CN102119477A - Onboard electric system for a motor vehicle - Google Patents
Onboard electric system for a motor vehicle Download PDFInfo
- Publication number
- CN102119477A CN102119477A CN2009801306914A CN200980130691A CN102119477A CN 102119477 A CN102119477 A CN 102119477A CN 2009801306914 A CN2009801306914 A CN 2009801306914A CN 200980130691 A CN200980130691 A CN 200980130691A CN 102119477 A CN102119477 A CN 102119477A
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- Prior art keywords
- generator
- battery
- soll
- charged state
- vehicle
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- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 230000014509 gene expression Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 240000004859 Gamochaeta purpurea Species 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/16—Regulation of the charging current or voltage by variation of field
-
- 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)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Control Of Charge By Means Of Generators (AREA)
Abstract
The invention relates to an onboard electric system for a motor vehicle comprising an electric generator (1), a battery (4), a generator controller (6), and at least one consumer load (7, 8) being supplied by the generator (1) and the battery (4). The generator controller (6) is configured in order to provide the generator (1) with a target output voltage (Usoll+Udiff). The generator controller (6) is equipped to detect the load state (SOC) and the load current (list) of the battery (4), and to vary the target output voltage (Usoll+Udiff) of the generator (6) until the load current (list) assumes an amperage (lsoll) that is predetermined as a function of the load state.
Description
Technical field
The present invention relates to a kind of motor vehicle vehicle-mounted electrical system.
Background technology
DE 100 52 315 A1 disclose a kind of vehicle-mounted electrical system, it has generator, by the chargeable battery of this generator, be used to control the generator control apparatus and at least one the load of this generator power output by generator and battery supply feed.Described generator control apparatus can be given generator rated output voltage given in advance, for generator provides described rated output voltage at its splicing ear.
In addition, specified battery current given in advance in the described vehicle-mounted electrical system of knowing.In order to adjust this specified battery current, described control appliance changes the electrical power of exporting on certain load.
Usually, the electric wire that the generator of motor vehicle vehicle-mounted electrical system be can not ignore via length is connected with described load with battery, and according to the current drain of battery and load and pressure drop occurs on described electric wire, it can be a few tenths of volt.When to such an extent as to the voltage on the so strong battery terminal by electric current that load consumed drops to when being lower than its open circuit voltage battery discharge.For avoiding the battery over-discharge can, be provided with the rated voltage of generator high, when the power consumption of generator was small, the charging current that flows through was strong so, and battery is remaining on the time average on the high charged state, and the efficiency of charging under this charged state is relatively little.Therefore, generator must be used unnecessary high power, so that keep battery on its charged state.When the charged state of battery continues when high, the efficient of the energy recuperation by generator operation advance when interrupting (Schubunterbrechung) also very low.
Summary of the invention
The present invention has realized controlling more accurately the charged state of battery.By more accurate control, battery can on average remain on lower charged state, wherein the efficient of charging under this charged state is better, and does not have battery to reach the risk of low critical charged state, and wherein battery no longer can be guaranteed the power supply of load under this low critical charged state.
This realizes in the following manner: in the sort of vehicle-mounted electrical system of explanation at the beginning generator control apparatus is set, so that detect the charged state of battery and the rated output voltage of charging current and change generator, depend on charged state ground current strength given in advance up to charging current.
For this purpose, preferably, generator control apparatus comprises first regulating loop, and its terminal voltage to battery responds, so as the rated output voltage that changes generator until described terminal voltage corresponding to rated value; With second regulating loop, it changes this rated value of terminal voltage, depends on charged state ground strength of charging current given in advance so that adjust.Though by so controllable strength of charging current extractible terminal voltage keeps constant on battery, guarantee the power supply of load abundance constantly.
Preferably, according to the intensity of coming battery charge given in advance in the actual charged state and the deviation between the specified charged state of battery.By with charging current (Ladestrom) given in advance be the continuous function of described deviation, can under the situation of low current intensity and correspondingly low-voltage loss, charge fifty-fifty on the electric wire, this has improved the efficient of vehicle-mounted electrical system again.
Preferably, the specified charged state that depends on temperature ground battery given in advance.For example in order to be provided for starting the necessary electric current of vehicle, relatively low charged state is just much of that under high battery temperature situation, just and only can guarantee reliable startup under obviously higher charged state under low temperature condition.Battery charging state is high more, the energy efficiency of charging, that is to say the electric energy that from battery, can call and the ratio that is used to charge between the energy fluence that this battery consumed just low more.Therefore, the reduction of specified charged state has improved the efficient of system under high-temperature condition.
When for example because the actual charged state of variations in temperature battery higher than specified charged state the time, also can charging current given in advance for negative, as the electric current that battery is discharged.
Be to stop and insecure magnitude of voltage in onboard power system, to occur, can be between the control input end of output that the specified generator output voltage of control appliance is used and generator the connection value limiter.
Generator control apparatus can conform with the destination to be realized by microprocessor system with by the working procedure that this microprocessor system is carried out.Especially when this microprocessor system was also carried out other task except carrying out generator control when, what conform with purpose was: microprocessor system stops the execution to the running of generator control when being set for the load that detects generator and working as the generator fully loaded.Therefore, in this time, can use for other task of microprocessor system by the unwanted computational efficiency of generator control.
Next further feature of the present invention and advantage can be with reference to the accompanying drawings from drawing the explanation to embodiment.
Description of drawings
Wherein,
Fig. 1 illustrates motor vehicle vehicle-mounted electrical system block diagram;
Fig. 2 illustrates the block diagram of the generator control apparatus of the vehicle-mounted electrical system among Fig. 1;
Fig. 3 illustrates the example of first kind of indicatrix of using in control appliance; And
Fig. 4 illustrates the example of second kind of indicatrix of using in control appliance.
Embodiment
In the sketch of Fig. 1,1 expression generator, 2 expression dynamo governors, it will be adjusted to rated value to the output voltage that its lead-out terminal provides from generator 1, wherein this rated value is determined by the control signal that receives on circuit 3,4 expression automotive batteries, 5 expression battery sensors, 6 expressions are used to provide the generator control apparatus of control signal, its be dynamo governor 2 given in advance the rated value of output voltage, 7,8 expression load, 9 expression electric wires, described electric wire connects the lead-out terminal of generator 1 with battery 4 and load 7,8.
Generator 1 and dynamo governor 2 are combined into the construction unit of the type of knowing itself.Control signal on the circuit 3, regulation generator 1 rated output voltage is unique control signal, and it is handled dynamo governor 2.Control signal for example can be the pwm signal that has for the representational duty ratio of generator rated output voltage.As alternative, circuit 3 can also be a bus line, in the control signal of dynamo governor 2 on this bus line with digital form, the control signal with other function group of motor vehicle alternately was transmitted on the time in case of necessity.
Dynamo governor 2 by its with assembly that generator 1 constitutes in be connected with the lead-out terminal of generator 1, so that the voltage that detects on it to be applied, this voltage and the rated voltage of being stipulated by control signal are compared, and change the duty ratio (wherein dynamo governor adds set generator 1 with described exciting current) of exciting current in case of necessity, until obtaining rated output voltage and the consistency between the actual output voltage that is extracted on the splicing ear of generator 1.
The current strength that must provide for 1 in the rated output voltage generator that remains on generator 1 terminal changes according to the quantity of the corresponding load 7,8 that activates simultaneously and fuel consumption values (Verbrauchswerten).Therefore, the pressure drop on the circuit 9 between generator 2 and the battery 4 is variable.
Fig. 3 illustrates the example of described characteristic distribution.Specified charged state SOC_soll is not having to be higher than 80% under the temperature, because battery approaches its maximum charge capacity more, the efficiency of charging process is just low more so.Approximately-30 ℃ in+20 ℃ temperature range, specified charged state progressively drops to about 65% from 80%.When temperature was higher than 20 ℃, specified charged state was constant basically.The temperature dependency of specified charged state is considered the temperature dependency of the internal resistance of cell; In order to start vehicle reliably by means of battery 4, may reduce and poor mobility in the charge carrier quantity owing to motion in battery 4 under the climatic condition of cold, need be than high charged state under warm situation.
Again with reference to figure 2, by the measured temperature T consults memory 10 that derives from battery sensor 5, so that obtain and the corresponding specified state-of-charge value SOC_soll of current battery temperature, then it is compared with the actual charged state SOC that is notified by battery sensor 5 in differential amplifier 11.
In the expansion scheme of simplifying of the present invention, also can cancel input and the memory 10 of measured temperature T, and differential amplifier is connected with the fixed value signal of the constant specified charged state of representative on the contrary, described specified charged state can battery 4 charging capacitys 50% and 95% between selection.
The representational output signal for the difference of actual charged state SOC and specified charged state SOC_soll of differential amplifier 11 is used to inquire about second memory 12.This memory stores characteristic curve, it comes the specified charging current I of regulation battery 4 according to the deviation delta-SOC=SOC-SOC_soll between specified charged state and actual charged state
SollThe example that this characteristic curve shown in Figure 4 distributes.When actual charged state was identical with specified charged state, charging current was 0; If actual charged state lags behind rated condition, charging current increases fast along with the increase of deviation so.When the specified charged state of battery is lower than virtual condition, allow to make the electric current of battery discharge (bearing).Discharging current under overgauge quantitatively usually than a little less than under the strong equally minus deviation situation.Always be different from zero by charging current, when actual charged state is consistent with specified charged state inaccuracy, yet guaranteed battery at most of generator operation time durations only with the weak current charging, make that the loss maintenance that pressure drop produces on the circuit 9 is very little.
Second differential amplifier 13 is at the rated value I of the charging current of its non-inverted input reception memorizer 12
SollAnd receive the actual charge current I of battery sensor 5 at its inverted input
IstTherefore, differential amplifier 13 provide one on proportional and integral controller for representational signal in the difference of the specified strength of charging current of battery and actual charge current intensity, proportional and integral controller is by amplifier 14, integrator stage 15 and be used for adder 16 amplifier 14 and output signal addition integrator stage 15.As the charging current I that records by transducer 5
IstWith specified charging current I
SollWhen identical, then steady state value is got in the output of adder 16, wherein the level got of the output signal of adder 16 is not to determine by parts 10 to 16 regulating loops that constituted, but determine that by second regulating loop next also to be described, this second regulating loop is used as input signal with the output signal of adder 16.
By in second regulating loop, differential amplifier 17 being connected with the output signal of adder 16 and at inverted input and the battery terminal voltage U that is recorded by transducer 5 at non-inverted input
IstConnect, the output signal of adder 16 obtains rated voltage U
SollFunction for battery 4.Output as differential amplifier 17 in first regulating loop is connected with a proportional and integral controller, and this proportional and integral controller is by amplifier 18, integrator stage 19 and be used for the adder 20 of the output signal addition of the output signal of amplifier 18 and integrator stage 19 is formed.Therefore, the output signal of adder 20 and battery terminal voltage U
IstDeviation depend on its rated value together and use U in the drawings
DiffExpression.Another adder 21 is with signal U
SollWith U
DiffAddition, and will and U
Soll+ U
DiffProvide as the rated output voltage signal of generator 1 on circuit 3 via level limiter 22.Such result is, as the cell voltage U that is recorded by transducer 5
IstWith U
SollWhen consistent, that is to say and work as U
DiffBe in order to make cell voltage U
IstWith U
SollThe output voltage of identical generator 1 is with respect to U
SollDuring the voltage difference that must increase, U
DiffJust level off to a fixed value.
Like this, generator control apparatus 6 has been guaranteed load 7,8 is continued sufficient voltage supply and guaranteed the unnecessary high charged state of the expectation of battery 4 on the other hand on the one hand.
According to preferred improvement project, between the output of adder 21 and control circuit 3 switch 23 can also be set, its propelling to vehicle motor is cut off (Schubabschaltung) and is responded and substitute the output signal of adder 21 or level limiter 22 under the situation about cutting off and constant signal is connected with circuit 3 advancing.High or the maximum output voltage that this constant signal can provide corresponding to generator 1.Advance to interrupt before the traffic lights of being everlasting under descent run or the situation about sliding, promptly be used under greater than required situation at the kinetic energy of motor vehicle.By being provided with generator power high in this case by means of switch 23, a described kinetic energy part can be recovered and be stored in the battery 4 by generator 1, and this has just reduced the required amount of fuel of operation generator 1.
Because the output voltage U of generator control apparatus generator 1 only given in advance
Soll+ U
Diff, the task of dynamo governor 2 is, adaptive generator power like this or in generator 1 intensity of the exciting current of feed-in, make and satisfy described regulation.According to an expansion scheme of further developing, dynamo governor 2 for example gives generator control apparatus 6 passbacks a signal by circuit 3, and described signal is for the load factor of generator, for example the duty ratio for the exciting current of feed-in in generator windings is representational.When generator control apparatus is constructed to microprocessor system and above-mentioned regulating loop when correspondingly realizing with form of software, described microprocessor system can be used signal dynamo governor 2, that show the high or maximum load of generator 1, and its mode is that described microprocessor system stops to implement second regulating loop and shows once more that until the signal of dynamo governor 2 generator power is lower than threshold value given in advance.Thereby the output voltage U that can originally can not afford redress at generator
Soll+ U
DiffIn this time, calculate U
DiffCan be saved and be used as other purposes needed computing time.
Claims (8)
1. motor vehicle vehicle-mounted electrical system, described vehicle-mounted electrical system has generator (1), battery (4), generator control apparatus (6) and at least one load (7 by generator (1) and battery (4) feed, 8), wherein said generator control apparatus (6) is set for and is generator (1) rated output voltage (U given in advance
Soll+ U
Diff), it is characterized in that generator control apparatus (6) is set for: the charged state (SOC) and the charging current (I that detect battery (4)
Ist) and the rated output voltage (U that changes generator (6)
Soll+ U
Diff), until this charging current (I
Ist) current strength (I given in advance with depending on charged state
Soll).
2. according to the vehicle-mounted electrical system of claim 1, it is characterized in that first regulating loop (17-20) of generator control apparatus (6) is to the terminal voltage (U of battery (4)
Ist) respond, so that change the rated output voltage (U of generator (6)
Soll+ U
Diff), until described terminal voltage (U
Ist) corresponding to rated value (U
Soll), and second regulating loop (13-16) of generator control apparatus (6) changes the rated value (U of terminal voltage
Soll), depend on charged state ground strength of charging current (I given in advance so that adjust
Soll).
3. according to the vehicle-mounted electrical system of claim 1 or 2, it is characterized in that, according to actual charged state and specified charged state (SOC, SOC_soll) intensity (I of the deviation between (delta-SOC) battery charge given in advance of battery (4)
Soll).
4. according to the vehicle-mounted electrical system of claim 3, it is characterized in that this battery charge (I
Soll) intensity as the continuous function of deviation (delta-SOC) between the actual charged state of this battery and the specified charged state by given in advance.
5. according to the vehicle-mounted electrical system of claim 3 or 4, it is characterized in that the specified charged state (SOC_soll) of described battery depends on that temperature ground is by given in advance.
6. according to the vehicle-mounted electrical system of one of claim 3 to 5, it is characterized in that, be higher than the situation of specified charged state (SOC_soll), battery charge (I given in advance for the actual charged state (SOC) of battery (4)
Soll) for negative.
7. according to the vehicle-mounted electrical system of one of foregoing claim, it is characterized in that, at specified generator output voltage (U
Soll) output and the control input end of generator (1) between the value of being connected with limiter (22).
8. according to the vehicle-mounted electrical system of one of foregoing claim, it is characterized in that, this generator control apparatus (6) realizes by microprocessor system with by the working procedure that this microprocessor system is carried out, and this microprocessor system is set for the load that detects generator (1) and stops execution to working procedure when generator (1) full load.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008041027.6 | 2008-08-06 | ||
| DE102008041027A DE102008041027A1 (en) | 2008-08-06 | 2008-08-06 | On-board electrical system for a motor vehicle |
| PCT/EP2009/057424 WO2010015451A1 (en) | 2008-08-06 | 2009-06-16 | Onboard electric system for a motor vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102119477A true CN102119477A (en) | 2011-07-06 |
Family
ID=41168436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801306914A Pending CN102119477A (en) | 2008-08-06 | 2009-06-16 | Onboard electric system for a motor vehicle |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2311169A1 (en) |
| CN (1) | CN102119477A (en) |
| DE (1) | DE102008041027A1 (en) |
| WO (1) | WO2010015451A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109148987A (en) * | 2017-06-19 | 2019-01-04 | 罗伯特·博世有限公司 | Charging method for rechargeable electrochemical energy accumulator |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8324864B2 (en) | 2010-08-17 | 2012-12-04 | GM Global Technology Operations LLC | Battery fast charging current control algorithm |
| DE102011012818B4 (en) * | 2011-03-02 | 2016-11-24 | Volkswagen Ag | Method and device for operating a battery for a vehicle and corresponding vehicle |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58201534A (en) * | 1982-05-18 | 1983-11-24 | 三菱電機株式会社 | Charge control microcomputer for vehicle |
| US6331762B1 (en) * | 1997-11-03 | 2001-12-18 | Midtronics, Inc. | Energy management system for automotive vehicle |
| CA2271123A1 (en) * | 1996-11-08 | 1998-05-14 | Alliedsignal Inc. | Vehicular power management system and method |
| DE60045169D1 (en) * | 1999-09-09 | 2010-12-09 | Toyota Motor Co Ltd | System for measuring the battery capacity and calculating the remaining capacity |
| DE10052315A1 (en) | 2000-10-21 | 2002-05-02 | Bosch Gmbh Robert | Method for regulating the power supply of controllable consumers in a motor vehicle |
| US6624618B2 (en) * | 2001-01-25 | 2003-09-23 | Ford Global Technologies, Llc | System and method for vehicle voltage regulation |
| US6809501B2 (en) * | 2003-03-11 | 2004-10-26 | General Motors Corporation | Method of improving fuel economy |
| JP4969943B2 (en) * | 2006-08-10 | 2012-07-04 | 株式会社デンソー | Battery charge / discharge current detector |
| JP4497150B2 (en) * | 2006-10-24 | 2010-07-07 | 株式会社デンソー | Charge control system |
-
2008
- 2008-08-06 DE DE102008041027A patent/DE102008041027A1/en not_active Withdrawn
-
2009
- 2009-06-16 EP EP09779777A patent/EP2311169A1/en not_active Withdrawn
- 2009-06-16 WO PCT/EP2009/057424 patent/WO2010015451A1/en active Application Filing
- 2009-06-16 CN CN2009801306914A patent/CN102119477A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109148987A (en) * | 2017-06-19 | 2019-01-04 | 罗伯特·博世有限公司 | Charging method for rechargeable electrochemical energy accumulator |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008041027A1 (en) | 2010-02-11 |
| WO2010015451A1 (en) | 2010-02-11 |
| EP2311169A1 (en) | 2011-04-20 |
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Application publication date: 20110706 |