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A system for detecting the intensity of knocking of an internal combustion engine such as an automotive gasoline engine, comprising a vibration sensing device attached to an engine body and electrical circuitry for producing a knock-indicating signal based on a comparison of a vibration-indicating s

A system for detecting the intensity of knocking of an internal combustion engine such as an automotive gasoline engine, comprising a vibration sensing device attached to an engine body and electrical circuitry for producing a knock-indicating signal based on a comparison of a vibration-indicating signal derived from the vibration sensing device with a reference signal which is variable depending on the rate of engine revolution. The vibration sensing device comprises a vibration pickup such as of an accelerometer type, preferably mounted on a resonance plate which is fixed only at its one end to the engine body, and is made to have a resonance frequency within a frequency band of vibrations attributable to knocking of the engine, such as 5 to 10 KHz, so that no band-pass filter is needed in this system.

대표청구항 ▼

A system for detecting the degree of knocking of an internal combustion engine, the system comprising: a vibration sensing device which is attached to a body of an internal combustion engine and comprises a vibration pickup which has a housing and a seismic mass resiliently held in said housing and

A system for detecting the degree of knocking of an internal combustion engine, the system comprising: a vibration sensing device which is attached to a body of an internal combustion engine and comprises a vibration pickup which has a housing and a seismic mass resiliently held in said housing and is capable of converting mechanical vibrations into electrical signals, and a resonance plate means fixed only in one end region thereof to said body of said engine for mechanically amplifying only those vibrations having a frequency within a band attributable to knocking of said engine, said housing of said vibration pickup being fixedly mounted on said resonance plate in a free end region distant from said one end region, said vibration sensing device, as an assembly of said pickup and said resonance plate, having a resonance frequency within a frequency band of vibrations attributable to knocking of said engine; reference signal producing means for producing an electrical reference signal which is variable depending on the rate of revolution of said engine; and signal treatment means for producing an electrical knock-indicating signal which represents the degree of knocking of said engine based on a comparison of an electrical vibration-indication signal derived from said vibration sensing device with said reference signal.