Method for operating a common-rail system of a motor vehicle having a redundant common-rail-pressure sensor

US9863358B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bernd-Dietmar Becker · Berlin, DE
• Rene Zieher · Edingen-Neckarhausen, DE
• Andreas Sommerer · Weingarten, DE
• Kai Wipplinger · Eßlingen, DE
• Guenter Veit · Plochingen, DE

Key dates

• Filing date: Mar 12, 2014
• Grant date: Jan 9, 2018
• Expiry date: Sep 14, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D3/08
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for operating a common-rail system of a motor vehicle that includes a common-rail-pressure sensor configuration having at least two signal paths, and that can be operated at a maximally permissible common-rail pressure and at a minimally permissible common-rail pressure. Sensor signals are read out in each case in response to a pressure measurement in a common rail of the common-rail system via the at least two signal paths, and a signal deviation value is ascertained that characterizes a deviation between the pressure values that are each determined on the basis of the sensor signals. The method includes reducing the maximally permissible common-rail pressure by a correction value to a maximally permissible emergency common-rail pressure and/or increasing the minimally permissible common-rail pressure by a correction value to a minimally permissible emergency common-rail pressure in response to the signal deviation value exceeding a predefined value.