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;
an exhaust gas recirculation (EGR) device configured to introduce into the combustion chamber a portion of burned gas generated inside the combustion chamber as EGR gas;
an EGR controller configured to change an EGR ratio that is a ratio of the EGR gas introduced into the combustion chamber, the EGR controller changing the EGR ratio so that a compression start temperature of the combustion chamber rises as an engine speed increases; and
a controller connected to the injector and the spark plug, and configured to output a control signal to the injector and the spark plug, respectively, the controller including a processor configured to execute a combustion controlling module to output an ignition instruction to the spark plug so as to ignite at a given ignition timing after the EGR ratio adjustment, so that partial compression-ignition combustion in which a 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 formed by a cylinder, a piston and a cylinder head, an injector, a spark plug, an exhaust gas recirculation (EGR) device configured to introduce into the combustion chamber a portion of burned gas generated inside the combustion chamber as EGR gas, an EGR controller to change an EGR ratio, the EGR controller changing the EGR ratio so that a compression start temperature of the combustion chamber rises as an engine speed increases, and a controller connected to the injector and the spark plug to control them. The controller includes a processor configured to execute a combustion controlling module to output an ignition instruction to the spark plug so as to ignite at an ignition timing after the EGR ratio adjustment so that partial compression-ignition combustion is performed.
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Citations
12 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; an exhaust gas recirculation (EGR) device configured to introduce into the combustion chamber a portion of burned gas generated inside the combustion chamber as EGR gas; an EGR controller configured to change an EGR ratio that is a ratio of the EGR gas introduced into the combustion chamber, the EGR controller changing the EGR ratio so that a compression start temperature of the combustion chamber rises as an engine speed increases; and a controller connected to the injector and the spark plug, and configured to output a control signal to the injector and the spark plug, respectively, the controller including a processor configured to execute a combustion controlling module to output an ignition instruction to the spark plug so as to ignite at a given ignition timing after the EGR ratio adjustment, so that partial compression-ignition combustion in which a mixture gas combusts by flame propagation and then combusts by compression ignition is performed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control system for a compression-ignition engine including an injector configured to supply fuel into a combustion chamber, a spark plug configured to ignite a mixture gas containing fuel supplied from the injector and air, and an exhaust gas recirculation (EGR) device configured to add, as EGR gas, a portion of burned gas generated inside the combustion chamber to the mixture gas, 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, the control system comprising:
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an EGR controller to change an EGR ratio that is a ratio of EGR gas introduced into the combustion chamber; and a processor configured to execute a combustion controlling module to, during the partial compression-ignition combustion, adjust the EGR ratio by using the EGR controller so that a compression start temperature of the combustion chamber rises as an engine speed increases, and cause the spark plug to perform spark ignition at a given ignition timing so that the SI combustion of the mixture gas is performed followed by the CI combustion.
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Specification