Trigger circuit with self-adjusting reference value

US5116342A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Schmidt
• Werner Fischer · Heimsheim, DE
• Johannes Locher · Stuttgart, DE

Key dates

• Filing date: Dec 31, 1990
• Grant date: May 26, 1992
• Expiry date: Dec 31, 2010

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B3/06
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a trigger circuit which compares amplitudes of the signal waveform of a periodic signal to reference values dependent upon the previous signal waveform of this signal. A trigger signal is emitted when the particular reference value is reached. The trigger circuit includes a memory for the particular reference value. The reference value is determined from a portion of the period of the signal to determine a precise triggering point.