CONTROLLER FOR INTERNAL COMBUSTION ENGINE
First Claim
1. A controller for an internal combustion engine which is provided with at least a direct fuel injector for a direct fuel injection, the controller comprising:
- a variable valve timing controller adjusting a valve timing of an intake valve and/or an exhaust valve;
a self-ignited combustion control means for performing a self-ignited combustion of an air-fuel mixture by compressing the air-fuel mixture in a compression stroke when a driving region of the internal combustion engine is in a specified self-ignited combustion region; and
a fuel reform degree detecting means for detecting a reform degree of the fuel injected into a cylinder by a fuel-reform injection, whereinthe self-ignited combustion control means controls the variable valve timing controller in such a manner as to establish a negative valve overlap period where the exhaust valve and the intake valve are closed at least in a posterior half of an exhaust stroke,the self-ignited combustion control means performs the fuel-reform injection in which the fuel is injected into a cylinder for reforming a fuel during the negative valve overlap period,the self-ignited combustion control means performs an output-control injection in which the fuel is injected into the cylinder or an intake port for controlling an output of the internal combustion engine after the fuel-reform injection is performed, andthe self-ignited combustion control means corrects a fuel injection quantity of the output-control injection based on the reform degree of the fuel.
1 Assignment
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Accused Products
Abstract
When a driving region of an engine is in a specified self-ignited combustion region, a valve timing is controlled in such a manner as to establish a negative valve overlap period in which an exhaust valve and an intake valve are closed. During the negative valve overlap period, a direct injection is performed to reform a fuel. After the direct injection, a port injection is performed to control an output. Thereby, a self-ignited combustion control is performed. During the self-ignited combustion control, a fuel reform degree of the fuel injected by the direct fuel injection is detected, and a self-ignited combustion condition in a present combustion cycle is estimated based on the fuel reform degree detected in the present combustion cycle. A fuel injection quantity of the intake port fuel injection is corrected according to the estimated self-ignited combustion condition in order to stabilize the self-ignited combustion condition.
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Citations
8 Claims
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1. A controller for an internal combustion engine which is provided with at least a direct fuel injector for a direct fuel injection, the controller comprising:
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a variable valve timing controller adjusting a valve timing of an intake valve and/or an exhaust valve; a self-ignited combustion control means for performing a self-ignited combustion of an air-fuel mixture by compressing the air-fuel mixture in a compression stroke when a driving region of the internal combustion engine is in a specified self-ignited combustion region; and a fuel reform degree detecting means for detecting a reform degree of the fuel injected into a cylinder by a fuel-reform injection, wherein the self-ignited combustion control means controls the variable valve timing controller in such a manner as to establish a negative valve overlap period where the exhaust valve and the intake valve are closed at least in a posterior half of an exhaust stroke, the self-ignited combustion control means performs the fuel-reform injection in which the fuel is injected into a cylinder for reforming a fuel during the negative valve overlap period, the self-ignited combustion control means performs an output-control injection in which the fuel is injected into the cylinder or an intake port for controlling an output of the internal combustion engine after the fuel-reform injection is performed, and the self-ignited combustion control means corrects a fuel injection quantity of the output-control injection based on the reform degree of the fuel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A controller for an internal combustion engine provided with at least a direct fuel injector for a direct fuel injection, the controller comprising:
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a variable valve timing controller adjusting a valve timing of an intake valve and/or an exhaust valve; a self-ignited combustion control means for performing a self-ignited combustion of an air-fuel mixture by compressing the air-fuel mixture in a compression stroke when a driving region of the internal combustion engine is in a specified self-ignited combustion region; and a fuel reform degree detecting means for detecting a reform degree of the fuel injected into a cylinder by the fuel-reform injection, wherein the self-ignited combustion control means controls the variable valve timing controller in such a manner as to establish a negative valve overlap period where the exhaust valve and the intake valve are closed at least in a posterior half of an exhaust stroke, the self-ignited combustion control means performs a fuel-reform injection in which the fuel is injected into a cylinder for reforming a fuel during the negative valve overlap period, the self-ignited combustion control means performs an output-control injection in which the fuel is injected into the cylinder for controlling an output of the internal combustion engine after the fuel-reform injection is performed, and the self-ignited combustion control means performs a correcting fuel injection in which the fuel is injected into the intake port or the cylinder in order to correct the fuel injection quantity of the fuel-reform injection based on the reform degree of the fuel.
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Specification