The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 1995
Filed:
May. 28, 1991
Herbert Ziegler, Straubing, DE;
Peter Schindler, Landshut, DE;
Siemens Aktiengesellschaft, Munich, DE;
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.