Angular speed detection device

Patent metadata

Field	Value
Publication number	US-9939267-B2
Application number	US-201515304640-A
Country	US
Kind code	B2
Filing date	Apr 8, 2015
Priority date	Apr 25, 2014
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

The purpose of the present invention is to provide an inertial force detection device that can more accurately detect faults in a temperature sensor. Provided is an inertial force detection device configured so that in a state where an oscillating body is made to oscillate in a first direction, the amount of displacement when the oscillating body is displaced in a second direction due to the generation of angular velocity is detected as angular velocity, wherein the inertial force detection device has a means for performing control so that the oscillating body enters a state of resonance in the first direction, a temperature detection means for detecting temperature, and a means for detecting faults in the temperature detection means, and outputs a plurality of signals, which indicate the fault detection results of the three means, continuously from a single signal wire.

First claim

The invention claimed is:

1. An inertial force detection apparatus configured to detect a displacement amount when an oscillating body oscillating in a first direction is displaced in a second direction due to generation of angular velocity, as an angular velocity, the inertial force detection apparatus comprising:
a unit configured to control such that the oscillating body comes into a resonance state in the first direction;
a temperature detection unit configured to detect temperature; and
a unit configured to detect a failure in the temperature detection unit,
wherein a plurality of signals indicating failure detection results of the three units is sequentially output from one signal line.

2. The inertial force detection apparatus according to claim 1 ,
wherein a failure in the temperature detection unit is detected on the basis of a signal supplied to cause the oscillating body to oscillate in the first direction, a signal attributed to displacement of the oscillating body, generated by the oscillation in the first direction, and a signal output by the temperature detection unit.

3. The inertial force detection apparatus according to claim 1 ,
wherein the unit configured to detect a failure in the temperature detection unit includes a unit that generates a failure determination threshold that changes in accordance with the temperature, a threshold comparison unit that compares output of the temperature detection unit with the failure determination threshold, determines that the result is normal when the output is in a failure determination threshold range, and determines that the result is a failure when the output is out of the range, and
the signal generated in a unit configured to detect a failure in the unit that generates a failure determination threshold and the signal generated in a unit configured to detect a failure in the threshold comparison unit, are output as a failure detection result of the unit configured to detect a failure in the temperature detection unit.

4. The inertial force detection apparatus according to claim 1 ,
wherein determination of a change from a non-resonance state to a resonance state, of the oscillating body, is performed before failure detection of the temperature detection unit is performed.

5. The inertial force detection apparatus according to claim 1 ,
wherein the plurality of sequential signals corresponds to a signal indicating whether the oscillating body is in a resonance state and to a signal indicating a failure detection result of the temperature detection unit.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Nakamura Toshiaki
• Jeong Heewon
• Hayashi Masahide

Classifications

• G01C19/5726 Primary

  Signal processing · CPC title

• H01L29/84

  Electricity · mapped topic

• H10D48/50

  Devices controlled by mechanical forces, e.g. pressure · CPC title