Method and code for determining event-based control delay of hydraulically-deactivatable valve train component
US7025035B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2005 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Feb 24, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2800/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for determining an event-based hydraulic control delay in a multi-displacement system for an internal combustion engine, with which to adjust the triggering a solenoid in hydraulic communication with a hydraulically-deactivatable valve train component, includes retrieving either a first mapped value representative of a time-based hydraulic deactivation delay, or a second mapped value representative of a time-based hydraulic reactivation delay, based on a current engine speed and a current oil temperature, preferably using different lookup tables for each of the first and second mapped values. The method further includes determining a current time period between generated crankshaft position pulses, and dividing either the first value or the second by the first time period to obtain either an event-based hydraulic deactivation delay or an event-based hydraulic reactivation delay. The event-based delays are thereafter used to synchronize the timing of solenoid operation when deactivating or reactivating given engine cylinders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.