Misfire detector using linear detection of crankshaft angular speed
US7197916B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2005 |
| Grant date | Apr 3, 2007 |
| Priority date | — |
| Expiry date | Apr 4, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A misfire detector detects a misfire in a cylinder based on a maximum value and the minimum value of the angular speed. A first crank angle range is defined in such a manner as to include a crank angle in which the angular speed is maximum during a power stroke. A second crank angle range is defined in such a manner as to include a crank angle in which the angular speed is minimum during the power stroke. The maximum value of the angular speed is calculated within the first crank angle range, and the minimum value of the angular speed is calculated within the second crank angle range. The calculated maximum and minimum values are brought close to actual values to enhance a reliability of the misfire detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.