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:
Apr. 27, 2004
Filed:
Apr. 05, 2002
Applicant:
Inventors:
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02P 5/152 ; F02P 1/704 ;
U.S. Cl.
CPC ...
F02P 5/152 ; F02P 1/704 ;
Abstract
An ignition system has an ignition circuit and an ion current detecting circuit. The ignition circuit has an ignition coil that has relatively low inductance of about less than 10 henries (H) because it is used in conjunction with a separate energy accumulating coil, and a driving circuit for a multi-spark ignition sequence. The ion current detecting circuit detects a second harmonic component of engine knock. The components of the system are designed so that the resonance frequency of an ion current path substantially coincides with the second harmonic frequency component, so that the Q-value of the ion current path is greater than 1. As a result, it is possible to improve knock detecting accuracy.