Diagnostic systems and methods for variable lift mechanisms of engine systems having a camshaft driven fuel pump
US7921701B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2009 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Aug 8, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/221
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A lift mechanism diagnostic system comprises a fuel pump disabling module, a pressure module, and a diagnostic module. The fuel pump disabling module selectively disables a fuel pump that is driven by a camshaft. The pressure module determines a first pressure of fluid provided to a variable valve lift mechanism when the variable valve lift mechanism is operated in a first lift mode while the fuel pump is disabled and determines a second pressure of the fluid when the variable valve lift mechanism is operated in a second lift mode while the fuel pump is disabled. The diagnostic module selectively diagnoses a fault in the variable valve lift mechanism based on the first and second pressures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.