Apparatus for regulating the idling rpm of an internal combustion engine

US4425887A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Heinrich Knapp · Leonberg, DE
• Rainer Schillinger · Glückstadt, DE

Key dates

• Filing date: Mar 30, 1982
• Grant date: Jan 17, 1984
• Expiry date: Mar 30, 2002

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D43/00
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An apparatus is proposed which serves to regulate the idling rpm of an internal combustion engine. To this end, a bypass valve is provided, which is disposed in a bypass around a throttle valve in the intake tube of the engine. A movable wall of the bypass valve separates a control chamber from a bypass chamber. The intake tube pressure downstream of the throttle valve in the bypass chamber prevails. The control chamber communicates via a control throttle restriction with atmospheric pressure and also, via an electromagnetically actuatable control valve which operates in accordance with operating characteristics of the engine, as well as with the intake tube pressure downstream of the throttle valve. The regulation of the idling rpm is thus effected by means of a proportional component effected by the bypass valve and an integral component effected by the pressure distribution between the control throttle restriction and the control valve. A pilot valve or magnetic pilot valve, by effecting a brief opening of the bypass valve, serves to prevent the loaded engine from stalling in the event of an abrupt closure of the throttle valve.