Internal combustion engine misfire detection with engine acceleration and deceleration correction during a repetitive misfire condition
US6023651A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1997 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Oct 17, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/1015
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To accurately detect patterns of misfires in an internal combustion engine, misfire is detected by calculating angular speed variation responsive to crankshaft rotation and comparing that with a predetermined misfire reference value. The calculated angular speed variation includes a first elementary term showing rotational variation of two different cylinders and a second correction term showing the rotational variation of the same cylinder separated by one combustion cycle. The elementary term shows how much rotational variation is between the cylinder n and the previous cylinder n-1 due to the occurrence of misfire. In contrast, the correction term shows how much error in the rotational variation is caused in same cylinder (e.g., mainly when accelerating or decelerating).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.