The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1991
Filed:
Sep. 05, 1990
Josef Wahl, Stuttgart, DE;
Alf Loffler, Markgroningen-Talhausen, DE;
Hermann Grieshaber, Aichtal-Aich, DE;
Wilhelm Polach, Moglingen, DE;
Ewald Eblen, Stuttgart, DE;
Joachim Tauscher, Stuttgart, DE;
Helmut Laufer, Gerlingen, DE;
Ulrich Flaig, Markgroningen, DE;
Johannes Locher, Stuttgart, DE;
Manfred Birk, Oberriexingen, DE;
Gerhard Engel, Stuttgart, DE;
Alfred Schmitt, Ditzingen, DE;
Pierre Lauvin, Francheville, DE;
Fridolin Piwonka, Markgroningen, DE;
Anton Karle, VS-Villingen, DE;
Hermann Kull, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention is directed to a method and an arrangement for controlling the fuel injection in a high-pressure fuel pump. Magnetic valves determine the fuel quantity to be injected into the engine. The magnetic valve is controlled during the pumping phase of the pumping element in such a manner that first a preinjection and then a main injection is carried out. In specific operating conditions, the control apparatus determines the duration of the drive pulses for the magnetic valve at which a preinjection just takes place. With the duration of the drive pulses as a basis, the control apparatus forms compensating signals for the drive pulses which effect preinjection and stores the same.