IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0808277
(2008-12-16)
|
등록번호 |
US-8194367
(2012-06-05)
|
우선권정보 |
JP-2007-325564 (2007-12-18) |
국제출원번호 |
PCT/JP2008/003780
(2008-12-16)
|
§371/§102 date |
20100615
(20100615)
|
국제공개번호 |
WO2009/078167
(2009-06-25)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
2 |
초록
▼
When an electricity storage unit is being charged or discharged, a control circuit obtains efficiency Efn of a DC/DC converter based on input/output voltage value Vi, input/output current value I and electricity storage unit voltage value Vc detected by an input/output voltage detection circuit, an
When an electricity storage unit is being charged or discharged, a control circuit obtains efficiency Efn of a DC/DC converter based on input/output voltage value Vi, input/output current value I and electricity storage unit voltage value Vc detected by an input/output voltage detection circuit, an input/output current detection circuit, and an electricity storage unit voltage detection circuit, respectively. By using temperature T a detected by temperature sensor, when efficiency Efn lies out of predetermined range (from Emin to Emax) according to input/output voltage value Vi, input/output current value I, electricity storage unit voltage value Vc and temperature T, at least any one of an electricity storage unit and the DC/DC converter is determined to be abnormal.
대표청구항
▼
1. An electricity storage device storing power generated from a generator, comprising: an electricity storage unit;a DC/DC converter having an electricity storage unit terminal connected to the electricity storage unit and an input/output terminal configured to be connected to the generator;an elect
1. An electricity storage device storing power generated from a generator, comprising: an electricity storage unit;a DC/DC converter having an electricity storage unit terminal connected to the electricity storage unit and an input/output terminal configured to be connected to the generator;an electricity storage unit voltage detection circuit configured to detect a voltage value of the electricity storage unit from the electricity storage unit terminal;an input/output voltage detection circuit configured to detect a voltage value of power input to and output from the DC/DC converter from the input/output terminal;an input/output current detection circuit configured to detect a current value of power input to and output from the DC/DC converter; anda control circuit,wherein the control circuit calculates an efficiency of the DC/DC converter when the DC/DC converter carries current, by use of an input and output power amount for the DC/DC converter calculated based on the voltage value detected by the input/output voltage detection circuit and the current value detected by the input/output current detection circuit, and a power amount for the electricity storage unit calculated based on the voltage value detected by the electricity storage unit voltage detection circuit and a capacitance value of the electricity storage unit; determines the electricity storage unit and the DC/DC converter to be normal when the efficiency lies in a predetermined range; and determines at least one of the electricity storage unit and the DC/DC converter to be abnormal when the efficiency lies out of the predetermined range. 2. The electricity storage device of claim 1, wherein the control circuit calculates the efficiency by use of Equation 2 during a predetermined time period when the DC/DC converter carries current and when the electricity storage unit is charged, Ef1=C·Vc22-Vc12❘2·∫t1t2(Vi·I)ⅆt[Equation2]where the predetermined time period is from time t1 to time t2, Vi represents the input/output voltage value detected by the input/output voltage detection circuit, I represents the input/output current value detected by the input/output current detection circuit, Vc1 represents an electricity storage unit voltage value detected by the electricity storage unit voltage detection circuit at the time t1, Vc2 represents an electricity storage unit voltage value detected by the electricity storage unit voltage detection circuit at the time t2, C represents the capacitance value of the electricity storage unit, and Ef1 represents the efficiency of the DC/DC converter, andwherein the control circuit calculates the efficiency by use of Equation 3 during a predetermined time period when the DC/DC converter carries current and when the charging unit is discharged, Ef2=2·∫t1t2(Vi·I)ⅆtC·Vc22-Vc12❘[Equation3]where the predetermined time period is from time t1 to time t2, Vi represents the input/output voltage value detected by the input/output voltage detection circuit, I represents the input/output current value detected by the input/output current detection circuit, Vc1 represents an electricity storage unit voltage value detected by the electricity storage unit voltage detection circuit at the time t1, Vc2 represents an electricity storage unit voltage value detected by the electricity storage unit voltage detection circuit at the time t2, C represents the capacitance value of the electricity storage unit, and Ef2 represents the efficiency of the DC/DC converter. 3. The electricity storage device of claim 1, wherein the control circuit calculates the predetermined range, based on the voltage value of power input to and output from the DC/DC converter, the current value of power input to and output from the DC/DC converter, and the voltage value of the electricity storage unit. 4. The electricity storage device of claim 3, wherein when the electricity storage unit and the DC/DC converter are determined to be normal, the control circuit stores an efficiency as the predetermined range, the efficiency being calculated based on: a changeable value of the voltage value of power input to and output from the DC/DC converter;a changeable value of the current value of power input to and output from the DC/DC converter; anda changeable value of the voltage value of the electricity storage unit. 5. The electricity storage device of claim 1, further comprising a temperature sensor configured to detect a temperature of the DC/DC converter, wherein the control circuit calculates the predetermined range based on:the voltage value of power input to and output from the DC/DC converter;the current value of power input to and output from the DC/DC converter;the voltage value of the electricity storage unit; andthe temperature detected by the temperature sensor. 6. The electricity storage device of claim 5, wherein when the electricity storage unit and the DC/DC converter are determined to be normal, the control circuit stores an efficiency as the predetermined range, the efficiency being calculated based on: a changeable value of the voltage value of power input to and output from the DC/DC converter;a changeable value of the current value of power input to and output from the DC/DC converter;a changeable value of the voltage value of the electricity storage unit; andthe temperature to be detected by the temperature sensor. 7. The electricity storage device of claim 1, wherein when the efficiency lies in the predetermined range, the control circuit determines at least any one of the electricity storage unit and the DC/DC converter to be abnormal when the sign of the difference between a previous efficiency obtained a predetermined time ago and the presently obtained efficiency is different from the sign of the difference between an efficiency before the previous efficiency obtained at an earlier predetermined time and the previous efficiency. 8. The electricity storage device of claim 2, further comprising an electricity storage unit temperature sensor configured to detect a temperature of the electricity storage unit, wherein the control circuit stores: a voltage deterioration coefficient which is a reciprocal number of a ratio of a first electricity storage unit lifespan obtained when the electricity storage unit voltage is applied to the electricity storage unit, with respect to a reference lifespan obtained when a reference voltage is applied to the electricity storage unit at a reference temperature;a temperature deterioration coefficient which is the reciprocal number of a ratio of a second electricity storage unit lifespan at an electricity storage unit temperature detected by the electricity storage unit temperature sensor with respect to the reference lifespan at the electricity storage unit temperature detected by the electricity storage unit temperature sensor; anda correlation between an elapsed time obtained when the reference voltage is applied at the reference temperature and the capacitance value of the electricity storage unit, andwherein the control circuit calculates the voltage deterioration coefficient and the temperature deterioration coefficient every time interval; adds, to an integration time during which the electricity storage unit stores power, a value obtained by multiplying each time interval by the voltage deterioration coefficient and the temperature deterioration coefficient; and calculates the capacitance value which the electricity storage unit has, based on the correlation and the integration time. 9. The electricity storage device of claim 8, wherein the control circuit stores the deterioration limit value which is the allowable deterioration as the capacitance of the electricity storage unit; compares the capacitance value with the deterioration limit value and determines the electricity storage unit to be abnormal when the capacitance value is smaller than the deterioration limit value; and determines the DC/DC converter to be abnormal when the electricity storage unit is normal while the efficiency calculated based on the (Equation 2) or (Equation 3) lies out of the predetermined range. 10. The electricity storage device of claim 1, wherein the control circuit outputs an abnormality signal when at least any one of the electricity storage unit and the DC/DC converter is determined to be abnormal.
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