CN111002867A - Electric power distribution method and device of hybrid power system and hybrid power automobile - Google Patents

Electric power distribution method and device of hybrid power system and hybrid power automobile Download PDF

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CN111002867A
CN111002867A CN202010159474.6A CN202010159474A CN111002867A CN 111002867 A CN111002867 A CN 111002867A CN 202010159474 A CN202010159474 A CN 202010159474A CN 111002867 A CN111002867 A CN 111002867A
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power
torque
motor
electronic supercharger
maximum
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CN111002867B (en
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柏道齐
朱海峰
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AVL List Technical Center Shanghai Co Ltd
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AVL List Technical Center Shanghai Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
    • B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/423—Torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/08—Electric propulsion units
    • B60W2710/083—Torque
    • 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
    • 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
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Automation & Control Theory (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Supercharger (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The embodiment of the invention discloses an electric power distribution method and device of a hybrid power system and a hybrid power automobile. The electric power distribution method includes: distributing the maximum discharge power of the high-voltage battery to the DC-DC module, the electronic supercharger and the at least one motor at a preset distribution coefficient; calculating the total torque generated by the electronic supercharger and the at least one motor according to the preset distribution coefficient; acquiring maximum total torque under different preset distribution coefficients and a distribution coefficient corresponding to the maximum total torque; and obtaining a rotating speed limit value of the electronic supercharger and a torque limit value of the at least one motor according to the distribution coefficient. The embodiment of the invention can calculate the distribution coefficient which maximizes the torque in real time, so that the hybrid electric vehicle obtains the best performance of a power system under the condition of limiting the battery power, and the maximization of the traction torque is realized.

Description

Electric power distribution method and device of hybrid power system and hybrid power automobile
Technical Field
The embodiment of the invention relates to the technical field of hybrid electric vehicles, in particular to an electric power distribution method and device of a hybrid electric system and a hybrid electric vehicle.
Background
With the improvement of the electrification degree of the automobile power system, the hybrid electric vehicle has obvious advantages in various performance indexes such as reduction of oil consumption, improvement of driving performance and the like. In addition, for the engine, on the premise of the same torque performance, the engine can be made to be smaller by additionally arranging the electronic supercharger. In order to achieve better performance of the hybrid electric vehicle, one or more electric motors and additional electronic superchargers may be included in the hybrid system of the hybrid electric vehicle, forming a complex hybrid system.
In the prior art, for a complex hybrid power system, in order to prevent the system from exceeding the limit, especially when the derating limit of a battery system is caused by the state of charge, low voltage or temperature, the use opportunity of the electronic supercharger is limited mainly by reducing the torque of a motor. And the priority among different components is usually a fixed value, and the control scheme is usually determined by different power system functions and cannot ensure that the total traction of the hybrid electric vehicle is optimized.
Disclosure of Invention
The embodiment of the invention provides an electric power distribution method and device of a hybrid power system and a hybrid power automobile, so that the hybrid power automobile obtains the best performance expression of the power system under the condition of limiting battery power and the maximum traction torque is realized.
In a first aspect, embodiments of the present invention provide an electric power distribution method for a hybrid system, the hybrid system including an internal combustion engine, a high voltage battery, and a DC-DC module, an electronic supercharger, and at least one electric machine, powered by the high voltage battery;
The electric power distribution method includes:
Distributing the maximum discharge power of the high-voltage battery to the DC-DC module, the electronic supercharger and the at least one motor at a preset distribution coefficient;
Calculating the total torque generated by the electronic supercharger and the at least one motor according to the preset distribution coefficient;
Acquiring maximum total torque under different preset distribution coefficients and a distribution coefficient corresponding to the maximum total torque;
And obtaining a rotating speed limit value of the electronic supercharger and a torque limit value of the at least one motor according to the distribution coefficient.
Optionally, distributing the maximum discharge power of the high voltage battery to the DC-DC module, the electronic supercharger, and the at least one motor at a preset distribution coefficient, comprising:
The maximum discharge power of the high-voltage battery comprises power and torque power required by the DC-DC module; wherein the power required by the electronic supercharger and the at least one electric machine is divided by the torque power.
Optionally, the at least one motor comprises a first motor and a second motor;
The distribution coefficient of the first motor is a, the distribution coefficient of the second motor is b(1-a), and the distribution coefficient of the electronic supercharger is (r) The distribution coefficient is (1-b) (1-a); wherein,a∈[0:1]，b∈[0:1].
Optionally, the calculating a total torque generated by the electronic supercharger and the at least one electric machine according to the preset distribution coefficient includes:
The values of the distribution coefficients a comprise m, and the values of the distribution coefficients b comprise n;
Constructing a torque maximization matrix with dimension m x n as:
Figure 100002_DEST_PATH_IMAGE002
Wherein i is less than or equal to m, and j is less than or equal to n;
And identifying the maximum value in the torque maximization matrix, and correspondingly finding out the value of the distribution coefficient a and the value of the distribution coefficient b.
Optionally, the
Figure 100002_DEST_PATH_IMAGE004
The calculation of (a) includes:
Figure 100002_DEST_PATH_IMAGE006
Wherein,
Figure 100002_DEST_PATH_IMAGE008
Is the power of the torque to be transmitted,
Figure 100002_DEST_PATH_IMAGE010
Is the torque coefficient of the first electrical machine,
Figure 100002_DEST_PATH_IMAGE012
Is the power limit of the first motor,
Figure 100002_DEST_PATH_IMAGE014
Is a function of the power-calculated torque of the electronic supercharger,
Figure 100002_DEST_PATH_IMAGE016
Is the power limit of the electronic supercharger,
Figure 100002_DEST_PATH_IMAGE018
Is the torque coefficient of the second electrical machine,
Figure 100002_DEST_PATH_IMAGE020
Is the power limit of the second motor.
Optionally, the obtaining a rotation speed limit of the electronic supercharger and a torque limit of the at least one electric machine according to the distribution coefficient includes:
According to the distribution coefficient, a power splitting matrix of the distribution coefficient is constructed, and the maximum power value of the electronic supercharger and the maximum power value of the at least one motor are obtained; wherein the power splitting matrix is:
Wherein,
Figure 100002_DEST_PATH_IMAGE024
Is the maximum discharge power of the battery,
Figure 100002_DEST_PATH_IMAGE026
Is the required power of the electronic supercharger,
Figure 100002_DEST_PATH_IMAGE028
Is the required power of the second electrical machine,
Figure 100002_DEST_PATH_IMAGE030
Is the power required by the first electric machine,
Figure 100002_DEST_PATH_IMAGE032
Is the required power of the DC-DC module,
Figure 100002_DEST_PATH_IMAGE034
Is the maximum power of the electronic supercharger,
Figure 100002_DEST_PATH_IMAGE036
Is the maximum power of the second motor,
Figure 100002_DEST_PATH_IMAGE038
Is the maximum power of the first motor,
Figure 100002_DEST_PATH_IMAGE040
Is the maximum power of the DC-DC module.
Optionally, after obtaining the maximum power value of the electronic supercharger and the maximum power value of the at least one electric motor according to the distribution coefficient, the method further includes:
And obtaining a rotating speed limit value of the electronic supercharger and a torque limit value of the at least one electric machine according to the maximum power value of the electronic supercharger and the maximum power value of the at least one electric machine.
In a second aspect, embodiments of the present invention further provide an electric power distribution apparatus of a hybrid system, the hybrid system including an internal combustion engine, a high-voltage battery, and a DC-DC module, an electronic supercharger, and at least one electric machine that are powered by the high-voltage battery;
The electric power distribution device includes:
The preset distribution module is used for distributing the maximum discharge power of the high-voltage battery to the DC-DC module, the electronic supercharger and the at least one motor according to a preset distribution coefficient;
The total torque calculation module is used for calculating the total torque generated by the electronic supercharger and the at least one motor according to the preset distribution coefficient;
The distribution coefficient acquisition module is used for acquiring maximum total torque under different preset distribution coefficients and the distribution coefficient corresponding to the maximum total torque;
And the limit value acquisition module is used for obtaining a rotating speed limit value of the electronic supercharger and a torque limit value of the at least one motor according to the distribution coefficient.
In a third aspect, embodiments of the present invention further provide a hybrid vehicle, where the hybrid system includes an internal combustion engine, a high-voltage battery, and a DC-DC module powered by the high-voltage battery, an electronic supercharger, at least one electric machine, and a controller;
Wherein the controller implements a method according to any embodiment of the invention.
Optionally, the at least one motor comprises a first motor and a second motor; the first motor is mounted on a front shaft of the hybrid electric vehicle, and the second motor is mounted on a rear shaft of the hybrid electric vehicle.
The embodiment of the invention distributes the maximum discharge power of the high-voltage battery to the DC-DC module, the electronic supercharger and at least one motor by a preset distribution coefficient; then, calculating the total torque generated by the electronic supercharger and the at least one motor according to the preset distribution coefficient; the maximum total torque under different preset distribution coefficients and the distribution coefficient corresponding to the maximum total torque are obtained, and then the rotating speed limit value of the electronic supercharger and the torque limit value of the at least one motor are obtained according to the distribution coefficients, so that the hybrid power system can be ensured to obtain the best performance under all working conditions, particularly when the battery system is limited in derating due to the electric quantity state, the low voltage or the temperature, the distribution coefficient for maximizing the torque is calculated in real time, the situation that the power of a high-voltage battery is prevented from exceeding the limit only by limiting the using time of the electronic supercharger is avoided, the best power distribution to a DC-DC module and each electric actuator is realized under the condition of limiting the power of the high-voltage battery, and the maximum traction torque and the best performance of the power system are realized.
Drawings
FIG. 1 is a schematic structural diagram of a hybrid power system according to an embodiment of the present invention;
FIG. 2 is a schematic representation of the power flow of a hybrid powertrain system provided by an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for distributing electric power for a hybrid powertrain according to an embodiment of the present invention;
FIG. 4 is a graphical illustration of actual power delivered to an electric supercharger as a function of additional torque added thereto in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of an electric power distribution of a hybrid powertrain system provided by an embodiment of the present invention;
FIG. 6 is a graphical illustration of the actual distributed power of an electronic supercharger as a function of its actual rotational speed provided by an embodiment of the present invention;
FIG. 7 is a schematic flow chart illustrating a method for allocating electric power to a hybrid powertrain according to an embodiment of the present invention;
Fig. 8 is a schematic structural diagram of an electric power distribution device of a hybrid power system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a hybrid system according to an embodiment of the present invention, and referring to fig. 1, the hybrid system includes an internal combustion engine 110, a high voltage battery 210, and a DC-DC module 220 powered by the high voltage battery 210, an electronic supercharger 230, and at least one electric machine. Fig. 1 shows two electric machines as an example, a first electric machine 240 and a second electric machine 250, which first electric machine 240 and second electric machine 250 can be mounted on a front axle and a rear axle of a hybrid vehicle, respectively, for example. The first electric machine 240 is connected with the front wheel 310 through the gearbox 330, and the first transmission ratio from the first electric machine 240 to the front wheel is set; the second motor 250 is connected to the rear wheel 320 through a reducer 340, and the second motor 250 and the rear wheel 320 are set to a second gear ratio. The hybrid system further includes: controller 260, throttle 120, intercooler 130, bypass valve 140, compressor 150, turbocharger 160, and waste gate valve 170. Pipelines are arranged among the internal combustion engine 110, the throttle valve 120, the intercooler 130, the bypass valve 140, the electronic supercharger 230, the compressor 150, the turbocharger 160 and the waste gate valve 170 for air flow transmission. The electronic supercharger 230 is powered by the high voltage battery 210 and controlled by the controller 260, and the electronic supercharger 230 may provide additional intake pressure on the intake performance of the internal combustion engine 110, thereby increasing the torque of the internal combustion engine 110. In addition, the high voltage battery 210 is also connected to the DC-DC module 220, the first motor 240, and the second motor 250, and the high voltage battery 210 supplies electric power to the DC-DC module 220, the first motor 240, and the second motor 250. The controller 260 is also connected to the high voltage battery 210, the DC-DC module 220, the first motor 240, and the second motor 250, and the controller 260 controls the operation states of the high voltage battery 210, the DC-DC module 220, the first motor 240, and the second motor 250 and distributes electric power. It can be seen that the overall system is controlled by a controller 260, which controller 260 determines the timing of the operation of each component and distributes the required electrical power to the DC-DC module 220, the at least one electric machine (e.g., the first electric machine 240 and the second electric machine 250), and the electric supercharger.
Fig. 2 is a schematic diagram of power flow of a hybrid power system according to an embodiment of the present invention. Referring to fig. 2, the high voltage battery 210 is electrically connected to the DC-DC module 220, the electronic supercharger 230, the first motor 240 and the second motor 250 . The power of the DC-DC module 220 is
Figure DEST_PATH_IMAGE042
The electric power of the electronic supercharger 230 is
Figure DEST_PATH_IMAGE044
The electric power of the first motor 240 is
Figure DEST_PATH_IMAGE046
The electric power of the second motor 250 is
Figure DEST_PATH_IMAGE048
. The torque of the first electric machine 240 is
Figure DEST_PATH_IMAGE050
The first motor 240 is mechanically coupled to the conveyor belt. The electric supercharger 230 increases the power of the internal combustion engine 110 by
Figure DEST_PATH_IMAGE052
. The torque of the internal combustion engine 110 is
Figure DEST_PATH_IMAGE054
The internal combustion engine 110 is mechanically connected to the belt and the torque transferred to the gearbox 330 is
Figure DEST_PATH_IMAGE056
. The torque output from the transmission 330 to the front axle is
Figure DEST_PATH_IMAGE058
. The second motor 250 is mechanically connected with the speed reducer 340, and the torque transmitted to the speed reducer 340 by the second motor 250 is
Figure DEST_PATH_IMAGE060
The torque output from the reducer 340 to the rear axle is
Figure DEST_PATH_IMAGE062
. It can be seen that the electric power of the hybrid system for actuators such as DC-DC modules and electric actuators (motors and electronic superchargers) The ratio split determines the total torque produced by the hybrid powertrain.
The embodiment of the invention provides an electric power distribution method of a hybrid power system. The electric power distribution method is suitable for hybrid power systems with electronic superchargers, particularly suitable for hybrid power systems shown in figures 1 and 2, and is used for distributing electric power of actuators such as DC-DC modules, motors and electronic superchargers in the hybrid power system in the same high-voltage battery system. The electric power distribution method is controlled by a controller, which is integrated in the hybrid system. Fig. 3 is a schematic flowchart of an electric power distribution method of a hybrid power system according to an embodiment of the present invention, and referring to fig. 3, the electric power distribution method of the hybrid power system includes the following steps:
And S110, distributing the maximum discharge power of the high-voltage battery to the DC-DC module, the electronic supercharger and the at least one motor according to a preset distribution coefficient.
The preset distribution coefficient comprises a distribution coefficient of a DC-DC module, a distribution coefficient of an electronic supercharger and a distribution coefficient of at least one motor. The preset distribution coefficient is based on the maximum discharge power of the high-voltage battery, and determines the maximum power that can be obtained by the DC-DC module, the electronic supercharger and the at least one motor. The preset distribution coefficients can take a plurality of groups of different values, and the optimal group of the preset distribution coefficients can be selected by comparing the plurality of groups of the preset distribution coefficients.
And S120, calculating the total torque generated by the electronic supercharger and the at least one motor according to a preset distribution coefficient.
In which an electronic supercharger assists an internal combustion engine to produce additional torque, the method of determining the additional torque produced by the electronic supercharger is, for example, measured. As shown in fig. 4, the function g1 is a function of the measured power of the electronic supercharger and the additional torque produced by the electronic supercharger. In addition, the torque generated by the motor can be calculated by a torque formula.
And S130, acquiring the maximum total torque under different preset distribution coefficients and the distribution coefficient corresponding to the maximum total torque.
In this case, the larger the preset distribution coefficient is, the larger the electric power obtained for each electric actuator is, however, since the total power of the high-voltage battery is fixed, if the distribution coefficient to the electric motor is high, the distribution coefficient to the electric supercharger becomes low. The electronic supercharger and the motor can both contribute to the traction of the hybrid power system, so that the total torque under different preset distribution coefficients is calculated, the preset distribution coefficient corresponding to the maximum total torque is selected, and the preset distribution coefficient is the distribution coefficient adopted in the subsequent calculation.
And S140, obtaining a rotating speed limit value of the electronic supercharger and a torque limit value of at least one motor according to the distribution coefficient.
The electric power of the DC-DC module, the electric power of the electronic supercharger and the electric power of the at least one electric machine, which are determined by the division factor, are already distributed, i.e. the DC-DC module, the electronic supercharger and the at least one electric machine acquire their respective electric power limits in response to the power limit of the high-voltage battery. The power limit value of the electronic supercharger corresponds to the rotating speed limit value of the electronic supercharger, and the rotating speed limit value is used for further controlling the electronic supercharger; the power limit of the electric machine corresponds to a torque limit of the electric machine, which is used for further controlling the electric machine.
According to the embodiment of the invention, the distribution coefficient for maximizing the torque can be calculated in real time through the steps, the condition that the power of the high-voltage battery is prevented from exceeding the limit only by limiting the use time of the electronic supercharger is avoided, the optimal power distribution to the DC-DC module and each electric actuator under the condition that the power of the high-voltage battery is limited is realized, and the maximization of the traction torque and the optimal performance expression of a power system are realized.
FIG. 5 is a schematic diagram of an electric power distribution of a hybrid powertrain system provided by an embodiment of the present invention. Referring to fig. 5, on the basis of the above embodiments, optionally, the DC-DC module has the highest priority, and the high-voltage battery preferentially provides the electric energy to the DC-DC module when the maximum discharge power of the high-voltage battery is at the time
Figure DEST_PATH_IMAGE064
Including power required by the DC-DC module
Figure DEST_PATH_IMAGE066
And torque power
Figure DEST_PATH_IMAGE068
(ii) a Wherein the power required by the electric supercharger and the at least one electric machine is the torque power
Figure 204174DEST_PATH_IMAGE068
And (6) distributing. Illustratively, the electric machines of FIG. 5 include a first electric machine and a second electric machine, torque power
Figure 668785DEST_PATH_IMAGE068
Including the electric power PeSCmax of the electronic supercharger, the electric power PEM1max of the first motor and the electric power PEM2max of the second motor. The embodiment of the invention ensures that the DC-DC module can work stably and effectively, thereby ensuring the normal operation of the whole vehicle and further optimizing the performance of the hybrid power system.
null
On the basis of the above embodiments, optionally, calculating the total torque generated by the electric supercharger and the at least one electric machine according to a preset distribution coefficient comprises: firstly, the values of the distribution coefficients a include m, and the values of the distribution coefficients b include n. Exemplarily, the distribution coefficient a is equally divided into m-1 parts from 0 to 1, and values of m distribution coefficients a with equal intervals can be obtained; the distribution coefficient b is equally divided into n-1 parts from 0 to 1, and values of n distribution coefficients b with equal intervals can be obtained.
Then, a torque maximization matrix with dimension m × n is constructed as:
Figure DEST_PATH_IMAGE002A
Wherein i is less than or equal to m, and j is less than or equal to n;
And finally, identifying the maximum value in the torque maximization matrix, and correspondingly finding out the value of the distribution coefficient a and the value of the distribution coefficient b.
Thus, embodiments of the present invention create a matrix of dimension m x n generated from two vectors a and b
Figure DEST_PATH_IMAGE070
Vector of motion
Figure DEST_PATH_IMAGE072
Is m, vector
Figure DEST_PATH_IMAGE074
Has a length of n, having a value of
Figure DEST_PATH_IMAGE076
，
Figure DEST_PATH_IMAGE078
. Real-time computation of each unit
Figure 589467DEST_PATH_IMAGE004
Identifying the maximum value in the matrix
Figure DEST_PATH_IMAGE080
Is indexed by
Figure DEST_PATH_IMAGE082
And finding corresponding values of a and b to obtain the priority distribution of the electronic supercharger, the first motor and the second motor.
In the above-described embodiments, the first and second optical elements may, optionally,
Figure 46993DEST_PATH_IMAGE004
The calculation of (a) includes:
Figure DEST_PATH_IMAGE006A
Wherein,
Figure 471153DEST_PATH_IMAGE008
Is the power of the torque to be transmitted,
Figure 28036DEST_PATH_IMAGE010
Is the torque coefficient of the first electrical machine,
Figure 91807DEST_PATH_IMAGE012
Is the power limit of the first motor,
Figure 569668DEST_PATH_IMAGE014
Is a function of the power-calculated torque of the electronic supercharger,
Figure 645072DEST_PATH_IMAGE016
Is the power limit of the electronic supercharger,
Figure 904015DEST_PATH_IMAGE018
Is the torque coefficient of the second electrical machine,
Figure DEST_PATH_IMAGE084
Is the power limit of the second motor. Alternatively,
Figure DEST_PATH_IMAGE086
，
Figure DEST_PATH_IMAGE088
Wherein
Figure DEST_PATH_IMAGE090
Is a front axle transmission ratio, calculated or estimated by the control unit on the basis of the actual gear, or may be a fixed parameter,
Figure DEST_PATH_IMAGE092
Is the efficiency of the first motor, is calculated by looking up a table according to the current rotating speed and the required torque of the motor,
Figure DEST_PATH_IMAGE094
The rotating speed of the first motor can be measured or estimated by the first motor, or calculated according to the corresponding speed ratio and the current vehicle speed, or calculated according to the corresponding speed ratio and the rotating speed of the engine,
Figure DEST_PATH_IMAGE096
Is the ratio of the electric machine to the internal combustion engine, usually constant,
Figure DEST_PATH_IMAGE098
Is the transmission ratio between the second motor and the rear wheel, which may be a simple parameter, or may be calculated using a more complex model,
Figure DEST_PATH_IMAGE100
Is the efficiency of the second motor, is calculated by looking up a table according to the current rotating speed and the required torque of the motor,
Figure DEST_PATH_IMAGE102
The rotating speed of the second motor is measured or estimated by the second motor or calculated according to the transmission ratio of the speed reducer and the current vehicle speed,
Figure DEST_PATH_IMAGE104
Is the efficiency of the retarder and may be an estimate.
Figure DEST_PATH_IMAGE106
The derivation of the calculation is as follows:
Figure DEST_PATH_IMAGE108
Figure DEST_PATH_IMAGE110
Figure DEST_PATH_IMAGE112
Figure DEST_PATH_IMAGE114
Figure DEST_PATH_IMAGE116
=
Figure DEST_PATH_IMAGE118
Wherein,
Figure DEST_PATH_IMAGE120
Is the total torque required by the front and rear axles, is calculated by the control unit from the driver demand (usually the accelerator pedal),
Figure 462604DEST_PATH_IMAGE070
Is the torque produced by the electric actuator. It can be seen that by limiting the discharge at a given high voltage battery
Figure 996354DEST_PATH_IMAGE064
Then, the calculated maximum torque generated by each electric actuator
Figure DEST_PATH_IMAGE122
Most corresponding to the front and rear axes High total torque
Figure DEST_PATH_IMAGE124
。
On the basis of the above embodiments, optionally, obtaining the rotation speed limit value of the electronic supercharger and the torque limit value of the at least one electric machine according to the distribution coefficient includes: according to the distribution coefficient, constructing a power splitting matrix of the distribution coefficient, and acquiring the maximum power value of the electronic supercharger and the maximum power value of at least one motor; wherein the power splitting matrix is:
Figure DEST_PATH_IMAGE022A
Wherein,
Figure 598368DEST_PATH_IMAGE024
Is the maximum discharge power of the battery,
Figure 824950DEST_PATH_IMAGE026
Is the required power of the electronic supercharger,
Figure 597734DEST_PATH_IMAGE028
Is the required power of the second electrical machine,
Figure 607278DEST_PATH_IMAGE030
Is the power required by the first electric machine,
Figure 47486DEST_PATH_IMAGE032
Is the required power of the DC-DC module,
Figure 667473DEST_PATH_IMAGE034
Is the maximum power of the electronic supercharger,
Figure 130816DEST_PATH_IMAGE036
Is the maximum power of the second motor,
Figure 6368DEST_PATH_IMAGE038
Is the maximum power of the first motor,
Figure 35504DEST_PATH_IMAGE040
Is the maximum power of the DC-DC module. The power splitting matrix may also be referred to as a propulsion priority matrix, and is used to calculate the maximum electric power of each electric actuator, wherein the calculated electric power is the maximum electric power solved by the torque maximization matrix, that is, if the required power of a certain electric actuator is greater than the maximum power determined by the distribution coefficient, the electric power distributed to the electric actuator should be the maximum power according to the system limitation.
On the basis of the foregoing embodiments, optionally, after obtaining the maximum power value of the electronic supercharger and the maximum power value of the at least one electric motor according to the distribution coefficient, the method further includes: the rotational speed limit of the electronic supercharger and the torque limit of the at least one electric machine are determined as a function of the maximum power of the electronic supercharger and the maximum power of the at least one electric machine. Wherein, if the maximum inherent electric power of the component is smaller than the solved maximum electric power, the component is distributed according to the inherent electric power of the component.
Specifically, obtaining the rotation speed limit value of the electronic supercharger and the torque limit value of the at least one electric motor according to the maximum power value of the electronic supercharger and the maximum power value of the at least one electric motor comprises adopting the following formulas:
Figure DEST_PATH_IMAGE126
Wherein,
Figure DEST_PATH_IMAGE128
Is the limit value of the rotational speed of the electronic supercharger,
Figure DEST_PATH_IMAGE130
Is a function of the power-calculated speed of the electronic supercharger,
Figure 885779DEST_PATH_IMAGE016
Is the maximum value of the power of the electronic supercharger,
Figure DEST_PATH_IMAGE132
Is the torque limit value of the first electric machine,
Figure 164314DEST_PATH_IMAGE092
Is the efficiency of the first motor and is,
Figure 781240DEST_PATH_IMAGE094
Is the rotational speed of the first motor and,
Figure 681194DEST_PATH_IMAGE012
Is the maximum value of the power of the first motor,
Figure DEST_PATH_IMAGE134
Is the torque limit value of the second electric machine,
Figure 889321DEST_PATH_IMAGE100
Is the efficiency of the second electrical machine and,
Figure 123994DEST_PATH_IMAGE102
Is the rotational speed of the second motor and,
Figure 279032DEST_PATH_IMAGE084
Is the maximum value of the power of the second motor. Function of actual distributed power of electronic supercharger and actual rotating speed thereof
Figure 282760DEST_PATH_IMAGE130
Can be obtained by experiment, as shown in fig. 6.
Fig. 7 is a schematic flow chart of an electric power distribution method of another hybrid power system according to an embodiment of the invention. Referring to fig. 7, the electric power distribution method of the hybrid system includes the steps of:
S210, according to the rotating speed of the first motor
Figure 943679DEST_PATH_IMAGE094
The rotational speed of the second motor
Figure 603331DEST_PATH_IMAGE102
High voltage battery discharge limitation
Figure 358797DEST_PATH_IMAGE064
Front axle transmission ratio
Figure 217032DEST_PATH_IMAGE090
The transmission ratio between the second motor and the rear wheel
Figure 235803DEST_PATH_IMAGE098
And total torque required for front and rear axles
Figure 445068DEST_PATH_IMAGE120
And acquiring a distribution coefficient a and a distribution coefficient b through a maximum traction optimization algorithm.
null
Figure DEST_PATH_IMAGE002AA
Wherein i is less than or equal to m, j is less than or equal to n, and the calculation formula of each element in the torque maximization matrix is as follows:
Figure DEST_PATH_IMAGE136
Identifying a maximum value in the matrix
Figure 345503DEST_PATH_IMAGE080
Is indexed by
Figure 261506DEST_PATH_IMAGE082
And finding corresponding values of a and b to obtain the priority distribution of the electronic supercharger, the first motor and the second motor.
S220, performing work through the propulsion priority matrix according to the distribution coefficient a and the distribution coefficient b Rate distribution to obtain the maximum power of the electronic booster
Figure 733070DEST_PATH_IMAGE016
Maximum power of the first electric machine
Figure 429631DEST_PATH_IMAGE012
And maximum power of the second motor
Figure 730162DEST_PATH_IMAGE020
。
Wherein, the propulsion priority matrix can also be called as a power splitting matrix, and is expressed as:
Figure DEST_PATH_IMAGE022AA
S230, according to the maximum power value of the electronic booster
Figure 641617DEST_PATH_IMAGE016
Maximum power of the first electric machine
Figure 736612DEST_PATH_IMAGE012
And maximum power of the second motor
Figure 920469DEST_PATH_IMAGE020
The limit value of the rotation speed of the electronic supercharger is obtained through system limitation
Figure 821429DEST_PATH_IMAGE128
Torque limit value of the first electric machine
Figure 259495DEST_PATH_IMAGE132
And torque limit of the second electric machine
Figure 853287DEST_PATH_IMAGE134
。
The system limit is a limit value provided for a controller of the electronic supercharger, the first motor and the second motor, and can be specifically obtained by solving the following formula:
Figure DEST_PATH_IMAGE126A
According to the embodiment of the invention, the distribution coefficient for maximizing the torque can be calculated in real time through the steps, so that the optimal power distribution to the electronic supercharger, the first motor and the second motor is realized under the condition of limiting the power of the high-voltage battery, and the maximization of the traction torque and the optimal performance expression of a power system are realized.
The invention also provides an electric power distribution device of the hybrid power system, which can be integrated in a controller of a hybrid electric vehicle. Fig. 8 is a schematic structural diagram of an electric power distribution device of a hybrid power system according to an embodiment of the present invention. Referring to fig. 8, the electric power distribution apparatus includes: the pre-set distribution module 310, the total torque calculation module 320, the distribution coefficient acquisition module 330, and the limit acquisition module 340. The preset distribution module 310 is used for distributing the maximum discharge power of the high-voltage battery to the DC-DC module, the electronic supercharger and the at least one motor according to a preset distribution coefficient; the total torque calculation module 320 is used for calculating the total torque generated by the electronic supercharger and the at least one motor according to a preset distribution coefficient; the distribution coefficient obtaining module 330 is configured to obtain maximum total torques under different preset distribution coefficients and distribution coefficients corresponding to the maximum total torques; the limit acquisition module 340 is configured to obtain a speed limit of the electric supercharger and a torque limit of the at least one electric machine based on the distribution coefficient.
According to the embodiment of the invention, the preset distribution module 310, the total torque calculation module 320, the distribution coefficient acquisition module 330 and the limit value acquisition module 340 are arranged, so that the distribution coefficient for maximizing the torque can be calculated in real time, the optimal power distribution to the DC-DC module and each electric actuator under the condition of limiting the power of the high-voltage battery is realized, and the maximization of the traction torque and the optimal performance expression of a power system are realized.
The embodiment of the invention also provides a hybrid electric vehicle. The hybrid power system of the hybrid electric vehicle comprises an internal combustion engine, a high-voltage battery, a DC-DC module powered by the high-voltage battery, an electronic supercharger, at least one motor and a controller; the controller realizes the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
On the basis of the above embodiments, optionally, the at least one motor includes a first motor and a second motor; the first motor is mounted on a front axle of the hybrid electric vehicle, and the second motor is mounted on a rear axle of the hybrid electric vehicle. The electric supercharger, the first motor and the second motor constitute an electric actuator of the hybrid system for distributing electric power of the high-voltage battery.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. An electric power distribution method of a hybrid system, characterized in that the hybrid system includes an internal combustion engine, a high-voltage battery, and a DC-DC module, an electronic supercharger, and at least one electric machine that are powered by the high-voltage battery;
The electric power distribution method includes:
Distributing the maximum discharge power of the high-voltage battery to the DC-DC module, the electronic supercharger and the at least one motor at a preset distribution coefficient;
Calculating the total torque generated by the electronic supercharger and the at least one motor according to the preset distribution coefficient;
Acquiring maximum total torque under different preset distribution coefficients and a distribution coefficient corresponding to the maximum total torque;
And obtaining a rotating speed limit value of the electronic supercharger and a torque limit value of the at least one motor according to the distribution coefficient.
2. The method of claim 1, wherein distributing the maximum discharge power of the high voltage battery to the DC-DC module, the electronic supercharger, and the at least one electric machine at a preset distribution coefficient comprises:
The maximum discharge power of the high-voltage battery comprises power and torque power required by the DC-DC module; wherein the power required by the electronic supercharger and the at least one electric machine is divided by the torque power.
3. The method of claim 2, wherein the at least one motor comprises a first motor and a second motor;
null
4. The method of claim 3, wherein said calculating a total torque produced by said electronic supercharger and said at least one electric machine based on said preset partition coefficient comprises:
The values of the distribution coefficients a comprise m, and the values of the distribution coefficients b comprise n;
Constructing a torque maximization matrix with dimension m x n as:
Figure DEST_PATH_IMAGE002
Wherein i is less than or equal to m, and j is less than or equal to n;
And identifying the maximum value in the torque maximization matrix, and correspondingly finding out the value of the distribution coefficient a and the value of the distribution coefficient b.
5. The method of claim 4, wherein the method is performed in a batch process The above-mentioned
Figure DEST_PATH_IMAGE004
The calculation of (a) includes:
Figure DEST_PATH_IMAGE006
Wherein,
Figure DEST_PATH_IMAGE008
Is the power of the torque to be transmitted,
Figure DEST_PATH_IMAGE010
Is the torque coefficient of the first electrical machine,
Figure DEST_PATH_IMAGE012
Is the power limit of the first motor,
Figure DEST_PATH_IMAGE014
Is a function of the power-calculated torque of the electronic supercharger,
Figure DEST_PATH_IMAGE016
Is the power limit of the electronic supercharger,
Figure DEST_PATH_IMAGE018
Is the torque coefficient of the second electrical machine,
Figure DEST_PATH_IMAGE020
Is the power limit of the second motor.
6. The method of claim 3, wherein said deriving a speed limit of the electronic supercharger and a torque limit of the at least one electric machine based on the division factor comprises:
According to the distribution coefficient, a power splitting matrix of the distribution coefficient is constructed, and the maximum power value of the electronic supercharger and the maximum power value of the at least one motor are obtained; wherein the power splitting matrix is:
Figure DEST_PATH_IMAGE022
Wherein,
Figure DEST_PATH_IMAGE024
Is the maximum discharge power of the battery,
Figure DEST_PATH_IMAGE026
Is the required power of the electronic supercharger,
Figure DEST_PATH_IMAGE028
Is the required power of the second electrical machine,
Figure DEST_PATH_IMAGE030
Is the power required by the first electric machine,
Figure DEST_PATH_IMAGE032
Is the required power of the DC-DC module,
Figure DEST_PATH_IMAGE034
Is the maximum power of the electronic supercharger,
Figure DEST_PATH_IMAGE036
Is the maximum power of the second motor,
Figure DEST_PATH_IMAGE038
Is the maximum power of the first motor,
Figure DEST_PATH_IMAGE040
Is the maximum power of the DC-DC module.
7. The method of claim 6, further comprising, after obtaining the maximum power value for the electronic supercharger and the maximum power value for the at least one electric machine based on the division factor:
And obtaining a rotating speed limit value of the electronic supercharger and a torque limit value of the at least one electric machine according to the maximum power value of the electronic supercharger and the maximum power value of the at least one electric machine.
8. An electric power distribution apparatus of a hybrid system, characterized in that the hybrid system includes an internal combustion engine, a high-voltage battery, and a DC-DC module, an electronic supercharger, and at least one electric machine that are powered by the high-voltage battery;
The electric power distribution device includes:
The preset distribution module is used for distributing the maximum discharge power of the high-voltage battery to the DC-DC module, the electronic supercharger and the at least one motor according to a preset distribution coefficient;
The total torque calculation module is used for calculating the total torque generated by the electronic supercharger and the at least one motor according to the preset distribution coefficient;
The distribution coefficient acquisition module is used for acquiring maximum total torque under different preset distribution coefficients and the distribution coefficient corresponding to the maximum total torque;
And the limit value acquisition module is used for obtaining a rotating speed limit value of the electronic supercharger and a torque limit value of the at least one motor according to the distribution coefficient.
9. A hybrid vehicle, characterized in that the hybrid system comprises an internal combustion engine, a high voltage battery, and a DC-DC module, an electronic supercharger, at least one electric machine and a controller, which are powered by the high voltage battery;
Wherein the controller implements the method of any of claims 1-7.
10. The hybrid vehicle of claim 9, wherein the at least one electric machine includes a first electric machine and a second electric machine; the first motor is mounted on a front shaft of the hybrid electric vehicle, and the second motor is mounted on a rear shaft of the hybrid electric vehicle.
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