CN113733977B - Battery throughput control method for hybrid power system, hybrid power system and automobile - Google Patents

Battery throughput control method for hybrid power system, hybrid power system and automobile Download PDF

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Publication number
CN113733977B
CN113733977B CN202111127743.1A CN202111127743A CN113733977B CN 113733977 B CN113733977 B CN 113733977B CN 202111127743 A CN202111127743 A CN 202111127743A CN 113733977 B CN113733977 B CN 113733977B
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power
battery
gear
hybrid
engine
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CN113733977A (en
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胡金蕊
庄晓
陈永瑞
王勤猛
刘涛
史涛
高鑫宇
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FAW Jiefang Automotive Co Ltd
FAW Jiefang Qingdao Automobile Co Ltd
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FAW Jiefang Automotive Co Ltd
FAW Jiefang Qingdao Automobile 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/24—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/36—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
    • B60K6/365—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings with the gears having orbital motion
    • 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
    • B60L2240/44—Drive Train control parameters related to combustion engines
    • 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
    • B60L2240/54—Drive Train control parameters related to 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
    • Y02T10/62—Hybrid vehicles
    • 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

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

Abstract

The invention belongs to the technical field of vehicles, and discloses a battery throughput control method of a hybrid power system, the hybrid power system and an automobile. The battery throughput control method of the hybrid power system comprises the following steps: using driver demand power P dem And the actual power P of the engine cur Calculating the compensation power P of the power battery bat The method comprises the steps of carrying out a first treatment on the surface of the According to the compensation power P of the power battery bat And the voltage U of the power battery, calculate the target current I of the power battery dem The method comprises the steps of carrying out a first treatment on the surface of the According to the current bus current I of the power battery cur And target current I of power battery dem Calculating the current offset I of the power battery Δ The method comprises the steps of carrying out a first treatment on the surface of the According to the proportionality coefficient K p Integral coefficient K i Calculating battery regulating power P adj The method comprises the steps of carrying out a first treatment on the surface of the According to engine power P e Engine speed n e First gear ring rotational speed n 2 And planet row characteristic coefficient k, calculating first sun gear split power P s The method comprises the steps of carrying out a first treatment on the surface of the Compensating power P using a power cell bat Battery regulated power P adj First sun gear split power P of generator s Obtaining the output power P of the driving motor 2 To control power battery throughput.

Description

Battery throughput control method for hybrid power system, hybrid power system and automobile
Technical Field
The invention relates to the technical field of vehicles, in particular to a battery throughput control method of a hybrid power system, the hybrid power system and an automobile.
Background
The hybrid electric vehicle is used as a transition of the traditional fuel oil vehicle and the pure electric vehicle, and is protruding from the foreign military, so that the hybrid electric vehicle becomes a research hot spot. The power system of the hybrid electric vehicle consists of a plurality of power sources, and through reasonable transmission system structural design and energy management strategies, the reasonable distribution of the required power among the power sources and the coordination control among the power system components can be realized, and the economy of the whole vehicle is improved on the premise of ensuring the power performance.
The existing hybrid electric vehicles are specifically divided into serial connection type, parallel connection type, serial-parallel connection type, plug-in type and the like, and the performance of a power battery is important in any mode. The throughput of the power battery, as the name implies, refers to the amount of power successfully delivered per unit time, and specifically includes the input power and the output power of the power battery.
The prior hybrid power battery has the following research directions, firstly, a degradation model of the power battery is provided, and the purpose of delaying the service life of the power battery is achieved by minimizing the fuel consumption of the battery; second, a model of power cell capacity fade is presented and the optimal configuration of the drive train is solved based on other optimal objectives. Neither way mentions an efficient control of the throughput of the power battery, which directly affects the service life of the power battery if the hybrid vehicle is in steady state.
Disclosure of Invention
The invention aims to provide a battery throughput control method of a hybrid power system, the hybrid power system and an automobile, which are used for effectively controlling the battery throughput so as to prolong the service life of the battery.
To achieve the purpose, the invention adopts the following technical scheme:
the battery throughput control method of the hybrid power system is used for controlling the throughput of a power battery in the hybrid power system, and comprises the following steps of:
s1, utilizing the driver demand power P dem And the actual power P of the engine cur Calculating the compensation power P of the power battery bat Wherein P is bat ＝P dem -P cur ；
S2, compensating power P according to the power battery bat And the voltage U of the power battery, calculate the target current I of the power battery dem Wherein, the method comprises the steps of, wherein,
Figure BDA0003279237630000021
s3, according to the current bus current I of the power battery cur And target current I of power battery dem Calculating the current offset I of the power battery Δ Wherein I Δ ＝I cur -I dem ；
S4, according to the proportionality coefficient K p Integral coefficient K i Calculating battery regulating power P adj Wherein P is adj ＝K p ×I Δ +∑K i ×I Δ ；
S5, according to the engine power P e Engine speed n e First gear ring rotational speed n 2 And a planet row characteristic coefficient k, calculating a first sun gear split power P of the generator s Wherein, the method comprises the steps of, wherein,
Figure BDA0003279237630000022
s6, compensating power P by using power battery bat Battery regulated power P adj First sun gear split power P of generator s Obtaining the output power P of the driving motor 2 Wherein P is 2 ＝P bat +P s -P adj 。
Preferably, the compensation power P of the power battery is calculated bat And battery regulating power P adj Before, step S0 is further included, and it is determined whether the power battery throughput adjustment mode needs to be started.
Preferably, if the speed of the whole vehicle is greater than a first preset speed, the execution gear of the whole vehicle is in a D gear, the engine is in a power output state, and a power battery throughput adjustment mode is started.
Preferably, if the speed of the whole vehicle is smaller than a second preset speed, or the execution gear of the whole vehicle is in a non-D gear, or the engine is in a non-power output state, the power battery throughput adjustment mode is reset, wherein the second preset speed is smaller than the first preset speed.
Preferably, the planet row characteristic coefficient k satisfies the following formula, k=z 2 /Z 1 Wherein Z is 2 For the number of teeth of the first gear ring, Z 1 Is the number of teeth of the first sun gear.
In order to achieve the above object, the present invention further provides a hybrid power system, which is controlled by the above method for controlling throughput of a battery of a hybrid power system, the hybrid power system comprising:
the device comprises an engine, a first planet carrier and first planet gears, wherein the output end of the engine is connected with the first planet carrier, and the first planet gears are rotatably arranged on the first planet carrier;
the output end of the generator is connected to the first sun gear, and the first sun gear is positioned in the first planet carrier and meshed with the first planet gears;
the output end of the driving motor is connected to the first gear ring, and the first gear ring is sleeved outside the first planet carrier and meshed with the first planet gears;
and the output shaft is connected with the first gear ring.
Preferably, the hybrid system further includes:
the second sun gear is connected with the output end of the driving motor;
the second planet carrier is rotatably provided with the second planet wheels, the second planet wheels are meshed with the second sun wheel, and the output shaft penetrates through the second sun wheel and the second planet carrier respectively;
the second gear ring is sleeved outside the second planet carrier and meshed with the second planet gears.
Preferably, the hybrid system further includes a main reduction gear assembly disposed at an end of the output shaft remote from the first ring gear and connected to a differential.
Preferably, a center hole is provided in the first carrier, and the first sun gear is provided in the center hole.
In order to achieve the above purpose, the invention also provides an automobile comprising the hybrid power system.
The invention has the beneficial effects that:
the invention provides a battery throughput control method of a hybrid power system, wherein the first sun gear shunts power P s Specifically representing the output power of the generator, the output power of the driving motor is P 2 In order to achieve an efficient control of the power battery throughput, the output power P of the generator is theoretically required s And the output power of the driving motor is P 2 Equal, however, when the driver demands power P dem And the actual power P of the engine cur There is a difference in the driver demand power P dem Specifically, the target power of the engine needs to be compensated by the power battery, so that the compensation power P of the power battery bat At the same time receive the driver demand power P dem And the actual power P of the engine cur To stabilize the operating point of the engine, the actual power P of the engine cur The output lags behind the engine target power.
In addition, the split power of the sun gear deviates from the actual power due to rotational speed and torque errors of the drive motor and the generator. The invention first calculates the actual power P of the engine cur A difference between the target power and the target power, thereby obtaining a target current I of the power battery dem Current bus current I of power battery cur Representing the actual electric quantity of the power battery, calculating the adjusting power for adjusting the throughput by using a PI controller according to the difference between the actual electric quantity of the power battery and the target current, and finally switching onThe overdrive motor is used for realizing the adjustment of the output power of the power battery, thereby reducing useless throughput of the power battery caused by errors of rotating speed and torque and prolonging the service life of the power battery.
The hybrid power system provided by the invention has a planetary gear type structure, and adopts three power sources of an engine, a generator and a driving motor to jointly determine the power output of an output shaft. The first planet carrier, the first planet gears, the first sun gear and the first gear ring jointly form a transmission mechanism, and through reasonably arranging the transmission mechanism, the reasonable distribution of the required power among various power sources can be realized, and the economy of the whole vehicle is improved on the premise of ensuring the power performance.
The automobile provided by the invention comprises a hybrid power system, can effectively control the throughput of a battery, and has good fatigue resistance.
Drawings
FIG. 1 is a schematic diagram of a hybrid powertrain provided by the present invention;
fig. 2 is a flowchart of a method for controlling throughput of a battery of a hybrid system according to the present invention.
In the figure:
1. an engine; 2. a first planet carrier; 3. a first planet; 4. a first sun gear; 5. a first ring gear; 6. an output shaft; 7. a second sun gear; 8. a second carrier; 9. a second planet wheel; 10. a second ring gear; 11. a main reduction gear assembly.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
The embodiment provides an automobile, in particular a hybrid electric automobile, which comprises a hybrid power system, can effectively control the throughput of a battery, and has good fatigue resistance.
The embodiment provides a hybrid power system, in particular to a series-parallel connection type and planetary hybrid power system, which is suitable for the technical field of hybrid power automobiles. As shown in fig. 1, the hybrid system includes an engine 1, a first planet carrier 2, a first planet wheel 3, a generator (not shown in the figure), a first sun gear 4, a driving motor (not shown in the figure), a first ring gear 5, and an output shaft 6, wherein an output end of the engine 1 is connected to the first planet carrier 2, the first planet carrier 2 may specifically be a ring, a triangle structure, or the like, the first planet carrier 2 is a structure symmetrical with respect to the center thereof, and the first planet carrier 2 is provided with the first planet wheel 3 through rotation of a rotating shaft. The output end of the generator is connected to the first sun gear 4, the first sun gear 4 is located in a central hole of the first planet carrier 2, the central hole is used for accommodating the first sun gear 4, and the first sun gear 4 is meshed with the first planet gears 3. The output end of the driving motor is connected to the first gear ring 5, the first gear ring 5 is not fixedly arranged, the driving motor can drive the first gear ring 5 to rotate, the first gear ring 5 is sleeved outside the first planet carrier 2 and meshed with the first planet gears 3, the first gear ring 5 is connected to the output shaft 6, and the output shaft 6 is used for power output.
The hybrid power system is of a planetary gear type structure, and adopts three power sources of an engine 1, a generator and a driving motor to jointly determine the power output of an output shaft 6. The first planet carrier 2, the first planet gears 3, the first sun gear 4 and the first gear ring 5 form a transmission mechanism together, and through reasonably arranging the transmission mechanism, the reasonable distribution of the required power among various power sources can be realized, and the economy of the whole vehicle is improved on the premise of ensuring the power performance.
It will be appreciated that the output of the drive motor may be directly connected to the first ring gear 5, and that the drive motor may also be indirectly connected to the first ring gear 5 via a planetary arrangement. Specifically, the hybrid power system further comprises a second sun gear 7, a second planet carrier 8, a second planet wheel 9 and a second gear ring 10, the output end of the driving motor is connected to the second sun gear 7, a mounting hole is formed in the center of the second planet carrier 8 and used for providing a mounting space for the second sun gear 7, the second planet wheel 9 is rotatably arranged on the second planet carrier 8 through a pin shaft, the second planet wheel 9 is meshed with the second sun gear 7, and the output shaft 6 penetrates through the second sun gear 7 and the second planet carrier 8 respectively. A second gear ring 10 is sleeved outside the second planet carrier 8, and the second gear ring 10 is fixedly arranged and meshed with the second planet gears 9.
In this part of the structure, the driving motor drives the second sun gear 7 to rotate, and the driving motor is an active input part, and drives the second planet gear 9 to rotate along with the rotation of the second sun gear 7. Since the second gear ring 10 is fixedly arranged, the second planet carrier 8 is a driven output part, and the second planet carrier 8 is connected to the first gear ring 5 through the output shaft 6, so that the indirect connection between the driving motor and the first gear ring 5 is realized.
In order to ensure that the power output by the output shaft 6 can be distributed to each wheel so as to complete the normal running of the whole vehicle, the hybrid power system further comprises a main reduction gear assembly 11, wherein the main reduction gear assembly 11 is arranged at one end of the output shaft 6 far away from the first gear ring 5, and the main reduction gear assembly 11 plays a role in reducing the rotating speed of the output shaft 6. The main reduction gear assembly 11 distributes output power to the respective wheels through a differential.
Because the generator is a component with a power generation function, and the driving motor is a component with a discharging function, it can be understood that in an ideal state, if all the generated and stored electric energy of the generator can be just used for the electric energy consumption of the driving motor, the balance of electric energy balance is realized, at the moment, the power battery does not use electric energy input or electric energy output, i.e. the power battery does not carry out the charging and discharging processes of current, the throughput of the power battery is approximately zero, and in this case, the service life of the power battery is longer.
For this reason, the present embodiment further provides a method for controlling throughput of a battery of a hybrid power system, which is used for controlling throughput of a power battery of the hybrid power system, as shown in fig. 2, and includes the following steps:
s1, utilizing the driver demand power P dem And the actual power P of the engine 1 cur Calculating the compensation power P of the power battery bat Wherein P is bat ＝P dem -P cur ；
S2, compensating power P according to the power battery bat And the voltage U of the power battery, calculate the target current I of the power battery dem Wherein, the method comprises the steps of, wherein,
Figure BDA0003279237630000081
s3, according to the current bus current I of the power battery cur And target current I of power battery dem Calculating the current offset I of the power battery Δ Wherein I Δ ＝I cur -I dem ；
S4, according to the proportionality coefficient K p Integral coefficient K i Calculating battery regulated powerP adj Wherein P is adj ＝K p ×I Δ +∑K i ×I Δ ；
S5, according to the engine power P e Engine speed n e First gear ring rotational speed n 2 And a planet row characteristic coefficient k, calculating a first sun gear split power P of the generator s Wherein, the method comprises the steps of, wherein,
Figure BDA0003279237630000082
s6, compensating power P by using power battery bat Battery regulated power P adj First sun gear split power P of generator s Obtaining the output power P of the driving motor 2 Wherein P is 2 ＝P bat +P s -P adj 。
In the battery throughput control method for the hybrid power system provided by the embodiment, the first sun gear shunts the power P s Specifically representing the output power of the generator, the output power of the driving motor is P 2 In order to achieve an efficient control of the power battery throughput, the output power P of the generator is theoretically required s And the output power of the driving motor is P 2 Equal, however, when the driver demands power P dem And the actual power P of the engine 1 cur There is a difference in the driver demand power P dem Specifically, the target power of the engine needs to be compensated by the power battery, so that the compensation power P of the power battery bat At the same time receive the driver demand power P dem And the actual power P of the engine 1 cur To stabilize the operating point of the engine 1, the actual power P of the engine 1 cur The output lags behind the engine target power.
In addition, the split power of the sun gear deviates from the actual power due to rotational speed and torque errors of the drive motor and the generator. The present invention first calculates the actual power P of the engine 1 cur A difference between the target power and the target power, thereby obtaining a target current I of the power battery dem Current bus current I of power battery cur Representing the actual charge of the power cellAccording to the difference between the actual electric quantity and the target current of the power battery, the PI controller is utilized to calculate the adjusting power for adjusting the throughput, and finally the output power of the power battery is adjusted by driving the motor, so that the useless throughput of the power battery caused by the rotating speed and torque errors is reduced, and the service life of the power battery is prolonged.
Further, as shown in fig. 2, the compensation power P of the power battery is calculated bat And battery regulating power P adj Before, step S0 is further included, and it is determined whether the power battery throughput adjustment mode needs to be started. It can be understood that if the whole vehicle is not in a steady state, the power battery is required to input and output electric energy, so that the energy conservation is ensured, and meanwhile, the good power performance is ensured. If the whole vehicle is in a steady state, the accelerator is kept fixed, the output power of the engine 1 is kept unchanged, and in the state, the power battery does not need to be charged and discharged.
Specifically, if the vehicle speed of the whole vehicle is greater than the first preset speed, the execution gear of the whole vehicle is in the D gear, the engine 1 is in the power output state, and the power battery throughput adjustment mode is started. In other words, the execution gear of the whole vehicle is in the D gear, which means that the whole vehicle is in a forward state, if the whole vehicle speed is relatively high, and the engine 1 is in a power output state, it is determined that the whole vehicle is in a steady state, and the power battery does not need to be charged and discharged, so that the power battery throughput adjustment mode is started, and the battery throughput function is adjusted.
If the speed of the whole vehicle is smaller than a second preset speed, or the execution gear of the whole vehicle is in a non-D gear, or the engine 1 is in a non-power output state, resetting the power battery throughput adjustment mode, wherein the second preset speed is smaller than the first preset speed. In other words, the execution gear of the whole vehicle is in the non-D gear, which means that the whole vehicle is not in the forward state, if the whole vehicle speed is relatively small and the engine 1 is in the non-power output state, it is determined that the whole vehicle is not in the steady state, and the process of charging and discharging the power battery is required at this time, so that the power battery throughput adjustment mode is not started, and the power battery throughput adjustment function is reset.
Further, the planet row characteristic coefficient k satisfies the following formula, k=z 2 /Z 1 Wherein Z is 2 For the number of teeth, Z, of the first ring gear 5 1 Is the number of teeth of the first sun gear 4. By setting the characteristic coefficient k of the planet row, a characteristic equation of the motion of the planetary gear mechanism can be obtained, so that the first sun gear split power P of the generator is obtained s And engine power P e Correspondence between them.
The battery throughput control method of the hybrid power system provided by the embodiment comprises the following steps:
s0, judging whether a power battery throughput adjustment mode needs to be started, if so, executing S01 or S02, and if not, executing an end command;
s01, if the speed of the whole vehicle is greater than a first preset speed V1=25 km/h, an execution gear of the whole vehicle is in a D gear, the engine 1 is in a power output state, and a power battery throughput adjustment mode is started;
s02, resetting the power battery throughput adjustment mode if the speed of the whole vehicle is smaller than a second preset speed V2 = 15km/h, or the execution gear of the whole vehicle is in a non-D gear, or the engine 1 is in a non-power output state;
s1, utilizing the driver demand power P dem =20 kw and the actual power P of the engine 1 cur =14 kw, calculating the compensation power P of the power battery bat Wherein P is bat ＝P dem -P cur ＝20kw-14kw＝6kw；
S2, compensating power P of the power battery bat =6kw and voltage of the power cell u=360 v, the target current I of the power cell is calculated dem Wherein, the method comprises the steps of, wherein,
Figure BDA0003279237630000101
s3, current bus current I of the power battery cur Target current I of power battery and =19a dem =16.7a, calculate the current offset I of the power cell Δ Wherein I Δ ＝I cur -I dem ＝19A-16.7A＝2.3A；
S4, according to the proportionality coefficient K p =0.1 kw/a, integral coefficient K i =0.03 kw/a·s, and the battery conditioning power P is calculated adj Wherein P is adj ＝K p ×I Δ +∑K i ×I Δ ＝0.1kw/A×2.3A+0.03kw/A·2.3A＝0.299kw；
S5, according to the engine power P e =40 kw, engine speed n e =1500 rpm, first ring gear speed n 2 Calculating the first sun gear split power P of the generator by using 2500rpm and the planet row characteristic coefficient k=2.1 s Wherein, the method comprises the steps of, wherein,
Figure BDA0003279237630000102
s6, compensating power P by using power battery bat Battery regulated power P adj First sun gear split power P of generator s Obtaining the output power P of the driving motor 2 Wherein P is 2 ＝P bat +P s -P adj ＝6kw-5.16kw-0.299kw＝0.541kw。
In the description herein, it should be understood that the terms "upper," "lower," "right," and the like are used for convenience in description and simplicity of operation only, and are not to be construed as limiting the invention, as the devices or elements referred to must have, be constructed or operated in a particular orientation. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.
In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
Furthermore, the foregoing description of the preferred embodiments and the principles of the invention is provided herein. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (9)

1. The hybrid power system is characterized in that the control is performed by adopting a battery throughput control method of the hybrid power system, and the hybrid power system comprises:
the device comprises an engine (1), a first planet carrier (2) and first planet gears (3), wherein the output end of the engine (1) is connected to the first planet carrier (2), and the first planet gears (3) are rotatably arranged on the first planet carrier (2);
the output end of the generator is connected to the first sun gear (4), and the first sun gear (4) is positioned inside the first planet carrier (2) and meshed with the first planet gears (3);
the driving motor and the first gear ring (5), the output end of the driving motor is connected to the first gear ring (5), and the first gear ring (5) is sleeved outside the first planet carrier (2) and meshed with the first planet gears (3);
an output shaft (6) connected to the first ring gear (5);
the battery throughput control method of the hybrid power system is used for controlling the throughput of the power battery in the hybrid power system, and comprises the following steps of:
s1, utilizing the driver demand power P dem And the actual power P of the engine (1) cur Calculating the compensation power P of the power battery bat Wherein P is bat ＝P dem -P cur ；
S2, compensating power P according to the power battery bat And power cell electricityPressure U, calculating target current I of power battery dem Wherein, the method comprises the steps of, wherein,
Figure QLYQS_1
s3, according to the current bus current I of the power battery cur And target current I of power battery dem Calculating the current offset I of the power battery Δ Wherein I Δ ＝I cur -I dem ；
S4, according to the proportionality coefficient K p Integral coefficient K i Calculating battery regulating power P adj Wherein P is adj ＝K p ×I Δ +∑K i ×I Δ ；
S5, according to the engine power P e Engine speed n e First gear ring rotational speed n 2 And a planet row characteristic coefficient k, calculating a first sun gear split power P of the generator s Wherein, the method comprises the steps of, wherein,
Figure QLYQS_2
s6, compensating power P by using power battery bat Battery regulated power P adj First sun gear split power P of generator s Obtaining the output power P of the driving motor 2 Wherein P is 2 ＝P bat +P s -P adj 。
2. The hybrid system of claim 1, wherein the power P is compensated for in the power cell calculation bat And battery regulating power P adj Before, step S0 is further included, and it is determined whether the power battery throughput adjustment mode needs to be started.
3. The hybrid system according to claim 2, wherein if the vehicle speed of the whole vehicle is greater than a first preset speed, and the execution gear of the whole vehicle is in D-gear, and the engine (1) is in a power output state, the power battery throughput adjustment mode is started.
4. A hybrid powertrain according to claim 3, wherein the power cell throughput adjustment mode is reset if the vehicle speed of the whole vehicle is less than a second preset speed, or the execution gear of the whole vehicle is in a non-D gear, or the engine (1) is in a non-power output state, wherein the second preset speed is less than the first preset speed.
5. The hybrid system of claim 1, wherein the planet row characteristic coefficient k satisfies the following equation, k=z 2 /Z 1 Wherein Z is 2 For the number of teeth, Z, of the first gear ring (5) 1 Is the number of teeth of the first sun gear (4).
6. The hybrid system of claim 1, further comprising:
the second sun gear (7) is connected to the output end of the driving motor;
the second planet carrier (8) and the second planet wheel (9) are rotatably arranged on the second planet carrier (8), the second planet wheel (9) is meshed with the second sun wheel (7), and the output shaft (6) is respectively arranged on the second sun wheel (7) and the second planet carrier (8) in a penetrating mode;
the second gear ring (10) is sleeved outside the second planet carrier (8) and meshed with the second planet gears (9).
7. A hybrid system according to claim 6, further comprising a main reduction gear assembly (11), the main reduction gear assembly (11) being arranged at an end of the output shaft (6) remote from the first ring gear (5) and being connected to a differential.
8. Hybrid system according to claim 1, characterized in that a central bore is provided in the first planet carrier (2), in which central bore the first sun wheel (4) is arranged.
9. An automobile comprising the hybrid system of any one of claims 1-8.
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