Control Apparatus for an Internal Combustion Engine Capable of Pre-Mixed Charge Compression Ignition
First Claim
1. A control apparatus for an internal combustion engine, the internal combustion engine capable of a pre-mixed charge compression ignition combustion and having 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 and the air-fuel mixture gas is self-ignited to be combusted by compressing the air-fuel mixture gas during a compression stroke, when a driving condition of the engine is within a self-ignition area, comprising:
- temperature un-uniformity adding means for acting on the air-fuel mixture gas to enhance temperature un-uniformity of the air-fuel mixture gas at a predetermined acting timing which is within a middle phase of the compression stroke and prior to fuel pyrolysis starting timing, if the compression stroke is divided into an early phase of the compression stroke, the middle phase of the compression stroke, and a late phase of the compression stroke, the early phase of the compression stroke being a period in which mixing of the air-fuel mixture gas proceeds rapidly due to a turbulent flow in the combustion chamber, the middle phase of the compression stroke being a period in which the mixing of the air-fuel mixture gas proceeds relatively moderately and a the combustion reaction becomes more active gradually, and the late phase of the compression stroke being a period in which an explosive combustion reaction occurs, in such a manner that the temperature un-uniformity of the air-fuel mixture gas at the fuel pyrolysis starting timing which is within a compression stroke is made greater than temperature un-uniformity of the air-fuel mixture gas at the fuel pyrolysis starting timing obtained only by simply compressing the air-fuel mixture gas during the compression stroke, and so that the combustion is more moderate than combustion which occurs only by simply compressing the air-fuel mixture gas during the compression stroke.
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Accused Products
Abstract
An electric control device 70 is applied to an internal combustion engine 10 capable of a pre-mixed charge compression ignition combustion in which air-fuel mixture gas including air and fuel injected from an injector 37 is formed in a combustion chamber 25, and the air-fuel mixture gas is self-ignited to be combusted by compressing the air-fuel mixture gas during a compression stroke. The electric control device injects high pressure fluid such as air from the air injection valve 38 into the air-fuel mixture gas at a predetermined acting timing within a compression stroke prior to fuel pyrolysis starting timing to enhance the temperature un-uniformity of the air-fuel mixture gas. This enables the temperature un-uniformity of the air-fuel mixture gas at the fuel pyrolysis starting timing to become larger than the temperature un-uniformity of the air-fuel mixture gas at the fuel pyrolysis starting timing obtained only by simply compressing the air-fuel mixture gas during the compression stroke. As a result, the combustion is moderated and the combustion noise is reduced.
29 Citations
25 Claims
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1. A control apparatus for an internal combustion engine, the internal combustion engine capable of a pre-mixed charge compression ignition combustion and having 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 and the air-fuel mixture gas is self-ignited to be combusted by compressing the air-fuel mixture gas during a compression stroke, when a driving condition of the engine is within a self-ignition area, comprising:
temperature un-uniformity adding means for acting on the air-fuel mixture gas to enhance temperature un-uniformity of the air-fuel mixture gas at a predetermined acting timing which is within a middle phase of the compression stroke and prior to fuel pyrolysis starting timing, if the compression stroke is divided into an early phase of the compression stroke, the middle phase of the compression stroke, and a late phase of the compression stroke, the early phase of the compression stroke being a period in which mixing of the air-fuel mixture gas proceeds rapidly due to a turbulent flow in the combustion chamber, the middle phase of the compression stroke being a period in which the mixing of the air-fuel mixture gas proceeds relatively moderately and a the combustion reaction becomes more active gradually, and the late phase of the compression stroke being a period in which an explosive combustion reaction occurs, in such a manner that the temperature un-uniformity of the air-fuel mixture gas at the fuel pyrolysis starting timing which is within a compression stroke is made greater than temperature un-uniformity of the air-fuel mixture gas at the fuel pyrolysis starting timing obtained only by simply compressing the air-fuel mixture gas during the compression stroke, and so that the combustion is more moderate than combustion which occurs only by simply compressing the air-fuel mixture gas during the compression stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 13, 17, 18, 25)
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10. 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. - View Dependent Claims (11, 12)
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14. 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. - View Dependent Claims (15, 16)
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19. 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 angle different from said predetermined crank angle, if the operating mode of the engine is said spark-ignition mode. - View Dependent Claims (20, 21, 22)
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23. 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;
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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.
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24. 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.
- 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;
Specification