Apparatus for actuating an adjustment device acting upon a control apparatus for exhaust recirculation in internal combustion engines

US4300515A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Max Straubel · Stuttgart, DE
• Gerhard Stumpp · Stuttgart, DE
• Klaus Krieger · Marbach am Neckar, DE
• Wolf Wessel · Oberriexingen, DE

Key dates

• Filing date: Nov 20, 1979
• Grant date: Nov 17, 1981
• Expiry date: Nov 20, 1999

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M26/21
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An apparatus is proposed which serves the purpose of load-dependent actuation of an adjustment device, wherein the cross section and/or the pressure drop of an exhaust recirculation line in an internal combustion engine can be varied in accordance with load. An injection pump of conventional design is associated with the internal combustion engine and further includes a quantity adjustment device, the position of which acts as a control variable for the load. With this control variable, a booster apparatus is controlled via a comparison apparatus; the output variable of the booster apparatus in turn is the control variable for the actuation of an adjustment device which acts on an exhaust recirculation control apparatus. When a threshold value for load is exceeded, the exhaust recirculation is precluded. The control variable is preferably formed as a fuel pressure signal with the fuel withdrawn from the suction chamber of the injection pump. Apparatuses are proposed by means of which, in the event of the actuation of the control apparatus for exhaust recirculation, the smallest possible removal quantity of fuel is required for control purposes.