Entries |
Document | Title | Date |
20080276698 | APPARATUS FOR DIAGNOSING MALFUNCTIONING OF OXYGEN SENSOR - An apparatus for diagnosing malfunctioning which is applied to an internal combustion engine having a catalyst, an air-fuel ratio sensor, and an oxygen sensor is disclosed. The apparatus diagnoses whether the oxygen sensor is malfunctioning on the basis of a change in an output value of the oxygen sensor within a predetermined period of time after the output value has started changing towards a lean side after the start of fuel cutoff. The apparatus is provided with a first determination section and a second determination section. The first determination section determines whether fresh air has reached the air-fuel ratio sensor after the start of the fuel cutoff. The second determination section determines whether or not to carry out diagnosis of malfunctioning on the basis of the output value of the oxygen sensor immediately after the first determination section has determined that fresh air has reached the air-fuel ratio sensor. | 11-13-2008 |
20080314133 | Method for Monitoring an Exhaust Gas Purifying Component - In a method for monitoring an exhaust gas purifying component with gas storage capability for purifying exhaust gases from an internal combustion engine, the exhaust gas purifying component comprises a gas storage material which changes from a first state into a second state upon storage of the gas. A temperature change of the exhaust gas purifying component and/or of the gas storage material, substantially based on a heat tonality of the modification transition, is measured and evaluated. | 12-25-2008 |
20090133483 | METHOD AND DEVICE FOR ESTIMATING THE TEMPERATURE OF EXHAUST GASES ENTERING INTO A POST-TREATMENT SYSTEM ARRANGED DOWNSTREAM FROM A SYSTEM FOR THE TREATMENT OF SAID GASES - A method and device for estimating temperature of gases arising from internal combustion of an engine at the entrance to a system for post-treatment of the gases. The post-treatment system is downstream from a system for treatment of the gases, which may include a nitrogen oxide NO | 05-28-2009 |
20090139318 | SYSTEMS AND METHODS FOR MONITORING THE QUALITY OF A REDUCING AGENT - This patent disclosure relates to monitoring the quality of a reducing agent used in an emission-control system. Because emission-control systems may be used in extreme temperatures, the reducing agent used in these systems may be exposed to extreme temperatures for prolonged periods. This exposure may cause premature degradation of the reducing agent, thereby reducing the effectiveness of the emission-control system. To monitor the quality of the reducing agent, the disclosed systems and methods measure a property of the reducing agent, determine whether the measured property is out of compliance with a predetermined range, and provide a warning signal when the measured property is out of compliance. | 06-04-2009 |
20100005871 | Clogging Determining Device For Reducing Agent Injection Valve and Clogging Determining Method For Reducing Agent Injection Valve - Provided is a clogging determining device and a clogging determining method for a reducing agent injection valve, which enable clogging of the reducing agent injection valve to be determined with high precision in further consideration of the individual difference of the system. There are provided an opened-valve pressure reduction amount calculating element for calculating an opened-valve pressure reduction amount representing a pressure reduction amount in the supply passage which is reduced in a predetermined time when the pressure-feeding operation of the pump is stopped under the state that the reducing agent injection valve is set to an injection mode, a closed-valve pressure reduction amount calculating element for calculating a closed-valve pressure reduction amount representing the pressure reduction amount in the supply passage which is reduced in a predetermined time when the pressure-feeding operation of the pump is stopped under the state that the reducing agent injection valve is set to a full-close mode; and a clogging determining element for comparing the opened-valve pressure reduction amount with the closed-valve pressure reduction amount to determine clogging of the reducing agent injection valve. | 01-14-2010 |
20100107748 | PROCEDURE FOR CHECKING THE FUNTIONALITY OF A PUMP - A procedure for checking the functionality of a reducing agent pump ( | 05-06-2010 |
20100242584 | METHOD FOR OPERATING A SENSOR - A method for operating a sensor in an exhaust gas tract of an internal combustion engine and a device for carrying out the method are provided. In the method, a diagnosis is carried out of the condition of the saturation temperature, exclusively while taking into consideration a few fundamental input variables characterizing the operating state of the internal combustion engine. | 09-30-2010 |
20120222474 | METHOD AND DEVICE FOR DYNAMICALLY DIAGNOSING AN EXHAUST GAS PROBE - A method for dynamically diagnosing an exhaust gas probe. A target/actual comparison is performed between a calculated O2 signal and an O2 signal measured with the exhaust gas probe, for a step load transition. A device for dynamically diagnosing an exhaust gas probe disposed in an exhaust duct of an internal combustion engine. An output signal is fed to an engine controller connected to additional input signals providing information about intake air mass and fuel metering. The engine controller comprises devices for determining a calculated O2 signal from the information about the input air mass and the fuel metering and devices for filtering and/or gradient forming and/or integrating the calculated O2 signal and an O2 signal measured by the exhaust probe. A target/actual comparison between the calculated O2 signal and the measured O2 signal, can be performed for a step load transition. | 09-06-2012 |
20120318055 | DPF FAILURE DETECTION METHOD AND DPF FAILURE DETECTION DEVICE - The present invention provides a DPF failure detection method and a DPF failure detection device, which can be realized with a simple configuration and detect a failure at low cost. The theoretical deposited amount of PM on a DPF | 12-20-2012 |
20130199282 | MEASUREMENT OF DIESEL ENGINE EMISSIONS - An emissions output of an engine, such as a diesel generator, may be determined from the load on the engine and an exhaust volume from the engine. Chemicals such as nitrogen oxide (NO | 08-08-2013 |
20130269427 | DPF SYSTEM - A diesel particulate filter (“DPF”) system is provided with temperature sensors at an entrance side and an exit side of a diesel oxidation catalyst, an SV ratio determining device that determines an exhaust gas SV ratio by measuring flow rate of exhaust gas during the DPF forcible regeneration, and an injector diagnosing device including a heat-generation region determining unit to which detection values of the temperature sensors and a determination value of the SV ratio determining device are input to determine whether or not these values are within a theoretical heat-generation region, and an actual injection amount diagnosing unit that diagnoses a decrease amount in an actual injection amount of an exhaust pipe injector, when the detection values of the temperature sensors and the determination value of the SV ratio determining device are within the theoretical heat-generation region. | 10-17-2013 |
20130319098 | TEST EQUIPMENT MANIFOLD INTERFACE - A test equipment manifold interface for automated test equipment (ATE) for testing electronic circuits by both Device Under Test Thermal Management (DTM) and non-DTM testing. The manifold interface has a housing, with an air inlet aperture, outlet apertures, and a chamber. The chamber has a chamber inlet provided by the air inlet aperture and a chamber outlet coupled to the outlet apertures. A hollow piston is captive in the chamber. The piston has DTM interface inlet and outlet apertures. In operation, when a DTM load board manifold engages the manifold interface, the hollow piston directs air to flow from the air inlet aperture to the DTM interface outlet aperture. When the DTM load board manifold disengages the manifold interface, the hollow piston directs air to flow from the air inlet to the outlet apertures via the chamber outlet. | 12-05-2013 |
20140174167 | EXHAUST SENSOR FOR AN INTERNAL COMBUSTION ENGINE - The present invention relates to an exhaust sensor ( | 06-26-2014 |
20140230532 | REAL-TIME SOOT MEASUREMENT IN A DIESEL PARTICULATE FILTER - Methods and apparatus for detecting the filtering state of a filter, such as a particulate filter. Some embodiments include one or more capacitive sensors that provide a signal corresponding to the filtered state of the filter with a change in measured capacitance. A novel ECT based sensing technique for soot load estimation in a diesel particulate filter is presented. The sensing technology is based on principle that deposited soot thickness inside DPF causes a variation in the dielectric constant which has a direct impact on the capacitance of ECT system and its output voltage. The sensor can be built into the DPF outer shell as indicated in the design. The simulation results demonstrate that there is a direct relationship between the amount of soot load in the DPF and the output voltage of the ECT system which can be used to estimate the soot load. | 08-21-2014 |
20150020582 | SYSTEM FOR TAKING EXHAUST GAS SAMPLES FROM INTERNAL COMBUSTION ENGINES - A system for taking exhaust gas samples from internal combustion engines includes an exhaust gas duct comprising an outflow cross section and an exhaust gas inlet. The exhaust gas duct communicates with an exhaust gas source via the exhaust gas inlet. An air duct takes in ambient air via a filter. The outflow cross section is concentric in the air duct. A mixing zone is arranged downstream of the outflow cross section. A dilution tunnel has an exhaust gas/air mixture flow therethrough. An annular orifice is arranged downstream of the outflow cross section in the dilution tunnel. A flow deflection device is arranged upstream of the annular orifice and downstream of the outflow cross section. The flow deflection device deflects the exhaust gas/air mixture so that it departs from a center axis of the dilution tunnel immediately downstream of the flow deflection device in an axially symmetrical manner. | 01-22-2015 |
20150114101 | DEPOSIT DETECTION DEVICE FOR EXHAUST PUMP AND EXHAUST PUMP - A deposit detection device for an exhaust pump is provided, which can be easily put into operation without the burdens of, for example, installing equipment for flowing a gas, or adding or changing operation modes in apparatuses. The device is configured to include: a means for detecting motor current values a motor that rotates a rotating body; a current value storage portion that stores only motor current values that are equal to or greater than a preset value from among detected motor current values; an average value calculation portion that calculates an average value per unit time of the stored motor current values; an average value storage portion that stores the calculated average value; an approximation calculation portion that determines a linear approximation of the stored chronologically ordered average values; and a difference value calculation portion that determines a difference value between a predicted motor current value calculated by using the linear approximation and an initial motor current value at a start of use of the exhaust pump. A time when the difference value exceeds a predetermined threshold is determined as a time for maintenance of the exhaust pump. | 04-30-2015 |
20150308859 | method for monitoring a rotation of a compressor wheel - In a method for monitoring a rotation of a compressor wheel of an exhaust-gas turbocharger, which compressor wheel has on the peripheral side a number n of blades, an inductive sensor is provided for detecting the speed or rotational frequency, which sensor produces at least one output signal as a function of eddy currents generated as the blades pass by, and the rotational speed of the compressor wheel is inferred from a fundamental frequency of the output signal. In addition, information about a fault of the compressor wheel is derived from at least one modulation of the output signal, e.g., amplitude modulation, and an imbalance of the compressor wheel is detected. | 10-29-2015 |
20150338311 | EMISSIONS MEASUREMENT EQUIPMENT AND METHOD - An emissions test apparatus is provided and may include a filter housing having at least one of a first RFID tag and a first bar code identifying the filter housing. A filter media may be selectively disposed within the filter housing and may include at least one of a second RFID tag and a second bar code identifying the filter media. A controller may link the filter housing and the filter media when the filter media is disposed within the filter housing based on information provided by the at least one of the first RFID tag and the first bar code and the at least one of the second RFID tag and the second bar code. | 11-26-2015 |
20160018291 | DUAL HEGO METHOD FOR IDENTIFICATION AND MITIGATION OF AIR-FUEL IMBALANCE FAULTS - Systems and methods for identifying and mitigating air-fuel imbalance faults specific to an engine cylinder are provided. In one embodiment, a method comprises indicating a cylinder imbalance by comparing time-aligned readings from exhaust gas oxygen sensors, the exhaust gas oxygen sensors positioned symmetrically opposite each other within an exhaust passage downstream of a catalyst. In this way, an air-fuel imbalance fault may be accurately detected in a non-uniform exhaust flow so that mitigating actions can be taken, resulting in reduced tailpipe emissions. | 01-21-2016 |
20160053655 | FAILURE DETECTION DEVICE FOR FUEL ADDITION VALVE - A controller recognizes that fuel is and is not actually injected when an amplitude of fuel pressure fluctuations detected by a pressure sensor is not less than and is less than a pressure threshold α, respectively, to obtain a number N of actual fuel injections and determines that a fuel addition valve operates normally and has malfunction when a ratio (N/S) of the obtained numbers N of the actual fuel injections to a number S of the fuel injection commands is not less than and is less than a number ratio threshold β, respectively. | 02-25-2016 |