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WO/2000/025119A1 |
Disclosed is a resistive gas sensor that determines hydrocarbon in exhaust gases, comprising a semiconductor metal oxide perovskite structure of the general formula A¿1-x-z1? A'¿x? B¿1-y-z2? B'¿y? O¿3?, wherein x is between 0 and 0....
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WO/2000/023694A2 |
The invention relates to a method for reducing nitrogen oxide in the exhaust gases of an internal combustion engine operating with a lean mixture and having a downstream NO¿x? accumulation catalyst, wherein NO¿x? accumulation is favore...
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WO/2000/021881A1 |
A safe, reliable SCR system for reducing NO¿x? emissions from a lean-burn internal combustion engine utilizes urea in aqueous solution. A modular assembly is provided for mounting inside an urea reagent tank (30) which enables controlle...
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WO/2000/009870A1 |
The invention relates to a method according to which the temperature of the catalytic converter monolith is determined at the catalytic converter intake by means of a temperature model on the basis of modelled or measured exhaust-gas tem...
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WO/2000/004282A1 |
A behavior of an exhaust system (E) is implemented by modeling the exhaust system (E) containing a catalyst device (3), a first emission gas sensor (5) (air/fuel ratio sensor) on the upstream side of the catalyst device (3) and a second ...
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WO/2000/000728A1 |
In order to check the dynamic behavior of a measure sensor detecting substance concentration in the exhaust system of an internal combustion engine working with excess air downstream from an NOx accumulation catalytic converter, the sign...
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WO/1999/067511A1 |
A catalyst (22) suitable for reducing NO¿x? in an exhaust gas by using ammonia in the presence of an excessive oxygen is disposed in an exhaust passage (18, 21). A urea solution is supplied via a flow rate control valve (33) into the ex...
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WO/1999/061770A1 |
In order to check the efficiency of an NOx accumulation catalyst (3) mounted in the exhaust system of an internal combustion engine (1) operated with a lean mixture, the actual accumulation capacity of the NOx accumulation catalyst (3) i...
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WO/1999/058826A1 |
A calorimetric sensor system requires a vehicle's internal combustion engine (10) to cyclically operate between first and second conditions to repeatedly produce a varying exhaust gas composition which is consistent from cycle to cycle. ...
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WO/1999/047795A2 |
Method and device to monitor functioning of a catalyst (15) mounted in the exhaust gas section (3) of an internal combustion engine (1), enabling determination of the conversion rate as a function of the temperature of the catalyst (15) ...
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WO1999025965A9 |
An on-board monitoring system senses hydrocarbon emissions produced by the internal combustion engine of a vehicle through qualifying condition sensors detecting selected vehicle operating conditions and a hydrocarbon sensor sensing HC e...
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WO/1999/040298A1 |
An on-board catalytic monitoring system (10) uses an intrusive technique to cause the vehicle's engine (12) to cycle between first and second operating conditions. The first and second operating conditions are chosen such that different ...
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WO/1999/035387A1 |
In the monitoring of leaks in an exhaust treatment system (28) of an internal combustion engine (10) having a three-way catalytic converter (14) and a nitrogen oxide trap (16), an electronic engine control unit (12) and a device for fixi...
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WO/1999/035388A1 |
In a method of monitoring leaks in an exhaust treatment system of an internal combustion engine (10) having a three-way catalytic converter (14) with or without a nitrogen oxide trap (16) and an electronic engine control unit (12) with a...
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WO/1999/025966A1 |
An apparatus and method for processing signals obtained from a hydrocarbon gas sensor (216) adapted within automobile exhaust system (204) for determining operation of a catalytic converter (208) that is part of the exhaust system (204)....
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WO/1999/023371A1 |
In a first aspect of the present invention there is provided a method of monitoring efficiency of a catalytic converter (14) present in an exhaust system (12) of an internal combustion engine (10) which has a closed loop control system (...
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WO/1999/023372A2 |
A method and apparatus that converts time-resolved sensor signals into frequency domain signals using Fast Fourier Transforms and power spectral densities. A signal, as a means to assess catalyst performance such as a signal based on sen...
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WO/1999/023369A1 |
A method and apparatus convert time-resolved sensor signals into transfer functions and/or cumulative transfer function signals which can be attained by computation means (34) such as by using Fast Fourier Transforms. A signal, as a mean...
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WO/1999/006681A1 |
This invention pertains to a vehicular on-board diagnostic emission system (10) in which the system determines whether the vehicle is continuously in compliance with regulatory emission standards by sensing only hydrocarbon and carbon mo...
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WO/1999/000588A2 |
The present invention provides a method and apparatus for chemically heating a catalyst bed by feeding hydrogen to the catalyst (13). The invention also provides a method and apparatus for thermally conditioning a catalyst in order to en...
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WO/1998/059159A1 |
The invention relates to a method for improved monitoring of the conversion rate of an exhaust gas catalytic converter for an internal combustion engine. To achieve this, the temperature values determined downstream from the exhaust gas ...
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WO/1998/048152A1 |
A method for monitoring and controlling the performance of a catalytic converter (34) includes monitoring an exhaust gas stream from an engine (16) for the presence of methane. Upon detecting methane in the exhaust gas stream an oxygen s...
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WO/1998/045586A1 |
A process, arrangement and device are disclosed for monitoring a regenerating NOx accumulator (2) in an exhaust line, in particular of a diesel or lean mixture engine, through which flows a NOx-containing gas. The temperature in the exha...
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WO/1998/043732A1 |
A safe, reliable SCR system for reducing NO�x? emissions from a lean-burn internal combustion engine utilizes urea in aqueous solution. Overheating and hydrolysis of the solution are prevented by maintaining the temperature of the urea...
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WO/1998/044246A1 |
The invention relates to a method for monitoring the secondary air supply fed from a secondary air pump (6) to an exhaust gas duct (3) of an internal combustion engine (1) by the catalyzer (4), and which secondary air supply is measured ...
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WO/1998/038416A1 |
The catalyst control method of the invention continuously estimates a level of oxygen stored by a catalyst within a catalytic converter. The estimated oxygen stored by the catalyst is compared to a predetermined threshold and positive or...
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WO/1998/038415A1 |
A method for monitoring the performance of a catalytic converter (34) computes the oxygen storage capacity and desorption capacity of a catalyst within the catalytic converter (34). An engine control unit (10) receives mass flow rate inf...
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WO/1998/026164A1 |
A method for monitoring the performance of a catalytic converter includes the monitoring of output from a first gas sensor (16) positioned upstream from a catalytic converter (12) and a second gas sensor (18) located at a position downst...
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WO/1998/013589A1 |
Disclosed is a secondary-air system for an internal combustion engine, comprising a secondary-air line which is connected through an inlet (9a) to an intake line (1) and through an outlet to an exhaust line (8). The inlet (9a) is located...
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WO/1998/013128A1 |
The purification of exhaust fumes from internal combustion engines driven with a lean mixture, in particular Diesel engines, is problematic as to nitrogen oxide removal, since large mass flows of exhaust fumes are expelled even at low lo...
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WO/1998/010272A1 |
Disclosed is a monitoring sensor for a NOx catalytic converter presenting storage material for the adsorption of Nox, wherein the storage material forms the sensitive element in the sensor. The degree of storage material load is measured...
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WO/1998/005005A1 |
A process is disclosed for determining and/or paying a compensation for pollutants in the exhaust fumes of a combustion unit (1). The pollutants in the exhaust fumes are determined by at least one sensor (4) and an amount of monetary uni...
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WO/1997/017534A1 |
The invention relates to catalysts, to be arranged in the flow of exhaust gases from exhaust systems, preferably internal combustion engines, with a substrate (5) provided with a ceramic coating containing the catalyst, and at least one ...
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WO/1997/016631A2 |
An exhaust fume probe (8) has a measurement electrode (3) with which the resistance of a metal oxide layer (4) may be measured. The metal oxide layer (4) has a reduced catalytic activity. For a predetermined air ratio, the resistance of ...
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WO/1997/015751A1 |
Method for the testing of catalysers of combustion engines, where a gas sensor is placed in the exhausts after the catalyser which is sensitive to some substances normally burnable for the catalyser, for instance a thin oil. While the en...
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WO/1997/015752A2 |
An air mass meter is used to measure the secondary air mass displaced by the secondary air pump and the secondary air mass thus measured is compared by a control device with the target secondary air mass set by the control device. If the...
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WO/1997/015468A2 |
A method and device are proposed for detecting and documenting damage to catalytic converters caused by critical fuel levels in the fuel tank (10) of an internal combustion engine vehicle (12), the critical fuel levels in question being ...
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WO/1997/013964A1 |
The description relates to a process and a device for monitoring the operation of a catalyst, especially an oxidation and/or reduction catalyst, in a spontaneous-ignition internal combustion engine. There is a sensor (135) which generate...
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WO/1997/013058A1 |
An apparatus and a method for accurately detecting degradation in performance of a NOx catalyst which serves to reduce NOx exhausted from a diesel engine. Thus an apparatus for detecting deterioration of a NOx by catalyst in a diesel eng...
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WO/1997/012129A2 |
A process and device are disclosed for reacting a pollutant in an exhaust gas on a catalyst (2) with a reagent. The reagent is at first dosed depending on operation parameters of the exhaust gas and the temperature of the catalyst (2), i...
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WO/1996/041071A1 |
The invention relates to an arrangement for determining the oxygen buffer capacity in a catalytic converter (1) of an exhaust system. The arrangement includes an oxygen sensor (3, 32, 33) located downstream of at least one converter matr...
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WO/1996/036863A1 |
In an internal combustion engine having a ternary catalyst (12) arranged in an exhaust duct for purification of exhaust gas, a magnitude of stress bringing about deterioration of the ternary catalyst (12), for example, a relationship bet...
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WO/1996/028646A1 |
The apparatus for judging on deteriorations of a catalyst device and an oxygen content sensing device according to the present invention includes: a cooling water temperature sensing member for sensing a cooling water temperature, a thro...
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WO/1996/016257A1 |
The proposed device is used for monitoring the operatibility of catalytic converters and/or lambda probes in exhaust gas detoxication systems. It is characterised in that a pollutant sensor is placed downstream of (in relation to the exh...
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WO/1996/010685A1 |
In order to check the air ratio in the burner, the fuel-air mixture of the internal combustion engine is made richer or poorer depending on the momentary state of the mixture during operation of the burner and the resulting states of sig...
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WO/1996/001364A1 |
This invention is directed to a system for monitoring the efficiency of a catalyst employed to convert exhaust gases containing carbon monoxide, hydrocarbons and nitrogen oxides, e.g., those generated by an internal combustion engine suc...
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WO/1996/000943A1 |
A method and apparatus are disclosed for monitoring similar machine components loaded in parallel to produce diagnostic trend information used to predict component degradation or failure. Split exhaust manifolds (18, 20) are each provide...
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WO/1995/025277A1 |
The proposal is for a sensor for determining the gas component concentration in gas mixtures. The sensor has a solid oxygen-ion-conducting electrolyte (10) having a first measuring electrode (11) which catalyses the equilibrium setting o...
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WO/1995/017587A1 |
The invention pertains to a process for the manufacture of a catalytic converter for cleaning waste gas from combustion processes, preferably exhaust gas from internal combustion engines, having a plurality of parallel channels (11) form...
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WO/1995/017588A1 |
The invention relates to testing the convertability of a catalytic converter (VK), especially a precatalyzing system, in internal combustion engines (BK) of motor vehicles, the testing being done by temperature measurement immediately do...
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