Method and arrangement for diagnosing the open-loop control of the tank-venting valve in combination with the open-loop control of an internal combustion engine

US5243853A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ulrich Steinbrenner · Kohlhof, DE
• Helmut Denz · Stuttgart, DE
• Gunther Plapp · Echterdingen, DE
• Ulrich Mayer · Weißenhorn, DE
• Wolfgang Wagner · Preetz, DE
• Stephan Hohne · Bietigheim, DE

Key dates

• Filing date: Nov 4, 1991
• Grant date: Sep 14, 1993
• Expiry date: Nov 4, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M25/0809
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method is introduced of checking the drivability of a tank-venting valve (TEV) and of an idle actuator. After actuating the TEV, an additional air/fuel mixture is supplied to the intake region of an internal combustion engine having an air/fuel ratio which can be equal to that at which the engine usually operates (.lambda..sub.0) or greater or less than .lambda..sub.0. Reactions of a .lambda.-control and/or of an idle control can be evaluated in dependence thereon. It is advantageous that a check is made independently of how intense the additional air/fuel mixture is enriched with fuel.