KR20080054078A - A revision method of soc for a hybrid electric vehicle - Google Patents

A revision method of soc for a hybrid electric vehicle Download PDF

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KR20080054078A
KR20080054078A KR1020060126207A KR20060126207A KR20080054078A KR 20080054078 A KR20080054078 A KR 20080054078A KR 1020060126207 A KR1020060126207 A KR 1020060126207A KR 20060126207 A KR20060126207 A KR 20060126207A KR 20080054078 A KR20080054078 A KR 20080054078A
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battery
soc
capacity
electric vehicle
hybrid electric
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KR100861232B1 (en
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최경덕
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넥스콘 테크놀러지 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/549—Current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/91—Electric vehicles
    • 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

A method of revising an SOC(State of Charge) of a battery for a hybrid electric vehicle is provided to prevent the SOC of the battery from being distorted due to accumulated errors during long-time driving. A method of revising an SCO of a battery for a hybrid electric vehicle includes the steps of: measuring a voltage, a current, and temperature of the battery(S101); calculating the SOC of the battery by using the voltage, current, and temperature of the battery(S102); checking a time of point when the battery is stabilized when the hybrid electric vehicle is driven by an engine without using a motor using power of the battery as a power source(S103); measuring an actual SOC of the battery for an OCV(Open Circuit Voltage) of a battery terminal at the time of point when the battery is stabilized(S104); and comparing the SOC in the step S101 with the SCO in the step S104(S105); determining whether or not the comparison value is more than an error range(S106); and revising the SOC of the battery if the comparison value is more than the error range(S107).

Description

하이브리드 전기자동차의 배터리 잔존용량 보정방법{a revision method of SOC for a Hybrid Electric Vehicle}Battery residual capacity correction method of hybrid electric vehicle {a revision method of SOC for a Hybrid Electric Vehicle}

도 1은 본 발명의 한 실시예의 작동 흐름도1 is a flow chart of operation of one embodiment of the present invention;

본 발명은 내연기관의 엔진과 배터리의 전원을 이용한 모터를 동력원으로 사용하는 하이브리드 전기자동차(HEV; Hybrid Electric Vehicle)의 배터리 잔존용량 보정방법에 관한 것으로, 더 자세하게는 하이브리드 전기자동차의 주행 및 정지 시 산출된 배터리 잔존용량(SOC; State of Charge)을 측정된 배터리 개로전압(OCV;Open Circuit Voltage)과 비교하여 산출된 배터리 잔존용량 오차를 보정함으로써 배터리 잔존용량의 심각한 오차발생을 방지할 수 있도록 한 것에 관한 것이다.The present invention relates to a method for compensating battery residual capacity of a hybrid electric vehicle (HEV) using a motor using an engine of an internal combustion engine and a battery as a power source, and more particularly, when the hybrid electric vehicle is driven and stopped. Compensation of the calculated battery remaining capacity error by comparing the calculated battery state of charge (SOC) with the measured battery open circuit voltage (OCV) to prevent serious errors in battery remaining capacity. It's about things.

일반적으로 하이브리드 전기 자동차(HEV; Hybrid Electric Vehicle)의 배터리의 잔존용량(SOC; State of Charge) 산출방법은 사용 전류와 시간의 관계에서 사 용된 용량을 구하여 배터리 잔존용량(SOC)값을 산출하는 전류 적산방법; 전지 단자의 개로전압(OCV;Open Circuit Voltage)을 측정하여 미리 측정된 개로전압(OCV)에 대한 배터리 잔존용량 값을 테이블화하여 배터리 잔존용량(SOC)값을 산출하는 개로전압 측정방법; 그리고 배터리의 내부저항(IR-drop; Internal Resistance - drop)에 따른 배터리 잔존용량(SOC)값을 산출하는 내부저항 측정방법; 등이 주로 사용되고 있다.In general, a method of calculating a state of charge (SOC) of a battery of a hybrid electric vehicle (HEV) is a current which calculates a used capacity in a relationship between current and time to calculate a battery residual capacity (SOC) value. Integration method; An open circuit voltage measurement method of measuring an open circuit voltage (OCV) of a battery terminal and calculating a battery residual capacity (SOC) value by tabulating a battery remaining capacity value with respect to a previously measured open circuit voltage (OCV); An internal resistance measuring method for calculating a battery residual capacity (SOC) value according to an internal resistance (IR-drop) of the battery; Etc. are mainly used.

그러나 하이브리드 전기자동차의 주행 및 정지 시 상기 전류 적산방법, 상기 배터리 개로전압 측정방법, 상기 배터리 내부저항 측정방법 중에서 어느 하나만을 사용하여 배터리 잔존용량을 산출하게 되면 산출된 값과 실제 값에 심각한 오차가 생길 수가 있게 된다.However, when the battery remaining capacity is calculated using only one of the current integration method, the battery open circuit voltage measurement method, and the battery internal resistance measurement method during driving and stopping of a hybrid electric vehicle, a serious error occurs between the calculated value and the actual value. It can happen.

일반적으로 하이브리드 전기자동차의 주행 시에는 상기 전류 적산방법으로 배터리 잔존용량 산출할 수 있게 되지만 이를 보정하지 않게 되면 배터리 잔존용량 오차가 시간이 지날수록 점점 커지게 되며, 배터리 개로전압 측정방법과 배터리 내부저항 측정방법의 경우 주행 중에 배터리 잔존용량 산출이 어렵게 된다.In general, when driving a hybrid electric vehicle, the battery remaining capacity can be calculated by the current integration method, but if it is not corrected, the battery remaining capacity error becomes larger as time goes by. In the case of the measurement method, it is difficult to calculate the remaining battery capacity while driving.

또한 하이브리드 전기자동차 정지 시에는 상기 개로전압 측정방법으로 배터리 잔존용량을 산출할 수 있게 되지만 주행 중에는 배터리 잔존용량을 산출할 수 없어 무용지물이 된다.In addition, when the hybrid electric vehicle is stopped, the battery residual capacity can be calculated by the open circuit voltage measurement method, but the battery residual capacity cannot be calculated while driving, and thus becomes useless.

본 발명은 상기 종래의 실정을 감안하여 안출한 것이며, 그 목적이 하이브리 드 전기자동차 주행 중이나 정지 시 산출된 배터리 잔존용량을 보정하여 보다 정확한 배터리 잔존용량을 산출할 수 있도록 하는 하이브리드 전기자동차의 배터리 잔존용량 보정방법을 제공하는 데에 있는 것이다.The present invention has been devised in view of the above-mentioned conventional situation, and the purpose of the hybrid electric vehicle battery can be calculated to correct battery residual capacity calculated during driving or stopping of a hybrid electric vehicle, so as to calculate a more accurate battery remaining capacity. It is to provide a method for correcting remaining capacity.

본 발명은 상기의 목적을 달성하기 위하여 배터리의 전압, 전류, 온도를 이용하여 측정한 배터리 잔존용량 1차 측정값과, 하이브리드 전기자동차가 배터리의 전원을 이용한 모터를 동력원으로 사용하지 않고 엔진으로 구동할 때 배터리가 안정화를 찾게 되는 시점에서 다시 배터리 단자의 개로전압(OCV)을 통해 측정한 배터리 잔존용량 2차 측정값을 비교하여 오차범위 이상이면 배터리 잔존용량(SOC)을 보정하는 것을 특징으로 하며, 이하 그 구체적인 기술내용을 첨부도면에 의거하여 더욱 자세히 설명하면 다음과 같다.In order to achieve the above object, the present invention provides a primary measurement value of a battery remaining capacity measured using a voltage, current, and temperature of a battery, and a hybrid electric vehicle is driven by an engine without using a motor using a battery power as a power source. At the time when the battery finds stabilization, the battery residual capacity (SOC) is corrected when the error is greater than the error range by comparing the secondary measurement value of the battery remaining capacity measured through the open circuit voltage (OCV) of the battery terminal. Hereinafter, the specific technical details will be described in more detail based on the accompanying drawings.

도 1에는 본 발명의 흐름도가 도시되어 있는 바, 본 발명의 하이브리드 전기자동차의 배터리 잔존용량 보정방법은1 is a flow chart of the present invention, the battery remaining capacity correction method of the hybrid electric vehicle of the present invention

배터리의 전압, 전류, 온도를 측정하는 단계(S101);Measuring voltage, current, and temperature of the battery (S101);

배터리의 전압, 전류, 온도를 이용하여 배터리 잔존용량을 산출하는 제1산출단계(S102);A first calculation step S102 of calculating a battery remaining capacity using a voltage, a current, and a temperature of the battery;

하이브리드 전기자동차가 배터리의 전원을 이용한 모터를 동력원으로 사용하지 않고 엔진으로 구동할 때 배터리가 안정화를 찾게 되는 시점을 체크하는 단계(S103);Checking a time point at which the battery finds stabilization when the hybrid electric vehicle is driven by the engine without using the motor using the battery power as a power source (S103);

배터리가 안정화를 찾게 된 시점에서 배터리 단자의 개로전압(OCV)에 대한 실제 배터리 잔존용량(SOC)을 측정하는 제2산출단계(S104);A second calculation step S104 of measuring an actual battery remaining capacity SOC with respect to the open circuit voltage OVC of the battery terminal at the time when the battery finds stabilization;

상기 제1산출단계(102)의 배터리 잔존용량(SOC)과 제2산출단계(S104)의 배터리 잔존용량(SOC)을 비교하는 단계(S105);Comparing the remaining battery capacity SOC of the first calculating step 102 with the remaining battery capacity SOC of the second calculating step S104 (S105);

상기 비교값이 오차범위 이상인지를 판단하는 단계(S106);Determining whether the comparison value is greater than or equal to an error range (S106);

상기 비교값이 오차범위 이상이면 배터리 잔존용량(SOC)을 보정하는 단계(S107);로 이루어진 것이다.If the comparison value is more than the error range step of correcting the remaining battery capacity (SOC) (S107).

본 발명에 있어서 배터리의 전압, 전류, 온도를 이용하여 배터리 잔존용량을 산출하는 제1산출단계(S102)에서는 전술한 배터리 잔존용량 산출방법인 전류적산방법, 전지 개로전압 측정방법, 전지 내부저항 측정방법 중의 어느 하나의 방법을 사용하여 배터리 잔존용량을 산출할 수 있다.In the first calculation step (S102) of calculating the battery remaining capacity using the voltage, current, and temperature of the battery in the present invention, the current accumulation method, the battery open circuit voltage measuring method, and the battery internal resistance measurement, which are the battery remaining capacity calculation methods described above The remaining battery capacity can be calculated using any of the methods.

아울러 본 발명에 있어서 하이브리드 전기자동차가 배터리의 전원을 이용한 모터를 동력원으로 사용하지 않고 엔진으로 구동할 때 배터리가 안정화를 찾게 되는 시점은 배터리의 충전과 방전 전류가 없는 때로 하는 것이 극히 바람직하다.In addition, in the present invention, when the hybrid electric vehicle is driven by an engine without using a motor using a battery power source as a power source, it is extremely preferable that the time when the battery finds stabilization is when there is no charge and discharge current of the battery.

한편 배터리 단자의 개로전압(OCV)을 측정하여 미리 측정된 개로전압(OCV)에 대한 배터리 잔존용량 값을 테이블화한 실제 배터리 잔존용량(SOC)값을 이용하여 보정하며, 이 때 배터리 단자의 개로전압(OCV)을 측정하여 미리 측정된 값(OCV)에 대한 배터리 잔존용량 값의 테이블은 온도에 따라 정리된 실제 배터리 잔존용량(SOC)값을 이용하여 보정한다.On the other hand, by measuring the open-circuit voltage (OCV) of the battery terminal and calibrating the battery residual capacity value with respect to the measured open-circuit voltage (OCV) using a table of the actual battery remaining capacity (SOC) value, at this time The table of battery remaining capacity values with respect to the previously measured value (OCV) by measuring the voltage (OCV) is corrected by using the actual battery remaining capacity (SOC) value arranged according to the temperature.

상기와 같이 구성된 본 발명에 있어서는 배터리의 전압, 전류, 온도를 이용 하여 측정한 배터리 잔존용량값과, 하이브리드 전기자동차가 배터리의 전원을 이용한 모터를 동력원으로 사용하지 않고 엔진으로 구동할 때 배터리가 안정화를 찾게 되는 시점에서 다시 배터리 단자의 개로전압(OCV)을 통해 측정한 배터리 잔존용량값을 비교하여 오차범위 이상이면 배터리 잔존용량(SOC)을 보정함으로써 항상 배터리 충전상태를 정확히 추정할 수 있게 되며, 하이브리드 전기자동차의 장시간 운행 중 누적 오차로 생긴 배터리 잔존용량의 틀어짐을 방지할 수 있게 된다.In the present invention configured as described above, the battery remaining capacity value measured using the voltage, current, temperature of the battery, and the battery is stabilized when the hybrid electric vehicle is driven by the engine without using a motor using the battery power as a power source At the time of finding, the battery residual capacity value measured by the open circuit voltage (OCV) of the battery terminal is compared again and if the error range is over, the battery residual capacity (SOC) is corrected so that the battery state can always be accurately estimated. It is possible to prevent distortion of the remaining battery capacity caused by the cumulative error during the long-term operation of the hybrid electric vehicle.

이상에서 설명한 바와 같이 본 발명은 배터리의 개로전압(OCV)를 이용하여 하이브리드 전기자동차가 주행 중 배터리를 사용하지 않고 엔진 구동 시 배터리 관리 시스템(BMS)이 배터리가 안정화를 찾게 되는 시점에서 배터리 잔존용량을 보정할 수 있게 되는 동시에 하이브리드 자동차가 정지하였을 경우 배터리가 안정화를 찾게 되는 시점에서 배터리 잔존용량을 보정할 수 있게 되는 것으로, 본 발명에 의하면, 산출된 배터리 잔존용량 오차 값을 보정하여 배터리 충전 상태를 보다 정확히 추정할 수 있으며, 장시간 운행 중 누적 오차로 생긴 배터리 잔존용량의 틀어짐을 방지할 수 있는 탁월한 효과를 기대할 수 있게 된다.As described above, the present invention provides a battery remaining capacity at a time when the battery management system (BMS) seeks stabilization of the battery when the engine is driven without using the battery while the hybrid electric vehicle is driven by using the open circuit voltage (OCV) of the battery. The battery remaining capacity can be corrected at the time when the battery finds stabilization when the hybrid vehicle is stopped, and according to the present invention, the battery remaining state can be corrected by correcting the calculated battery residual error value. It can be estimated more accurately, and can be expected to have an excellent effect to prevent the battery remaining capacity caused by the cumulative error during the long run.

Claims (5)

배터리의 전압, 전류, 온도를 측정하는 단계(S101);Measuring voltage, current, and temperature of the battery (S101); 배터리의 전압, 전류, 온도를 이용하여 배터리 잔존용량을 산출하는 제1산출단계(S102);A first calculation step S102 of calculating a battery remaining capacity using a voltage, a current, and a temperature of the battery; 하이브리드 전기자동차가 배터리의 전원을 이용한 모터를 동력원으로 사용하지 않고 엔진으로 구동할 때 배터리가 안정화를 찾게 되는 시점을 체크하는 단계(S103);Checking a time point at which the battery finds stabilization when the hybrid electric vehicle is driven by the engine without using the motor using the battery power as a power source (S103); 배터리가 안정화를 찾게 된 시점에서 배터리 단자의 개로전압(OCV)에 대한 실제 배터리 잔존용량(SOC)을 측정하는 제2산출단계(S104);A second calculation step S104 of measuring an actual battery remaining capacity SOC with respect to the open circuit voltage OVC of the battery terminal at the time when the battery finds stabilization; 상기 제1산출단계(102)의 배터리 잔존용량(SOC)과 제2산출단계(S104)의 배터리 잔존용량(SOC)을 비교하는 단계(S105);Comparing the remaining battery capacity SOC of the first calculating step 102 with the remaining battery capacity SOC of the second calculating step S104 (S105); 상기 비교값이 오차범위 이상인지를 판단하는 단계(S106);Determining whether the comparison value is greater than or equal to an error range (S106); 상기 비교값이 오차범위 이상이면 배터리 잔존용량(SOC)을 보정하는 단계(S107);로 이루어지는 하이브리드 전기자동차의 배터리 잔존용량 보정방법.Correcting a battery remaining capacity (SOC) when the comparison value is greater than or equal to an error range (S107). 제1항에 있어서, 배터리의 전압, 전류, 온도를 이용하여 배터리 잔존용량을 산출하는 제1산출단계(S102)에서 공지의 배터리 잔존용량 산출방법인 전류적산방법, 전지 개로전압 측정방법, 전지 내부저항 측정방법 중의 어느 하나를 사용하는 것을 특징으로 하는 하이브리드 전기자동차의 배터리 잔존용량 보정방법.The method according to claim 1, wherein the current accumulating method is a known battery remaining capacity calculating method in a first calculation step S102 of calculating a battery remaining capacity using a voltage, a current, and a temperature of a battery. A method for correcting battery residual capacity of a hybrid electric vehicle, using any one of resistance measurement methods. 제1항에 있어서, 배터리 안정화를 찾게 되는 시점을 체크하는 단계(S103)에서 배터리가 안정화를 찾게 되는 시점은 배터리의 충전과 방전 전류가 없는 때로 하는 것을 특징으로 하는 하이브리드 전기자동차의 배터리 잔존용량 보정방법.The battery residual capacity correction of the hybrid electric vehicle according to claim 1, wherein the time when the battery is found to be stabilized in the step S103 of checking the time when the battery is stabilized is found is when there is no charge and discharge current of the battery. Way. 제1항에 있어서, 배터리 잔존용량(SOC)을 보정하는 단계(S107)에서 배터리 단자의 개로전압(OCV)을 측정하여 미리 측정된 개로전압(OCV)에 대한 배터리 잔존용량 값을 테이블화한 실제 배터리 잔존용량(SOC)값을 이용하여 보정하는 것을 특징으로 하는 하이브리드 전기자동차의 배터리 잔존용량 보정방법.According to claim 1, In the step (S107) of correcting the remaining battery capacity SOC by measuring the open circuit voltage (OCV) of the battery terminal, the actual table of the battery residual capacity value against the measured open circuit voltage (OCV) A battery residual capacity correction method of a hybrid electric vehicle, characterized in that the correction by using the battery residual capacity (SOC) value. 제4항에 있어서, 배터리 단자의 개로전압(OCV)을 측정하여 미리 측정된 값(OCV)에 대한 배터리 잔존용량 값의 테이블은 온도에 따라 정리된 실제 배터리 잔존용량(SOC)값을 이용하는 것을 특징으로 하는 하이브리드 전기자동차의 배터리 잔존용량 보정방법.The method of claim 4, wherein the table of the battery residual capacity value with respect to the previously measured value (OCV) by measuring the open-circuit voltage (OCV) of the battery terminal using the actual battery residual capacity (SOC) value arranged according to temperature Battery residual capacity correction method of a hybrid electric vehicle.
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US9857429B2 (en) 2010-02-05 2018-01-02 Continental Automotive Gmbh Device and method for determining a range of a battery characteristic curve
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KR20180082020A (en) * 2017-01-09 2018-07-18 한화지상방산 주식회사 device for detecting the state of charge of a battery
CN106932728A (en) * 2017-03-31 2017-07-07 奇瑞汽车股份有限公司 Battery charge state SOC modification methods, device and electric automobile
CN106932728B (en) * 2017-03-31 2019-09-20 奇瑞新能源汽车技术有限公司 Battery charge state SOC modification method, device and electric car

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