Mild Hybrid Apparatus And Calibration Method of Current Sensor Thereof

The present invention provides a mild hybrid apparatus for offset and scale correction of a current sensor and a method for correcting an error of a current sensor of the mild hybrid apparatus. The mild hybrid apparatus comprises: a first current sensor for measuring a three-phase current flowing in...

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Main Author LEE, YOUNG OK
Format Patent
LanguageEnglish
Korean
Published 07.12.2018
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Abstract The present invention provides a mild hybrid apparatus for offset and scale correction of a current sensor and a method for correcting an error of a current sensor of the mild hybrid apparatus. The mild hybrid apparatus comprises: a first current sensor for measuring a three-phase current flowing in a three-phase link of an inverter; a second current sensor for measuring a DC current flowing at the DC link of the inverter; a third current sensor for measuring a battery current flowing in a battery connected to the DC link of the inverter; a fourth current sensor for measuring a converter current flowing in a converter connected to the DC link of the inverter; and a controller for outputting a torque command value to the inverter. Here, the controller compares the DC current with the sum of the battery current and the converter current to determine whether a difference (a first difference value) is equal to or greater than a first reference value, compares the DC current with the sum of the three-phase current to determine whether a difference (a second difference value) is equal to or greater than a second reference value, and performs scale correction of the second current sensor when the first difference value is equal to or greater than the first reference value and the second difference value is equal to or greater than the second reference value. Therefore, the present invention can perform scale and offset correction of a current sensor connected to a DC link, thereby controlling an inverter and a motor generator more stably and preventing an abnormal operation of the motor generator. 본 발명은 전류 센서의 옵셋과 스케일을 보정하기 위하여, 인버터의 3상 링크단에 흐르는 3상 전류를 측정하는 제1 전류 센서와, 인버터의 DC 링크단에 흐르는 DC 전류를 측정하는 제2 전류 센서와, 인버터의 DC 링크단과 연결되는 배터리에 흐르는 배터리 전류를 측정하는 제3 전류 센서와, 인버터의 DC 링크단과 연결되는 컨버터에 흐르는 컨버터 전류를 측정하는 제4 전류 센서와, 인버터에 토크 지령값을 출력하는 제어기를 포함하는 마일드 하이브리드 장치 및 이의 전류 센서의 오차 보상 방법을 제공한다. 여기서, 제어기는 DC 전류를 배터리 전류와 컨버터 전류의 합과 비교하여, 그 차이(제1 차이값)가 제1 기준값 이상인지 판단하고, DC 전류를 3상 전류의 합과 비교하여, 그 차이(제2 차이값)가 제2 기준값 이상인지 판단하고, 제1 차이값이 제1 기준값 이상이고 제2 차이값이 제2 기준값 이상이면, 제2 전류 센서의 스케일 보정을 수행한다.
AbstractList The present invention provides a mild hybrid apparatus for offset and scale correction of a current sensor and a method for correcting an error of a current sensor of the mild hybrid apparatus. The mild hybrid apparatus comprises: a first current sensor for measuring a three-phase current flowing in a three-phase link of an inverter; a second current sensor for measuring a DC current flowing at the DC link of the inverter; a third current sensor for measuring a battery current flowing in a battery connected to the DC link of the inverter; a fourth current sensor for measuring a converter current flowing in a converter connected to the DC link of the inverter; and a controller for outputting a torque command value to the inverter. Here, the controller compares the DC current with the sum of the battery current and the converter current to determine whether a difference (a first difference value) is equal to or greater than a first reference value, compares the DC current with the sum of the three-phase current to determine whether a difference (a second difference value) is equal to or greater than a second reference value, and performs scale correction of the second current sensor when the first difference value is equal to or greater than the first reference value and the second difference value is equal to or greater than the second reference value. Therefore, the present invention can perform scale and offset correction of a current sensor connected to a DC link, thereby controlling an inverter and a motor generator more stably and preventing an abnormal operation of the motor generator. 본 발명은 전류 센서의 옵셋과 스케일을 보정하기 위하여, 인버터의 3상 링크단에 흐르는 3상 전류를 측정하는 제1 전류 센서와, 인버터의 DC 링크단에 흐르는 DC 전류를 측정하는 제2 전류 센서와, 인버터의 DC 링크단과 연결되는 배터리에 흐르는 배터리 전류를 측정하는 제3 전류 센서와, 인버터의 DC 링크단과 연결되는 컨버터에 흐르는 컨버터 전류를 측정하는 제4 전류 센서와, 인버터에 토크 지령값을 출력하는 제어기를 포함하는 마일드 하이브리드 장치 및 이의 전류 센서의 오차 보상 방법을 제공한다. 여기서, 제어기는 DC 전류를 배터리 전류와 컨버터 전류의 합과 비교하여, 그 차이(제1 차이값)가 제1 기준값 이상인지 판단하고, DC 전류를 3상 전류의 합과 비교하여, 그 차이(제2 차이값)가 제2 기준값 이상인지 판단하고, 제1 차이값이 제1 기준값 이상이고 제2 차이값이 제2 기준값 이상이면, 제2 전류 센서의 스케일 보정을 수행한다.
Author LEE, YOUNG OK
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Snippet The present invention provides a mild hybrid apparatus for offset and scale correction of a current sensor and a method for correcting an error of a current...
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SubjectTerms MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
Title Mild Hybrid Apparatus And Calibration Method of Current Sensor Thereof
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