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:
Feb. 14, 1995
Filed:
May. 17, 1993
Gerhard Hoetzel, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
An electrochemical measuring sensor for the determination of the air/fuel ratio in exhaust gases of internal combustion engines both in the low-fuel and also in the fuel-rich range with a sensor element with an electrochemical oxygen concentration cell and an oxygen pumping cell with solid electrolyte base is proposed, in which the sensor element is arranged in a housing, capable of insertion in the exhaust gas pipe, in a manner such that the electrodes of the electrochemical oxygen concentration cell and of the oxygen pumping cell of the sensor element in the measuring sensor are situated outside the exhaust gas pipe, the communication with the atmosphere taking place via openings in the housing and the communication with the exhaust gas taking place via a diffusion slit. The sensor element is characterized by a particularly simple construction, free oxygen being available to the oxygen pumping cell both in the lean and also in the rich lambda range. The electrodes of the oxygen pumping cell can be of large dimension, for which reason only comparatively small current densities are necessary. A severe cooling of the sensor element in the electrode range due to cold exhaust gas (test gas) is prevented.