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:
Jun. 12, 1990
Filed:
Mar. 17, 1989
Martin Zechnall, Schwieberdingen, DE;
Albrecht Clement, Kornwestheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention is directed to a method for controlling the lambda value of the air/fuel mixture supplied to an internal combustion engine. The method utilizes the signal of a lambda probe as the measurement of an actual value with this actual value displaying discontinuities during the transistion from the rich to the lean lambda region. The switch-over of the control direction in the direction 'rich' is undertaken when the actual value in the form of the probe voltage passes through the reference voltage; however, this only happens when the probe voltage had an previously climbed to a threshold value 'rich'. Correspondingly, the control direction is swiched over to the direction 'lean' only when the reference value is passed through and when the probe voltage previously had dropped to a threshold voltage 'lean'. The apparatus which operates pursusant to the method no longer leads to undefined control oscillations when cylinder scatter effects occur.