Method and device for operating a sensor for determining exhaust gas components, in particular for a motor vehicle
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01M-015/10
F01N-013/00
F02D-041/14
F02B-037/16
F02D-041/22
F02D-041/00
출원번호
US-0075625
(2013-11-08)
등록번호
US-9140625
(2015-09-22)
우선권정보
DE-10 2012 021 929 (2012-11-09)
발명자
/ 주소
Doering, Andreas
출원인 / 주소
MAN TRUCK & BUS AG
대리인 / 주소
Lucas & Mercanti, LLP
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
A method and a device for operating a sensor is provided in an exhaust gas system of an internal combustion engine for determining the emissions contained in an exhaust gas flow, in particular, of nitrogen oxides, ammonia, oxygen and/or unburnt carbon, with the exhaust gas flow acting on the sensor
A method and a device for operating a sensor is provided in an exhaust gas system of an internal combustion engine for determining the emissions contained in an exhaust gas flow, in particular, of nitrogen oxides, ammonia, oxygen and/or unburnt carbon, with the exhaust gas flow acting on the sensor during measurement phases. Between the measurement phases, the sensor is at least largely kept free from the exhaust gas flow, wherein the duration and/or the frequency of the measurement phases can be set as a function of operating parameters of the internal combustion engine and/or of the exhaust gas regulation system. A measurement space which surrounds the sensor is exposed to a pressurized flushing gas immediately after a measurement phase, as a result of which the exhaust gas present in the measurement space is displaced out of the measurement space into the exhaust gas flow.
대표청구항▼
1. A method for operating a sensor in an exhaust gas system of an internal combustion engine for determining the emissions contained in an exhaust gas flow, comprising the steps of: allowing the exhaust gas flow to act on the sensor in a measurement space surrounding the sensor during measurement ph
1. A method for operating a sensor in an exhaust gas system of an internal combustion engine for determining the emissions contained in an exhaust gas flow, comprising the steps of: allowing the exhaust gas flow to act on the sensor in a measurement space surrounding the sensor during measurement phases; andkeeping the sensor free from the exhaust gas flow between the measurement phases, by exposing the measurement space to a flushing gas immediately after each of the measurement phases, such that exhaust gas present in the measurement space is displaced out of the measurement space into the exhaust gas flow. 2. The method of claim 1, wherein the emissions determined by the sensor include at least one of nitrogen oxides, ammonia, oxygen, and unburnt carbon. 3. The method of claim 1, wherein the flushing gas is air. 4. The method of claim 1, further comprising the step of exposing the sensor to a calibration gas in calibration phases. 5. The method of claim 1, wherein the flushing gas is fed into the measurement space by one of a fan and a compressor. 6. The method of claim 1, wherein the flushing gas delivered to the measurement space from a pressure side of a compressor of an exhaust gas turbocharger. 7. The method of claim 1, further comprising the step of determining one of a duration or frequency of the measurement phases as a function of current or differentiated operating parameters of at least one of the internal combustion engine and an exhaust gas after-treatment system. 8. The method of claim 7, wherein the current or differentiated current or differentiated operating parameters include at least one of injection pressure, start of injection, boost pressure, charge air temperature, number of operated engine cylinders, turbocharger rotational speed, raw emissions of the exhaust gas components, number of injections, exhaust gas temperature, catalytic converter temperature, fuel consumed, and quality of reducing agent supplied. 9. The method of claim 1, wherein exhaust gas is drawn into the measurement space during the measurement phases. 10. The method of claim 9, wherein the intake of exhaust gas into the measurement space is accomplished using a vacuum present on a fresh air intake side of the engine. 11. The method of claim 9, wherein the exhaust gas is drawn into the measurement space through a sulfur trap having a compound suitable for bonding sulfur oxides from exhaust gas. 12. The method of claim 11, wherein the compound comprises one of Ca(OH)2, activated carbon, or CaO. 13. The method of claim 9, wherein the intake of exhaust gas into the measurement space is carried out by a jet pump using compressed air. 14. The method of claim 13, wherein the compressed air is charging air from a turbocharger of the internal combustion engine. 15. The method of claim 1, wherein concentrically arranged cylinders form the measurement space, the cylinders each having cylinder walls with bores or perforations forming selectably closable passage openings, the method comprising closing the passage openings to shut off the measurement space from the exhaust gas flow. 16. The method of claim 1, wherein the step of exposing the measurement space to a flushing gas includes exposing the measurement space to a pressurized flushing gas. 17. A device for an exhaust gas regulation system of an internal combustion engine, comprising: a sensor for determining emissions contained in an exhaust gas flow;a measurement space shielded from the exhaust gas flow by an at least partially gas-permeable shielding device, the sensor being arranged in the measurement space; anda gas channel connected to the measurement space, wherein a flushing gas is introducible into the measurement space by the gas channel for keeping the measurement space free of exhaust gas flow between measurement phases. 18. The device of claim 17, wherein the shielding device is a gas-permeable membrane arranged between the exhaust gas channel and measurement space. 19. The device of claim 17, further comprising concentrically arranged cylinders forming the measurement space, the cylinders each having cylinder walls with bores or perforations forming selectably closable passage openings. 20. The device of claim 17, further comprising an intake line connected to the measurement space for drawing exhaust gas into the measurement space. 21. The device of claim 20, further comprising a controllable valve disposed in the intake line and the intake line is connected to a fresh air intake side of the internal combustion engine. 22. The device of claim 20, further comprising a jet pump arranged in the intake line using compressed air as the propellant. 23. The device of claim 22, wherein compressed charge air from a turbocharged internal combustion engine is used as a propellant for the jet pump. 24. The device of claim 20, further comprising a filter device serving as a sulfur trap, wherein exhaust gas drawn through the intake line flows through the filter device to a fresh air intake side of the internal combustion engine. 25. The device of claim 17, further comprising a gas line connected to the measurement space for introducing a calibration gas into the measurement space. 26. A vehicle having an internal combustion engine and exhaust gas regulation system with a device according to claim 17.
Hunt Frank W. (Walled Lake MI) Kaneyasu Masayoshi (Farmington Hills MI) Saikalis George (West Bloomfield MI), Engine and emission monitoring and control system utilizing gas sensors.
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