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. 03, 2009
Filed:
Aug. 19, 2008
Marcus Heller, Farmington Hills, MI (US);
Jody Nelson, West Bloomfield, MI (US);
Marcus Heller, Farmington Hills, MI (US);
Jody Nelson, West Bloomfield, MI (US);
Daimler AG, Stuttgart, DE;
Abstract
In a method for detecting an inverter hardware failure in an electric power train comprising high voltage cables, at least one electric machine and at least two inverter legs with two power electronic switches respectively for pulse-width-modulating a DC voltage from a high voltage battery for energizing the at least one electric machine, and including at least one mid-pack voltage sensor for detecting isolation faults, wherein all power electronic switches are demanded to open; at least one of the power electronic switches of one of the inverter legs is opened and closed at a time at a given duty cycle and a given frequency; a mid-pack voltage is measured using the mid-pack voltage sensor; the closed switch is identified as functional in case a common mode voltage is detected by the mid-pack voltage sensor or otherwise the closed switch is identified as non-functional.