Control apparatus for an internal combustion engine capable of pre-mixed charge compression ignition

A control apparatus for an internal combustion engine,

• the internal combustion engine including:
• fuel injection means for injecting fuel into a combustion chamber defined by a cylinder and a piston;
• spark ignition means exposed to the combustion chamber;
• and
• high pressure water injection means for injecting high pressure water into the combustion chamber;
• the engine being a 2-cycle engine that repeats an expansion stroke, an exhaust stroke, a scavenging stroke, an intake stroke, and a compression stroke every 360° crank angle, and being operated under either one of a pre-mixed charge self-ignition mode and a spark-ignition mode,
• wherein the engine is operated under the pre-mixed charge self-ignition mode if a driving condition of the engine is within a self-ignition area, in which air-fuel mixture gas including at least air and the fuel injected by the fuel injection means is formed in the combustion chamber prior to the beginning of the compression stroke and the formed air-fuel mixture gas is self-ignited to be combusted by being compressed during the compression stroke and,
• wherein the engine is operated under the spark-ignition mode if the driving condition of the engine is within a spark-ignition area which is an area other than said self-ignition area, in which air-fuel mixture gas including at least air and the fuel injected by the fuel injection means is spark-ignited by spark by said spark ignition means to be combusted after the air-fuel mixture gas is compressed during the compression stroke;
• the control apparatus comprising:
• high pressure water injection control means
• for injecting said high pressure water from said high pressure water injection means at a predetermined acting timing within a compression stroke prior to a fuel pyrolysis starting timing, if the operating mode of the engine is said pre-mixed charge self-ignition mode, and
• for injecting said high pressure water from said high pressure water injection means during one of periods of the scavenging stroke, the intake stroke, and a period which partially overlaps both of the scavenging stroke and the intake stroke, if the operating mode of the engine is said spark-ignition mode.

A control apparatus for an internal combustion engine,

• the internal combustion engine including:
• fuel injection means for injecting fuel into a combustion chamber defined by a cylinder and a piston;
• spark ignition means exposed to the combustion chamber;
• and
• high pressure liquid fuel injection means for injecting into the combustion chamber high pressure liquid fuel including alcohol which is harder to be self-ignited than the fuel;
• the engine being a 2-cycle engine which repeats an expansion stroke, an exhaust stroke, a scavenging stroke, an intake stroke, and a compression stroke every 360° crank angle, and being operated under either one of a pre-mixed charge self-ignition mode and a spark-ignition mode,
• wherein the engine is operated under the pre-mixed charge self-ignition mode if a driving condition of the engine is within a self-ignition area, in which area fuel mixture gas including at least air and the fuel injected by the fuel injection means is formed in the combustion chamber prior to the beginning of the compression stroke and the formed air-fuel mixture gas is self-ignited to be combusted by being compressed during the compression stroke, and
• wherein the engine is operated under the spark-ignition mode if the driving condition of the engine is within a spark-ignition area which is an area other than said self-ignition area, in which air-fuel mixture gas including at least air and fuel injected by the fuel injection means is spark-ignited by spark by said spark ignition means to be combusted after the air-fuel mixture gas is compressed during the compression stroke;
• the control apparatus comprising:
• high pressure liquid fuel injection control means for injecting said high pressure liquid fuel from said high pressure liquid fuel injection means at a predetermined acting timing within a compression stroke prior to a fuel pyrolysis starting timing, if the operating mode of the engine is said pre-mixed charge self-ignition mode, and for injecting said high pressure liquid fuel from said high pressure liquid fuel injection means during one of periods of the scavenging stroke, the intake stroke, and a period which partially overlaps both of the scavenging stroke and the intake stroke, if the operating mode of the engine is said spark-ignition mode.

A control apparatus for an internal combustion engine,

• the internal combustion engine including:
• fuel injection means for injecting fuel into a combustion chamber defined by a cylinder and a piston;
• spark ignition means exposed to the combustion chamber;
• and
• high pressure fluid injection means for injecting high pressure fluid into the combustion chamber;
• the engine being operated under either one of a pre-mixed charge self-ignition mode and a spark-ignition mode,
• if a driving condition of the engine is within a self-ignition area, the engine being operated under the pre-mixed charge self-ignition mode in which air-fuel mixture gas including at least air and the fuel injected by the fuel injection means is formed in the combustion chamber prior to the beginning of a compression stroke and the formed air-fuel mixture gas is self-ignited to be combusted, and
• if the driving condition of the engine is within a spark-ignition area which is an area other than said self-ignition area, the engine being operated under the spark-ignition mode in which air-fuel mixture gas including at least air and the fuel injected by the fuel injection means is spark-ignited by spark by said spark ignition means to be combusted after the air-fuel mixture gas is compressed during the compression stroke;
• the control apparatus comprising:
• high pressure fluid injection control means for injecting said high pressure fluid from said high pressure fluid injection means when crank angle reaches a predetermined crank angle, if the operating mode of the engine is said pre-mixed charge self-ignition mode, and for injecting said high pressure fluid from said high pressure fluid injection means when crank angle reaches another predetermined crank angie different from said predetermined crank angle, if the operating mode of the engine is said spark-ignition mode.

A control apparatus for an internal combustion engine, the internal combustion engine capable of a pre-mixed charge compression ignition combustion and having a fuel injection means for injecting fuel into a combustion chamber defined by a cylinder and a piston, wherein air-fuel mixture gas including at least air and fuel injected by the fuel injection means is formed in the combustion chamber prior to beginning of a compression stroke and the air-fuel mixture gas is self-ignited to be combusted by compressing the air-fuel mixture gas during the compression stroke, when a driving condition of the engine is within a self-ignition area;

• the control apparatus comprising:
• fuel injection control means
• for injecting from said fuel injection means a part of fuel of an fuel amount required by the engine prior to the beginning of the compression stroke and injecting from said fuel injection means the rest of the fuel of the amount required by the engine at a predetermined timing within the compression stroke prior to a fuel pyrolysis starting timing of said injected fuel, if a load of the engine is in a high load area where the load is higher than a high load threshold,
• for injecting from said fuel injection means all of fuel of the fuel amount required by the engine prior to the compression stroke, if the load of the engine is in a middle load area where the load is higher than a middle load threshold which is lower than said high load threshold, and
• for injecting from said fuel injection means all of fuel of the fuel amount required by the engine during the compression stroke, if the load of the engine is in a low load area where the load is lower than said middle load threshold.

A control apparatus for an internal combustion engine having fuel injection means for injecting fuel into a combustion chamber defined by a cylinder and a piston, the engine being a 2-cycle engine that repeats an expansion stroke, an exhaust stroke, a scavenging stroke, an intake stroke, and a compression stroke every 360° crank angle, wherein air-fuel mixture gas including at least air and fuel injected by the fuel injection means is formed in the combustion chamber prior to beginning of the compression stroke, and the air-fuel mixture gas is self-ignited to be combusted by compressing the air-fuel mixture gas during the compression stroke, when a driving condition of the engine is within a self-ignition area, comprising:

• fuel injection control means
• for injecting from said fuel injection means a part of fuel of an fuel amount required by the engine during one of periods of the scavenging stroke, the intake stroke, and a period which partially overlaps both of the scavenging stroke and the intake stroke, and injecting from said fuel injection means the rest of the fuel of the amount required by the engine at a predetermined timing within the compression stroke prior to a fuel pyrolysis starting timing of said injected fuel, if a load of the engine is in a high load area where the load is higher than a high load threshold,
• for injecting from said fuel injection means all of fuel of the fuel amount required by the engine during one of periods of the scavenging stroke, the intake stroke, and a period which partially overlaps both of the scavenging stroke and the intake stroke, if the load of the engine is in a middle load area where the load is higher than a middle load threshold which is lower than said high load threshold, and
• for injecting from said fuel injection means all of fuel of the fuel amount required by the engine during the compression stroke, if the load of the engine is in a low load area where the load is lower than said middle load threshold.