Relative manifold vacuum of an internal combustion engine
US4291382A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1979 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Dec 20, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.