Device and method for estimating temperature of exhaust pipe of internal combustion engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01M-015/10
G01M-015/04
출원번호
US-0478734
(2006-07-03)
등록번호
US-7316157
(2008-01-08)
우선권정보
JP-2005-194964(2005-07-04)
발명자
/ 주소
Ohsaki,Satoru
출원인 / 주소
Denso Corporation
대리인 / 주소
Nixon & Vanderhye P.C.
인용정보
피인용 횟수 :
11인용 특허 :
2
초록▼
A device for estimating a temperature of an exhaust pipe of an engine includes: a first obtaining section for obtaining a first heat amount that the exhaust pipe receives per unit time from exhaust gas of the internal combustion engine; a second obtaining section for obtaining a second heat amount t
A device for estimating a temperature of an exhaust pipe of an engine includes: a first obtaining section for obtaining a first heat amount that the exhaust pipe receives per unit time from exhaust gas of the internal combustion engine; a second obtaining section for obtaining a second heat amount that the exhaust pipe releases per the unit time to external air; and a temperature estimater estimating the temperature of the exhaust pipe based on the obtained first amount and the obtained second amount. The first obtaining section obtains the first amount based on an exhaust gas speed related value related to a speed of a flow of the exhaust gas.
대표청구항▼
What is claimed is: 1. A device for estimating a temperature of an exhaust pipe of an internal combustion engine, comprising: a first obtaining means for obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; a second obtaining
What is claimed is: 1. A device for estimating a temperature of an exhaust pipe of an internal combustion engine, comprising: a first obtaining means for obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; a second obtaining means for obtaining a second heat amount that the exhaust pipe releases to external air per the unit time; and a temperature estimation means for estimating the temperature of the exhaust pipe based on the obtained first amount and the obtained second amount, wherein the first obtaining means obtains the first amount based on a exhaust gas speed related value relating to a flow speed of the exhaust gas. 2. The device according to claim 1, wherein the first obtaining means uses a rotational speed of the internal combustion engine as the exhaust gas speed related value. 3. The device according to claim 1, wherein the first obtaining means obtains the first amount by multiplying a heat transfer coefficient between the exhaust gas and the exhaust pipe and a difference in temperature between the exhaust gas and the exhaust pipe. 4. The device according to claim 1, wherein the second obtaining means obtains the second amount by multiplying a heat transfer coefficient between the exhaust pipe and the external air and a difference in temperature between the exhaust pipe and the external air. 5. The device according to claim 1, wherein the second obtaining means obtains the second amount based on an external air speed value related to a speed of a flow of the external air. 6. The device according to claim 5, wherein the second obtaining means uses, as the external air speed related value, one of a rotational speed of a radiator fan of the internal combustion engine and a speed of a vehicle to which the internal combustion engine is installed. 7. The device according to claim 1, wherein the second obtaining means obtains the second amount based on an external gas density related value related to a density of the external air. 8. The device according to claim 7, wherein the second obtaining means uses, as the external air density related value, a division value which is obtained by dividing a pressure of the external air by a temperature of the external air. 9. The device according to claim 7, wherein the second obtaining means uses, as the external air density related value, a pressure of the external air. 10. The device according to claim 7, wherein the second obtaining means uses, as the external air density related value, one of a temperature of the external air and a temperature of intake air of the internal combustion engine. 11. A device for estimating a temperature of an exhaust pipe of an internal combustion engine having an exhaust pipe, comprising: a first obtaining means for obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; a second obtaining means for obtaining a second heat amount that the exhaust pipe releases to external air per the unit time; and a temperature estimation means for estimating the temperature of the exhaust pipe based on the obtained first amount and the obtained second amount, wherein the first obtaining means obtains the first amount based on an exhaust gas density related value relating to a density of the exhaust gas. 12. The device according to claim 11, wherein the first obtaining means uses, as the exhaust gas density related value, a pressure of the exhaust gas. 13. The device according to claim 11, wherein the first obtaining means uses, as the exhaust gas density related value, a temperature of the exhaust gas. 14. The device according to claim 11, wherein the first obtaining means uses, as the exhaust gas density related value, a division value which is obtained by dividing a pressure of the exhaust gas by a temperature of the exhaust gas. 15. The device according to claim 14, wherein the first obtaining means uses, as the pressure of the exhaust gas, a pressure of the external air. 16. The device according to claim 11, wherein the first obtaining means uses, as the exhaust gas density related value, a load on the internal combustion engine. 17. The device according to claim 16, wherein the first obtaining means uses, as the load, one of a pressure on an intake pipe of the internal combustion engine and an amount of air in a cylinder of the internal combustion engine. 18. A device for estimating a temperature of an exhaust pipe of an internal combustion engine having an exhaust pipe, comprising: a first obtaining means for repeatedly obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; a second obtaining means for repeatedly obtaining a second heat amount that the exhaust pipe releases to external air per the unit time; and a temperature estimation means for repeatedly estimating the temperature of the exhaust pipe, by estimating, based on the obtained first amount and the obtained second amount, a change of the temperature of the exhaust pipe per the unit time and by adding in series the change to an initial value for the temperature of the exhaust pipe, wherein the temperature estimation means uses, as the initial value, an estimated value for the temperature of the exhaust pipe in starting the engine, the estimated value being estimated based on a temperature of the external air, another estimated value for the temperature of the exhaust pipe and a duration within which the internal combustion engine is kept stopped, the another estimated value being estimated before the internal combustion engine lastly stops. 19. A device for estimating a temperature of an exhaust pipe of an internal combustion engine having an exhaust pipe, comprising: a first obtaining means for obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; a second obtaining means for obtaining a second heat amount that the exhaust pipe releases to external air per the unit time; and a third obtaining means for obtaining a third amount of condensed water generated in the exhaust pipe; a fourth obtaining means for obtaining, based on the obtained third amount, a fourth amount of heat that the condensed water receives; and a temperature estimation means for estimating the temperature of the exhaust pipe based on the obtained first amount, the obtained second amount and the obtained fourth amount. 20. The device according to claim 19, wherein the third obtaining means calculates, based on an amount of air inhaled to the internal combustion engine and an amount of the fuel injected in the internal combustion engine, an amount of water vapor produced through combustion reaction of the injected fuel and the inhaled air, and the third obtaining means estimates the third amount based on the calculated amount of the water vapor, a temperature of the exhaust gas and another temperature of the exhaust pipe. 21. A method for estimating a temperature of an exhaust pipe of an internal combustion engine having an exhaust pipe, comprising: obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; obtaining a second heat amount that the exhaust pipe release to external air per the unit time; and estimating the temperature of the exhaust pipe based on the obtained first amount and the obtained second amount, wherein the first amount is obtained based on a exhaust gas speed related value related to a speed of a flow of the exhaust gas. 22. A method for estimating a temperature of an exhaust pipe of an internal combustion engine having an exhaust pipe, comprising: obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; obtaining a second heat amount that the exhaust pipe releases to external air per the unit time; and estimating the temperature of the exhaust pipe based on the obtained first amount and the obtained second amount, wherein the first amount is obtained based on an exhaust gas density related value related to a density of the exhaust gas. 23. A method for estimating a temperature of an exhaust pipe of an internal combustion engine having an exhaust pipe, comprising: repeatedly obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; repeatedly obtaining a second heat amount that the exhaust pipe releases to external air per the unit time; and repeatedly estimating the temperature of the exhaust pipe, by estimating, based on the obtained first amount and the obtained second amount, a change of the temperature of the exhaust pipe per the unit time and by adding in series the change to an initial value for the temperature of the exhaust pipe, wherein an estimated value for the temperature of the exhaust pipe in starting the engine is used as the initial value, the estimated value being estimated based on a temperature of the external air, another estimated value for the temperature of the exhaust pipe and a duration within which the internal combustion engine is kept stopped, the another estimated value being estimated before the internal combustion engine lastly stops. 24. A method for estimating a temperature of an exhaust pipe of an internal combustion engine having an exhaust pipe, comprising: obtaining a first heat amount that the exhaust pipe receives from exhaust gas of the internal combustion engine per unit time; obtaining a second heat amount that the exhaust pipe releases to external air per the unit time; obtaining a third amount of condensed water generated in the exhaust pipe; obtaining, based on the obtained third amount, a fourth amount of heat that the condensed water receives; and estimating the temperature of the exhaust pipe based on the obtained first amount, the obtained second amount and the obtained fourth amount.
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이 특허에 인용된 특허 (2)
Brazeau, Craig; Robinson, James; Fairchild, Andrew, Method and apparatus for measuring effects of exhaust gas recirculation deposits.
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Emery, Pascal; Talon, Vincent, Method for estimating an engine exhaust temperature and method for diagnosing a cylinder pressure sensor using an exhaust temperature estimate.
Hegemann, Rainer; Neuberger, Eugen; Paule, Markus; Waldbuesser, Norbert, Method for operating an exhaust gas purification system of a motor vehicle combustion engine.
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