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:
May. 16, 2000
Filed:
Jan. 21, 1998
Ulrich Staufenberg, Diethardt, DE;
Mannesmann VDO AG, Frankfurt, DE;
Abstract
A method of controlling the fuel/air ratio of an internal combustion engine in which the output signal of a first lambda probe which is arranged in the exhaust gas passage in front of a catalytic converter of the internal combustion engine is fed to a controller which has a proportional-and-integral (PI) characteristic. The controller gives off a setting variable for the fuel/air ratio. A further signal which is obtained from the output signal of a second lambda probe arranged behind the catalytic converter is fed to the controller and acts on the control circuit of the first lambda probe. In order to permit an accurate, adaptable control, the proportional portion of the output signal of the control circuit of the first lambda probe is modified as a function of the output signal of the second lambda probe.