KR101326508B1 - Trouble diagnosis method of current sensor for high voltage battery system - Google Patents

Trouble diagnosis method of current sensor for high voltage battery system Download PDF

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KR101326508B1
KR101326508B1 KR1020080055354A KR20080055354A KR101326508B1 KR 101326508 B1 KR101326508 B1 KR 101326508B1 KR 1020080055354 A KR1020080055354 A KR 1020080055354A KR 20080055354 A KR20080055354 A KR 20080055354A KR 101326508 B1 KR101326508 B1 KR 101326508B1
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value
current
voltage
battery
current sensor
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KR20090129212A (en
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김석형
구재승
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기아자동차주식회사
현대자동차주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/02—Arrangements in which the value to be measured is automatically compared with a reference value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC

Abstract

본 발명은 배터리의 전압 및 전류의 특성을 이용하여 전류값이 변하지 않는데 전압값이 일정값 이상 변하거나, 전압값이 변하지 않는데 전류값이 일정값 이상 변하는 경우에 전류센서 라인의 단선 및 단락 이외의 고장을 판단함으로써, 고전압 배터리 상태를 예측함에 있어 신뢰성을 높이고 하이브리드 차량의 상품성을 향상시킬 수 있도록 한 고전압 배터리시스템 전류센서의 고장진단방법을 제공하는데 그 목적이 있다.The present invention does not change the current value by using the characteristics of the voltage and current of the battery, but if the voltage value changes by more than a certain value, or the voltage value does not change but the current value changes by a certain value other than disconnection and short circuit of the current sensor line It is an object of the present invention to provide a method for diagnosing a failure of a high voltage battery system current sensor that can improve reliability in predicting a high voltage battery state and improve the merchandise of a hybrid vehicle by determining a failure.

이를 위해, 본 발명은 BMS가 전류센서의 출력전압값을 받아 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값 보다 작은지를 판단하는 단계; 상기 BMS가 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값보다 작은 경우 전류센서의 전원라인이 단선 또는 단락된 것으로 판단하는 단계; 및 상기 BMS가 계산한 전류값이 음전압 설정값보다 크고 양전압 설정값보다 작은 경우 배터리의 전압변화량이 제1기준전압값 미만이고, BMS가 계산한 전류변화량이 제1기준전류값을 초과하는지를 판단하는 단계를 포함하고, 상기 배터리의 전압변화량이 제1기준전압값 미만이고, BMS가 계산한 전류변화량이 제1기준전류값을 초과하는 경우 전류센서가 고장인 것으로 판단하는 것을 특징으로 하는 고전압 배터리시스템 전류센서의 고장진단방법을 제공한다.To this end, the present invention comprises the steps of determining whether the current value calculated by the BMS receives the output voltage value of the current sensor is greater than the positive voltage set value or less than the negative voltage set value; Determining that the power line of the current sensor is disconnected or shorted when the current value calculated by the BMS is larger than the positive voltage setting value or smaller than the negative voltage setting value; And when the current value calculated by the BMS is greater than the negative voltage set value and smaller than the positive voltage set value, whether the voltage change amount of the battery is less than the first reference voltage value, and whether the current change amount calculated by the BMS exceeds the first reference current value. And determining, if the voltage change amount of the battery is less than the first reference voltage value and the current change amount calculated by the BMS exceeds the first reference current value, the high voltage, characterized in that it is determined that the current sensor is faulty. Provides a method for diagnosing faults in battery system current sensors.

고전압 배터리, 전류센서, 단선, 단락 High Voltage Battery, Current Sensor, Disconnection, Short Circuit

Description

고전압 배터리시스템 전류센서의 고장진단방법{Trouble diagnosis method of current sensor for high voltage battery system}Trouble diagnosis method of current sensor for high voltage battery system

본 발명은 고전압 배터리시스템에서 전류센서의 단선 및 단락 이외의 고장에 대한 고장진단방법에 관한 것이다.The present invention relates to a failure diagnosis method for failures other than disconnection and short circuit of the current sensor in a high voltage battery system.

하이브리드 차량에는 비교적 고전압(예를 들면, 500V 정도)의 주행용 고전압 배터리가 구비되고, 또 이와는 별도로 비교적 저전압(예를 들면, 12V 정도)의 직류 전력을 축적하는 차량 탑재 전장품용 저전압 배터리가 구비된다. The hybrid vehicle includes a high voltage battery for driving at a relatively high voltage (for example, about 500 V), and a low voltage battery for vehicle-mounted electronics that accumulates a relatively low voltage (for example, about 12 V) of DC power. .

여기서, 상기 고전압 배터리의 경우에는 연속적으로 충전(회생제동)과 방전이 번갈아 가면서 발생한다.Here, in the case of the high voltage battery, charging (regenerative braking) and discharging occur alternately.

이때, 고전압 배터리는 실제 방전 가능한 최대 전류를 출력하고, 또한 발전 및 회생 제동시 충전 가능한 최대 전류를 받는 것이 차량 전체 효율 및 연비를 개선하는 측면에서 중요하다. In this case, it is important for the high voltage battery to output the maximum dischargeable current and to receive the maximum chargeable current during generation and regenerative braking in terms of improving the overall efficiency and fuel economy of the vehicle.

도 1은 하이브리드 차량의 일반적인 구동 계통을 나타내는 개략도이다. 1 is a schematic diagram showing a general drive system of a hybrid vehicle.

도 1에 도시한 바와 같이, 엔진(1)과, 엔진(1)의 보조를 위한 구동모터(2)와, 충방전을 위한 고전압배터리(3)가 구비되고, 구동모터(2)와 고전압배터리(3)는 모터 인버터(4) 및 메인 릴레이(5)에 의해 전기적으로 연결된다. As shown in FIG. 1, an engine 1, a driving motor 2 for assisting the engine 1, and a high voltage battery 3 for charging and discharging are provided, and the driving motor 2 and the high voltage battery are provided. 3 is electrically connected by the motor inverter 4 and the main relay 5.

이에 따라, 상기 구동모터(2)와 고전압배터리(3)는 모터 제어기(MCU)(6) 및 배터리 제어기(BMS)(7)와, 그리고 엔진 제어기(EMS)(8), 차량 제어기(HCU)(9) 등의 협조적인 제어에 의해 상호 연계적으로 작동하고, 결국 배터리측의 충전 및 방전 작용이 일어날 수 있다. Accordingly, the drive motor 2 and the high voltage battery 3 may include a motor controller (MCU) 6 and a battery controller (BMS) 7, and an engine controller (EMS) 8 and a vehicle controller (HCU). By cooperative control of (9) and the like, they operate in conjunction with each other, and eventually the charging and discharging action on the battery side may occur.

한편, 전류센서(10)가 고전압 배터리(3)에 설치되어 고전압배터리(3)에 흐르는 전류를 감지하고, 배터리제어기(7)가 전류센서(10)를 통해 감지된 전류값을 읽어 배터리의 충전상태(State Of Charge;SOC)를 계산하는데 주요 인자로 사용한다. Meanwhile, the current sensor 10 is installed in the high voltage battery 3 to detect the current flowing in the high voltage battery 3, and the battery controller 7 reads the current value detected through the current sensor 10 to charge the battery. Used as the main factor in calculating the state of charge (SOC).

차량제어기(9)는 배터리제어기(7)의 SOC를 참조하여 차량의 동력을 분배하는데 주요 인자로 사용한다. 즉, HCU(9)는 BMS(7) SOC를 참조하여 운전자 요구조건에 따라 동력보조(ASSIST)량을 결정하는데, 같은 운전자 요구 조건 하에서 SOC가 높으면 동력보조량을 증가시키고, SOC가 낮으면 동력보조량을 감소시킨다(도 2).The vehicle controller 9 is used as a main factor in distributing the power of the vehicle with reference to the SOC of the battery controller 7. That is, the HCU 9 determines the amount of power assist (ASSIST) according to the driver requirements with reference to the BMS 7 SOC. If the SOC is high under the same driver requirement, the power assist amount is increased. Reduce the amount of aid (FIG. 2).

여기서, 상기 전류센서(10)의 고장은 배터리제어기(7)와 전류센서(10) 사이의 하드 와이어(전원라인)의 단선, 단락, 그 이외의 고장으로 구분할 수 있다.Here, the failure of the current sensor 10 may be classified into a disconnection, a short circuit, or other failure of the hard wire (power line) between the battery controller 7 and the current sensor 10.

종래기술에 의한 전류센서(10) 전원라인의 단선, 단락 검출 방법을 설명하면 다음과 같다. Referring to the disconnection and short circuit detection method of the power line of the current sensor 10 according to the prior art as follows.

BMS(7)는 전류센서(10)의 출력 전압 값으로 전류값을 계산한다. 이때, 배터리(3)를 기준으로 -는 충전방향, +는 방전방향이라고 할때, 배터리가 최대로 충방 전이 일어날 수 있는 전류는 -150A ~ +150A 이다.The BMS 7 calculates a current value based on the output voltage value of the current sensor 10. At this time, when-is the charging direction, + is the discharge direction, based on the battery (3), the current that can occur the maximum charge-discharge transition of the battery is -150A ~ + 150A.

그리고, 전류센서(10) 자체의 특성상 전류센서(10)의 전원라인이 단선되면 -225A에 해당하는 전압이 출력되며, 전류센서(10)의 전원라인이 단락(쇼트)되면 +225A에 해당하는 전압이 출력된다.When the power line of the current sensor 10 is disconnected due to the characteristics of the current sensor 10 itself, a voltage corresponding to −225 A is output. When the power line of the current sensor 10 is shorted (shorted), it corresponds to +225 A. The voltage is output.

따라서, 전류센서(10)의 출력전압값이 ±200A을 벗어날 경우 전류센서(10) 라인이 단선 또는 단락되었음을 검출하게 된다. 미설명부호 11은 프리차지 릴레이, 12은 LDC, 13은 저전압 배터리이다.Therefore, when the output voltage value of the current sensor 10 is out of ± 200A, it is detected that the current sensor 10 line is disconnected or shorted. Reference numeral 11 denotes a precharge relay, 12 LDC, and 13 a low voltage battery.

그런데, 종래에는 전류센서의 단선 및 단락으로 인한 고장 외에 센서의 전원공급이 충분하지 않거나 전류값이 이상할 경우에 센서의 고장판단이 불가능하였다. However, in the related art, it is impossible to determine the failure of the sensor when the power supply of the sensor is insufficient or the current value is abnormal in addition to the failure due to disconnection and short circuit of the current sensor.

즉, 전류센서의 고장이 발생했으나, BMS가 측정한 전류값이 -150A ~ +150A 영역 내에 있으면 BMS는 전류센서의 고장을 감지하지 못하고 SOC 계산에 오류가 발생하게 된다.That is, if the current sensor has failed, but the current value measured by the BMS is within the range of -150A to + 150A, the BMS will not detect the failure of the current sensor and an error will occur in the SOC calculation.

이와 같이, 전류센서의 단선 및 단락 외의 고장으로 배터리 SOC를 잘 못 계산하는 경우가 발생하면, 예를 들어 실제 SOC가 낮으나 SOC가 높다고 잘 못 계산되게 되면, HCU가 운전자 요구조건에 의해 SOC가 낮을 때 보다 상대적으로 큰 동력보조량을 요구하게 되며, 그에 해당하는 에너지를 배터리에서 공급받는다.In this case, if the battery SOC is incorrectly calculated due to a failure other than disconnection and short circuit of the current sensor, for example, if the actual SOC is low but the SOC is incorrectly calculated as high, the HCU may be low. This requires a relatively larger amount of power assistance, and the corresponding energy is supplied from the battery.

이때, 실제 배터리의 SOC가 낮은 상황에서 큰 에너지를 공급받게 되므로 배터리가 과방전되어 배터리의 고장을 초래할 수 있다. 물론 BMS 자체에서 과방전을 방지하기 위해 HCU에서 요구한 동력보조량보다 더 작은 양만 공급하게 되는데, 이는 HCU에서 원하는 동력보조량이 아니므로 특히 등판 및 가속 시 차량의 운전성 및 상품성을 저하시키는 문제가 있다.In this case, since a large amount of energy is supplied in a situation where the actual SOC of the battery is low, the battery may be over discharged, which may cause battery failure. Of course, in order to prevent over-discharge in the BMS itself, only a smaller amount than the power assistance required by the HCU is supplied, which is not the desired power assistance in the HCU. have.

본 발명은 상기와 같은 점을 감안하여 안출한 것으로서, 배터리의 전압 및 전류의 특성을 이용하여 전류값이 변하지 않는데 전압값이 일정값 이상 변하거나, 전압값이 변하지 않는데 전류값이 일정값 이상 변하는 경우에 전류센서 라인의 단선 및 단락 이외의 고장을 판단함으로써, 고전압 배터리 상태를 예측함에 있어 신뢰성을 높이고 하이브리드 차량의 상품성을 향상시킬 수 있도록 한 고전압 배터리시스템 전류센서의 고장진단방법을 제공하는데 그 목적이 있다.The present invention has been made in view of the above, the current value does not change by using the characteristics of the voltage and current of the battery, the voltage value changes by more than a certain value, or the voltage value does not change, but the current value changes by a certain value In this case, it is possible to provide a method for diagnosing faults in high-voltage battery system current sensors that can improve reliability in predicting high-voltage battery conditions and improve the merchandise of hybrid vehicles by determining faults other than disconnection and short-circuit of the current sensor line. There is this.

상기한 목적을 달성하기 위한 본 발명은 고전압 배터리시스템 전류센서의 고장진단방법에 있어서,The present invention for achieving the above object is a failure diagnosis method of a high voltage battery system current sensor,

BMS가 전류센서의 출력전압값을 받아 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값 보다 작은지를 판단하는 단계; Determining whether the current value calculated by receiving the output voltage value of the current sensor is greater than the positive voltage setting value or smaller than the negative voltage setting value;

상기 BMS가 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값보다 작은 경우 전류센서의 전원라인이 단선 또는 단락된 것으로 판단하는 단계; 및Determining that the power line of the current sensor is disconnected or shorted when the current value calculated by the BMS is larger than the positive voltage setting value or smaller than the negative voltage setting value; And

상기 BMS가 계산한 전류값이 음전압 설정값보다 크고 양전압 설정값보다 작은 경우 배터리의 전압변화량이 제1기준전압값 미만이고, BMS가 계산한 전류변화량이 제1기준전류값을 초과하는지를 판단하는 단계를 포함하고, 상기 배터리의 전압변화량이 제1기준전압값 미만이고, BMS가 계산한 전류변화량이 제1기준전류값을 초 과하는 경우 전류센서가 고장인 것으로 판단한다.If the current value calculated by the BMS is greater than the negative voltage set value and less than the positive voltage set value, it is determined whether the voltage change amount of the battery is less than the first reference voltage value and the current change amount calculated by the BMS exceeds the first reference current value. And the voltage change amount of the battery is less than the first reference voltage value, and the current change amount calculated by the BMS exceeds the first reference current value.

바람직한 구현예로서, 상기 배터리의 전압변화량이 제1기준전압값을 초과하거나, 상기 배터리의 전압변화량이 제1기준전압값 미만 및 BMS가 계산한 전류변화량이 제1기준전류값 미만인 경우 전류센서가 정상인 것으로 판단한다.In a preferred embodiment, if the voltage change amount of the battery exceeds the first reference voltage value, or if the voltage change amount of the battery is less than the first reference voltage value and the current change amount calculated by the BMS is less than the first reference current value, It is determined to be normal.

본 발명의 다른 측면은 고전압 배터리시스템 전류센서의 고장진단방법에 있어서,Another aspect of the present invention is a failure diagnosis method of a high voltage battery system current sensor,

BMS가 전류센서의 출력전압값을 받아 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값보다 작은지를 판단하는 단계; Determining whether the current value calculated by receiving the output voltage value of the current sensor is greater than the positive voltage setting value or less than the negative voltage setting value;

상기 BMS가 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값보다 작은 경우 전류센서의 전원라인이 단선 또는 단락된 것으로 판단하는 단계; 및Determining that the power line of the current sensor is disconnected or shorted when the current value calculated by the BMS is larger than the positive voltage setting value or smaller than the negative voltage setting value; And

상기 BMS가 계산한 전류값이 음전압 설정값보다 크고 양전압 설정값보다 작은 경우 BMS가 계산한 전류변화량이 제2기준전류값 미만이고, 배터리의 전압변화량이 제2기준전압값을 초과하는지를 판단하는 단계를 포함하고, 상기 BMS가 계산한 전류변화량이 제2기준전류값 미만이고, 배터리의 전압변화량이 제2기준전압값을 초과하는 경우 전류센서가 고장인 것으로 판단한다.When the current value calculated by the BMS is greater than the negative voltage set value and smaller than the positive voltage set value, it is determined whether the current change amount calculated by the BMS is less than the second reference current value, and the voltage change amount of the battery exceeds the second reference voltage value. And the current change amount calculated by the BMS is less than a second reference current value, and the voltage change amount of the battery exceeds the second reference voltage value.

바람직한 구현예로서, 상기 BMS가 계산한 전류변화량이 제2기준전류값을 초과하거나, 상기 BMS가 계산한 전류변화량이 제2기준전류값 미만 및 배터리의 전압변화량이 제2기준전압값미만인 경우 전류센서가 정상인 것으로 판단한다.In a preferred embodiment, the current change amount calculated by the BMS exceeds a second reference current value, or the current change amount calculated by the BMS is less than a second reference current value and the voltage change amount of the battery is less than the second reference voltage value. It is determined that the sensor is normal.

이에 따라 본 발명에 따른 고전압 배터리시스템 전류센서 고장진단방법에 의하면, 배터리의 전압 및 전류의 특성을 이용하여 전류값이 변하지 않는데 전압값이 일정값 이상 변하거나, 전압값이 변하지 않는데 전류값이 일정값 이상 변하는 경우에 전류센서 라인의 단선 및 단락 이외의 고장을 판단함으로써, 전류센서의 단선 및 단락은 물론 그 이외의 고장도 판단하여 고전압 배터리 상태 예측의 신뢰도를 높이고, 하이브리드 차량의 상품성 및 성능을 향상시킬 수 있다.Accordingly, according to the high voltage battery system current sensor failure diagnosis method according to the present invention, the current value does not change by using the characteristics of the voltage and current of the battery, but the voltage value changes by more than a certain value, or the voltage value does not change, but the current value is constant. In the event of a change in the value, it is possible to determine faults other than disconnection and short-circuit of the current sensor line, and judge faults and short-circuits of the current sensor as well as other faults to increase the reliability of predicting high-voltage battery status, and to improve the merchandise and performance of the hybrid vehicle. Can be improved.

또한, 본 발명은 단선 및 단락 외의 고장을 판별하기 위해 전류센서의 전원전압 측정을 위한 별도의 하드 와이어 및 A/D 컨버터가 필요없으므로 원가를 절감할 수 있다.In addition, the present invention can reduce the cost because there is no need for a separate hard wire and A / D converter for measuring the power supply voltage of the current sensor in order to determine failures other than disconnection and short circuit.

이하, 본 발명의 바람직한 실시예를 첨부도면을 참조로 상세하게 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

첨부한 도 3은 하이브리드 자동차의 일반적인 배터리 시스템의 구성을 나타내는 블록도이고, 도 4는 전류에 대한 배터리 전압의 거동을 나타내는 개략도이고, 도 5a 내지 도 5c는 본 발명의 일실시예에 따른 고전압 배터리시스템 전류센서의 고장진단방법의 유형을 설명하기 위한 개략도이다.3 is a block diagram showing the configuration of a general battery system of a hybrid vehicle, FIG. 4 is a schematic diagram showing the behavior of battery voltage with respect to current, and FIGS. 5A to 5C are high voltage batteries according to an embodiment of the present invention. This is a schematic diagram to explain the type of fault diagnosis method of system current sensor.

하이브리드 자동차의 일반적인 배터리 시스템은 도 3에 도시된 바와 같이 다수의 배터리로 구성되는 고전압배터리부(100), 상기 배터리 라인을 연결하는 릴레이 등을 포함하여 구성되는 고전압 릴레이부(101), 상기 고전압배터리부(100)와 고전압 릴레이부(101)를 제어하는 BMS(Battery Management System)(102)를 포함하여 구성된다.As shown in FIG. 3, a general battery system of a hybrid vehicle includes a high voltage battery unit 100 including a plurality of batteries, a high voltage relay unit 101, and a high voltage battery including a relay connecting the battery lines. It is configured to include a battery management system (BMS) 102 for controlling the unit 100 and the high voltage relay unit 101.

상기 고전압 릴레이부(101)는 프리차지 릴레이(precharge relay)와 메인 릴레이(main relay), 전류 센서, 퓨즈 및 안전 스위치등을 포함하여 구성된다. The high voltage relay unit 101 includes a precharge relay, a main relay, a current sensor, a fuse, a safety switch, and the like.

상기 BMS(102)는 배터리의 전압, 전류, 온도 등을 모니터링, 배터리 냉각 제어, 셀밸런싱, 고전압 릴레이 제어, 고장 진단 등의 기능을 수행한다.The BMS 102 performs functions such as monitoring voltage, current, and temperature of the battery, battery cooling control, cell balancing, high voltage relay control, and fault diagnosis.

한편, 전류센서(10)의 고장은 BMS(102)와 전류센서(10) 간의 하드 와이어(전원라인) 단선, 단락, 및 기타 3가지 유형으로 구분할 수 있다.On the other hand, the failure of the current sensor 10 can be classified into three types of hard wire (power line) disconnection, short circuit, and the like between the BMS 102 and the current sensor 10.

또한, 전류센서(10)의 단선 및 단락 외의 고장은 전류센서(10)의 전류값이 0A로 홀딩, 특정 전류값으로 홀딩, 및 전류값의 변동(FLUCTUATION) 3가지 유형으로 구분할 수 있다.In addition, faults other than disconnection and short circuit of the current sensor 10 may be classified into three types: holding the current value of the current sensor 10 as 0A, holding the specific current value, and fluctuation of the current value.

일반적으로 전류에 대한 배터리의 전압 거동은 도 4에 도시한 바와 같이 전류가 인가되지 않으면 전압값은 변하지 않다가(ⓐ구간) 전류가 인가되면서 전압이 변하고(ⓑ구간), 다시 전류가 인가되지 않으면 전압값이 안정화되는 특성을 갖는다(ⓒ구간).In general, the voltage behavior of the battery with respect to the current does not change when the current is not applied, as shown in FIG. 4 (ⓐ section). The voltage value is stabilized (© section).

이러한 배터리의 특성을 이용하여 실제로 전압값이 변하지 않았는데 전류값이 변한 경우(도 4 ⓐ구간 특성 이용, 로직 1 참조)이거나, 전류값이 변하지 않았는데 전압이 변할 경우(도 4 ⓑ구간 특성 이용, 로직 2 참조)에 전류센서의 이상을 판단한다.By using the characteristics of the battery, the voltage value does not actually change when the current value changes (see Fig. 4 ⓐ using the section characteristics, logic 1), or when the voltage does not change when the current value does not change (Fig. 4 Refer to 2) to determine the fault of the current sensor.

즉, 전류변화(ΔIb)가 없는데(전류값이 0A(도 5a) 또는 특정값(도 5b)으로 고정됨) 전압 변화(ΔV)가 큰 경우, 또는 전압변화가 없는데 전류변화가 큰 경우 (도 5c)에 전류센서의 이상(고장)을 검출하게 된다.That is, when there is no current change ΔIb (the current value is fixed to 0A (FIG. 5A) or a specific value (FIG. 5B)), or the voltage change ΔV is large, or there is no voltage change, but the current change is large (FIG. 5C ) Will detect abnormality of the current sensor.

이와 같은 원리에 의한 본 발명의 고전압 배터리 시스템 전류센서 고장진단방법을 설명하면 다음과 같다.Referring to the high voltage battery system current sensor failure diagnosis method according to the present invention as follows.

도 6은 본 발명에 따른 고전압 배터리시스템 전류센서의 고장진단방법을 나타내는 순서도이다.6 is a flowchart illustrating a failure diagnosis method of a high voltage battery system current sensor according to the present invention.

먼저, BMS는 전류센서의 출력전압 값으로 전류값을 계산한다. 전류센서 자체의 특성상 전류센서 전원라인이 단선되면 -225A에 해당하는 전압이 출력되고, 전류센서 전원라인이 단락되면 +225A에 해당하는 전압이 출력된다. 이때, 배터리에 최대로 충방전될 수 있는 전류는 ±150A 이내 이기 때문에 BMS가 측정한 전류값이 -200A미만이거나 +200A를 초과할 경우 전류센서의 전원라인이 단선 또는 단락된 것으로 진단한다.First, the BMS calculates the current value based on the output voltage value of the current sensor. Due to the characteristics of the current sensor itself, if the current sensor power line is disconnected, a voltage of -225A is output. If the current sensor power line is shorted, a voltage of + 225A is output. At this time, the maximum charge / discharge current of the battery is within ± 150A. If the current value measured by the BMS is less than -200A or exceeds + 200A, the power line of the current sensor is diagnosed as disconnected or shorted.

여기서, 전류센서의 단선 및 단락 고장진단방법은 종래기술과 대동소이하고, 본 발명은 전류센서의 단선 및 단락 이외의 고장진단방법을 제공한다.Here, the disconnection and short circuit fault diagnosis method of the current sensor is similar to the prior art, and the present invention provides a fault diagnosis method other than the disconnection and short circuit of the current sensor.

즉, 상기 BMS가 측정한 전류값이 -200~+200A 이고, 전압변화가 20mV 미만 및 전류변화가 30A를 초과하는 경우에 전류센서가 고장인 것으로 판단하고(로직 1), 또한 BMS가 측정한 전류값이 -200~+200A 이고, 전류변화가 1A 미만 및 전압변화가 100mV를 초과하는 경우에 전류센서가 고장인 것으로 판단한다(로직 2).That is, when the current value measured by the BMS is -200 to +200 A, the voltage change is less than 20 mV and the current change is more than 30 A, the current sensor is determined to be faulty (logic 1), and the BMS is measured. If the current value is -200 ~ + 200A, the current change is less than 1A and the voltage change is more than 100mV, it is determined that the current sensor is faulty (logic 2).

그러나, 도 4 ⓒ구간에 도시한 바와 같이, ⓐ,ⓑ구간과 달리 전류가 변하지 않았는데 전압이 변하는 구간이 있다. 이러한 경우 전류센서가 고장인 것으로 판단하면 않된다.However, as shown in the section ⓒ of FIG. 4, there is a section in which the voltage changes, although the current does not change, unlike the section ⓐ and ⓑ. In this case, the current sensor should not be determined to be faulty.

따라서 배터리의 전류 및 전압 곡선의 특성을 이용하여 ②~⑤의 값을 선정하게 된다. 이 값은 배터리의 특성에 따라 계산되어져야 하는 값이다.Therefore, the value of ② ~ ⑤ is selected by using the characteristics of the current and voltage curve of the battery. This value should be calculated according to the characteristics of the battery.

또한, BMS가 측정한 전류값이 -200~+200A 이고 상기 조건을 만족하지 않거나, BMS가 측정한 전류값이 -200~+200A 이고 전압변화가 20mV를 초과, 또는 BMS가 측정한 전류값이 -200~+200A 이고 전압변화가 20mV 미만 및 전류변화가 30A미만인 경우에 전류센서가 정상인 것으로 판단한다.In addition, the current value measured by the BMS is -200 to +200 A and does not satisfy the above condition, or the current value measured by the BMS is -200 to +200 A and the voltage change exceeds 20 mV, or the current value measured by the BMS is If the voltage change is less than 20mV and the current change is less than 30A, the current sensor is considered normal.

그리고, BMS가 측정한 전류값이 -200~+200A 이고 전류변화가 1A를 초과하거나, BMS가 측정한 전류값이 -200~+200A 이고 전류변화가 1A 미만 및 전압변화가 100mV 미만인 경우에 전류센서가 정상인 것으로 판단한다.And when the current value measured by BMS is -200 ~ + 200A and the current change exceeds 1A, or the current value measured by BMS is -200 ~ + 200A, the current change is less than 1A and the voltage change is less than 100mV It is determined that the sensor is normal.

이상에서는 본 발명을 특정의 바람직한 실시예에 대하여 도시하고 설명하였으나, 본 발명은 이러한 실시예에 한정되지 않으며, 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 특허청구범위에서 청구하는 본 발명의 기술적 사상을 벗어나지 않는 범위내에서 실시할 수 있는 다양한 형태의 실시예들을 모두 포함한다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And all of the various forms of embodiments that can be practiced without departing from the technical spirit.

도 1은 하이브리드 차량의 일반적인 구동 계통을 나타내는 개략도,1 is a schematic diagram showing a general drive system of a hybrid vehicle,

도 2는 배터리 SOC에 따른 HCU의 동력보조 맵을 나타내는 개략도,2 is a schematic diagram showing a power assist map of an HCU according to a battery SOC;

도 3은 하이브리드 자동차의 일반적인 배터리 시스템의 구성을 나타내는 블록도,3 is a block diagram showing a configuration of a general battery system of a hybrid vehicle;

도 4는 전류에 대한 배터리 전압의 거동을 나타내는 개략도,4 is a schematic diagram showing the behavior of a battery voltage with respect to current;

도 5a 내지 도 5c는 본 발명의 일실시예에 따른 고전압 배터리시스템 전류센서의 고장진단방법의 유형을 설명하기 위한 개략도,5A to 5C are schematic diagrams for explaining types of a failure diagnosis method of a high voltage battery system current sensor according to an embodiment of the present invention;

도 6은 본 발명에 따른 고전압 배터리시스템 전류센서의 고장진단방법을 나타내는 순서도이다.6 is a flowchart illustrating a failure diagnosis method of a high voltage battery system current sensor according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

100 : 고전압 배터리부 101 : 고전압 릴레이부100: high voltage battery unit 101: high voltage relay unit

102 : BMS 103 : HCU102: BMS 103: HCU

Claims (4)

고전압 배터리시스템 전류센서의 고장진단방법에 있어서,In the fault diagnosis method of the high voltage battery system current sensor, BMS가 전류센서의 출력전압값을 받아 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값 보다 작은지를 판단하는 단계; Determining whether the current value calculated by receiving the output voltage value of the current sensor is greater than the positive voltage setting value or smaller than the negative voltage setting value; 상기 BMS가 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값보다 작은 경우 전류센서의 전원라인이 단선 또는 단락된 것으로 판단하는 단계; 및Determining that the power line of the current sensor is disconnected or shorted when the current value calculated by the BMS is larger than the positive voltage setting value or smaller than the negative voltage setting value; And 상기 BMS가 계산한 전류값이 음전압 설정값보다 크고 양전압 설정값보다 작은 경우 배터리의 전압변화량이 제1기준전압값 미만이고, BMS가 계산한 전류변화량이 제1기준전류값을 초과하는지를 판단하는 단계를 포함하고, 상기 배터리의 전압변화량이 제1기준전압값 미만이고, BMS가 계산한 전류변화량이 제1기준전류값을 초과하는 경우 전류센서가 고장인 것으로 판단하는 것을 특징으로 하는 고전압 배터리시스템 전류센서의 고장진단방법.If the current value calculated by the BMS is greater than the negative voltage set value and less than the positive voltage set value, it is determined whether the voltage change amount of the battery is less than the first reference voltage value and the current change amount calculated by the BMS exceeds the first reference current value. And a voltage change amount of the battery being less than a first reference voltage value and determining that the current sensor is faulty when the current change amount calculated by the BMS exceeds the first reference current value. How to troubleshoot the system current sensor. 청구항 1에 있어서,The method according to claim 1, 상기 배터리의 전압변화량이 제1기준전압값을 초과하거나, 상기 배터리의 전압변화량이 제1기준전압값 미만 및 BMS가 계산한 전류변화량이 제1기준전류값 미만인 경우 전류센서가 정상인 것으로 판단하는 것을 특징으로 하는 고전압 배터리시스템 전류센서의 고장진단방법.If the voltage change amount of the battery exceeds the first reference voltage value, or if the voltage change amount of the battery is less than the first reference voltage value and the current change amount calculated by the BMS is less than the first reference current value, it is determined that the current sensor is normal. A failure diagnosis method for a high voltage battery system current sensor. 고전압 배터리시스템 전류센서의 고장진단방법에 있어서,In the fault diagnosis method of the high voltage battery system current sensor, BMS가 전류센서의 출력전압값을 받아 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값보다 작은지를 판단하는 단계; Determining whether the current value calculated by receiving the output voltage value of the current sensor is greater than the positive voltage setting value or less than the negative voltage setting value; 상기 BMS가 계산한 전류값이 양전압 설정값보다 크거나 음전압 설정값보다 작은 경우 전류센서의 전원라인이 단선 또는 단락된 것으로 판단하는 단계; 및Determining that the power line of the current sensor is disconnected or shorted when the current value calculated by the BMS is larger than the positive voltage setting value or smaller than the negative voltage setting value; And 상기 BMS가 계산한 전류값이 음전압 설정값보다 크고 양전압 설정값보다 작은 경우 BMS가 계산한 전류변화량이 제2기준전류값 미만이고, 배터리의 전압변화량이 제2기준전압값을 초과하는지를 판단하는 단계를 포함하고, 상기 BMS가 계산한 전류변화량이 제2기준전류값 미만이고, 배터리의 전압변화량이 제2기준전압값을 초과하는 경우 전류센서가 고장인 것으로 판단하는 것을 특징으로 하는 고전압 배터리시스템 전류센서의 고장진단방법.When the current value calculated by the BMS is greater than the negative voltage set value and smaller than the positive voltage set value, it is determined whether the current change amount calculated by the BMS is less than the second reference current value, and the voltage change amount of the battery exceeds the second reference voltage value. And a current change amount calculated by the BMS is less than a second reference current value, and the voltage change amount of the battery exceeds the second reference voltage value. How to troubleshoot the system current sensor. 청구항 3에 있어서,The method of claim 3, 상기 BMS가 계산한 전류변화량이 제2기준전류값을 초과하거나, 상기 BMS가 계산한 전류변화량이 제2기준전류값 미만 및 배터리의 전압변화량이 제2기준전압값미만인 경우 전류센서가 정상인 것으로 판단하는 것을 특징으로 하는 고전압 배터리시스템 전류센서의 고장진단방법.If the current change amount calculated by the BMS exceeds the second reference current value, or the current change amount calculated by the BMS is less than the second reference current value and the voltage change amount of the battery is less than the second reference voltage value, the current sensor is determined to be normal. Fault diagnosis method of a high-voltage battery system current sensor, characterized in that.
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