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Automotive applications, oxygen sensors

Meitzler, A. H. "Application of Exhaust-Gas-Oxygen Sensors to the Study of Storage Effects in Automotive Three-Way Catalysts" SAE Paper No. 800019, 1980. [Pg.77]

While this paper will concentrate on oxygen sensors as used in automotive applications, there is increasing interest in their use in the measurement and control of industrial and other furnaces in order to reduce fuel costs by maximizing the combustion efficiency. They have also been used for many years to measure the oxygen content of molten glass, of molten steel and other metals and for numerous other applications where a measurement of the oxygen partial pressure is desired. [Pg.251]

While a number of designs have been used, most oxygen sensors for automotive applications consist of a hollow, closed end tube, a schematic of which is shown in Figure 2. As shown, the interior of the closed end tube is open to the atmosphere which serves as a constant or reference oxygen partial pressure while the exterior is exposed to the exhaust gas. The voltage signal produced by the electrolyte is sensed by electrodes on the inner and outer surface of the sensor. These, in turn, are connected to the electronics package of the closed loop system. [Pg.252]

One other type of oxygen sensor has received considerable attention as an alternative to the galvanic type of sensor. This is the resistive type of sensor which uses a metal oxide whose resistance is dependent on the oxygen partial pressure (6). While a number of different oxides have been used, titanium oxide appears to have the best combination of properties for automotive applications (y. [Pg.264]

Oxygen sensors, in low volume use as part of a closed loop emission control system for automotive applications since 1977, have seen wide-spread use starting with the 1981 model year. At the present time, a partially stabilized zirconia electrolyte using yttrium oxide as the stabilizer appears to be the most common choice for this application. [Pg.264]

Logothetis, E.M. (1987) In Turner, D.R. (Ed.) Oxygen Sensors for Automotive Applications, in Chemical Sensors. Electrochemical Society, p. 142. [Pg.239]

Oxygen sensors are the most widely used solid electrolyte-based sensors [393-395], because the control of oxygen concentrations is critical to controlling the combustion process. For automotive applications, exhaust gas oxygen (EGO) sensors provide critical information for controlling the air-to-fuel ratio for internal combustion engines [396, 397]. Tlte use of an optimal air-to-fuel ratio leads to increased efficiency and reduced emissions. [Pg.463]

Oxygen sensors in automotive applications are used to measure the air fuel (A/F) ratio of engine exhaust gases and to control the optimum A/F ratio for perfect exhaust gas after-treatment by catalytic converters [1]. Therefore, they are also known as lambda or A/F ratio sensors. [Pg.480]

A typical example includes the yttria-stabilized-zirconia-based high-temperature potentiometric oxygen sensor which is widely used in automotive applications. Platinum thick films are applied, forming both the cathode and anode of the sensor. The thick electrode has a porous structure which provides a larger electrode surface area compared to non-porous structures. For current measurement, a porous electrode is desirable since it leads to a larger current output. If the metallic film serves as the electrocatalyst, a porous structure is also desirable, for it provides more catalytic active sites. On the other hand, electrodes formed by the thick-film technique do not have an exact, identical... [Pg.422]

Micromachined and microfabricated electrochemical sensors have been used either per se, or as part of a sensor system, in many practical applications. This includes various biosensors and chemical sensors reported in research literature. An example of a practical electrochemical sensor is the yttria-stabilized zirconium dioxide potentiometric oxygen sensor used for fuel-air control in the automotive industry. Thick-film metallization is used in the manufacture of this sensor. Even though the sensor is not microsize, this solid electrolyte oxygen sensor has proven to be reliable in a relatively hostile environment. It is reasonable to anticipate that a smaller sensor based on the same potentiometric or the voltammetric principle can be developed using advanced microfabrication and micromachining techniques. [Pg.429]

Many different types of sensors have also been fabricated by tape casting. One of the most widely used sensors is the oxygen sensor used in automotive and other applications. These sensors are based upon solid-state conductivity of the ceramic elements at elevated temperatures. Most are fabricated from stabilized zirconia, which is the electrolyte in the device. The zirconia is a solid ionic conductor that transforms oxygen partial pressure or activity gradients into an electrical signal, which can then be further processed to perform control activities such as carburation or ignition modification. The... [Pg.216]

Ceramic sensors are devices that provide environmental feedback by transforming a nonelectrical input into an electrical output. The applications for which these devices are used are widely varied. A brief list includes the use of sensors to determine the concentration of various gases, such as oxygen and carbon monoxide, temperature measurement devices, and pressure, radiation, and humidity sensors. Sensors have also become widely used in automotive applications. In manufacturing, because of the increasing need for waste minimization, process control, and environmentally conscious manufacturing, the increasing emphasis on sensor use and development is likely to continue to expand. The use of feedback loops in conjunction with sensors for process control/optimization has also increased in recent years. [Pg.241]

Lee J-H (2003) Review on zirconia air-fuel ratio sensors for automotive applications. J Mater 8ci 38 4247-4257 Lee J-H, Tsai C-L, Fann C-8, Wang 8-H (2002) Design of an acousto-magnetic oxygen sensor. J Med Biol Eng 22(4) 193-198... [Pg.44]

Litzelman SJ, Rothschild A, TuUer HL (2005) The electrical properties and stability of SrTi, jFe, jjOj 5 thin films for automotive oxygen sensor applications. Sens Actuators B 108 231-237 Liu P, Lee S-H, Tracy CE, Turner JA, Pitts JR, Deb SK (2003) Electrochromic and chemochromic performance of mesoporous thin-film vanadium oxide. Solid State Ionics 165 223-228 Liu RQ, Xie YH, Wang JD, Li ZJ, Wang BH (2006) Synthesis of ammonia at atmospheric pressure with Ce M Oj-delta (M=La, Y, Gd, Sm) and their proton conduction at intermediate temperature. Solid State Ionics 177 73-76 Logothetis EM (1980) Resistive-type exhaust gas sensors. Ceram Eng Sd Proc 2 281-301... [Pg.110]

The major ceramic applications for spinels are the magnetic ferrospinels (ferrites), chromite brick and spinel colors (see table). Magnetic recording tape coated with a-CrjOj is a relatively recent development. Also used as a porous protective coating in oxygen sensors for automotive emission controls. [Pg.788]

Electrochemical detectors have traditionally been used for sampling simple gases of interest, whether it is carbon monoxide, ammonia, or oxygen. These sensors are used in the automotive industry, medical field, and for emission monitoring. In the vast majority of cases, the sample gas concentration varies slowly. For these applications a fast sensor response (1-... [Pg.143]


See other pages where Automotive applications, oxygen sensors is mentioned: [Pg.266]    [Pg.344]    [Pg.345]    [Pg.371]    [Pg.352]    [Pg.481]    [Pg.376]    [Pg.54]    [Pg.233]    [Pg.989]    [Pg.2041]    [Pg.713]    [Pg.136]    [Pg.121]    [Pg.104]    [Pg.311]    [Pg.431]   
See also in sourсe #XX -- [ Pg.251 , Pg.252 , Pg.253 , Pg.254 , Pg.255 , Pg.256 , Pg.257 , Pg.258 , Pg.259 , Pg.260 , Pg.261 , Pg.262 ]




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