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:
Nov. 21, 1989
Filed:
Mar. 02, 1988
Kevin Cockerham, Sutton Coldfield, GB;
Lucas Industries public limited company, Birmingham, GB;
Abstract
A knock detection system for an internal combustion engine comprises an input for receiving a signal from a vibration sensing transducer and two bandpass filters and connected to the input. A first bandpass filter passes a band of frequencies containing the characteristic knock frequency, so that it passes the knock-representing component together with noise. The second bandpass filter passes an adjacent band of frequencies having substantially no knock component content but a noise component corresponding to that passed by the first filter. The outputs of the two bandpass filters are referenced to each other (e.g. by rectifying their outputs on opposite polarities and summing) to cancel out the noise and provide a signal which represents the knock component included in the output from the vibration-sensing transducer.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile