초록 ▼

A sensor signal from a sensor which measures vibration of an internal combustion engine is filtered by a filter to provide characteristic frequency components for a normal combustion. When the filter signal remains below a reference value, a fault signal is output to indicate a faulty combustion. Th

A sensor signal from a sensor which measures vibration of an internal combustion engine is filtered by a filter to provide characteristic frequency components for a normal combustion. When the filter signal remains below a reference value, a fault signal is output to indicate a faulty combustion. The filter may be switchable band-pass filters whose output signals are measured for knocking of the motor or for normal combustion. A programmed control unit evaluates the output signals from the filter within a characteristic time segment.

대표청구항 ▼

A method for recognizing the difference between a faulty combustion condition and a normal combustion condition for any particular internal combustion engine wherein said faulty combustion condition comprises one of lack of combustion, incomplete combustion, combustion occurring outside a time frame

A method for recognizing the difference between a faulty combustion condition and a normal combustion condition for any particular internal combustion engine wherein said faulty combustion condition comprises one of lack of combustion, incomplete combustion, combustion occurring outside a time frame intended for combustion for any preselected engine operating condition, and said normal combustion comprises lack of any of the aforementioned conditions, said method comprising: sensing a frequency of vibration of the internal combustion engine using a sensor designed to output a sensor signal having spectrum components which are typical for a particular engine operating in said normal combustion condition; passing said sensor signal through a bandpass filter which passes said typical spectrum components; rectifying any signal portions passing through said bandpass filter to produce a rectified signal; integrating said rectified signal during a period of time wherein the commencement of normal combustion occurs and ending said integration prior to a time during which knock may occur to produce an integrated signal; comparing said integrated signal to a predetermined reference value for said particular engine; and outputting a fault signal when said integrated signal remains below said predetermined reference value.