Fuel mixture control system

US4205635A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dieter Kirn · Asperg, DE
• Ulrich Steinbrenner · Kohlhof, DE
• Hans Schnurle · Walheim, DE
• Peter Werner · Wiernsheim, DE
• Ulrich Drews · Schwieberdingen, DE
• Klaus Streit
• Erwin Gloss · Ditzingen, DE
• Helmut Moder · Stuttgart, DE

Key dates

• Filing date: Mar 24, 1977
• Grant date: Jun 3, 1980
• Expiry date: Mar 24, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/068
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel mixture control apparatus for an electronic fuel injection system for internal combustion engines. In a warm-up controller, the fuel injection control pulses are lengthened for enrichment of the fuel-air mixture during engine warm-up on the basis of signals supplied by a temperature transducer. In order to make the warm-up enrichment dependent on prevailing engine states, for example on the conditions of idling and partial or full load, circuitry is provided to sense these conditions and to suitably alter the enrichment factor. A further circuit suppresses the dependence or enrichment on engine status during engine starting. Various embodiments are presented.