US6763799B2 — Internal combustion engine and control method of …

Claim 1

Independent Claim 166 words

An internal combustion engine having a combustion characteristic in which, when a ratio of a inert gas contained in an air-fuel mixture subjected to combustion approaches a predetermined value, an amount of a soot generated during the combustion gradually reaches a peak, and the amount of the soot generated decreases when the ratio is further increased, comprising: a control unit that switches a first combustion state in which generation of the soot is suppressed by suppressing the ratio of the inert gas below the predetermined value, and a second combustion state in which generation of the soot is suppressed by maintaining the ratio of the inert gas in a range above the predetermined value, and a fuel injection valve that executes, in addition to a main fuel injection for the internal combustion engine, a pilot injection which is a fuel injection preceding the main fuel injection and the pilot injection is stopped for a predetermined period including at least a period of the second combustion state.

Claim 2

Dependent Claim 166 words

An internal combustion engine having a combustion characteristic in which, when a ratio of a inert gas contained in an air-fuel mixture subjected to combustion approaches a predetermined value, an amount of a soot generated during the combustion gradually reaches a peak, and the amount of the soot generated decreases when the ratio is further increased, comprising: a control unit that switches a first combustion state in which generation of the soot is suppressed by suppressing the ratio of the inert gas below the predetermined value, and a second combustion state in which generation of the soot is suppressed by maintaining the ratio of the inert gas in a range above the predetermined value, and a fuel injection valve that executes, in addition to a main fuel injection for the internal combustion engine, a pilot injection which is a fuel injection preceding the main fuel injection and the pilot injection is stopped for a predetermined period including at least a period of the second combustion state.

Claim 3

Dependent Claim 40 words

The internal combustion engine according to claim 1 , wherein the fuel injection valve stops the pilot injection after an elapse of a predetermined period after a start of switching from the first combustion state to the second combustion state.

Claim 4

Dependent Claim 30 words

The internal combustion engine according to claim 1 , wherein the fuel injection valve restarts the pilot injection before switching from the second combustion state to the first combustion state.

Claim 5

Dependent Claim 116 words

The internal combustion engine according to claim 1 , wherein the inert gas is an EGR gas which flows back from an exhaust passage to an intake passage, the control unit controls a volume of the EGR gas which flows back into the intake passage, controls a volume of an air which flows into a combustion chamber through the intake passage, and once overshoot a control amount of the EGR gas volume and the air volume according to a request for switching a combustion state so as to switch the combustion state at an early stage, and the fuel injection valve stops the pilot injection after an overshoot control when switching to the second combustion state.

Claim 6

Dependent Claim 40 words

The internal combustion engine according to claim 4 , wherein the fuel injection valve restarts the pilot injection before the overshoot control is started by the control unit, when switching from the second combustion state to the first combustion state.

Claim 7

Dependent Claim 80 words

The internal combustion engine according to claim 4 , wherein the control unit temporarily increases and corrects a fuel injection volume of the main fuel injection for the internal combustion engine during the period of the second combustion state, and the fuel injection valve stops, when switching from the first combustion state to the second combustion state, the pilot injection after the overshoot control is executed by the control unit and after the fuel injection volume is increased and corrected.

Claim 8

Dependent Claim 51 words

The internal combustion engine according to claim 6 , wherein the fuel injection valve restarts, when switching from the second combustion state to the first combustion state, the pilot injection before the overshoot control is started by the control unit and before decreasing and correcting the fuel injection volume is completed.

Claim 9

Dependent Claim 84 words

The internal combustion engine according to claim 4 , wherein the control unit temporarily advances and corrects a fuel injection timing of the main fuel injection for the internal combustion engine during the period of the second combustion state, and the fuel injection valve stops, when switching from the first combustion state to the second combustion state, the pilot injection after the overshoot control is executed by the control unit and after the fuel injection timing is advanced and corrected by the control unit.

Claim 10

Dependent Claim 55 words

The internal combustion engine according to claim 8 , wherein the fuel injection valve restarts, when switching from the second combustion state to the first combustion state, the pilot injection before the overshoot control is started by the control unit and before delaying and correcting the fuel injection timing by the control unit is completed.

Claim 11

Dependent Claim 179 words

A control method of an internal combustion engine having a combustion characteristic in which, when a ratio of a inert gas contained in an air-fuel mixture subjected to combustion approaches a predetermined value, an amount of a soot generated during the combustion gradually reaches a peak, and the amount of the soot generated decreases when the ratio is further increased, comprising steps of: switching, based on a switching request signal, a combustion state between a first combustion state in which generation of the soot is suppressed by suppressing the ratio of the inert gas below the predetermined value, and a second combustion state in which generation of the soot is suppressed by maintaining the ratio of the inert gas in a range above the predetermined value, making a fuel injection system of the internal combustion engine execute, in addition to a main fuel injection for the internal combustion engine, a pilot injection which precedes the main fuel injection, and prohibiting execution of the pilot injection during a predetermined period including at least a period of the second combustion state.

Claim 12

Dependent Claim 179 words

A control method of an internal combustion engine having a combustion characteristic in which, when a ratio of a inert gas contained in an air-fuel mixture subjected to combustion approaches a predetermined value, an amount of a soot generated during the combustion gradually reaches a peak, and the amount of the soot generated decreases when the ratio is further increased, comprising steps of: switching, based on a switching request signal, a combustion state between a first combustion state in which generation of the soot is suppressed by suppressing the ratio of the inert gas below the predetermined value, and a second combustion state in which generation of the soot is suppressed by maintaining the ratio of the inert gas in a range above the predetermined value, making a fuel injection system of the internal combustion engine execute, in addition to a main fuel injection for the internal combustion engine, a pilot injection which precedes the main fuel injection, and prohibiting execution of the pilot injection during a predetermined period including at least a period of the second combustion state.

Claim 13

Dependent Claim 41 words

The control method of the internal combustion engine according to claim 10 , wherein the pilot injection is prohibited after an elapse of a predetermined period after a start of switching from the first combustion state to the second combustion state.

Claim 14

Dependent Claim 31 words

The control method of the internal combustion engine according to claim 10 , wherein the pilot injection is restarted before switching from the second combustion state to the first combustion state.

Claim 15

Dependent Claim 86 words

The control method of the internal combustion engine according to claim 10 , wherein a volume of an EGR gas in which the inert gas flows back into an intake passage is controlled, a volume of an air which flows into a combustion chamber through the intake passage is controlled, and a control amount of the EGR gas volume and the air volume is once overshot according to a request for switching the combustion state so as to switch the combustion state at an early stage.

Claim 16

Dependent Claim 30 words

The control method of the internal combustion engine according to claim 13 , wherein the pilot injection is prohibited after an overshoot control, when switching to the second combustion state.

Claim 17

Dependent Claim 37 words

The control method of the internal combustion engine according to claim 14 , wherein the pilot injection is restarted before the overshoot control is started, when switching from the second combustion state to the first combustion state.

Claim 18

Dependent Claim 83 words

The control method of the internal combustion engine according to claim 14 , wherein a fuel injection volume of the main fuel injection for the internal combustion engine is temporarily increased and corrected at the time of engine operation with the combustion state switched to the second combustion state, and, when switching from the first combustion state to the second combustion state, the pilot injection is prohibited after the overshoot control is executed and after the fuel injection volume is increased and corrected.

Claim 19

Dependent Claim 48 words

The control method of the internal combustion engine according to claim 16 , wherein the pilot injection is, when switching from the second combustion state to the first combustion state, restarted before the overshoot control is started and before decreasing and correcting the fuel injection volume is completed.

Claim 20

Dependent Claim 75 words

The control method of the internal combustion engine according to claim 14 , wherein a fuel injection timing of the main fuel injection for the internal combustion engine is temporarily advanced and corrected during the period of the second combustion state, and, when switching from the first combustion state to the second combustion state, the pilot injection is prohibited after the overshoot control is executed and after the fuel injection timing is advanced and corrected.

Claim 21

Dependent Claim 48 words

The control method of the internal combustion engine according to claim 18 , wherein the pilot injection is, when switching from the second combustion state to the first combustion state, restarted before the overshoot control is started and before delaying and correcting the fuel injection timing is completed.

Claim 22

Dependent Claim 181 words

An internal combustion engine having a combustion characteristic in which, when a ratio of a inert gas contained in an air-fuel mixture subjected to combustion approaches a predetermined value, an amount of a soot generated during the combustion gradually reaches a peak, and the amount of the soot generated decreases when the ratio is further increased, comprising: a combustion state switching system that switches a first combustion state in which generation of the soot is suppressed by suppressing the ratio of the inert gas below the predetermined value, and a second combustion state in which generation of the soot is suppressed by maintaining the ratio of the inert gas in a range above the predetermined value, a fuel injection control system that makes a fuel injection system of the internal combustion engine execute, in addition to a main fuel injection for the internal combustion engine, a pilot injection which precedes the main fuel injection, and a pilot injection control system that prohibits execution of the pilot injection during a predetermined period including at least a period of the second combustion state.

Claim 23

Dependent Claim 181 words

An internal combustion engine having a combustion characteristic in which, when a ratio of a inert gas contained in an air-fuel mixture subjected to combustion approaches a predetermined value, an amount of a soot generated during the combustion gradually reaches a peak, and the amount of the soot generated decreases when the ratio is further increased, comprising: a combustion state switching system that switches a first combustion state in which generation of the soot is suppressed by suppressing the ratio of the inert gas below the predetermined value, and a second combustion state in which generation of the soot is suppressed by maintaining the ratio of the inert gas in a range above the predetermined value, a fuel injection control system that makes a fuel injection system of the internal combustion engine execute, in addition to a main fuel injection for the internal combustion engine, a pilot injection which precedes the main fuel injection, and a pilot injection control system that prohibits execution of the pilot injection during a predetermined period including at least a period of the second combustion state.

Claim 24

Dependent Claim 41 words

The internal combustion engine according to claim 20 , wherein the pilot injection control system stops the pilot injection after an elapse of a predetermined period after a start of switching from the first combustion state to the second combustion state.

Claim 25

Dependent Claim 31 words

The internal combustion engine according to claim 20 , wherein the pilot injection control system restarts the pilot injection before switching from the second combustion state to the first combustion state.

Claim 26

Dependent Claim 125 words

The internal combustion engine according to claim 20 , wherein the inert gas is an EGR gas which flows back from an exhaust passage to an intake passage, the fuel injection control system controls a volume of the EGR gas which flows back into the intake passage, controls a volume of an air which flows into a combustion chamber through the intake passage, and once overshoot a control amount of the EGR gas volume and the air volume according to a request for switching a combustion state so as to switch the combustion state at an early stage, and the pilot injection control system prohibits the pilot injection after an overshoot control by the combustion state switching system when switching to the second combustion state.

Claim 27

Dependent Claim 43 words

The internal combustion engine according to claim 23 , wherein the pilot injection control system restarts the pilot injection before the overshoot control is started by the combustion state switching system, when switching from the second combustion state to the first combustion state.

Claim 28

Dependent Claim 91 words

The internal combustion engine according to claim 23 , wherein the fuel injection control system temporarily decreases and corrects a fuel injection volume of the main fuel injection for the internal combustion engine during the period of the second combustion state, and the pilot injection control system prohibits, when switching from the first combustion state to the second combustion state, the pilot injection after the overshoot control is executed by the combustion state switching system and after the fuel injection volume is decreased and corrected by the fuel injection control system.

Claim 29

Dependent Claim 60 words

The internal combustion engine according to claim 25 , wherein the pilot injection control system restarts, when switching from the second combustion state to the first combustion state, the pilot injection before the overshoot control is started by the combustion state switching system and before increasing and correcting the fuel injection volume by the fuel injection control system is completed.

Claim 30

Dependent Claim 91 words

The internal combustion engine according to claim 23 , wherein the fuel injection control system temporarily advances and corrects a fuel injection timing of the main fuel injection for the internal combustion engine during the period of the second combustion state, and the pilot injection control system prohibits, when switching from the first combustion state to the second combustion state, the pilot injection after the overshoot control is executed by the combustion state switching system and after the fuel injection timing is advanced and corrected by the fuel injection control system.

Claim 31

Dependent Claim 60 words

The internal combustion engine according to claim 27 , wherein the pilot injection control system restarts, when switching from the second combustion state to the first combustion state, the pilot injection before the overshoot control is started by the combustion state switching system and before delaying and correcting the fuel injection timing by the fuel injection control system is completed.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2007-07-20	2008-01-19	2008-07-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2011-07-20	2012-01-19	2012-07-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2015-07-20	2016-01-19	2016-07-20	$7700.00	Window Closed / Lapsed

Internal combustion engine and control method of the same

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