SYSTEM AND METHOD FOR ANALYZING CARBON BUILD UP IN AN ENGINE
First Claim
1. A method of identifying cyclic variations in combustion efficiency in cylinders of an internal combustion engine with aid of instrumentation, the engine including an air induction system, the cylinders, means for generating an ignition event for each of the cylinders, and an exhaust system, the instrumentation including one or more microprocessors programmed with one or more software routines, memory, and means for measuring cylinder pressure pulses;
- the method including;
running the engine through a number of combustion cycles;
measuring the pressure pulses with the means for measuring cylinder pressure pulses;
generating a waveform from the measured cylinder pressure pulses;
dividing the waveform of the measured cylinder pressure pulses into waveform cycles and cycle segments, wherein each waveform cycle represents a complete combustion cycle of the engine, wherein each cycle segment represents a combustion cycle of a separate cylinder of the engine, and wherein a total number of the cycle segments equals a total number of the cylinders;
marking each of the waveform segments from a cycle of the engine with a separate and distinct identifier, and repeating this identifier sequence for a number of successive cycles; and
comparing each individual waveform segment during a particular cycle with the waveform segment having the same identifier for a number of successive cycles to identify cycle to cycle variations for each waveform segment.
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Accused Products
Abstract
An induction cleaning analyzing system includes a pressure sensor, an ignition event detector, and a control module. The pressure sensor measures airflow pressures of intake air and/or exhaust from cylinders in a common airflow pathway of a vehicle. The ignition event detector determines ignition events of the cylinders. The control module obtains pressure waveforms representative of the airflow pressures and divides the pressure waveforms into waveform segments. The control module associates different subsets of the waveform segments with different ones of the cylinders using the ignition events. The control module also identifies cyclic variations in the airflow pressures flowing in the common airflow pathway and caused by at least one of the cylinders by examining the waveform segments associated with the at least one of the cylinders.
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Citations
20 Claims
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1. A method of identifying cyclic variations in combustion efficiency in cylinders of an internal combustion engine with aid of instrumentation, the engine including an air induction system, the cylinders, means for generating an ignition event for each of the cylinders, and an exhaust system, the instrumentation including one or more microprocessors programmed with one or more software routines, memory, and means for measuring cylinder pressure pulses;
- the method including;
running the engine through a number of combustion cycles; measuring the pressure pulses with the means for measuring cylinder pressure pulses; generating a waveform from the measured cylinder pressure pulses; dividing the waveform of the measured cylinder pressure pulses into waveform cycles and cycle segments, wherein each waveform cycle represents a complete combustion cycle of the engine, wherein each cycle segment represents a combustion cycle of a separate cylinder of the engine, and wherein a total number of the cycle segments equals a total number of the cylinders; marking each of the waveform segments from a cycle of the engine with a separate and distinct identifier, and repeating this identifier sequence for a number of successive cycles; and comparing each individual waveform segment during a particular cycle with the waveform segment having the same identifier for a number of successive cycles to identify cycle to cycle variations for each waveform segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- the method including;
Specification