Method of and device for operating a vacuum accumulator of an internal combustion engine, provided for servo function

US6349699B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ernst Wild · Oberriexingen, DE
• Wolfgang Wagner · Preetz, DE
• Gerard Melchior · Schwieberdingen, DE
• Klaus Ries-Mueller · Bad Rappenau, DE
• Matthias Kuesell · Kornwestheim, DE

Key dates

• Filing date: Feb 22, 2000
• Grant date: Feb 26, 2002
• Expiry date: Feb 22, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T17/02
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method of operating an internal combustion engine of a motor vehicle provided with a vacuum accumulator which provides an auxiliary energy required for at least one servo function of the internal combustion engine in form of a vacuum and which is acted upon by a vacuum acting in a suction pipe of the internal combustion engine. The method computes a pressure acting in the vacuum accumulator, supplies mass flows to the vacuum accumulator when at least one servo function is performed, and withdraws the mass flows from the vacuum accumulator when a pressure acting in the suction pipe is smaller than the pressure acting in the vacuum accumulator. The pressure acting in the vacuum accumulator is computed from a mass balance of the mass flows supplied to the vacuum accumulator and withdrawn from the vacuum accumulator.