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. 10, 2001
Filed:
Dec. 10, 1999
Armin Hassdenteufel, Unterriexingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention is directed to a method for checking the operability of a variable valve control in an internal combustion engine having an intake manifold and wherein the state of the variable valve control contributes to determining the combustion chamber charge. A first signal is provided and is indicative of the air mass actually drawn in by the engine via the intake manifold. A primary signal (HLS) for the combustion chamber charge is formed from the first signal. A second signal is formed from a desired value for the state of the variable valve control and at least one of the following: the position of a throttle flap, the pressure in the intake manifold and the rpm of the engine. An ancillary signal (NLS) for the combustion chamber charge is formed from the second signal. The primary and ancillary signals (HLS, NLS) are compared and an index is formed for the deviation of the primary and ancillary signals (HLS, NLS) from each other. A fault signal is outputted and/or stored when the index exceeds a predetermined value.