CN110758178B - Method for switching effective discharge power during running of new energy automobile - Google Patents
Method for switching effective discharge power during running of new energy automobile Download PDFInfo
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- CN110758178B CN110758178B CN201910904587.1A CN201910904587A CN110758178B CN 110758178 B CN110758178 B CN 110758178B CN 201910904587 A CN201910904587 A CN 201910904587A CN 110758178 B CN110758178 B CN 110758178B
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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]
- B60L58/14—Preventing excessive discharging
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention provides a newThe invention relates to an effective discharge power switching method for energy automobile running, which judges the actual discharge power P under the condition that a monomer is not subjected to undervoltage by setting the warning discharge powerActiveWhether the discharge power exceeds the warning discharge power PwarningAccording to a preset time t1，t2，t3If the single body under-voltage occurs, the effective discharge power P is switched according to the slope S4outDown to 60S power P60sThe VCU only needs to determine the available maximum discharge power according to the BMS effective discharge power, and meanwhile, the power change speed in the switching process is controlled according to different discharge states, so that the process controllable target is achieved.
Description
Technical Field
The invention relates to the field of new energy automobile battery management, in particular to a new energy automobile running effective discharge power switching method.
Background
In BMS control of new energy automobiles in the existing products, effective discharge power is not calculated. The existing product directly calculates two values of the allowable discharge current in the battery 10S and the allowable discharge current in the battery 60S, the two values are respectively multiplied by the current total battery pressure to respectively obtain the allowable discharge power of 10S and the allowable discharge power of 60S, and then the two signals are sent to the VCU, so that the VCU can select the effective discharge power.
However, the prior art has the following disadvantages: 1. the complexity of VCU control is increased; 2. when the discharging power switching is performed, the BMS cannot control the power change rate for the current state as from 10S power to 60S power.
Disclosure of Invention
In order to solve the technical problems, the invention provides a new energy automobile driving effective discharge power switching method, which is used for calculating effective discharge power in a BMS, and meanwhile, different power change rate definitions are carried out aiming at power switching under different working conditions so as to control power switching change under different states.
According to an embodiment of the invention, the invention provides a new energy automobile running effective discharge power switching method, which comprises the following steps,
step one, acquiring the current actual discharge power P of the battery system in real time through a BMSActiveBMS sends out effective discharge power P to VCUoutWarning discharge power Pwarning10s discharge power P10s60s discharge power P60s；
Step two, when no single under-voltage fault occurs, the actual discharge power P is judgedActiveWhether the discharge power exceeds the warning discharge power PwarningIf not, the effective discharge power switching is realized based on a first preset rule, and if the actual discharge power P is not exceededActiveExceeding the warning discharge power PwarningThen, effective discharge power switching is realized based on a second preset rule;
step three, when a single under-voltage fault exists, 60s discharge power P is adopted60sAs a target, if PoutPower P higher than 60s60sImmediately, the effective discharge power P is obtained according to the slope S4outDown to 60S power P60sTo achieve efficient power switching.
Preferably, the 10s discharge power P10s60s discharge power P60sRespectively representing the discharge power at 10 seconds and 60 seconds, where P10sRepresentation BMSDischarging power in later 10s to maintain maximum power output, P60sWhich indicates the maximum power of the discharge power maintenance output of the BMS for the next 60 s.
Preferably, the effective discharge power PoutExpressed as the maximum discharge power allowed by the current BMS.
Preferably, the first preset rule is that when the actual discharge power P isActivePower P greater than 60s60sAnd continues for t1After time, the effective discharge power PoutDecrease to 60S power P according to slope S160sWhen the actual discharge power PActivePower P less than or equal to 60s60sAnd continues for t2After time, the effective discharge power PoutRising to 10S power P according to slope S210s。
Preferably, said t is1Is 10s, the t2Is 5 s.
Preferably, the S1 is 7KWH/S, and the S2 is 10 KWH/S.
Preferably, the second preset rule is that a time threshold t is set3When P isActiveGreater than PwarningAnd continues for t3After time, the effective discharge power PoutDecreasing to 60S power P according to S3 slope60s。
Preferably, said time t3Is 5 s.
Preferably, the S3 is 12 KWH/S.
Preferably, the S4 is 20 KWH/S.
The invention has the following beneficial effects:
the VCU only needs to decide the available maximum discharge power according to the BMS effective discharge power.
2. And controlling the power change speed in the switching process according to different discharge states to achieve the aim of process control.
Drawings
Fig. 1 is a diagram of an embodiment of a new energy vehicle driving effective discharge power switching method according to the present invention;
fig. 2 is a diagram illustrating another embodiment of the method for switching the effective discharge power during the driving of the new energy vehicle according to the present invention;
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a new energy vehicle driving effective discharge power switching method according to an embodiment of the present invention with reference to the drawings.
According to the purpose of the invention, the embodiment of the invention provides a flow chart of a new energy automobile running effective discharge power switching method, which mainly comprises the following steps:
step one, acquiring the current actual discharge power P of the battery system in real time through a BMSActiveBMS sends out effective discharge power P to VCUoutWarning discharge power Pwarning10s discharge power P10s60s discharge power P60s。
According to the object of the invention, a warning discharge power P is setwarningAnd 10s discharge power P10s60s discharge power P60sBy comparing the actual discharge power PActiveAnd a warning discharge power PwarningThe effective discharge power is switched according to the relation (2).
As a prior art solution, 10s discharge power P10s60s discharge power P60sRespectively representing the discharge power at 10 seconds and 60 seconds, where P10sRepresents the maximum power, P, of the discharge power maintenance output of the BMS within 10s later60sRepresents the maximum power of the discharge energy maintaining output in 60s later, the effective discharge power PoutExpressed as the maximum discharge power allowed by the current BMS.
Step two, when no single under-voltage fault occurs, the actual discharge power P is judgedActiveWhether the discharge power exceeds the warning discharge power PwarningIf the current does not exceed the preset value, the effective discharge function is realized based on a first preset ruleRate switching if the actual discharge power PActiveExceeding the warning discharge power PwarningThen, the effective discharge power switching is realized based on a second preset rule.
According to an embodiment of the present invention, as shown in FIG. 1, the first predetermined rule is when the actual discharge power P isActivePower P greater than 60s60sAnd continues for t1After time, the effective discharge power PoutDecrease to 60S power P according to slope S160sWhen the actual discharge power PActivePower P less than or equal to 60s60sAnd continues for t2After time, the effective discharge power PoutRising to 10S power P according to slope S210s. Wherein, t is1Is 10s, the t2The S1 is 7KWH/S, and the S2 is 10KWH/S for 5S.
According to an embodiment of the present invention, as shown in fig. 2, in the present invention, the second predetermined rule is to set a time threshold t3When P isActiveGreater than PwarningAnd continues for t3After time, the effective discharge power PoutDecreasing to 60S power P according to S3 slope60s. Wherein the time t3The S3 is 12KWH/S for 5S.
Step three, when a single under-voltage fault exists, 60s discharge power P is adopted60sAs a target, if PoutPower P higher than 60s60sImmediately, the effective discharge power P is obtained according to the slope S4outDown to 60S power P60sTo achieve efficient power switching. Wherein the S4 is 20 KWH/S.
The invention judges the actual discharge power P under the condition that the monomer is not in an undervoltage state by setting the warning discharge powerActiveWhether the discharge power exceeds the warning discharge power PwarningAccording to a preset time t1，t2，t3If the single body under-voltage occurs, the effective discharge power P is switched according to the slope S4outDown to 60S power P60sTherefore, the effective power switching is realized, and the VCU only needs to carry out the effective discharge power switching according to the BMS through the effective discharge power switching methodAnd determining the available maximum discharge power, and controlling the power change speed in the switching process according to different discharge states to achieve the process controllable target.
It will be evident to those skilled in the art that the embodiments of the present invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention are capable of being embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, apparatus or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting, and although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A new energy automobile driving effective discharge power switching method is characterized by comprising the following steps:
step one, acquiring the current actual discharge power P of the battery system in real time through a BMSActiveBMS sends out effective discharge power P to VCUoutWarning discharge power Pwarning10s discharge power P10s60s discharge power P60s；
Step two, when no single under-voltage fault occurs, the actual discharge power P is judgedActiveWhether the discharge power exceeds the warning discharge power PwarningIf not, the effective discharge power switching is realized based on a first preset rule, and if the actual discharge power P is not exceededActiveExceeding the warning discharge power PwarningThen, effective discharge power switching is realized based on a second preset rule;
step three, when a single under-voltage fault exists, 60s discharge power P is adopted60sAs a target, if PoutPower P higher than 60s60sImmediately, the effective discharge power P is obtained according to the slope S4outDown to 60S power P60sTo achieve efficient power switching;
wherein the 10s discharge power P10s60s discharge power P60sRespectively representing the discharge power at 10 seconds and 60 seconds, where P10sRepresents the maximum power, P, of the discharge power maintenance output of the BMS within 10s later60sRepresents the maximum power of the discharge power maintenance output of the BMS for the next 60 s;
the effective discharge power PoutExpressed as the maximum discharge power allowed by the current BMS.
2. The method of claim 1, wherein the first predetermined rule is when the actual discharge power P isActivePower P greater than 60s60sAnd continues for t1After time, the effective discharge power PoutDecrease to 60S power P according to slope S160sWhen the actual discharge power PActivePower P less than or equal to 60s60sAnd continues for t2After time, the effective discharge power PoutRising to 10S power P according to slope S210s。
3. The active discharge power switching method of claim 2, wherein t is1Is 10s, the t2Is 5 s.
4. The active discharge power switching method according to claim 2, wherein the S1 is 7KWH/S, and the S2 is 10 KWH/S.
5. The active discharge power switching method according to claim 1, wherein the second predetermined rule is to set a time threshold t3When P isActiveGreater than PwarningAnd continues for t3After time, the effective discharge power PoutDecreasing to 60S power P according to S3 slope60s。
6. The active discharge power switching method of claim 5, wherein the time t3Is 5 s.
7. The active discharge power switching method according to claim 5, wherein said S3 is 12 KWH/S.
8. The active discharge power switching method according to claim 1, wherein said S4 is 20 KWH/S.
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| JP6552843B2 (en) * | 2015-03-05 | 2019-07-31 | 株式会社東芝 | POWER SUPPLY CONTROL DEVICE FOR MOBILE BODY, POWER SUPPLY CONTROL METHOD, AND POWER SUPPLY CONTROL SYSTEM APPLIED TO THIS POWER SUPPLY CONTROL DEVICE |
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| JP6834864B2 (en) * | 2017-09-11 | 2021-02-24 | トヨタ自動車株式会社 | Battery output monitoring device and method |
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Address after: Room 501, No.8, No.300, Changjiang Road, Yantai Economic and Technological Development Zone, Yantai District, Yantai area, Shandong Province Applicant after: LIGO (Shandong) New Energy Technology Co.,Ltd. Address before: 230000 Floor 1-4, C2 Building, Science Park, Hefei National University, 800 Wangjiangxi Road, Hefei High-tech Zone, Anhui Province Applicant before: ANHUI LIGOO NEW ENERGY TECHNOLOGY Co.,Ltd. |
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Inventor after: Hu Liang Inventor after: Wang Hanchao Inventor after: Wang Yun Inventor after: Jiang Mingjun Inventor after: Yin Kun Inventor after: Sun Yan Inventor after: Liu Huan Inventor after: Li Jie Inventor before: Hu Liang Inventor before: Wang Hanchao Inventor before: Wang Yun Inventor before: Yin Kun Inventor before: Sun Yan Inventor before: Liu Huan Inventor before: Li Jie |
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Address after: Room 501, No. 8, No. 300, Changjiang Road, Yantai Economic and Technological Development Zone, Yantai District, China (Shandong) Pilot Free Trade Zone, Yantai City, Shandong Province, 264000 Patentee after: Ligao (Shandong) New Energy Technology Co.,Ltd. Address before: Room 501, No.8, No.300, Changjiang Road, Yantai Economic and Technological Development Zone, Yantai District, Yantai area, Shandong Province Patentee before: LIGO (Shandong) New Energy Technology Co.,Ltd. |
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