DIAGNOSTIC DEVICE - HITACHI AUTOMOTIVE SYSTEMS LTD

Title:

DIAGNOSTIC DEVICE

Document Type and Number:

WIPO Patent Application WO/2014/156291

Kind Code:

A1

Abstract:

A diagnostic device capable of accurately diagnosing the soundness of a resolver circuit is provided. A shifter (101) receives excitation signal (EXC+) and excitation signal (EXC-); shifts the level of excitation signal (EXC+), excitation signal (EXC-), or both; and performs level shifting such that a period of time (∆T) that starts with one of two times in which, in the vicinity of the peak value of excitation signal (EXC+), excitation signal (EXC+) and excitation signal (EXC-) are at the same value and ends with the other of the two times is less than a prescribed threshold. A trigger generation circuit (102) generates a trigger (Trg) during said period of time (∆T). A control unit (103) determines whether there is an abnormality in the resolver circuit on the basis of the trigger (Trg).

Inventors:

GOTO KOSEI (JP)
SHIGETA SATORU (JP)
OKABE ATSUSHI (JP)
MYOEN KOHEI (JP)
TAKAMUNE YUUICHIROU (JP)

Application Number:

PCT/JP2014/052191

Publication Date:

October 02, 2014

Filing Date:

January 31, 2014

Export Citation:

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Assignee:

HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

International Classes:

G01D5/20; G01D5/244

Foreign References:

JP2005308634A	2005-11-04
JP3402207B2	2003-05-06
JP3402207B2	2003-05-06

Other References: