Control system for compression-ignition engine
First Claim
1. A control system for a compression-ignition engine, comprising:
- an engine having a combustion chamber formed by a cylinder, a piston, and a cylinder head;
an injector attached to the engine and configured to supply fuel into the combustion chamber;
a spark plug disposed to be oriented into the combustion chamber;
a swirl valve provided to an intake passage of the engine; and
a controller connected to the injector, the spark plug, and the swirl valve, and configured to output a control signal to the injector, the spark plug, and the swirl valve, respectively, the controller including a processor configured to execute;
a swirl adjusting module to adjust an opening of the swirl valve to generate a swirl flow inside the combustion chamber;
a fuel injection amount controlling module to control fuel injection amounts by the injector, of a pre-injection in which fuel is injected into the combustion chamber and a post-injection in which fuel is injected again after the pre-injection, the fuel injection amount controlling module outputting a first control instruction to the injector to increase a ratio of an injection amount of the post-injection to a total amount of fuel to be injected into the combustion chamber in one cycle as an engine speed increases within a low load side of an operating range where a partial compression-ignition combustion is performed in which the swirl flow is generated, and the fuel injection amount controlling module outputting a second control instruction to the injector to reduce the ratio of the injection amount of the post-injection to the total amount of fuel to be injected into the combustion chamber in one cycle as the engine speed increases within a high load side of the operating range where the partial compression-ignition combustion is performed in which the swirl flow is generated; and
a combustion controlling module to output an ignition instruction to the spark plug so as to ignite at a given ignition timing after the swirl generation by the swirl adjusting module and the fuel injection by the fuel injection amount controlling module, so that partial compression-ignition combustion in which the mixture gas combusts by flame propagation and then combusts by compression ignition is performed.
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Accused Products
Abstract
A control system for a compression-ignition engine is provided, which includes an engine having a combustion chamber, an injector configured to supply fuel into the combustion chamber, a spark plug, a swirl valve provided to an intake passage of the engine, and a controller. The controller includes a processor configured to execute a swirl adjusting module to adjust a swirl valve opening to generate a swirl flow inside the combustion chamber, a fuel injection amount controlling module to control fuel injection amounts of pre-injection and post-injection so as to increase a ratio of an injection amount of the post-injection to a total fuel injection amount into the combustion chamber in one cycle as an engine speed increases, and a combustion controlling module to control the spark plug to ignite at a given ignition timing after the swirl generation and fuel injection, so that partial compression-ignition combustion is performed.
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Citations
10 Claims
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1. A control system for a compression-ignition engine, comprising:
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an engine having a combustion chamber formed by a cylinder, a piston, and a cylinder head; an injector attached to the engine and configured to supply fuel into the combustion chamber; a spark plug disposed to be oriented into the combustion chamber;
a swirl valve provided to an intake passage of the engine; anda controller connected to the injector, the spark plug, and the swirl valve, and configured to output a control signal to the injector, the spark plug, and the swirl valve, respectively, the controller including a processor configured to execute; a swirl adjusting module to adjust an opening of the swirl valve to generate a swirl flow inside the combustion chamber; a fuel injection amount controlling module to control fuel injection amounts by the injector, of a pre-injection in which fuel is injected into the combustion chamber and a post-injection in which fuel is injected again after the pre-injection, the fuel injection amount controlling module outputting a first control instruction to the injector to increase a ratio of an injection amount of the post-injection to a total amount of fuel to be injected into the combustion chamber in one cycle as an engine speed increases within a low load side of an operating range where a partial compression-ignition combustion is performed in which the swirl flow is generated, and the fuel injection amount controlling module outputting a second control instruction to the injector to reduce the ratio of the injection amount of the post-injection to the total amount of fuel to be injected into the combustion chamber in one cycle as the engine speed increases within a high load side of the operating range where the partial compression-ignition combustion is performed in which the swirl flow is generated; and a combustion controlling module to output an ignition instruction to the spark plug so as to ignite at a given ignition timing after the swirl generation by the swirl adjusting module and the fuel injection by the fuel injection amount controlling module, so that partial compression-ignition combustion in which the mixture gas combusts by flame propagation and then combusts by compression ignition is performed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control system for a compression-ignition engine including an injector configured to supply fuel into a combustion chamber and a spark plug configured to ignite a mixture gas containing fuel supplied from the injector and air, the engine performing partial compression-ignition combustion including spark ignition (SI) combustion performed by combusting a portion of the mixture gas through spark ignition by the spark plug, followed by compression ignition (CI) combustion performed by causing the remaining mixture gas to self-ignite, comprising:
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a swirl mechanism configured to generate a swirl flow; and a processor configured to, during the partial compression-ignition combustion;
control the swirl mechanism to generate the swirl flow;control the injector to perform a pre-injection in which a given amount of fuel is injected into the combustion chamber and a post-injection in which fuel is injected again after the pre-injection; and output a first control instruction to the injector to increase a ratio of the injection amount of the post-injection to a total amount of fuel to be injected into the combustion chamber in one cycle as an engine speed increases within a low load side of an operating range where the partial compression-ignition combustion is performed in which the swirl flow is venerated, and output a second control instruction to the injector to reduce the ratio of the injection amount of the post-injection to the total amount of fuel to be injected into the combustion chamber in one cycle as the engine speed increases within a high load side of the operating range where the partial compression-ignition combustion is performed in which the swirl flow is generated.
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8. A control system for a compression-ignition engine, comprising:
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an engine having a combustion chamber formed by a cylinder, a piston, and a cylinder head; an injector attached to the engine and configured to supply fuel into the combustion chamber; a spark plug disposed to be oriented into the combustion chamber;
a swirl valve provided to an intake passage of the engine; anda controller connected to the injector, the spark plug, and the swirl valve, and configured to output a control signal to the injector, the spark plug, and the swirl valve, respectively, the controller including a processor configured to execute; a swirl adjusting module to adjust an opening of the swirl valve to generate a swirl flow inside the combustion chamber; a fuel injection amount controlling module to control fuel injection amounts by the injector, of a pre-injection in which fuel is injected into the combustion chamber and a post-injection in which fuel is injected again after the pre-injection, the fuel injection amount controlling module outputting a first control instruction to the injector to increase a ratio of an injection amount of the post-injection to a total amount of fuel to be injected into the combustion chamber in one cycle as an engine speed increases, and the fuel injection amount controlling module outputting a second control instruction to the injector to maintain constant the ratio of the injection amount of the post-injection to the total amount of fuel to be injected into the combustion chamber in one cycle as the engine speed increases at a high engine speed side above a first predetermined engine speed within a low load side of an operating range where a partial compression-ignition combustion is performed in which the swirl flow is generated; and a combustion controlling module to output an ignition instruction to the spark plug so as to ignite at a given ignition timing after the swirl generation by the swirl adjusting module and the fuel injection by the fuel injection amount controlling module, so that partial compression-ignition combustion in which the mixture gas combusts by flame propagation and then combusts by compression ignition is performed. - View Dependent Claims (9, 10)
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Specification