Solid-State Electrochemical Sensors for Automotive Applications.

Mukundan, R. ; Brosha, E. ; Garzon, F.

Technical Information Center Oak Ridge Tennessee

关键词: Automobiles;    On-line measurement systems;    Electrochemical cells;    Design;   

RP-ID  :  DE2001776950

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Several types of electrochemical sensors have been studied for application in an automobile. The most prevalent amongst these is the zirconia oxygen sensor, which is also known as the (lambda)-sensor or Exhaust Gas Oxygen (EGO) sensor. This sensor is used to monitor the oxygen partial pressure in the exhaust, which in turn is utilized to control the air/fuel ratio to the engine. Currently, two such oxygen sensors are being used to determine the 'state-of-health' of the catalyst. One sensor is placed upstream of the catalyst and another downstream, and the catalyst efficiency is indirectly monitored by measuring its' oxygen storage capacity. However such a system has several disadvantages and works only when the engine is operated around stoichiometry.