Method and apparatus for measuring and controlling the EGR rate in a combustion engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-025/07
F02D-041/00
F02D-041/14
F02D-041/24
출원번호
US-0261333
(2010-12-22)
등록번호
US-9267452
(2016-02-23)
우선권정보
EP-09180649 (2009-12-23)
국제출원번호
PCT/EP2010/070470
(2010-12-22)
§371/§102 date
20120622
(20120622)
국제공개번호
WO2011/076837
(2011-06-30)
발명자
/ 주소
Auckenthaler, Theophil
출원인 / 주소
FPT MOTORENFORSCHUNG AG
대리인 / 주소
Stetina Brunda Garred & Brucker
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
The present invention provides for a method and apparatus for measuring and controlling the EGR rate in a combustion engine system, comprising an EGR cooler, an EGR valve and a turbine, and determining the EGR mass flow (dmEGR) from the difference between the total exhaust gas mass flow (dmTot) acro
The present invention provides for a method and apparatus for measuring and controlling the EGR rate in a combustion engine system, comprising an EGR cooler, an EGR valve and a turbine, and determining the EGR mass flow (dmEGR) from the difference between the total exhaust gas mass flow (dmTot) across the engine cylinders, and the turbine mass flow (dmTurb) across the turbine.
대표청구항▼
1. A method for measuring and controlling an EGR rate in a combustion engine system, the system comprising engine cylinders, at least an EGR cooler, an EGR valve and a turbine, the method comprising: determining an EGR mass flow (dmEGR) indirectly from the difference between a total exhaust gas mass
1. A method for measuring and controlling an EGR rate in a combustion engine system, the system comprising engine cylinders, at least an EGR cooler, an EGR valve and a turbine, the method comprising: determining an EGR mass flow (dmEGR) indirectly from the difference between a total exhaust gas mass flow (dmTot) across the engine cylinders calculated through an cylinder model, and a turbine mass flow (dmTurb) across the turbine calculated through a turbine model; wherein the cylinder model calculates the total exhaust gas mass flow as the sum of an actual gas mass flow and a fuel mass flow, the actual gas mass flow being calculated from an engine speed and a total gas charge in a cylinder per stroke, the total gas charge in a cylinder per stroke being calculated using a boost air pressure and a boost air temperature at the engine inlet;wherein the turbine model calculates the turbine mass flow across the turbine from an upstream pressure, a downstream pressure, and an upstream temperature; andadjusting the EGR valve based on the determined EGR mass flow (dmEGR). 2. The method according to claim 1, wherein, in a further step of adaptation, the turbine mass flow (dmTurb) or total exhaust gas mass flow (dmTot) are adjusted such that they are equal when the EGR valve is closed. 3. The method according to claim 2, further comprising the following steps: adding or multiplying a feedback correction value or a feedback correction factor with the turbine mass flow (dmTurb), with the feedback correction value or with a feedback correction factor coming from an integrator; adding the result of the previous step to the value of the exhaust gas mass flow (dmTot);applying a gain correction to the result of the previous step;feeding the integrator with the result of the previous step, only if the EGR valve is closed; if the EGR valve is not closed, the input of the integrator is zero. 4. The method according to claim 3, wherein said turbine mass flow (dmTurb) and said exhaust gas mass flow (dmTot) are reciprocally exchanged. 5. The method according to claim 1, wherein, in case of a variable geometry turbine (VGT), the turbine model calculates the turbine mass flow additionally from a VGT position. 6. The method according to claim 1, wherein, in case of a waste gate turbine, the turbine model calculates the turbine mass flow additionally from an opening of a waste gate. 7. The method according to claim 1, wherein, in case of more than one turbine, the turbine model additionally calculates the turbine mass flow (dmTurb) of a turbine downstream of an EGR connection. 8. The method according to claim 7, wherein, for high pressure EGR, the turbine mass flow (dmTurb) of any turbine has to be determined, for mid pressure EGR, the turbine mass flow (dmTurb) of a more downstream turbine has to be determined. 9. An apparatus for measuring and controlling an EGR rate in a combustion engine system having at least an EGR cooler, an EGR valve and a turbine, the apparatus comprising: a boost air pressure sensor for determining a boost air pressure;a boost air temperature sensor for determining a boost air temperature;a turbine inlet pressure sensor for determining a turbine inlet pressure;a turbine upstream pressure sensor for determining a turbine upstream pressure;a turbine downstream pressure sensor for determining a turbine downstream pressure; anda turbine upstream temperature sensor for determining a turbine upstream temperature;wherein the apparatus indirectly determines an EGR mass flow from the difference between a total exhaust gas mass flow across engine cylinders calculated through a cylinder model having as inputs at least the boost air pressure and the boost air temperature, and a turbine mass flow across the turbine calculated through a turbine model having as inputs at least the turbine upstream pressure, the turbine downstream pressure, and the turbine upstream temperature. 10. The apparatus of claim 9, wherein the apparatus is configured to measure and control the EGR rate in a combustion engine system of a motor vehicle. 11. An article of manufacture comprising a non-transitory computer readable medium, the computer readable medium tangibly embodying one or more programs of instructions executable to perform the method of: determining an EGR mass flow (dmEGR) indirectly from the difference between a total exhaust as mass flow (dmTot) across the engine cylinders calculated through an cylinder model and a turbine mass flow (dmTurb) across the turbine calculated through a turbine model; wherein the cylinder model calculates the total exhaust gas mass flow as the sum of an actual gas mass flow and a fuel mass flow, the actual gas mass flow being calculated from an engine speed and a total gas charge in a cylinder per stroke, the total gas charge in a cylinder per stroke being calculated using a boost air pressure, and a boost air temperature at the engine inlet;wherein the turbine model calculates the turbine mass flow across the turbine from an upstream pressure, a downstream pressure, and an upstream temperature; andadjusting the EGR valve based on the determined EGR mass flow (dmEGR). 12. The apparatus according to claim 9, wherein the cylinder model calculates total exhaust gas mass flow as the sum of an actual gas mass flow and a fuel mass flow, wherein the actual gas mass is calculated from an engine speed and a total gas charge in a cylinder per stroke, and wherein the total gas charge in a cylinder per stroke is calculated using the boost air pressure and the boost air temperature. 13. An apparatus according to claim 9, wherein, the turbine has a fixed geometry. 14. An apparatus according to claim 9, wherein the turbine has a variable geometry, and wherein the turbine model calculates the turbine mass flow additionally from a turbine variable geometry position. 15. The method according to claim 1, wherein the total gas charge in a cylinder per stroke is additionally calculated using turbine inlet pressure and turbine inlet temperature. 16. The apparatus according to claim 9, wherein the total gas charge in a cylinder per stroke is additionally calculated using turbine inlet pressure and turbine inlet temperature.
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이 특허에 인용된 특허 (4)
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Engel, Gerhard; Birk, Manfred; Meier, Frank; Bleile, Thomas; Kraus, Benedikt; Rupp, Peter; Kraemer, Wolfgang, Method and device for controlling an internal combustion engine that is provided with an air system.
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