum continuous discharge power of the power battery is smaller than a second preset threshold value or not, and limiting the use power of a first electric accessory when the maximum continuous discharge power of the power battery is smaller than the second preset threshold value.
In one embodiment, the first electrical accessory comprises an air conditioner, and the limiting power usage of the first electrical accessory comprises:
limiting the use power of the air conditioner to be not more than the preset limit use power of the air conditioner when the power battery is limited and not more than the difference between the maximum continuous discharge power of the power battery and the use power of the DCDC converter and the use power of the driving motor.
In another aspect, an embodiment of the present invention provides an apparatus for starting an engine, including: a memory, a processor and a computer program stored on the memory and running on the processor, the processor when executing the computer program implementing the above-described method of starting an engine.
In still another aspect, a vehicle is provided that includes an apparatus for starting an engine as described above.
According to the method and the device for starting the engine and the vehicle, when the engine is started, the consideration on the use power of high-voltage equipment and the maximum instantaneous discharge power of the power battery is increased, the overcurrent problem can be avoided, and the service life of the power battery is prolonged.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail embodiments of the present invention with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings, like reference numbers generally represent like parts or steps.
FIG. 1 is a schematic flow chart diagram of a method of starting an engine according to one embodiment of the present disclosure;
FIG. 2 is a more detailed schematic flow chart diagram of a method of starting an engine according to one embodiment of the present disclosure;
fig. 3 is a schematic block diagram of an apparatus for starting an engine according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, exemplary embodiments according to the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the application described in the application without inventive step, shall fall within the scope of protection of the application.
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art, that the present application may be practiced without one or more of these specific details. In other instances, well-known features of the art have not been described in order to avoid obscuring the present application.
It is to be understood that the present application is capable of implementation in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present application, a detailed structure will be presented in the following description in order to explain the technical solutions presented in the present application. Alternative embodiments of the present application are described in detail below, however, the present application may have other implementations in addition to these detailed descriptions.
The following describes a method, an apparatus, and a vehicle for starting an engine according to an embodiment of the present invention with reference to the drawings. Referring initially to FIG. 1, FIG. 1 illustrates a schematic flow chart of a method 100 of starting an engine according to an embodiment of the present invention. As shown in FIG. 1, the method 100 of starting an engine includes:
in step S110, when a demand for starting the engine is detected, determining whether a difference between a maximum instantaneous discharge power of the power battery and a use power of the high-voltage device is greater than a first preset threshold, and if the difference is not greater than the first preset threshold, limiting the use power of the electrical accessory, wherein the first preset threshold is not less than the maximum instantaneous power in the engine starting process;
in step S120, the engine is controlled to start.
When the engine is started, the method 100 for starting the engine increases the consideration of the use power of the high-voltage equipment and the maximum instantaneous discharge power of the power battery, and limits the use power of the electric accessories if the difference value between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage equipment is not greater than a first preset threshold value, so that the total power in the starting process of the engine can be reduced, the overcurrent problem is avoided, and the service life of the power battery is prolonged; and the method can be realized by adding a set of logic judgment on the basis of the existing hardware structure and software program, thereby saving the cost.
Specifically, in step S110, it is determined whether the difference between the maximum instantaneous discharge power of the power battery and the usage power of the high-voltage device is greater than a first preset threshold P1, where the first preset threshold P1 is not less than the maximum instantaneous power during the engine start. If the difference between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage equipment is not greater than P1, that is, if the engine is started under the existing power utilization condition, the sum of the use power of the high-voltage equipment and the maximum instantaneous power of the engine during the starting process may exceed the maximum instantaneous discharge power of the power battery, so that the use power of the electric accessories needs to be limited to avoid influencing the service life of the power battery. On the contrary, if the difference between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage equipment is larger than P1, the sum of the maximum instantaneous discharge power in the starting process of the engine and the use power of the high-voltage equipment does not exceed the maximum instantaneous discharge power of the power battery, so that the engine can be directly controlled to start.
Illustratively, the high-voltage equipment includes the electric accessories including an air conditioner and a DCDC (high voltage direct current to low voltage direct current) converter, a driving motor, and the like. The power usage of the high voltage device comprises: the actual discharge power of the driving motor, the actual power of the air conditioner, the actual power of the DCDC and the like.
In step S110, the electrical accessories, the power usage of which is limited, include at least one of an air conditioner and a DCDC converter. As an example, only the power used by the air conditioner may be limited, and specifically, the air conditioner may be turned off to further reduce the power used by the electrical accessory. As another example, only the power of the DCDC converter may be limited. As another example, the limitation of the power used by both the air conditioner and the DCDC converter may specifically include:
firstly, the air conditioner is turned off, and whether the working time of the DCDC converter exceeds a first preset time T1 or not is judged. And if the working time of the DCDC converter exceeds the first preset time T1, limiting the used power of the DCDC converter. And if the working time of the DCDC converter does not exceed a first preset time T1, waiting for the DCDC converter to work. And counting the working time of the DCDC from the power-on cycle.
Specifically, the power battery supplies power to the storage battery through the DCDC converter, so that low-voltage power consumption of the whole vehicle is started through the storage battery, and therefore the first preset time period T1 at least can meet the low-voltage power consumption in the process of starting the engine for K1 times, namely the power consumption of low-voltage electric appliances of the whole vehicle within the time of starting the engine for K1 times. For example, when the engine is started once, the total power of the low-voltage electrical appliances is P5, the rated power of the DCDC converter is P6, and T1= P5 × T × K1/P6. The low-voltage devices include, but are not limited to, low-voltage modules such as meters in a Vehicle, VCUs (Vehicle control Unit), ISGs (Integrated Starter and Generator), BSGs (Belt-driven Starter Generator), BMS (Battery Management System), and ECUs (Engine Controller).
As described above, if the DCDC operation time exceeds T1, that is, the low-voltage electricity consumption has satisfied the low-voltage electricity consumption in K1 engine starting processes, the power consumption of the DCDC converter may be temporarily limited. Specifically, in one case, if the maximum instantaneous discharge power of the power battery is greater than the sum of the first preset threshold P1 and the used power of the drive motor, the used power of the DCDC converter is limited to be not greater than the difference between the maximum instantaneous discharge power of the power battery and the first preset threshold and the used power of the drive motor, even if the used power of the DCDC is less than or equal to the difference obtained by subtracting the used power of the drive motor from the maximum instantaneous discharge power of the power battery, that is, the sum of the maximum instantaneous power during the engine start, the used power of the drive motor, and the used power of the DCDC does not exceed the maximum instantaneous discharge power of the power battery, so as to avoid overcurrent of the power battery.
In another case, if the maximum instantaneous discharge power of the power battery is not greater than the sum of the first preset threshold P1 and the power used by the driving motor, the DCDC converter is controlled to be turned off so as to reduce the power used by the electrical accessories as much as possible.
In one embodiment, in step S110, when the requirement for starting the engine is detected, before determining whether the difference between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage device is greater than a first preset threshold P1, it is first determined whether the maximum sustained discharge power of the power battery is less than a second preset threshold P2, where the second preset threshold P2 is the maximum sustained discharge power threshold of the power battery that needs to limit the use power of the electrical accessory, and when the maximum sustained discharge power of the power battery is less than P2, the power battery may be considered to be limited, for example, the sustained discharge power of the power battery is limited due to extremely low temperature (e.g., -25 ℃ or lower), high temperature, electric leakage, or under-voltage of the battery core. At the moment, the use power of partial electric accessories can be limited firstly to reduce the probability of the failed starting of the engine; and then the judgment in step S110 is performed. On the contrary, if the maximum sustained discharge power of the power battery is greater than or equal to P2, the power battery may be considered to be unrestricted, and thus the engine start may be directly controlled at this time without limiting the power used by the electrical accessories. In other embodiments, the determination in step S110 may also be performed directly each time a need to start the engine is detected.
In one embodiment, the electrical accessory that limits its use power when the difference is not greater than the first preset threshold P1 in step S110 includes at least one of a first electrical accessory and a second electrical accessory, the electrical accessory that limits its use power when the maximum sustained discharge power of the power battery is less than a second preset threshold is the first electrical accessory, and the first electrical accessory is less important for starting the engine than the second electrical accessory. Wherein the first electrical accessory may include an air conditioner and the second electrical accessory may include a DCDC (high voltage direct current to low voltage direct current) converter. The first and second electrical accessories may also include other electrical accessories that require power from a power battery.
Next, step S120 is executed to control the engine start.
Wherein, if the engine is started successfully, the power usage of the limited electric accessories can be recovered. Illustratively, when the electrical accessories include an air conditioner and a DCDC converter, after the engine is successfully started, the power battery is charged by the engine-driven generator (e.g., BSG or ISG, etc.) and the power used by the DCDC converter is first restored. After the power battery is charged for a period of time, if the maximum continuous discharge power of the power battery is detected to be greater than the third preset threshold value P3, the power used by the air conditioner can be recovered. The third preset threshold P3 is not less than the second preset threshold P2.
And if the number of times of the engine starting failure exceeds a first preset number K1, detecting whether the power of the power battery can be recovered. When the power of the power battery is limited due to low temperature, high temperature and the like, self recovery can be achieved through measures such as heating, cooling and the like, and when the power of the power battery is limited due to electric leakage, sampling disconnection and the like, self recovery cannot be achieved. Therefore, if the power of the power battery is detected to be unrecoverable, the engine is stopped from being tried to be started, and the starting process is exited.
Otherwise, if the power of the power battery can be recovered, waiting for the power recovery of the power battery, and taking corresponding recovery measures for the power battery; and when the maximum instantaneous discharge power of the power battery is greater than a fourth preset threshold value P4, controlling the engine to start again, wherein the fourth preset threshold value P4 is not less than the first preset threshold value P1. Further, the fourth preset threshold P4 is not less than the sum of the maximum instantaneous power during the engine starting process and the power used by the high-voltage device, so as to avoid damage to the power battery due to overcurrent during the engine starting process. If the engine is started successfully, the subsequent steps are the same as those when the first attempt of starting the engine is successful, namely the used power of the DCDC converter can be recovered.
And if the number of times of the engine starting failure exceeds a second preset number of times K2, ending the starting of the engine and exiting the process. K2 is the maximum number of failures allowed for the second round of engine starting attempt, and K2 may be the same as or different from the maximum number of failures allowed for the first round of engine starting attempt K1.
Therefore, the method for starting the engine of the embodiment of the invention also increases the fault treatment when the engine fails to start, and can reduce the vehicle anchoring rate caused by the limitation of the power battery due to low temperature and the like.
In addition, when the power recovery of the power battery is waited for, if the operations such as gun insertion charging, vehicle power return and the like are detected, the attempt of starting the engine can be stopped, and the process can be exited. In addition, the time required by the power recovery of the battery can be estimated according to the heating or cooling power of the battery, and a second preset time period T2 is set according to the estimated time, and if the time for waiting for the power recovery of the power battery exceeds the second preset time period T2, it indicates that the power of the power battery may not be recovered, so that the waiting can be stopped, and the starting process is exited.
Referring to fig. 2, a more detailed flow chart of a method of starting a motor according to an embodiment of the present invention is shown. In the example of fig. 2, the first electrical accessory is an air conditioner and the second electrical accessory is a DCDC converter.
As shown in fig. 2, first, it is determined whether a need to start the engine is detected. If the requirement for starting the engine is detected, whether the maximum continuous discharge power of the power battery is smaller than a second preset threshold value P2 or not is judged. And if the maximum continuous discharge power of the power battery is less than P2, limiting the use power of the air conditioner, for example, limiting the use power of the air conditioner to be not higher than the preset limit use power of the air conditioner when the power battery is limited, and not higher than the maximum continuous discharge power of the power battery, the use power of the DCDC converter and the use power of the driving motor. And if the maximum continuous discharge power of the power battery is greater than or equal to P2, directly controlling the engine to start.
And then, judging whether the difference value between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage equipment is smaller than a first preset threshold value P1. And if the difference value between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage equipment is greater than or equal to P1, directly controlling the engine to start. If the difference value between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage equipment is smaller than P1, the air conditioner is turned off, and whether the working time of the DCDC converter exceeds a first preset time T1 or not is judged. And if the working time of the DCDC converter does not exceed T1, waiting for the operation of the DCDC converter. And if the working time of the DCDC converter exceeds T1, limiting the used power of the DCDC converter. Then, the engine start is controlled.
After the engine is controlled to be started, whether the engine is started successfully can be judged.
If the engine is started successfully, the generator can be driven by the engine to charge the power battery, and the use power of the DCDC converter is recovered. And after the power battery is charged for a period of time, if the maximum continuous discharge power of the power battery is greater than a third preset threshold value P3, the use of the air conditioner is resumed.
And if the engine cannot be started successfully after the engine is started for K1 times, judging whether the power of the power battery can be recovered. And if the power of the power battery is not recovered, directly exiting the starting process. And if the fact that the power of the power battery can be recovered is detected, waiting for the power recovery of the power battery, re-trying to start the engine when the maximum instantaneous discharge power of the power battery is larger than a fourth preset threshold value P4, and if the engine is started successfully, recovering the use power of the DCDC converter. And if the engine cannot be started successfully after the engine is started for K2 times, exiting the starting process.
According to the method for starting the engine, when the engine is started under the condition that the power battery is limited, the consideration on the power of the electric accessory is increased, the consideration on the maximum instantaneous discharge power of the power battery is increased, the overcurrent problem can be avoided, and the service life of the power battery is prolonged.
Referring to fig. 3, fig. 3 is a schematic block diagram illustrating an apparatus for starting an engine according to an embodiment of the present invention. As shown in fig. 3, the engine starting apparatus 300 includes a memory 310, a processor 320, and a computer program stored in the memory 310 and running on the processor 320, and the processor 320 executes the computer program to implement the engine starting method as described above. The Device may be implemented as a vehicle control Unit, the Processor 320 may be implemented by software, hardware, firmware or a combination thereof, and may use at least one of a Circuit, a single or multiple Application Specific Integrated Circuits (ASICs), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor, so that the Device may perform a part of or all of the steps of the method for starting the engine in the embodiments of the present Application, or any combination of the steps.
Embodiments of the present invention also provide a vehicle, which may be implemented as a hybrid vehicle, including at least an apparatus 300 for starting an engine as shown in fig. 3. Besides, the vehicle may include some or all of an engine, a power battery, a drive motor, and electrical accessories such as an air conditioner, a DCDC converter, and the like.
In conclusion, when the method, the device and the vehicle for starting the engine provided by the embodiment of the invention start the engine, the consideration on the use power of the high-voltage equipment and the maximum instantaneous discharge power of the power battery is increased, the overcurrent problem can be avoided, and the service life of the power battery is prolonged.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the foregoing illustrative embodiments are merely exemplary and are not intended to limit the scope of the invention thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as set forth in the appended claims.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the method of the present invention should not be construed to reflect the intent: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The above description is only for the specific embodiment of the present invention or the description thereof, and the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
1. A method of starting an engine, the method comprising:
when the requirement for starting the engine is detected, judging whether the difference value between the maximum instantaneous discharge power of the power battery and the service power of the high-voltage equipment is greater than a first preset threshold value or not, and if the difference value is not greater than the first preset threshold value, limiting the service power of the electric accessory, wherein the first preset threshold value is not less than the maximum instantaneous power in the starting process of the engine;
controlling the engine to start;
wherein the electrical accessory comprises an air conditioner and/or a DCDC converter, the high voltage device comprises the electrical accessory and a driving motor, and the limiting of the power used by the electrical accessory comprises:
turning off the air conditioner, and judging whether the working time of the DCDC converter exceeds a first preset time;
if the working time of the DCDC converter exceeds the first preset time, limiting the used power of the DCDC converter;
and if the working time of the DCDC converter does not exceed the first preset time, waiting for the DCDC converter to work.
2. The method of claim 1, wherein limiting the power used by the DCDC converter comprises:
if the maximum instantaneous discharge power of the power battery is greater than the sum of the first preset threshold and the use power of the driving motor, limiting the use power of the DCDC converter to be not greater than the difference value between the maximum instantaneous discharge power of the power battery and the first preset threshold and the use power of the driving motor;
and if the maximum instantaneous discharge power of the power battery is not greater than the sum of the first preset threshold and the use power of the driving motor, controlling the DCDC converter to be turned off.
3. The method of claim 1, further comprising:
and if the engine is started successfully, the engine drives a generator to charge the power battery, and the service power of the electric accessories is recovered.
4. The method of claim 3, wherein the restoring power usage of the electrical accessory comprises:
restoring the used power of the DCDC converter;
driving a generator to charge the power battery through the engine;
and after the maximum continuous discharge power of the power battery is larger than a third preset threshold value, recovering the service power of the air conditioner.
5. The method of claim 1, further comprising:
if the number of times of failed engine starting exceeds a first preset number of times and the power of the power battery is detected to be recoverable, waiting for the power of the power battery to be recovered, and controlling the engine to start again when the maximum instantaneous discharge power of the power battery is greater than a fourth preset threshold which is not less than the first preset threshold.
6. The method of claim 5, further comprising:
and if the number of times of the engine starting failure exceeds a second preset number of times, ending the starting of the engine.
7. The method of claim 5, further comprising:
and when the number of times of failed engine starting exceeds a first preset number of times, if the power of the power battery is detected to be unrecoverable, ending the starting of the engine.
8. The method according to claim 1, wherein before the determining whether the difference between the maximum instantaneous discharge power of the power battery and the use power of the high-voltage equipment is greater than a first preset threshold, the method further comprises:
and judging whether the maximum continuous discharge power of the power battery is smaller than a second preset threshold value or not, and limiting the use power of the air conditioner when the maximum continuous discharge power of the power battery is smaller than the second preset threshold value.
9. The method of claim 8, wherein the limiting the power usage of the air conditioner comprises:
limiting the use power of the air conditioner to be not more than the preset limit use power of the air conditioner when the power battery is limited and not more than the difference between the maximum continuous discharge power of the power battery and the use power of the DCDC converter and the use power of the driving motor.
10. An apparatus for starting an engine, comprising:
memory, a processor and a computer program stored on the memory and running on the processor, the processor when executing the computer program implementing a method of starting an engine according to any one of claims 1 to 9.
11. A vehicle characterized by comprising the apparatus for starting an engine according to claim 10.
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| JP2016078533A (en) * | 2014-10-14 | 2016-05-16 | 三菱電機株式会社 | Engine starter |
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| CN110341479A (en) * | 2018-04-08 | 2019-10-18 | 上海汽车集团股份有限公司 | The control method and control device of electric car |
| CN110654369A (en) * | 2018-06-29 | 2020-01-07 | 比亚迪股份有限公司 | Hybrid vehicle engine starting control method and device and computer equipment |
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| JP2016078533A (en) * | 2014-10-14 | 2016-05-16 | 三菱電機株式会社 | Engine starter |
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