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:
Apr. 08, 1986
Filed:
Jan. 31, 1985
Helmut Janetzke, Schwieberdingen, DE;
Helmut Kauff, Schwieberdingen, DE;
Alfred Schulz, Oberriexingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention is directed to a method and an apparatus of determining whether the rotational speed of an internal combustion engine is attributable to a corresponding correcting quantity signal from an idle air charge control or whether an overrun condition exists. For this purpose, a variable supplementary signal is superposed on the correcting quantity signal of the idle air charge control. The mean value of this supplementary signal may be preferably zero. Taking the dead time of the internal combustion engine into account, the measured rotational speeds are correlated with the changes in the previously issued correcting quantity signals, and it is determined whether the engine is in the overrun mode of operation or idling. If an overrun condition is detected, an overrun recognition signal may be issued to initiate measures aimed at preventing the internal combustion engine from stalling, for example.