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:
Jul. 05, 1994
Filed:
Oct. 01, 1993
Helmut Laufer, Gerlingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A fuel injection apparatus for internal combustion engines comprising a pump work chamber defined in a bore of a housing by a pump piston. The pump work chamber is supplied with fuel and relieved via a fuel line containing a magnet control valve. Moreover, the pump work chamber communicates with an injection valve via a supply line. Controlling of the injection is done via the opening or closing of the magnet control valve during the pumping stroke of the pump piston; to that end, the magnet valve is triggered by a control unit. To enable performing an accurate injection, a needle stroke transducer is disposed on the nozzle needle of the injection valve; if a limit value is exceeded, its stroke motion is detected as a precise signal for the onset and end and hence the size of the injection quantity and is transmitted to the control unit, where this actual value is compared with a set-point value from a performance graph, and a correction of the magnet valve triggering is consequently done performed, if needed.