Method and device for detecting autoignitions on the basis of measured and estimated internal cylinder pressure values of an internal combustion engine
US10508639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2013 |
| Grant date | Dec 17, 2019 |
| Priority date | — |
| Expiry date | Mar 5, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method is provided for detecting autoignition in a spark-ignited internal combustion engine, wherein values for the combustion chamber pressure are measured during a compression stroke of the internal combustion engine at defined crankshaft angles within an evaluation window, a filtered pressure value is determined from the measured values for the combustion chamber pressure, and theoretical pressure values in the combustion chamber that would arise if no combustion took place in the combustion chamber are determined for the defined crankshaft angles. The value of the slope between two defined crankshaft angles for filtered pressure values is determined, the value of the slope between two defined crankshaft angles for theoretical pressure values is determined, and a difference of the slope values is calculated therefrom. This difference is compared with a specified threshold value, and, if the threshold value is exceeded, an autoignition in the combustion chamber is inferred.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.