Diagnostic method and arrangement for quantitatively checking actuators in internal combustion engines

US4794790A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Florin Margarit-Metaxa · Hamburg, DE
• Helmut Denz · Stuttgart, DE

Key dates

• Filing date: Jul 17, 1987
• Grant date: Jan 3, 1989
• Expiry date: Jul 17, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A diagnostic method and arrangement quantitatively checks actuators during the open-loop and/or closed-loop control of operational parameters of an internal combustion engine. The method and arrangement checks the idle actuator and the tank venting value well as the associated hardward chains, that increased or decreased quantities of air (.+-..DELTA.Q.sub.TEV/LLR) be supplied via an appropriate controlling to the tank-venting valve or of the idle regulator, preferbly simultaneously and in opposite directions and that the resulting possible changes of rotational speed (rotational speed remains constant; rotational speed decreases; rotational speed increases) be determined and appropriately evaluated.