Method for determining the valve opening moment in piezo servo-driven injectors
US9856813B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2014 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Oct 30, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0618
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for determining the opening for piezo servo-driven injectors may include measuring a voltage and a charge at an end of a charging process of the piezo actuator; determining a provisional scaling factor by calculating Q/U; determining the maximum of CVORL and using the instant at which the maximum occurs as an approximation value of the valve opening instant; measuring the charge and voltage at the approximation of the valve opening instant; solving the equation:1.25×F2/E×C=(U×C−Q)2 Where F=force acting on the piezo actuator, E=electrical parameter of the piezo actuator; determining a new scaling factor from the solution of the equation; calculating the difference (U×C−Q) and determining a maximum of said value; and using the instant at which said maximum occurs as valve opening instant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.