System for diagnosing and controlling high-pressure fuel system for in-cylinder fuel injection engine
US6138638A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Sep 1, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0602
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system for controlling an in-cylinder fuel injection engine determines that a high-pressure fuel system is abnormal, when meeting at least one of conditions that the fuel pressure Pf of the high-pressure fuel system does not reach a preset pressure PFS (S24) even if a predetermined period of time elapses after the engine start-up (S22), that the fuel pressure Pf of the high-pressure fuel system is not within an ordinary fuel pressure range defined by the lower limit PFL and the upper limit PFH after the engine start-up (S27, S28), and that the fuel injection pulse width Ti continues to exceed the upper limit TiNGMAX, which can not usually be obtained, for a predetermined period of time at a lean air-fuel ratio (S30.about.S33). Thus, the abnormality of the high-pressure fuel system of the in-cylinder fuel injection engine can be accurately diagnosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.