CN202512219U - Storage battery state detection device - Google Patents

Abstract

The utility model provides a storage battery state detection device, which comprises a storage battery, a power generation device connected with the storage battery in parallel and having a power generation current feedback function, and an electric load connected with the storage battery through a switch, and further comprises a power generation current detection device, a voltage detection device, a load detection device and a storage battery state determination device. The storage battery state detection device provided by the utility model only needs to detect the output characteristics of a generator of a finished vehicle, the electric state of the finished vehicle and the voltage of the storage battery for determining the state of the storage battery, with no need for precise and direct detection of the current of the storage battery. In addition, the storage battery state detection device of the utility model is simple in structure and easy to implement, and meanwhile can reduce the cost.

Description

A kind of battery condition pick-up unit

Technical field

The utility model relates to the battery condition detection range, particularly a kind of automobile starter storage battery status detection device.

Background technology

At present, have engine idle start and stop control system on many vehicles, on off controller need know whether the current state of accumulator satisfies the requirement that next time starts.Generally speaking; Following apparatus is proposed as the condition checkout gear of automobile starting with lead-acid accumulator; Promptly by the voltage table that is connected to lead-acid accumulator, be concatenated into reometer on the electric power storage negative line, be installed in thermometer and an arithmetic and control unit unit on the battery terminal negative post and constitute electrical quantity sensor and form.Wherein, voltage table is used for measuring the voltage of accumulator, and reometer is used for measuring the electric current through accumulator, and thermometer is used for detecting the temperature of battery terminal negative post, and by the temperature of this temperature indirect calculation battery liquid.

Usually, the equivalent electric charge variation delta Q of accumulators store is definite by formula 1,

$\mathrm{\ΔQ}={\mathrm{\Σ}}_{\mathrm{\τ}=0}^{\∞}\mathrm{\αi}\left(t\right)---\left(1\right)$

Promptly confirm the change in charge situation of accumulators store through the amount of charge of measuring inflow and outflow accumulator; Confirm SOC (the state of charge of accumulator then through the initial charge amount, voltage and the temperature parameter that combine accumulator; State-of-charge), the SOH of accumulator (State of Health; Health status) and the SOF of accumulator (state of function, functional status).Thereby judge the state of accumulator.

But this method needs accurately to detect to flow through the electric current of accumulator and add up computing.Because there is error in current detecting, and this error can add up always, and time one length can make the result produce bigger deviation.Simultaneously because the current margin of automobile storage battery is very big, the sensing range that needs sensor from several milliamperes to hundreds of peaces, and accuracy of detection requires quite highly, need reach a milliampere level, so current sensing means is quite complicated, realizes that cost is quite high.

The utility model content

The utility model is intended to solve at least the technical matters that exists in the prior art, has proposed to special innovation a kind of battery condition pick-up unit.

In order to realize the above-mentioned purpose of the utility model; The utility model provides a kind of battery condition pick-up unit, and it comprises accumulator, the TRT with generation current feedback function parallelly connected with said accumulator; Use electric loading through what switch was connected with said accumulator; This battery condition pick-up unit also comprises: the generation current pick-up unit, and said generation current pick-up unit is connected with said TRT, is used to detect said TRT generation current; Voltage check device, said voltage check device is connected with said TRT with said accumulator, is used to detect the WV of said accumulator; Weight detector, said Weight detector links to each other with electric loading with said, is used to detect said on-state and load current with electric loading; And battery condition decision maker; Said battery condition decision maker links to each other with said generation current pick-up unit, said voltage check device and said Weight detector respectively; The TRT generation current that said battery condition decision maker detects according to said generation current pick-up unit, the said state of judging accumulator with the load current of electric loading that the WV of the said accumulator that said voltage check device detects and said Weight detector detect.

The battery condition pick-up unit of the utility model does not need accurately directly to detect the electric current of accumulator; Only need be to the output characteristics of car load generator, car load use electricity condition, and the voltage of accumulator detects the state that just can confirm accumulator; In addition; The utility model battery condition pick-up unit is simple in structure, is easy to realize, can reduce cost simultaneously.

Additional aspect of the utility model and advantage part in the following description provide, and part will become obviously from the following description, or recognize through the practice of the utility model.

Description of drawings

Above-mentioned and/or additional aspect of the utility model and advantage are from obviously with easily understanding becoming the description of embodiment in conjunction with figs, wherein:

Fig. 1 is the structural representation of the utility model battery condition pick-up unit;

Fig. 2 is the process flow diagram of the detection method of the utility model battery condition pick-up unit;

Fig. 3 is the process flow diagram of SOC predictor of the detection method of the utility model battery condition pick-up unit;

Fig. 4 is the process flow diagram of state of saturation SOC calibration procedure of the detection method of the utility model battery condition pick-up unit;

Fig. 5 is the process flow diagram of startup pressure drop calibration procedure of the detection method of the utility model battery condition pick-up unit;

Fig. 6 is the process flow diagram of battery condition decision procedure of the detection method of the utility model battery condition pick-up unit.

Embodiment

Describe the embodiment of the utility model below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the utility model, and can not be interpreted as restriction the utility model.

In the description of the utility model, unless otherwise prescribed and limit, need to prove; Term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection; Also can be the connection of two element internals, can be directly to link to each other, and also can link to each other indirectly through intermediary; For those of ordinary skill in the art, can understand the concrete implication of above-mentioned term as the case may be.

The accumulator electric-quantity that the utility model battery condition decision maker is mainly used in automobile start and stop control system detects; Because this system will know whether the electric weight of accumulator can satisfy and accomplish starting engine next time, promptly the accumulator functional status SOF that confirms of battery condition decision maker is: electric weight satisfies accomplishes starting engine next time.Can confirm that thus this system is not high to the accuracy requirement of the state-of-charge SOC of accumulator, all the utility model battery condition decision makers have adopted predicted method to confirm the SOC of accumulator, and the SOC that this method is confirmed is enough to satisfy the needs of confirming SOF.Native system is through charging and discharging of accumulator characteristic and charge and discharge cycles number of times being confirmed the health status SOH of accumulator.

Fig. 1 shows the structural representation of the utility model battery condition pick-up unit; Visible from figure, the utility model battery condition pick-up unit comprises accumulator, the TRT with generation current feedback function parallelly connected with this accumulator; Use electric loading through what switch was connected with accumulator; And the generation current pick-up unit, this generation current pick-up unit is connected with said TRT, is used to detect the TRT generation current; Also comprise voltage check device, this voltage check device is connected with said TRT with said accumulator, is used to detect the WV of accumulator; Weight detector, this Weight detector links to each other with electric loading with said, is used for the on-state and the load current of detection load; This battery condition pick-up unit also comprises the battery condition decision maker; This battery condition decision maker links to each other with generation current pick-up unit, voltage check device and Weight detector respectively; The TRT generation current that this battery condition decision maker detects according to said generation current pick-up unit, the load current of the usefulness electric loading that the WV of the accumulator that voltage check device detects and Weight detector detect is judged the state of accumulator.

In this embodiment, accumulator is that vehicle launch is used lead-acid accumulator, and this battery condition pick-up unit also comprises pilot lamp, and this pilot lamp links to each other with the battery condition decision maker, is used to indicate the state of said accumulator.

In this embodiment, use electric loading to be N, wherein, N is a positive integer; X is individual to be connected with accumulator through switch S x with electric loading, and x the conducting state with electric loading represented with STx, when switch S x closure, when load is connected; STx=1, when switch S x disconnection, when load is broken off, STx=0; Said x=1,2 ..., N.

The utility model also provides a kind of detection method to the battery condition pick-up unit, and as shown in Figure 2, it comprises the steps:

The first step: the battery condition pick-up unit powers on, and starts working;

Second step: carry out input, this input comprises that the generation current pick-up unit detects rotor machine generation current I ₁, Weight detector detects load current I ₂And voltage check device detects the WV V of said accumulator ₁

The 3rd step: operation SOC predictor; Operation state of saturation SOC calibration procedure and operation start the pressure drop calibration procedure; This SOC predictor is used for SOC is predicted; This state of saturation SOC calibration procedure is used to eliminate the influence that deviation that deviation that the current measurement precision causes, deviation that load variations causes and voltage fluctuation cause is judged SOC, and this startup pressure drop calibration procedure carries out the condition judgement of accumulator through battery tension and battery tension rate of change;

The 4th step: operation battery condition decision procedure, this battery condition decision procedure is used for confirming state-of-charge SOC, functional status SOF and the health status SOH of accumulator;

The 5th step: finish.

As shown in Figure 1, the utility model accumulator and TRT are connected in parallel, battery-operated voltage V ₁Measurement accomplish by voltage check device, when accumulator is in charged state, the WV V of accumulator ₁Output voltage for TRT; When accumulator is in discharge condition, the WV V of accumulator ₁Output voltage for accumulator.

Rotor machine generation current I ₁Measurement accomplish by the generation current pick-up unit, the steps include:

The first step: the generation current pick-up unit is measured the generation current signal PWM of TRT feedback; The frequency and the dutycycle of the exciting current of this pwm signal and TRT are consistent; Because exciting current and generation current have a definite corresponding relation, so this signal can calculate the TRT generation current;

Second step: then,, calculate TRT generation current I according to formula (2) according to generation current signal PWM ₁, wherein, the relation of f (PWM) is determined by the characteristic of TRT, and demarcates through experimental data.

I ₁＝f(PWM) (2)

Load current I ₂Detection accomplish by Weight detector, Weight detector detects load current I ₂Step be:

The first step: Weight detector detects the on-state ST of each load _x, x=1,2 ..., N, wherein, N is a positive integer, ST when load is connected _x=1, ST during disconnection _x=0;

Second step: because the usefulness electrical load power major part on the automobile all fixes, and the battery condition decision method of the utility model do not need the working current of accurate detection load, confirms load current I according to formula (3) ₂,

$I_2=\underset{x=1}{\overset{N}{\mathrm{\Σ}}}{\mathrm{ST}}_x\×f(i_x,V_1)---\left(3\right)$

Wherein, i _xBe x electric current with electric loading, f (i _x, V ₁) be current i _xWith WV V ₁Variation relation, i _xAnd f (i _x, V ₁) demarcate by the characteristic decision of this usefulness electric loading and through test figure.

As shown in Figure 3, the SOC predictor comprises the steps:

The first step: the SOC predictor starts;

Second step: the battery condition decision maker is according to the working current I of formula (4) calculating accumulator ₀,

I ₀＝I ₁-I ₂ (4)；

The 3rd step: calculate I respectively according to formula (5) and formula (6) then ₀Greatest limit deviation I ₀Max and least limit deviation I ₀Min, wherein I ₁Max is electric installation generation current I ₁Considered the maximum limit of system deviation, I ₁Min is electric installation generation current I ₁Considered the minimum limit value of system deviation, I ₂Max is load current I ₂Considered the maximum limit of system deviation, I ₂Min is load current I ₂Considered the minimum limit value of system deviation, I ₁Max, I ₁Min, I ₂Max, I ₂Min confirms through test during by system calibrating;

I ₀max＝I ₁max-I ₂min (5)

I ₀min＝I ₁min-I ₂max (6)

The 4th step: judged whether I ₀I is worked as in min＞0 ₀Min＞0 o'clock, accumulator is in charged state, the system works voltage V under the battery condition decision maker record battery state of charge ₃, with I ₀Min is that charging current is carried out electric weight accumulation computing;

The 5th step: work as I ₀Min＜0 o'clock has judged whether I ₀I is worked as in max＜0 ₀Max＜0 o'clock, accumulator is in discharge condition, the WV V of system under the battery condition decision maker record battery discharging state ₂, with I ₀Max is that discharge current carries out electric weight accumulation computing;

The 6th step: when the 4th step set up, according to the system works voltage V under the battery state of charge ₃Calculate reference voltage V _REF, when the 5th step set up, according to the WV V of system under the battery discharging state ₂Calculate reference voltage V _REFIf the 4th step and the 5th step all are false, and do not have the system works voltage V of storage ₂Or V ₃, then the battery condition decision maker calculates according to the operational voltage value of setting, and computing formula is:

V _REF＝f(V ₂、V ₃) (7)

Wherein, f (V ₂, V ₃) relation confirm through experiment;

The 7th step: work as I ₀Min＜0 is I simultaneously ₀The battery-operated electric current I can not be passed through in max＞0 o'clock ₀Confirm that accumulator is to carry out charge or discharge with great electric current, this moment is through the WV V of accumulator ₁With reference voltage V _REFCalculate the reference charge electric current I according to formula (8) ₀Ref,

I ₀ref＝f(V ₁，V _REF) (8)

Wherein, f (V ₁, V _REF) relation confirm by experiment during by system calibrating, then according to battery-operated voltage V ₁Confirm that accumulator is in charging or discharge condition, the WV V of accumulator ₁＞V _SETThe time, show system in charging, otherwise work as V ₁＜V _SETThe time, show that then accumulator is at discharge, V _SETBattery-operated voltage setting value during for system design is after definite accumulator is in charging or discharge condition, with the reference charge electric current I ₀The size of ref is carried out electric weight accumulation computing;

The 8th step: carry out the prediction of SOC according to electric weight accumulation operation result, and prediction of output value SOC ₁, the SOC predicted value SOC definite according to top method ₁With being less than or equal to actual SOC value all the time, the reliability of systemic-function has been guaranteed in such processing;

The 9th step: finish.

State of saturation SOC calibration procedure will eliminate because the influence that the deviation that the deviation that causes of current measurement precision, deviation that load variations causes and voltage fluctuation cause is judged battery condition, and as shown in Figure 4, state of saturation SOC calibration procedure comprises the steps:

The first step: state of saturation SOC calibration procedure starts;

Second step: the battery condition decision maker increases by 1 with the counter values in it, i.e. N=N+1;

The 3rd step: calculate current accumulator dynamic duty electric current I according to formula (9) then ₀(N), and store this current value,

I ₀(N)＝I ₁(N)-I ₂(N) (9)；

The 4th step: then to accumulator dynamic duty electric current I ₀(N) differentiate to eliminate the deviation that current measurement causes, obtain the charge in batteries electric current first rate of change Δ I ₀1 (N), its principle is, according to the deviate basically constant characteristic of this current measuring method in twice extremely short measurement at interval, the value of twice measurement subtracted each other, can deviate be eliminated, this reacting condition the SOC state of accumulator.

The 5th step: through type (10) is to the charge in batteries electric current first rate of change Δ I ₀1 (N) carries out low-pass filtering treatment, eliminates the deviation that load variations causes, obtains the charge in batteries electric current second rate of change Δ I ₀2 (N);

ΔI ₀2(N)＝f1(ΔI ₀1(N)) (10)

The 6th step: then according to formula (11) calculating accumulator WV V ₁Twice measured deviation value Δ V ₁(N), this deviation will be used for correcting current rate of change Δ I ₀(N);

ΔV ₁(N)＝V ₁(N)-V ₁(N-1) (11)

The 7th step: utilize the charge in batteries electric current second rate of change Δ I ₀2 (N) and battery-operated voltage V ₁Twice measured deviation value Δ V ₁(N) revise, modification method obtains charge in batteries current changing rate Δ I suc as formula shown in (12) ₀(N);

ΔI ₀(N)＝f2(ΔI ₀2(N)、ΔV ₁(N)) (12)

Wherein, f2 (Δ I ₀2 (N), Δ V ₁(N)) concrete grammar is confirmed by experimental data.

The 8th step: the battery condition decision maker judges that whether accumulator is in charged state, when accumulator is in charged state, has judged whether | Δ I ₀(N) |＜Δ I _0SET, when | Δ I ₀(N) |＜Δ I _0SETThe time, then accumulator state of saturation SOC calibration, accumulator state of saturation calibrating signal ST _SOC=1, Δ I _0SETSetting value for the charge in batteries current changing rate;

The 9th step: if accumulator is not to be in charged state, perhaps | Δ I ₀(N) |＜Δ I _0SETBe false, then accumulator state of saturation SOC does not calibrate, accumulator state of saturation calibrating signal ST _SOC=0;

The tenth step: finish.

Starting the pressure drop calibration procedure is the condition judgement that carries out accumulator through battery tension and battery tension rate of change, and major function is starting state identification and number of starts record and starts the characteristic parameter record.As shown in Figure 5, the flow process that starts the pressure drop calibration procedure comprises the steps:

The first step: start the pressure drop calibration procedure and start;

Second step: the battery condition decision maker increases by 1 with the counter values in it, i.e. N=N+1;

The 3rd step: store current battery-operated voltage V ₁(N), V ₁(N)=V ₁

The 4th step: then according to formula (13) calculating accumulator WV V ₁Twice measured deviation value Δ V ₁(N), this voltage difference has reacted the rate of change of battery tension,

ΔV ₁(N)＝V ₁(N)-V ₁(N-1) (13)

The 5th step: according to battery-operated voltage deviation value Δ V ₁(N) and battery-operated voltage V ₁(N) identification start-up course is as Δ V ₁(N)＞Δ V _1SETAnd V ₁(N)＜V _1SETThe time be identified as start-up course, wherein, Δ V _1SETBe the setting value of battery-operated voltage change ratio, V _1SETBe the setting value of battery-operated voltage, Δ V _1SETAnd V _1SETIn experiment, confirm according to experimental data;

The 6th step: if do not recognize start-up course, returned for the 3rd step, after recognizing start-up course, with number of starts N _STIncrease by 1 also storage;

The 7th step: calculate and storage start-up course character voltage V _ST, this value is through the battery-operated voltage V in the whole start-up course ₁(N) calculate, its physical significance is for starting pressure drop;

The 8th step: finish.

The function of battery condition decision procedure is according to prediction SOC value SOC ₁, accumulator state of saturation calibrating signal ST _SOC, number of starts N _ST, start characteristic parameter V _STConfirm accumulator state-of-charge SOC, functional status SOF, health status SOH etc. parameter.As shown in Figure 6, the battery condition decision procedure comprises the steps:

The first step: the battery condition decision procedure starts;

Second step: confirm the state-of-charge SOC of accumulator, relatively the predicted value SOC of state-of-charge SOC ₁Setting value SOC with SOC _SET, judged whether SOC ₁＞SOC _SET, while accumulator state of saturation calibrating signal ST _SOC=1, work as SOC ₁＞SOC _SETAnd ST is arranged _SOC, the value of the SOC of accumulator is made as SOC=100%, simultaneously predicted value SOC at=1 o'clock ₁Be made as 100%, work as SOC ₁＞SOC _SETBe false or accumulator state of saturation calibrating signal ST _SOCBe not equal at 1 o'clock, the SOC value of accumulator is made as SOC=SOC ₁, wherein, SOC _SETConfirm through experiment parameter during by system calibrating.

The 3rd step: confirm the health status SOH of accumulator, as the state-of-charge SOC＞SOC of accumulator _STAnd start-up course character voltage V _ST＜V _STSETThe time, the health status of accumulator is bad, and SOH=0 is as the state-of-charge SOC＜SOC of accumulator _STPerhaps start-up course character voltage V _ST＞V _STSETThe time, the health status of accumulator is good, SOH=1, wherein, SOC _STBe the setting value of the state-of-charge of accumulator, V _STSETBe the setting value of start-up course character voltage, SOC _STAnd V _STSETSize confirm through test at timing signal;

The 4th step: confirm the functional status SOF of accumulator, as SOC＞SOC _SOFAnd during SOH=1, accumulator functional status SOF satisfies functional requirement, and SOF=1 is as SOC＜SOC _SOFPerhaps SOH is not equal at 1 o'clock, and accumulator functional status SOF does not satisfy functional requirement, SOF=0, wherein, SOC _SOFFor the setting value of accumulator state-of-charge when confirming the accumulator functional status, confirm through test figure during by system calibrating;

The 5th step: finish.

In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means the concrete characteristic, structure, material or the characteristics that combine this embodiment or example to describe and is contained among at least one embodiment or example of the utility model.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete characteristic, structure, material or the characteristics of description can combine with suitable manner in any one or more embodiment or example.

Although illustrated and described the embodiment of the utility model; Those having ordinary skill in the art will appreciate that: under the situation of principle that does not break away from the utility model and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, the scope of the utility model is limited claim and equivalent thereof.

Claims (3)

1. a battery condition pick-up unit comprises accumulator, and the TRT with generation current feedback function parallelly connected with said accumulator used electric loading through what switch was connected with said accumulator, it is characterized in that, also comprises:

The generation current pick-up unit, said generation current pick-up unit is connected with said TRT, is used to detect said TRT generation current;

Voltage check device, said voltage check device is connected with said TRT with said accumulator, is used to detect the WV of said accumulator;

Weight detector, said Weight detector links to each other with electric loading with said, is used to detect said on-state and load current with electric loading; And

The battery condition decision maker; Said battery condition decision maker links to each other with said generation current pick-up unit, said voltage check device and said Weight detector respectively; The TRT generation current that said battery condition decision maker detects according to said generation current pick-up unit, the said state of judging accumulator with the load current of electric loading that the WV of the said accumulator that said voltage check device detects and said Weight detector detect.

2. battery condition pick-up unit as claimed in claim 1 is characterized in that, also comprises pilot lamp, and said pilot lamp links to each other with said battery condition decision maker, is used to indicate the state of said accumulator.

3. battery condition pick-up unit as claimed in claim 1 is characterized in that, the said electric loading of using is N, and said N is a positive integer; Said x is individual to be connected with said accumulator through switch S x with electric loading, and said x the conducting state with electric loading represented with STx, when switch S x closure, when load is connected; STx=1, when switch S x disconnection, when load is broken off, STx=0; Said x=1,2 ..., N.

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