Apparatus for determining engine abnormality
US5559706A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1994 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Jul 18, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1495
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system, capable of determining an engine abnormality, is disclosed. The engine includes a first regulator for controlling air fuel ratio and a second regulator for controlling the purging amount of fuel vapor into an air-intake passage from a fuel tank. The variance in the purging amount effects the air fuel ratio. An engine control unit computes a parameter value used to control the air fuel ratio based on a signal from a detector which detects the operational condition of the engine, and controls the first regulator with the computed parameter value to allow the operational condition of the engine to approach a requested condition. A determining apparatus determines that an abnormality has occurred in the engine when the parameter value computed by the control unit continuously deviates from a predetermined numerical range for a predetermined period of time. The determining apparatus also automatically adjusts the numerical range in accordance with a degree of influence of the variance in the purging amount on the air fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.