Title:
異音検知システム
Document Type and Number:
Japanese Patent JP7264088
Kind Code:
B2
Abstract:
A specific sound having a higher frequency than an operation sound of an engine is generated in synchronization with timing of a top dead center of a specific cylinder of the engine. Thus, timing of a noise of the engine is estimated by using, for example, a deviation in time between timing of generation of a specific sound and timing at which a noise occurs in the engine, based on a sound collected from around the engine without directly using a signal of a crank angle of the engine.
Inventors:
Yamashita Yosoya
Application Number:
JP2020035615A
Publication Date:
April 25, 2023
Filing Date:
March 03, 2020
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F02D45/00
Domestic Patent References:
| JP2016164405A | ||||
| JP2017102441A | ||||
| JP2009031428A | ||||
| JP2007256841A | ||||
| JP61212652A |
Attorney, Agent or Firm:
Patent Attorney Corporation ITEC International Patent Office