초록 ▼

An adaptive knock control for a spark ignited, internal combustion engine is disclosed in which a signal indicating sensed knock induced and other bursts of engine vibrations is passed through a bandpass filter effective to tune the apparatus to a characteristic knock frequency which is variable wit

An adaptive knock control for a spark ignited, internal combustion engine is disclosed in which a signal indicating sensed knock induced and other bursts of engine vibrations is passed through a bandpass filter effective to tune the apparatus to a characteristic knock frequency which is variable with engine speed. The filter tuned frequency may be varied directly with engine speed to follow the characteristic knock frequency. Additionally or alternatively, it may be varied, at a particular engine speed, in a first direction away from the knock frequency avoid a strong engine noise component in the opposite direction from the knock frequency.

대표청구항 ▼

An adaptive knock control for a spark ignited, internal combustion engine of the type in which knock induced and other bursts of engine vibrations occur, the adaptive knock control comprising, in combination: sensing means responsive to the knock induced and other bursts of engine vibrations to gene

An adaptive knock control for a spark ignited, internal combustion engine of the type in which knock induced and other bursts of engine vibrations occur, the adaptive knock control comprising, in combination: sensing means responsive to the knock induced and other bursts of engine vibrations to generate an electric signal thereof; bandpass filter means effective to discriminate in the signal between those vibrations occurring at a characteristic knock frequency and those at higher or lower frequencies, the bandpass filter means having a tuned frequency variable in response to a tuning control signal; means effective to vary the tuning control signal and thus the frequency of the bandpass filter means in response to engine speed; and means to further process the output of the bandpass filter means, generate therefrom a knock control signal and control engine spark timing thereby to control knock to a predetermined level.