Disclosure of Invention
According to the range extender, the control method and the device of the range extender, provided by the invention, the influence of the range extender on the vehicle sound vibration roughness is reduced.
The embodiment of the invention provides the following scheme:
In a first aspect, an embodiment of the present invention provides a control method for a range extender, including:
Acquiring the residual electric quantity and traction required power of a battery of a vehicle;
determining Cheng Gonglv of the output of the range extender according to the residual electric quantity of the battery and the traction required power;
And when the increase Cheng Gonglv is larger than the set power threshold, controlling the engine output torque of the range extender to correspondingly change along with the increase Cheng Gonglv.
In an alternative embodiment, said controlling the engine output torque of said range extender to follow a corresponding change in said increase Cheng Gonglv comprises:
When the residual electric quantity of the battery is smaller than a first electric quantity threshold value, determining the set torque of the engine according to a first corresponding relation between the range-increasing power and the preset value, wherein the first corresponding relation is a linear change relation between the output torque of the engine and the range-increasing Cheng Gonglv at the same rotating speed;
And controlling the range extender to output the Cheng Gonglv according to the set torque.
In an alternative embodiment, after controlling the range extender to output the range extender power according to the set torque, the method further includes:
when the residual electric quantity of the battery is smaller than a second electric quantity threshold value, controlling the range extender to output maximum power according to the maximum torque of the engine, wherein the second electric quantity threshold value is smaller than the first electric quantity threshold value;
And determining the residual power according to the difference between the maximum power and the increment Cheng Gonglv, and outputting the residual power to a power battery of the vehicle.
In an optional embodiment, after determining the range-extending power output by the range extender according to the remaining battery power and the traction required power, the method further includes:
Acquiring a second corresponding relation between the range-extending power and the engine control parameter;
When the range-increasing power is not greater than a set power threshold, determining a target control parameter of an engine according to the range-increasing power and the second corresponding relation, wherein the target control parameter is a control parameter of the minimum fuel quantity when the engine outputs the Cheng Gonglv;
And controlling the range extender to output the Cheng Gonglv according to the target control parameter.
In an optional embodiment, after controlling the range extender to output the range-extending power according to the target control parameter, the method further includes:
Updating the target control parameter when the range-extending power is changed;
and controlling the range extender to output variable increase Cheng Gonglv according to the updated target control parameter.
In an alternative embodiment, said controlling said range extender to output said range extender power according to said target control parameter includes:
Determining a target rotating speed and a target torque of the engine according to the target control parameters;
and controlling the range extender to output the Cheng Gonglv according to the target rotating speed and the target torque.
In a second aspect, an embodiment of the present invention further provides a range extender, where the range extender is controlled by the method according to any one of the first aspects.
In a third aspect, an embodiment of the present invention further provides a control device for a range extender, including:
the first acquisition module is used for acquiring the residual battery capacity and traction demand power of the vehicle;
The first determining module is used for determining Cheng Gonglv of the output of the range extender according to the residual electric quantity of the battery and the traction required power;
And the first control module is used for controlling the engine output torque of the range extender to correspondingly change along with the increment Cheng Gonglv when the increment Cheng Gonglv is larger than a set power threshold.
In a fourth aspect, embodiments of the present invention also provide an electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any of the first aspects.
In a fifth aspect, embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, implements the steps of the method according to any of the first aspects.
Compared with the prior art, the range extender and the control method and device of the range extender have the following advantages:
According to the control method, the battery residual capacity and the traction demand power of the vehicle are obtained, when the battery residual capacity cannot completely meet the traction demand power, the increase Cheng Gonglv of the output of the range extender is determined, when the increase Cheng Gonglv is larger than a set power threshold, the condition that the output of the range extender is required to be larger and the increase Cheng Gonglv meets the traction demand power is indicated, and the engine output torque of the range extender is controlled to correspondingly change along with the increase Cheng Gonglv. According to the method, the adverse effect of the range extender on the vehicle sound vibration roughness caused by noise brought by the too high rotating speed when the rotating speed of the engine is increased by Cheng Gonglv in a conventional mode is reduced, the output torque of the engine is controlled to correspondingly change along with the increase Cheng Gonglv, the range extender power can be ensured to meet the output requirement, and meanwhile, the influence of the noise of the range extender on the vehicle sound vibration roughness is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the embodiments of the present invention.
At present, a control strategy of the range extender mainly comprises a fixed-point strategy and a power following strategy of a multipoint working condition. Under the fixed point strategy, a plurality of different power matching points of the range extender are selected based on the power requirement of the common working condition of the whole vehicle so as to control the output of the range extender to increase Cheng Gonglv. Through fixed point operating mode output increase Cheng Gonglv, when surpassing whole car power demand, unnecessary electric quantity provides the battery charging, and the generated energy is when not enough, battery power generation makes up. The control strategy has the advantages that the switching frequency of the rotating speed point is low, high-frequency charging and discharging exist, repeated charging and discharging can be performed on a certain capacity storage point, and particularly the whole vehicle is in a high-speed working condition, and the power demand is high, so that the power is generated at a high-power fixed point for a long time, and the service life of the battery is greatly damaged. The power following strategy is based on the optimal efficiency point under different range-extending power, the matching point of the range extender changes along with the power demand of the vehicle, the corresponding matching point is selected based on the power demand of the whole vehicle, the generated energy of the range extender is similar to the power demand of the vehicle, the battery does not have frequent charge and discharge phenomena, meanwhile, the economical efficiency of the range extender is the optimal level, but the acoustic vibration roughness level in the power following mode is poor, the rotating speed of the range extender under the same power is high, and the range extender is unacceptable to users. Compared with the traditional vehicle, the weight of the hybrid vehicle type is increased, particularly the PHEV type, and the phenomenon of 'small horse-drawn large vehicle' is usually generated. Under the state of power deficiency, the range extender in the existing two modes has the problem of higher rotating speed, so that the influence on the sound vibration roughness is larger. How the above-described problems are solved by the control method of the embodiment of the present invention will be specifically described below.
Referring to fig. 1, fig. 1 is a flowchart of a control method of a range extender according to an embodiment of the present invention, including:
and S11, acquiring the residual battery capacity and the traction required power of the vehicle.
Specifically, the remaining battery power is the power capable of driving the vehicle in the vehicle power battery, and can be represented by the SOC (State of Charge) of the battery, or of course, by collecting the voltage of the vehicle power battery. The traction demand power is the power required to move the traction vehicle and can be calculated from the speed and acceleration of the vehicle. After the battery remaining power and the traction demand power are obtained, the process proceeds to step S12.
And S12, determining Cheng Gonglv of the range extender output according to the residual battery capacity and the traction required power.
Specifically, when the remaining battery power of the vehicle power battery is insufficient to provide the traction demand power, the remaining battery power is lower, and the range extender needs to be started to make up the insufficient demand power, so that the range extender is the difference between the traction demand power and the corresponding power of the remaining battery power. After determining the range-increasing power output by the range extender, the process proceeds to step S13.
And S13, when the increment Cheng Gonglv is larger than a set power threshold, controlling the engine output torque of the range extender to correspondingly change along with the increment Cheng Gonglv.
Specifically, when the increase Cheng Gonglv is greater than the set power threshold, it indicates that the range extender needs to output larger range extender power, if the conventional method for increasing the engine speed in the range extender is adopted, the sound vibration roughness of the vehicle may be adversely affected, so that the engine output torque of the range extender is controlled to correspondingly change along with the increase Cheng Gonglv. It can be understood that the range-extending power is the product of the engine speed and the output torque, when the demand of the range-extending power output is increased, the output torque of the engine is controlled to be correspondingly increased, and otherwise, when the demand of the range-extending power output is reduced, the output torque of the engine is controlled to be correspondingly reduced. On the premise of ensuring that the range extender can meet the range-extending power output requirement, the rotating speed of the engine is reduced as much as possible, so that the influence of the range extender on the vehicle sound vibration roughness is reduced. It can be understood by those skilled in the art that the power threshold can be set through experience of the skilled person, or can be determined through calibration experiments, and can meet the requirements of vehicle sound vibration roughness.
In a specific embodiment, controlling the engine output torque of the range extender to follow a corresponding change in the range extender Cheng Gonglv comprises:
When the residual electric quantity of the battery is smaller than a first electric quantity threshold value, determining the set torque of the engine according to a first corresponding relation between the range extender power and the preset value, wherein the first corresponding relation is a linear change relation between the output torque of the engine and the range extender Cheng Gonglv at the same rotating speed, and controlling the range extender to output Cheng Gonglv according to the set torque.
Specifically, the remaining battery power is less than the first power threshold, which indicates that the power required by the traction demand power may not be met by the vehicle power battery, and the range extender needs to be started to provide the output power meeting the traction demand power together with the power battery. Because the range-extending power is the product of the engine speed and the output torque, when the speed is unchanged, the increment Cheng Gonglv corresponds to the linear increment when the output torque is increased, so that the set torque of the engine can be determined according to the first corresponding relation between the range-extending power and the preset, the range extender output increment Cheng Gonglv is controlled according to the set torque, and the increment Cheng Gonglv meeting the requirement can be output when the speed is unchanged.
It should be noted that, under a fixed rotation speed, the range-increasing power corresponding to continuously increasing the output torque has an upper limit, so that the rotation speed of the engine can be correspondingly increased according to the increase of the range-increasing power, please refer to fig. 2, wherein the abscissa represents the rotation speed of the engine, the ordinate represents the output torque, and the curves in the figure respectively correspond to the percentage of the rated power of the range extender, specifically including 10% -70%. In the cloud image, the gray scale is characterized by the fuel economy of the engine from dark to light, and the lighter the gray scale is, the better the fuel economy is, and on the contrary, the darker the gray scale is, the worse the fuel economy is, so that the output torque and the rotating speed of the engine are required to be correspondingly operated in a light area as much as possible. The rotational speed may be defined as a plurality of fixed rotational speeds as needed, and the output torque may be increased at a corresponding fixed rotational speed according to the increase Cheng Gonglv to meet the output increase Cheng Gonglv as needed.
In practice, if the remaining battery power is too low, the vehicle power battery may be damaged due to serious power shortage.
In order to solve the above problem, in a specific embodiment, after controlling the range extender to output the range extender according to the set torque, the method further includes:
And when the residual electric quantity of the battery is smaller than a second electric quantity threshold value, controlling the range extender to output maximum power according to the maximum torque of the engine, wherein the second electric quantity threshold value is smaller than the first electric quantity threshold value, determining the residual power according to a difference value between the maximum power and the increase Cheng Gonglv, and outputting the residual power to a power battery of the vehicle.
Specifically, the remaining battery power is smaller than the second power threshold, which indicates that the power battery of the vehicle is in a serious power shortage state, in order to reduce the influence on the service life of the battery, the range extender is controlled to output maximum power according to the maximum torque of the engine, the remaining power is determined according to the difference value between the maximum power and the power which is Cheng Gonglv, the remaining power is redundant power of the range extender after the traction requirement power of the vehicle is met, the remaining power is output to the power battery of the vehicle, the power battery can be charged, and the influence of the serious power shortage of the power battery on the service life of the battery is reduced.
In the specific implementation, only by increasing the output torque to increase Cheng Gonglv, when the traction demand power is matched, the fuel consumption of the engine in the range extender is possibly large, and the running cost of the vehicle is increased.
In order to solve the above problem, in a specific embodiment, after determining the range-extending power output by the range extender according to the remaining battery power and the traction demand power, the method further includes:
The method comprises the steps of obtaining a second corresponding relation between the range-increasing power and engine control parameters, determining target control parameters of the engine according to the range-increasing Cheng Gonglv and the second corresponding relation when the range-increasing power is not larger than a set power threshold, wherein the target control parameters are control parameters of the minimum fuel quantity when the engine output increases Cheng Gonglv, and controlling the range extender to output Cheng Gonglv according to the target control parameters.
Specifically, the engine control parameters related to the fuel quantity include the engine speed, the intake air temperature, the intake air quantity, the output torque and the like, so as to achieve the same increase Cheng Gonglv, and the engine control parameters can be configured through different control parameters, and the different control parameters correspond to different fuel quantities. When the range-extending power is not greater than the set power threshold, the range-extending power required to be output by the range extender is smaller, the fuel economy of the engine is required to be considered, the target control parameters of the engine are determined according to the range-extending Cheng Gonglv and the second corresponding relation, so that the fuel consumption is reduced, the range extender is controlled to output Cheng Gonglv according to the target control parameters, and the range extender is enabled to output the range-extending power meeting the traction requirement power and simultaneously ensure the better fuel economy.
In a specific embodiment, after controlling the range extender to output the range extender power according to the target control parameter, the method further includes:
And controlling the range extender to output variable increase Cheng Gonglv according to the updated target control parameter.
Specifically, controlling the range extender to output the range extender power according to the target control parameter is a fixed-point control strategy, and the target control parameter is correspondingly updated when the range extender power changes, so that the range extender output meets the requirement of Cheng Gonglv.
In a specific embodiment, controlling the range extender to output range extender power according to the target control parameter includes:
And controlling the range extender to output Cheng Gonglv according to the target rotating speed and the target torque.
Specifically, referring to fig. 3, the manner of characterizing each parameter in the figure is the same as that of fig. 2, if the range-increasing power is not greater than the set power threshold, if the range-increasing power is Cheng Gonglv changed, in order to increase Cheng Gonglv the range-increasing output, the target control parameter needs to be updated correspondingly, for example, the current target control parameter is at control point 1, when the range-increasing power is increased and changed, the target control parameter is adjusted from the control point 1 to the rotation speed and torque corresponding to the control point 2 so as to output the increase Cheng Gonglv meeting the requirement, the rotation speed corresponding to the control point is lower, the influence on the sound vibration roughness of the vehicle is smaller, and the fuel economy can be better when the range-increasing power and the sound vibration roughness are met, so that it can be seen from the figure that the power threshold can be set to be 50% of the rated power of the range-increasing device.
The following embodiment of the present invention specifically describes how to implement the control method proposed by the present invention with reference to SOC when the vehicle is controlled with reference to fig. 4.
Firstly, a whole vehicle driving mode of a driver is identified, and whether the range extender is started or not is judged based on the electric quantity SOC of a whole vehicle battery.
And step two, judging that the range extender is matched with a working point based on the SOC, when the SOC is less than or equal to certain electric quantity A, indicating that the power battery cannot provide enough traction required power, starting the range extender, and entering a working point 1, namely a control point 1 in FIG. 3, wherein the engine rotating speed is lower under the working point, and the influence on the sound vibration roughness of the vehicle is smaller.
And step three, when the SOC is less than or equal to A-b, the working condition of the fixed point 2 is entered from the fixed point 1, namely the control point 2 in the figure 3, the engine speed is the medium speed under the working condition, and the range extender is at the optimal point of fuel economy.
And fourthly, when the SOC is less than or equal to A-b-c, the range-increasing power output by the range extender is further increased, the fixed-point mode enters the fixed-speed power to follow, the output torque of the engine is increased at a fixed speed, the engine is at a medium-high speed, and the sound vibration roughness is good.
And fifthly, when the SOC is less than or equal to A-b-c-d, indicating that the power battery of the vehicle is seriously deficient, enabling the range-extending power output by the range extender to reach the maximum, enabling the power at the speed of Cheng Qiding to be increased, enabling the power to follow, entering a maximum power point, and outputting the residual power to the power battery for storage.
And step six, judging to enter a fixed point/fixed rotating speed power following mode based on the electric quantity when the electric quantity of the SOC gradually increases.
And step seven, if the electric quantity SOC is more than or equal to A+e, closing the range extender, and entering an EV mode (or called a pure electric mode). Wherein A, b, c, d, e is a number >0, and its specific number may be determined by experience of a skilled person or by calibration test, and will not be described herein.
Based on the same inventive concept as the control method, the embodiment of the invention also provides a range extender, wherein the range extender is controlled by any one of the control methods.
Based on the same inventive concept as the control method, the embodiment of the invention further provides a control device of the range extender, referring to fig. 5, including:
a first obtaining module 501, configured to obtain a battery remaining power and a traction demand power of a vehicle;
the first determining module 502 is configured to determine, according to the remaining battery power and the traction required power, an increase Cheng Gonglv of the range extender output;
the first control module 503 is configured to control the engine output torque of the range extender to correspondingly change along with the increase Cheng Gonglv when the increase Cheng Gonglv is greater than a set power threshold.
In an alternative embodiment, the first control module includes:
The first determining submodule is used for determining the set torque of the engine according to a first corresponding relation between the range-increasing power and the preset value when the residual electric quantity of the battery is smaller than a first electric quantity threshold, wherein the first corresponding relation is a linear change relation between the output torque of the engine and the range-increasing Cheng Gonglv at the same rotating speed;
And the first control sub-module is used for controlling the range extender to output the Cheng Gonglv according to the set torque.
In an alternative embodiment, the first control module further includes:
The second control submodule is used for controlling the range extender to output maximum power according to the maximum torque of the engine when the residual electric quantity of the battery is smaller than a second electric quantity threshold value, wherein the second electric quantity threshold value is smaller than the first electric quantity threshold value;
And the output sub-module is used for determining the residual power according to the difference value between the maximum power and the increment Cheng Gonglv and outputting the residual power to a power battery of the vehicle.
In an alternative embodiment, the apparatus further comprises:
The second acquisition module is used for acquiring a second corresponding relation between the range-extending power and the engine control parameter;
The second determining module is configured to determine a target control parameter of an engine according to the range-extending power and the second corresponding relationship when the range-extending power is not greater than a set power threshold, where the target control parameter is a control parameter of a minimum fuel amount when the engine outputs the Cheng Gonglv;
and the second control module is used for controlling the range extender to output the Cheng Gonglv according to the target control parameter.
In an alternative embodiment, the apparatus further comprises:
The updating module is used for updating the target control parameters when the range-extending power changes;
and the third control module is used for controlling the increase Cheng Gonglv of the output change of the range extender according to the updated target control parameter.
In an alternative embodiment, the third control module includes:
The second determining submodule is used for determining the target rotating speed and the target torque of the engine according to the target control parameter;
and the third control sub-module is used for controlling the range extender to output the increase Cheng Gonglv according to the target rotating speed and the target torque.
Based on the same inventive concept as the control method, an embodiment of the invention further provides an electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions which, when executed by the processor, cause the electronic device to perform the steps of any one of the control methods.
Based on the same inventive concept as the control method, the embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any one of the control methods.
The technical scheme provided by the embodiment of the invention has at least the following technical effects or advantages:
1. Through obtaining the battery residual capacity and the traction demand power of the vehicle, when the battery residual capacity can not completely meet the traction demand power, determine the increase Cheng Gonglv of the output of the range extender, when the increase Cheng Gonglv is greater than a set power threshold, indicate that the output of the range extender is required to be larger and increase Cheng Gonglv to meet the traction demand power, and control the output torque of the engine of the range extender to correspondingly change along with the increase Cheng Gonglv. According to the method, the adverse effect of the range extender on the vehicle sound vibration roughness caused by noise brought by the too high rotating speed when the rotating speed of the engine is increased by Cheng Gonglv in a conventional mode is reduced, the output torque of the engine is controlled to correspondingly change along with the increase Cheng Gonglv, the range extender power can be ensured to meet the output requirement, and meanwhile, the influence of the noise of the range extender on the vehicle sound vibration roughness is reduced.
2. The control method of the invention takes the fuel economy of the whole vehicle into consideration based on the advantages of fixed point and fixed rotation speed power following, so that the vehicle still has better NVH performance when running at high speed.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, 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, 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.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, 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 apparatus 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 apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus 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 in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.