Methods and apparatuses for combustion diagnosis and control of internal combustion engines using accelerometers

摘要

Methods and systems for diagnosis and control of an internal combustion engine using vibration data obtained from a vibration sensor, eg an accelerometer mounted on the engine, includes filtering vibration data within a predetermined engine combustion time period, where the vibration data is indicative of a vibration of an internal combustion engine, determining a peak cylinder pressure (PCP) of a combustion cycle of the internal combustion engine based on the filtered vibration data, determining a location of peak cylinder pressure (LPP) of the combustion cycle of the internal combustion engine based on the filtered vibration data, where the PCP and the LPP are indicative of a performance characteristic of the combustion cycle, and modifying an ignition timing of the internal combustion engine based on the determined PCP and LPP eg to prevent partial fire, misfire or over-pressure. The combustion time period may include a range of crank angle from about -100 degrees to about 100 degrees. The vibration data may include voltage signals.