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| Number | Title | Issue Date |
| 8079351 | Temperature sensor diagnostics A system for an internal combustion engine of a vehicle is disclosed. In one example, characteristics of an oxygen sensor are a basis for determining degradation of a temperature sensor. In this way, the system can provide redundant exhaust gas temperature sensing. | 12/20/2011 |
| 7900616 | Exhaust gas oxygen sensor monitoring An internal combustion engine includes an exhaust system, an oxygen sensor in the exhaust system and a sensor malfunction monitor. The sensor malfunction monitor measures a rate of change of a signal from the sensor on detecting a turning point of the signal and det... | 03/08/2011 |
| 7874285 | Method and device for monitoring an exhaust gas probe Depending on a trim controller diagnosis, a suspicion marker for an asymmetric ageing of the exhaust gas probe is allocated either a “true” value or a “false” value and, if the value of the suspicion marker is “true”, a dynamic diagnosis will be performe... | 01/25/2011 |
| 7614392 | Diagnostic method and control apparatus for gas sensor A gas sensor diagnostic method includes: a fuel supply detecting step of detecting an interruption of a fuel supply to the internal combustion engine, and a restart of the fuel supply after the interruption of the fuel supply; a response time period accumulating ste... | 11/10/2009 |
| 7421836 | Air/fuel ratio validation for lean burn A multi-cylinder group engine system operable in at least a first mode and a second mode, where in the first mode a first and second cylinder group combust air and fuel, and where in the second mode at least one of the first and second cylinder group combusts air an... | 09/09/2008 |
| 7412820 | Air-fuel ratio control system for internal combustion engine An air-fuel ratio control system for an internal combustion engine having a catalyst provided in an exhaust system of the engine for purifying exhaust gases and a first oxygen concentration sensor disposed upstream of the catalyst is disclosed. The air-fuel ratio co... | 08/19/2008 |
| 7389637 | Diagnostic equipment for an exhaust gas cleaning apparatus A diagnostic equipment for an exhaust gas cleaning apparatus installed for an engine, comprising a misfire detector which detects the misfire of the engine, and a secondary-air-system failure detector which detects the failure of a secondary air system. An index cor... | 06/24/2008 |
| 7387011 | Deterioration diagnosis system for exhaust gas sensor A diagnosis device calculates a lean-direction responsiveness characteristic and a rich-direction responsiveness characteristic of the exhaust gas sensor. The lean-direction responsiveness represents a responsiveness of the sensor in a case that an air-fuel ratio is... | 06/17/2008 |
| 7369932 | System and method for turbine engine fault detection using discrete event system modeling A system and method is provided for fault detection in a turbine engine. The fault detection system and method uses discrete event system modeling to provide improved fault diagnosis and prognosis. The fault detection system and method receives sensor taken at multi... | 05/06/2008 |
| 7340945 | Failure detection apparatus and failure detection method for exhaust gas sensor An air-fuel ratio sensor has an exhaust-side electrode and an atmosphere-side electrode. The atmosphere-side electrode is disposed in an atmosphere layer that communicates with the atmosphere. Since the air-fuel ratio sensor is disposed in an exhaust passage, exhaus... | 03/11/2008 |
| 7311093 | Element crack detecting apparatus and method for oxygen sensor An element crack detecting apparatus for an oxygen sensor detects a sensor output voltage for an abnormality detection period after a fuel cut-off is started during operation of an engine. When the output voltage becomes negative, an abnormality counter is counted u... | 12/25/2007 |
| 7302942 | Method and device for operating an internal combustion engine A method and a device for operating an internal combustion engine make it possible to monitor a temperature sensor or a lambda sensor in an exhaust system of the internal combustion engine for functionality in the entire operating range of the internal combustion en... | 12/04/2007 |
| 7293557 | Abnormality detecting apparatus and abnormality detecting method for an air/fuel ratio sensor An abnormality detecting apparatus includes an air/fuel ratio sensor that detects an air/fuel ratio within a range including the stoichiometric air/fuel ratio, an admittance detector for detecting an admittance of the sensor, and a temperature detector for detecting... | 11/13/2007 |
| 7286926 | Apparatus and method for detecting deterioration of exhaust gas sensor A deterioration detecting apparatus for an exhaust gas sensor of an internal combustion engine, the exhaust gas sensor including a sensor element and a heater that heats the sensor element, computes a first sensor characteristic parameter, which is related to a char... | 10/23/2007 |
| 7278394 | Air-fuel-ratio control apparatus for internal combustion engine The air-fuel-ratio control apparatus for an internal combustion engine obtains an upstream-side feedback correction value DFi for feedback-controlling an air-fuel ratio on the basis of a value (Fcrlow(k−N)) that is obtained by performing a low-pass filter process ... | 10/09/2007 |
| 7278405 | Fuel injection system designed to ensure enhanced reliability of diagnosis of valve A fuel injection system for automotive diesel engine is provided which is equipped with a fuel pressure sensor working to measure the pressure of fuel in an accumulator and a pressure-reducing valve working to drain the fuel from the accumulator. The system is desig... | 10/09/2007 |
| 7278414 | Diagnostic tool for sensing oxygen sensor heater operation A diagnostic testing system for a vehicle comprising an oxygen sensor having a heating element for heating the oxygen sensor to its minimum operational temperature, an analyzer having a user interface, a communications link between the analyzer and the vehicle to ob... | 10/09/2007 |
| 7275364 | Exhaust emission control device of internal combustion engine The air/fuel ratio of exhaust flowing into a catalytic converter is forcibly modulated, between a lean air/fuel ratio leaner than a target average air/fuel ratio and a rich air/fuel ratio richer than the target average air/fuel ratio, with a specific period, a speci... | 10/02/2007 |
| 7269993 | Gas detecting apparatus, gas detecting method and fuel cell vehicle The gas detecting system of the present invention is equipped with a catalytic combustion type gas sensor 1a and a semiconductor type gas sensor 1b, in a gas detecting system 1 having an operating sate in which generation of electr... | 09/18/2007 |
| 7266440 | Air/fuel ratio control system for automotive vehicle using feedback control An simplified structure of an air-fuel ratio control system for an internal combustion engine includes an upstream and a downstream catalytic device installed in an exhaust pipe of the engine and a first, a second, and a third air-fuel ratio sensor installed in upst... | 09/04/2007 |
| 7254474 | Diagnosis apparatus for internal combustion engine In a diagnosis apparatus for an internal combustion engine which determines the abnormality of a linear A/F sensor which is disposed on the upstream side of a catalyst of the engine and detects the A/F of exhaust gas, the apparatus includes a response/gain deteriora... | 08/07/2007 |
| 7248960 | Air-fuel ratio sensor monitor, air-fuel ratio detector, and air-fuel ratio control An air-fuel ratio sensor monitor is provided which is designed to monitor reactive characteristics or response rates of an air-fuel ratio sensor when an air-fuel ratio of a mixture to an internal combustion engine is changing to a rich side and to a lean side. The m... | 07/24/2007 |
| 7230210 | Method for controlling the operation of a probe The invention concerns a method for controlling the operating conditions of a probe (11) associated with means purifying (7) exhaust gases of an internal combustion engine (2), which consists in comparing an output signal of the probe with a ref... | 06/12/2007 |
| 7228249 | Methods and apparatus for determining the condition of a sensor and identifying the failure thereof Methods and apparatus are provided which generate an error signal if a sensor is either anticipated to fail or fails. At least two sensors provide input signals having magnitudes that approximately correspond to a sensed event. A processor calculates an actual corre... | 06/05/2007 |
| 7225800 | Engine controller The invention provides an engine controller, which can determine a deterioration mode (gain deterioration or response deterioration) of an air/fuel (A/F) ratio sensor, can detect a degree of the deterioration with high accuracy, and can optimize A/F ratio feedback c... | 06/05/2007 |
| 7225801 | Default mode for lean burn engine A multi-cylinder group engine system operable in at least a first mode and a second mode, where in the first mode a first and second cylinder group combust air and fuel with a lean air-fuel ratio, and where in the second mode at least one of the first and second cyl... | 06/05/2007 |
| 7223946 | Method and device for control and diagnosis for the heating of a lambda probe A method for controlling and regulating an electrical heating of a probe situated in the exhaust system of an internal combustion engine, a total heating power of the probe being set, and an actual temperature value of the probe being determined by measuring a chara... | 05/29/2007 |
| 7216639 | Abnormality diagnosis device for air-fuel ratio sensor When carrying out abnormality determination for an air-fuel ratio sensor 33 by comparison of an average value tave of all diagnostic values t(n) and an abnormality determination value C, the abnormality determination value C is corrected using an average valu... | 05/15/2007 |
| 7206210 | Power supply control loop with multiple leveling modes A method and apparatus for controlling a power supply. The system includes a power supply and a controller for outputting a command signal to regulate the operation of the power supply. The controller determines the command signal based on at least one error signal ... | 04/17/2007 |
| 7201160 | Air-fuel ratio sensor monitor, air-fuel ratio detector, and air-fuel ratio control An air-fuel ratio sensor monitor is provided which is designed to monitor reactive characteristics or response rates of an air-fuel ratio sensor when an air-fuel ratio of a mixture to an internal combustion engine is changing to a rich side and to a lean side. The m... | 04/10/2007 |
| 7193521 | Method and apparatus for detecting errors, fluid pressure, and occlusions in an ambulatory infusion pump An improved pump, reservoir and reservoir piston are provided for controlled delivery of fluids. A motor is operably coupled to a drive member, such as a drive screw, which is adapted to advance a plunger slide in response to operation of the motor. The plunger slid... | 03/20/2007 |
| 7181331 | Engine air-fuel ratio control system An engine air-fuel ratio control system is configured to use a rich air-fuel ratio immediately after starting an engine such that the air-fuel ratio converge rapidly toward a stoichiometric value and then afterwards start an air-fuel ratio feedback control. Upon det... | 02/20/2007 |
| 7146972 | Exhaust gas sensor activation judgment and air fuel ratio control system/method An air fuel ratio control system includes an exhaust gas sensor to sense an oxygen concentration in an exhaust passage of an internal combustion engine, and a controller. The controller is configured to judge that the exhaust gas sensor is in an active state, by mon... | 12/12/2006 |
| 7142976 | Abnormality diagnosis method and apparatus for gas concentration measuring device An abnormality diagnosis method for a gas concentration measuring device, includes electrically shutting off measurement means from an oxygen concentration detecting cell and an oxygen pump cell of a gas sensor when a voltage at one of electrical connection points t... | 11/28/2006 |
| 7134429 | Method and device for controlling an internal combustion engine A device and a method for controlling an internal combustion engine in which, starting from the comparison between a measured and an expected value for a lambda signal, a correction value is specified for a fuel signal characterizing the fuel quantity, or an air sig... | 11/14/2006 |
| 7131266 | Secondary air supply control apparatus for internal combustion engine When a specified air-fuel ratio F/B control condition is established during supply of a secondary air provided, an air-fuel ratio F/B control is executed, and at this time, an initial value of a target air-fuel ratio is set to a before-catalyst air-fuel ratio detect... | 11/07/2006 |
| 7127344 | Engine air-fuel ratio control system An engine air-fuel ratio control system is configured to use a rich air-fuel ratio immediately after starting an engine such that the air-fuel ratio converge rapidly toward a stoichiometric value and then afterwards start an air-fuel ratio feedback control. Upon det... | 10/24/2006 |
| 7117664 | Diagnostic equipment for an exhaust gas cleaning apparatus A diagnostic equipment for an exhaust gas cleaning apparatus installed for an engine, comprising a misfire detector which detects the misfire of the engine, and a secondary-air-system failure detector which detects the failure of a secondary air system. An index cor... | 10/10/2006 |
| 7117099 | Wide band lambda probe having improved starting behaviour In a method and a control device for operating a broadband lambda sensor, the oxygen concentration of an exhaust gas is determined based on a comparison of a Nernst voltage with a reference voltage having a nominal value; a pump current is injected into a cavity of ... | 10/03/2006 |
| 7103467 | Device for detecting response characteristics of sensor When the output of the AFR ratio sensor is stable in a steady operating state, the amount of fuel is increased by step inputting to detect a point where the gradient of change in the sensor output exceeds a threshold value as a point of start of change. The time fro... | 09/05/2006 |
