Particulate matter sensor, system, and method of using a correction unit
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-015/06
F01N-009/00
출원번호
US-0354644
(2012-01-20)
등록번호
US-8915119
(2014-12-23)
우선권정보
JP-2011-009500 (2011-01-20)
발명자
/ 주소
Ueno, Tomohiro
Yahata, Shigeto
출원인 / 주소
Denso Corporation
대리인 / 주소
Nixon & Vanderhye PC
인용정보
피인용 횟수 :
3인용 특허 :
5
초록▼
A detection apparatus includes a particulate matter (PM) detection unit, a temperature detection unit, and a correction unit. The PM detection unit includes an insulator, a pair of electrodes, and a detector. The insulator is disposed in an exhaust path of an internal combustion engine through which
A detection apparatus includes a particulate matter (PM) detection unit, a temperature detection unit, and a correction unit. The PM detection unit includes an insulator, a pair of electrodes, and a detector. The insulator is disposed in an exhaust path of an internal combustion engine through which an exhaust gas flows. The pair of electrodes are arranged in contact with at least a part of the insulator. The detector detects a PM detection value which is a value correlated to an amount of PM in the exhaust gas. The temperature detection unit detects at least one of an exhaust temperature of the exhaust gas passing through the PM detection unit and an insulator temperature of the insulator. The correction unit corrects the PM detection value detected by the PM detection unit based on at least one of the exhaust temperature and the insulator temperature.
대표청구항▼
1. A detection apparatus, comprising: a particulate matter detection unit that includes an insulator that is disposed in an exhaust path of an internal combustion engine through which an exhaust gas flows,a pair of electrodes that are arranged in contact with at least a part of the insulator, anda d
1. A detection apparatus, comprising: a particulate matter detection unit that includes an insulator that is disposed in an exhaust path of an internal combustion engine through which an exhaust gas flows,a pair of electrodes that are arranged in contact with at least a part of the insulator, anda detector that detects a particulate matter detection value which is a value correlated to an amount of particulate matter in the exhaust gas, the particulate matter attaching to the insulator and enabling current to flow between the pair of electrodes while voltage is applied across the pair of electrodes;an exhaust temperature detection unit that detects an exhaust temperature of the exhaust gas passing through the particulate matter detection unit;an insulator temperature detection unit that detects an insulator temperature of the insulator; anda correction unit that corrects the particulate matter detection value detected by the particulate matter detection unit based on the exhaust temperature detected by the exhaust temperature detection unit and the insulator temperature detected by the insulator temperature detection unit. 2. The detection apparatus according to claim 1, further comprising an exhaust flow rate detection unit that detects an exhaust flow rate of the exhaust gas passing through the insulator,wherein the correction unit corrects the particulate matter detection value detected by the particulate matter detection unit based on the exhaust flow rate detected by the exhaust flow rate detection unit and the exhaust temperature detected by the exhaust temperature detection unit and the insulator temperature detected by the insulator temperature detection unit. 3. The detection apparatus according to claim 2, further comprising a separation rate detection unit that detects a separation rate of particulate matter that separates from the insulator to which particulate matter is attached,wherein the correction unit corrects the particulate matter detection value detected by the particulate matter detection unit based on the separation rate of particulate matter detected by the separation rate detection unit, the exhaust flow rate detected by the exhaust flow rate detection unit, and the exhaust temperature detected by the exhaust temperature detection unit and the insulator temperature detected by the insulator temperature detection unit. 4. The detection apparatus according to claim 3, wherein the separation rate detection includes an exhaust flow rate detection unit that detects an exhaust flow rate of the exhaust gas passing through the insulator, and a calculation unit that calculates the separation rate of particulate matter based on the particulate matter detection value and the exhaust flow rate. 5. The detection apparatus according to claim 1, wherein the correction unit includes a first sub-correction unit that corrects a rate of change of the particulate matter detection value detected by the particulate matter detection unit in such a manner that, as a value obtained by subtracting the exhaust temperature from the insulator temperature becomes larger, the rate of change of the particulate matter detection value is corrected to a value indicating a larger amount of particulate matter. 6. The detection apparatus according to claim 5, wherein the correction unit includes a second sub-correction unit that corrects the particulate matter detection value detected by the particulate matter detection unit in such a manner that, as the exhaust temperature or the insulator temperature becomes higher, the particulate matter detection value is corrected to a value indicating a larger amount of particulate matter. 7. The detection apparatus according to claim 6, further comprising an exhaust flow rate detection unit that detects an exhaust flow rate of the exhaust gas passing through the insulator,wherein the correction unit includes a third sub-correction unit that corrects a rate of change of the particulate matter detection value detected by the particulate matter detection unit in such a manner that, as the exhaust flow rate detected by the exhaust flow rate detection unit becomes larger, the rate of change of the particulate matter detection value is corrected to a value indicating a larger amount of particulate matter. 8. The detection apparatus according to claim 7, further comprising a separation rate detection unit that detects a separation rate of particulate matter that separates from the insulator to which particulate matter is attached,wherein the correction unit includes a fourth sub-correction unit that corrects the particulate matter detection value detected by the particulate matter detection unit in such a manner that, as the separation rate of particulate matter detected by the separation rate detection unit becomes larger, the particulate matter detection value is corrected to a value indicating a larger amount of particulate matter. 9. The detection apparatus according to claim 8, wherein the fourth sub-correction unit corrects the particulate matter detection value detected by the particulate matter detection unit in such a manner that, as an output value of the particulate matter detection unit becomes larger, the particulate matter detection value is corrected to a value indicating a larger amount of particulate matter. 10. The detection apparatus according to claim 1, further comprising an exhaust flow rate detection unit that detects an exhaust flow rate of the exhaust gas passing through the insulator,wherein the exhaust temperature detection unit includes a temperature sensor that is disposed in the exhaust path and measures the exhaust temperature of the exhaust gas flowing in the exhaust path, and a calculation unit that calculates the exhaust temperature of the exhaust gas passing through the particulate matter detection unit based on the exhaust temperature measured by the temperature sensor and the insulator temperature detected by the insulator temperature detection unit and the exhaust flow rate of the exhaust gas detected by the exhaust flow rate detection unit. 11. The detection apparatus according to claim 1, further comprising a heating unit that includes a resistor and a power unit that supplies the electric power to the resistor to heat the insulator,wherein the insulator temperature detection unit includes a first detection unit that detects the insulator temperature based on a resistance value of the resistor. 12. The detection apparatus according to claim 1, further comprising: a temperature sensor that that is disposed in the exhaust path and measures the exhaust temperature of the exhaust gas flowing in the exhaust path, andan exhaust flow rate detection unit that detects an exhaust flow rate of the exhaust gas passing through the insulator, whereinthe insulator temperature detection unit detects the insulator temperature based on the exhaust temperature measured by the temperature sensor and the exhaust flow rate detected by the exhaust flow rate detection unit. 13. The detection apparatus according to claim 1, further comprising: an exhaust flow rate detection unit that detects an exhaust flow rate of the exhaust gas passing through the insulator;at least one of an instruction unit that instructs a fuel injection quantity for a cylinder of the internal combustion engine, a temperature sensor that that is disposed in the exhaust path and measures the exhaust temperature of the exhaust gas flowing in the exhaust path, and a pressure detection unit that detects an exhaust path pressure in the exhaust path of the internal combustion engine; andan intake volume detection unit that detects an intake volume of an intake gas flowing in an intake path of the internal combustion engine,wherein the exhaust flow rate detection unit detects the exhaust flow rate based on the intake volume detected by the intake volume detection unit and at least one of the fuel injection quantity instructed by the instruction unit, the exhaust temperature measured by the temperature sensor, and the exhaust path pressure detected by the pressure detection unit. 14. An engine system, comprising: an internal combustion engine; anda detection apparatus including a particulate matter detection unit that includes an insulator that is disposed in an exhaust path of the internal combustion engine through which an exhaust gas flows,a pair of electrodes that are arranged in contact with at least a part of the insulator, anda detector that detects a particulate matter detection value which is a value correlated to the amount of particulate matter in the exhaust gas, the particulate matter attaching to the insulator and enabling current to flow between the pair of electrodes while voltage is applied across the pair of electrodes;an exhaust temperature detection unit that detects an exhaust temperature of the exhaust gas passing through the particulate matter detection unit;an insulator temperature detection unit that detects an insulator temperature of the insulator; anda correction unit that corrects the particulate matter detection value detected by the particulate matter detection unit based on the exhaust temperature detected by the exhaust temperature detection unit and the insulator temperature detected by the insulator temperature detection unit. 15. The engine system according to claim 14, further comprising a particulate filter that is disposed in the exhaust path and collects particulate matter in the exhaust gas of the internal combustion engine. 16. The engine system according to claim 15, wherein the internal combustion engine is a diesel engine, andthe particulate filter is a diesel particulate filter for the diesel engine. 17. The engine system according to claim 14, wherein: the detection apparatus further comprises an exhaust flow rate detection unit that detects an exhaust flow rate of the exhaust gas passing through the insulator,wherein the correction unit corrects the particulate matter detection value detected by the particulate matter detection unit based on the exhaust flow rate detected by the exhaust flow rate detection unit and the exhaust temperature detected by the exhaust temperature detection unit and the insulator temperature detected by the insulator temperature detection unit. 18. The engine system according to claim 14, wherein the correction unit includes a first sub-correction unit that corrects a rate of change of the particulate matter detection value detected by the particulate matter detection unit in such a manner that, as a value obtained by subtracting the exhaust temperature from the insulator temperature becomes larger, the rate of change of the particulate matter detection value is corrected to a value indicating a larger amount of particulate matter. 19. A detection method, comprising: (i) at a particulate matter detection unit including an insulator that is disposed in an exhaust path of an internal combustion engine through which an exhaust gas flows, a pair of electrodes that are arranged in contact with at least a part of the insulator, and a detector, detecting a particulate matter detection value which is a value correlated to an amount of particulate matter in the exhaust gas, the particulate matter attaching to the insulator and enabling current to flow between the pair of electrodes while voltage is applied across the pair of electrodes;(ii) at an exhaust temperature detection unit, detecting an exhaust temperature of the exhaust gas passing through the particulate matter detection unit;(iii) at an insulator temperature detection unit, detecting an insulator temperature of the insulator; and(iv) at a correction unit, correcting the particulate matter detection value detected by the particulate matter detection unit based on the exhaust temperature detected by the exhaust temperature detection unit and the insulator temperature detected by the insulator temperature detection unit. 20. The detection method according to claim 19, further comprising (v) at an exhaust flow rate detection unit, detecting an exhaust flow rate of the exhaust gas passing through the insulator,wherein the correction unit corrects the particulate matter detection value detected by the particulate matter detection unit based on the exhaust flow rate detected by the exhaust flow rate detection unit and the exhaust temperature detected by the exhaust temperature detection unit and the insulator temperature detected by the insulator temperature detection unit. 21. The detection method according to claim 20, further comprising (vi) at a separation rate detection unit, detecting a separation rate of particulate matter that separates from the insulator to which particulate matter is attached,wherein the correction unit corrects the particulate matter detection value detected by the particulate matter detection unit based on the separation rate of particulate matter detected by the separation rate detection unit, the exhaust flow rate detected by the exhaust flow rate detection unit, and the exhaust temperature detected by the exhaust temperature detection unit and the insulator temperature detected by the insulator temperature detection unit.
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이 특허에 인용된 특허 (5)
Takeuchi Yukihisa (Chita JPX) Miura Yasunao (Kasugai JPX) Hirayama Tsukasa (Ohbu JPX), Detector for particulate density and filter with detector for particulate density.
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