Apparatus for detecting misfire in internal combustion engines for vehicles
US5263453A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1991 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Oct 31, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for detecting a misfire in an internal combustion engine for a vehicle includes a rotational speed change quantity computing unit which detects a rotational speed of the engine and computes a change quantity of the rotational speed of the engine, a misfire determination value correction coefficient setting unit which detects a load on the engine and sets a correction coefficient of a misfire determination value based on a result of detection of the engine load, a misfire determination value setting unit for setting a misfire determination value based on the set misfire determination value correction coefficient, and a misfire determining unit for determining whether a misfire has occurred in the engine by comparing the change quantity of the rotational speed of the engine from the rotational speed change quantity computing unit with the misfire determination value from the misfire determination value setting unit. The misfire detecting apparatus further includes a misfire detection result invalidating unit for invalidating a result of misfire determination by the misfire determining unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.