Relative manifold vacuum of an internal combustion engine

Details Relative manifold vacuum of an internal combustion engine Relative manifold vacuum of an internal combustion engine

1979-12-20

1981-09-22

Gruber, Felix D.

Boots, shoes, and leggings

731172, 364558, G01L 2324, G06F 1520, G01M 1500

Patent

active

042913829

ABSTRACT:
The instantaneous values of intake manifold vacuum in an internal combustion (IC) engine running under load are measured to provide an indication of the relative performance and relative suction ability of each cylinder in the engine. The instantaneous values of manifold vacuum are sensed at selected, sub-cyclic crankshaft angle intervals within a full engine cycle, each angle interval being substantial less than that associated with a cylinder sub-cycle, each sensed value of manifold vacuum being identified by the sensed angle position to provide an indication of the sub-cyclic fluctuations in manifold vacuum as they occur at known cylinder intake strokes within the engine cycle, thereby providing identification of each sub-cyclic fluctuation in manifold vacuum as being associated with a particular cylinder, the relative magnitudes of the manifold vacuum fluctuations providing a relative indication of each cylinder's performance and suction ability within a common engine cycle.

REFERENCES:
patent: 3964301 (1976-06-01), Hanson et al.
patent: 4027532 (1977-06-01), Trussel et al.
patent: 4050296 (1977-09-01), Benedict
patent: 4064746 (1977-12-01), Mercik, Jr. et al.
patent: 4072047 (1978-02-01), Reismuller
patent: 4125894 (1978-11-01), Cashel et al.
patent: 4145746 (1979-03-01), Trussell et al.
patent: 4179922 (1979-12-01), Bouverie et al.

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