Knock control system for internal combustion engines
US4699106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1986 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Apr 17, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A knock control system for an internal combustion engine has a knock discrimination level. If an output signal from a knock sensor is higher than the knock discrimination level, then the knock control system determines that the engine is subjected to knock and retards the ignition timing. If the knock sensor output signal is lower than the knock discrimination level, i.e., if no knock or detonation is detected over a prescribed period of time, then the ignition timing is advanced. At least two corrective levels are established for comparison with a knock discrimination level, and occurrences in which the maximum value of the output signal from the knock sensor exceeds the corrective levels. The knock discrimination level is automatically corrected dependent on the counts of such occurrences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.