Device for the recognition of a defective signal

US6329807A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ernst Wild · Oberriexingen, DE
• Manfred Pfitz · Leinfelden, DE

Key dates

• Filing date: Feb 12, 1999
• Grant date: Dec 11, 2001
• Expiry date: Feb 12, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The device for detecting an erroneous signal characteristic of a load on an internal combustion engine that includes first and second differentiators (10,16) with delay devices that generate corresponding output signals (S11, S22) from respective load signals (S1,S2); first and second magnitude-forming devices (14,17) connected with the first and second differentiators respectively to generate respective magnitude signals from the corresponding output signals (S11,S22) first and second low-pass filters (15, 18) connected with the first and second magnitude-forming devices respectively to generate first and second DC voltage signals (MW1,MW2); a subtracting device (19) for subtracting the first and second DC voltage signals (MW1,MW2) from each other to generate a difference signal (D); and comparison devices (20,23) for generating a first error signal or a second error signal when the difference signal (D) is greater than a predetermined threshold (SW1) or less than a negative of the predetermined threshold (-SW1) respectively, so that the first error signal indicates the main load signal is faulty and the second error signal indicates the auxiliary load signal is faulty.