Apparatus for detecting malfunction in cyclically repetitive processes in an internal combustion engine

US4444048A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Nitschke · Ditzingen, DE
• Alfred Schulz · Oberriexingen, DE
• Klaus Glockler · Asperg, DE
• Heinrich Baumann · Schwieberdingen, DE
• Peter Dilger · Schwanau, DE
• Wilfried Venzke · Asperg, DE

Key dates

• Filing date: Sep 24, 1982
• Grant date: Apr 24, 1984
• Expiry date: Sep 24, 2002

Classification

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

Abstract

Repetitive processes in internal combustion engines which are dependent upon the values of particular parameters are controlled either by a main computer or an auxiliary computer. Switching from the main to the auxiliary computer takes place if a sequence error detecting stage detects errors in the desired alternation between the main control signals furnished by the main computer and reference mark signals indicative of predetermined angular positions of a shaft of the engine. Specifically, the system is switched to operate under control of the auxiliary computer if such an alternation error occurs again within a predetermined number of cycles. The switching can also take place as a result of missing reference mark signals and as a result of the absence of monitoring signals indicative of correct operation of the main computer program.