CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
First Claim
1. A control device for an internal combustion engine having a low-speed pre-ignition region in which a possibility of an occurrence of pre-ignition increases, in a low-rotation and high-load region, comprising:
- ignition means for igniting an air-fuel mixture taken into a cylinder of the internal combustion engine;
deposit removal control means for forcefully advancing ignition timing by the ignition means at a predetermined control interval to generate a maximum in-cylinder pressure that is higher than at a time of ordinary combustion in an operation region and is lower than at a time of occurrence of pre-ignition, when the operation region is in a region other than the low-speed pre-ignition region and in a forceful knock enabling region with a load equal to or higher than a lower limit load at which knocking can be forcefully generated by advance of the ignition timing; and
control interval correction means for making the control interval longer as the load of the operation region is higher, and making the control interval shorter as the load of the operation region is lower.
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Accused Products
Abstract
An object of the invention is to provide a control device for an internal combustion engine that regularly and forcefully removes deposit that is accumulated in cylinders and restrains consecutive occurrences of pre-ignition beforehand. The internal combustion engine has a low-speed pre-ignition region in which a possibility of occurrence of pre-ignition increases, in a low-rotation and high-load region. Ignition means (16) for igniting an air-fuel mixture taken into the cylinders is included. When an operation region is in a region other than the low-speed pre-ignition region and in a forceful knock enabling region with a load equivalent to or higher than a lower limit load at which knocking can be forcefully generated by advance of ignition timing, the ignition timing by the ignition means is forcefully advanced at a predetermined control interval, and a maximum in-cylinder pressure that is higher than at a time of ordinary combustion in the operation region and is lower than at a time of occurrence of pre-ignition is generated. The control interval is made longer as a load of the operation region is higher, and the control interval is made shorter as the load of the operation region is lower.
43 Citations
14 Claims
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1. A control device for an internal combustion engine having a low-speed pre-ignition region in which a possibility of an occurrence of pre-ignition increases, in a low-rotation and high-load region, comprising:
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ignition means for igniting an air-fuel mixture taken into a cylinder of the internal combustion engine; deposit removal control means for forcefully advancing ignition timing by the ignition means at a predetermined control interval to generate a maximum in-cylinder pressure that is higher than at a time of ordinary combustion in an operation region and is lower than at a time of occurrence of pre-ignition, when the operation region is in a region other than the low-speed pre-ignition region and in a forceful knock enabling region with a load equal to or higher than a lower limit load at which knocking can be forcefully generated by advance of the ignition timing; and control interval correction means for making the control interval longer as the load of the operation region is higher, and making the control interval shorter as the load of the operation region is lower. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control device for an internal combustion engine having a low-speed pre-ignition region in which a possibility of an occurrence of pre-ignition increases, in a low-rotation and high-load region, comprising:
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an ignition unit for igniting an air-fuel mixture taken into a cylinder of the internal combustion engine; and a controller that is programmed to; execute a deposit removal control for forcefully advancing ignition timing by the ignition unit at a predetermined control interval, to generate a maximum in-cylinder pressure that is higher than at a time of ordinary combustion in an operation region and is lower than at a time of occurrence of pre-ignition, when the operation region is in a region other than the low-speed pre-ignition region and in a forceful knock enabling region with a load equal to or higher than a lower limit load at which knocking can be forcefully generated by advance of the ignition timing; and execute a control interval correction for making the control interval longer as the load of the operation region is higher, and making the control interval shorter as the load of the operation region is lower. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification