Device for crankshaft-synchronous detection of a periodically changing variable

US5520043A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ulrich Koelle · Schwieberdingen, DE
• Andreas Lock · Reutlingen, DE
• Andreas Roth · Karlsruhe, DE

Key dates

• Filing date: Feb 27, 1995
• Grant date: May 28, 1996
• Expiry date: Feb 27, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/187
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A device is disclosed for crankshaft-synchronous detection of a periodically changing variable of an internal combustion engine, for example the load, which is measured by a sensor whose output signal which is preprocessed or filtered in a suitable fashion is sensed with a selectable timing pattern. The start of sampling is resynchronized for each segment, the signal of a CA sensor being used for synchronization, the said CA sensor sensing a disc connected to the crankshaft and outputting one signal edge per segment. The combination for crankshaft-synchronous sampling with constant timing with respect to the segment permits the use of different load detection sensors with improved accuracy in comparison with previously used methods. The average value of the load for each segment can be determined from the sampled measured values and the quantity of air inducted per power cycle can also be determined.