With Heating Or Temperature Sensing Patents (Class 205/785)
  • Patent number: 10900433
    Abstract: An oxygen sensor system includes an oxygen sensor and associated circuitry connected thereto. The oxygen sensor including a reference cell. The associated circuitry measures the impedance of the reference cell at time intervals, wherein the time intervals include a random component.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: January 26, 2021
    Inventors: Mark W. Gose, Jerry W. Campbell
  • Patent number: 10768152
    Abstract: There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, the mixture being pressurised to a level which is above local atmospheric pressure. The method comprises the steps of positioning a gas analysis sensor (14) within a pressure vessel (10); exposing the sensor to the mixture of gasses at the pressure level found in the pressure vessel; operating the sensor to measure the actual partial pressure of the at least one gas in the mixture contained in the vessel; and periodically calibrating the sensor by directing a calibrating gas mixture (20, 22) to the sensor in the chamber, the calibrating gas mixture being breathable by a human being.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: September 8, 2020
    Assignee: Fathom Systems Limited
    Inventor: Gareth Kerr
  • Patent number: 9057690
    Abstract: An electrochemical gas sensor testing device that includes a test signal generator that generates a multiplexed signal that includes a first test signal that includes alternating current (AC) and is free from a direct current (DC) component and a second signal that includes a DC bias voltage, an electrochemical cell that includes a counter electrode, a sensing electrode, and an electrolyte, the counter electrode and the sensing electrode being in electrical communication with the electrolyte and each other, the counter electrode being in electrical communication with the signal generator to receive the multiplexed signal generated by the signal generator, and a processor that receives an AC signal from the sensing electrode and that analyzes the AC signal.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: June 16, 2015
    Assignee: Sensor Electronics Corporation
    Inventor: Patrick G. Smith
  • Patent number: 9034170
    Abstract: Electrode configurations for electric-field enhanced performance in catalysis and solid-state devices involving gases are provided. According to an embodiment, electric-field electrodes can be incorporated in devices such as gas sensors and fuel cells to shape an electric field provided with respect to sensing electrodes for the gas sensors and surfaces of the fuel cells. The shaped electric fields can alter surface dynamics, system thermodynamics, reaction kinetics, and adsorption/desorption processes. In one embodiment, ring-shaped electric-field electrodes can be provided around sensing electrodes of a planar gas sensor.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: May 19, 2015
    Assignee: University of Florida Research Foundation, Inc.
    Inventors: Bryan M. Blackburn, Eric D. Wachsman, Frederick Martin Van Assche, IV
  • Patent number: 8943799
    Abstract: In a control device for an internal combustion engine including an air-fuel ratio sensor that includes a catalyst layer that covers an exhaust gas-side electrode, an oxygen storage capacity of the catalyst layer is acquired based on a sensor output of the air-fuel ratio sensor. The sensor output is corrected if the oxygen storage capacity is higher than a predetermined value and the sensor output is in a predetermined range in the vicinity of the theoretical air-fuel ratio. Preferably, the oxygen storage capacity is calculated by integrating the product of a deviation amount ?A/F of the sensor output with respect to the theoretical air-fuel ratio and a dwell time thereof. A correction period in which a correction operation is performed is set based on the oxygen storage capacity.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: February 3, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Takanori Sasaki
  • Patent number: 8852414
    Abstract: A system and method are disclosed for utilizing sensors with existing devices. An interface module is used in combination with a newer sensor, such as a fluorescence oxygen sensor, and an older legacy device. The older legacy device supplies a polarizing voltage, and anticipates a measured current of between 0 and 100 nA. The newer sensor requires no polarizing voltage and delivers an output of 0-10 volts in one embodiment, and 4-20 mA in another embodiment. The interface module receives the output from the sensor, and converts it into a useable signal to the legacy device. In another embodiment, the interface module comprises a number of outputs, such that both legacy devices and newer devices can be in communication with the sensor simultaneously. The interface module can be used in conjunction with a reactor chamber or other pharmaceutical process.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: October 7, 2014
    Assignee: EMD Millipore Corporation
    Inventors: Michael Joens, Ricky F. Baggio
  • Patent number: 8852421
    Abstract: A system and method are disclosed for utilizing sensors with existing devices. An interface module is used in combination with a newer sensor, such as a fluorescence oxygen sensor, and an older legacy device. The older legacy device supplies a polarizing voltage, and anticipates a measured current of between 0 and 100 nA. The newer sensor requires no polarizing voltage and delivers an output of 0-10 volts in one embodiment, and 4-20 mA in another embodiment. The interface module receives the output from the sensor, and converts it into a useable signal to the legacy device. In another embodiment, the interface module comprises a number of outputs, such that both legacy devices and newer devices can be in communication with the sensor simultaneously. The interface module can be used in conjunction with a reactor chamber or other pharmaceutical process.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: October 7, 2014
    Assignee: EMD Millipore Corporation
    Inventors: Michael Joens, Ricky F. Baggio
  • Patent number: 8828205
    Abstract: Disclosed is a gas sensor, particularly a lambda probe, for determining the oxygen concentration in the exhaust gas of an internal combustion engine that is operated using a fuel-air mixture. Said gas sensor comprises a pump cell with an outer electrode that is exposed to the exhaust gas, an inner electrode located in a measuring chamber which is separated from the exhaust gas by means of a first diffusion barrier, and an electronic circuit for generating a voltage applied between the outer electrode and the inner electrode as well as for measuring and evaluating a pump current that is generated in said process in order to draw a conclusion therefrom about the composition of the fuel-air mixture.
    Type: Grant
    Filed: October 16, 2006
    Date of Patent: September 9, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Lothar Diehl, Thomas Seiler
  • Patent number: 8795491
    Abstract: A method of processing a sensor element includes the steps of: (a) preparing a gas atmosphere containing hydrocarbon, having an air-fuel ratio of 0.80 to 0.9999, and having a small amount of oxidizing gas added thereto; and (b) subjecting a sensor element to a heat treatment in the gas atmosphere at a temperature of 500° C. or higher for 15 minutes or longer. The sensor element includes an electrochemical pumping cell constituted of an oxygen-ion conductive solid electrolyte and an electrode having a NOx reduction ability. A NOx gas in a measurement gas is reduced or decomposed in the electrode. A NOx concentration in the measurement gas is obtained based on a current which flows in the electrochemical pumping cell at a time of the reduction or decomposition.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: August 5, 2014
    Assignees: NGK Insulators, Ltd., NGK Ceramic Device Co., Ltd.
    Inventors: Tetsuya Ishikawa, Sumiko Horisaka, Yuji Okuda
  • Publication number: 20140183060
    Abstract: A method for diagnosing an electrical lead to an electrode of a sensor element, for sensing at least one property of a measured gas in a measured gas space, in particular for sensing a proportion of a gas component in the measured gas or a temperature of the measured gas, is described. A measured signal indicating an internal resistance of a pump cell of the sensor element is investigated for regularity upon switching on of the control unit. Upon identification of at least one irregularity of the measured signal, a suspected fault in the lead is identified and at least one substitute action is taken. The substitute action is selected from: an application of control to the heating element which is provided for a fault situation, a check of the validity of the measured signal, and a monitoring of the heating element. A sensor apparatus is also described.
    Type: Application
    Filed: December 24, 2013
    Publication date: July 3, 2014
    Applicant: ROBERT BOSCH GMBH
    Inventors: Richard HOLBERG, Albrecht SCHMIDT, Christoph HAGNER
  • Patent number: 8470147
    Abstract: A sensor for detecting a gas is provided. The gas sensor may have a sensing section, a heating section, and a resistance temperature detector. The resistance temperature detector may be co-fired to be integral with at least one of the sensing section and the heating section.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: June 25, 2013
    Assignee: Caterpillar Inc.
    Inventors: Balakrishnan G. Nair, Jesse Nachlas, Gangqiang Wang
  • Patent number: 8414752
    Abstract: A mixed potential NOx sensor apparatus for measuring the total NOx concentration in a gas stream is disclosed. The NOx sensing apparatus comprises a multilayer ceramic structure with electrodes for sensing both oxygen and NOx gas concentrations and includes screen-printed metallized patterns that function to heat the ceramic sensing element to the proper temperature for optimum performance. This design may provide advantages over the existing technology by miniaturizing the sensing element to provide potentially faster sensor light off times and thereby reduce undesired exhaust gas emissions. By incorporating the heating source within the ceramic sensing structure, the time to reach the temperature of operation is shortened, and thermal gradients and stresses are minimized. These improvements may provide increased sensor performance, reliability, and lifetime.
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: April 9, 2013
    Assignee: EmiSense Technologies, LLC
    Inventors: Balakrishnan G. Nair, Jesse Nachlas
  • Patent number: 8257578
    Abstract: An anomaly diagnosing apparatus and method for a gas sensor which includes a heater control section; a measurement section which outputs a detection signal for detecting an internal resistance of the gas sensor through a solid electrolyte via connection terminals and the electrodes within the gas sensor and which measures the internal resistance of the gas sensor based on a response signal input via the connection terminals in response to the output of the detection signal; and a diagnosing section which heats the solid electrolyte by use of the heater control section, obtains, after the start of heating, a first time required to reach a first resistance and a second time required to reach a second resistance different from the first resistance, and determines whether or not the gas sensor is anomalous by comparing a predetermined threshold value and a ratio of the first to second times.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: September 4, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Satoshi Teramoto, Shigeki Mori, Hiroki Inouchi
  • Patent number: 8211293
    Abstract: A method of correcting NOx sensor includes the steps of preparing a corrective map in advance, finding an existing proportion of NO or NO2 in a mixture of NOx in exhaust gases before coming into an NOx sensor, and correcting an NOx concentration that the NOx sensor detects actually. The corrective map records relationships between temperature physical quantities that are relevant to a temperature of the exhaust gases, oxygen-concentration physical quantities that are relevant to an oxygen concentration in the exhaust gases, and the existing proportion. The existing proportion is found with reference to the corrective map using the temperature physical quantities and oxygen-concentration physical quantities that are detected actually. The NOx concentration is corrected on the basis of not only the existing proportion but also a difference between an NO2 diffusion velocity and an NO diffusion velocity.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: July 3, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroki Nishijima, Takeshi Hirabayashi, Fumitaka Kato
  • Patent number: 8187454
    Abstract: A degradation detector of an exhaust gas sensor is disclosed. The detector comprises a first heater resistance estimator (16) for estimating a resistance of a heater that heats the exhaust gas sensor, based on a device resistance of the exhaust gas sensor; a heater resistance calculator (17) for calculating a resistance of the heater, based on a heater current of the heater; and a degradation determiner (18) for determining whether the exhaust gas sensor is degraded, by comparing the estimated resistance of the heater and the calculated resistance of the heater.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: May 29, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Haruki Fukuda
  • Patent number: 8182664
    Abstract: A sensor control device for controlling a current application state of a gas sensor element when measuring a specific gas component concentration in a gas to be measured using the gas sensor element, which sensor control device includes: at least one cell having a solid electrolyte body and a pair of electrodes; a sensor heating unit as defined herein; an oxygen reference pole generating unit as defined herein; a damage avoidance time elapse determining unit as defined herein; and a reference generation current application permitting unit as defined herein.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: May 22, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Masamichi Hiraiwa, Nobuhiro Inoue, Satoshi Teramoto, Yukinobu Nagao
  • Patent number: 8163161
    Abstract: A gas sensor for detecting particles in a gas stream has a first electrochemical pump cell, which has a measuring chamber in which a first electrode is disposed to pump particles between the first measuring chamber and the gas stream. Furthermore, a second electrochemical pump cell is provided, which has a second measuring chamber in which a second electrode is disposed so as to pump particles. The second measuring chamber is connected to the gas stream via an absorber medium for absorption of the particles to be detected. This makes it possible to absorb the particles to be detected in a first operating mode using the absorber medium, and to desorb the absorbed particles in a second operating mode, and to detect the quantity of the desorbed particles. Thus, the gas sensor is able to take even low concentrations into account, and short-term measuring errors do not have such a serious effect.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: April 24, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Jens Schneider, Detlef Heimann, Goetz Reinhardt, Henrico Runge, Lothar Diehl, Juergen Ruth, Thomas Seiler
  • Patent number: 8152979
    Abstract: An ammonia gas sensor including a reference electrode (320) is formed on the back surface of a solid electrolyte member (310), and a detection electrode (335) is formed on the front surface of the solid electrolyte member (310). A detection lead (350) is provided on the front surface of the solid electrolyte member (310) such that the detection lead (350) is connected to the detection electrode (335). An insulating layer (340), (380) is provided between the detection lead (350) and the solid electrolyte member (310), or on the detection lead (350).
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: April 10, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Satoshi Sugaya, Hiroyuki Nishiyama, Wataru Matsutani, Shiro Kakimoto
  • Patent number: 8097137
    Abstract: To provide a gas sensor element having a base body whose durability is unlikely to deteriorate during the use and exhibiting excellent endurance and responsiveness. [Means for Solution] A gas sensor element 2 comprising: a closed-bottomed cylindrical base body 28 made of solid electrolyte which contains zirconia as a principal component; an outer electrode 26 formed on an outer surface of the base body 28; an inner electrode 27 formed on an inner surface of the base body 28; and an adhesive layer 29 formed between the base body 28 and the outer electrode 26 and containing zirconia as a principal component, wherein a proportion of tetragonal in zirconia particles of the base body 28 falls within the range from 45% or more to 60% or less and, wherein a proportion of tetragonal in zirconia particles of the adhesive layer 29 is greater than that of tetragonal in zirconia particles of the base body 28.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: January 17, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Koji Shiono, Kunio Imai
  • Patent number: 8012325
    Abstract: A plural-cell gas sensor including at least an oxygen pump cell (40) comprising a solid electrolyte ceramic layer; an internal space (210) formed between the cells; and a heater substrate (190) arranged on the side of the oxygen pump cell; the heater substrate heating the oxygen pump cell that pumps oxygen out of the internal space.
    Type: Grant
    Filed: July 3, 2006
    Date of Patent: September 6, 2011
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Seiji Oya, Mineji Nasu
  • Patent number: 7967964
    Abstract: A single cell oxygen sensor apparatus and method are disclosed. An yttrium-based stabilized layer having electrical terminals connected to the yttrium-based stabilized layer can be provided on a substrate, wherein the yttrium-based stabilized layer is excitable by a constant current applied to the electrical terminals. A plurality of electrodes are located on a side of the yttrium-based stabilized layer and a plurality of heater elements located on said substrate opposite said yttrium-based stabilized layer. The heater elements can maintain the yttrium-based stabilized layer at a particular temperature. A cavity is formed and located between the yttrium-based stabilized layer and the heater elements. The partial pressure of oxygen can be measured by comparing the partial pressure of oxygen within the cavity with respect to the partial pressure of oxygen in the atmosphere external to the single cell oxygen sensor apparatus.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: June 28, 2011
    Assignee: Honeywell International Inc.
    Inventors: Ramsesh Anilkumar, Peter J. M. Kroot, Baburaj Kaimalilputhenpura Prabhakaran, Vishal Malhan, Palani Thanigachalam
  • Patent number: 7955494
    Abstract: The gas sensor control apparatus is for controlling a gas sensor including a sensor element having a solid electrolyte layer, and first and second electrodes located on opposite sides of the solid electrolyte layer, the first electrode serving as a gas detecting electrode, the second electrode serving as a reference electrode, the sensor element generating, as a sensor output, a current flowing between the first and second electrodes having a value depending on concentration of a specific gas component contained in a gas under measurement. The gas sensor control apparatus includes a determination function of determining whether or not it is time for the gas sensor to start operation, and a control function of forcibly supplying oxygen from a side of the second electrode to a side of the first electrode on a temporary basis when a determination result of the first function becomes affirmative.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: June 7, 2011
    Assignee: Denso Corporation
    Inventors: Tomoo Kawase, Eiichi Kurokawa, Toshiyuki Suzuki, Takahito Masuko
  • Patent number: 7909970
    Abstract: An oxygen sensor is employed for determining whether the exhaust air-fuel ratio is rich or lean. A voltage is applied to the oxygen sensor at device impedance calculation intervals to calculate device impedance. After device impedance calculation, a reverse voltage is applied to the oxygen sensor with a view toward promptly negating the influence of voltage application on the sensor output. Subsequently, the sensor output of the oxygen sensor is sampled at sampling time intervals until it is concluded that the device impedance calculation period is over.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: March 22, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kenji Tashiro, Kazutaka Hattori
  • Patent number: 7901562
    Abstract: A deterioration detection apparatus for an oxygen sensor is able to detect an abnormality of the oxygen sensor constantly with high precision, without being affected by the temperature characteristic of the element impedance. The apparatus applies a voltage V to the oxygen sensor, and calculates an element impedance real value Rsr=V/1 of a sensor element based on the applied voltage and the current I caused to flow by the voltage. The apparatus calculates an element temperature estimated value Tex of the oxygen sensor from a factor that affects the temperature of the oxygen sensor. The apparatus determines whether the oxygen sensor has an abnormality on the basis of whether the relationship between the element impedance real value Rsr and the element temperature estimated value Tex can be regarded as a relationship that agrees with a normal temperature characteristic.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: March 8, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Kazutaka Hattori
  • Patent number: 7887685
    Abstract: A gas sensor for detecting NOX is provided. The gas sensor may have a plurality of substrate members, a first sensing electrode, and a second sensing electrode. The gas sensor may also have a first heater element associated with the first sensing electrode and being located on a first side of one of the plurality of substrate members, and a second heater element associated with the second sensing electrode and being located on a second opposing side of the one of the plurality of substrate members.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: February 15, 2011
    Assignee: Caterpillar Inc.
    Inventors: Balakrishnan G. Nair, Jesse Alan Nachlas
  • Patent number: 7867370
    Abstract: A gas sensor element has a solid electrolyte body of oxygen ionic conductivity, a target gas electrode and a reference gas electrode formed on both surfaces of the solid electrolyte body, respectively, a porous diffusion resistance layer, and a catalyst support trap layer. The porous diffusion resistance layer covers the target gas electrode and through which target gases to be measured are passing. The catalyst support trap layer is formed on the outer surface of the porous diffusion resistance layer and supports noble metal catalyst. In the gas sensor element, the noble metal catalyst is made of platinum, rhodium, palladium supported in the catalyst support trap layer. In particular, an addition amount of palladium in the total amount of the noble metal catalyst is within a range of 2 to 65 wt %.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: January 11, 2011
    Assignee: Denso Corporation
    Inventors: Nobuyuki Tsuji, Akio Tanaka, Keigo Mizutani
  • Patent number: 7744740
    Abstract: In a procedure to recognize the gas composition of a gas mixture, which consists of at least two gases of preferably different diffusion properties, delivered to a wideband lambda sensor, especially a gas mixture of an exhaust gas of an internal combustion engine of a motor vehicle, whereby the lambda sensor has a pumping cell with at least one gas measurement chamber, provision is made for the recognition of the gas composition of the gas mixture to result by means of modulation of the gas in the gas measurement chamber. Preferably the air number in the gas measurement chamber of the pumping cell is periodically altered, whereby the sensitivity of the lambda sensor to the gases, of which there are at least two, likewise periodically changes.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: June 29, 2010
    Assignee: Robert Bosch GmbH
    Inventor: Lothar Diehl
  • Publication number: 20100108540
    Abstract: A gas sensor control apparatus includes a heater regulating section to control the supply of electricity to a heater included in a gas sensor, an impedance sensing section to sense an impedance of a cell of the gas sensor, and an impedance condition examining section to examine whether the sensed impedance is greater than or equal to a predetermined abnormality judging threshold. The control apparatus further includes a voltage condition examining section to examine whether a maximum effective voltage is applied to the heater, when the impedance is above the predetermined abnormality judging threshold, a duration measuring section to examine whether an application time duration of the maximum effective voltage becomes equal to or longer than a predetermined heater overheat preventing time, and a voltage decreasing section to decrease the heater application voltage to such a lower effective voltage as to hold the temperature of the cell higher than or equal to 500° C.
    Type: Application
    Filed: November 5, 2009
    Publication date: May 6, 2010
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Akiyoshi Kato, Keiji Suzuki
  • Publication number: 20100084287
    Abstract: An anomaly diagnosing apparatus and method for a gas sensor which includes a heater control section; a measurement section which outputs a detection signal for detecting an internal resistance of the gas sensor through a solid electrolyte via connection terminals and the electrodes within the gas sensor and which measures the internal resistance of the gas sensor based on a response signal input via the connection terminals in response to the output of the detection signal; and a diagnosing section which heats the solid electrolyte by use of the heater control section, obtains, after the start of heating, a first time required to reach a first resistance and a second time required to reach a second resistance different from the first resistance, and determines whether or not the gas sensor is anomalous by comparing a predetermined threshold value and a ratio of the first to second times.
    Type: Application
    Filed: October 1, 2009
    Publication date: April 8, 2010
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Satoshi TERAMOTO, Shigeki Mori, Hiroki Inouchi
  • Patent number: 7628907
    Abstract: A gas sensor is provided for detecting one or more gases in a gas sample. The gas sensor includes a substrate, a solid electrolyte layer including lanthanum oxide for sensing carbon dioxide, a heating element thermally coupled to the solid electrolyte layer, and a controller coupled to the heating element and the solid electrolyte layer. The controller heats the heating element so that the solid electrolyte layer reaches an operating. Methods of sensing carbon dioxide and humidity are also disclosed.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: December 8, 2009
    Assignee: Honeywell International Inc.
    Inventors: Yuandong Gu, Barrett E. Cole, Robert E. Higashi
  • Patent number: 7611612
    Abstract: A mixed potential NOx sensor apparatus for measuring the total NOx concentration in a gas stream is disclosed. The NOx sensing apparatus comprises a multilayer ceramic structure with electrodes for sensing both oxygen and NOx gas concentrations and includes screen-printed metalized patterns that function to heat the ceramic sensing element to the proper temperature for optimum performance. This design may provide advantages over the existing technology by miniaturizing the sensing element to provide potentially faster sensor light off times and thereby reduce undesired exhaust gas emissions. By incorporating the heating source within the ceramic sensing structure, the time to reach the temperature of operation is shortened, and thermal gradients and stresses are minimized. These improvements may provide increased sensor performance, reliability, and lifetime.
    Type: Grant
    Filed: July 14, 2005
    Date of Patent: November 3, 2009
    Assignee: Ceramatec, Inc.
    Inventors: Balakrishnan G. Nair, Jesse Nachlas
  • Patent number: 7524407
    Abstract: An oxygen sensor 10 includes an oxygen detection element 20, which assumes a hollow tubular shape extending along the axis. The oxygen detection element 20 has a closed tip end and an opened rear end. An internal electrode layer 23 is formed on an inner circumferential surface 22 of the oxygen detection element 20. The sensor 10 also has a terminal member 30 which is in contact with the internal electrode layer 23 and in electrical connection therewith. The terminal member 30 has press contact portions 34c and 34d which come into press contact with the inner circumferential surface 22 of the oxygen detection element 20 to hold the terminal member 30 in the oxygen detection element 20, and conduction portions 35b which come into press contact with the internal electrode layer 23 on the inner circumferential surface 22 of the oxygen detection element 20 and into electrical connection with the internal electrode layer 23.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: April 28, 2009
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Makoto Hirasawa, Shohei Yoshiyasu, Yoshiaki Matsubara
  • Patent number: 7481915
    Abstract: A system for determining a temperature of exhaust gases from an engine is provided. The system includes an exhaust gas sensor having an electric heating coil. The sensor communicates with exhaust gases from the engine. The system further includes an electrical circuit for generating a signal indicative of the resistance of the heating coil when the coil is not energized. Finally, the system includes a controller receiving the signal and calculating the temperature of the exhaust gases based on the signal.
    Type: Grant
    Filed: September 12, 2003
    Date of Patent: January 27, 2009
    Assignee: Ford Global Technologies, LLC
    Inventors: Christopher K. Davey, David Robert Nader, Kenneth John Behr, Michael Igor Kluzner, Michael James Uhrich, Robert Joseph Jerger
  • Publication number: 20080217187
    Abstract: The present invention provides oxygen partial pressure control apparatuses that can control the partial pressure of oxygen in atmospheric gases in processing apparatuses or the like to within the range of 0.2 to 10?30 atm, while maintaining low material and operational cost conditions.
    Type: Application
    Filed: May 19, 2005
    Publication date: September 11, 2008
    Applicants: National Institute of Advanced Industrial Science and Technology, STLAB, Incorporated
    Inventors: Naoki Shirakawa, Shinichi Ikeda, Katsuhide Uchida
  • Patent number: 7316767
    Abstract: Provided is a multilayer gas sensing element having a high measurement accuracy and less susceptible to a leakage current. The element comprises an oxygen pump cell for adjusting an oxygen concentration in a measured gas chamber, a sensor cell for detecting a specified gas concentration in the measured gas chamber, and a heater for heating the cells up to an activating temperature. The heater includes a heat generator for generating heat when energized, a heater terminal provided externally and a heater lead for making electrical connection therebetween. When the electrical resistance value of the heat generator is taken as RH and the electrical resistance value of the heater lead is taken as RL, these values are set to satisfy the relationship of 1.5?RH/RL.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: January 8, 2008
    Assignee: Denso Corporation
    Inventor: Akio Tanaka
  • Patent number: 7294252
    Abstract: Disclosed herein are NOx sensors and methods of using the same. In one embodiment, a method for sensing NOx comprises: contacting a first NOx electrode with the gas, contacting a second NOx electrode with the gas, determining a NO2 emf between the first NOX electrode and a first reference electrode, determining a NOx emf between the second NOx electrode and a second reference electrode, and determining a NO2 concentration and a NO concentration using the NO2 emf and the NOx emf. The first electrode can be at a first temperature of greater than or equal to about 700° C., and the second electrode can be at a second temperature of about 500° C. to about 650° C.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: November 13, 2007
    Assignee: Delphi Technologies, Inc.
    Inventors: Da Yu Wang, Walter T. Symons, Robert Jerome Farhat, Sheng Yao, Joachim Kupe
  • Patent number: 7285204
    Abstract: In detecting a deterioration of an air-fuel ratio sensor, a sensor output change speed integrated value is calculated when an element temperature of a solid electrolyte is stabilized at a low temperature. Successively, a sensor output change speed integrated value is calculated when the solid electrolyte element is stabilized at a high temperature. Finally, a deviation between the change speed integrated values is calculated. By comparing the deviation amount with a predetermined determinant, presence or absence of the deterioration is determined.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: October 23, 2007
    Assignee: Denso Corporation
    Inventors: Hisashi Iida, Syujiro Morinaga, Yoshiyuki Okamoto
  • Patent number: 6916415
    Abstract: A method and device for driving a gas sensor includes a three-point circuit determining a temperature of a gas sensor having a resistive heating element by determining a measuring current with a measuring resistor flowing through the resistor in a measuring phase. The three-point measurement makes it possible to determine accurately the line resistance of an incoming line branch, which can also be used approximately for the line resistance of another incoming line branch. Naturally, the tap may also be provided on the incoming line side.
    Type: Grant
    Filed: May 28, 2002
    Date of Patent: July 12, 2005
    Assignee: Siemens Aktiengesellschaft
    Inventor: Tim Walde
  • Patent number: 6849174
    Abstract: A gas concentration measuring apparatus which has a gas sensor designed to measure, for example, the concentrations of O2 and HOx contained in exhaust emissions of an automotive engine is provided. The apparatus includes a signal processing circuit which converts a current signal outputted from the gas sensor as a function of the concentration of either of O2 and NOx into a voltage signal. The gas sensor and the signal processing circuit are connected electrically through a conductor. The conductor has a length which is determined as a function of a level of the current signal outputted from the gas sensor. The weaker the level of the current signal is, the shorter the length of the conductor. This minimizes addition of electrical noises to the current signal outputted from the gas sensor.
    Type: Grant
    Filed: February 26, 2003
    Date of Patent: February 1, 2005
    Assignee: Denso Corporation
    Inventors: Satoshi Hada, Eiichi Kurokawa, Tomoo Kawase, Toshiyuki Suzuki, Satoshi Haseda
  • Patent number: 6660143
    Abstract: A sensor structure having a metallic terminal member. The metallic terminal member 23 includes press portions 23d and 23e, which press the heating member 3 in a direction intersecting the center axis of a hollow portion 2a of an oxygen detection element 2. Holding means for holding the heating member 3 is formed separately from the metallic terminal member 23. Thus, without use of special heating-member holder means, the metallic terminal member 23 can bring at least a portion of the heating member 3 into contact with the inner wall surface of the hollow portion 2a of the oxygen detection element 2.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: December 9, 2003
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Shoji Akatsuka, Satoshi Ishikawa
  • Patent number: 6649041
    Abstract: The invention provides a deterioration detector for an exhaust gas sensor capable of detecting an amount of change with age of an internal resistance and conducting deterioration judgment taking into consideration fluctuation between products and temperature dependency of the internal resistance of the exhaust gas sensor.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: November 18, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kohji Hashimoto, Masaharu Yuhara
  • Patent number: 6592731
    Abstract: A low cost amperometric oxygen sensor which utilizes a plurality of oxygen ion conductor layers interposed between a plurality of oxygen-porous electrode layers is provided. Oxygen from a sample gas enters the sensor at porous cathode electrodes, is pumped through the ion conductor layers, and exits through the anode electrodes. The amperometric current generated is representative of the partial pressure of oxygen in the sample gas. In accordance with one embodiment of the present invention, an amperometric oxygen sensor is provided for determining the oxygen partial pressure of a gas. The sensor comprises a sensor body defined by a plurality of oxygen-porous electrode layers and at least one oxygen ion conductor layer. The plurality of oxygen-porous electrode layers include at least one cathode layer and at least one anode layer. Each of the cathode layers define first and second major cathode surfaces and each of the anode layers defining first and second major anode surfaces.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: July 15, 2003
    Assignee: CeramPhysics, Inc.
    Inventor: William N. Lawless
  • Publication number: 20030106808
    Abstract: Apparatus for detecting the NOx concentration includes a first measurement chamber 20 communicating with the gas under measurement via a diffusion rate defining layer 4d and a second measurement chamber 26 communicating with the first measurement chamber 20 via diffusion limiting layers 6d, 22d. A first pump current IP1 is controlled so that an output of a Vs cell 6 will be equal to the reference voltage VCO for controlling the oxygen concentration in the first measurement chamber 20 to a pre-set low value. A constant voltage is applied across the second pump cell 8 for decomposing the NOx component in the second measurement chamber 26 for pumping out oxygen for detecting the NOx concentration from a second pump current IP2. The sensor temperature is detected from the internal resistance of the Vs cell for controlling the current supplied to the heaters 12, 14. If the temperature of the gas under measurement is changed rapidly, the sensor temperature is changed.
    Type: Application
    Filed: December 27, 2002
    Publication date: June 12, 2003
    Inventors: Shigeru Miyata, Noriaki Kondo, Hiroshi Inagaki
  • Publication number: 20030101569
    Abstract: A heater is inserted into an inside chamber of a sensor element until a tip end of the heater is surely brought into contact with a bottom surface of the inside chamber. Next, a metallic holder is attached on an outside surface of the heater. Then, the metallic holder is slid along the outside surface of the heater toward the bottom surface of the sensor element to engage the metallic holder with an edge of the sensor element.
    Type: Application
    Filed: January 2, 2003
    Publication date: June 5, 2003
    Applicant: DENSO CORPORATION
    Inventors: Isao Watanabe, Michihiro Yamakawa, Masanori Fukutani
  • Patent number: 6547955
    Abstract: A gas concentration measuring apparatus which has a gas sensor designed to measure, for example, the concentrations of O2 and HOx contained in exhaust emissions of an automotive engine is provided. The apparatus includes a signal processing circuit which converts a current signal outputted from the gas sensor as a function of the concentration of either of O2 and HOx into a voltage signal. The gas sensor and the signal processing circuit are connected electrically through a conductor. The conductor has a length which is determined as a function of a level of the current signal outputted from the gas sensor. The weaker the level of the current signal is, the shorter the length of the conductor. This minimizes addition of electrical noises to the current signal outputted from the gas sensor.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: April 15, 2003
    Assignee: Denso Corporation
    Inventors: Satoshi Hada, Eiichi Kurokawa, Tomoo Kawase, Toshiyuki Suzuki, Satoshi Haseda
  • Publication number: 20030052016
    Abstract: A method and system for controlling the temperature of an oxygen sensor is provided wherein the method includes obtaining an oxygen sensor, a heating device, heating control device and a signal generator, wherein the oxygen sensor includes a reference cell and wherein the heating device is communicated with the oxygen sensor and the heating control device, introducing a fixed frequency sinusoidal signal to the reference cell through a voltage divider resistor so as to create a response signal, wherein the response signal is responsive to the temperature of the reference cell, buffering the response signal so as to create a buffered signal, applying the buffered signal to a high pass filter so as to create a filtered signal having a filtered signal magnitude, wherein the filtered signal magnitude is inversely proportional to the temperature of the reference cell, measuring the filtered signal so as to create a temperature signal responsive to the filtered signal magnitude and communicating the temperature sign
    Type: Application
    Filed: September 18, 2001
    Publication date: March 20, 2003
    Inventors: Yingjie Lin, Da Yu Wang, Eric Detwiler, Paul Kikuchi
  • Patent number: 6533921
    Abstract: Apparatus for detecting the NOx concentration includes a first measurement chamber 20 communicating with the gas under measurement via a diffusion rate defining layer 4d and a second measurement chamber 26 communicating with the first measurement chamber 20 via diffusion limiting layers 6d, 22d. A first pump current IP1 is controlled so that an output of a Vs cell 6 will be equal to the reference voltage VCO for controlling the oxygen concentration in the first measurement chamber 20 to a pre-set low value. A constant voltage is applied across the second pump cell 8 for decomposing the NOx component in the second measurement chamber 26 for pumping out oxygen for detecting the NOx concentration from a second pump current IP2. The sensor temperature is detected from the internal resistance of the Vs cell for controlling the current supplied to the heaters 12, 14. If the temperature of the gas under measurement is changed rapidly, the sensor temperature is changed.
    Type: Grant
    Filed: December 18, 2000
    Date of Patent: March 18, 2003
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Shigeru Miyata, Noriaki Kondo, Hiroshi Inagaki
  • Patent number: 6524467
    Abstract: Each gas sensing element, with a measured gas sensing electrode and a reference gas sensing electrode provided on opposite surfaces of a solid electrolytic body, is manufactured to have a limit current value whose initial value is offset from a target value. Electric power is supplied to each manufactured gas sensing element to adjust the limit current value from the initial value to the target value.
    Type: Grant
    Filed: June 13, 2001
    Date of Patent: February 25, 2003
    Assignee: Denso Corporation
    Inventors: Kazuya Nakagawa, Kazuhiro Okazaki
  • Patent number: 6497808
    Abstract: A gas sensor includes a sensor element. The sensor element has a solid electrolytic member, a measurement electrode, and a reference electrode. The measurement electrode is provided on the solid electrolytic member, and is exposed to a measurement gas. The reference electrode is provided on the solid electrolytic member, and is exposed to a reference gas. A heater operates for heating the sensor element. A portion of the heater contacts a portion of the sensor element. The temperature of the sensor element is increased to 300° C. by the heater in ten seconds after the start of activation of the heater.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: December 24, 2002
    Assignee: Denso Corporation
    Inventors: Masanobu Yamauchi, Kenji Fukaya
  • Patent number: 6451187
    Abstract: A detector for an air/fuel ratio sensor, which is comprised of a structure formed by stacking an oxygen reference electrode, a dense zirconia solid electrolyte, a negative electrode, a porous zirconia solid electrolyte, a positive electrode and a porous protection film on one another, is formed over a ceramic substrate having a heater built therein. Thus, a combined air/fuel ratio sensor can be obtained which is operated in a short time (about 5 seconds or less) after power-on so as to comply with emission control applied immediately after startup and provides low power consumption and a high degree of reliability.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: September 17, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Seikou Suzuki, Masahiro Komachiya, Tsuyoshi Fujita