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:
Feb. 19, 2002
Filed:
Feb. 08, 2000
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A combustion state detecting apparatus for an internal combustion engine which can ensure adequate thermal insulation between a transformer and a bias circuit and which can be manufactured in a miniaturized structure. The apparatus includes a transformer ( ) having a primary winding ( ) and a secondary winding ( ) which are so electromagnetically coupled mutually that upon interruption of a current flowing through the primary winding, a high voltage is induced at a high-potential end of the secondary winding, a switch ( ) for controllably interrupting the current flowing through the primary winding, a spark plug ( ) for generating a spark discharge in response to application of the high voltage at the high-potential end of the secondary winding, a bias circuit ( ) for applying to a low-potential end of the secondary winding a voltage of plus polarity for detecting ions produced when the spark discharge occurs at the spark plug, and an outer packaging case ( ) for accommodating therein the transformer, the switch and the bias circuit, wherein the bias circuit is disposed within the outer packaging case at a location adjacent to the switch remote from the transformer, and wherein the outer packaging case is filled with a moldable resin ( ).