US 2006/0142925 A1Published application

Internal combustion engine knock determination device

AssigneeTOYOTA JIDOSHA KABUSHIKI KAISHA and DENSO CORPORATION and NIPPO SOKEN, INC.

InventorsRihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Kouzi Ohara, Kiyoshi Iwade, Shuhei Oe, Yuichi Takemura, Shigeru Kamio

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Abstract

An engine ECU executes a program including a step of calculating a knock intensity N as based on comparing a waveform detected as a waveform of a vibration attributed to knocking with a knock waveform model stored in a memory as a waveform of a vibration attributed to knocking for crank angles except for crank angles where a magnitude of a vibration not attributed to knocking is greater than a predetermined magnitude, a step of determining that the engine knocks if knock intensity N is larger than a predetermined reference value, and a step of determining that the engine does not knock if knock intensity N is not larger than a predetermined reference value.

Claims16

Dependent claims

A knock determination device for an internal combustion engine, comprising:

a first magnitude detector detecting a magnitude of a vibration of said internal combustion engine at a first frequency band;
a second magnitude detector detecting a magnitude of a vibration of said internal combustion engine at a second frequency band that is different from said first frequency band;
a crank angle detector detecting a crank angle of said internal combustion engine;
a waveform detector detecting a waveform of a vibration of said internal combustion engine at predetermined crank angle intervals as based on the magnitude of the vibration at said first frequency band;
a storage storing in advance a waveform of a vibration of said internal combustion engine;
and
a determiner determining whether said internal combustion engine knocks, as based on a result of comparing the detected waveform with the stored waveform as well as on the magnitude of the vibration at said second frequency band.

4 more elements

Dependencies are inferred from the claim text.