Title:
オープンコレクタ方式の回転センサの自己診断回路
Document Type and Number:
Japanese Patent JP6673154
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a self-diagnostic circuit of an open collector type rotation sensor which detects a short circuit abnormality of the rotation sensor to report it.SOLUTION: The self-diagnostic circuit of the open collector type rotation sensor includes: a detection circuit 3 which detects a first signal output from a collector terminal of a first switch element Q1 and a second signal output from a collector terminal of a second switch element Q2; a switch element Q3 having a control terminal to input a short circuit detection signal so as to determine whether the collector terminals of the first switch element Q1 and the second switch element Q2 are short-circuited; and a control circuit 4 which outputs the short circuit detection signal to the control terminal, setting it at a high level, during a short circuit detection time of one or more cycles of the first or second signal at a start time of the short circuit detection and determines that the collector terminals of the first switch element Q1 and the second switch element Q2 are short-circuited when the first signal and the second signal are at a low level during the short circuit detection time.SELECTED DRAWING: Figure 1
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Inventors:
Nao Matsumoto
Application Number:
JP2016221527A
Publication Date:
March 25, 2020
Filing Date:
November 14, 2016
Export Citation:
Assignee:
KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
International Classes:
G01D5/244; G01D5/12; G01R31/50
Domestic Patent References:
| JP11037797A | ||||
| JP63234171A | ||||
| JP2010203903A |
Foreign References:
| US20100201350 |
Attorney, Agent or Firm:
Yoshiyuki Osuga