Device for determining abnormality in engine system
US10054074B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 2015 |
| Grant date | Aug 21, 2018 |
| Priority date | — |
| Expiry date | Feb 16, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/1012
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An estimation unit calculates an estimated value of oxygen concentration in an exhaust passage on the basis of a target injection amount of a fuel injection valve and an air intake amount of an engine. A first determination unit determines the relationship of a detected value to the estimated value of the oxygen concentration, in both a fuel-injecting state and a non-fuel-injecting state. For each of a plurality of cylinders, a second determination unit acquires crankshaft angular acceleration during the expansion strokes of the cylinders in the fuel-injecting state, and determines the relationship of each angular acceleration to the average value of all of the angular accelerations. An abnormality determination unit determines whether or not there is an abnormality in an engine system on the basis of the determination results of the first and second determination units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.