Patent · US Expired

Method for determining the activation voltage of a piezoelectric actuator of an injector

US7456545B2 · kind B2 · utility

5Cited by

1References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Andreas Huber · Holzgerlingen, DE
Kai Sutter · Stuttgart, DE
Marco Gangi · Eßlingen, DE
Jens Bloemker · Stuttgart, DE

Key dates

Filing date	Jul 10, 2004
Grant date	Nov 25, 2008
Priority date	—
Expiry date	Oct 17, 2024

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D41/2467
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A method for determining the activation voltage of a piezoelectric actuator of at least one injector which is used to inject a liquid volume under high pressure into a cavity, in particular into a combustion chamber of an internal combustion engine, the activation voltage being varied as a function of the pressure used to pressurize the liquid volume. A drift of the activation voltage (voltage requirement) required for a predefined lift of a control valve of the injector is controlled on an injector-specific basis by controlling the difference between the cutoff-voltage threshold and the final steady-state voltage to a setpoint value predefined for one operating point.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.