Abstract: A malfunction diagnosis apparatus diagnoses a malfunction of an exhaust gas sensor provided on a downstream side of a catalyst. A dead time determination unit determines a dead time between a first time point, at which fuel cut of the internal combustion engine is started, and a second time point, at which the fuel cut starts exerting effect on an output of the exhaust gas sensor. An output change time measurement unit measures an output change time between the first time point and a third time point, at which the output of the exhaust gas sensor changes to a leaner side than a threshold. A malfunction determination unit determines whether a malfunction is caused in the exhaust gas sensor on the basis of a response time of the exhaust gas sensor obtained by subtracting the dead time from the output change time.

Abstract: A Calibrated Air Intake Tract for Internal Combustion Engine is disclosed. The intake includes a Mass Airflow Sensor section that defines an inner diameter that differs from the diameter of the overall intake air tract piping. The Mass Airflow Sensor length and diameter are precision-tuned in order to provide the best engine performance without the typical “check engine” light being lit due to faulty mass airflow sensor readings. In those vehicles where necessary, an insert of the appropriate size and in the proper location is added to the interior wall of the MAFS section in order to correct final fuel trim level inadequacies.

Abstract: Exhaust-gas sensors that have a sensor element, which is surrounded by two protective tubes on a side facing the exhaust gas and which is additionally protected by a porous fiber package, are already known. The fiber package is disposed between the two protective tubes and is meant to protect the sensor element from thermal shock by water droplets hitting the sensor element. When the exhaust gas sensor is used as primary catalytic converter or raw emission sensor, the sensor element can get damaged by sulfur compounds contained in the exhaust gas. In the exhaust-gas sensor according to the invention, damage to the sensor element by exhaust-gas components contained in the exhaust gas is reliably prevented. According to the invention, the adsorption means is implemented in such a way that sulfur, phosphorus or silicon compounds are trapped irreversibly.

Abstract: An object of the present invention is to provide a technology that enables to detect a fault of a PM trapper with improved accuracy. According to the present invention, a plurality of temperature sensors 10 are provided in an exhaust passage 9 just downstream of a PM trapper 17 in such a way that their temperature detection elements are positioned on a plane that is perpendicular to an imaginary center axis of the exhaust passage 9. A change in the radial direction temperature distribution of the exhaust gas flowing out of the PM trapper 17 upon occurrence of a fault in the PM trapper 17 is detected from measurement values of the temperature sensors 10, and a fault of the PM trapper 17 is detected based on this radial direction temperature distribution. Since the measurement values of the temperature sensors 10 are unlikely to be affected by the amount of PM deposited on the PM trapper 17, detection of a fault of the PM trapper 17 can be achieved with improved accuracy.

Abstract: A vehicle exhaust measurement system is provided includes that a conduit having a conduit inlet and a conduit outlet. A make-up air tube is connected to and is in fluid communication with the conduit inlet. The make-up air tube provides make-up air for mixing an exhaust gas. A mixed gas tube is connected to and is in fluid communication with the conduit outlet. The mixed gas tube conveys a mixture of make-up air and exhaust gas to analysis equipment. In the preferred embodiment, the exhaust gas tube extends through an outer wall of the conduit. A mixing plate is arranged in either the conduit or the mixed gas tube with the exhaust gas tube extending to a position adjacent to the mixing plate. The exhaust gas tube conveys the exhaust gas to the mixing plate to mix the exhaust gas and the make-up air at the mixing plate.

Abstract: The invention relates to a method for determining a gas concentration in a measuring gas by means of a gas sensor. In a first mode of operation of an internal combustion engine, in which the gas concentration in the measuring gas is known, a gas concentration signal and a pressure signal are detected. A compensation parameter of the gas sensor is determined from said signals. The thus determined compensation parameter is taken into account in at least one of the two modes of operation of the internal combustion engine for determining the gas concentration.

Abstract: A system and method for improving sensor performance of an on-board vehicle sensor, such as an exhaust gas sensor, while sensing a predetermined substance in a fluid flowing through a pipe include a structure for extending into the pipe and having at least one inlet for receiving fluid flowing through the pipe and at least one outlet generally opposite the at least one inlet, wherein the structure redirects substantially all fluid flowing from the at least one inlet to the sensor to provide a representative sample of the fluid to the sensor before returning the fluid through the at least one outlet.

Abstract: A method to diagnose an exhaust gas sensor disposed in the exhaust gas region of an internal combustion engine, wherein provision is made for a comparison of a measurement for at least one exhaust gas component with a measurement of the exhaust gas component, which is ascertained on the basis of an exhaust gas sensor signal, and a device to implement the method are proposed. The diagnosis is only implemented if a change in at least one operating parameter of the internal combustion engine and/or at least one parameter of the exhaust gas is detected during the running operation of the internal combustion engine. Provision is made in the diagnosis for an averaging of the measurement for at least the one exhaust gas component as well as of the measurement for the exhaust gas component, which is provided by the exhaust gas sensor.

Abstract: A monitoring method and a monitoring arrangement, wherein: (a) first comparison value is established based on information from a sensor as to the measured magnitude of a parameter related to exhaust gases flowing out of an exhaust gas aftertreatment appliance included in an exhaust aftertreatment system; b) a second comparison value corresponding to the first comparison value is established based on a value representing the magnitude of said parameter calculated on the basis of a calculation model; c) a difference value representing the difference between said comparison values is established; d) steps a)-c) are repeated during a certain period of time and a variance value representing the variance of the difference value during this period of time is established; and e) the variance value is compared with a given threshold value for generation of information regarding the functioning of the sensor or the system.

Abstract: A diagnostic apparatus for an internal combustion engine is disclosed herein. In one embodiment, the diagnostic apparatus comprises a catalytic converter and a controller. The catalytic converter is disposed in an exhaust passage of an engine and treats an exhaust gas component in the exhaust gas. The controller is adapted to perform a number of functions. More specifically, the controller is adapted to operate the engine with an engine control parameter to increase catalyst temperature of the catalytic converter during a cold engine condition. The controller is further adapted to calculate a temperature factor indicative to temperature increase of the catalyst based on the engine control parameter. The controller is further adapted to estimate the amount of the exhaust gas component flowing out of the catalytic converter based on the temperature factor.

Abstract: The invention relates to an CO2 tracing method for measuring a raw exhaust gas (3) flow rate at exit from an internal combustion engine (1A) for a motor vehicle (1). The inventive CO2 tracing method for measuring raw exhaust gas flow rate at exit from an internal combustion engine for a motor vehicle consists, prior to starting the motor vehicle internal combustion engine, in injecting a known flow rate of a gas CO2 and N2 mixture into a metering line (20) in such a way that a raw CO2 analyser (22) and a diluted CO2 analyser (24) are triggered.

Abstract: A method to diagnose an exhaust gas sensor (16) disposed in an exhaust gas region (13) of an internal combustion engine (10), whereby a test is made at said sensor to determine whether a change of at least one exhaust gas component, which is detectable by the exhaust gas sensor (16), results in an expected change of the sensor signal (s_Mes), and a device for the implementation of the method are proposed. The diagnosis is only implemented if a specified change in at least one operating parameter (Md, n, agr) of the internal combustion engine (10) and/or at least one parameter (ms_Abg, NOx, ms_NOx) of the exhaust gas in the running operation of the internal combustion engine (10) are detected.