Control apparatus for internal combustion engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-025/07
F02M-051/00
F02B-047/08
F02B-047/00
G06F-019/00
출원번호
US-0628494
(2005-09-13)
등록번호
US-7383118
(2008-06-03)
우선권정보
JP-2004-267794(2004-09-15)
국제출원번호
PCT/JP05/017219
(2005-09-13)
§371/§102 date
20061205
(20061205)
국제공개번호
WO06/030933
(2006-03-23)
발명자
/ 주소
Imai,Daichi
Nakayama,Shigeki
Fukuma,Takao
출원인 / 주소
Toyota Jidosha Kabushiki Kaisha
대리인 / 주소
Oliff & Berridge, PLC
인용정보
피인용 횟수 :
14인용 특허 :
6
초록▼
This control apparatus obtains a relation (trade-off line) between NOx generation amount and PM generation amount with EGR ratio serving as a parameter from an NOx generation amount estimation model which calculates the NOx generation amount on the basis of the oxygen mole concentration of intake ga
This control apparatus obtains a relation (trade-off line) between NOx generation amount and PM generation amount with EGR ratio serving as a parameter from an NOx generation amount estimation model which calculates the NOx generation amount on the basis of the oxygen mole concentration of intake gas and a PM generation amount estimation model which calculates the PM generation amount on the basis of an excess air factor. Further, the control apparatus obtains a straight line (ratio determination line) which passes through a point (appropriate point A) corresponding to a combination of steady-condition appropriate values of the NOx generation amount and the PM generation amount under the present operating conditions and which has a slope K determined in consideration of a regulation value based on a law relating to emission control. The control apparatus uses an intersection (target point B) between the trade-off line and the ratio determination line as an emission target value, and sets an EGR ratio target value Regrt to an EGR ratio corresponding to the target point B.
대표청구항▼
The invention claimed is: 1. A control apparatus for an internal combustion engine which includes an EGR passage for connecting an exhaust passage and an intake passage of the engine and an EGR control valve disposed in the EGR passage and adapted to control a flow rate of EGR gas flowing from the
The invention claimed is: 1. A control apparatus for an internal combustion engine which includes an EGR passage for connecting an exhaust passage and an intake passage of the engine and an EGR control valve disposed in the EGR passage and adapted to control a flow rate of EGR gas flowing from the exhaust passage to the intake passage, the control apparatus comprising: operating-condition obtainment means for obtaining operating conditions of the engine; EGR-ratio-obtainment-value obtainment means for obtaining, as an EGR ratio obtainment value, an EGR ration on the basis of the obtained operating conditions, the EGR ratio being a ratio of a flow rate of EGR gas taken in a cylinder of the engine to a flow rate of gas taken in the cylinder of the engine; relation obtainment means for obtaining, on the basis of the obtained operating conditions, a relation between NOx generation amount and PM generation amount in the obtained operating conditions; generation ratio determination means for determining a ratio between the NOx generation amount and the PM generation amount; EGR-ratio-target-value determination means for determining a target value of the EGR ratio from the obtained relation and the determined ratio; and EGR-control-valve control means for controlling the opening of the EGR control valve such that the EGR ratio obtainment value coincides with the EGR ratio target value. 2. A control apparatus for an internal combustion engine according to claim 1, wherein the relation obtainment means obtains the relation between the NOx generation amount and the PM generation amount by making use of an NOx generation amount estimation model which calculates the NOx generation amount on the basis of an intake-gas oxygen concentration, which is an oxygen concentration of gas taken into the cylinder of the engine, and a PM generation amount estimation model which calculates the PM generation amount on the basis of an excess air factor of the gas taken into the cylinder of the engine. 3. A control apparatus for an internal combustion engine according to claim 1, further comprising: required-fuel-injection-quantity determination means for determining a required fuel injection quantity, which is a quantity of fuel to be injected, on the basis of the obtained operating conditions; and cylinder-interior-intake-gas-quantity determination means for determining a cylinder interior intake gas quantity, which is a quantity of gas taken into the cylinder of the engine, on the basis of the obtained operating conditions, wherein the relation obtainment means obtains the relation between the NOx generation amount and the PM generation amount by making use of the determined required fuel injection quantity and the calculated cylinder interior intake gas quantity. 4. A control apparatus for an internal combustion engine according to claim 1, wherein the generation ratio determination means determines the ratio between the NOx generation amount and the PM generation amount by making use of a relation of two combinations that is a relation between a combination of the total NOx generation amount and the total PM generation amount previously measured when the engine is operated in accordance with a predetermined pattern, and a predetermined combination regarding a regulation value of the NOx generation amount and a regulation value of the PM generation amount. 5. A control apparatus for an internal combustion engine according to claim 1, wherein the generation ratio determination means determines the ratio between the NOx generation amount and the PM generation amount by making use of a relation of two combinations that is a relation between a combination of the NOx generation amount and the PM generation amount previously measured when the engine is operated steady in the obtained operating conditions, and a predetermined combination regarding a regulation value of the NOx generation amount and a regulation value of the PM generation amount. 6. A control apparatus for an internal combustion engine according to claim 5, further comprising steady-condition-appropriate-value obtainment means for obtaining, on the basis of the obtained operating conditions, the NOx generation amount and the PM generation amount previously determined such that the their combination becomes optimal when the engine is operated steady in the obtained operating conditions, as a steady-condition appropriate NOx generation amount and a steady-condition appropriate PM generation amount, respectively, wherein the generation ratio determination means determines the ratio between the NOx generation amount and the PM generation amount by making use of a formula representing a straight line which passes through a point corresponding to a combination of the obtained steady-condition appropriate NOx generation amount and steady-condition appropriate PM generation amount and which has a slope representing a ratio of an increase in the PM generation amount to an increase in the NOx generation amount, the ratio being obtained from the relation of the two combinations; and the EGR-ratio-target-value determination means determines the EGR ratio target value from the formula representing the relation between the NOx generation amount and the PM generation amount obtained by means of the relation obtainment means and the formula representing the straight line used by means of the generation ratio determination means. 7. A control apparatus for an internal combustion engine according to claim 1, wherein the EGR-ratio-target value determination means sets the EGR ratio target value to zero when the determined EGR ratio target value is negative. 8. A control apparatus for an internal combustion engine according to claim 7, further comprising: required-fuel-injection-quantity determination means for determining a required fuel injection quantity, which is a quantity of fuel to be injected, on the basis of the obtained operating conditions; fuel injection instruction means for instructing injection of fuel in the determined required fuel injection quantity; and fuel-injection-quantity-limit-value obtainment means, operable when the EGR ratio target value determined by means of the EGR-ratio-target-value determination means becomes negative, for obtaining, as a fuel injection quantity limit value, a fuel injection quantity required to obtain a relation between the NOx generation amount and the PM generation amount for bringing the EGR ratio target value determined by means of the EGR-ratio-target-value determination means to zero, while maintaining the ratio between the NOx generation amount and the PM generation amount determined by means of the generation ratio determination means, wherein, the fuel injection instruction means instructs injection of fuel in a quantity corresponding to the obtained fuel injection quantity limit value, instead of instructing injection of fuel in the determined required fuel injection quantity, when the EGR ratio target value determined by means of the EGR-ratio-target-value determination means becomes negative.
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이 특허에 인용된 특허 (6)
Sczomak David P. (Troy MI) Peden Richard A. (Livonia MI), Closed-loop control of a diesel engine.
Stewart,Gregory E.; Kolavennu,Soumitri N.; Borrelli,Francesco; Hampson,Gregory J.; Shahed,Syed M.; Samad,Tariq; Rhodes,Michael L., Multivariable control for an engine.
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