Method and circuit for detecting an open resolver exciter line

US10495684B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Benjamin Lechner · Bad Liebenzell, DE
• Daniel Raichle · Lambach, DE
• Daniel Zirkel · Mühlacker, DE
• Michael Ungermann · Gelnhausen, DE

Key dates

• Filing date: Jun 7, 2016
• Grant date: Dec 3, 2019
• Expiry date: Dec 12, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B7/30
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for detecting an open resolver exciter line (10) comprises the following steps: —measuring the signal voltages Us and Uc of the sine coil (17) and the cosine coil (18) of the resolver (15); —comparing the amplitude Us2+Uc2 of the resolver signal to a first threshold value CS1; —starting a diagnostic mode having the following steps if the amplitude Us2+Uc2 does not reach the first threshold value CS1; —applying a constant voltage to the exciter line (11, 12) via a series resistance (25) RLE that is large compared to the ohmic resistance of the exciter coil (16) RE; —measuring the voltage difference UE(t1) at the terminals (5, 6) of the exciter line at a number of points in time ti during at least one excitation period; and —determining the DC voltage component UE,Offs of the voltage difference UE; —determining that there is an open exciter line (10) if, during the excitation period, the DC voltage component UE,Offs is larger than a second threshold value CS2.