CN115123189A - Range extender, and control method and device of range extender - Google Patents
Range extender, and control method and device of range extender Download PDFInfo
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- CN115123189A CN115123189A CN202210699323.9A CN202210699323A CN115123189A CN 115123189 A CN115123189 A CN 115123189A CN 202210699323 A CN202210699323 A CN 202210699323A CN 115123189 A CN115123189 A CN 115123189A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/15—Control strategies specially adapted for achieving a particular effect
- B60W20/17—Control strategies specially adapted for achieving a particular effect for noise reduction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
- B60L50/62—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles charged by low-power generators primarily intended to support the batteries, e.g. range extenders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0666—Engine torque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Sustainable Energy (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a range extender, and a control method and a control device of the range extender. The method reduces the adverse effect of the range extender on the vehicle sound vibration roughness caused by the noise caused by overhigh rotating speed when the range extender is increased by increasing the rotating speed of the engine in the conventional mode, controls the output torque of the engine to correspondingly change along with the range extender, and can reduce the effect of the range extender noise on the vehicle sound vibration roughness while ensuring that the range extender reaches the output requirement.
Description
Technical Field
The application relates to the technical field of range extender control, in particular to a range extender, and a control method and a control device of the range extender.
Background
The hybrid power system is the vehicle type with the most market prospect at present, wherein the extended range power system is more favored, compared with the traditional vehicle, the fuel consumption and the emission of the whole vehicle are greatly reduced through the high-efficiency working point matching of an engine, and the national six/national seven emission regulations are achieved; compared with Hybrid Electric Vehicles (HEV) and Hybrid Electric vehicles (PHEV), the range extender reduces the problem of range anxiety to the maximum extent and achieves the range and pure Electric driving feeling of the traditional Vehicle.
In the hybrid architecture, the range extender is an electric vehicle component capable of providing additional electric energy, so that the electric vehicle can increase the driving distance, and the range extender refers to a combination of an engine and a generator. The range extender is only used for providing electric power, the engine does not participate in the direct drive of the vehicle mechanical mode, namely the range extender is completely decoupled from the transmission machinery of the whole vehicle, and the working point of the range extender is not directly related to the vehicle speed. At present, a fixed point strategy and a power following strategy are mostly adopted in a control strategy of a range extender, so that the evaluation of the Noise Vibration Harshness (NVH, Noise, Vibration and Harshness) of a vehicle is low.
Therefore, how to reduce the influence of the range extender on the roughness of the vehicle sound vibration is a technical problem to be solved urgently at present.
Disclosure of Invention
According to the range extender, the control method and the control device of the range extender, the influence of the range extender on the sound vibration roughness of the vehicle is reduced.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a method for controlling a range extender, including:
acquiring the residual battery capacity and the traction required power of a vehicle;
determining the range-extending power output by the range-extending device according to the residual battery capacity and the traction required power;
and when the range-extending power is larger than a set power threshold value, controlling the output torque of the engine of the range-extending device to correspondingly change along with the range-extending power.
In an alternative embodiment, the controlling the engine output torque of the range extender to follow the corresponding change of the range-extended power includes:
when the residual battery capacity is smaller than a first capacity threshold, determining a set torque of the engine according to a preset first corresponding relation between the range-extended power and the preset first corresponding relation, wherein the first corresponding relation is a linear change relation between the output torque and the range-extended power of the engine at the same rotating speed;
and controlling the range extender to output the range-extending power according to the set torque.
In an optional embodiment, after the controlling the range extender to output the range-extended power according to the set torque, the method further includes:
when the residual battery capacity is smaller than a second capacity threshold value, controlling the range extender to output the maximum power according to the maximum torque of the engine, wherein the second capacity threshold value is smaller than the first capacity threshold value;
and determining residual power according to the difference value between the maximum power and the range-extending power, and outputting the residual power to a power battery of the vehicle.
In an optional embodiment, after determining the range-extended power output by the range extender according to the battery residual capacity and the traction demand power, the method further includes:
acquiring a second corresponding relation between the range-extended power and an engine control parameter;
when the range-extending power is not larger than a set power threshold, determining a target control parameter of the engine according to the range-extending 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 range-extending power;
and controlling the range extender to output the range-extending power according to the target control parameter.
In an optional embodiment, after the controlling the range extender to output the range-extended power according to the target control parameter, the method further includes:
updating the target control parameter when the range-extended power changes;
and controlling the range extender to output the variable range extending power according to the updated target control parameter.
In an optional embodiment, the controlling the range extender to output the range-extended power according to the 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 range-extending power 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 described in 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 the traction required power of the vehicle;
the first determining module is used for determining the range-extending power output by the range-extending device according to the residual battery capacity and the traction required power;
the first control module is used for controlling the output torque of the engine of the range extender to correspondingly change along with the range extending power when the range extending power is larger than a set power threshold.
In a fourth aspect, embodiments of the present invention also provide an electronic device, including a processor and a memory, the memory being 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 one of the first aspects.
In a fifth aspect, the present invention also provides a computer-readable storage medium, on which a computer program is stored, where the computer program is used to implement the steps of any one of the methods in the first aspect when executed by a processor.
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 required power of the vehicle are obtained, when the battery residual capacity cannot completely meet the traction required power, the range extending power output by the range extender is determined, when the range extending power is larger than a set power threshold value, the range extender is required to output larger range extending power to meet the traction required power, and the engine output torque of the range extender is controlled to correspondingly change along with the range extending power. The method reduces the adverse effect of the range extender on the vehicle sound vibration roughness caused by the noise caused by overhigh rotating speed when the range extender is increased by increasing the rotating speed of the engine in the conventional mode, controls the output torque of the engine to correspondingly change along with the range extender, and can reduce the effect of the range extender noise on the vehicle sound vibration roughness while ensuring that the range extender reaches the output requirement.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a control method of a range extender according to an embodiment of the present invention;
FIG. 2 is a range-extending power cloud diagram of a constant-speed power following strategy according to an embodiment of the present invention;
fig. 3 is a range-extended power cloud diagram of a range extender optimization strategy provided in an embodiment of the present invention;
FIG. 4 is a logic diagram of a control strategy of the range extender according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control device of a range extender according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
At present, control strategies for a range extender mainly comprise a fixed point strategy and a power following strategy under multipoint working conditions. 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 range extender to output the range-extending power. The range-extending power is output under the fixed-point working condition, when the power demand of the whole vehicle is exceeded, redundant electric quantity is supplied to the battery for charging, and when the generated energy is insufficient, the battery generates electricity to make up. Due to the fact that the switching frequency of the rotating speed point is low, high-frequency charging and discharging exist, repeated charging and discharging can be conducted on a certain capacity storage point, particularly under the high-speed working condition of the whole vehicle, the required power is large, power generation is conducted at a high power fixed point for a long time, and damage to the service life of a battery is large. The power following strategy is based on the optimal efficiency points under different range-extending powers, the matching points of the range extender change along with the power requirement of the vehicle, the corresponding matching points are selected based on the power requirement of the whole vehicle, the generated energy of the range extender is close to the power requirement of the vehicle, and the battery does not have frequent charging and discharging phenomena; meanwhile, the economy of the range extender is the optimal level, but the sound 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 not acceptable to users. Compared with the traditional vehicle, the hybrid vehicle has increased weight, and particularly, the hybrid vehicle is a PHEV vehicle, and the phenomenon of 'small horse drawing large vehicle' usually occurs. Under insufficient voltage state, increase the journey ware under two kinds of modes now and all have the higher problem of rotational speed, cause to vibrate the roughness greatly to the sound. How to solve the above problems 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 power of the vehicle.
Specifically, the remaining battery power is the power that can drive the vehicle to drive in the vehicle power battery, and may be represented by the SOC (State of Charge) of the battery; of course, the voltage of the vehicle power battery can be collected for characterization. The power required by traction is the power required by the traction vehicle to move, and can be calculated through the speed and the acceleration of the vehicle. The remaining battery capacity and the traction demand power are acquired, and the process proceeds to step S12.
And S12, determining the range-extending power output by the range-extending device according to the battery residual capacity and the traction required power.
Specifically, when the remaining battery capacity of the vehicle power battery is not enough to provide the required traction power, it is indicated that the remaining battery capacity is low, and the range extender needs to be started to make up for the insufficient required power, so that the range extender is the difference between the required traction power and the power corresponding to the remaining battery capacity. The process proceeds to step S13 after determining the range-increasing power output from the range extender.
And S13, when the range-extending power is larger than a set power threshold value, controlling the engine output torque of the range extender to correspondingly change along with the range-extending power.
Specifically, when the range-extending power is greater than the set power threshold, it is indicated that the range-extending power which needs to be output by the range-extending device is relatively large, and if a conventional method for increasing the rotation speed of the engine in the range-extending device is adopted, the sound vibration roughness of the vehicle may be adversely affected, so that the output torque of the engine of the range-extending device is controlled to correspondingly change along with the range-extending power. The range-extended power is the product of the engine speed and the output torque, and when the requirement of the range-extended power output is increased, the output torque of the engine is controlled to be correspondingly increased; conversely, when the demand for range-extended power output is reduced, the output torque of the engine is controlled to be correspondingly reduced. On the premise of meeting the requirement of range-extending power output, the rotating speed of the engine is reduced as much as possible so as to reduce the influence of the range extender on the sound vibration roughness of the vehicle. Those skilled in the art will appreciate that the power threshold may be set through experience of the skilled person, or may be determined through calibration experiments, and may meet the requirement of the vehicle sound vibration roughness.
In one specific embodiment, controlling the output torque of the engine of the range extender to follow the corresponding change of the range power comprises:
when the remaining battery capacity is smaller than a first capacity threshold, determining the set torque of the engine according to a first corresponding relation between the range-extending power and a preset value, wherein the first corresponding relation is a linear change relation between the output torque of the engine and the range-extending power at the same rotating speed; and controlling the range extender to output range-extending power according to the set torque.
Specifically, the remaining battery capacity is smaller than the first capacity threshold, which indicates that the power battery of the vehicle may not meet the power required by the traction demand power, and the range extender needs to be started, and the power battery and the range extender together provide the output power meeting the traction demand power. Because the range-extending power is the product of the engine rotating speed and the output torque, when the rotating speed is not changed, the range-extending power is correspondingly and linearly increased when the output torque is increased, so that the set torque of the engine can be determined according to the range-extending power and the preset first corresponding relation, the range-extending power is controlled to be output by the range-extending device according to the set torque, and the range-extending power meeting the requirements can be output when the rotating speed is not changed.
It should be noted that, because the range-increasing power corresponding to the continuously increasing output torque has an upper limit at a fixed rotation speed, the rotation speed of the engine can be correspondingly increased according to the increase of the range-increasing power, please refer to fig. 2, in which the abscissa represents the rotation speed of the engine, and the ordinate represents the output torque, and the curves in the graph respectively correspond to the percentage of the rated power of the range extender, specifically including 10% to 70%. In the cloud picture, the gray scale is characterized by the depth to the lightness of the fuel economy of the engine, and the lighter the gray scale is, the better the fuel economy is; on the contrary, the darker the gradation, the worse the fuel economy, and therefore it is necessary to operate the output torque and the rotation speed of the engine corresponding to the light color region as much as possible. The rotating speed can be defined as a plurality of fixed rotating speeds according to the requirement, and the output torque is increased at the corresponding fixed rotating speed according to the range-extending power so as to meet the requirement of outputting the range-extending power.
In practical applications, if the remaining battery capacity is too low, the power battery of the vehicle may be damaged due to a serious power shortage.
In order to solve the above problem, in a specific embodiment, after controlling the range extender to output the range-extending 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 the 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 value of the maximum power and the range-extending power, and outputting the residual power to a power battery of the vehicle.
Specifically, the battery residual capacity is smaller than the second capacity threshold value, 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 the maximum power according to the maximum torque of the engine, the residual power is determined according to the difference value of the maximum power and the range extension power, the residual power is the redundant power of the range extender after the traction required power of the vehicle is met, the residual power is output to the power battery of the vehicle, the power battery can be charged, and the influence on the service life of the battery caused by serious power shortage of the power battery is reduced.
In specific implementation, the range-extending power is improved only by increasing the output torque, and when the traction required power is matched, the fuel consumption of an engine in a range extender is possibly large, and the running cost of a vehicle is increased.
In order to solve the above problem, in a specific embodiment, after determining the range-extending power output by the range-extending device according to the remaining battery capacity and the traction demand power, the method further includes:
acquiring a second corresponding relation between the range-extending power and the engine control parameter; when the range-extending power is not larger than the set power threshold, determining a target control parameter of the engine according to the range-extending 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 range-extending power; and controlling the range extender to output the range extending power according to the target control parameter.
Specifically, the engine control parameters related to the fuel quantity comprise engine speed, air inlet temperature, air inlet quantity, output torque and the like, the same range-extending power is achieved, configuration can be carried out 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, it is indicated that the range-extending power required to be output by the range-extending device is smaller, the fuel economy of the engine needs to be considered, the target control parameter of the engine is determined according to the range-extending power and the second corresponding relation so as to reduce the fuel consumption, the range-extending device is controlled to output the range-extending power according to the target control parameter, and the range-extending device can output the range-extending power meeting the traction required power and ensure better fuel economy.
In a specific embodiment, after controlling the range extender to output the range-extended power according to the target control parameter, the method further includes:
updating the target control parameter when the range-extending power changes; and controlling the range extender to output the variable range-extending power according to the updated target control parameter.
Specifically, controlling the range extender to output the range extending power according to the target control parameter is a fixed-point control strategy, and the target control parameter is updated correspondingly when the range extending power changes, so that the range extender outputs the range extending power meeting the requirement.
In a specific embodiment, the controlling the range extender to output the range-extended power according to the target control parameter comprises the following steps:
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 range-extending power according to the target rotating speed and the target torque.
Specifically, referring to fig. 3, the manner of representing each parameter in the graph is the same as that in fig. 2, when the range-extending power is not greater than the set power threshold, if the range-extending power changes, in order to enable the range extender to output the range-extending power, the target control parameter needs to be updated correspondingly, for example, the current target control parameter is at a control point 1, when the range-extending power increases and changes, the target control parameter is adjusted from the control point 1 to a rotating speed and a torque corresponding to the control point 2 to output the range-extending power meeting the requirement, the rotating speed corresponding to the control point is lower, the influence on the acoustic vibration roughness of the vehicle is smaller, better fuel economy can be achieved when the range-extending power and the acoustic vibration roughness are met, and it can be seen from the graph that the power threshold is set to be 50% of the rated power of the range extender.
In the following, the embodiment of the present invention specifically explains how to implement the control method provided by the present invention with reference to SOC during vehicle control with reference to fig. 4.
The method comprises the following steps: 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.
Step two: and judging the matching working condition point of the range extender based on the SOC, when the SOC is less than or equal to a certain electric quantity A, indicating that the power battery cannot provide enough traction required power, starting the range extender, and entering a fixed point 1 working condition, namely a control point 1 in the graph 3, wherein the rotating speed of the engine is lower under the working condition, and the influence on the sound vibration roughness of the vehicle is smaller.
Step three: when the SOC is less than or equal to A-b, the working condition of a fixed point 2, namely a control point 2 in the graph 3, is entered from the fixed point 1, the rotating speed of the engine is the middle rotating speed under the working condition, and the range extender is at the optimal point of fuel economy.
Step four: when the SOC is less than or equal to A-b-c, the range-extending power output by the range-extending device is further increased, the fixed-point mode enters the fixed-rotation-speed power to follow, the output torque of the engine is increased at a fixed rotation speed, the engine is at a medium-high rotation speed, and the sound vibration roughness is good.
Step five: when the SOC is less than or equal to A-b-c-d, the power shortage of the power battery of the vehicle is serious, the range-increasing power output by the range extender reaches the maximum, the range extender follows the constant rotating speed power, the maximum power point is reached, and the residual power is output to the power battery for storage.
Step six: and when the SOC electric quantity is gradually increased, judging to enter a fixed point/fixed rotation speed power following mode based on the electric quantity.
Step seven: if the SOC is larger than or equal to A + e, the range extender is closed, and the EV mode (or the pure electric drive mode) is entered. Wherein, the values of a, b, c, d and e are greater than 0, and the specific values can be determined by the experience of technicians or calibration tests, which are not described herein again.
Based on the same inventive concept as the control method, the embodiment of the invention also provides a range extender, and the range extender is controlled by any one of the control methods.
Based on the same inventive concept as the control method, an embodiment of the present invention further provides a control apparatus of a range extender, please refer to fig. 5, including:
a first obtaining module 501, configured to obtain a remaining battery capacity and a traction demand power of a vehicle;
a first determining module 502, configured to determine a range-extending power output by a range-extending device according to the battery remaining capacity and the traction demand power;
the first control module 503 is configured to control the engine output torque of the range extender to change correspondingly with the range-extended power when the range-extended power 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 preset first corresponding relation between the range-extended power and the preset first corresponding relation when the residual electric quantity of the battery is smaller than a first electric quantity threshold value, wherein the first corresponding relation is a linear change relation between the output torque and the range-extended power of the engine at the same rotating speed;
and the first control submodule is used for controlling the range extender to output the range-extending power according to the set torque.
In an optional embodiment, the first control module further includes:
the second control submodule is used for controlling the range extender to output the 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 submodule is used for determining the residual power according to the difference value between the maximum power and the range-extending power 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 determination module is used for determining a target control parameter of the engine according to the range-extending power and the second corresponding relation when the range-extending power is not larger than a set power threshold, wherein the target control parameter is a control parameter of the minimum fuel quantity when the range-extending power is output by the engine;
and the second control module is used for controlling the range extender to output the range extending power according to the target control parameter.
In an alternative embodiment, the apparatus further comprises:
the updating module is used for updating the target control parameter when the range-extending power changes;
and the third control module is used for controlling the range extender to output the variable range extending power according to the updated target control parameter.
In an alternative embodiment, the third control module includes:
the second determination submodule is used for determining the target rotating speed and the target torque of the engine according to the target control parameters;
and the third control submodule is used for controlling the range extender to output the range-extending power according to the target rotating speed and the target torque.
Based on the same inventive concept as the control method, an embodiment of the present invention also provides an electronic device, including a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, 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 embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, which, when executed by a processor, implements the steps of any one of the methods of the control method.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
1. the method comprises the steps that the battery residual capacity and the traction required power of a vehicle are obtained, when the battery residual capacity cannot completely meet the traction required power, the range-extending power output by a range extender is determined, when the range-extending power is larger than a set power threshold, the range-extending power which needs to be output by the range extender to be large meets the traction required power, and the engine output torque of the range extender is controlled to correspondingly change along with the range-extending power. The method reduces the adverse effect of the range extender on the vehicle sound vibration roughness caused by the noise caused by overhigh rotating speed when the range extender is increased by increasing the rotating speed of the engine in the conventional mode, controls the output torque of the engine to correspondingly change along with the range extender, and can reduce the effect of the range extender noise on the vehicle sound vibration roughness while ensuring that the range extender reaches the output requirement.
2. The control method of the invention is based on the power following advantages of fixed point and fixed rotating speed, and gives consideration to the fuel economy of the whole vehicle, so that the vehicle still has better NVH performance when running at high speed.
As will be appreciated by one skilled in the art, 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 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 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 the 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. 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 invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A control method of a range extender is characterized by comprising the following steps:
acquiring the residual battery capacity and the traction required power of the vehicle;
determining the range-extending power output by the range-extending device according to the residual battery capacity and the traction required power;
and when the range-extending power is larger than a set power threshold value, controlling the output torque of the engine of the range-extending device to correspondingly change along with the range-extending power.
2. The method of controlling a range extender of claim 1, wherein said controlling an engine output torque of the range extender to vary correspondingly with the range power comprises:
when the residual battery capacity is smaller than a first capacity threshold, determining a set torque of the engine according to the range-extended power and a preset first corresponding relation, wherein the first corresponding relation is a linear change relation of the output torque and the range-extended power of the engine at the same rotating speed;
and controlling the range extender to output the range-extending power according to the set torque.
3. The method of controlling the range extender of claim 2, further comprising, after controlling the range extender to output the range-extending power according to the set torque:
when the residual battery capacity is smaller than a second capacity threshold value, controlling the range extender to output the maximum power according to the maximum torque of the engine, wherein the second capacity threshold value is smaller than the first capacity threshold value;
and determining residual power according to the difference value between the maximum power and the range-extending power, and outputting the residual power to a power battery of the vehicle.
4. The method for controlling the range extender of claim 1, wherein after determining the range extender output range power according to the battery residual capacity and the traction demand power, the method further comprises:
acquiring a second corresponding relation between the range-extending power and an engine control parameter;
when the range-extending power is not larger than a set power threshold value, determining a target control parameter of the engine according to the range-extending 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 range-extending power;
and controlling the range extender to output the range-extending power according to the target control parameter.
5. The method for controlling the range extender of claim 4, wherein after controlling the range extender to output the range-extending power according to the target control parameter, the method further comprises:
updating the target control parameter when the range-extended power changes;
and controlling the range extender to output the variable range extending power according to the updated target control parameter.
6. The method of controlling the range extender of claim 4, wherein the controlling the range extender to output the range-extended power according to the target control parameter comprises:
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 range-extending power according to the target rotating speed and the target torque.
7. A range extender, wherein said range extender is controlled by a method according to any one of claims 1 to 6.
8. A control device for a range extender, comprising:
the first acquisition module is used for acquiring the residual battery capacity and the traction required power of the vehicle;
the first determining module is used for determining the range-extending power output by the range-extending device according to the residual battery capacity and the traction required power;
the first control module is used for controlling the output torque of the engine of the range extender to correspondingly change along with the range extending power when the range extending power is larger than a set power threshold.
9. 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 claims 1-6.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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| CN202210699323.9A CN115123189A (en) | 2022-06-20 | 2022-06-20 | Range extender, and control method and device of range extender |
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| CN202210699323.9A CN115123189A (en) | 2022-06-20 | 2022-06-20 | Range extender, and control method and device of range extender |
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| CN202210699323.9A Pending CN115123189A (en) | 2022-06-20 | 2022-06-20 | Range extender, and control method and device of range extender |
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