Relative exhaust back-pressure of an internal combustion engine
US4302814A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1979 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Dec 20, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/106
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.