CN102790240B - The balance control method of the storage battery degree of aging in automobile power supply system - Google Patents
The balance control method of the storage battery degree of aging in automobile power supply system Download PDFInfo
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- CN102790240B CN102790240B CN201110126121.7A CN201110126121A CN102790240B CN 102790240 B CN102790240 B CN 102790240B CN 201110126121 A CN201110126121 A CN 201110126121A CN 102790240 B CN102790240 B CN 102790240B
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The present invention relates to automotive electronic technology, particularly a kind of method making electric energy balanced storage between storage battery in utilizing polylith storage battery as the automobile power supply system of energy storage device.According to balancing energy storage means of the present invention, the described pair of storage battery car electric power system comprises generator and is coupled to form the first storage battery of current supply circuit and starter parallel coupled with the second storage battery forming starting-up later time and the control unit be controllably coupling between described current supply circuit and described starting-up later time with described parallel operation of generator, wherein, the following step is comprised: described control unit determines the gap amount of the degree of aging of described first and second storage batterys; Described control unit determines whether described gap amount departs from the scope preset; And if described gap amount exceed described in the scope that presets, then described control unit make described generator to the described first or second charge in batteries with make described gap amount fall back to described within the scope that presets.
Description
Technical field
The present invention relates to automotive electronic technology, particularly a kind of method of equalizing battery degree of aging in utilizing polylith storage battery as the automobile power supply system of energy storage device.
Background technology
Automobile power supply system forms primarily of energy storage device (such as storage battery or ultracapacitor), energy conversion device (such as mechanical energy being converted to the generator of electric energy), starter and control unit.In automobile power supply system, control unit is the core of whole system, and it is responsible for determining according to operating modes such as power load, battery condition and Generator Status and implementing suitable electric energy management strategy.Starter utilizes the energy of storage battery by automobile engine starting, and engine is operated under required operating state.During engine running, drive electrical generators is generated electricity, and the voltage request pressing automotive electrical system is to the electricity consumption load supplying of automobile with to charge in batteries.Such as, under the control of the control unit, if the electricity consumption electric current of automotive electrical system is greater than the supply current of generator, then storage battery will discharge, with the electric current of covering the shortage, otherwise, if the electricity consumption electric current of automotive electrical system is less than the supply current of generator, then difference between current a part as storage battery charging current and flow into storage battery.
The use electric loading of automobile often has larger difference in electrical characteristic, such as, need during starter work to provide large peace immediate current doubly, and throw light on, small area analysis that the equipment such as sound equipment needs to provide the long period.In order to meet the need for electricity of above-mentioned two class loads simultaneously, industry generally adopts the storage battery of a Large Copacity and large polar plate area.But the shortcoming of this method is the shortening causing the life of storage battery, this is because may following situations be there is: after a particular period of use, storage battery is available as the accumulator started, but but cannot power for a long time, although or can power for a long time, but but cannot provide big current, in the face of these situations, it will be inevitable for changing storage battery.
For the power consumption characteristics of different load, automobile power supply system can adopt double cell to design, namely storage battery comprises starting type accumulators and power supply type storage battery, the former and starter motor compose in parallel starting-up later time, the latter and electricity consumption device compose in parallel current supply circuit, and electrical system control device can control the keying of starting-up later time and current supply circuit respectively.In above-mentioned double cell design, along with enabling of storage battery, their degree of aging will produce difference.If this difference is excessive, certainly will cause seriously do not mate the useful life of two pieces of storage batterys, this will cause the increase of maintenance and repair cost.
Summary of the invention
An object of the present invention is to provide the balance control method of the storage battery degree of aging in a kind of automobile power supply system, it has control mode flexibly and the advantage of successful.
Above-mentioned purpose of the present invention is realized by following technical proposal:
The balance control method of the storage battery degree of aging in a kind of automobile power supply system, the described pair of storage battery car electric power system comprises generator and is coupled to form the first storage battery of current supply circuit and starter parallel coupled with the second storage battery forming starting-up later time and the control unit be controllably coupling between described current supply circuit and described starting-up later time with described parallel operation of generator, wherein, the following step is comprised:
Described control unit determines the degree of aging of described first and second storage batterys;
Described control unit determines the gap amount of the degree of aging of described first and second storage batterys;
If the gap amount of the degree of aging of described first and second storage batterys departs from the scope preset, then described control unit is by adopting corresponding power supply strategy to make the degree of aging of described first and second storage batterys reach unanimity.
Preferably, in the above-mentioned methods, described control unit determines the degree of aging A of described first and second storage batterys according to the following formula:
Wherein, C
st () completely fills capacity at moment t, C for described first and second storage batterys
nit is the nominal capacity of the first and second storage batterys.
Preferably, in the above-mentioned methods, described first and second storage batterys completely fill capacity C at moment t
st () is by measuring the internal resistance of described first and second storage batterys and determining according to predetermined internal resistance-relation of completely filling between capacity.
Preferably, in the above-mentioned methods, the internal resistance of described first and second storage batterys adopts alternating current method to record.
Preferably, in the above-mentioned methods, the upper and lower bound of the scope preset described in is asymmetrical.
Preferably, in the above-mentioned methods, described degree of aging is divided into multiple scope, the corresponding centrifugal pump of each scope, and described control unit determines the gap amount of the degree of aging of described first and second storage batterys according to following manner:
According to the large young pathbreaker of the degree of aging of described first and second storage batterys, it is mapped as corresponding centrifugal pump; And
The centrifugal pump of the degree of aging of described first and second storage batterys is subtracted each other to determine described gap amount.
Preferably, in the above-mentioned methods, the quantity of described scope is five, gives centrifugal pump 1,2,3,4 and 5 respectively according to order from big to small.
Preferably, in the above-mentioned methods, described control unit according to following manner, by adopting corresponding power supply strategy to make the degree of aging of described first and second storage batterys reach unanimity:
Preferably, in the above-mentioned methods, described control unit according to following manner, by adopting corresponding power supply strategy to make the degree of aging of described first and second storage batterys reach unanimity:
If described gap amount exceeds the upper limit of described preset range, then described control unit makes the state-of-charge of described second storage battery remain on a preset level; If described gap amount exceeds the lower limit of described preset range, then, when the power consumption equipment of automobile needs storage battery power supply, described control unit makes described first and second storage batterys power simultaneously, and described first threshold is less than described Second Threshold.
Preferably, in the above-mentioned methods, described control unit makes the state-of-charge of described second storage battery remain on a preset level according to following manner:
When the state-of-charge of described second storage battery is less than described preset level, if automobile is in transport condition and the power supply capacity of described generator is greater than the power load of automobile, then described control unit makes described generator to described second charge in batteries until the state-of-charge of described second storage battery reaches described preset level, otherwise described control unit makes described first storage battery to described second charge in batteries until the state-of-charge of described second storage battery reaches described preset level.
Preferably, in the above-mentioned methods, described control unit according to following manner, by adopting corresponding power supply strategy to make the degree of aging of described first and second storage batterys reach unanimity:
Preferably, in the above-mentioned methods, described control unit according to following manner, by adopting corresponding power supply strategy to make the degree of aging of described first and second storage batterys reach unanimity:
Prescribe a time limit when described gap amount exceeds the upper of described preset range, if ambient temperature is lower than a preset value, then when automobile starting, described control unit makes described first and second storage batterys power to described starter simultaneously.
In one embodiment of the invention, degree of aging is divided into multiple scope and gives corresponding centrifugal pump, this can simplify the calculating of gap amount and can adapt to different application requirements neatly by the value changing centrifugal pump.In addition, in one embodiment, determining that the degree of aging of storage battery can reduce the complexity of measurement by measuring internal resistance, being suitable for the degree of aging of dynamic regulation storage battery.
From following detailed description by reference to the accompanying drawings, above and other objects of the present invention and advantage will be made more completely clear.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of exemplary two storage battery car electric power systems.
Fig. 2 is the structural representation of the control unit in two storage battery car electric power system shown in Fig. 1.
Fig. 3 is the workflow diagram of the degree of aging balance control method according to one embodiment of the invention.
Fig. 4 is the schematic diagram of the circuit for measuring accumulator internal resistance according to one embodiment of the invention.
Embodiment
Below by the specific embodiment of the present invention being described with reference to the drawings to set forth the present invention.But it is to be appreciated that these embodiments are only exemplary, restriction be there is no for spirit of the present invention and protection range.
In this manual, " coupling " one word to should be understood to be included between two unit the situation directly transmitting energy or signal, or indirectly transmit the situation of energy or signal through one or more Unit the 3rd, and alleged signal includes but not limited to the signal of the form of electricity, light and magnetic existence here.In addition, " comprise " and the term of " comprising " and so on represents except having the unit and step that have in the specification and in the claims directly and clearly state, technical scheme of the present invention does not get rid of the situation had not by other unit of directly or clearly stating and step yet.Moreover the term of such as " first ", " second ", " the 3rd " and " the 4th " and so on does not represent order in time, space, size etc. of unit or numerical value and is only be used as to distinguish each unit or numerical value.
In addition, storage battery described here refers to and converts chemical energy electric energy can be produced galvanic device, and it includes but not limited to lead acid accumulator and lithium battery etc.
two storage battery car electric power system
Fig. 1 is the schematic diagram of exemplary two storage battery car electric power systems.See Fig. 1, this pair of storage battery car electric power system 10 comprises control unit 110, generator 120, first and second storage battery 130A and 130B and the first-four switching device K1-K4.In FIG, heavy line represents power or energy flow, and fine line represents control signal and measuring-signal stream.It is worthy of note, although here control unit 110 is connected with bus mode with the first-four switching device K1-K4 and generator 120, but this does not also mean that and must be confined to this connected mode between control unit and controlled unit, in fact can adopt point-to-point connected mode between them yet.
In FIG, control unit 110 is cores of whole electric power system 10, it is responsible on the one hand according to electricity consumption situation (such as using the need for electricity of electric loading 30 and 40), battery condition (is such as the operating current of the first and second storage battery 130A and 130B here, operating voltage, temperature, one or more in degree of aging and state-of-charge (SOC)) and Generator Status (the current operating current that can provide of such as generator) etc. determine suitable electric energy management strategy, on the other hand, control unit 110 also has DC-to-DC transfer capability, to provide suitable charging voltage by boosting and reduced pressure operation to the first and second storage battery 130A and 130B.The above-mentioned functions of control unit 110 will be further described below.
As shown in Figure 1, the first storage battery 130A, generator 120 and be connected in parallel to form current supply circuit by electric loading 30.Control unit 110 accesses this current supply circuit through the first switching device K1.Meanwhile, the first storage battery 130A is also connected with the second storage battery 130B through second switch device K4.On the other hand, the second storage battery 130B, starter 20 and be connected in parallel to form starting-up later time by electric loading 40.Control unit 110 accesses this starting-up later time through second switch device K2.Thus, in the electric power system shown in basis, comprise two connected passages between first and second storage battery 130A, 130B, wherein one through control unit 110, and another is Bypass control unit 110 then.It is worthy of note, although use electric loading 30 and 40 here illustrates with two square frames, but in fact they refer to two groups by electric loading, wherein, automobile is referred at the car electrics irrelevant with startup by electric loading 30, include but not limited to car light, air blast, air-conditioning and sound equipment etc., and refer to the electronic equipment relevant to automobile starting by electric loading 40, include but not limited to various for measuring startup time state transducer and electronic control unit (ECU) etc.In this example, power primarily of the second storage battery 130B by electric loading 40, and when the second storage battery 130B power supply capacity is not enough, is combined by the first and second storage battery 130A and 130B and power to by electric loading 40.
In the electric power system shown in Fig. 1, control unit 110 utilize the first-four switching device K1-K4 come control circuit turn on and off realize corresponding electric energy management strategy, wherein, turning on and off of passage between current supply circuit and control unit 110 is controlled by the first switching device K1, turning on and off of passage between starting-up later time and control unit 110 is controlled by second switch device K2, second storage battery 130B and being controlled by the 3rd switching device K3 with turning on and off of the passage between electric loading 40, first and second storage battery 130A, the turning on and off of passage be directly connected between 130B is controlled by the 4th switching device K4.Keying and the disconnection of above-mentioned first-four switching device K1-K4 are all controlled by control unit 110, and they such as can be realized by relay.
In this example, the power supply (also i.e. starter 20 and the power supply by electric loading 40) in automobile starting stage is responsible for providing primarily of the second storage battery 130B.Due to startup stage need large immediate current, therefore can the second storage battery 130B be designed to compared with the first storage battery 130A, have larger polar plate area be beneficial to improve export current strength.In addition, power primarily of the first storage battery 130A and generator 120 by electric loading 30.Owing to being need to provide long small area analysis with the characteristics of power supply of electric loading, therefore the first storage battery 130A can be designed as compared with the second storage battery 130B, and pole plate is formed thicker active material.
control unit
Fig. 2 is the structural representation of the control unit in two storage battery car electric power system shown in Fig. 1.As shown in Figure 2, control unit 110 comprises device for managing and controlling electrical source 1101, DC-DC conversion device 1102 and battery condition monitoring device 1103.In fig. 2, heavy line represents power or energy flow, and fine line represents control signal and measuring-signal stream.Device for managing and controlling electrical source 1101, between DC-DC conversion device 1102 and battery condition monitoring device 1103 by the LINK bus communication of unit inside, and device for managing and controlling electrical source 1101 and battery condition monitoring device 1103 are communicated by the CAN of unit outside and external equipment (such as the first-three switching device K1-K4, with electric loading 30, generator 120 etc.).
Device for managing and controlling electrical source 1101 is determined suitable electric energy management strategy according to electricity consumption situation, battery condition and Generator Status etc. and generates corresponding control command.These control commands are provided to the DC-DC conversion device 1102 and battery condition monitoring device 1103 that are positioned at control unit 110 inside and the first-four switching device K1-K4 being positioned at control unit 110 outside.About the determination mode of electric energy management strategy will be described in detail below.
The output voltage of DC-DC conversion device 1102 self generator 120, first and second storage battery 130A and 130B in future is transformed to required direct voltage.Such as, DC-DC conversion device 1102 can be made DC-to-DC conversion operations to the output of generator 120 and charge to the second storage battery 130B to make generator 120, or can make DC-to-DC conversion operations to the output of the first storage battery 130A and charge to the second storage battery 130B to make the first storage battery 130A.And for example, DC-DC conversion device 1102 can be made DC-to-DC conversion operations to the output of the second storage battery 130B and charges to the first storage battery 130A to make the second storage battery 130B.
Battery condition monitoring device 1103 is connected the state parameter (operating voltage of such as storage battery, operating current and temperature etc.) of monitoring the first and second storage battery 130A and 130B by CAN with transducer.The state parameter recorded is sent to device for managing and controlling electrical source 1101 by the LINK bus through control unit 110 inside.Battery condition monitoring device 1103 is configured to have sensor fault diagnosis function.Specifically, can be the first and second storage battery 130A with 130B and be equipped with the consistent or basically identical transducer group of two groups of performances, and the utilization rate of two pieces of storage batterys is controlled similar or close (such as being remained in a less scope by the difference of the SOC making the first and second storage battery 130A and 130B).Battery condition monitoring device 1103 regularly or aperiodically can monitor the degree of aging (such as by the internal resistance of measurement two pieces of storage batterys) of the first and second storage battery 130A and 130B, and if their internal resistance difference comparatively large (threshold value that such as absolute difference is default more than), then battery condition checkout gear 1103 can judge that transducer group breaks down.
degree of aging Balance route process
By Fig. 3, an embodiment according to the storage battery degree of aging balance control method in automobile power supply system of the present invention is described below.For setting forth conveniently, be described for the two storage battery car electric power systems shown in Fig. 1 and 2 here.But it should be understood that above-mentioned workflow also can be applicable to two storage battery car electric power systems of other type.
See Fig. 3, in step 310, the battery condition monitoring device 1103 of control unit 110 is measured the state parameter (internal resistance of such as storage battery) of the first and second storage battery 130A and 130B and is sent to device for managing and controlling electrical source 1101 through LINK bus.
Subsequently in step 320, according to the state parameter that battery condition monitoring device 1103 obtains, device for managing and controlling electrical source 1101 determines that capacity is filled in current the expiring of first and second storage battery 130A, 130B.Generally speaking, Measurement accuracy completely fills capacity to be needed to carry out deep discharge to storage battery, and this is the process of a long heavy-current discharge, has higher requirement, be not suitable for on-line testing fast to the fail safe that circuit connects.The present inventor finds through further investigation, storage battery expire the relation of filling and existing between capacity and the accumulator internal resistance recorded and determining, and for the storage battery of same or similar type (such as physical dimension, electrolyte content and concentration, plate material etc. are same or similar), this relation is substantially the same or similar.Based on this feature, the relation curve filled between capacity and internal resistance of expiring can measuring type belonging to the first and second storage batterys by experiment also stores in a database, so in step 320, device for managing and controlling electrical source 1101 can pass through Query Database, and the accumulator internal resistance according to obtaining in step 310 is determined completely to fill capability value accordingly.
Enter step 330 subsequently, device for managing and controlling electrical source 1101 calculates the degree of aging of the first and second storage battery 130A and 130B.In the present embodiment, the degree of aging A of following formula (1) calculating accumulator can such as be adopted:
Wherein C
sfor described first and second storage batterys fill capacity in expiring of moment t, C
nit is the nominal capacity of the first and second storage batterys.Obviously, higher A value shows that the degree of aging of storage battery is comparatively serious, and vice versa.
Then step 340 is entered, device for managing and controlling electrical source 1101 calculates the gap amount of the degree of aging of first and second storage battery 130A, 130B, and such as, degree of aging by the degree of aging of the first storage battery 130A being deducted the second storage battery 130B obtains this gap amount.But alternatively, the degree of aging value of storage battery can be divided into multiple degree of aging scope, the corresponding centrifugal pump of each scope.Such as degree of aging can be divided into 5 scopes, be called " life termination ", " heavy aging ", " in aging ", " gently aging " and " well ", each scope is endowed centrifugal pump 1,2,3,4 and 5 respectively according to number range order from big to small, make degree of aging lighter, then corresponding centrifugal pump is larger, and vice versa.It is worthy of note, the size being divided scope can be equal, also can not wait, and this depends on the occasion of application.Therefore discrete form is represented to the situation of degree of aging, passable, the degree of aging scope belonging to degree of aging of the storage battery that can first determine according to step 330 gives corresponding centrifugal pump, and then given centrifugal pump is subtracted each other to obtain above-mentioned gap amount.
Subsequently, in step 350, device for managing and controlling electrical source 1101 judges whether the gap amount obtained in above-mentioned steps 340 drops in the scope [A, B] that presets, the wherein endpoint value of this scope of A and B, also i.e. lower limit and the upper limit.If judged result is true, then terminates this process, otherwise enter step 360.
In step 360, device for managing and controlling electrical source 1101 arranges according to the size of gap amount strategy of powering accordingly.In the present embodiment, consider that the second storage battery 130B as starting needs higher degree of protection, its degree of aging should be made to be lighter than the degree of aging of the first storage battery A as far as possible, but the gap of the two can not be made again excessive, therefore be set to asymmetric by the upper and lower bound of the above-mentioned scope preset, wherein the absolute value of the upper limit is less than the absolute value of lower limit.Such as when degree of aging represents with discrete form, the upper limit can be set as 1 and lower limit set is-3, like this, if gap amount E is greater than 1 (also i.e. degree of aging 1 gear lighter than the degree of aging of the second storage battery 130B of the first storage battery 130A or unit value more than), then device for managing and controlling electrical source 1101 by power supply strategy setting be: make the state-of-charge of the second storage battery 130B remain on a preset level (such as 90%) and/or automobile starting at low temp time (when such as ambient temperature is lower than 15 degrees Celsius) by the first and second storage battery 130A, 130B combines and powers to starter 20 and load 40.On the other hand, if gap amount E is less than-3 (also i.e. degree of aging 3 gears lighter than the degree of aging of the first storage battery 130A of the second storage battery 130B or unit value more than), then power supply strategy setting is by device for managing and controlling electrical source 1101: when generator 120 cannot meet the supply load of load 30, combined power to load 30 by first and second storage battery 130A, 130B.
Enter subsequently in step 370, device for managing and controlling electrical source 1101 performs the power supply strategy arranged in step 360.Specifically, remain on a preset level (such as 90%) to make the state-of-charge of the second storage battery 130B, under the control of device for managing and controlling electrical source 1101, first, second and the 3rd switching device K1-K3 disconnect and the 4th switching device K4 close, generator 120 is made to charge to the second storage battery 130B thus, or first, second switch device K1-K2 is closed and the 3rd, 4th switching device K3-K4 disconnects, thus the output of the first storage battery 130A is made DC-to-DC conversion operations to charge to the second storage battery 130B to make the first storage battery 130A, in order to combine power supply when automobile starting at low temp by first and second storage battery 130A, 130B, under the control of device for managing and controlling electrical source 1101, first, second switching device K1-K2 disconnects, three, the 4th switching device K3-K4 closes, and realizes first and second storage battery 130A, 130B thus and powers to starter 20 and load 40, power to load 30 to be combined by first and second storage battery 130A, 130B when generator 120 cannot meet the supply load of load 30, under the control of device for managing and controlling electrical source 1101, second and the 3rd switching device K2-K3 disconnect and first and the 4th switching device K1, K4 close, set up the supplying channels of first and second storage battery 130A, 130B to load 30 thus.
the measurement of accumulator internal resistance
The method of measurement of accumulator internal resistance is below described.Generally speaking, the impedance Z of storage battery can be expressed as follows:
Z＝Z
++Z
-+R
ohm(2)
Wherein, Z
+and Z
-represent both positive and negative polarity impedance respectively, R
ohmrepresent ohmage.
Battery impedance is a complex impedance, relevant to test frequency, and alternating current method therefore can be adopted to measure the internal resistance of storage battery.
Because the internal resistance of cell is milliohm level, in order to prevent larger error, normal employing four-line measurement mode, that is, when measuring, two terminals apply the alternating constant electric excitation current signal of certain frequencies, and another two terminals are used for measuring.In actual applications, because FD feed is fainter, be easily interfered, for this reason, the present inventor spy proposes the circuit shown in Fig. 4 and overcomes interference signal.
As shown in Figure 4, this circuit comprises controlled current source 410, exchanges amplifying unit 420, synchronous detection unit 430, low-pass filter unit 440 and control unit 450.Controlled current source 410 applies constant alternating current driver signal by two terminals at the two ends of storage battery 500, exchange amplifying unit 420 to amplify for the voltage signal produced storage battery 500, the amplifying signal exchanging amplifying unit 420 is multiplied with rectified signal by synchronous detection unit 430.In the circuit shown in Fig. 4, control unit 450 is coupled with controlled current source 410 and synchronous detection unit 430, provides clock signal with synchronization motivationtheory signal and rectified signal to them.Low-pass filter unit 440 makes low-pass filtering treatment to the signal after detection.
The principle utilizing foregoing circuit to measure accumulator internal resistance is below described.
Suppose that the operating current I of the controlled current source 410 and response voltage U of storage battery 500 is respectively:
I＝I
maxSin(ωt)(3)
Wherein, I and U is respectively the amplitude of operating current and response voltage, and ω is the frequency of alternating current driver signal,
for the phase difference between pumping signal and response signal.
Thus, the impedance Z of storage battery can be expressed as:
Therefore the ohmage of storage battery is:
In addition, suppose to exchange the signal amplification factor of amplifying unit 420 be K doubly, rectified signal and pumping signal are with frequency and be expressed as Esin (ω t), and wherein E is the amplitude of rectified signal, then the battery voltage measuring signal after synchronous detection is:
After low-pass filtering treatment, the size of battery voltage measuring signal is:
The ohmic internal resistance R that comprehensive above formula (6) and (8) then can obtain storage battery is:
Due to multiplication factor K, synchronous detection signal amplitude E and excitation signal amplitude I
maxbe known quantity and by measuring the battery voltage measuring signal after obtaining low-pass filtering treatment, therefore can determine the internal resistance R of storage battery through computing.Accumulator internal resistance measurement method based on above-mentioned principle has plurality of advantages such as realizing simply, precision is high, real time response speed is fast.
Due to can under the spirit not deviating from essential characteristic of the present invention, implement the present invention in a variety of manners, therefore present embodiment is illustrative and not restrictive, because scope of the present invention is defined by claims, instead of defined by specification, therefore fall into all changes in the border of claim and boundary, or thus the equivalent of this claim border and boundary is forgiven by claim.
Claims (8)
1. the balance control method of the storage battery degree of aging in an automobile power supply system, described automobile power supply system comprises generator and is coupled to form the first storage battery of current supply circuit and starter parallel coupled with the second storage battery forming starting-up later time and the control unit be controllably coupling between described current supply circuit and described starting-up later time with described parallel operation of generator, wherein, the following step is comprised:
Described control unit determines the degree of aging of described first and second storage batterys;
Described control unit determines the gap amount of the degree of aging of described first and second storage batterys;
If the gap amount of the degree of aging of described first and second storage batterys departs from the scope preset, then described control unit is by adopting corresponding power supply strategy to make the degree of aging of described first and second storage batterys reach unanimity,
Wherein, described in the upper and lower bound of scope that presets be asymmetrical,
Wherein, described control unit according to following manner, by adopting corresponding power supply strategy to make the degree of aging of described first and second storage batterys reach unanimity:
If described gap amount exceeds the upper limit of described preset range, then described control unit makes the state-of-charge of described second storage battery remain on a preset level; If described gap amount exceeds the lower limit of described preset range, then, when the power consumption equipment of automobile needs storage battery power supply, described control unit makes described first and second storage batterys power simultaneously.
2. the method for claim 1, wherein described control unit determines the degree of aging A of described first and second storage batterys according to the following formula:
Wherein, C
st () completely fills capacity at moment t, C for described first and second storage batterys
nit is the nominal capacity of the first and second storage batterys.
3. method as claimed in claim 2, wherein, described first and second storage batterys completely fill capacity C at moment t
st () is by measuring the internal resistance of described first and second storage batterys and determining according to predetermined internal resistance-relation of completely filling between capacity.
4. method as claimed in claim 3, wherein, the internal resistance of described first and second storage batterys adopts alternating current method to record.
5. the method for claim 1, wherein described degree of aging is divided into multiple scope, the corresponding centrifugal pump of each scope, and described control unit determines the gap amount of the degree of aging of described first and second storage batterys according to following manner:
According to the large young pathbreaker of the degree of aging of described first and second storage batterys, it is mapped as corresponding centrifugal pump; And
The centrifugal pump of the degree of aging of described first and second storage batterys is subtracted each other to determine described gap amount.
6. method as claimed in claim 5, wherein, the quantity of described scope is five, gives centrifugal pump 1,2,3,4 and 5 respectively according to order from big to small.
7. method as claimed in claim 6, wherein, described control unit makes the state-of-charge of described second storage battery remain on a preset level according to following manner:
When the state-of-charge of described second storage battery is less than described preset level, if automobile is in transport condition and the power supply capacity of described generator is greater than the power load of automobile, then described control unit makes described generator to described second charge in batteries until the state-of-charge of described second storage battery reaches described preset level, otherwise described control unit makes described first storage battery to described second charge in batteries until the state-of-charge of described second storage battery reaches described preset level.
8. the method for claim 1, wherein described control unit according to following manner, by adopting corresponding power supply strategy to make the degree of aging of described first and second storage batterys reach unanimity:
Prescribe a time limit when described gap amount exceeds the upper of described preset range, if ambient temperature is lower than a preset value, then when automobile starting, described control unit makes described first and second storage batterys power to described starter simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110126121.7A CN102790240B (en) | 2011-05-16 | 2011-05-16 | The balance control method of the storage battery degree of aging in automobile power supply system |
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| WO2014083756A1 (en) * | 2012-11-28 | 2014-06-05 | ソニー株式会社 | Control apparatus, control method, power supply system, and electric vehicle |
| CN103226065B (en) * | 2013-04-10 | 2015-04-15 | 苏州市职业大学 | Intelligent automobile performance monitoring system based on onboard automatic diagnosis system |
| CN107696898B (en) * | 2017-10-17 | 2019-11-29 | 北京普莱德新能源电池科技有限公司 | A kind of electrokinetic cell system and electric vehicle using charging complete equilibrium |
| CN109585948B (en) * | 2018-12-06 | 2021-11-23 | 重庆西南集成电路设计有限责任公司 | Distributed detection system and method for automobile lithium battery cell and measurement module |
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| CN1402375A (en) * | 2002-04-04 | 2003-03-12 | 北京航空航天大学 | Method and device for automatic equilization of charge-and-dischage based on cell dynamic electricity different compensation |
| CN101544196A (en) * | 2008-03-27 | 2009-09-30 | 福特环球技术公司 | Dual battery vehicle electrical systems |
| CN201317281Y (en) * | 2008-12-16 | 2009-09-30 | 上海通用汽车有限公司 | Vehicle electrical system |
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| CN1402375A (en) * | 2002-04-04 | 2003-03-12 | 北京航空航天大学 | Method and device for automatic equilization of charge-and-dischage based on cell dynamic electricity different compensation |
| CN101544196A (en) * | 2008-03-27 | 2009-09-30 | 福特环球技术公司 | Dual battery vehicle electrical systems |
| CN201317281Y (en) * | 2008-12-16 | 2009-09-30 | 上海通用汽车有限公司 | Vehicle electrical system |
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