Method and apparatus for controlling a fuel pump

US5267546A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Hans-Joachim Siebert · Schwieberdingen, DE
• Nestor Rodriguez-Amaya · Stuttgart, DE
• Joachim Tauscher · Stuttgart, DE
• Herbert Graf · Moers, DE
• Werner Zimmermann · Putzbrunn, DE
• Alfred Schmitt · Ditzingen, DE
• Pierre Lauvin · Francheville, FR
• Anton Karle · Villingen-Schwenningen, DE

Key dates

• Filing date: May 21, 1992
• Grant date: Dec 7, 1993
• Expiry date: May 21, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/0097
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method and apparatus for controlling the flow of fuel for a gasoline or diesel gasoline engine controls a solenoid valve for actuating the fuel pump. A pump piston is driven by the camshaft and, in turn, pressurizes the fuel for delivery to the individual cylinders. Based on the operation of the solenoid valve, the beginning of the injection of fuel and the end of the injection of fuel are established Based upon spaced angular markings on the camshaft, a control unit determines the trigger signals for actuating the solenoid valve. To calculate the trigger signals, the markings on the camshaft are counted and interpolated therebetween over time. The interpolation is based on the instantaneous rotational speed N of the camshaft, which is sensed immediately before performing the interpolation.