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:
Mar. 13, 1990
Filed:
Nov. 14, 1988
Applicant:
Inventor:
Klaus Krieger, Affalterbach, DE;
Assignee:
Robert Bosch GmbH, Stuttgart, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02M / ; F02D / ; F02D / ;
U.S. Cl.
CPC ...
123569 ;
Abstract
An exhaust-gas recirculating system for internal-combustion engines includes a fuel-injection system which generates a hydraulic back pressure during control of the load- and speed-dependent variation of the beginning of delivery within a given set of load and speed characteristics. An hydraulic back pressure is used directly to control a pneumatic directional valve by means of an hydraulic servomotor. This directional valve, in turn, controls a vacuum-operated exhaust-gas recirculation valve. The hydraulic back pressure is also controlled by means of a pressure-holding valve and a constricting throttle.