Method for cylinder-selective knock control in internal combustion engines
First Claim
1. A method for cylinder-selective knock control in internal combustion engines, which comprises:
- sampling a sensor signal of at least one knocking sensor after amplification and preparation at a predetermined frequency within a measurement window being predetermined for each firing cycle, to form sampled values,determining a knocking value from a mean value of a predetermined number of greatest sampled values,ascertaining a noise value by forming a sliding mean value from a predetermined number of previous knocking values,forming an actual noise value from the cylinder-selective noise values,reading a command noise value being dependent on at least one noise-determining engine parameter out of a performance graph,comparing the actual noise value and the command noise value.processing the comparison in a controller to produce a correction factor, andlinking the correction factor with a pilot value being read out of a pilot performance graph and being dependent on at least one noise-determining engine parameter, to produce a total amplification factor for the sensor signal.
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Accused Products
Abstract
The method includes sampling a sensor signal of at least one knocking sensor after amplification and preparation at a predetermined frequency within a measurement window being predetermined for each firing cycle, to form sampled values. A knocking value is determined from a mean value of a predetermined number of greatest sampled values. A noise value is ascertained by forming a sliding mean value from a predetermined number of previous knocking values. An actual noise value is formed from the cylinder-selective noise values. A command noise value being dependent on at least one noise-determining engine parameter is read out of a performance graph. A difference between or a ratio of the actual noise value and the command noise value is formed. The comparison is processed in a controller to produce a correction factor. The correction factor is linked with a pilot value being read out of a pilot performance graph and being dependent on at least one noise-determining engine parameter, to produce a total amplification factor for the sensor signal.
42 Citations
14 Claims
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1. A method for cylinder-selective knock control in internal combustion engines, which comprises:
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sampling a sensor signal of at least one knocking sensor after amplification and preparation at a predetermined frequency within a measurement window being predetermined for each firing cycle, to form sampled values, determining a knocking value from a mean value of a predetermined number of greatest sampled values, ascertaining a noise value by forming a sliding mean value from a predetermined number of previous knocking values, forming an actual noise value from the cylinder-selective noise values, reading a command noise value being dependent on at least one noise-determining engine parameter out of a performance graph, comparing the actual noise value and the command noise value. processing the comparison in a controller to produce a correction factor, and linking the correction factor with a pilot value being read out of a pilot performance graph and being dependent on at least one noise-determining engine parameter, to produce a total amplification factor for the sensor signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification