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:
May. 08, 2012
Filed:
Nov. 13, 2007
Tatsuhiko Ebara, Fujisawa, JP;
Tomoko Ohta, Fujisawa, JP;
Tatsuhiko Ebara, Fujisawa, JP;
Tomoko Ohta, Fujisawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
A diagnostic apparatus () in which a drive circuit () is configured of switching means () for supplying an electric current to a linear solenoid valve and variably regulating a valve opening degree on the basis of inputted ON-OFF signals, current detection means () for detecting an electric current flowing from the switching means () to the linear solenoid valve (), and control means () for outputting ON-OFF signals to the switching means () on the basis of a detected current value from the current detection means () so that the linear solenoid valve has a target opening degree, and which diagnoses a ground short between the drive circuit () and the linear solenoid valve (), the diagnostic apparatus including ground short detection means () for detecting a switching of ON-OFF signals inputted in the switching means () and determining a ground short fault when the number of ON-OFF switching cycles per a predetermined interval is equal to or less than a predetermined number of cycles.