Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7762244 | Method and device for adapting the recording of a measured signal for an exhaust probe An exhaust probe is arranged on an internal combustion engine with multiple cylinders and the injection valves provided for the cylinders measure the fuel. The exhaust probe is arranged on an exhaust manifold, and the measured signal is characteristic of the air/fue... | 07/27/2010 |
| 7202741 | Highly linear variable gain amplifier A variable-gain amplifier circuit uses a pair of single-ended operational amplifiers to amplify complementary portions of a differential input signal. By using two single-ended amplifiers instead of a single differential amplifier, linearity is significantly improve... | 04/10/2007 |
| 7052596 | Linear lambda probe evaluation circuit The pumping current source (P) required for operating the linear lambda probe is wired in such a manner that its inverting input is connected to the third probe terminal (Vp+), its non-inverting input is connected to the potential of the mean voltage (VM), and that ... | 05/30/2006 |
| 6957562 | Passive oxygen sensor diagnostic An engine exhaust sensor diagnostic system includes an oxygen sensor and a controller. The controller monitors a signal generated by the oxygen sensor, determines a rate of change of the signal, and computes diagnostic parameters. The controller indicates malfunctio... | 10/25/2005 |
| 6939037 | Determining the temperature of an exhaust gas sensor by means of calibrated internal resistance measurement For achieving a highest possible measuring accuracy of a circuit for measuring the internal resistance of an exhaust-gas sensor, a method and a circuit for measuring the internal resistance R1 (10) of an electrochemical cell (12) are provided fo... | 09/06/2005 |
| 6918385 | Air-fuel ratio detecting apparatus of engine and method thereof A temperature of an oxygen concentration detector generating an electromotive force according to a difference between oxygen concentration in an engine exhaust gas and oxygen concentration in the atmosphere, is detected, and coefficients in a transformation for conv... | 07/19/2005 |
| 6883510 | Mixture adaptation method A method for compensating for mismatches of the precontrol of a fuel metering for an internal combustion engine. A regulation being superimposed on the precontrol. At least one correction quantity being formed, from the behavior of the regulation at high temperature... | 04/26/2005 |
| 6497135 | Controller for use with wide range oxygen sensor A voltage sensing system that has a pair of input leads having a first input lead, and a second input lead each sensing a non-grounded voltage, and an amplifier coupled to the pair of input leads, the amplifier generating an amplifier output voltage in re... | 12/24/2002 |
| 6352632 | Connector for NOx sensor A connector 2b for an NOx sensor is connected via a cable C to an end of a sensor body 2a through which a first pump current and a second pump current flow according to the concentration of oxygen and that of NOx, respectively, contained in a gas to be me... | 03/05/2002 |
| 6347544 | Control method for gas concentration sensor An A/F signal proportional to an oxygen concentration in the exhaust gas from an internal combustion engine is output upon application of a voltage based on an instruction from a microcomputer. At the time an element resistance is detected, a bias instruc... | 02/19/2002 |
| 6231735 | Oxygen linear sensor test arrangement The control arrangement comprises an oxygen linear test sensor located along the exhaust duct of an internal combustion engine, the sensor having a chamber able to receive part of the exhaust gas and two electrolytic cells of which one is electrically pil... | 05/15/2001 |
| 6192874 | Device for measuring oxygen content in a gas medium The apparatus includes a sensor capable of delivering a voltage representative of the ratio between a reference oxygen pressure and the oxygen pressure in a volume of the sensor and provided with electrodes (12, 14) via which it is possible to pass a pump... | 02/27/2001 |
| 5925088 | Air-fuel ratio detecting device and method An air-fuel ratio detecting device and a method capable of correctly and very precisely detecting the air-fuel ratio of an internal combustion engine. The air-fuel ratio detecting device comprises an air-fuel ratio sensor disposed in the exhaust system of... | 07/20/1999 |
| 5837114 | Arrangement for determining the concentration of a component in a gas mixture An arrangement for determining the concentration of a component in a gas mixture includes a first volume in which the concentration of the component is maintained constant with respect to the influence of the coupling to the concentration in the gas mixtu... | 11/17/1998 |
| 5658445 | Combination of lambda probes The invention relates to a combination of a heated lambda sensor with a stepped or binary sensor characteristic and another heated lambda sensor to determine the lambda value in a gas mixture, e.g. in the exhaust gas preferably of internal combustion engi... | 08/19/1997 |
| 5580440 | Air fuel ratio sensory A method and apparatus are disclosed for measuring atmospheric pressure in conjunction with an air-fuel ratio sensor of the type comprising a concentration cell with atmospheric air and exhaust electrodes on opposite sides of a solid-state electrolyte hav... | 12/03/1996 |
| 5429105 | Current replication circuit and method for use in exhaust gas oxygen monitoring A method and circuit for generating an output signal representative of the pumping current required to equalize the oxygen diffusion between the sensing cell and the pumping cell of an oxygen-ion concentration proportional sensor located in the exhaust sy... | 07/04/1995 |
| 5227975 | Air/fuel ratio feedback control system for internal combustion engine An air/fuel ratio feedback control system for an internal combustion engine sets an air/fuel ratio feedback correction coefficient on the basis of an air/fuel ratio for an air/fuel mixture introduced into a combustion chamber of the engine, to cause the a... | 07/13/1993 |
| 5211154 | Method and apparatus for maintaining stoichiometric air-to-fuel ratio in an internal combustion engine This invention provides an self-calibrating buffer amplifier for a Universal Exhaust Gas Oxygen sensor interface circuit which couples and processes a voltage signal proportional to pumping cell current to a level and reference voltage suitable for input ... | 05/18/1993 |
| 5182907 | System for monitoring performance of HC sensors for internal combustion engines A system which monitors the performance of at least one HC sensor arranged in an exhaust passage of and internal combustion engine. According to a first aspect of the invention, a value of output from the at least one HC sensor is stored, which is assumed... | 02/02/1993 |
| 4981125 | Output correction method for exhaust gas ingredient-concentration sensors of proportional-output type An output correction method for a proportional-output type O2 sensor including an oxygen concentration detecting element formed by an oxygen-pumping element and a cell element, each of the oxygen-pumping element and the cell element being compo... | 01/01/1991 |
| 4944274 | Air-fuel ratio control apparatus for internal combustion engines An air-fuel ratio control apparatus for an internal combustion engine includes a solid electrolyte having a first electrode disposed on one surface thereof to contact with the atmosphere and a second electrode disposed on the other surface thereof to cont... | 07/31/1990 |
| 4915813 | Oxygen concentration detecting device An oxygen concentration detecting device includes at least one oxygen concentration detecting element formed by an oxygen-pumping element and a cell element, composed of an oxygen ion-conductive wall, separating a pair of electrodes. The oxygen-pumping el... | 04/10/1990 |
| 4915077 | Air-fuel ratio control apparatus An air-fuel control apparatus comprises an air-fuel ratio sensor comprising a gap portion for introducing exhaust gas generated from an engine, a solid electrolyte oxygen pump for controlling a partial pressure of oxygen in the gap portion and a solid ele... | 04/10/1990 |
| 4841934 | Oxygen pumping device for control of the air fuel ratio A method of controlling the air fuel ratio of an internal combustion engine includes positioning a two cell oxygen pumping device in the exhaust gas of the engine. A pumping current is applied to a pumping cell and an EMF is sensed across a sensor cell. T... | 06/27/1989 |
| 4842711 | Device for detecting air-fuel ratio of engine A device for detecting the air-fuel ratio of an engine by measuring an oxygen concentration of the exhaust gas by means of an oxygen sensor including an oxygen pump and a cell element for measuring the oxygen concentration ratio, comprising an air-fuel ra... | 06/27/1989 |
| 4767520 | Device for detecting air-fuel ratio of engine A device for detecting the air-fuel ratio of an engine by measuring the oxygen concentration of the exhaust gas by means of an oxygen sensor including an oxygen pump and a cell element for measuring the oxygen concentration ratio, comprising a filter circ... | 08/30/1988 |
| 4732127 | Air/fuel ratio control system for an internal combustion engine with a function for preventing the blackening phenomenon of oxygen concentration sensor An air/fuel ratio control system for an internal combustion engine having an air supply system for controlling the air/fuel ratio of mixture to be supplied to the engine, and an oxygen concentration sensing device for sensing the oxygen concentration in t... | 03/22/1988 |
| 4721084 | Method for controlling an oxygen concentration sensor for sensing an oxygen concentration in an exhaust gas of an internal combustion engine Method for controlling an oxygen concentration sensor for sensing an oxygen concentration in an exhaust gas of an internal combustion engine, which sensor includes an oxygen pump element and a heater element, comprises steps for controlling a pump current... | 01/26/1988 |
| 4707241 | Air/fuel ratio control system including means to well time start of feedback The invention relates to a control system for feedback control of the air/fuel ratio in an internal combustion engine by using a solid electrolyte oxygen sensor to sense oxygen in the exhaust gas. The oxygen sensor is of the type having an oxygen concentr... | 11/17/1987 |
| 4706637 | Oxygen concentration sensing device for an air-fuel ratio control system of an automotive internal combustion engine An oxygen concentration sensing device for use in an air-fuel ratio control system of an internal combustion engine includes a pair of solid electrolyte members having oxygen ion permeability which are disposed in the exhaust gas of the engine and arrange... | 11/17/1987 |
| 4698209 | Device for sensing an oxygen concentration in gaseous body with a source of pump current for an oxygen pump element An oxygen concentration sensing device for sensing an oxygen concentration in a gaseous body includes a pair of solid electrolyte members having oxygen ion permeability which are arranged to face each other forming a predetermined gap portion between them... | 10/06/1987 |
| 4665874 | Device for sensing an oxygen concentration in gaseous body with a pump current supply circuit and an air/fuel ratio control system using an oxygen concentration sensing device An oxygen concentration sensing device and an air/fuel ratio control system for an internal combustion engine which include a pair of solid electrolyte members having oxygen ion permeability which are arranged to face each other to form a restricted regio... | 05/19/1987 |
| 4663717 | Fuel control system having sensor verification dual modes In a fuel control system for an internal combustion engine, high and low voltages are applied in succession to an oxygen sensor, the difference between currents generated successively by the sensor in response to the application of the voltages being dete... | 05/05/1987 |
| 4658790 | Air/fuel ratio detecting device and control system using same In order for increased precision control of air/fuel ratio, a pump electric current indicative voltage and a pump electric voltage are selectively used as an air/fuel ratio indicative signal in such a manner that the pump electric voltage is used at the s... | 04/21/1987 |
| 4622125 | Oxygen concentration control system An oxygen concentration control system comprising an electrolyte of the oxygen-ionconduction type exposed on its one surface to the interior of a chamber conducting gases under measurement through a diffusion resistance member, and the system controls the... | 11/11/1986 |
| 4615787 | Air/fuel ratio detector An air/fuel ratio detector providing an unambiguous output for both fuel-rich and fuel-lean regions is disclosed. The detector includes a solid-electrolyte oxygen-concentration-difference-actuated electrochemical cell sensor element and a solid-electrolyt... | 10/07/1986 |
| 4601809 | Oxygen concentration detecting system using oxygen sensor including oxygen ion pump A system for detecting the concentration of oxygen in a gas which comprises an oxygen sensor having a first solid electrolyte cell, which produces an electrical output representing a difference between oxygen partial pressures on the opposite two sides of... | 07/22/1986 |
| 4598682 | Method of controlling air-fuel ratio of an engine A method of controlling air-fuel ratio of an internal combustion engine is disclosed. An oxygen sensor is mounted to the engine to detect oxygen concentration in the exhaust gas from the engine and generate a voltage signal therefrom. The air-fuel is a co... | 07/08/1986 |
| 4586476 | Air-to-fuel ratio detector for engines An air-to-fuel ratio detector for detecting the air-to-fuel ratio of the combustible mixture supplied to an engine on the basis of the concentration of oxygen gas in the exhaust gas of the engine, comprising an air-to-fuel ratio sensor provided to detect ... | 05/06/1986 |
