Relative exhaust back-pressure of an internal combustion engine

Details Relative exhaust back-pressure of an internal combustion engine Relative exhaust back-pressure of an internal combustion engine

1979-12-20

1981-11-24

Krass, Errol A.

Boots, shoes, and leggings

73116, 364431, G01L 326

Patent

active

043028144

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 are sensed at selected, sub-cyclic crankshaft angular intervals, within a full engine cycle, each angle interval being substantially 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.

REFERENCES:
patent: 4050296 (1977-09-01), Benedict
patent: 4133205 (1979-01-01), Hulls et al.
patent: 4179922 (1979-12-01), Bouverie et al.
patent: 4194471 (1980-03-01), Baresel

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