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. 26, 1988
Filed:
Oct. 09, 1987
Thomas Blumel, Schmitten, DE;
Bernhard Lukas, Raunheim, DE;
Wolfgang Reisch, Biebergemund-Bieber, DE;
Eberhard Mausner, Bad Soden, DE;
VDO Adolf Schindling AG, Frankfurt am Main, DE;
Abstract
In a method for detecting the readiness for operation of a oxygen measurement probe which is arranged in the exhaust duct of an internal combustion engine and serves together with a regulating device to regulate the preparation of the mixture for the internal combustion engine, the output voltage of the oxygen measurement probe is integrated with an integration time constant which is dependent on the internal resistance of the oxygen measurement probe. The rate of change of the output voltage is measured. Above a predetermined value of the rate of change, readiness for operation is noted. In a circuit arrangement for the carrying out of the method, there is connected to the output of the oxygen measurement probe the input of an integrator whose output is connected via an analog-to-digital converter to the input of a microcomputer. Also there can be fed to an integrator an initial value which lies in a central part of the operating range of the output voltage of the integrator.