Relative exhaust back-pressure of an internal combustion engine

G - Physics – 01 – M

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73/169, 354/24

G01M 15/00 (2006.01) G01M 15/10 (2006.01)

Patent

CA 1139591

-50- Relative Exhaust Back-Pressure of an Internal Combustion Engine Abstract The exhaust back-pressure of an internal combustion (IC) engine is used to provide an indication of the relative combustion efficiency of the engine's cylinders. The instantaneous values of back-pressure axe sensed at selected, sub-cyclic crankshaft angular intervals, within a full engine cycle, each angle interval being substan- tially less than that associated with a cylinder sub-cycle, each sensed value of back-pressure being identified by the sensed angle position to provide an indication of the sub-cyclic fluctuation in back-pressure as they occur at known cylinder exhaust stroke cycles within the engine cycle, thereby providing identification of each sub-cyclic back-pressure pulse as being associated with a particular engine cylinder, the relative magnitudes of the back- pressure pulses being compared with each other to provide indices of the relative combustion efficiency of each cylinder. H99?-TS

362900

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