Safety arrangement for an internal combustion engine

US4515125A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rainer Buck · Opfingen, DE
• Hermann Kull · Stuttgart, DE
• Fridolin Piwonka · Asperg, DE
• Albrecht Sieber · Möhrendorf, DE
• Gerhard Stumpp · Stuttgart, DE
• Wolf Wessel · Oberriexingen, DE

Key dates

• Filing date: Jan 17, 1984
• Grant date: May 7, 1985
• Expiry date: Jan 17, 2004

Classification

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

Abstract

The invention is directed to a safety arrangement for an internal combustion engine having self-ignition where, in the sense of an overall system monitoring, specific signals relating to the operating conditions of the internal combustion engine are continuously monitored. These signals are indicative, for example, of the position of the throttle pedal, the computed rack-travel nominal or desired value, and the rotational speed. The monitored signals are processed and a corrected rack-travel nominal value is generated by means of a minimum-value selection circuit. The corrected rack-travel nominal value signal generated in this manner is fed to the rack controller of an EDC unit. At the same time, a deviation in rack travel is determined utilizing the corrected rack travel nominal value in combination with an actual-value signal of the rack travel fed back from the rack-travel sensor. The signal indicative of actual rack travel also serves for a comparison with the upper and lower limits of the rack-travel sensor voltage; and, depending on the error condition occurring, either the output stage of the rack controller is de-energized and/or the fuel-injection pump is simultaneously s…