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CN107891864B - Method and device for obtaining equivalent oil-electricity conversion coefficient of parallel hybrid power system - Google Patents

Method and device for obtaining equivalent oil-electricity conversion coefficient of parallel hybrid power system Download PDF

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CN107891864B
CN107891864B CN201710947023.7A CN201710947023A CN107891864B CN 107891864 B CN107891864 B CN 107891864B CN 201710947023 A CN201710947023 A CN 201710947023A CN 107891864 B CN107891864 B CN 107891864B
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conversion coefficient
electricity conversion
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equivalent oil
soc
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CN107891864A (en
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魏强
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Beijing Power Source New Energy Technology Co., Ltd.
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Beijing Power Supply New Energy Technology Co ltd
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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
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • 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
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • 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
    • B60W2510/244—Charge state
    • 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
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed

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Abstract

The invention discloses a method and a device for obtaining an equivalent oil-electricity conversion coefficient of a parallel hybrid power system. The method comprises the following steps: determining a basic equivalent oil-electricity conversion coefficient of a parallel hybrid power system; acquiring the SOC of a battery at the current moment, the output power requested by a driver and the vehicle speed; and adjusting the basic equivalent oil-electricity conversion coefficient according to the SOC of the battery at the current moment, the output power requested by the driver and the vehicle speed, and obtaining the equivalent oil-electricity conversion coefficient at the current moment. Therefore, the method and the device do not need to calculate the variation of the SOC, can realize the adjustment of the basic equivalent oil-electricity conversion coefficient by only acquiring the battery state of charge (SOC) at the current moment, the output power requested by a driver and the vehicle speed, avoid the defect that the prior art cannot accurately determine the variation of the SOC to influence the adjustment effect of the equivalent oil-electricity conversion coefficient, and improve the energy-saving effect of the hybrid power system.

Description

Method and device for obtaining equivalent oil-electricity conversion coefficient of parallel hybrid power system
Technical Field
The invention relates to the technical field of hybrid power systems, in particular to a method and a device for obtaining an equivalent oil-electricity conversion coefficient of a parallel hybrid power system.
Background
The hybrid power system can exert the double advantages of high specific energy and high specific power of the internal combustion engine automobile and energy conservation and low emission of the pure electric automobile to the maximum extent. Energy management strategies are key to hybrid power system energy conservation and emissions reduction. According to different algorithms, the energy management strategy of the hybrid power system can be divided into a rule-based energy management strategy and an instantaneous optimization-based energy management strategy, and the minimum equivalent fuel consumption strategy is a typical representative of the instantaneous optimization-based energy management strategy.
The minimum strategy of equivalent oil consumption is based on an optimization theory, and in order to realize the minimum fuel consumption rate at each moment, the equivalent oil-electricity conversion coefficient needs to be adjusted in real time according to the working condition of the hybrid power system. The equivalent fuel-electric conversion coefficient is the amount of fuel required to produce unit energy per unit time.
In the conventional equivalent oil-electricity conversion coefficient acquisition method, a base equivalent oil-electricity conversion coefficient is generally determined according to the operating efficiency of an engine and a motor and the charge-discharge efficiency of a battery, and then the base equivalent oil-electricity conversion coefficient is dynamically corrected according to a state of charge (SOC) of the battery and a variation of the SOC (a difference between the SOC at the current time and the SOC at the historical time). However, the SOC is usually calculated by an algorithm such as an ampere-hour integration method or an open-circuit voltage method, but the algorithm estimates the SOC based on a simple battery model without considering factors such as the temperature and the current of the battery, and therefore the accuracy is low. After the SOC is obtained through the algorithm, if the change of the SOC at the current moment is smaller than that of the SOC at the historical moment, the change of the SOC may not be obtained or the obtained change of the SOC is inaccurate, the adjustment effect of the equivalent oil-electricity conversion coefficient is influenced, and finally the energy-saving effect of the hybrid power system is reduced.
Disclosure of Invention
The invention provides a method and a device for acquiring an equivalent oil-electricity conversion coefficient of a parallel hybrid power system, aiming at solving the problem that the adjustment effect of the equivalent oil-electricity conversion coefficient is influenced by the fact that the variation of an SOC cannot be accurately determined in the prior art.
One embodiment of the present invention provides a method for obtaining an equivalent oil-electricity conversion coefficient of a parallel hybrid system, including:
determining a basic equivalent oil-electricity conversion coefficient of a parallel hybrid power system;
acquiring the SOC of a battery at the current moment, the output power requested by a driver and the vehicle speed;
and adjusting the basic equivalent oil-electricity conversion coefficient according to the SOC of the battery at the current moment, the output power requested by the driver and the vehicle speed, and obtaining the equivalent oil-electricity conversion coefficient at the current moment.
Optionally, determining a base equivalent fuel-electric conversion coefficient of the parallel hybrid system comprises:
determining a basic equivalent oil-electricity conversion coefficient of the parallel hybrid power system according to the following formula:
Figure BDA0001431941540000021
wherein, β0The equivalent oil-electricity conversion coefficient is taken as a basic equivalent oil-electricity conversion coefficient; pbatIs battery power, when Pbat>0 indicates battery discharge, and P isbat<At 0, battery charging is indicated;
Figure BDA0001431941540000022
in order to average the efficiency of the motor,
Figure BDA0001431941540000023
in order to obtain an average discharge efficiency of the battery,
Figure BDA0001431941540000024
for average engine operating efficiency, ηchgFor the current charging efficiency of the battery, QlhvThe fuel oil has low heat value;
Figure BDA0001431941540000025
for average charging efficiency of the battery, ηdisThe current discharge efficiency of the battery.
Optionally, obtaining the equivalent oil-electricity conversion coefficient at the current time includes:
obtaining the equivalent oil-electricity conversion coefficient at the current moment according to the following formula:
β＝β0·βSOC·βpreq·βv
wherein β is the equivalent oil-electricity conversion coefficient at the current moment, β0Based equivalent oil-to-electricity conversion factor, βSOCFor the first reduction factor determined from the state of charge SOC of the battery at the present time, βpreqA second reduction factor determined for the output power requested by the driver at the current moment, βvAnd a third reduction coefficient determined according to the vehicle speed at the current moment.
Optionally, the first reduction factor is inversely related to the state of charge SOC of the battery at the present moment.
Alternatively, the second reduction coefficient is positively correlated with the output power requested by the driver at the present time.
Optionally, the third folding coefficient is positively correlated with the vehicle speed at the current time.
Another embodiment of the present invention provides an equivalent oil-electricity conversion coefficient acquisition apparatus for a parallel hybrid system, including:
the basic equivalent oil-electricity conversion coefficient determining unit is used for determining the basic equivalent oil-electricity conversion coefficient of the parallel hybrid power system;
the working condition acquisition unit is used for acquiring the SOC of the battery at the current moment, the output power requested by a driver and the vehicle speed;
and the equivalent oil-electricity conversion coefficient acquisition unit is used for adjusting the basic equivalent oil-electricity conversion coefficient according to the SOC of the battery at the current moment, the output power requested by the driver and the vehicle speed, and acquiring the equivalent oil-electricity conversion coefficient at the current moment.
Optionally, the base equivalent oil-to-electricity conversion coefficient determining unit is further configured to:
determining a basic equivalent oil-electricity conversion coefficient of the parallel hybrid power system according to the following formula:
Figure BDA0001431941540000031
wherein, β0The equivalent oil-electricity conversion coefficient is taken as a basic equivalent oil-electricity conversion coefficient; pbatIs battery power, when Pbat>0 indicates battery discharge, and P isbat<At 0, battery charging is indicated;
Figure BDA0001431941540000032
in order to average the efficiency of the motor,
Figure BDA0001431941540000033
in order to obtain an average discharge efficiency of the battery,
Figure BDA0001431941540000034
for average engine operating efficiency, ηchgFor the current charging efficiency of the battery, QlhvThe fuel oil has low heat value;
Figure BDA0001431941540000035
for average charging efficiency of the battery, ηdisThe current discharge efficiency of the battery.
Optionally, the equivalent oil-to-electricity conversion coefficient obtaining unit is further configured to:
obtaining the equivalent oil-electricity conversion coefficient at the current moment according to the following formula:
β＝β0·βSOC·βpreq·βv
wherein β is the equivalent oil-electricity conversion coefficient at the current moment, β0Based equivalent oil-to-electricity conversion factor, βSOCA first reduction coefficient determined according to the SOC of the battery at the current moment and inversely related to the SOC of the battery at the current moment βpreqA second reduction factor determined for the output power requested by the driver at the present moment in positive correlation with the output power requested by the driver at the present moment βvAnd the third folding coefficient determined according to the vehicle speed at the current moment is positively correlated with the vehicle speed at the current moment.
Another embodiment of the present invention provides an electronic device, where the electronic device includes a memory and a processor, the memory and the processor are communicatively connected through an internal bus, the memory stores program instructions executable by the processor, and the program instructions, when executed by the processor, enable the method for obtaining an equivalent oil-to-electricity conversion coefficient of a parallel hybrid system to be implemented.
Another embodiment of the present invention provides a computer-readable storage medium storing computer instructions that cause the computer to execute the equivalent oil-to-electricity conversion coefficient acquisition method of a parallel hybrid system described above.
The method has the technical effects that the base equivalent oil-electricity conversion coefficient is adjusted according to the battery state of charge (SOC), the output power requested by the driver and the vehicle speed at the current moment by acquiring the SOC of the battery, the output power requested by the driver and the vehicle speed at the current moment, so that the equivalent oil-electricity conversion coefficient at the current moment is acquired. According to the invention, the adjustment of the basic equivalent oil-electricity conversion coefficient can be realized only by acquiring the battery state of charge (SOC) at the current moment, the output power requested by a driver and the vehicle speed without calculating the variation of the SOC, so that the defect that the adjustment effect of the equivalent oil-electricity conversion coefficient is influenced by the variation of the SOC which cannot be accurately determined in the prior art is avoided, and the energy-saving effect of the hybrid power system is improved.
Drawings
FIG. 1 is a schematic diagram of a parallel hybrid powertrain according to one embodiment of the present invention;
FIG. 2 is a schematic flow chart of an equivalent fuel-electric conversion coefficient obtaining method for a parallel hybrid power system according to an embodiment of the invention;
FIG. 3 is a diagram illustrating a relationship between a first reduction factor and a current battery SOC according to an embodiment of the present invention;
FIG. 4 is a graphical illustration of a second reduction factor versus driver requested output power at the present time in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a third folding factor versus vehicle speed at the present time, in accordance with an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an equivalent oil-to-electricity conversion coefficient acquisition device of a parallel hybrid system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to solve the technical problems in the background art, the inventors of the present application think that the equivalent fuel-electric conversion coefficient at the current time is obtained by obtaining the battery state of charge SOC at the current time, the output power requested by the driver, and the vehicle speed, and adjusting the base equivalent fuel-electric conversion coefficient according to the battery state of charge SOC at the current time, the output power requested by the driver, and the vehicle speed. Therefore, the adjustment of the basic equivalent oil-electricity conversion coefficient can be realized only by acquiring the battery state of charge (SOC) at the current moment, the output power requested by a driver and the vehicle speed without calculating the variation of the SOC, the defect that the variation of the SOC cannot be accurately determined in the prior art to influence the adjustment effect of the equivalent oil-electricity conversion coefficient is overcome, and the energy-saving effect of the hybrid power system is improved.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a parallel hybrid powertrain system according to one embodiment of the present invention. As shown in fig. 1, the output shaft of the engine is connected to the torque coupler through a clutch, the motor is directly connected to the torque coupler, and the output shaft of the torque coupler is directly connected to the input shaft of the transmission. When the clutch is disconnected, the parallel hybrid power system works in an electric only mode; when the clutch is engaged, the parallel hybrid power system can work in an engine independent driving mode, the engine can independently drive the vehicle, and also can work in a hybrid power mode, and the engine and the motor jointly drive the vehicle.
It should be noted that, in order to reduce oil consumption, the parallel hybrid system operates in different operating modes according to the operating conditions. Specifically, when the SOC of the battery is larger than a first preset threshold value, the parallel hybrid power system works in an electric-only mode; when the SOC of the battery is smaller than a second preset threshold value and the vehicle speed is smaller than a preset vehicle speed, the parallel hybrid system works in an engine single driving mode; when the SOC of the battery is larger than a second preset threshold value and smaller than a first preset threshold value and the vehicle speed is larger than a preset vehicle speed, the parallel hybrid power system works in a hybrid power mode.
In the hybrid power mode, in order to achieve the minimum fuel consumption rate at each moment, the embodiment of the invention provides an equivalent oil-electricity conversion coefficient obtaining method. As shown in fig. 2, the method includes:
s21: determining a basic equivalent oil-electricity conversion coefficient of a parallel hybrid power system;
it should be noted that the equivalent fuel-electric conversion coefficient is the amount of fuel required to generate unit energy per unit time. The basic equivalent oil-electricity conversion coefficient can be determined according to the working efficiency of the engine and the motor and the charging and discharging efficiency of the battery.
S22: acquiring the SOC of a battery at the current moment, the output power requested by a driver and the vehicle speed;
the battery state of charge SOC is a ratio of the remaining battery capacity to the fully charged battery capacity, and ranges from 0 to 1, indicating that the battery is fully discharged when the SOC is 0 and fully charged when the SOC is 1. In practical applications, the battery state of charge at the present time can be obtained by the battery management system BMS of the locomotive.
It is understood that the output power requested by the driver at the present time can be obtained from the accelerator pedal opening degree.
S23: and adjusting the basic equivalent oil-electricity conversion coefficient according to the SOC of the battery at the current moment, the output power requested by the driver and the vehicle speed, and obtaining the equivalent oil-electricity conversion coefficient at the current moment.
In the hybrid mode, the engine and the motor drive the vehicle together, and it is necessary to obtain a minimum fuel consumption rate at any time in order to reduce fuel consumption. Specifically, the fuel consumption rate at any time is obtained according to the following formula:
L(t)＝Δme(t)+β·Pb(t)
wherein L (t) is a fuel consumption at an arbitrary timing, Δ me(t) is instantaneous fuel consumption rate of the engine, β is equivalent oil-electricity conversion coefficient at the current moment, Pb(t) is the battery instantaneous power.
Output power P of enginee(t) and battery instantaneous Power Pb(t) satisfying the whole vehicle power balance formula Preq(t)＝Pe(t)+Pb(t); instantaneous fuel consumption rate delta m of enginee(t) is the engine output PeFunction of (t), i.e. Δ me(t)＝f(Pe(t))。
Therefore, let the battery instantaneous power Pb(t) is a control variable, at different Pb(t) under the value, the output power P of the engine can be obtained according to the whole vehicle power balance formulae(t), the minimum fuel consumption rate at any time can be obtained by adjusting the equivalent fuel-electric conversion coefficient β at the current time.
According to the method for obtaining the equivalent oil-electricity conversion coefficient of the parallel hybrid power system, provided by the embodiment of the invention, the change of the SOC is not required to be calculated, the adjustment of the basic equivalent oil-electricity conversion coefficient can be realized only by obtaining the SOC of the battery at the current moment, the output power requested by a driver and the vehicle speed, the defect that the adjustment effect of the equivalent oil-electricity conversion coefficient is influenced by the fact that the change of the SOC cannot be accurately determined in the prior art is overcome, and the energy-saving effect of the hybrid power system is improved.
Specifically, in an alternative implementation of the embodiment of the present invention, determining a base equivalent fuel-to-electricity conversion coefficient of a parallel hybrid system includes:
determining a basic equivalent oil-electricity conversion coefficient of the parallel hybrid power system according to the following formula:
Figure BDA0001431941540000071
wherein, β0The equivalent oil-electricity conversion coefficient is taken as a basic equivalent oil-electricity conversion coefficient; pbatIs battery power, when Pbat>0 indicates battery discharge, and P isbat<At 0, battery charging is indicated;
Figure BDA0001431941540000072
in order to average the efficiency of the motor,
Figure BDA0001431941540000073
in order to obtain an average discharge efficiency of the battery,
Figure BDA0001431941540000074
for average engine operating efficiency, ηchgFor the current charging efficiency of the battery, QlhvThe fuel oil has low heat value;
Figure BDA0001431941540000075
for average charging efficiency of the battery, ηdisThe current discharge efficiency of the battery.
Further, obtaining an equivalent oil-electricity conversion coefficient at the current moment includes:
obtaining the equivalent oil-electricity conversion coefficient at the current moment according to the following formula:
β＝β0·βSOC·βpreq·βv
wherein β is the equivalent oil-electricity conversion coefficient at the current moment, β0Based equivalent oil-to-electricity conversion factor, βSOCFor the first reduction factor determined from the state of charge SOC of the battery at the present time, βpreqA second reduction factor determined for the output power requested by the driver at the current moment, βvAnd a third reduction coefficient determined according to the vehicle speed at the current moment.
It should be noted that in the parallel hybrid power system, the energy source of the battery is fuel oil, that is, the energy source is obtained by active charging or braking energy recovery of the engine, and the equivalent fuel oil consumption of the battery power under different working conditions is different, so that the equivalent fuel-electricity conversion coefficient at the current time needs to be obtained in real time according to the different working conditions, if the equivalent fuel-electricity conversion coefficient at the current time is increased β, the fuel oil becomes cheap, the optimization strategy is biased to use the fuel oil, and if the equivalent fuel-electricity conversion coefficient at the current time is decreased β, the electric energy becomes cheap, and the optimization strategy is biased to use the electric energy.
As shown in fig. 3, the first reduction factor βSOCIt can be understood that when the SOC is larger than a preset SOC value, more electric energy is consumed to reduce oil consumption, namely the equivalent oil-electricity conversion coefficient is reduced to β, otherwise, when the SOC is smaller than the preset SOC value, fuel oil is consumed to carry out active charging, the working efficiency of an engine can be improved, the oil consumption is reduced, namely the equivalent oil-electricity conversion coefficient is increased to β, and β can be determined according to the working condition of a vehicle in practical applicationSOCAnd determining β according to the SOC and the corresponding functional relation after acquiring the SOCSOC。
As shown in fig. 4, the second reduction factor βpreqOutput power P corresponding to the driver's request at the present momentreqAnd (4) positively correlating. It can be understood that if the active charging is too much, energy is greatly lost in the process that the motor generates electricity to charge the battery and the motor drives to consume the energy of the battery, so that the reduction of the proportion of the active charging is one of means for improving the economy of the hybrid electric vehicle. So when P isreqGreater than a predetermined PreqWhen the value is high, the efficiency of the engine is high, so that the active charging proportion is reduced, namely the equivalent fuel-electricity conversion coefficient β is increased, otherwise, PreqLess than a predetermined PreqWhen the engine efficiency is low, the active charging proportion is properly increased, namely the equivalent fuel-electric conversion coefficient β is reduced, and in practical application, β can be determined according to the working condition of a vehiclepreqAnd PreqWhen P is obtainedreqThen according to PreqAnd corresponding functional relationship determination βpreq。
As shown in fig. 5, the third folding factor βvIt can be understood that when the vehicle speed is greater than the preset vehicle speed, the efficiency of the engine is higher, the active charging proportion is reduced, namely the equivalent fuel-electric conversion coefficient is increased β, otherwise, when the vehicle speed is less than the preset vehicle speed, the efficiency of the engine is lower, the active charging proportion can be properly increased, namely the equivalent fuel-electric conversion coefficient is reduced β, and β can be determined according to the working condition of the vehicle in practical applicationvAnd determining β according to the current vehicle speed and the corresponding functional relation after the current vehicle speed is obtainedv。
Fig. 6 is a schematic structural diagram of an equivalent oil-to-electricity conversion coefficient acquisition device of a parallel hybrid system according to an embodiment of the present invention. As shown in fig. 6, the apparatus includes: the basic equivalent oil-electricity conversion coefficient determining unit 61, the working condition obtaining unit 62 and the equivalent oil-electricity conversion coefficient obtaining unit 63 specifically:
the basic equivalent oil-electricity conversion coefficient determining unit 61 is used for determining the basic equivalent oil-electricity conversion coefficient of the parallel hybrid power system;
a working condition obtaining unit 62, configured to obtain a battery state of charge SOC at the current time, output power requested by a driver, and a vehicle speed;
and the equivalent oil-electricity conversion coefficient obtaining unit 63 is configured to adjust the basic equivalent oil-electricity conversion coefficient according to the battery state of charge SOC at the current time, the output power requested by the driver, and the vehicle speed, and obtain the equivalent oil-electricity conversion coefficient at the current time.
According to the equivalent oil-electricity conversion coefficient acquisition device of the parallel hybrid power system, provided by the embodiment of the invention, the adjustment of the basic equivalent oil-electricity conversion coefficient can be realized only by acquiring the battery state of charge (SOC) at the current moment, the output power requested by a driver and the vehicle speed without calculating the variation of the SOC, the defect that the adjustment effect of the equivalent oil-electricity conversion coefficient is influenced by the fact that the variation of the SOC cannot be accurately determined in the prior art is overcome, and the energy-saving effect of the hybrid power system is improved.
The base equivalent oil-to-electricity conversion coefficient determination unit 61 is further configured to:
determining a basic equivalent oil-electricity conversion coefficient of the parallel hybrid power system according to the following formula:
Figure BDA0001431941540000091
wherein, β0The equivalent oil-electricity conversion coefficient is taken as a basic equivalent oil-electricity conversion coefficient; pbatIs battery power, when Pbat>0 indicates battery discharge, and P isbat<At 0, battery charging is indicated;
Figure BDA0001431941540000092
in order to average the efficiency of the motor,
Figure BDA0001431941540000093
in order to obtain an average discharge efficiency of the battery,
Figure BDA0001431941540000094
for average engine operating efficiency, ηchgFor the current charging efficiency of the battery, QlhvThe fuel oil has low heat value;
Figure BDA0001431941540000095
for average charging efficiency of the battery, ηdisThe current discharge efficiency of the battery.
The equivalent oil-to-electricity conversion coefficient obtaining unit 63 is further configured to:
obtaining the equivalent oil-electricity conversion coefficient at the current moment according to the following formula:
β＝β0·βSOC·βpreq·βv
wherein β is the equivalent oil-electricity conversion coefficient at the current moment, β0Based equivalent oil-to-electricity conversion factor, βSOCA first reduction coefficient determined according to the SOC of the battery at the current moment and inversely related to the SOC of the battery at the current moment βpreqA second reduction factor determined for the output power requested by the driver at the present moment in positive correlation with the output power requested by the driver at the present moment βvAccording to the current timeAnd the third folding coefficient of the speed determination is positively correlated with the vehicle speed at the current moment.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 7, the electronic device includes a memory 71 and a processor 72, the memory 71 and the processor 72 are communicatively connected through an internal bus 73, the memory 71 stores program instructions executable by the processor 72, and the program instructions, when executed by the processor 72, enable the equivalent oil-to-electricity conversion coefficient obtaining method of the parallel hybrid system described above to be implemented.
Furthermore, the logic instructions in the memory 72 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. 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, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. 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.
Another embodiment of the present invention provides a computer-readable storage medium storing computer instructions that cause the computer to execute the equivalent oil-to-electricity conversion coefficient acquisition method of a parallel hybrid system described above.
In summary, according to the technical scheme of the present invention, the base equivalent oil-electricity conversion coefficient is adjusted according to the battery state of charge SOC at the current time, the output power requested by the driver, and the vehicle speed by obtaining the battery state of charge SOC at the current time, the output power requested by the driver, and the vehicle speed, so as to obtain the equivalent oil-electricity conversion coefficient at the current time. According to the invention, the adjustment of the basic equivalent oil-electricity conversion coefficient can be realized only by acquiring the battery state of charge (SOC) at the current moment, the output power requested by a driver and the vehicle speed without calculating the variation of the SOC, so that the defect that the adjustment effect of the equivalent oil-electricity conversion coefficient is influenced by the variation of the SOC which cannot be accurately determined in the prior art is avoided, and the energy-saving effect of the hybrid power system is improved.
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 (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing 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.
It is to be noted that 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 a process, method, article, or apparatus that comprises the element.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
While the foregoing is directed to embodiments of the present invention, other modifications and variations of the present invention may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the appended claims.

Claims (9)

1. The method for obtaining the equivalent oil-electricity conversion coefficient of the parallel hybrid power system is characterized by comprising the following steps of:
determining a basic equivalent oil-electricity conversion coefficient of the parallel hybrid power system;
acquiring the SOC of a battery at the current moment, the output power requested by a driver and the vehicle speed;
adjusting the basic equivalent oil-electricity conversion coefficient according to the SOC of the battery at the current moment, the output power requested by a driver and the vehicle speed to obtain the equivalent oil-electricity conversion coefficient at the current moment;
the obtaining of the equivalent oil-electricity conversion coefficient at the current moment includes:
obtaining the equivalent oil-electricity conversion coefficient at the current moment according to the following formula:
β＝β0·βSOC·βpreq·βv
wherein β is the equivalent oil-electricity conversion coefficient at the current moment, β0Based equivalent oil-to-electricity conversion factor, βSOCFor the first reduction factor determined from the state of charge SOC of the battery at the present time, βpreqA second reduction factor determined for the output power requested by the driver at the current moment, βvAnd a third reduction coefficient determined according to the vehicle speed at the current moment.
2. The method of claim 1, wherein the determining a base equivalent fuel-to-electric conversion factor for the parallel hybrid powertrain system comprises:
determining a base equivalent oil-electricity conversion coefficient of the parallel hybrid power system according to the following formula:
Figure FDA0002261118690000011
wherein, β0The equivalent oil-electricity conversion coefficient is taken as a basic equivalent oil-electricity conversion coefficient; pbatIs battery power, when Pbat>0 indicates battery discharge, and P isbat<At 0, battery charging is indicated;
Figure FDA0002261118690000012
in order to average the efficiency of the motor,
Figure FDA0002261118690000013
in order to obtain an average discharge efficiency of the battery,
Figure FDA0002261118690000014
for average engine operating efficiency, ηchgFor the current charging efficiency of the battery, QlhvThe fuel oil has low heat value;
Figure FDA0002261118690000015
for average charging efficiency of the battery, ηdisThe current discharge efficiency of the battery.
3. The method of claim 1, wherein the first reduction factor is inversely related to the battery state of charge (SOC) at the current time.
4. The method according to claim 1, characterized in that the second reduction factor is positively correlated with the output power requested by the driver at the current time.
5. The method of claim 1, wherein the third folding factor is positively correlated with the vehicle speed at the current time.
6. An equivalent oil-electricity conversion coefficient acquisition device of a parallel hybrid power system is characterized by comprising:
the basic equivalent oil-electricity conversion coefficient determining unit is used for determining the basic equivalent oil-electricity conversion coefficient of the parallel hybrid power system;
the working condition acquisition unit is used for acquiring the SOC of the battery at the current moment, the output power requested by a driver and the vehicle speed;
the equivalent oil-electricity conversion coefficient acquisition unit is used for adjusting the basic equivalent oil-electricity conversion coefficient according to the battery SOC at the current moment, the output power requested by a driver and the vehicle speed to acquire the equivalent oil-electricity conversion coefficient at the current moment;
the equivalent oil-electricity conversion coefficient obtaining unit is further used for:
obtaining the equivalent oil-electricity conversion coefficient at the current moment according to the following formula:
β＝β0·βSOC·βpreq·βv
wherein β is the equivalent oil-electricity conversion coefficient at the current moment, β0Based equivalent oil-to-electricity conversion factor, βSOCA first reduction coefficient determined according to the SOC of the battery at the current moment and negatively correlated with the SOC of the battery at the current moment βpreqA second reduction factor determined for the output power requested by the driver at the current moment in positive correlation with the output power requested by the driver at the current moment βvAnd the third folding coefficient is determined according to the vehicle speed at the current moment and is positively correlated with the vehicle speed at the current moment.
7. The apparatus of claim 6, wherein the base equivalent oil-to-electricity conversion coefficient determining unit is further configured to:
determining a base equivalent oil-electricity conversion coefficient of the parallel hybrid power system according to the following formula:
Figure FDA0002261118690000021
wherein, β0The equivalent oil-electricity conversion coefficient is taken as a basic equivalent oil-electricity conversion coefficient; pbatIs battery power, when Pbat>0 indicates battery discharge, and P isbat<At 0, battery charging is indicated;
Figure FDA0002261118690000022
in order to average the efficiency of the motor,
Figure FDA0002261118690000023
in order to obtain an average discharge efficiency of the battery,
Figure FDA0002261118690000031
for average engine operating efficiency, ηchgFor the current charging efficiency of the battery, QlhvThe fuel oil has low heat value;
Figure FDA0002261118690000032
average charging efficiency for batteryRate, ηdisThe current discharge efficiency of the battery.
8. The apparatus according to claim 6, wherein the second reduction factor is positively correlated with the output power requested by the driver at the present time; and the third folding coefficient is positively correlated with the vehicle speed at the current moment.
9. An electronic device, comprising a memory and a processor, wherein the memory and the processor are connected through an internal bus in a communication manner, the memory stores program instructions executable by the processor, and the program instructions, when executed by the processor, can implement the equivalent oil-to-electricity conversion coefficient acquisition method for a parallel hybrid system according to any one of claims 1 to 5.
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