CN1996705A - DC-DC conversion control system and control method of the mixed driven car - Google Patents
DC-DC conversion control system and control method of the mixed driven car Download PDFInfo
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- CN1996705A CN1996705A CNA2006101662673A CN200610166267A CN1996705A CN 1996705 A CN1996705 A CN 1996705A CN A2006101662673 A CNA2006101662673 A CN A2006101662673A CN 200610166267 A CN200610166267 A CN 200610166267A CN 1996705 A CN1996705 A CN 1996705A
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- 238000003745 diagnosis Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
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- 230000000295 complement effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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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
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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
- Y02T10/72—Electric energy management in electromobility
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
This invention relates to one mixture dynamic mobile DC to DC conversion control system and its method, which comprises high voltage dynamic power system and low voltage mobile electrical system and is characterized by the following parts: converter is connected to controller through one set of signal wire to combine converter and controller to fulfill control and execution, wherein, the converter determines the its work status according to low voltage electrical system and high voltage battery status and environment temperature and itself factors.
Description
Technical field:
The present invention relates to a kind of DC-DC (DC-to-DC) conversion method of hybrid vehicle, and particularly the hybrid vehicle high voltage power supply is to the DC-DC switching control system and the control method thereof of low-voltage electric system power supply.
Background technology:
At present, cleaning vehicles efficient, energy-saving and environmental protection just become the automobile industry new development trend.For this reason, hybrid vehicle (Hybrid Electric Vehicle, abbreviation HEV) is because of it has the low emission advantage of electric motor car concurrently with the high-energy-density advantage of internal-combustion engines vehicle more and more receives publicity, and becomes one of new vehicle that the current stage researches and develops unexpectedly mutually.(for example: motor) be installed in simultaneously on the automobile to vehicle provides actuating force, on the described mixed power car, auxiliary power unit is actually a high power motor to so-called hybrid vehicle with low-powered engine and auxiliary power source exactly.Exactly conventional engines is done for a short time as far as possible, allowed a part of power bear by electrokinetic cell-electric motor system.It is long that this mixed power plant had both been brought into play the engine continuous working period, the advantage of good dynamic property can be brought into play pollution-free, the low noise benefit of motor again, the two collaborative work, learn from other's strong points to offset one's weaknesses, promptly keep desired vehicle power can reduce fuel consume again.The generation of hybrid vehicle can effectively solve the energy and the environmental issue that the Hyundai Motor industry is brought, the power of the hybrid electric vehicle engine generally engine than at the same level is little, by reasonable control to engine and motor, make and guarantee that engine often is in running under the most effective state by the two cooperating.
In the DC-DC coverter for mixed power vehicle schemes that adopt air-cooled independent installation, on control method, adopt the DC-DC transducer independently to control or the entire car controller assist control both at home and abroad more.There is the shortcoming that volume is big, be difficult for installation in air-cooled DC-DC transducer; Independently be controlled at design after, should not change the drawback of control method and controllability, upgradability difference.Extensively retrieve at the problems referred to above, do not find relevant solution as yet.
Summary of the invention:
Purpose of the present invention is exactly the shortcoming that exists in the prior art for overcoming, and utilizes entire car controller to realize dynamically adjusting the output characteristic of DC-DC converting system, makes the high voltage power battery provide electric energy to be in the optimum state of control to the low pressure vehicle-mounted electrical system.
To achieve these goals, the present invention has adopted following technical scheme:
The DC-DC switching control system of hybrid vehicle, comprise high voltage power power-supply system and low pressure vehicle-mounted electrical system, be associated with the DC-DC transducer between high voltage power power-supply system and the low pressure vehicle-mounted electrical system, it is characterized in that: the DC-DC transducer is connected with mixed power entire car controller by one group of holding wire, the various signals that the DC-DC transducer needs can shared entire car controller in corresponding transducer, finish the control and the diagnosis of DC-DC transducer by entire car controller.The DC-DC transducer mainly passes through holding wire DC-DC enable, DC-DC set, and DC-DC OK, DC-DC load, DC-DC ref is connected with mixed power entire car controller.
The employed control method of DC-DC switching control system according to above-mentioned hybrid vehicle is characterized in that having adopted the following step:
Detection also judges whether the A-battery in the low pressure Vehicular power system needs charging;
If do not need charging, then close the DC-DC transducer;
Charging is if desired then obtained state-of-charge value SOC from the electrokinetic cell of power battery management system by the CAN net;
When SOC＜=50%, close the DC-DC transducer;
When 70%＞SOC＞50%, and engine running, allow to open the DC-DC transducer;
When 80%＞SOC＞70%, allow out the DC-DC transducer.
The essence of above-mentioned control method is: DC-DC transducer and mixed power entire car controller are combined control and the execution of finishing jointly the DC-DC transducer, the DC-DC transducer decides the operating state of DC-DC transducer according to the state factor of operating state, ambient temperature and the DC-DC transducer of state-of-charge, engine and the big motor of the need for electricity of vehicle-mounted low-voltage electric system, high voltage power battery itself, and the DC-DC transducer will be controlled the output characteristic of DC-DC transducer dynamically according to these factors.
Because in hybrid vehicle, reduce the load of engine accessory power rating as far as possible, be to reduce the effective way that fuel consume improves engine operation efficient.Owing on hybrid vehicle, have electric system of high voltage direct current and the electric system of low-voltage direct simultaneously, cancelled the small generators of former car among the present invention, DC-DC (DC-to-DC) converting system that has self-diagnostic function with a cover replaces original small generators.This cover system can become the voltage that is complementary with the automobile low-voltage electric system to high-tension electricity by step-down, to the low-voltage electric system power supply with to little charge in batteries.
The invention has the advantages that: 1, the cancellation small generators can further reduce the load of hybrid electric vehicle engine, can give full play to the advantage of hybrid vehicle like this, improves high voltage power power supply energy utilance, further reduces the consumption of vehicle fuel; 2, the DC-DC among the present invention (DC-to-DC) converting system control method makes this cover system have high conversion efficiency (its conversion efficiency can reach more than 90%), high power density, high reliability, antijamming capability is strong, output voltage and power output are controlled, characteristics such as low cost.
Description of drawings:
Fig. 1 is DC-DC transducer and entire car controller catenation principle block diagram;
Fig. 2 is a DC-DC conversion switching control method flow chart;
Fig. 3 is maximum safe working load of DC-DC transducer and power battery charged state graph of a relation;
Embodiment:
As shown in Figure 1, DC-DC converting system among the present invention can be according to state-of-charge, the engine behavior of electrokinetic cell, the operating state that the information such as temperature of the state-of-charge of the load condition of low-voltage electric system, the little storage battery of low pressure, DC-DC transducer self are come intelligent selection DC-DC transducer.Mainly finish from the high voltage power electric system and give the power supply of low pressure vehicle-mounted electrical system, give the little charge in batteries of low pressure, adjust low-voltage electric system to a specific magnitude of voltage, functions such as the switch control of DC-DC converting system.This DC-DC transducer makes full use of the mixed resource of power car own and realizes its function, on mechanical structure, with the shared water-cooling system of hybrid power entire car controller; On control realizes, finish the control and the diagnostic function of DC-DC transducer jointly by entire car controller and DC-DC transducer.
Mainly be by DC-DC enable between DC-DC transducer and the hybrid power entire car controller, DC-DC set, DC-DC OK, DC-DC load, carry out communication between DC-DC ref equisignal line and the hybrid power entire car controller, wherein, DC-DC enable is the control signal that enables of DC-DC transducer, and entire car controller can be controlled the startup of DC-DC transducer and stops by this signal; DC-DC set is output voltage and the output current that is used for being provided with the DC-DC transducer; DC-DC OK is the feedback signal of DC-DC transducer operating state; DC-DC load and DC-DC ref are the service loads that is used for feeding back the DC-DC transducer; The signal that the control of other DC-DC transducers needs can shared entire car controller transducer, such as the voltage sensor of vehicle-mounted low-voltage electric system, the environment temperature sensor of vehicle operation etc.
The present invention has also adopted the control method as shown in Figure 2, after the DC-DC control system powers on, to at first detect ignition switch whether in the position of ON, whether connect by the main relay of CAN network measuring high voltage power battery again, detect the voltage of A-battery and judge whether A-battery needs charging, charging if desired, the DC-DC control system will be obtained SOC (state-of-charge) information from the electrokinetic cell of BMS (power battery management system) by the CAN network, obtain the initial voltage output valve of the low-voltage output under this ambient temperature by tabling look-up; At this moment,, possesses preliminary condition, if SOC＜50% is then directly closed the DC-DC converting system, with the protection electrokinetic cell system to the power supply of voltage electrical system if the SOC of electrokinetic cell＞50% shows that power battery charged state is better.Under the condition of 50%＜SOC＜70%, if engine turns round, DC-DC converting system error-free information returns simultaneously, will enable DC-DC enable signal, allows DC-DC to open to low-voltage electric system and powers; In addition, if the state-of-charge of electrokinetic cell is fine: SOC＞70% o'clock, even engine is in halted state, if when DC-DC converting system error-free information returns, equally also will enable DC-DC enable signal, and allow DC-DC to open and power to low-voltage electric system.Design DC-DC converting system control method purpose (as Fig. 2) and prevent that the overdischarge phenomenon from appearring in electrokinetic cell in to stall, cause the damage of electrokinetic cell, because in engine running, big motor can in time give power battery charging to keep state-of-charge preferably.But when the state-of-charge of electrokinetic cell is good,, be to allow the work of DC-DC converting system to the low-voltage electric system charging in order to guarantee in time even to stall the time.This is that charge-discharge characteristic according to electrokinetic cell decides: the charge-discharge characteristic of the SOC of electrokinetic cell between 50%～70% is best, can finish the charging of battery at short notice; But, can cause electrokinetic cell to damage electrokinetic cell because of overcharging electric capacity when electrokinetic cell during at SOC＞80%; When electrokinetic cell during, can cause electrokinetic cell to damage electrokinetic cell because of overdischarge at SOC＜40%.So BMS (power battery management system) will control electrokinetic cell not in the regional work of SOC＞80% or SOC＜40%.The DC-DC transducer will be selected its live load according to the SOC of vehicle-mounted low-voltage electric system need for electricity and high voltage power battery.The DC-DC transducer also will dynamically be adjusted its maximum live load (as Fig. 3) that allows according to the state-of-charge of electrokinetic cell.This control method powers to low-voltage electric system can taking all factors into consideration electrokinetic cell characteristic and low-voltage electric system need for electricity.
As shown in Figure 3, according to the charge-discharge characteristic of electrokinetic cell, the maximum safe working load of DC-DC transducer is divided into 5 zones, among the figure in the maximum safe working load zone of the corresponding different DC-DC converting system in different zones.
Claims (2)
1, the DC-DC switching control system of hybrid vehicle, comprise high voltage power power-supply system and low pressure vehicle-mounted electrical system, be associated with the DC-DC transducer between high voltage power power-supply system and the low pressure vehicle-mounted electrical system, it is characterized in that: the DC-DC transducer is connected with mixed power entire car controller by one group of holding wire, the various signals that the DC-DC transducer needs can shared entire car controller in corresponding transducer, finish the control and the diagnosis of DC-DC transducer by entire car controller.
2, the employed control method of DC-DC switching control system of hybrid vehicle according to claim 1 is characterized in that having adopted the following step:
Detection also judges whether the A-battery in the low pressure Vehicular power system needs charging;
If do not need charging, then close the DC-DC transducer;
Charging is if desired then obtained state-of-charge value SOC from the electrokinetic cell of power battery management system by the CAN net;
When SOC＜=50%, close the DC-DC transducer;
When 70%＞SOC＞50%, and engine running, allow to open the DC-DC transducer;
When 80%＞SOC＞=70%, allow out the DC-DC transducer;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101662673A CN1996705B (en) | 2006-12-21 | 2006-12-21 | DC-DC conversion control system and control method of the mixed driven car |
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|---|---|---|---|
| CN2006101662673A CN1996705B (en) | 2006-12-21 | 2006-12-21 | DC-DC conversion control system and control method of the mixed driven car |
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| CN1996705A true CN1996705A (en) | 2007-07-11 |
| CN1996705B CN1996705B (en) | 2011-06-08 |
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| CN2006101662673A Expired - Fee Related CN1996705B (en) | 2006-12-21 | 2006-12-21 | DC-DC conversion control system and control method of the mixed driven car |
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Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009129685A1 (en) * | 2008-04-25 | 2009-10-29 | 奇瑞汽车股份有限公司 | Vehicle double voltage dc/dc converting device |
| CN101207331B (en) * | 2007-11-07 | 2010-11-17 | 奇瑞汽车股份有限公司 | Control method of commingle dynamic force automobile DC-DC |
| CN101931253A (en) * | 2010-08-31 | 2010-12-29 | 重庆长安汽车股份有限公司 | CAN bus-based pure electric vehicle charging method and system |
| CN102104326A (en) * | 2009-12-16 | 2011-06-22 | 台达电子工业股份有限公司 | Vehicle-used DC-to-DC conversion device with communication function |
| CN102381209A (en) * | 2011-10-13 | 2012-03-21 | 奇瑞汽车股份有限公司 | Fault managing method for low-voltage storage battery of pure electric automobile |
| CN101141014B (en) * | 2007-09-03 | 2012-03-28 | 奇瑞汽车股份有限公司 | Direct current converting device control method of mixed power vehicle |
| CN102545585A (en) * | 2010-12-23 | 2012-07-04 | 上海汽车集团股份有限公司 | Method for controlling voltage set point of direct-current high-voltage/low-voltage converter |
| CN102632809A (en) * | 2011-02-14 | 2012-08-15 | 福特全球技术公司 | Electric vehicle and method of control for active auxiliary battery depletion |
| CN102862471A (en) * | 2011-07-04 | 2013-01-09 | 上海华普汽车有限公司 | Charging device and charging method of hybrid car |
| CN104578270A (en) * | 2014-12-24 | 2015-04-29 | 山东新大洋电动车有限公司 | Vehicle-mounted low-voltage power supply device for battery electric vehicle |
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| CN112583068A (en) * | 2020-11-04 | 2021-03-30 | 长城汽车股份有限公司 | Control method and system of direct current/direct current DC/DC converter |
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