CN111723487B - Optimization method, device, equipment and storage medium for working condition point of range extender - Google Patents

Optimization method, device, equipment and storage medium for working condition point of range extender Download PDF

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CN111723487B
CN111723487B CN202010574801.4A CN202010574801A CN111723487B CN 111723487 B CN111723487 B CN 111723487B CN 202010574801 A CN202010574801 A CN 202010574801A CN 111723487 B CN111723487 B CN 111723487B
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rotating speed
power consumption
power
point
operating point
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CN111723487A (en
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王杭燕
周水庭
欧阳联格
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Shanghai Aiqu Auto Technology Co ltd
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Xiamen University of Technology
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/06—Power analysis or power optimisation
    • 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
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The embodiment of the invention provides an optimization method, device, equipment and medium for working condition points of a range extender, and relates to the technical field of new energy automobiles. The optimization method for the working condition point of the range extender comprises the following steps: acquiring the required power of the range extender; obtaining a first working point and a rotating speed interval of the engine according to the required power; acquiring first power consumption; updating the rotating speed within the rotating speed interval by taking the first rotating speed as a starting point and a preset rotating speed step length to obtain working points and power consumption under different rotating speeds; when the working point with the power consumption smaller than the first power consumption exists, the working points with the power consumption lower than the first power consumption and the rotating speed close to the first rotating speed are respectively obtained at two sides of the first rotating speed, and the working point with the low power consumption is set as a target working point of the required power; otherwise, the first operating point is taken as the target operating point of the required power. The embodiment can accurately acquire the optimal working condition point of the range extender, can ensure that the oil consumption is the lowest while the required power is achieved, and greatly saves energy.

Description

Optimization method, device, equipment and storage medium for working condition point of range extender
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a method, a device, equipment and a storage medium for optimizing working condition points of a range extender.
Background
The range extender is a combination of a generator and an engine, and is a device and an auxiliary device for supplying electric power to the electric automobile. When the electric automobile is in the range extending mode, the engine drives the generator to operate so as to provide electric energy for the motor or the battery of the automobile. When the battery capacity of the electric automobile is sufficient, the range extender does not operate, the electric automobile is in a pure electric mode, when the battery capacity is insufficient and the electric automobile needs to travel for a long distance, the range extender is turned on to assist in driving the whole automobile to operate, and the electric automobile enters the range extender mode to achieve a longer travel distance.
The range extender mainly comprises an engine system and a generator system, and is provided with a control system consisting of an Engine Control Unit (ECU), a Generator Control Unit (GCU) and a range extender control unit (PFCU). In order to protect the storage battery to the maximum extent, it is necessary to ensure that the power generation power of the range extender is relatively stable, and at the same time, in order to save the oil consumption of the engine, the engine is required to operate in an efficient working range. And an optimal working condition point with the lowest oil consumption of the engine exists in each working interval, and a technical means for searching the optimal working condition point is lacked in the related technology.
Disclosure of Invention
The invention provides an optimization method, device, equipment and storage medium for working condition points of a range extender, which aim to solve the problem that the optimal working condition point of the range extender in any power interval is lacked to be searched in the related technology.
In a first aspect, an embodiment of the present invention provides an optimization method for a range extender operating point, including:
acquiring the required power of the range extender;
obtaining a first working point and a rotating speed interval of the engine according to the required power; wherein the first operating point comprises a first rotational speed corresponding to the required power;
acquiring first power consumption; wherein the first power consumption is an average power consumption of the engine operating at the first operating point for a certain time;
updating the rotating speed in the rotating speed interval by taking the first rotating speed as a starting point and a preset rotating speed step length to obtain working points and power consumption under different rotating speeds;
when the operating point with the power consumption smaller than the first power consumption exists, the operating points with the power consumption lower than the first power consumption and the rotating speed closest to the first rotating speed are respectively obtained at two sides of the first rotating speed, and the operating point with the lower power consumption is set as a target operating point of the required power; otherwise, taking the first operating point as the target operating point of the required power; two sides of the first rotating speed are the directions from the first rotating speed to two end points of the rotating speed interval.
Further, with the first rotating speed as a starting point, updating the rotating speed in the rotating speed interval by using a preset rotating speed step length to obtain working points and power consumption under different rotating speeds, and
when the operating point with the power consumption smaller than the first power consumption exists, the operating points with the power consumption lower than the first power consumption and the rotating speed closest to the first rotating speed are respectively obtained at two sides of the first rotating speed, and the operating point with the lower power consumption is set as a target operating point of the required power; otherwise, taking the first operating point as the target operating point of the required power; two sides of the first rotating speed are directions from the first rotating speed to two end points of the rotating speed interval; the method specifically comprises the following steps:
updating the rotating speed along a first direction by taking the first rotating speed as a starting point and a set rotating speed step length, and calculating a second working point and a second power consumption corresponding to the updated rotating speed until the second power consumption is less than or equal to the first power consumption or the updated rotating speed exceeds the rotating speed interval;
when judging that second power consumption smaller than the first power consumption exists, recording the second power consumption as intermediate power consumption, and recording a second working point as an intermediate working point; otherwise, recording the first power consumption as an intermediate power consumption, and recording the first working point as an intermediate working point;
updating the rotating speed along a second direction by taking the first rotating speed as a starting point and the rotating speed step length, and calculating a third working point and a third power consumption corresponding to the updated rotating speed until the third power consumption is less than or equal to the intermediate power consumption or the updated rotating speed exceeds the rotating speed interval; wherein the second direction has a different direction of numerical change than the first direction;
when judging that third power consumption smaller than the intermediate power consumption exists, taking a third working point corresponding to the third power consumption as the target working point of the required power; otherwise, taking an intermediate operating point corresponding to the intermediate power consumption as the target operating point of the required power.
Further, according to the required power, a first working point and a rotating speed interval of the engine are obtained; the method specifically comprises the following steps:
according to the required power P, the corresponding first working point and the corresponding rotating speed interval (N) are obtained from the universal characteristic curve of the range extendermin,Nmax) (ii) a Wherein the first operating point comprises a first rotational speed N1And a first torque T1The expression of the first torque is：T1＝P×9550÷N1。
Further, the optimization method of the working condition point of the range extender comprises the following steps:
obtaining a power interval [ P ] of the range extendermin,Pmax]Setting the minimum power or the maximum power of the power interval as the required power; to obtain a target operating point for the minimum power or the maximum power.
Further, the optimization method of the working condition point of the range extender comprises the following steps:
updating the required power according to a preset power step length by taking the required power as a starting point until the updated required power exceeds the power interval; to obtain target operating points for a plurality of different powers of the power interval.
In a second aspect, an embodiment of the present invention provides an optimizing device for a working point of a range extender, including:
a power acquisition module: the power demand of the range extender is obtained;
an initial parameter acquisition module: the method comprises the steps that a first working point and a rotating speed interval of an engine are obtained according to the required power; wherein the first operating point comprises a first rotational speed corresponding to the required power;
an initial power consumption acquisition module: the first power consumption is acquired; wherein the first power consumption is an average power consumption of the engine operating at the first operating point for a certain time;
a rotating speed updating module: the control circuit is used for updating the rotating speed in the rotating speed interval by taking the first rotating speed as a starting point and a preset rotating speed step length to obtain working points and power consumption under different rotating speeds;
a target operating point acquisition module: when the operating point with the power consumption smaller than the first power consumption exists, the operating points with the power consumption lower than the first power consumption and the rotating speed closest to the first rotating speed are respectively obtained at two sides of the first rotating speed, and the operating point with the lower power consumption is set as a target operating point of the required power; otherwise, taking the first operating point as the target operating point of the required power; two sides of the first rotating speed are the directions from the first rotating speed to two end points of the rotating speed interval.
Further, the rotating speed updating module comprises a first rotating speed updating unit and a second rotating speed updating unit, and the target working point obtaining module comprises an intermediate working point obtaining unit and a target working point obtaining unit;
the first rotating speed updating unit is used for updating the rotating speed along a first direction by taking the first rotating speed as a starting point and a set rotating speed step length, and calculating a second working point and second power consumption corresponding to the updated rotating speed until the second power consumption is less than or equal to the first power consumption or the updated rotating speed exceeds the rotating speed interval;
an intermediate operating point obtaining unit, configured to, when it is determined that there is a second power consumption smaller than the first power consumption, note that the second power consumption is an intermediate power consumption, and the second operating point is an intermediate operating point; otherwise, recording the first power consumption as an intermediate power consumption, and recording the first working point as an intermediate working point;
the second rotating speed updating unit is used for updating the rotating speed along a second direction by taking the first rotating speed as a starting point and the rotating speed step length, and calculating a third working point and a third power consumption corresponding to the updated rotating speed until the third power consumption is less than or equal to the intermediate power consumption or the updated rotating speed exceeds the rotating speed interval; wherein the second direction has a different direction of numerical change than the first direction;
a target operating point obtaining unit, configured to, when it is determined that a third power consumption smaller than the intermediate power consumption exists, take a third operating point corresponding to the third power consumption as the target operating point of the required power; otherwise, taking an intermediate operating point corresponding to the intermediate power consumption as the target operating point of the required power.
Further, an optimizing device for the working condition point of the range extender comprises:
a power interval acquisition module: for obtaining a power interval [ P ] of the range extendermin,Pmax]Setting the minimum power or the maximum power of the power interval as the required power; to obtain a target operating point for the minimum power or the maximum power;
further, an optimizing device for the working condition point of the range extender comprises:
a power update module: the power supply unit is used for updating the required power according to a preset power step length by taking the required power as a starting point until the updated required power exceeds the power interval; obtaining a plurality of target operating points with different powers in the power interval; and
further, the initial parameter obtaining module: the method is specifically used for:
according to the required power P, the corresponding first working point and the corresponding rotating speed interval (N) are obtained from the universal characteristic curve of the range extendermin,Nmax) (ii) a Wherein the first operating point comprises a first rotational speed N1And a first torque T1The expression of the first torque is: t is1＝P×9550÷N1。
In a third aspect, the present invention provides an apparatus for optimizing a range extender operating point, comprising a processor, a memory, and a computer program stored in the memory, the computer program being executable by the processor to implement a method for optimizing a range extender operating point as described in any of the above paragraphs.
In a fourth aspect, the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where the computer program, when running, controls an apparatus in which the computer-readable storage medium is located to execute a method for optimizing a range extender operating point as described in any one of the above paragraphs.
The embodiment of the invention provides an optimization method, a device, equipment and a medium for working condition points of a range extender, which can achieve the following technical effects:
the average oil consumption of the range extender at different rotating speeds under the required power is obtained by adjusting the rotating speed in the rotating speed interval corresponding to the required power of the range extender. And respectively acquiring working points with power consumption lower than the first power consumption and with rotating speeds close to the first rotating speed at two sides of the first rotating speed, and taking the working points with lower power consumption as target working points corresponding to the required power. And when no power consumption is lower than the first power consumption in the rotating speed interval, using the first power consumption as a target working point. The target operating point is the optimal operating point of the range extender at the power.
The embodiment of the invention can accurately acquire the optimal working condition point of the range extender, can ensure that the oil consumption is the lowest while the required power is achieved, greatly saves energy and has good practical significance.
In this embodiment, a first operating point is obtained from the universal characteristic curve of the range extender according to the required power, and the first operating point is used as a starting point. When the power consumption is lower than the first power consumption working point in the power interval, the engine does not need to traverse the whole rotating speed interval in the optimizing process. The work load of the optimizing equipment and the range extender is reduced, the optimizing speed is greatly improved, and the method has good practical significance.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a connection relationship between a range extender and an external device.
Fig. 2 is a flowchart of an optimization method for operating points of a range extender according to a first embodiment of the present invention.
Fig. 3 is a logic structure block diagram of an optimization method for operating points of a range extender according to another embodiment of the present invention.
Fig. 4 is a block diagram of an optimizing device for a range extender operating point according to a second embodiment of the present invention.
Reference numbers in the figures: 1-a range extender; 401-a power acquisition module; 402-an initial parameter acquisition module; 403-rotating speed updating module; 404-target operating point acquisition module.
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 obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
In the embodiments, the references to "first \ second" are merely to distinguish similar objects and do not represent a specific ordering for the objects, and it is to be understood that "first \ second" may be interchanged with a specific order or sequence, where permitted. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced in sequences other than those illustrated or described herein.
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
as shown in fig. 1, the range extender 1 is a combination of a generator and an engine, and is a device for supplying electric power to an electric vehicle, and an auxiliary device.
The first embodiment is as follows:
referring to fig. 2, a first embodiment of the present invention provides an optimization method for a range extender operating point, which can be executed by an optimization device (hereinafter referred to as an optimization device) of the range extender operating point, and in particular, executed by at least one processor in the optimization device, so as to implement at least the following steps:
and S101, acquiring the required power of the range extender.
In this embodiment, the optimizing device may be a range extender controller, which may control the rotation speed/torque of the engine, and ensure that the power of the range extender is stabilized at the required power, so as to ensure the stability of the power of the whole vehicle.
In this embodiment, the optimizing device may obtain the required power of the range extender according to an external condition or an input of a user.
S102, obtaining a first working point and a rotating speed interval of the engine according to the required power; wherein the first operating point comprises a first rotational speed corresponding to the required power.
Specifically, according to the required power P, a first working point and a rotating speed interval (N) corresponding to the engine are obtained from a universal characteristic curve of the range extendermin,Nmax) (ii) a Wherein the first operating point comprises a first rotation speed N1And a firstA torque T1The expression for the first torque is:
T1＝P×9550÷N1。
s103, acquiring first power consumption; the first power consumption is the average power consumption of the engine working at the first working point for a certain time.
In this embodiment, the first power consumption F is the operation t of the engine at the first operating point1Average fuel consumption over time. Wherein, t1For a preset time period, the fuel consumption is the amount of fuel consumed by the range extender every time 1kWh of electricity is generated.
And S104, updating the rotating speed in the rotating speed interval by taking the first rotating speed as a starting point and a preset rotating speed step length, and obtaining working points and power consumption under different rotating speeds.
In this embodiment, the first operating point is obtained from the universal characteristic curve of the range extender according to the required power. And taking the first working point as a starting point, and when the working point with the power consumption lower than the first power consumption exists in the rotating speed interval, the optimizing equipment does not need to traverse the whole rotating speed interval in the optimizing process. The work load of the optimizing equipment and the range extender is reduced, the optimizing speed is greatly improved, and the method has good practical significance.
The working point comprises an updated rotating speed N and an updated torque T, and the expression of the torque is as follows:
T＝P×9550÷N
wherein, P is the required power.
The power consumption F is the engine working t at the updated rotating speed N1Average fuel consumption over time.
S105, when the working point with the power consumption smaller than the first power consumption exists, respectively obtaining the working points with the power consumption lower than the first power consumption and the rotating speed closest to the first rotating speed at two sides of the first rotating speed, and setting the working point with the lower power consumption as a target working point of the required power; otherwise, taking the first operating point as a target operating point of the required power; wherein, two sides of the first rotating speed are the directions from the first rotating speed to two end points of the rotating speed interval.
In this embodiment, the average oil consumption of the range extender at different rotating speeds under the required power is obtained by adjusting the rotating speed in the rotating speed interval corresponding to the required power of the range extender. And respectively acquiring working points with power consumption lower than the first power consumption and with rotating speeds close to the first rotating speed at two sides of the first rotating speed, and taking the working points with lower power consumption as target working points corresponding to the required power. And when the power consumption does not exist in the rotating speed interval and is lower than the first power consumption, using the first power consumption as a target working point. The target operating point is the optimal operating point of the range extender at the power. The optimal working condition point of the range extender can be accurately obtained, the optimal working condition point can be guaranteed to be located while the required power is achieved, the oil consumption is the lowest, the energy is greatly saved, and the method has good practical significance.
In this embodiment, S104 and S105 specifically include the following steps:
and S1, updating the rotating speed along the first direction by using the first rotating speed as a starting point and using the set rotating speed step length, and calculating a second working point and a second power consumption corresponding to the updated rotating speed until the second power consumption is less than or equal to the first power consumption or the updated rotating speed exceeds the rotating speed interval.
Specifically, the method comprises the following steps:
the rotating speed step length is a preset rotating speed change step length value. The first direction is a direction of increasing the rotation speed.
In this embodiment, the first rotation speed is used as a starting point, the rotation speed is continuously increased by using the rotation speed step as a variation value, and a second working point and a second power consumption corresponding to the rotation speed after each increase are obtained until the second working point with the second power consumption not greater than the first power consumption appears in the rotation speed interval, or the rotation speed exceeds the rotation speed interval.
S2, when judging that the second power consumption smaller than the first power consumption exists, recording the second power consumption as the intermediate power consumption, and recording the second working point as the intermediate working point; otherwise, the first power consumption is recorded as the intermediate power consumption, and the first operating point is recorded as the intermediate operating point.
Specifically, the method comprises the following steps:
and in the process of continuously increasing the rotating speed, when a second working point occurs, wherein the rotating speed is in the rotating speed interval and the second power consumption is smaller than the first power consumption, the second power consumption and the second working point are respectively recorded as an intermediate power consumption and an intermediate working point.
And when a second working point with the power consumption equal to the first power consumption is acquired in the rotating speed interval or the second working point with the power consumption less than or equal to the first power consumption is not acquired, recording the first power consumption and the first working point as an intermediate power consumption and an intermediate working point respectively.
S3, updating the rotating speed along a second direction by using the rotating speed step length with the first rotating speed as a starting point, and calculating a third working point and a third power consumption corresponding to the updated rotating speed until the third power consumption is less than or equal to the middle power consumption or the updated rotating speed exceeds a rotating speed interval; wherein the second direction has a different direction of numerical change than the first direction.
Specifically, the method comprises the following steps:
the rotating speed step length is a preset rotating speed change step length value. The second direction is a direction of decreasing the rotation speed. Of course, in other embodiments, the first direction and the second direction may be reversed, that is, the first direction is a direction of decreasing the rotation speed, and the second direction is a direction of increasing the rotation speed, and the present invention is not limited in particular.
In this embodiment, the first rotation speed is used as a starting point, the rotation speed step is used as a variation value to continuously reduce the rotation speed, so as to obtain a third operating point and a third power consumption corresponding to the rotation speed after each reduction, until the third operating point with the third power consumption not greater than the intermediate power consumption appears in the rotation speed interval, or the rotation speed exceeds the rotation speed interval.
S4, when judging that the third power consumption smaller than the intermediate power consumption exists, taking a third working point corresponding to the third power consumption as a target working point of the required power; otherwise, taking the intermediate working point corresponding to the intermediate power consumption as the target working point of the required power.
Specifically, the method comprises the following steps:
and in the process of continuously reducing the rotating speed, when a third operating point occurs, wherein the rotating speed is in the rotating speed interval and the third power consumption is smaller than the intermediate power consumption, recording the third operating point as a target operating point.
And recording the intermediate working point as a target working point when the third power consumption is equal to the intermediate power consumption or the third working point with the third power consumption less than or equal to the intermediate power consumption is not acquired in the rotating speed interval.
In this embodiment, the first operating point obtained from the universal characteristic curve of the range extender is used as a starting point to update the rotation speed of the transmitter, and when the operating point with the power consumption lower than the first power consumption of the first operating point exists in the rotation speed interval, the target operating point can be obtained without traversing the whole rotation speed interval in the optimization process. The work load of the optimizing equipment and the range extender is reduced, the optimizing speed is greatly improved, and the method has good practical significance.
As shown in fig. 3, in another embodiment, S104 and S105 specifically include the following steps:
s1, starting at the first rotation speed;
s2, updating the rotating speed along the first direction by the set rotating speed step,
specifically, the step length of the rotating speed is a preset step value of rotating speed change. The first direction is a direction of increasing the rotation speed.
S3, obtaining a second working point and second power consumption according to the changed rotating speed;
s4, when the changed rotating speed is in the rotating speed interval and the second power consumption is larger than the first power consumption, returning to S2;
s5, when the changed rotating speed is in the rotating speed interval and the second power consumption is smaller than the first power consumption, recording the second power consumption of the current rotating speed as intermediate power consumption, and recording a second working point as an intermediate working point; otherwise, recording the first power consumption as an intermediate power consumption, and recording the first working point as an intermediate working point;
s6, starting from the changed rotation speed;
specifically, the method comprises the following steps:
the rotating speed after the previous change is taken as a starting point, so that the optimizing speed and the optimizing precision are improved.
S7, updating the rotating speed in the second direction by the set rotating speed step,
specifically, the method comprises the following steps:
the rotating speed step length is a preset rotating speed change step length value. The second direction is a direction of decreasing the rotation speed.
Of course, in other embodiments, the first direction and the second direction may be reversed, that is, the first direction is a direction of decreasing the rotation speed, and the second direction is a direction of increasing the rotation speed, and the invention is not limited in particular.
S8, obtaining a third working point and third power consumption according to the changed rotating speed;
s9, when the changed rotating speed is in the rotating speed interval and the third power consumption is larger than the middle power consumption, returning to S7;
s10, when the changed rotating speed is in the rotating speed interval and the third power consumption is smaller than the intermediate power consumption, taking a third working point of the current rotating speed as a target working point of the power; and otherwise, taking the intermediate operating point as a target operating point of the power.
In this embodiment, the first operating point obtained from the universal characteristic curve of the range extender is used as a starting point, the rotating speed of the transmitter is updated, and when the operating point with the power consumption lower than the first power consumption of the first operating point exists in the rotating speed interval, the target operating point can be obtained without traversing the whole rotating speed interval in the optimization process. The work load of the optimizing equipment and the range extender is reduced, the optimizing speed is greatly improved, and the method has good practical significance. And when the rotating speed is updated along the second direction, the rotating speed after the previous change is taken as a starting point, so that the optimizing precision is greatly improved.
On the basis of the above-mentioned embodiments, in a preferred embodiment of the present invention,
the following steps are also included before step S101:
s100, acquiring power interval [ P ] of range extendermin,Pmax]Setting the minimum power or the maximum power of the power interval as required power; to achieve a target operating point of minimum or maximum power.
The following steps are also included after step S106:
s107, updating the required power by taking the required power as a starting point according to a preset power step length until the updated required power exceeds a power interval; to obtain target operating points for a plurality of different powers of the power interval.
In this embodiment, the power step is a preset step value of power change.
Updating the power to the increased power when the required power is the minimum power;
and updating the power to the reduced power when the required power is the maximum power.
And acquiring target working points corresponding to different powers in the power interval of the range extender, and recording the target working points in the optimizing equipment or the range extender controller. When the recorded required power appears again, the target working point corresponding to the recorded required power is directly called, so that the range extender can be switched to the optimal working point more quickly, and energy is saved.
Example two:
as shown in fig. 4, a second embodiment of the present invention provides an optimizing device for a working point of a range extender, which includes:
the power acquisition module 401: the power demand of the range extender is obtained;
initial parameter acquisition module 402: the method comprises the steps that a first working point and a rotating speed interval of an engine are obtained according to required power; wherein the first operating point comprises a first rotational speed corresponding to the required power;
an initial power consumption acquisition module: the first power consumption is acquired; the first power consumption is the average power consumption of the engine working at a first working point for a certain time;
the rotation speed updating module 403: the device is used for updating the rotating speed in a rotating speed interval by taking the first rotating speed as a starting point and a preset rotating speed step length to obtain working points and power consumption under different rotating speeds;
target operating point acquisition module 404: when the working point with the power consumption smaller than the first power consumption exists, the working points with the power consumption lower than the first power consumption and the rotating speed closest to the first rotating speed are respectively obtained at two sides of the first rotating speed, and the working point with the lower power consumption is set as a target working point of the required power; otherwise, taking the first operating point as a target operating point of the required power; two sides of the first rotating speed are the directions from the first rotating speed to two end points of the rotating speed interval.
In this embodiment, the initial parameter obtaining module 402: the method is specifically used for:
according to the required power P, obtaining the correspondence from the universal characteristic curve of the range extenderFirst operating point and rotational speed interval (N)min,Nmax) (ii) a Wherein the first operating point comprises a first rotation speed N1And a first torque T1The expression for the first torque is: t is1＝P×9550÷N1。
On the basis of the foregoing embodiment, in a preferred embodiment of the present invention, the rotation speed updating module 403 includes a first rotation speed updating unit and a second rotation speed updating unit, and the target operating point obtaining module 404 includes an intermediate operating point obtaining unit and a target operating point obtaining unit;
the first rotating speed updating unit is used for updating the rotating speed along a first direction by taking the first rotating speed as a starting point and a set rotating speed step length, and calculating a second working point and a second power consumption corresponding to the updated rotating speed until the second power consumption is less than or equal to the first power consumption or the updated rotating speed exceeds a rotating speed interval;
an intermediate operating point acquiring unit, configured to, when it is determined that a second power consumption smaller than the first power consumption exists, take the second power consumption as an intermediate power consumption, and take the second operating point as an intermediate operating point; otherwise, recording the first power consumption as an intermediate power consumption, and recording the first working point as an intermediate working point;
the second rotating speed updating unit is used for updating the rotating speed along a second direction by taking the first rotating speed as a starting point and a rotating speed step length, and calculating a third working point and a third power consumption corresponding to the updated rotating speed until the third power consumption is less than or equal to the middle power consumption or the updated rotating speed exceeds a rotating speed interval; wherein the second direction has a different direction of numerical change from the first direction;
a target operating point obtaining unit, configured to, when it is determined that a third power consumption smaller than the intermediate power consumption exists, take a third operating point corresponding to the third power consumption as a target operating point of the required power; otherwise, taking the intermediate working point corresponding to the intermediate power consumption as the target working point of the required power.
In another embodiment, the rotation speed updating module 403 includes first to fourth units, and sixth to ninth units; the target operating point acquisition module 404 includes a fifth unit and a tenth unit. Wherein the content of the first and second substances,
a first unit, configured to use a first rotation speed as a starting point;
a second unit for updating the rotation speed in the first direction with a set rotation speed step,
a third unit for obtaining a second operating point and a second power consumption according to the changed rotation speed;
the fourth unit is used for returning to the second unit when the changed rotating speed is in the rotating speed interval and the second power consumption is larger than the first power consumption;
a fifth unit, configured to record, when the changed rotation speed is within the rotation speed interval and the second power consumption is smaller than the first power consumption, that the second power consumption of the current rotation speed is an intermediate power consumption, and that the second working point is an intermediate working point; otherwise, recording the first power consumption as an intermediate power consumption, and recording the first working point as an intermediate working point;
a sixth unit for starting from the changed rotation speed;
a seventh unit for updating the rotation speed in the second direction with the set rotation speed step,
an eighth unit for obtaining a third operating point and third power consumption according to the changed rotation speed;
a ninth unit, configured to return to the seventh unit when the changed rotation speed is in the rotation speed interval and the third power consumption is greater than the intermediate power consumption;
a tenth unit, configured to, when the changed rotation speed is within the rotation speed interval and the third power consumption is smaller than the intermediate power consumption, take a third operating point of the current rotation speed as a target operating point of the power; and otherwise, taking the intermediate operating point as a target operating point of the power.
On the basis of the above embodiments, in a preferred embodiment of the present invention, the optimizing device further includes:
a power interval acquisition module: power interval [ P ] for obtaining range extendermin,Pmax]Setting the minimum power or the maximum power of the power interval as required power; to obtain a target operating point of minimum or maximum power;
a power update module: the power control device is used for updating the required power according to a preset power step length by taking the required power as a starting point until the updated required power exceeds a power interval; obtaining a plurality of target operating points with different powers in a power interval; and
example three:
a third embodiment of the present invention provides an optimization device for range extender operating point, which includes a processor, a memory, and a computer program stored in the memory, where the computer program is executable by the processor to implement a method for optimizing a range extender operating point in any of the above paragraphs.
Example four:
the fourth embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute a method for optimizing a range extender operating point in any of the above paragraphs.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus and method embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the present invention or a part thereof, which essentially contributes to the prior art, can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, an electronic device 100, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A method for optimizing working condition points of a range extender is characterized by comprising the following steps:
s1, acquiring the required power of the range extender;
s2, obtaining a first working point and a rotating speed interval of the engine according to the required power; wherein the first operating point comprises a first rotational speed corresponding to the required power;
s3, acquiring first power consumption; wherein the first power consumption is a preset time t for the engine to work at the first working point1Average power consumption of (1);
s4, updating the rotating speed in the rotating speed interval by taking the first rotating speed as a starting point and a preset rotating speed step length to obtain working points and power consumption under different rotating speeds;
s5, when an operating point with power consumption smaller than the first power consumption exists, respectively acquiring operating points with power consumption lower than the first power consumption and with rotating speeds close to the first rotating speed at two sides of the first rotating speed, and setting the operating point with low power consumption as a target operating point of the required power; otherwise, taking the first operating point as the target operating point of the required power; two sides of the first rotating speed are directions from the first rotating speed to two end points of the rotating speed interval;
s4 and S5, specifically including:
updating the rotating speed along a first direction by taking the first rotating speed as a starting point and a set rotating speed step length, and calculating a second working point and a second power consumption corresponding to the updated rotating speed until the second power consumption is less than or equal to the first power consumption or the updated rotating speed exceeds the rotating speed interval;
when judging that second power consumption smaller than the first power consumption exists, recording the second power consumption as intermediate power consumption, and recording a second working point as an intermediate working point; otherwise, recording the first power consumption as an intermediate power consumption, and recording the first working point as an intermediate working point;
updating the rotating speed along a second direction by taking the first rotating speed as a starting point and the rotating speed step length, and calculating a third working point and a third power consumption corresponding to the updated rotating speed until the third power consumption is less than or equal to the intermediate power consumption or the updated rotating speed exceeds the rotating speed interval; wherein the second direction has a different direction of numerical change than the first direction;
when judging that third power consumption smaller than the intermediate power consumption exists, taking a third working point corresponding to the third power consumption as the target working point of the required power; otherwise, taking an intermediate operating point corresponding to the intermediate power consumption as the target operating point of the required power.
2. The method for optimizing the operating point of the range extender according to claim 1, wherein a first operating point and a rotating speed interval of the engine are obtained according to the required power; the method specifically comprises the following steps:
according to the required power P, the corresponding first working point and the corresponding rotating speed interval (N) are obtained from the universal characteristic curve of the range extendermin,Nmax) (ii) a Wherein the first operating point comprises a first rotational speed N1And a first torque T1The expression of the first torque is: t is1＝P×9550÷N1。
3. The method for optimizing the operating point of the range extender according to claim 1, comprising:
obtaining a power interval [ P ] of the range extendermin,Pmax]Setting the minimum power or the maximum power of the power interval as the required power; to obtain a target operating point for the minimum power or the maximum power.
4. The method for optimizing the operating point of the range extender of claim 3, comprising:
updating the required power according to a preset power step length by taking the required power as a starting point until the updated required power exceeds the power interval; to obtain target operating points for a plurality of different powers of the power interval.
5. An optimizing device for working condition points of a range extender is characterized by comprising:
a power acquisition module: the power demand of the range extender is obtained;
an initial parameter acquisition module: the method comprises the steps that a first working point and a rotating speed interval of an engine are obtained according to the required power; wherein the first operating point comprises a first rotational speed corresponding to the required power;
an initial power consumption acquisition module: the first power consumption is acquired; wherein the first power consumption is a preset time t for the engine to work at the first working point1Average power consumption of (1);
a rotating speed updating module: the control circuit is used for updating the rotating speed in the rotating speed interval by taking the first rotating speed as a starting point and a preset rotating speed step length to obtain working points and power consumption under different rotating speeds;
a target operating point acquisition module: when the operating point with the power consumption smaller than the first power consumption exists, the operating points with the power consumption lower than the first power consumption and the rotating speed close to the first rotating speed are respectively obtained at two sides of the first rotating speed, and the operating point with the low power consumption is set as a target operating point of the required power; otherwise, taking the first operating point as the target operating point of the required power; two sides of the first rotating speed are directions from the first rotating speed to two end points of the rotating speed interval;
the rotating speed updating module comprises a first rotating speed updating unit and a second rotating speed updating unit, and the target working point acquiring module comprises an intermediate working point acquiring unit and a target working point acquiring unit;
the first rotating speed updating unit is used for updating the rotating speed along a first direction by taking the first rotating speed as a starting point and a set rotating speed step length, and calculating a second working point and second power consumption corresponding to the updated rotating speed until the second power consumption is less than or equal to the first power consumption or the updated rotating speed exceeds the rotating speed interval;
an intermediate operating point obtaining unit, configured to, when it is determined that there is a second power consumption smaller than the first power consumption, note that the second power consumption is an intermediate power consumption, and the second operating point is an intermediate operating point; otherwise, recording the first power consumption as an intermediate power consumption, and recording the first working point as an intermediate working point;
the second rotating speed updating unit is used for updating the rotating speed along a second direction by taking the first rotating speed as a starting point and the rotating speed step length, and calculating a third working point and a third power consumption corresponding to the updated rotating speed until the third power consumption is less than or equal to the intermediate power consumption or the updated rotating speed exceeds the rotating speed interval; wherein the second direction has a different direction of numerical change than the first direction;
a target operating point obtaining unit, configured to, when it is determined that a third power consumption smaller than the intermediate power consumption exists, take a third operating point corresponding to the third power consumption as the target operating point of the required power; otherwise, taking an intermediate operating point corresponding to the intermediate power consumption as the target operating point of the required power.
6. The device of claim 5, further comprising:
a power interval acquisition module: for obtaining a power interval [ P ] of the range extendermin,Pmax]Setting the minimum power or the maximum power of the power interval as the required power; to obtain a target operating point for the minimum power or the maximum power;
a power update module: the power supply unit is used for updating the required power according to a preset power step length by taking the required power as a starting point until the updated required power exceeds the power interval; obtaining a plurality of target operating points with different powers in the power interval; and
an initial parameter acquisition module: the method is specifically used for:
according to the required power P, the corresponding first working point and the corresponding rotating speed interval (N) are obtained from the universal characteristic curve of the range extendermin,Nmax) (ii) a Wherein the first operating point comprises a first rotational speed N1And a first torque T1The expression of the first torque is: t is1＝P×9550÷N1。
7. An apparatus for optimizing range extender operating point, comprising a processor, a memory, and a computer program stored in the memory, the computer program being executable by the processor to implement a method of optimizing range extender operating point as claimed in any one of claims 1 to 4.
8. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform a method of optimizing a range extender operating point as claimed in any one of claims 1 to 4.
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