Method, computer program, and control unit for operating a vacuum reservoir provided in an internal combustion engine

US6735942B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ernst Wild · Oberriexingen, DE
• Kristina Eberle · Markgröningen, DE
• Lutz Reuschenbach · Stuttgart, DE

Key dates

• Filing date: Aug 9, 2002
• Grant date: May 18, 2004
• Expiry date: Aug 9, 2022

Classification

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

Abstract

Described are a method, a computer program, and a control unit for operating a vacuum reservoir provided in an internal combustion engine of a motor vehicle for a servo booster or power-assist unit of the internal combustion engine, which is coupled to an intake manifold of the internal combustion engine and to an electrical suction pump. The pressure prevailing in the vacuum reservoir is determined by a computational model in which quantity flows are fed to the vacuum reservoir when at least one servo unit is actuated, quantity flows are removed from the vacuum reservoir when the pressure prevailing in the intake manifold is lower than the pressure prevailing in the vacuum reservoir, i.e., when the electrical suction pump is switched on. The total pressure prevailing in the vacuum reservoir is calculated from the balance of these flow quantities.