Process and device for influencing the air feed in an internal-combustion engine, in particular during idling and coasting

US5060611A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Krampe · Renningen, DE
• Gunter Braun · Freiberg, DE
• Helmut Janetzke · Hemmingen, DE

Key dates

• Filing date: Oct 1, 1990
• Grant date: Oct 29, 1991
• Expiry date: Oct 1, 2010

Classification

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

Abstract

A process and a device for air proportioning during idling or overrun mode of operation in an internal-combustion engine are provided. During idling, the internal-combustion engine is regulated to a nominal speed by means of a PI controller (203, 204) and a preliminary air rate control value is determined as a function of temperature, gear position and air-conditioning state of the vehicle. At the same time, the actual air mass or air intake rate (60) is measured and the difference value of the actual air intake rate and the preliminary air-rate control value is stored in a store (304). During overrun, the air-mass throughput of the internal-combustion engine is regulated to this stored value. Furthermore, the control receives a series of auxiliary variables which make it easier to carry out the control as a function of the particular operating mode.