Malfunction test procedure and apparatus for idling control

US5031595A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus Heck · Hohenacker, DE
• Manfred Mezger · Markgröningen, DE
• Gunther Plapp · Echterdingen, DE
• Rudiger Jautelat · Tamm, DE
• Stefan Huwig · Tamm, DE

Key dates

• Filing date: Mar 20, 1990
• Grant date: Jul 16, 1991
• Expiry date: Mar 20, 2010

Classification

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

Abstract

In a method for the malfunction testing of an idling control arrangement for an internal combustion engine, the closing function of the idling contact is checked. As soon as it is established that the contact should really be closed but that this is not the case, it is certain that there is either an interruption in the idling contact circuit or a servomotor fault. In order to be able to distinguish which of these faults is present, a test movement sequence is carried out in which the servomotor of the arrangement is activated and a check is made whether the throttle flap angle changes. If this is not the case, the servomotor is defective; otherwise, an interruption in the idling contact circuit is present. Using this method, it is for the first time possible to detect interruption and servomotor faults. Until now, it was only possible to detect short-circuit faults. Such short-circuit faults can also be detected using a method according to the invention, and in particular with greater reliability than so far, since a smaller angle is used in the test condition than unit now.