Control system for an extrinsic-ignition internal combustion engine responsive to an engine load signal provided to dual control units

US4762105A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Hans-Ernst Beyer · Sachsenheim, DE
• Jorg Bonitz · Mühlacker, DE
• Robert Entenmann · Memmingen, DE
• Siegmar Forster · Schwieberdingen, DE
• Rochus Knab · Kornwestheim, DE
• Walter Kunzel · Ludwigsburg, DE
• Wolfgang Kugler · Karrösten, AT
• Alfred Mahlberg · Freiberg, DE
• Bernhard Miller · Weil der Stadt, DE
• Matthias Philipp · Stuttgart, DE
• Siegfried Rohde · Schwieberdingen, DE
• Stefan Unland · Schwieberdingen, DE
• Walter Viess · Schwieberdingen, DE
• Herbert Winter · Stuttgart, DE
• Jurgen Zimmermann · Salzgitter, DE

Key dates

• Filing date: Apr 10, 1986
• Grant date: Aug 9, 1988
• Expiry date: Apr 10, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B1/04
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A first control unit of a multiple function control system for a motor vehicle engine controls a function, such as fuel injection, for which it is desirable to provide an engine load signal measured by the amount of air drawn or forced into the engine per unit of time, determined by what is generally known as an air quantity meter. A second control unit of the control system controls the timing of an electrical ignition system for which it has been conventional to supply an engine load signal derived from a pressure transducer. In order to dispense with the pressure transducer and to make both control units subject to adaptive correction of the air quantity signal, the output of the air quantity meter is furnished to the second control system for modification therein by the computation facilities normally included in modern ignition control systems so as to shift or expand the range of engine load signals obtained from the air quantity meter to provide the same degree of resolution as would be available from a pressure transducer. For adaptive correction, the engine-load-to-engine-speed characteristic at a predetermined position of the throttle valve at or near full load is stored,…