Method for ascertaining a setpoint value for a manipulated variable for activating a low-pressure pump

US10859023B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Joerg Kuempel · Stuttgart, DE
• Michael Bauer · Unterföhring, DE
• Alexander Schenck Zu Schweinsberg · Heubach, DE
• Klaus Joos · Walheim, DE

Key dates

• Filing date: Mar 8, 2017
• Grant date: Dec 8, 2020
• Expiry date: Mar 8, 2037

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2200/0606
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for ascertaining a setpoint value for a manipulated variable for activating a low-pressure pump in a fuel supply system for an internal combustion engine, including a high-pressure accumulator and a high-pressure pump including a volume control valve, the low-pressure pump being activated in such a way that a pressure provided by the low-pressure pump is reduced across multiple intake phases, in which fuel delivered by the low-pressure pump is sucked in by the high-pressure pump via the volume control valve, the volume control valve being at least temporarily held in a closed position during each of the multiple intake phases, in which it may be opened from a side facing the low-pressure pump, and the setpoint value being ascertained, taking into account an activating value of the manipulated variable, in which a drop in the delivery rate of the high-pressure pump is detected.