초록 ▼

A spectral method, and corresponding system, for knock detection includes acquiring (603) spectral energy associated with vibration caused by a knocking condition from a running engine. Preferably, a sampled data system (105) acquires the spectral energy by converting an output from an accelerometer

A spectral method, and corresponding system, for knock detection includes acquiring (603) spectral energy associated with vibration caused by a knocking condition from a running engine. Preferably, a sampled data system (105) acquires the spectral energy by converting an output from an accelerometer (101) into data samples (103) in a digital form. Then from the acquired spectral energy, a knock variable is derived from magnitudes of spectral components, representing a characteristic of a combustion chamber located within the running engine. In a preferred embodiment the knock variable is derived from magnitudes of spectral components related by ratios corresponding to Bessel function coefficients. The preferred embodiment includes a Digital Signal Processor (109) applying a Fast Fourier Transform method (503) to estimate a spectral content used to determine the knock variable. Then, a knock indication is provided (509) when the knock variable exceeds a magnitude of a predetermined threshold (507). Other embodiments include provision for providing a knock indication when a knock variable (703) derived from magnitudes of individual spectral components corresponding to characteristic knock spectra associated with acquired spectral energy exceeds a magnitude of a trended time weighted version of the knock variable by a predetermined magnitude (709).

대표청구항 ▼

1. A method of knock detection comprising the steps of:acquiring spectral energy associated with vibration caused by a knocking condition sensed from a running engine; providing a knock variable derived from magnitudes of individual spectral components corresponding to characteristic knock spectra a

1. A method of knock detection comprising the steps of:acquiring spectral energy associated with vibration caused by a knocking condition sensed from a running engine; providing a knock variable derived from magnitudes of individual spectral components corresponding to characteristic knock spectra associated with said acquired spectral energy; and providing a knock indication when said knock variable exceeds a magnitude of a trended time weighted version of said knock variable by a predetermined magnitude.