IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0005738
(2007-12-28)
|
등록번호 |
US-7725244
(2010-06-14)
|
우선권정보 |
JP-2006-355542(2006-12-28) |
발명자
/ 주소 |
- Itoga, Chiho
- Ogawa, Ken
- Kitamura, Toru
- Shinohara, Toshinari
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
3 |
초록
▼
A control apparatus and method for an internal combustion engine are provided for ensuring a stable combustion state and improving the fuel efficiency when an air-fuel mixture is burnt with self ignition while auxiliarily using a spark ignition. The control apparatus for an internal combustion engin
A control apparatus and method for an internal combustion engine are provided for ensuring a stable combustion state and improving the fuel efficiency when an air-fuel mixture is burnt with self ignition while auxiliarily using a spark ignition. The control apparatus for an internal combustion engine which is operated in a plurality of modes including a torch self ignition combustion mode comprises an ECU. In the torch self ignition combustion mode, the ECU controls an internal EGR amount, calculates an actual exhaust closing angle, calculates a target exhaust closing angle, calculates a closing angle deviation, calculates a fuel injection amount for forming a homogeneous air-fuel mixture, calculates a correction coefficient in accordance with the closing angle deviation, and corrects a basic value by the correction coefficient to calculate a fuel injection amount for forming a stratified air-fuel mixture.
대표청구항
▼
What is claimed is: 1. A control apparatus for an internal combustion engine which is operated in a plurality of combustion modes including a torch self ignition combustion mode which involves changing a remaining amount of previously burnt gas generated within a cylinder as an internal EGR amount
What is claimed is: 1. A control apparatus for an internal combustion engine which is operated in a plurality of combustion modes including a torch self ignition combustion mode which involves changing a remaining amount of previously burnt gas generated within a cylinder as an internal EGR amount by an internal EGR device, forming an air-fuel mixture including both a stratified air-fuel mixture and a homogeneous air-fuel mixture by a fuel injection by a fuel injection device, burning the stratified air-fuel mixture with a spark ignition, and burning the homogeneous air-fuel mixture with self ignition using the burning stratified air-fuel mixture as a torch, said control apparatus comprising: internal EGR control means for controlling the internal EGR amount by diving said internal EGR device; actual internal EGR amount parameter calculating means for calculating an actual internal EGR amount parameter indicative of an actual internal EGR amount which is an estimate of the internal EGR amount, said actual internal EGR amount parameter calculated based on an actual exhaust closing angle of an exhaust valve in the internal combustion engine; target internal EGR amount parameter calculating means for calculating a target internal EGR amount parameter which is a target for the actual internal EGR amount parameter; index value calculating means for calculating one of a relative deviation and ratio between the calculated target internal EGR amount parameter and the calculated actual internal EGR amount parameter, as an index value; fuel injection amount calculating means for calculating fuel injection amounts for producing a homogeneous air-fuel mixture and for producing a stratified air-fuel mixture, respectively, and calculating the fuel injection amount for producing a stratified air-fuel mixture in accordance with the calculated index value when in the torch self ignition combustion mode; and fuel injection control means for injecting a fuel of the calculated fuel injection amount for producing a homogeneous air-fuel mixture at a timing for producing a homogeneous air-fuel mixture, and injecting the fuel of the calculated fuel injection amount for producing a stratified air-fuel mixture at a timing for producing a stratified air-fuel mixture by driving said fuel injection device, wherein said fuel injection amount calculating means include correcting means for correcting, when the index value indicates that the target internal EGR amount parameter exceeds the actual internal EGR amount parameter in the torch self ignition combustion mode, the fuel injection amount for producing the stratified air-fuel mixture to be larger as the exceeding degree is larger. 2. A control apparatus for an internal combustion engine according to claim 1, further comprising: failure determining means for determining that said internal EGR device has failed when the index value indicates that the target internal EGR amount parameter exceeds the actual internal EGR amount parameter to a predetermined degree or more, wherein said fuel injection amount calculating means sets the fuel injection amount for producing a stratified air-fuel mixture to the value of zero when said failure determining means determines that said internal EGR device has failed. 3. A control apparatus for an internal combustion engine according to claim 1, wherein said failure determining means determines that said internal EGR device has failed when the index value remains indicating, for a predetermined time or more, that the target internal EGR amount parameter exceeds the actual internal EGR amount parameter to a predetermined degree or more. 4. A control apparatus for an internal combustion engine according to claim 1, further comprising: operating condition parameter detecting means for detecting an operating condition parameter indicative of an actual operating condition of said internal EGR device, wherein said actual internal EGR amount parameter calculating means calculates the actual internal EGR amount parameter in accordance with the detected operating condition parameter. 5. A control apparatus for an internal combustion engine according to claim 1, wherein said actual internal EGR amount parameter calculating means calculates the actual internal EGR amount parameter as an actual in-cylinder gas temperature which is an estimate of an unburnt gas temperature within the cylinder. 6. A control method for an internal combustion engine which is operated in a plurality of combustion modes including a torch self ignition combustion mode which involves changing a remaining amount of previously burnt gas generated within a cylinder as an internal EGR amount by an internal EGR device, forming an air-fuel mixture including both a stratified air-fuel mixture and a homogeneous air-fuel mixture by a fuel injection by a fuel injection device, burning the stratified air-fuel mixture with a spark ignition, and burning the homogeneous air-fuel mixture with self ignition using the burning stratified air-fuel mixture as a torch, said control method comprising the steps of: controlling the internal EGR amount by driving said internal EGR device; calculating an actual internal EGR amount parameter indicative of an actual internal EGR amount which is an estimate of the internal EGR amount, said actual internal EGR amount parameter calculated based on an actual exhaust closing angle of an exhaust valve in the internal combustion engine; calculating a target internal EGR amount parameter which is a target for the actual internal EGR amount parameter; calculating one of a relative deviation and ratio between the calculated target internal EGR amount parameter and the calculated actual internal EGR amount parameter, as an index value; calculating fuel injection amounts for producing a homogeneous air-fuel mixture and for producing a stratified air-fuel mixture, respectively, and calculating the fuel injection amount for producing a stratified air-fuel mixture in accordance with the calculated index value when in the torch self ignition combustion mode; and injecting a fuel of the calculated fuel injection amount for producing a homogeneous air-fuel mixture at a timing for producing a homogeneous air-fuel mixture, and injecting the fuel of the calculated fuel injection amount for producing a stratified air-fuel mixture at a timing for producing a stratified air-fuel mixture by driving said fuel injection device, wherein said fuel injection amount calculating step includes the step of correcting, when the index value indicates that the target internal EGR amount parameter exceeds the actual internal EGR amount parameter in the torch self ignition combustion mode, the fuel injection amount for producing the stratified air-fuel mixture to be larger as the exceeding degree is larger. 7. A control method for an internal combustion engine according to claim 6, further comprising the step of: determining that said internal EGR device has failed when the index value indicates that the target internal EGR amount parameter exceeds the actual internal EGR amount parameter to a predetermined degree or more, wherein said fuel injection amount calculating step includes setting the fuel injection amount for producing a stratified air-fuel mixture to the value of zero when said failure determining step determines that said internal EGR device has failed. 8. A control method for an internal combustion engine according to claim 6, wherein said failure determining step includes determining that said internal EGR device has failed when the index value remains indicating, for a predetermined time or more, that the target internal EGR amount parameter exceeds the actual internal EGR amount parameter to a predetermined degree or more. 9. A control method for an internal combustion engine according to claim 6, further comprising the step of: detecting an operating condition parameter indicative of an actual operating condition of said internal EGR device, wherein said actual internal EGR amount parameter calculating step includes calculating the actual internal EGR amount parameter in accordance with the detected operating condition parameter. 10. A control method for an internal combustion engine according to claim 6, wherein said actual internal EGR amount parameter calculating step includes calculating the actual internal EGR amount parameter as an actual in-cylinder gas temperature which is an estimate of an unburnt gas temperature within the cylinder.
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