Kabushiki Kaisha Toyota Chuo Kenkyusho

Hiroharu Tokoro

Yujiro Oshima

Kiyokazu Asai

Akihiro Takeuchi

A method and device for detection of knocking in an internal combustion engine which can not only detect knocking but also an abnormal condition of a cooling liquid in a liquid cooled engine. The device detects the vibration or pressure fluctuations of the cooling liquid generated by both knocking and the operating of the coolant pump.

Method of and device for detection of knocking for internal combustion

A knocking detecting device for an internal combustion engine including: a casing in the form of an annular member fastened substantially perpendicularly to an outer sidewall of the engine block; a support member made of a vibration-isolating material such as rubber or synthetic resin, and having one end fastened to the casing and the other end projecting a predetermined distance from the outer sidewall of the engine block to a position within a water chamber or a coolant water passage; a pressure-sensitive member including pressure-sensitive surfaces mounted on the projecting end of the support member, facing away from each other and extending perpendicularly to the outer sidewall of the engine block, for detecting as a change in an electrical signal pressure vibrations transmitted as a knocking sound to the pressure-sensitive surfaces through coolant water from the partition when knocking is produced in the combustion chamber; and lead wires for delivering the electrical signal change responsive to the knocking. This device enables effective detection of only the knocking produced in the combustion chamber as the pressure vibrations in the coolant water.

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Kariya, Japan

Hiroharu Tokoro