Method and apparatus for fuel control of an internal combustion engine during cold-starting

US4239022A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ulrich Drews · Schwieberdingen, DE
• Michael Horbelt · Schwieberdingen, DE
• Hans Schnurle · Walheim, DE
• Peter Werner · Wiernsheim, DE
• Otto Glockler · Renningen, DE
• Dieter Gunther · Steinheim an der Murr, DE
• Richard Bertsch · Asperg, DE

Key dates

• Filing date: May 1, 1978
• Grant date: Dec 16, 1980
• Expiry date: May 1, 1998

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/061
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The cyclic control pulses for actuating the fuel injection valves of an internal combustion engine are extended during engine starting at low temperatures. The degree of pulse extension, i.e. of fuel enrichment, is made dependent on engine temperature and decreases as a function of cranking time. In addition, a repeated starting attempt will be accompanied by reduced pulse extension to prevent excessive enrichment of the mixture. The pulse extension may also be retained for a period of time after engine cranking to insure smooth running.