Patent US6622690B2 successfully refreshed from Google Patents.
US6622690B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct injection type internal combustion engine and controlling method therefor
Assignee: Mitsubishi Motors Corp
•
Filing: 2001-06-08
•
Granted: 2003-09-23
•
Expires: 2021-06-08
Abstract
Abstract A direct injection type internal combustion engine has an intake and exhaust mechanism for intaking and exhausting air for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following the second expansion stroke so that the first compression stroke, a first expansion stroke, a second compression stroke, and the second expansion stroke can be repeated sequentially along with rotation of a crank shaft; and a control device for controlling fuel injection. The control device injects first fuel during the first compression stroke and injects second fuel during the first expansion stroke or the second compression stroke. Therefore, the first fuel executes the first combustion process, and the second fuel is then injected into burnt gases generated in the first combustion process to enable a second combustion process following the first combustion process.
Inventors
- 👤 Hiromitsu Ando
- 👤 Jun Takemura
- 👤 Kazunari Kuwabara
- 👤 Shigeo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:10
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/3011; F02D41/3064; F02B; F02B3/00; F02B3/06; F02B3/10; F02B3/12; F02B69/00; F02B69/06; F02D41/3017; F02D41/3058; F02D41/38; F02D41/40; F02D41/402; F02B1/00; F02B1/02; F02B1/04; F02B1/12; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B75/12; F02B2075/125; F02D2041/389; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
134 words
A direct injection internal combustion engine, comprising: an intake and exhaust mechanism for intaking and exhausting air for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following said second expansion stroke so that said first compression stroke, a first expansion stroke, a second compression stroke, and said second expansion stroke, constituting an irregular four-cycle operation, can be repeated sequentially along with rotation of a crank shaft in said internal combustion engine; and a control device for controlling injection of fuel supplied to at least a combustion chamber in said internal combustion engine, said control device injecting first fuel during said first compression stroke, and injecting second fuel during one of said first expansion stroke and said second compression stroke.
Claim 2
Dependent Claim
134 words
A direct injection internal combustion engine, comprising: an intake and exhaust mechanism for intaking and exhausting air for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following said second expansion stroke so that said first compression stroke, a first expansion stroke, a second compression stroke, and said second expansion stroke, constituting an irregular four-cycle operation, can be repeated sequentially along with rotation of a crank shaft in said internal combustion engine; and a control device for controlling injection of fuel supplied to at least a combustion chamber in said internal combustion engine, said control device injecting first fuel during said first compression stroke, and injecting second fuel during one of said first expansion stroke and said second compression stroke.
Claim 3
Dependent Claim
53 words
A direct injection internal combustion engine according to claim 1 , wherein said control device burns said first fuel, injected during said first compression stroke, by a first spark ignition and burns said second fuel, injected into burnt gases generated during a combustion process of said first fuel, by a second spark ignition.
Claim 4
Dependent Claim
52 words
A direct injection internal combustion engine according to claim 1 , wherein said control device burns said first fuel, injected during said first compression stroke, by a spark ignition, and burns said second fuel, injected into burnt gases generated during a combustion process of said first fuel, by a compression self ignition.
Claim 5
Dependent Claim
36 words
A direct injection internal combustion engine according to claim 1 , wherein said intake and exhaust mechanism starts an exhaust operation earlier than an intake operation, and finish said intake operation later than said exhaust operation.
Claim 6
Dependent Claim
21 words
A direct injection internal combustion engine according to claim 1 , further comprising: a supercharging device disposed in an intake system.
Claim 7
Dependent Claim
122 words
A direct injection internal combustion engine according to claim 1 , wherein said intake and exhaust mechanism includes an adjustable valve mechanism that switches an operation mode between a normal operation mode for carrying out a normal four-cycle operation, wherein an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke are sequentially repeated along with rotation of said crank shaft, and an irregular operation mode for carrying out an irregular operation, wherein said first compression stroke, said first expansion stroke, said second compression stroke, and said second expansion stroke are sequentially repeated; and said control device selects said normal four-cycle operation in said normal operation mode at least when said internal combustion engine is operating under a high load.
Claim 8
Dependent Claim
48 words
A direct injection internal combustion engine according to claim 1 , wherein said control device carries out an open-loop controlling operation such that a total fuel amount of said first fuel and said second fuel has a predetermined air-fuel ratio with respect to an amount of intake air.
Claim 9
Dependent Claim
63 words
A direct injection internal combustion engine according to claim 7 , wherein said control device controls an amount of said first fuel to a value between about {fraction (1/10)} and about ½ of said total fuel amount, and controls an amount of said second fuel to a differential fuel amount between said total fuel amount and the amount of said first fuel injected.
Claim 10
Dependent Claim
121 words
A direct injection internal combustion engine according to claim 7 , wherein said control device determines whether said second fuel can be burned by a compression self ignition according to at least one of the following: a rotational speed of said internal combustion engine, a load on said internal combustion engine, a ratio of said first fuel amount to said second fuel amount, an air-fuel ratio during burning of said first fuel, and an injection timing of said second fuel, and said control device burns said second fuel, injected in one of said first expansion stroke and said second compression stroke, by a spark ignition when it is determined that said second fuel cannot be burned by the compression self ignition.
Claim 11
Dependent Claim
77 words
A direct injection internal combustion engine according to claim 7 , wherein said control device makes said second fuel burnable by a compression self ignition by controlling at least one of the following: the rotational speed of said internal combustion engine, the load on said internal combustion engine, a ratio of said first fuel amount to said second fuel amount, an air-fuel ratio during burning of said first fuel, and an injection timing of said second fuel.
Claim 12
Dependent Claim
53 words
A direct injection internal combustion engine according to claim 1 , wherein said control device injects said first fuel during said first compression stroke such that said first fuel performs a stratified charge combustion, and injects said second fuel in said first expansion stroke such that said second fuel performs a uniform combustion.
Claim 13
Independent Claim
110 words
A method for controlling a direct injection internal combustion engine, comprising: carrying out an intake operation and an exhaust operation for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following said second expansion stroke to sequentially repeat said first compression stroke, a first expansion stroke, a second compression stroke, and said second expansion stroke, constituting an irregular four-cycle operation, along with rotation of a crank shaft in said internal combustion engine; injecting first fuel during said first compression stroke; and injecting second fuel during one of said first expansion stroke and said second compression stroke.
Claim 14
Independent Claim
110 words
A method for controlling a direct injection internal combustion engine, comprising: carrying out an intake operation and an exhaust operation for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following said second expansion stroke to sequentially repeat said first compression stroke, a first expansion stroke, a second compression stroke, and said second expansion stroke, constituting an irregular four-cycle operation, along with rotation of a crank shaft in said internal combustion engine; injecting first fuel during said first compression stroke; and injecting second fuel during one of said first expansion stroke and said second compression stroke.
Claim 15
Dependent Claim
70 words
The method for controlling a direct injection internal combustion engine according to claim 12 , further comprising: burning said first fuel from said first compression stroke to said first expansion stroke by injecting said first fuel during said first compression stroke; and burning said second fuel from said second compression stroke to said second expansion stroke by injecting said second fuel into burnt gases generated in said first combustion process.
Claim 16
Dependent Claim
55 words
The method for controlling a direct injection internal combustion engine according to claim 12 , further comprising: burning said first fuel, injected during said first compression stroke, by a first spark ignition; and burning said second fuel, injected into burnt gases generated during a combustion process of said first fuel, by a second spark ignition.
Claim 17
Dependent Claim
54 words
The method for controlling a direct injection internal combustion engine according to claim 12 , further comprising: burning said first fuel, injected during said first compression stroke, by a spark ignition; and burning said second fuel, injected into burnt gases generated during a combustion process of said first fuel, by a compression self ignition.
Claim 18
Dependent Claim
118 words
The method for controlling a direct injection internal combustion engine according to claim 12 , further comprising: switching an operation mode between a normal operation mode for carrying out a normal four-cycle operation, wherein an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke are sequentially repeated along with rotation of said crank shaft in said internal combustion engine, and an irregular operation mode for carrying out an irregular operation, wherein said first compression stroke, said first expansion stroke, said second compression stroke, and said second expansion stroke are sequentially repeated; and selecting said normal four-cycle operation in said normal operation mode at least when said internal combustion engine is operating under a high load.
Claim 19
Dependent Claim
50 words
The method for controlling a direct injection internal combustion engine according to claim 12 , further comprising: carrying out an open-loop controlling operation such that a total fuel amount of said first fuel and said second fuel has a predetermined air-fuel ratio with respect to an amount of intake air.
Claim 20
Dependent Claim
65 words
The method for controlling a direct injection internal combustion engine according to claim 12 , further comprising: controlling an amount of said first fuel to a value between about {fraction (1/10)} and about ½ of said total fuel amount, and controlling an amount of said second fuel to a differential fuel amount between said total fuel amount and the amount of said first fuel injected.
Claim 21
Dependent Claim
122 words
The method for controlling a direct injection internal combustion engine according to claim 12 , further comprising: determining whether said second fuel can be burned by a compression self ignition according to at least one of the following: a rotational speed of said internal combustion engine, a load on said internal combustion engine, a ratio of said first fuel amount to said second fuel amount, an air-fuel ratio during burning of said first fuel, and an injection timing of said second fuel; and burning said second fuel, injected in at least one of said first expansion stroke and said second compression stroke, by a spark ignition when it is determining that said second fuel cannot be burned by the compression self ignition.
Claim 22
Dependent Claim
72 words
The method for controlling a direct injection internal combustion engine according to claim 12 , wherein said step of injecting first fuel includes the step of, injecting said first fuel during said first compression stroke such that said first fuel performs stratified charge combustion, and said step of injecting second fuel includes the step of, injecting said second fuel in said first expansion stroke such that said second fuel performs uniform combustion.
Claim 23
Dependent Claim
160 words
A direct injection internal combustion engine, comprising: an intake and exhaust mechanism for intaking and exhausting air for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following said second expansion stroke so that said first compression stroke, a first expansion stroke, a second compression stroke, and said second expansion stroke can be repeated sequentially along with rotation of a crank shaft in said internal combustion engine; and a control device for controlling injection of fuel supplied to at least a combustion chamber in said internal combustion engine, said control device injecting first fuel during said first compression stroke, and injecting second fuel during one of said first expansion stroke and said second compression stroke when a rotational speed of said internal combustion engine is lower than a first predetermined value and a load on said internal combustion engine is lower than a second predetermined value.
Claim 24
Dependent Claim
160 words
A direct injection internal combustion engine, comprising: an intake and exhaust mechanism for intaking and exhausting air for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following said second expansion stroke so that said first compression stroke, a first expansion stroke, a second compression stroke, and said second expansion stroke can be repeated sequentially along with rotation of a crank shaft in said internal combustion engine; and a control device for controlling injection of fuel supplied to at least a combustion chamber in said internal combustion engine, said control device injecting first fuel during said first compression stroke, and injecting second fuel during one of said first expansion stroke and said second compression stroke when a rotational speed of said internal combustion engine is lower than a first predetermined value and a load on said internal combustion engine is lower than a second predetermined value.
Claim 25
Independent Claim
136 words
A method for controlling a direct injection internal combustion engine, comprising: carrying out an intake operation and an exhaust operation for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following said second expansion stroke to sequentially repeat said first compression stroke, a first expansion stroke, a second compression stroke, and said second expansion stroke along with rotation of a crank shaft in said internal combustion engine; injecting first fuel during said first compression stroke; and injecting second fuel during one of said first expansion stroke and said second compression stroke when a rotational speed of said internal combustion engine is lower than a first predetermined value and a load on said internal combustion engine is lower than a second predetermined value.
Claim 26
Independent Claim
136 words
A method for controlling a direct injection internal combustion engine, comprising: carrying out an intake operation and an exhaust operation for a predetermined period of time between a second half of a second expansion stroke and a first half of a first compression stroke following said second expansion stroke to sequentially repeat said first compression stroke, a first expansion stroke, a second compression stroke, and said second expansion stroke along with rotation of a crank shaft in said internal combustion engine; injecting first fuel during said first compression stroke; and injecting second fuel during one of said first expansion stroke and said second compression stroke when a rotational speed of said internal combustion engine is lower than a first predetermined value and a load on said internal combustion engine is lower than a second predetermined value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-09-22 | 2007-03-24 | 2007-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-09-22 | 2011-03-24 | 2011-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-09-22 | 2015-03-24 | 2015-09-23 | $7700.00 | Window Closed / Lapsed |