IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0537806
(2003-10-16)
|
등록번호 |
US-7332892
(2008-02-19)
|
우선권정보 |
DE-102 57 588(2002-12-09) |
국제출원번호 |
PCT/EP03/011484
(2003-10-16)
|
§371/§102 date |
20050720
(20050720)
|
국제공개번호 |
WO04/053509
(2004-06-24)
|
발명자
/ 주소 |
- Bopp,Richard
- Kl��pfer,Armin
|
출원인 / 주소 |
|
대리인 / 주소 |
Fitch Even Tabin & Flannery
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
11 |
초록
▼
The present invention discloses a method for predicting the voltage of a battery, in particular a vehicle battery. The method according to the invention makes it possible to predict a voltage drop before it actually occurs as a result of a load. For this purpose, a filtered battery voltage and a fil
The present invention discloses a method for predicting the voltage of a battery, in particular a vehicle battery. The method according to the invention makes it possible to predict a voltage drop before it actually occurs as a result of a load. For this purpose, a filtered battery voltage and a filtered battery current are first of all determined from battery data, such as the battery voltage, the battery current, the battery temperature and the dynamic internal resistance. The resistive voltage drop across the dynamic internal resistance is determined from the difference current between the filtered battery current and the predetermined load current. Furthermore, a polarization voltage is calculated as a function of the filtered battery current, and is then filtered. The predicted battery voltage is calculated from the filtered battery voltage, minus the resistive voltage drop and the filtered polarization voltage. A decision on further measures can be made on the basis of this predicted battery voltage.
대표청구항
▼
The invention claimed is: 1. A method for predicting the voltage of a battery, having the following steps: (S1) determining and checking battery data, by detection and calculation devices, with the battery data comprising a battery voltage (U_batt), a battery current (I_batt), a battery temperature
The invention claimed is: 1. A method for predicting the voltage of a battery, having the following steps: (S1) determining and checking battery data, by detection and calculation devices, with the battery data comprising a battery voltage (U_batt), a battery current (I_batt), a battery temperature (T_batt) and a dynamic internal resistance (Rdi), (S2) checking whether present functional procedure is a first procedure, (S3) if the result in step S2 is that a functional procedure has already been carried out, checking whether a predetermined time (Tx) has elapsed, and, if the predetermined time has not yet elapsed, returning to step S1, (S4) if the predetermined time (Tx) has elapsed, filtering of the battery voltage (U_batt) and of the battery current (I_batt) using a low-pass filter, and emission of a filtered battery voltage (U_filt) and of a filtered battery current (I_filt), (S5) checking whether the filtered battery current (I_filt) is greater than a predetermined load (I_pred) minus a tolerance (Tol), and whether the battery current (I_batt) is greater than a predetermined load current (I_pred) minus the tolerance (Tol) and, if the conditions are not satisfied, returning to step S1, (S6) calculation of a resistive voltage drop (U_ri) across the dynamic internal resistance (Rdi), (S7) calculation of a polarization voltage (U_pol) as a function of the filtered battery current (I_batt_filt), (S8) filtering of the polarization voltage (U_pol), using two low-pass filters separately on the basis of a fast settling component (U_pol_fast_raw) and a slowly settling component (U_pol_slow_raw) and emission of a filtered polarization voltage (U_pol_filt), (S9) calculation of a predicted battery voltage by subtracting the resistive voltage drop (U_ri) and the filtered polarization voltage (U_pol_filt) from the filtered battery voltage (U_batt_filt), (S10) limiting of the predicted battery voltage (U_pred) determined in step S9 upwards and downwards, (S11) filtering of the predicted battery voltage (U_pred), and (S12) checking whether the a bit which indicates that a first function call has been carried out is set and, if not, setting the bit and returning to step S1, or, if yes, returning to step S1. 2. The method for predicting the voltage of a battery as claimed in claim 1, wherein the dynamic internal resistance (Rdi) is determined by means of an algorithm. 3. The method for predicting the voltage of a battery as claimed in claim 1, wherein the predetermined time (Tx) in step S3 is 500 ms. 4. The method for predicting the voltage of a battery as claimed in claim 1, wherein the filtered battery voltage (U_filt) and the filtered battery current (I_filt) are obtained from the following equations: description="In-line Formulae" end="lead"U_filt(tn)=(U_batt-U_filt (tn-1))*(1 exp(-t/T))++U_filt(t1)description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"l_filt(tn)=(I_batt-I_filt (tn-1))*(1 exp(-t/T))++I_filt(tn-1)description="In-line Formulae" end="tail" where T is a filter constant for the low pass filter utilized, t is an interval in which a value record is in each case read and tn is the actual time, while tn-1 is the time of the last calculation. 5. The method for predicting the voltage of a battery as claimed in claim 1, wherein steps S3 and S4 are jumped over and the method proceeds directly to step S5 if a first functional procedure directly after a start of the method is detected in step S2. 6. The method for predicting the voltage of a battery as claimed in claim 1, wherein the tolerance (Tol) is chosen to be 5A. 7. The method for predicting the voltage of a battery as claimed in claim 1, wherein the resistive voltage drop is calculated using the following equation: description="In-line Formulae" end="lead"U_ri=(I_filt-I_pred) *Rdi.description="In-line Formulae" end="tail" 8. The method for predicting the voltage of a battery as claimed in claim 1, wherein the polarization voltage (U_pol) is calculated taking into account the stated conditions using the following equations: description="In-line Formulae" end="lead"If I_filt>0:description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"U_pol=(U_pol0+(ki_lad*I_filt/( ik_lad+I_filt)))**K1.description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"If I_fil≦0:description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"U_pol=(U_pol--0+(ki_ela*I _filt/(ik_ela-I_filt)))**K1,description="In-line Formulae" end="tail" where K is a correction factor which is dependent on the predetermined load (I_pred), and parameters U_pol--0, ki_lad, ik_lad ki_ela and ik_ela are predetermined parameters which have been determined empirically, and ki_ela can be defined such that the value of the polarization voltage (U_pol) is 0 V if the filtered battery current (I_filt) is equal to the predetermined load current (I_pred). 9. The method for predicting the voltage of a battery as claimed in claim 1, wherein the polarization voltage (U_pol) has a fast settling component (U_pol_fast_raw) and a slowly settling component (U_pol_slow_raw), with the fast settling component (U_pol_fast_raw) making up 60% of the polarization voltage (U_pol) and the slowly settling component (U_pol_slow_raw) making up 40% of the polarization voltage (U_pol), and each of these two components being filtered by a low-pass filter in step S8, thus resulting in the following equations: and the overall filtered polarization voltage (U_pol_filt) is obtained by addition of the two filtered components of the polarization voltage (U_pol_fast_filt, U_pol_slow_filt). 10. The method for predicting the voltage of the battery as claimed in claim 8, wherein the correction factor K1 is unity when the predetermined load current (I_pred) is-100 A, while it is obtained from (1-(I_pred+100)/100*0.2) for a predetermined load current (I_pred) between-80 A and-150 A.
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