Apparatus for controlling an internal combustion engine
US5115778A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1991 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Feb 5, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for controlling an internal combustion engine comprises a transducer which detects acoustic emissions generated by the operation of the engine, and produces an output signal. The output signal is amplified, rectified and enveloped to produce an electrical signal. The electrical signal has its direct current component removed to leave the alternating current component of the electrical signal. The AC component of the electrical signal is rectified by a rectifier and the mean level of the AC component of the electrical signal is measured by a measurer. An analyzer monitors the mean level of the AC component of the electrical signal and sends a feedback signal to an ignition timing device of the internal combustion engine. The analyzer sends feedback signals such that the mean value of the AC component of the electrical signal lies in the region of a positive peak prior to the occurrence of preignition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.