System and method for enhanced combustion control in an internal combustion engine
First Claim
1. A system for enhanced combustion control in an internal combustion engine having at least one cylinder, a reciprocating piston within the cylinder to define a combustion chamber therein, comprising:
- a fuel supply system having a fuel injector positioned to directly inject fuel into the combustion chamber, the fuel supply system being capable of performing a split injection wherein a first fuel injection in each engine cycle precedes a second fuel injection that occurs during compression stroke in the same engine cycle;
a spark plug positioned to produce a spark to ignite a first air/fuel mixture portion created due to the second fuel injection to initiate a first stage combustion, the first stage combustion elevating temperature and pressure high enough to cause auto-ignition of a second air/fuel mixture portion surrounding the first air-fuel mixture portion to initiate an auto-ignited second stage combustion; and
an engine controller programmed to perform control over beginning time of the auto-ignited second stage combustion in response to at least one of the engine speed and engine load.
1 Assignment
0 Petitions
Accused Products
Abstract
A fuel supply system has a fuel injector positioned to directly inject fuel into a combustion chamber, and it is capable of performing a split injection wherein a first fuel injection in each engine cycle precedes a second fuel injection that occurs during compression stroke in the same engine cycle. A spark plug produces a spark to ignite a first air/fuel mixture portion created due to the second fuel injection, initiating a first stage combustion. The first stage combustion raises temperature and pressure high enough to cause auto-ignition of a second air/fuel mixture portion surrounding the first air-fuel mixture portion, initiating a second stage combustion. This control is accomplished by varying at least one of a fuel injection timing of the first fuel injection, a fuel injection timing of the second fuel injection, spark timing, a proportion of fuel quantity of the second fuel injection to the total fuel injected in each engine cycle, and an EGR rate in response to at least one of engine speed and load.
-
Citations
19 Claims
-
1. A system for enhanced combustion control in an internal combustion engine having at least one cylinder, a reciprocating piston within the cylinder to define a combustion chamber therein, comprising:
-
a fuel supply system having a fuel injector positioned to directly inject fuel into the combustion chamber, the fuel supply system being capable of performing a split injection wherein a first fuel injection in each engine cycle precedes a second fuel injection that occurs during compression stroke in the same engine cycle;
a spark plug positioned to produce a spark to ignite a first air/fuel mixture portion created due to the second fuel injection to initiate a first stage combustion, the first stage combustion elevating temperature and pressure high enough to cause auto-ignition of a second air/fuel mixture portion surrounding the first air-fuel mixture portion to initiate an auto-ignited second stage combustion; and
an engine controller programmed to perform control over beginning time of the auto-ignited second stage combustion in response to at least one of the engine speed and engine load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for enhanced combustion control in an internal combustion engine having at least one cylinder, a reciprocating piston within the cylinder to define a combustion chamber therein, comprising:
-
performing a split injection wherein a first fuel injection in each engine cycle precedes a second fuel injection that occurs during compression stroke in the same engine cycle;
producing a spark to ignite a first air/fuel mixture portion created due to the second fuel injection to initiate a first stage combustion, thereby to cause elevation of temperature and pressure high enough to cause auto-ignition of a second air/fuel mixture portion surrounding the first air-fuel mixture portion to initiate an auto-ignited second stage combustion;
determining beginning time of the auto-ignited second stage combustion in response to at least one of the engine speed and engine load; and
performing control over at most an injection timing of the first fuel injection, an injection timing of the second fuel injection, a spark timing, a proportion of fuel quantity of the second fuel injection to the total quantity injected in each engine cycle, and an exhaust gas recirculation (EGR) rate to cause the auto-ignited second stage combustion to begin at the determined beginning time.
-
-
17. A system for enhanced combustion control in an internal combustion engine having at least one cylinder, a reciprocating piston within the cylinder to define a combustion chamber therein, comprising:
-
means for performing a split injection wherein a first fuel injection in each engine cycle precedes a second fuel injection that occurs during compression stroke in the same engine cycle;
means for producing a spark to ignite a first air/fuel mixture portion created due to the second fuel injection to initiate a first stage combustion, thereby to cause elevation of temperature and pressure high enough to cause auto-ignition of a second air/fuel mixture portion surrounding the first air-fuel mixture portion to initiate an auto-ignited second stage combustion;
means for determining beginning time of the auto-ignited second stage combustion in response to at least one of the engine speed and engine load; and
means for performing control over at most an injection timing of the first fuel injection, an injection timing of the second fuel injection, a spark timing, a proportion of fuel quantity of the second fuel injection to the total quantity injected in each engine cycle, and an exhaust gas recirculation (EGR) rate to cause the auto-ignited second stage combustion to begin at the determined beginning time.
-
-
18. A system for enhanced combustion control in an internal combustion engine having at least one cylinder, a reciprocating piston within the cylinder to define a combustion chamber therein, comprising:
-
a fuel supply system having a fuel injector positioned to directly inject fuel into the combustion chamber, the fuel supply system being capable of performing a split injection wherein a first fuel injection in each engine cycle precedes a second fuel injection that occurs during compression stroke in the same engine cycle;
spark plug positioned to produce a spark to ignite a first air/fuel mixture portion created due to the second fuel injection to initiate a first stage combustion, thereby to cause elevation of temperature and pressure high enough to cause auto-ignition of a second air/fuel mixture portion surrounding the first air-fuel mixture portion to initiate an auto-ignited second stage combustion;
an engine controller; and
computer readable storage media having data stored therein representing instructions executable by the engine controller to perform control over beginning time of the auto-ignited second stage combustion in response to at least one of the engine speed and engine load. - View Dependent Claims (19)
instructions for determining beginning time of the auto-ignited second stage combustion in response to at least one of the engine speed and engine load; and
instructions for performing control over at most an injection timing of the first fuel injection, an injection timing of the second fuel injection, a spark timing, a proportion of fuel quantity of the second fuel injection to the total quantity injected in each engine cycle, and an exhaust gas recirculation (EGR) rate to cause the auto-ignited second stage combustion to begin at the determined beginning time.
-
Specification