Abstract:
A gas sensor is disclosed comprising an oxygen pump cell having at least one exterior pump electrode (40, 42) and at least one interior pump electrode (44, 46) disposed on opposite sides of a first solid electrolyte layer (30). An emf cell having a first and second emf electrodes (50, 52) and first and second reference gas electrodes (54, 56) are disposed on opposite sides of a second solid electrolyte layer (32). At least one insulating layer (22) is in contact with the first and second emf electrodes (50, 52). At least one via hole (60, 62) is disposed through the first solid electrolyte layer (30). At least one air channel (80, 82) is disposed through at least one insulating layer (22). An air vent (84) is disposed in at least one insulating layer (24) in contact with the first and second reference gas electrodes (54, 56). A heater (934) is disposed in thermal communication with the sensor. And at least five electrical leads are in electrical communication with said sensor. A method of using a gas sensor is also disclosed.
Abstract:
A system (144) comprising a sensor (22), a reformer (146), a reformer electronic control module (150) and a sensor control module (152), wherein the sensor (22) includes an oxygen pump cell (24); an oxygen pump chamber (26); an emf cell (32); a reference chamber (34) providing a fluid connection to the reference gas (30); gas channels in fluid communication with the pump (48,52) and emf electrodes (64,66), the reference gas (30) comprising reformate produced by fuel reformer (146) fuelled by an air-fuel gas mixture having an air-fuel ratio; a heater (72); a temperature sensor (70) disposed in communication with the heater (72) and the sensor control module (152) for maintaining the sensor (22) at a desired operating temperature; a closed loop controlled operation amplifier (40) in electrical communication with the sensor (22), whereby the oxygen pump cell (24) provides sufficient oxygen ions to oxidize an incoming diffusion-limiting fuel flux to the emf cell (32) and maintain a constant emf at the emf cell (32), and wherein a current value represents an equivalent to the air-fuel ratio of the air-fuel gas mixture.
Abstract:
A gas sensor, comprising an oxygen pump cell with a first pump electrode (40) and a second pump electrode (42) disposed on opposite sides of a first solid electrolyte layer (30) and a second pump electrode (42). The sensor also comprises an emf cell with an emf electrode (44) and a reference gas electrode (46) disposed on opposite sides of a second solid electrolyte layer (32). The emf electrode (44) is disposed in fluid communication to the second pump electrode (42). A via hole (50) is disposed through the first solid electrolyte layer (30), such that the first pump electrode (40) is in fluid communication with the second pump electrode (42). A protective insulating layer (20), having a passage for gas to be sensed, is disposed in contact with the first pump electrode (40). A first insulating layer (22), having a conduit (54), is disposed in contact with the emf electrode (44). A second insulating layer (24), having an air channel (56), is disposed in contact with the reference gas electrode (46). A heater (60) is disposed in thermal communication with the emf cell. At least four electrical leads are in electrical communication with the sensor. A method of producing a gas sensor is disclosed.
Abstract:
The electrolyte (30) comprises up to about 80 wt% zirconia, up to about 30 wt% stabilizer, and up to about 40 wt% dopant-zirconia. Alternatively, the electrolyte (30) can comprise zirconia having a phase chemistry, wherein the phase chemistry, at about 25°C, is about 15 wt% to about 35 wt% monoclinic, less than about 10 wt% tetragonal, balance cubic, based upon the weight of the zirconia in the electrolyte (30).
Abstract:
A conductive co-fired body for an electrochemical cell for an exhaust sensor comprises zirconia, yttrium oxide, and alumina. The body comprises about 15 to about 30 weight% monoclinic phase zirconia. This produces an electrochemical cell having low impedance wherein the zirconia body and alumina body are co-fired. One method for manufacturing the electrochemical cell comprises combining zirconia, yttria, and alumina with solvent and dispersant to form a mixture. After, binder is added to the mixture which is then de-aired and cast onto a tape surface. The tape is dried, metallized, and laminated to an unfired alumina surface. The structure is then co-fired to form a body for said electrochemical cell.
Abstract:
The electrolyte (30) comprises up to about 80 wt% zirconia, up to about 30 wt% stabilizer, and up to about 40 wt% dopant-zirconia. Alternatively, the electrolyte (30) can comprise zirconia having a phase chemistry, wherein the phase chemistry, at about 25°C, is about 15 wt% to about 35 wt% monoclinic, less than about 10 wt% tetragonal, balance cubic, based upon the weight of the zirconia in the electrolyte (30).
Abstract:
A gas sensor, comprising an oxygen pump cell with a first pump electrode (40) and a second pump electrode (42) disposed on opposite sides of a first solid electrolyte layer (30) and a second pump electrode (42). The sensor also comprises an emf cell with an emf electrode (44) and a reference gas electrode (46) disposed on opposite sides of a second solid electrolyte layer (32). The emf electrode (44) is disposed in fluid communication to the second pump electrode (42). A via hole (50) is disposed through the first solid electrolyte layer (30), such that the first pump electrode (40) is in fluid communication with the second pump electrode (42). A protective insulating layer (20), having a passage for gas to be sensed, is disposed in contact with the first pump electrode (40). A first insulating layer (22), having a conduit (54), is disposed in contact with the emf electrode (44). A second insulating layer (24), having an air channel (56), is disposed in contact with the reference gas electrode (46). A heater (60) is disposed in thermal communication with the emf cell. At least four electrical leads are in electrical communication with the sensor. A method of producing a gas sensor is disclosed.