48 results about "Oxygen storage capacity" patented technology

The application discloses a composite metal catalyst for catalytic degradation of VOCs at low temperature and a preparation method thereof, and belongs to the field of environmental protection catalysis technology. The composite metal catalyst comprises the following components in percentage by weight: 5-25% of a multi-component composite metal oxide, 65-90% of modified mesoporous zeolite, 2-6% of a composite additive, and 1-3% of a high-temperature-resistant binder. The multi-component composite metal oxide is a copper / manganese / cerium / zirconium quaternary composite oxide, and the molar ratio of copper, manganese, cerium and zirconium is 1:(0.8-1.2):(0.5-0.8):(0.2-0.5). The modified mesoporous zeolite is ZSM-5 mesoporous zeolite which is modified by rare earth ions and an amphoteric surfactant. The application adopts the copper / manganese / cerium / zirconium quaternary composite metal oxide as an active component, the introduction of cerium and zirconium forms a solid solution structure, greatly improves the oxygen storage capacity and the redox performance of the active component, and the synergistic effect of copper and manganese and cerium and zirconium significantly reduces the oxidation and decomposition temperature of VOCs.

The invention relates to the technical field of natural gas engine control, and discloses an engine aftertreatment catalyst control method and device, electronic equipment and a medium. The method comprises the following steps: acquiring the oxygen storage capacity corresponding to at least one degradation degree three-way catalyst TWC; constructing a first mapping relation between each oxygen storage amount and the opening degree value of the throttle valve under the specific working condition of the engine; constructing a second mapping relation between each oxygen storage amount and the voltage set value of the rear oxygen sensor under the specific working condition of the engine; in the actual operation process of the engine, the degradation degree of the TWC is monitored in real time, and the current oxygen storage amount of the TWC is determined based on the degradation degree; and the emission state of the engine is adjusted based on the current oxygen storage amount, the first mapping relation and the second mapping relation so that the emission state can meet the emission standard. The exhaust emission level of the automobile can be improved, and energy consumption is reduced.

The invention relates to a method for operating a drive unit for a motor vehicle, which has an exhaust-generating drive unit and an exhaust aftertreatment device for treating the exhaust gas. The method uses an exhaust aftertreatment model and an aging parameter describing the aging of the exhaust aftertreatment device to determine the concentration of an exhaust component present in the exhaust gas downstream of the exhaust aftertreatment device. The aging parameter is determined at times based on the oxygen storage capacity of the exhaust aftertreatment device and at other times based on a damage parameter determined using a temperature model for the exhaust aftertreatment device. The invention further relates to a drive unit for a motor vehicle and a computer program.

A method for the manufacture of a gasoline particulate filter (GPF) for the treatment of an exhaust gas is disclosed. The method comprises (i) forming a washcoat slurry; (ii) coating a wall-flow filter substrate with the washcoat slurry to form a washcoated substrate; and (iii) calcining the washcoated substrate to form a gasoline particulate filter. The washcoat slurry comprises (a) a platinum group metal selected from the group consisting of Pt, Pd, Rh and mixtures thereof; (b) an oxygen storage capacity (OSC) material; and (c) a C2-C6 aliphatic amino acid.

The invention relates to a multi-element rare earth oxide composite catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and a ternary composite material loaded on the carrier, the mass ratio of the carrier to the ternary composite material is (4: 6)-(7: 3); wherein the carrier is gamma-Al2O3 (aluminum oxide); the ternary composite material is composed of a La2O3 phase and an Nd-O solid solution phase, the proportion of the La2O3 phase is 20%-40%, and the proportion of the Nd-O solid solution phase is 60%-80%. The Nd element in the Nd-O solid solution phase has two valence states of Nd < 3 + > and Nd < 4 + >, and the molar ratio of the two valence states is as follows: Nd < 3 + > accounts for 35%-70%, and Nd < 4 + > accounts for 30%-65%. According to the obtained catalyst, the oxygen storage capacity and thermal stability of the catalyst are optimized by adjusting the La / Nd ratio and Nd valence state distribution, and the catalyst meets various vehicle catalysis requirements.

The application belongs to the technical field of ship exhaust purification, and particularly relates to a catalyst for decomposing N2O in the exhaust of a ship ammonia internal combustion engine and a preparation method thereof. 3+ By replacing Co ions in the Co3O4 spinel lattice into the lattice, the doping behavior can effectively reduce the number of hydroxyl groups on the surface of the catalyst, significantly weaken the adsorption and combination ability of water molecules, and thus improve the stability of the catalyst in a high-humidity exhaust environment. As an additive, CeO2 uses its oxygen storage capacity to promote the migration and desorption of oxygen species in the reaction, preventing the deactivation of active sites due to oxygen poisoning. The molecular sieve carrier not only provides a highly dispersed surface for the active component to prevent sintering, but also optimizes the adsorption and activation path of N2O and alleviates the poisoning effect of nitrogen-containing intermediate species or impurities in the exhaust on the Co active center during the reaction.

This utility model discloses a flow-diversion and temperature control device for an automotive catalyst oxygen storage capacity evaluation bench system, belonging to the field of automotive catalyst oxygen storage capacity evaluation bench systems. The device includes an execution unit and a control unit. The execution unit is connected to the engine exhaust manifold outlet and includes a flow-diversion mechanism and a temperature control mechanism. When the engine is running, the flow-diversion mechanism diverts the engine exhaust gas source to control the exhaust gas flow rate entering the catalyst body. The temperature control mechanism is located at the inlet of the flow-diversion mechanism and is used to control the temperature of the engine exhaust gas source. The control unit controls the execution unit. This device solves the problem that conventional engine bench systems with single-pipe structures cannot adjust the exhaust flow rate during automotive catalyst oxygen storage capacity evaluation testing, and the problem of catalyst inlet temperature fluctuations caused by long stabilization times before and after rich / lean switching of the excess air coefficient, ensuring the accuracy of oxygen storage capacity testing.

The embodiment of the invention provides an oxygen storage capacity detection method and device, electronic equipment, a storage medium and a program product. The method comprises the steps that in a preset first time period, the starting time step when a catalytic converter of an engine starts to store oxygen and the ending time step when the oxygen storage amount of the catalytic converter exceeds a preset oxygen storage amount threshold value are obtained, and the starting time step is earlier than the ending time step; detecting air coefficient deviation information of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter in a second time period from the starting time step to the ending time step; and detecting the oxygen storage amount of the catalytic converter according to the preset oxygen storage amount detection template information, the starting time step, the ending time step and the air coefficient deviation information. The method is used for achieving the effect of efficiently detecting the oxygen storage amount of the catalyst.

The invention provides an engine system shutdown delay determination method which comprises the following steps: in response to an engine shutdown instruction, acquiring an actual EGR (Exhaust Gas Recirculation) rate value before shutdown and an exhaust gas length ratio before shutdown; according to the actual EGR rate value before shutdown, the waste gas length proportion value before shutdown and the real vehicle delay database, the duration of exhausting all waste gas in the first pipeline from the throttle valve is obtained to serve as the first delay duration; the flowing duration of gas in the engine system flowing from a throttle valve to an exhaust port of an engine cylinder is obtained to serve as second delay duration; the first delay duration and the second delay duration are summed, and the initial shutdown delay duration of the engine system is obtained; according to the temperature difference between the current actual temperature of at least one target monitoring object in the engine system and the corresponding preset target temperature and the proportion deviation difference of the current oxygen storage amount proportion of a catalyst in the engine system relative to the preset target oxygen storage amount proportion, the target oxygen storage amount proportion is obtained; and adjusting the initial shutdown delay duration to obtain a final shutdown delay duration.

This invention provides a method for manufacturing an aging catalyst based on an engine bench. The method includes: Step 1, performing state testing and aging tests on a new catalyst on an engine bench; Step 2, comparing whether the test parameters in Step 1 meet the requirements. If not, returning to Step 1 for aging tests; if they meet the requirements, installing it on a vehicle for emission testing; Step 3, if the emission test results do not meet the requirements, returning to Step 1 to continue the aging test; if they meet the requirements, ending the test. The state testing includes a combination or any one of the following: oxygen storage capacity test during the catalyst's ignition phase, emission test during the catalyst's ignition phase, and oxygen storage capacity test under hot conditions. This invention's manufacturing method ensures the engine operates in a richer state, resulting in more stable combustion, shorter aging time, and allows more air-fuel mixture to mix and burn in front of the catalyst during changes in operating conditions, thereby controlling the degree of aging inside the catalyst carrier and making it closer to real-world conditions.

The application discloses a kind of high oxygen storage cerium zirconium solid solution materials and preparation method, belong to rare earth catalytic material technical field, the method includes the following steps: precursor preparation, ultrasonic dispersion, double gradient precipitation, ultrasonic aging, solid-liquid separation, three-stage calcination and cooling with furnace.The application avoids coarse grain and uneven particle size distribution through the synergistic effect of double gradient precipitation and ultrasonic aging, so that the material is not easy to occur grain abnormal growth and structure collapse in long-term high temperature service.At the same time, the gradient calcination process controls the crystal densification and lattice reconstruction by steps, reduces the separation of fluorite phase and pyrochlore phase which is easy to occur in traditional low temperature single-stage calcination, maintains the stable crystal phase structure, ensures that the material can still retain sufficient active surface and pore structure under high temperature, thermal shock alternating working condition, significantly improves the oxygen storage capacity and long-term durability of catalyst carrier.

The invention belongs to the technical field of testing, and particularly discloses a multi-channel catalyst evaluation device and method for oxygen storage capacity testing. A reaction system of the device comprises a plurality of single-channel reactors, a plurality of analysis systems correspond to the single-channel reactors respectively, a carrier gas pipeline and a basic atmosphere gas pipeline of a gas distribution system comprise a gas source I, a pressure stabilizing valve, a pressure gauge, a switch valve and a one-way valve which are sequentially connected, and the outlet end of the one-way valve is divided into a plurality of branches I and provided with MFCs; the liquid supply source and the auxiliary carrier gas source are connected with the liquid evaporation tank and a pipeline is provided with an MFC; a CO gas pipeline and an O2 gas pipeline of the OSC gas switching unit comprise a gas source II, a pressure stabilizing valve, a pressure gauge, a switching valve and a one-way valve which are connected in sequence; the outlet end of the one-way valve is divided into a plurality of branches II provided with auxiliary carrier gas and is provided with an MFC and a high-speed switching valve; and the control system is electrically connected with each switch valve of the gas distribution system, each MFC, each high-speed switching valve, the reaction system and the analysis system.

The application discloses a kind of vehicle rear oxygen sensor response fault diagnosis method, device and vehicle.It includes: the oxygen storage capacity of catalytic converter under different exhaust flow is obtained;According to different exhaust flow and its corresponding oxygen storage capacity, the relationship between exhaust flow and oxygen storage capacity is determined;According to the relationship between exhaust flow and oxygen storage capacity, whether the response of rear oxygen sensor is fault is diagnosed.Under the premise that the original operating condition of vehicle is not changed, the slow response fault of rear oxygen sensor is diagnosed, the stability of entire automobile system is ensured, and the method is not only suitable for traditional car, but also suitable for hybrid electric vehicle.

The invention discloses a three-way catalyst as well as a preparation method and application thereof. The three-way catalyst comprises a carbon carrier, and a noble metal, a transition metal and a rare earth metal which are loaded on the carbon carrier, the noble metal is selected from Pt and Pd, the transition metal is selected from Fe, Co or Ni, and the rare earth metal is selected from Ce or La. The invention provides application of the three-way catalyst in magnetic field driven room-temperature CO oxidation reaction. The three-way catalyst has the high activity of precious metal, the oxygen storage capacity of rare earth metal and the magnetic response characteristic of transition metal, and under the action of a direct-current magnetic field generated by adding a magnet, the CO oxidation reaction conversion rate can be increased by 10-30 times in a room temperature state.

Disclosed herein are mixed oxide compositions containing mixed oxides of lanthanum, aluminum, a mixture of iron and strontium. These compositions optionally also may contain additional rare earth dopants that are not cerium, alkaline earth dopants, and transition metal dopants. These mixed oxide compositions surprisingly exhibit enhanced oxygen storage capacity (OSC) when measured at temperatures between 350° C. and 800° C., in particular between 450° C. and 800° C., even after aging at elevated temperatures. These mixed oxide compositions importantly contain a primary perovskite phase, which in one embodiment is LaAlO3, and a secondary perovskite phase, which in one embodiment comprises a lanthanide, a transition metal, and alkaline earth mixed oxide. The compositions may be used as catalytic carriers which may be used in gas exhaust purification catalysts and / or as CO2 conversion catalysts.

To provide a catalyst temperature calculation device capable of accurately calculating the temperature of a three way catalyst having oxygen storage capacity.SOLUTION: A catalyst temperature calculation device comprising: an estimation unit configured to estimate a temperature of a three way catalyst that has an oxygen storage capacity and purifies exhaust gas from an engine, based on a heat quantity of the exhaust gas discharged from the engine; and a correction unit configured to correct the temperature of the three way catalyst estimated by the estimation unit, based on an ammonia concentration in exhaust gas discharged from the three way catalyst into which exhaust gas having a rich air-fuel ratio flows.SELECTED DRAWING: Figure 2

The present invention provides a catalyst article for treating exhaust gas, the catalyst article comprising a substrate and a first catalytic region disposed on the substrate, wherein the first catalytic region comprises: a first oxygen storage capacity (OSC) material; and a first alumina support material having a first platinum group metal (PGM) component supported thereon; wherein the first alumina support material comprises theta alumina and the first PGM component comprises Pd and Rh.

A catalytic wall-flow filter for exhaust gases from a gasoline engine is disclosed. The catalytic wall-flow filter comprises a wall-flow filter substrate, a first TWC coating in a first plurality of channels, and a second TWC coating in a second plurality of channels. The first TWC coating comprises palladium, rhodium, a first oxygen storage capacity (OSC) material, and a first inorganic support. The second TWC coating comprises platinum, rhodium, a second OSC material, and a second inorganic support.

The invention relates to the technical field of catalyst oxygen storage capacity testing, in particular to a catalyst oxygen storage capacity testing system and method.The catalyst oxygen storage capacity testing system comprises a gas supply module, a reaction module and a control and data acquisition module, 18O marking gas, 16O reference oxygen, reducing gas and inert carrier gas are provided, and flow, temperature and pressure are accurately controlled. The method comprises a 18O / 16O isotope homogeneous phase exchange experiment, a dynamics calculation experiment and an oxygen storage capacity calculation experiment, partial pressure changes of 16O2, 16O18O and 18O2 are monitored in real time through mass spectrometry, the oxygen exchange rate, the surface diffusion coefficient (DCS) and the bulk phase diffusion coefficient (DCB) are calculated, and the oxygen storage capacity (CO-OSC and H2-OSC) is calculated based on CO oxidation or H2 reduction reaction. The oxygen dynamic behavior is synchronously analyzed, the blank of a traditional method is filled, and the method has the advantages of high precision and multiple parameters, is suitable for the fields of automobile exhaust purification, industrial waste gas treatment and the like, and promotes conversion of catalyst research and development from experience screening to rational design.

An internal combustion engine (1) has a three-way catalyst (15). An engine controller (9) has an oxygen amount calculation unit (102) determining an amount of oxygen flowing into the three-way catalyst (15) per unit time and an oxygen storage amount calculation unit (108) estimating a current oxygen storage amount by integrating positive and negative oxygen amount. A reference oxygen storage capacity calculation unit (107) outputs a reference oxygen storage capacity according to an intake air amount output by an intake air amount calculation unit (101) so that as the intake air amount is larger, the reference oxygen storage capacity becomes smaller. A catalyst diagnosis unit (104) judges catalyst deterioration by comparing a current oxygen storage capacity with the reference oxygen storage capacity set by taking the intake air amount into consideration.

Exhaust gas purification system of an internal combustion engine, comprising: a catalyst (20) arranged in an outlet passage and capable of storing oxygen; and an air-fuel ratio control device (31) configured to control the air-fuel ratio of incoming exhaust gas flowing into the catalyst (20), wherein the catalyst (20) comprises a precious metal and the precious metal has a property that a vapor pressure decreases at a predetermined temperature when it is oxidized, In the event that the temperature of the catalyst (20) is greater than or equal to a threshold temperature or a temperature increase of the catalyst (20) is predicted, the air-fuel ratio control device (31) is configured to make the air-fuel ratio of the incoming exhaust gas leaner than a stoichiometric air-fuel ratio, so that an oxygen storage quantity of the catalyst (20) becomes greater than or equal to an upper reference quantity, and the threshold temperature is set at a temperature at which the vapor pressure of the precious metal does not increase when local heat generation of the catalyst (20) occurs due to the supply of oxygen.

The invention belongs to the technical field of catalysts, and particularly relates to a non-noble metal doped perovskite catalyst suitable for a multi-element fuel engine and a preparation method of the non-noble metal doped perovskite catalyst. According to the non-noble metal doped perovskite catalyst, La is used as A-site metal, Mn is used as B-site metal, and Sr and K elements are doped and introduced into the A site; fe element is doped and introduced into the B site; the expression of the perovskite type catalyst is La1-x-ySrxKyMn1-zFezO3, x is more than or equal to 0.05 and less than or equal to 0.2, y is more than or equal to 0.05 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.2, and x + y is more than or equal to 0.1 and less than or equal to 0.4. The three-dimensional macroporous structure of the catalyst increases the specific surface area and active sites, and promotes reactant transmission and catalytic efficiency; sr, K and Fe are co-doped, so that the oxygen storage capacity and the oxidation-reduction performance are improved, and the activation energy is reduced; and under the condition of extremely low dosage, the ignition temperature of smoke dust is obviously reduced, and the CO conversion rate of 90% or above is realized at about 230 DEG C.

The invention provides a testing method, device and equipment, a storage medium and a program product, and relates to the technical field of vehicle testing. The method comprises the steps that an abnormal oxygen storage amount parameter is input into a vehicle control system, and the abnormal oxygen storage amount parameter is used for representing the fault state of a catalyst; updating a mapping table of the oxygen storage capacity of the catalytic converter according to the abnormal oxygen storage capacity parameter, wherein the mapping table comprises a corresponding relation between the performance parameter of the catalytic converter and the oxygen storage capacity; the performance parameters comprise the temperature and the gas mass flow rate of a catalyst brick; and obtaining a response state of the vehicle control system to the abnormal oxygen storage amount parameter, wherein the response state comprises a fault code response state and an indicator lamp response state. According to the method, the test efficiency is improved.

Provided is a catalytic gasoline particulate filter (GPF) for the treatment of exhaust gas from a gasoline engine, the catalytic GPF comprising: a wall-flow filter substrate; and a first coating disposed on the wall-flow filter substrate, wherein the first coating comprises: an inorganic oxide support; an oxygen storage capacity (OSC) material; a platinum group metal (PGM) component; and an Fe component; wherein the first coating comprises from 0.05 to 1.5 wt.% of the Fe component, calculated based on the total weight of Fe in the Fe component relative to the total weight of the inorganic oxide support and OSC material. The first coating is able to provide an excellent balance of improved oxygen storage capacity and catalytic activity, even after ageing, without significantly increasing the backpressure caused by the catalytic GPF in use.

An exhaust purification device includes: a filter including an oxygen storage capacity (OSC) material; a secondary air supply passage connected to the exhaust passage upstream of the filter; a secondary air control valve disposed in the secondary air supply passage and configured to provide periodicity to secondary air supplied to the secondary air supply passage; and an engine control unit (ECU), wherein the ECU controls the secondary air control valve so as to supply the secondary air with a predetermined frequency and a maximum amplitude of an oxygen concentration. The secondary air control valve is controlled so that when the frequency of the secondary air is fixed to a value of greater than 0 Hz and less than or equal to 1.5 Hz, the maximum amplitude of the oxygen concentration is greater than 0.50% and less than or equal to 3.0%.

The application provides an engine control method, device, vehicle and storage medium. The engine control method comprises the following steps: in response to an engine fuel cut instruction, calculating a current oxygen storage capacity coefficient of a catalyst according to an actual oxygen storage amount and a maximum oxygen storage amount of the catalyst; querying a target air-fuel ratio compensation required for oxygen removal of the catalyst according to the oxygen storage capacity coefficient; controlling the engine to delay fuel cut or enter a fuel cut working condition according to the oxygen storage capacity coefficient and the target air-fuel ratio compensation; and increasing the fuel injection amount according to the target air-fuel ratio compensation after the engine restarts and oil supply is restored. The application can reduce the emission of the automobile.

The invention discloses a fuel injection quantity correction method and system of an engine, a vehicle and equipment. The fuel injection quantity correction method of the engine comprises the steps that the oxygen storage capacity value and the oxygen storage quantity of a three-way catalyst are obtained; according to the oxygen storage capacity value and the oxygen storage amount of the three-way catalyst, an oxygen storage difference value between the oxygen storage capacity value and the oxygen storage amount of the three-way catalyst is obtained; according to the oxygen storage difference value between the oxygen storage capacity value and the oxygen storage capacity of the three-way catalyst, an oxygen storage capacity factor is determined; the deviation value between the target excess air coefficient and the actual excess air coefficient is obtained; and according to the deviation value and the oxygen storage quantity factor, the fuel injection quantity of the engine is corrected. By the adoption of the three-way catalytic converter control method and device, the performance of the three-way catalytic converter can be fully utilized, the response speed in the fuel injection quantity control process is increased, the overshoot is reduced, then emission and fuel consumption of the whole vehicle are improved, and emission and energy consumption are effectively reduced.

This prevents the deterioration of exhaust emissions when the engine restarts after intermittent shutdown. [Solution] An engine system comprising an upstream catalyst and a downstream catalyst, which are three-way catalysts having oxygen storage capacity; an air-fuel ratio sensor provided between the two catalysts; a NOx sensor provided downstream of the downstream catalyst; and a control device that controls the engine so that the air-fuel ratio becomes a target air-fuel ratio, wherein the control device includes a first candidate calculation unit that calculates a first candidate for a return target air-fuel ratio used for return control from intermittent stop based on the air-fuel ratio detected by the air-fuel ratio sensor during intermittent stop of the engine; an oxygen concentration calculation unit that calculates an oxygen concentration based on the pump cell current of the NOx sensor during the intermittent stop; a second candidate calculation unit that calculates a second candidate for the return target air-fuel ratio based on the oxygen concentration; and a setting unit that sets a final return target air-fuel ratio used for the return control, taking into consideration the first candidate and the second candidate.

An estimation method for determining the oxygen storage capacity of a first catalytic converter, which is arranged upstream of a second catalytic converter along an exhaust duct of an internal combustion engine. The estimation method provides for the steps of: carrying out an initial combustion phase, in which the combustion takes place with a lean air-fuel mixture at least until a first oxygen probe arranged downstream of the second catalytic converter signals a switch to a lean air-fuel mixture; carrying out an intermediate combustion phase immediately following the initial combustion phase and in which the combustion takes place with a rich air-fuel mixture at least until a second oxygen probe arranged downstream of the first catalytic converter signals a rich air-fuel mixture; and carrying out a final combustion phase immediately following the intermediate combustion phase and in which the combustion takes place with a lean air-fuel mixture after the second oxygen probe signals a rich air-fuel mixture and at least until the second oxygen probe signals a lean air-fuel mixture.

The invention relates to a catalyst oxygen storage amount detection method and device, a vehicle and a storage medium, and belongs to the technical field of aftertreatment fault diagnosis. The method comprises the steps that whether a target working condition point is a steady-state working condition point or not is judged according to the fluctuation conditions of the exhaust temperature and the exhaust flow of an engine in a time window where the target working condition point is located; when the fluctuation condition meets a preset requirement, determining that the target working condition point is a steady-state working condition point; and judging whether the oxygen storage amount of the catalytic converter is abnormal or not according to the oxygen storage amount of the catalytic converter corresponding to the steady-state working condition point. According to the method, more steady-state working condition points can be diagnosed, so that the abnormal condition of the oxygen storage amount of the catalyst can be accurately and timely judged.