CN111823872A - Braking energy utilization method of four-wheel independent driving system of electric vehicle - Google Patents
Braking energy utilization method of four-wheel independent driving system of electric vehicle Download PDFInfo
- Publication number
- CN111823872A CN111823872A CN202010660899.5A CN202010660899A CN111823872A CN 111823872 A CN111823872 A CN 111823872A CN 202010660899 A CN202010660899 A CN 202010660899A CN 111823872 A CN111823872 A CN 111823872A
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- electric
- battery pack
- braking
- braking energy
- driving system
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000011084 recovery Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000004146 energy storage Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
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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
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
-
- 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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
-
- 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]
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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 discloses a braking energy utilization method for an electric vehicle four-wheel independent driving system, which is characterized in that a braking energy recovery and distribution unit is additionally arranged between an electric driving system and a battery pack assembly, and current generated by electric braking of the electric driving system is divided into two paths after passing through the braking energy recovery and distribution unit; one path is directly entering the battery pack for energy storage, and the other path is used for converting electric energy into heat energy for heating the whole vehicle by warm air, seats, warm water and the like. According to the invention, the whole vehicle braking energy recovery system can be finely designed, a single scheme is not used any more and all working conditions are covered, the whole vehicle braking energy recovery strategy is optimized through the fine working conditions, and the high-efficiency utilization of the whole vehicle braking energy recovery is completed.
Description
Technical Field
The invention relates to a braking energy utilization method for a four-wheel independent driving system of an electric vehicle.
Background
In the world facing more and more stringent emission regulations and more scarce petroleum resources, the motorization of automobiles is a main direction of the current automobile industry revolution, and in the main direction, the electric vehicle of the four-wheel independent electric drive system becomes an emerging field. The four-wheel independent drive electric vehicle has the advantages of being excellent in power economy, high in integration level, small in occupied space of the whole vehicle and flexible in arrangement scheme, and enters the public field of view.
Disclosure of Invention
The invention aims to provide a braking energy efficient utilization scheme for an electric vehicle four-wheel independent driving system, which can still efficiently utilize energy generated by braking when the SOC of a battery pack is at a full power level or a high level hopefully; the large current generated by recovering the braking energy of the four-wheel independent electric drive system is hopefully avoided from directly entering the battery pack, so that the service life of the battery pack is reduced; the whole vehicle braking energy recovery strategy is hopefully enriched, and the whole vehicle braking energy is efficiently utilized; all can be used with this patent.
The invention adopts the following technical scheme for solving the technical problems:
a braking energy utilization method for an electric vehicle four-wheel independent driving system is realized by adding a braking energy recovery and distribution unit between an electric driving system and a battery pack assembly, wherein the braking energy recovery and distribution unit comprises an SOC judgment enabling execution unit, a current judgment enabling execution unit and other signal execution units.
Under the condition that the driving condition of a driver is met, the electric vehicle starts to recover the braking energy:
1) the SOC judgment enabling execution unit judges whether the SOC of the battery pack is larger than a set first limit value alpha, if so, the current generated by electric braking of the electric drive system supplies power to a working device arranged in the electric vehicle, and if not, 2) is executed;
2) the current judgment enabling execution unit judges whether the current generated by the electric braking of the electric driving system is larger than a set threshold value beta, if so, the current generated by the electric braking of the electric driving system is subjected to current reduction and then enters a battery pack or a large-current resistant working device arranged in the electric vehicle for power supply, and if not, the execution unit executes the step 3);
3) the current generated by the electric braking of the electric drive system is directed into the battery pack.
Further, if the current generated by the electric braking of the electric drive system is larger than beta, whether the SOC of the battery pack is larger than a set second threshold value alpha 1 or not is further judged, when the SOC of the battery pack is larger than the set second threshold value alpha 1, the current generated by the electric braking of the electric drive system supplies power for a large-current resistant working device built in the electric vehicle, and when the SOC of the battery pack is smaller than or equal to alpha 1, the current generated by the electric braking of the electric drive system flows down and then enters the battery pack.
Further, when the SOC of the battery pack is less than or equal to alpha 1, the current generated by electric braking of the electric drive system flows down through the rectifying circuit and then enters the battery pack.
Further, α 1< α.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the braking energy of the whole vehicle is efficiently recovered, and the SOC limit condition of the battery pack is avoided;
2. transient large current impact of the battery pack is avoided, and the service life of the battery is prolonged;
3. more directions are provided for the optimized promotion of the whole vehicle braking energy recovery;
4. the method is suitable for pure electric vehicles, hydrogen fuel vehicles, electric hybrid electric vehicles and other electrically driven vehicles.
Drawings
FIG. 1 is an electric vehicle energy flow base plan for a present day four wheel independent electric drive system;
FIG. 2 is an electric vehicle power flow scheme of the four-wheel electric drive system of the present invention;
FIG. 3 is a braking energy recovery distribution unit implementation of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the basic scheme of energy flow of an electric vehicle with a four-wheel independent electric drive system is shown in fig. 1, when the vehicle needs to be driven, the energy flow flows from a battery pack to the electric drive system, and when the whole vehicle is braked, the energy generated by recovering the braking energy flows back to the battery pack to recover and reuse the energy.
However, the architecture of this type has the following problems:
1. when the SOC of the battery pack is at a full charge or high level, the recovery rate of the braking energy is low or cannot be recovered;
2. the large current generated by recovering the braking energy of the four-wheel independent electric drive system directly enters the battery pack, so that the service life of the battery pack is shortened;
the whole framework control scheme is single, and efficient energy utilization of the whole vehicle is not facilitated.
The invention discloses a battery pack assembly, which is characterized in that a braking energy recovery and distribution unit is additionally arranged between an electric driving system and the battery pack assembly, and current generated by electric braking of the electric driving system is divided into two paths after passing through the braking energy recovery and distribution unit; one path is directly entering the battery pack for energy storage, and the other path is used for converting electric energy into heat energy for heating the whole vehicle by warm air, seats, warm water and the like.
As shown in fig. 2 and 3, the architecture scheme mainly includes a four-wheel electric drive system, a battery pack assembly, and a braking energy recovery unit, wherein the braking energy recovery unit includes three execution subsystems, including a first SOC determination enabling execution unit, a second current determination enabling execution unit, and a third remaining signal execution unit; the unit III is in the final judgment level in the strategy, the unit I in the strategy level is preferred or the unit II in the strategy level is preferred, the judgment is determined according to the type selection of the battery cell, the matching of the motor, the running working condition and the like when the type selection of the whole vehicle is matched, and if the lithium titanate and the lithium iron phosphate battery cell are adopted and the vehicle type has a stable running working condition, the judgment sequence of the logic level is suggested to be I → II → III.
When the traditional four-wheel independent driving system electric vehicle recovers braking energy, the SOC of a battery pack is generally required to be considered, and when the SOC of the battery pack is full or the energy is high, the recovery rate of the braking energy is very low. The patent of the invention can fully utilize the electric quantity generated by recovering the braking energy, and as shown in the following figures 2 and 3, the whole vehicle starts to recover the braking energy under the condition that the driving working condition of a driver is met:
firstly, an SOC judgment enabling execution unit judges whether the SOC of the battery pack is larger than a set limit value alpha (at the moment, the SOC of the battery pack is basically higher, and large-current charging cannot be carried out), if so, current generated by electric braking of an electric drive system supplies power for a built-in working device of the electric vehicle, and otherwise, execution is carried out. According to the applicable electric current size of the built-in working device of electric motor car, further design: when the current is less than b1, the current supplies power for the low-current working device; when the current is between b1 and b2, the current enters working devices such as warm air, seat heating, PTC, small batteries and the like; when the current is larger than b2, the current supplies power for the working device which can bear large current, such as super capacitor.
And secondly, the current judgment enabling execution unit judges whether the current generated by the electric braking of the electric driving system is larger than beta (the current generated by the electric braking of the electric driving system is larger and cannot directly charge the battery pack), if so, the current generated by the electric braking of the electric driving system is supplied to the battery pack or a large-current resistant working device arranged in the electric vehicle after current is reduced, and otherwise, the third step is executed. The method comprises the steps of firstly judging whether the SOC of a battery pack is larger than a set threshold value alpha 1, supplying power to a high-current-resistant working device (such as a super capacitor) arranged in the electric vehicle by using current generated by electric braking of an electric driving system when the SOC of the battery pack is larger than the threshold value alpha 1, and allowing the current generated by the electric braking of the electric driving system to flow down through a rectifying circuit and enter the battery pack when the SOC of the battery pack is smaller than or equal to the threshold value alpha 1.
And thirdly, the braking energy recovery current in other situations directly enters the battery pack for charging.
Through this scheme, can carry out the design of refining to whole car braking energy recovery system, no longer use single scheme and cover all operating modes, divide operating mode to optimize whole car braking energy recovery strategy through refining, accomplish the high-effect utilization of whole car braking energy recovery.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the modifications or substitutions within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. A braking energy utilization method for an electric vehicle four-wheel independent driving system is characterized in that the method is realized by adding a braking energy recovery and distribution unit between an electric driving system and a battery pack assembly, wherein the braking energy recovery and distribution unit comprises an SOC judgment enabling execution unit, a current judgment enabling execution unit and other signal execution units;
under the condition that the driving condition of a driver is met, the electric vehicle starts to recover the braking energy:
1) the SOC judgment enabling execution unit judges whether the SOC of the battery pack is larger than a set first limit value alpha, if so, the current generated by electric braking of the electric drive system supplies power to a working device arranged in the electric vehicle, and if not, 2) is executed;
2) the current judgment enabling execution unit judges whether the current generated by the electric braking of the electric driving system is larger than a set threshold value beta, if so, the current generated by the electric braking of the electric driving system is subjected to current reduction and then enters a battery pack or a large-current resistant working device arranged in the electric vehicle for power supply, and if not, the execution unit executes the step 3);
3) the current generated by the electric braking of the electric drive system is directed into the battery pack.
2. The method as claimed in claim 1, wherein if the current generated by the electric braking of the electric drive system is greater than β, it is further determined whether the SOC of the battery pack is greater than a second threshold α 1, when the SOC of the battery pack is greater than the second threshold α 1, the current generated by the electric braking of the electric drive system supplies power to a high current resistant operating device built in the electric vehicle, and when the SOC of the battery pack is less than or equal to α 1, the current generated by the electric braking of the electric drive system flows down and enters the battery pack.
3. The method for utilizing the braking energy of the four-wheel independent driving system of the electric vehicle as claimed in claim 2, wherein when the SOC of the battery pack is less than or equal to α 1, the current generated by the electric braking of the electric driving system is reduced through the rectifying circuit and then enters the battery pack.
4. A method of utilizing braking energy for a four wheel independent drive system of an electric vehicle as claimed in claim 2, wherein α 1< α.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010660899.5A CN111823872A (en) | 2020-07-10 | 2020-07-10 | Braking energy utilization method of four-wheel independent driving system of electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010660899.5A CN111823872A (en) | 2020-07-10 | 2020-07-10 | Braking energy utilization method of four-wheel independent driving system of electric vehicle |
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| Publication Number | Publication Date |
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| CN111823872A true CN111823872A (en) | 2020-10-27 |
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| CN202010660899.5A Pending CN111823872A (en) | 2020-07-10 | 2020-07-10 | Braking energy utilization method of four-wheel independent driving system of electric vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112677817A (en) * | 2020-12-28 | 2021-04-20 | 潍柴动力股份有限公司 | Energy recovery control method, controller and new energy automobile |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050070753A (en) * | 2003-12-30 | 2005-07-07 | 현대자동차주식회사 | Regeneration braking control method for 4 wheel hybrid electric vehicle |
| US20160243947A1 (en) * | 2015-02-23 | 2016-08-25 | Ford Global Technologies, Llc | Battery state of charge target based on predicted regenerative energy |
| CN108215895A (en) * | 2017-12-29 | 2018-06-29 | 吉林大学 | Pure electric automobile recover energy management method and management system |
| CN108482130A (en) * | 2018-03-27 | 2018-09-04 | 吉利汽车研究院（宁波）有限公司 | Energy regenerating control device, vehicle energy recovery system and automobile |
| CN108944466A (en) * | 2018-07-10 | 2018-12-07 | 浙江力邦合信智能制动系统股份有限公司 | Regenerating brake control method and system |
| CN208376535U (en) * | 2018-07-10 | 2019-01-15 | 浙江力邦合信智能制动系统股份有限公司 | Regenerative brake control system |
-
2020
- 2020-07-10 CN CN202010660899.5A patent/CN111823872A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050070753A (en) * | 2003-12-30 | 2005-07-07 | 현대자동차주식회사 | Regeneration braking control method for 4 wheel hybrid electric vehicle |
| US20160243947A1 (en) * | 2015-02-23 | 2016-08-25 | Ford Global Technologies, Llc | Battery state of charge target based on predicted regenerative energy |
| CN108215895A (en) * | 2017-12-29 | 2018-06-29 | 吉林大学 | Pure electric automobile recover energy management method and management system |
| CN108482130A (en) * | 2018-03-27 | 2018-09-04 | 吉利汽车研究院（宁波）有限公司 | Energy regenerating control device, vehicle energy recovery system and automobile |
| CN108944466A (en) * | 2018-07-10 | 2018-12-07 | 浙江力邦合信智能制动系统股份有限公司 | Regenerating brake control method and system |
| CN208376535U (en) * | 2018-07-10 | 2019-01-15 | 浙江力邦合信智能制动系统股份有限公司 | Regenerative brake control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112677817A (en) * | 2020-12-28 | 2021-04-20 | 潍柴动力股份有限公司 | Energy recovery control method, controller and new energy automobile |
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Country or region after: China Address after: 210000 11th floor, building A1, Huizhi science and Technology Park, 8 Hengtai Road, Nanjing Economic and Technological Development Zone, Nanjing City, Jiangsu Province Applicant after: DILU TECHNOLOGY Co.,Ltd. Address before: Building C4, No.55 Liyuan South Road, moling street, Jiangning District, Nanjing City, Jiangsu Province Applicant before: DILU TECHNOLOGY Co.,Ltd. Country or region before: China |