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WO/2002/008594A1 |
The invention relates to a method for operating a catalyst (12) that is disposed in the exhaust gas of an internal combustion engine (1). The composition of the exhaust gas is influenced upstream of the catalyst (12) by adding a reducing...
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WO/2002/006654A1 |
The invention relates to a method for adapting a required catalyst temperature range for a NO¿x? storage catalyst (18) which is arranged in the exhaust gas flow of a combustion engine and which is supplied by a lean exhaust gas, wherein...
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WO/2002/004792A1 |
In a known circuit arrangement, a compensation circuit (KS) is provided between the output of the differential amplifier (Diff_Amp) and the input of the controller (R). Said compensation circuit generates a compensation signal, whose cha...
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WO/2001/091890A1 |
An OBD system is provided for monitoring an ozone depletion system that includes a catalyst coating containing MnO¿2? applied to a heat exchange surface on a moving vehicle over which atmospheric air passes. A physical characteristic of...
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WO/2001/092697A1 |
The invention relates to a device and a method for determining the pollutant concentration of an exhaust gas at a first point (5) of an exhaust-gas system in an internal combustion engine (2). According to said method, a sensor (4) for d...
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WO/2001/086273A1 |
The invention relates to a gas sensor (10) which comprises a metallic housing (12) and which, by means of a hollow screw (50), is fixed inside a measuring opening (56) containing a gas to be analyzed, whereby the housing (12) comprises a...
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WO/2001/086124A1 |
A method of controlling the concentration of nitrogen oxides (NOx), hydrocarbons (HC) and carbon monoxide (CO) in waste gases, such as burner fumes and the exhaust gases of internal combustion engines, wherein the method comprises passin...
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WO/2001/083088A1 |
The invention relates to a device for reduction of a gas component in an exhaust gas flow of a combustion engine (1) which is adapted for operation by a lean air/fuel mixture, comprising an exhaust pipe (21) for transport of said exhaust...
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WO/2001/077503A1 |
According to the inventive method for diagnosing an exhaust gas cleaning system of a lambda-controlled internal combustion engine (1), the catalyst (6) is subjected to a specific oxygen load which is greater than the normal operating loa...
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WO/2001/063110A1 |
A controller (6) computes the oxygen storage amount of the catalyst (3) separately as a high-speed component and a low speed component in accordance with actual characteristic. A target air-fuel ratio of an engine (1) is computed so that...
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WO/2001/063109A2 |
A controller (6) computes an oxygen storage amount of a catalyst (3) separately as a high speed component/amount and a low speed component/amount according to predetermined release/adsorption characteristics. A target air-fuel ratio of a...
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WO/2001/063105A2 |
A microprocessor (6) computes an oxygen storage amount of a catalyst (3) separately for a high speed component and a low speed component in accordance with real characteristic. A target air-fuel ratio of an engine (1) is computed and air...
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WO/2001/061174A1 |
A front A/F sensor (4) which detects an air-fuel ratio of exhaust flowing into a first three-way catalyst (3a), a first rear O2 sensor (5a) which detects an oxygen concentration of exhaust flowing out of the first three-way catalyst, a s...
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WO/2001/061165A1 |
An engine exhaust emission control arrangement has a catalytic converter including a three-way catalyst. Two oxygen sensors detect the oxygen concentration of exhaust gas upstream and downstream of the catalyst. A microprocessor calculat...
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WO/2001/057369A2 |
A controller (6) controls an air-fuel ratio of an engine (1) so that an oxygen storage amount of a catalyst (3) provided in an exhaust passage (2) is maintained constant. At this time, the controller (6) computes or estimates the oxygen ...
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WO/2001/055566A1 |
The invention relates to a method for detecting a NO¿x? storage capacity of a NO¿x? storage catalyst by means of a NO¿x?-sensitive measuring device which is arranged downstream in relation to the NO¿x? storage catalyst that is arrang...
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WO/2001/053672A1 |
The invention relates to a method for the diagnosis of an NO¿x? storage catalyst (1), which is arranged in the exhaust system of an internal combustion engine (3) and may be operated in an absorption and a regeneration mode, dependent u...
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WO/2001/052986A1 |
The invention relates to a method for aging inorganic work pieces by heat-treating them at a temperature in the range of from 1000 to 1350 °C and a pressure in the range of from 10?-7¿ to 10?-2¿ mbar for a period of 1 to 60 hours.
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WO/2001/051792A1 |
The invention relates to a device and a method for controlling a rate of recirculated exhaust gas (AGR rate) of an exhaust gas recirculation device (AGR device) for combustion engines during lean operation. A correcting variable is prede...
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WO/2001/049994A1 |
The invention relates to an internal combustion engine (1), in particular for a motor vehicle, which is provided with a storage catalyst (12'). Said storage catalyst can be fed with and can discharge nitrous oxides. A temperature sensor ...
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WO/2001/049988A1 |
The invention relates to an internal combustion engine, in particular, for a motor vehicle. The internal combustion engine is provided with an accumulator-type catalytic converter into/from which nitrogen oxides can be charged/discharged...
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WO/2001/049989A1 |
The invention relates to an internal combustion engine (1), especially for a motor vehicle, that is provided with a catalyst (12) that can be operated with hydrocarbons. The inventive engine further comprises a temperature sensor (13) fo...
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WO/2001/049991A1 |
The invention relates to an internal combustion engine (1), especially for a motor vehicle, that is provided with a three-way catalyst (12) that can be impinged upon with nitrogen oxides. The control device (18) is used to switch from a ...
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WO/2001/049990A1 |
The invention relates to an internal combustion engine (1), especially for a motor vehicle, that is provided with a three-way catalyst (12'') and a storage catalyst (12') that can be charged with and discharged from nitrogen oxides. The ...
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WO/2001/049983A2 |
An internal combustion engine (1), in particular, for a motor vehicle, is disclosed, comprising a catalyst (12), which can be treated with nitrogen oxides. A lambda probe (13) is provided, for the measurement of oxygen concentration afte...
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WO/2001/049987A1 |
The invention relates to an internal combustion engine (1), in particular, for a motor vehicle, in which, in a first operational mode, fuel can be directly injected into a combustion chamber (4) during an induction phase and, in a second...
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WO/2001/049995A1 |
An internal combustion engine (1), in particular, for a motor vehicle, is disclosed, comprising a catalyst (12), which may be charged with and discharged of nitrogen oxides. A NOx-Sensor (14) is provided with which the NOx emissions post...
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WO/2001/049992A1 |
The invention relates to an internal combustion engine, especially for a motor vehicle that is provided with a storage catalyst that can be charged with and discharged from nitrogen oxides. A plurality of aging characteristics (points 13...
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WO/2001/049993A1 |
The invention relates to an internal combustion engine, in particular for a motor vehicle, which is provided with a catalytic converter upon which hydrocarbons can impinge. The conversion capacity of the catalytic converter can be determ...
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WO/2001/046569A1 |
An air-fuel ratio controller for internal combustion engines capable of properly rating the deteriorated conditions of a catalyst device while ensuring a required purifying performance of the catalyst device provided in an exhaust passag...
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WO/2001/044629A2 |
The invention relates to a method and a device for exhaust gas and catalyst temperature determination in an exhaust system of an internal combustion engine in a motor vehicle. Said exhaust system comprises an exhaust pipe, with at least ...
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WO/2001/038704A1 |
An emissions diagnostic system (10) is used with a compression ignition engine having an exhaust gas stream (36) directed into an SCR catalyst (60) capable of reducing NO¿x? in the exhaust gas stream (36). The system (10) comprises a ta...
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WO/2001/034960A2 |
The aim of the invention is to provide a method for monitoring an exhaust catalyst (17) while the internal combustion engine (10) is still warm from operation. To this end, an NOx sensor (19) is inserted downstream of the exhaust catalys...
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WO/2001/033052A1 |
The invention relates to a method for monitoring a secondary air system associated with the exhaust system of a vehicle, comprising determination of a signal for the secondary air flow from a signal for the intake air flow (Masse¿Ansaug...
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WO/2001/033059A1 |
An internal combustion engine (1), in particular for a vehicle, is disclosed, which comprises a combustion chamber (4), into which fuel may be injected during a compression phase in one operating variant, or during an inlet phase in anot...
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WO/2001/027447A1 |
The invention relates to a diagnostic method for an exhaust system of a combustion engine (1) for removing the residues of the particles emitted by the engine (1), said exhaust system comprising a particle filter (6) and controlled means...
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WO/2001/023875A2 |
The invention relates to a method for diagnosing the level of deterioration of an NO¿x? catalyst located in the exhaust channel of an internal combustion engine. The NO¿x? concentration in the exhaust gas is detected by an NO¿x? senso...
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WO/2001/021942A1 |
The invention concerns a method for monitoring the operating conditions of at least two catalytic converters of a heat engine operating in lean burn, characterised in that it consists in: assessing the efficacy of hydrocarbon treatment b...
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WO/2001/021951A1 |
The invention relates to a method for monitoring the functioning of an NO¿x? sensor (18) which is arranged in an exhaust gas channel of an internal combustion engine and which is located downstream from an NO¿x? storage catalytic conve...
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WO/2001/019499A1 |
The aim of the invention is to operate an NOx catalyst in the exhaust-gas section of an internal combustion engine. To this end, the real efficiency (NOx2/NOx1) is detected and compared to a desired efficiency (H_S) that is dependent upo...
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WO/2001/018367A1 |
The invention relates to an internal combustion engine (1) in particular the internal combustion engine of a motor vehicle, which is provided with a combustion chamber (4), wherein fuel can be injected in a rich and in a lean operational...
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WO/2001/006223A1 |
The invention relates to a method for detecting the state of a catalytic converter system, whereby the catalytic converter system is arranged in an exhaust gas channel of an internal combustion engine of a motor vehicle, and an exhaust g...
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WO/2001/004471A1 |
The invention concerns a method for verifying a three-way catalytic converter (17) which consists in using a NOx sensor (19) to determine the NOx concentration downstream of the catalytic converter to be tested. From the measured NOx con...
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WO/2001/000972A1 |
The invention relates to a method for controlling an operating mode of an internal combustion engine. Elements are allocated to the internal combustion engine which at least temporarily influence at least one operating parameter of the i...
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WO/2000/076636A1 |
The invention relates to a method of determining the NOx concentration of a flow of exhaust gases of an internal combustion engine by means of an NOx sensor that has been calibrated by selected operating points. Said NOx sensor is locate...
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WO/2000/077355A1 |
The invention relates to a method for detecting deterioration of at least one NO¿x? storage catalyst arranged in the exhaust line of an internal combustion engine, whereby at least one exhaust gas constituent is detected by a gas sensor...
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WO/2000/077372A1 |
The invention relates to a method for initiating and monitoring a desulfurization of at least one NO¿x? storage-type catalytic converter arranged in an exhaust channel of an internal combustion engine, whereby an NO¿x? concentration of...
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WO/2000/071870A1 |
The invention relates to a method for controlling a rich/lean combustion mixture, using an electrochemical gas sensor. The method enables the operation of an NO¿x? storage catalyst which accumulates surplus NO¿x? in the exhaust gas, du...
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WO/2000/053905A1 |
The invention relates to a method for monitoring the function of catalysts in internal combustion engines according to which similar operational states (bz) are determined on the basis of operational parameters of the internal combustion...
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WO/2000/029729A1 |
The invention relates to a method for monitoring a NO¿x? storage catalytic converter (14) positioned downstream of an internal combustion engine (12) run on a lean mixture. According to said method the NO¿x? storage efficiency of the c...
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