Method for controlling knocking in multicylinder internal combustion engines
First Claim
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1. A method for a knock control in a multicylinder internal combustion engine, comprising the steps of:
- assigning a single knock sensor to a group of cylinders of the multicylinder internal combustion engine;
with the single knock sensor, detecting knock signals of all combustions in the group of cylinders;
transmitting the knock signals to an analyzer unit;
selecting at least one particular cylinder of the group of cylinders;
with a control unit, determining and outputting control quantities of an ignition for the at least one particular cylinder, the control quantities including a first firing angle value; and
with the control unit, driving the at least one particular cylinder as a function of the first firing angle value, wherein the first firing angle value is numerically closer, than at least one second firing angle value, to a predetermined knock limit value, the at least one second firing angle value corresponding to at least one further cylinder of the group of cylinders.
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Abstract
Method of knock control in multicylinder internal combustion engines, with one knock sensor being provided for a group of cylinders, and with a control unit determining and outputting the control quantities for the ignition of the individual cylinders on a selective basis for the cylinders. At least one cylinder, preferably the cylinder(s) sensed best by the knock sensor, is/are selected as the lead cylinder. A knocking event in a lead cylinder causes a retard in the firing for all cylinders of the group, while a knocking event in one of the other cylinders causes a retard in only this one cylinder.
17 Citations
19 Claims
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1. A method for a knock control in a multicylinder internal combustion engine, comprising the steps of:
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assigning a single knock sensor to a group of cylinders of the multicylinder internal combustion engine; with the single knock sensor, detecting knock signals of all combustions in the group of cylinders; transmitting the knock signals to an analyzer unit; selecting at least one particular cylinder of the group of cylinders; with a control unit, determining and outputting control quantities of an ignition for the at least one particular cylinder, the control quantities including a first firing angle value; and with the control unit, driving the at least one particular cylinder as a function of the first firing angle value, wherein the first firing angle value is numerically closer, than at least one second firing angle value, to a predetermined knock limit value, the at least one second firing angle value corresponding to at least one further cylinder of the group of cylinders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for a knock control in a multicylinder internal combustion engine, comprising the steps of:
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assigning a single knock sensor to a group of cylinders of the multicylinder internal combustion engine; with the single knock sensor, detecting knock signals of all combustions in the group of cylinders; transmitting the knock signals to an analyzer unit; selecting at least one particular cylinder of the group of cylinders, while leaving at least one cylinder unselected; with a control unit, determining and outputting first control quantities of an ignition for the at least one particular cylinder, the first control quantities including a first firing angle value; with the control unit, determining and outputting second control quantities of an ignition for the at least one unselected cylinder, the second control quantities including at least one secondary firing angle value, each of the at least one secondary firing angle value uniquely corresponding to one of the at least one unselected cylinder, wherein each of the at least one secondary firing angle value is, in comparison with the first firing angle value, numerically further away from a predetermined knock limit value by a predetermined offset value; and with the control unit, driving each of the at least one unselected cylinder as a function of a corresponding one of the at least one secondary firing angle value. - View Dependent Claims (11, 12, 13, 14)
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15. A method for a knock control in a multicylinder internal combustion engine operating at a high r.p.m. value, comprising the steps of:
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assigning a single knock sensor to a group of cylinders of the multicylinder internal combustion engine; with the single knock sensor, detecting knock signals of all combustions in the group of cylinders; transmitting the knock signals to an analyzer unit; selecting at least one particular cylinder of the group of cylinders; with a control unit, determining and outputting control quantities of an ignition for the at least one particular cylinder, the control quantities including a first firing angle value; and with the control unit, driving the at least one particular cylinder as a function of the first firing angle value, wherein the first firing angle value is numerically closer, than at least one second firing angle value, to a predetermined knock limit value, the at least one second firing angle value corresponding to at least one further cylinder of the group of cylinders. - View Dependent Claims (16, 17, 18, 19)
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Specification