17025results about "Silencing apparatus" patented technology

An exhaust gas aftertreatment system includes a housing assembly, a first catalyst member, and a second catalyst member. The housing assembly includes an upstream housing, a decomposition housing, a distributing housing, and a catalyst member housing. The upstream housing is centered on an upstream housing axis. The decomposition housing is coupled to the upstream housing and configured to receive exhaust gas from the upstream housing. The distributing housing is coupled to the decomposition housing and configured to receive the exhaust gas from the decomposition housing. The catalyst member housing is coupled to the distributing housing and configured to receive the exhaust gas from the distributing housing. The catalyst member housing is centered on a catalyst member housing axis that is parallel to the upstream housing axis. The first catalyst member extends within the catalyst member housing.

A computing system is disposed remote from a vehicle and communicably coupled to the vehicle over a network. The computing system includes a communications interface, one or more processors, and memory storing instructions that when executed by the one or more processors, cause the one or more processors to receive a first emissions data packet from a vehicle controller, the first emissions data packet including a plurality of emissions values regarding operation of a vehicle; determine whether a first cumulative emissions value is greater than a threshold value; and responsive to determining that the first cumulative emissions value is greater than the threshold, performing, by the remote computing system, corrective operations.

The invention discloses a molecular sieve confinement noble metal catalyst for CO-SCR denitration as well as a preparation method and application thereof, and belongs to the technical field of catalytic reduction of nitrogen oxides. The catalyst comprises a molecular sieve carrier and an Ir metal nanocluster loaded in the molecular sieve carrier through confinement encapsulation. The preparation method comprises the following steps: mixing a first metal precursor solution with a first ligand to obtain a first mixed solution; mixing a second metal precursor solution with a second ligand to obtain a second mixed solution; mixing a silicon source, an aluminum source, alkali and a solvent to obtain a molecular sieve precursor solution; and mixing the molecular sieve precursor solution with the first mixed solution, then adding the second mixed solution, carrying out a hydrothermal crystallization reaction, and then carrying out centrifugal washing, drying and calcining to obtain the catalyst. The catalyst has good stability, shows a high nitrogen oxide conversion rate in an atmosphere containing O2 and SO2, and improves the catalytic ability of the catalyst to nitrogen oxides under different conditions.

A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end and an outlet end with an axial length L; a first catalytic region comprising a first platinum group metal (PGM) component, wherein the first PGM component comprises Rh and Pt; a second catalytic region comprising a second PGM component, wherein the second PGM component comprises Pd; and wherein the first PGM component has a Pt to Rh ratio of at least 1:20.

The invention discloses a tail gas self-treatment low-emission zero-carbon ammonia hydrogen engine system and a control method, and the tail gas self-treatment low-emission zero-carbon ammonia hydrogen engine system comprises a pure ammonia flameless combustion ammonia decomposition system, a NOx decomposition system, an ammonia hydrogen engine, an air source and an ammonia gas source. The NOx decomposition system utilizes a thermal decomposition technology of nitrogen oxide to realize the reutilization of waste heat of combustion tail gas of the pure ammonia hedging type flameless combustion furnace and decompose the nitrogen oxide in the engine tail gas into nitric oxide, and the ammonia-hydrogen engine utilizes the combustion of the engine to do work, so that the tail gas of the pure ammonia hedging type flameless combustion furnace can be recycled, and the nitrogen oxide in the tail gas of the pure ammonia hedging type flameless combustion furnace can be recycled. Heat utilization of ammonia gas is achieved, and combustion-supporting tail gas needed by the pure ammonia opposite-flushing type flameless combustion furnace is generated.

The invention discloses a control method and system for preventing crystallization blockage of a urea nozzle. The method comprises the steps that S100, the engine state, the environment temperature, the exhaust flow and the exhaust temperature are obtained; and S200, based on the environment temperature, the exhaust flow and the exhaust temperature, exhaust energy is obtained through calculation. And S300, based on the exhaust energy, the urea rate is obtained through calculation. And S400, based on the state of the transmitter and the exhaust temperature, whether the continuous urea spraying stopping time reaches a preset limiting value or not is judged. And S500, if the urea spraying stopping continuous time exceeds the preset limit value, urea is sprayed to the catalytic converter according to a preset method on the basis of the urea rate. Therefore, according to the control method for preventing crystallization blockage of the urea nozzle, crystallization blockage of the urea nozzle can be effectively prevented, faults are reduced, and influences on normal operation of a vehicle and extra maintenance cost are avoided.

The invention discloses a two-stage SCR urea injection amount control method, device and equipment, and relates to the technical field of engine exhaust aftertreatment. The method comprises the steps that the real-time working mode of an engine is obtained, and the control mode of a front-stage SCR and the control mode of a rear-stage SCR are determined according to the obtained working mode; on the basis of the determined control mode, the preceding-stage SCR and the post-stage SCR conduct corresponding urea injection amount calculation, and control mode switching is conducted according to the working state of the SCR; wherein the control mode of the front-stage SCR comprises an initial mode, a target efficiency mode and a high-efficiency mode, and the control mode of the rear-stage SCR comprises an initial mode and a high-efficiency mode. According to the method, the coordination control state of the two-stage SCR is determined according to the working mode of the engine, nitrogen oxide emission is more effectively reduced for different working modes, meanwhile, the influence of the DPF state on coordination control of the two-stage SCR is considered, and efficient coordination control over the urea injection amount of the two-stage SCR is achieved.

The invention relates to a burner (10) for an exhaust tract through which exhaust gas from an internal combustion engine flows, comprising a combustion chamber (12) in which a mixture comprising air and fuel is to be ignited and thereby combusted, comprising an inner swirl chamber (18) through which a first part of the air flows, which has a first swirl-generating device (38) by means of which a swirl-shaped flow of the first part of the air can be effected, and a first outlet opening (20) through which the first part of the air flows, and comprising an outer swirl chamber (28) surrounding at least a longitudinal region of the inner swirl chamber (18) in the circumferential direction of the inner swirl chamber (18), through which a second part of the air flows, which has a second swirl-generating device (40) by means of which a swirl-shaped flow of the second part of the air can be effected,and has a second outlet opening (32) through which the second part of the air flows and the first part of the air flows through the inner swirl chamber (18) and the first outlet opening (20).

The invention discloses a gasoline engine particle trap with low back pressure amplification and narrow pore size distribution and a preparation method thereof, and belongs to the technical field of gasoline engine tail gas emission treatment. The preparation method comprises the following steps: mixing an inorganic raw material, a pore-forming agent, a binder and water to prepare a pug, carrying out pugging, extrusion molding, microwave drying and high-temperature sintering to prepare a ceramic matrix, and carrying out pore plugging and catalyst coating on the ceramic matrix to prepare the gasoline engine particle trap. Wherein the median particle size D50 of a mixture formed by mixing the inorganic raw materials, the pore forming agent and the binder is controlled to be within the range of 20-26 microns, the span (D90-D10) / D50 is smaller than 1.4, and the gasoline engine particle trap with the back pressure amplification being 13-56% is obtained. According to the method, the pore size distribution condition of the ceramic matrix can be pre-judged in actual production, so that particle distribution adjustment of raw materials is carried out, and the pore size consistency of gasoline engine particle traps produced in batches is guaranteed.

A combustor includes a housing and a combustion chamber assembly. The combustion cavity assembly comprises a cylinder part, a mounting base, a first spark plug, a second spark plug and a diesel nozzle assembly. The barrel part comprises a combustion cavity. The mounting base comprises an air inlet channel and a mounting cylinder part. The first sparking plug and the second sparking plug stretch into the combustion cavity in a protruding mode. The diesel oil nozzle assembly is installed on the installation barrel body part and used for spraying diesel oil into the combustion cavity. The diesel nozzle assembly comprises a valve needle, a first rotational flow assembly located at the bottom of the valve needle and a sleeve part located below the first rotational flow assembly, the first rotational flow assembly comprises an inlet hole and a closure spraying hole, and the sleeve part is provided with a mixing cavity communicating with the closure spraying hole. And the mixing cavity is used for mixing diesel oil and air. The closure spraying hole improves the continuity of spraying diesel oil at low power.

A combustor includes a housing and a combustion chamber assembly. The combustion cavity assembly comprises a cylinder part, a mounting base, a first spark plug, a second spark plug and a diesel nozzle assembly. The barrel part comprises a combustion cavity. The mounting base comprises an air inlet channel, a first air hole through hole and a second air hole through hole. The first sparking plug and the second sparking plug stretch into the combustion cavity in a protruding mode. A first airflow purging channel is further arranged between the first spark plug and the first wall part so that part of air can be used for purging the first spark plug. A second airflow purging channel is further arranged between the second spark plug and the second wall part so that part of air can be used for purging the second spark plug. According to the combustor, the probability of carbon deposition of the first spark plug and the second spark plug can be reduced.

The invention discloses a preparation method of an adsorption and reduction bifunctional catalyst for denitration of tail gas of a diesel vehicle. The preparation method comprises the following steps: uniformly loading a Pd component and a Cu component on the surface of a molecular sieve to prepare a corresponding Pd-based molecular sieve and a corresponding Cu-based molecular sieve; and then coupling the Pd-based molecular sieve and the Cu-based molecular sieve according to a certain proportion by using a solid-phase grinding means to obtain the adsorption and reduction dual-functional Pd-Cu / SSZ-13 catalyst. The adsorption and reduction bifunctional Pd-Cu / SSZ-13 catalyst prepared by the method not only has excellent SCR activity at the temperature of 200 DEG C or above, but also has good PNA capacity at the temperature of 200 DEG C or below, can realize high-efficiency denitration of diesel vehicle tail gas in a full-temperature section, and can be widely applied to a diesel vehicle tail gas after-treatment system.

A control system for an engine comprising a turbocharger includes a cold light off catalyst (CLOC), a main catalyst, a CLOC valve, and a controller. The CLOC is positioned in a bypass passage around a turbine of the turbocharger. The main catalyst is disposed downstream of the turbine and the CLOC. The CLOC valve selectively routes exhaust flow from the engine between the turbine and the CLOC. The controller determines whether a temperature of the main catalyst is less than a threshold; commands a CLOC mode wherein the CLOC valve routes at least some exhaust to the CLOC based on the temperature being less than the threshold; determines whether a boost is requested at the engine; determines whether a full turbine input is needed to satisfy the requested boost; and disables the CLOC mode based on a determination that a full turbine input is needed.

The invention belongs to the technical field of three-way catalyst equipment, and discloses an anti-collision and anti-vibration three-way catalyst which is technically characterized by comprising a three-way catalyst shell, a plurality of sets of bearing rings distributed in parallel are arranged in an inner cavity of the three-way catalyst shell, and ceramic carriers are arranged in the bearing rings; a bearing ring is arranged on the surface of the three-way catalyst shell, a positioning mechanism matched with the bearing ring is arranged in an inner cavity of the three-way catalyst shell and comprises a supporting assembly and an adjusting assembly, an air guide mechanism is arranged on the surface of the bearing ring and comprises multiple sets of telescopic sleeves, storage assemblies and telescopic assemblies, and the storage assemblies are arranged on the telescopic sleeves. When the element catalyst shell is impacted, the supporting assembly and the adjusting assembly are arranged to be matched with each other, the multiple sets of bearing rings and ceramic carriers at the impact points can be automatically controlled to move towards the two sides correspondingly, and then the bearing rings and the ceramic carriers are effectively prevented from being damaged.

The invention provides a urea injection method and device, a readable storage medium and a tail gas treatment system.The urea injection method comprises the steps that under the condition that an engine meets the cold start condition, the urea required injection rate is determined according to the actual exhaust mass flow, the actual exhaust temperature, the environment temperature before start and the actual temperature before SCR of the engine, and the urea required injection rate is determined; the urea injection mechanism is controlled to enter a cold start injection mode, the cold start injection mode is the mode that the urea injection mechanism injects urea into the catalytic reaction container at the urea required injection rate, and the actual temperature before SCR is the actual temperature of an inlet of the catalytic reaction container; and under the condition that the urea injection termination condition is met, the urea injection mechanism is controlled to stop injecting urea. The problem that in the prior art, the nitrogen and oxygen emission content is high in the cold start process of an engine is at least solved.

The invention discloses a biogas internal combustion engine exhaust gas waste heat cascade reutilization heat energy recovery device which comprises an exhaust gas conveying pipeline, a heat exchange cavity is formed in the exhaust gas conveying pipeline, a plurality of tower-shaped spiral heat exchange pipelines are arranged in the heat exchange cavity, the multiple heat exchange pipelines are vertically and sequentially distributed, the heat exchange pipelines are corrugated pipelines, and the heat exchange pipelines are communicated with the heat exchange cavity. A power rod is arranged in the middle of the heat exchange pipeline; the vibration motor and the power rod are arranged in the waste gas conveying pipeline, so that the power rod can guide and transmit the driving force of the vibration motor to the tower-shaped spiral heat exchange pipeline capable of extending and contracting through the hard connecting structure or the soft connecting structure, and the heat exchange pipeline can shake up and down in the heat exchange operation period; and therefore, water flowing in the pipeline can be driven to roll up and down, the water flowing in the pipeline can be more sufficiently and uniformly attached to the inner wall of the heat exchange pipeline, the heating area of the pipeline is more uniform, and the overall heat exchange effect is effectively improved.

The invention belongs to the field of engine aftertreatment systems, and provides a composite two-stage SCR system, a control method, an aftertreatment system.The system comprises a first SCR, a first ASC, a DOC, a DPF, a second SCR, a second ASC, a calculation control unit, an electric heating device, a gas concentration detection unit and an exhaust temperature unit; and the control unit is used for determining a urea injection control strategy of the first SCR and the second SCR and a working strategy of the electric heating device according to the nitrogen oxide concentration and the nitrogen dioxide proportion detected by the gas concentration detection unit and the temperature obtained by the exhaust temperature unit, and respectively controlling the first SCR, the second SCR and the electric heating device to work according to the determined strategies. According to the invention, the cooperative control requirement of ultralow nitrogen oxide emission and nitrous oxide gas emission limitation of the diesel engine can be met.

The invention discloses a control method and system for DPF operation regeneration of a special vehicle, and the control method comprises the steps: obtaining a vehicle state parameter through an ECU, and judging whether the vehicle state parameter meets a DPF regeneration triggering request or not; and if the DPF regeneration triggering request is met, the running state of the vehicle is judged, and an idling state or an operation state is generated. And if the running state of the vehicle is the operation state, the ECU reminds a driver whether to enter a regeneration mode or not. And if the driver confirms to enter the regeneration mode, the engine enters the DPF regeneration mode to execute operation. And after DPF regeneration succeeds or fails, the engine quits the DPF regeneration mode. Therefore, according to the control method for DPF operation regeneration of the special vehicle, by adding the whole vehicle operation state parameter judgment conditions, DPF regeneration can be completed without stopping operation when the special vehicle continuously operates in the static state.

A flexible U-bolt assembly includes a clamping bracket including a receiver and a U-bolt including (a) a first end fixed to the clamping bracket, (b) a second end adapted for receipt in the receiver and (c) a flexible elongated body extending between the first end and the second end.

A marine urea aqueous solution preparation device, and a preparation method therefor. The marine urea aqueous solution preparation device comprises a water bath barrel (1), a preparation barrel (2) fixed to an inner wall of the bottom of the water bath barrel (1) by means of a support leg, and a gap between the water bath barrel (1) and the preparation barrel (2) is used to contain fresh water to heat the preparation barrel (2). A top cover (6) is fixed to the top of the preparation barrel (2) by means of multiple bolts, and multiple heaters (11) are fixed to an inner wall of the water bath barrel (1). The urea aqueous solution is stirred by means of a stirring rod (3), which can sequentially drive a swinging structure and an intermittent structure, so that urea particles are intermittently sprinkled into the preparation barrel (2) in small batches.

An electric motor having a stator and a rotor in which the electric motor is an axial flux motor. The stator has a multiplicity of cores which, along a circumferential direction, are disposed beside on another on a common first diameter and are in each case surrounded by one coil. The rotor has a multiplicity of magnets which, along the circumferential direction, are disposed beside one another on a common second diameter on a support. Each magnet in the circumferential direction extends across a first angular range and the magnets are disposed so as to be mutually spaced apart by a second angular range formed by the support, which support is also heatable by the stator by induction. The second angular range is at least 30% of the first angular range.

An exhaust valve includes a pipe body connecting an upstream pipe and a downstream pipe for exhaust, a valve plate disposed inside the pipe body in a state of being attached to a rotary shaft that rotates by drive of an actuator, the valve plate configured to rotate to open / close an exhaust flow path inside the pipe body, and a stopper fixed inside the pipe body and configured to come into contact with the valve plate in a closed state. In the stopper, at least one of an upstream contact surface at which the valve plate makes contact and a downstream contact surface at which the valve plate makes contact runs along an inner peripheral surface of the pipe body at a position closer to an upstream side or a downstream side of the exhaust than an outer periphery of the rotary shaft.

A turbine engine assembly generates an exhaust gas flow that is communicated through a core flow path. The exhaust gas flow is split into a first exhaust gas flow and a second exhaust gas flow. Water from the second exhaust gas flow is condensed and extracted by a condenser. The extracted water is transformed into a steam flow within an evaporator system utilizing thermal energy from at least the second exhaust gas flow.

The present application discloses a method and system for an emission control device including a particulate filter with a bypass. In one example, the method includes bypassing the particulate filter when the exhaust gas has a reduced soot load and when the particulate filter has a reduced soot storage. The method further includes reducing the filter bypass flow and terminating or adjusting a deceleration fuel cut-off operation due to an exhaust gas temperature near the particulate filter being above a threshold.

The invention relates to the technical field of diesel generators, in particular to an environment-friendly low-noise diesel generator set. Comprising a unit, the unit is provided with a generator, the unit is provided with a heat dissipation plate, the unit is fixedly connected with a fixed shell, a cooling shell is slidably connected into the fixed shell, an electric control motor is fixedly connected into the fixed shell, the fixed shell is provided with a gearbox, the fixed shell is rotationally connected with a first gear with a gear shaft, and the first gear is provided with a gear shaft. And gear shafts of the first gears penetrate through the adjacent fixed shells and are provided with fans. The adjacent heat dissipation plates are covered through the fixed shell, multi-stage heat dissipation is carried out on the unit through the fan, noise generated when the power of the unit generator is increased is prevented from being increased and discharged through the heat dissipation plates, and therefore real-time automatic balance is carried out on heat dissipation and noise reduction of the unit generator; and maximum noise reduction is provided for the unit generator while the most energy-saving heat dissipation is maintained.

The utility model discloses a novel anti-crystallization nozzle structure, which relates to the technical field of urea nozzles and comprises an exhaust pipe, a nozzle body is fixedly mounted in the middle of the top of the exhaust pipe, a heat preservation mechanism is fixedly mounted at the top of the exhaust pipe, and a heat conduction mechanism is fixedly connected to the outer surface of the exhaust pipe. By the adoption of the structure, the heat preservation mechanism and the heat conduction mechanism cooperatively operate, when a vehicle runs, the heat absorption coil pipe is sleeved outside the high-temperature exhaust pipe, heat of the exhaust pipe is efficiently conducted to the heat conduction medium in the coil pipe, the heated medium naturally ascends and flows into the heat preservation tank based on the heat rising and cold falling characteristics, and automatic temperature rising during running is achieved; the micro pump is started to pump the heated heat-conducting medium in the heat-insulating tank to the heat-conducting coil pipe, the heat-conducting coil pipe transfers heat to the heat-conducting sleeve to preserve heat of the nozzle body, crystallization in the nozzle caused by sudden drop of external temperature is effectively avoided, normal use and stable performance of the nozzle are greatly guaranteed, and reliable operation of the whole system is guaranteed.

The invention relates to the technical field of engines, and provides a three-way catalyst fault diagnosis method and device and electronic equipment. Comprising the steps of entering a fault diagnosis mode under the condition that a fault diagnosis condition is met; the air-fuel ratio is adjusted, and signal changes of the front oxygen sensor and the rear oxygen sensor are monitored; based on the signal change, acquiring an oxygen storage amount measurement parameter; calculating a three-way catalyst performance monitoring index based on the oxygen storage amount measurement parameter; and if the three-way catalyst performance monitoring index is not lower than the preset diagnosis threshold value, it is determined that the three-way catalyst is normal. Fault diagnosis can be carried out on the three-way catalytic converter, so that whether the purification performance of the three-way catalytic converter meets the requirement or not can be judged, and emission performance control of an engine is facilitated.

The invention discloses a diesel generating set capable of recovering waste heat, and relates to the technical field of generator heat recovery, the diesel generating set comprises a filtering structure and a tail gas heat absorption structure, the filtering structure comprises a filtering box, a tail gas filtering plate is elastically arranged in the filtering box, and the filtering box is further fixedly communicated with a transmission bent pipe; the tail gas heat absorption structure comprises a cooling box, the end, away from the cooling pipe, of the water outlet pipe communicates with the cooling box, a gas inlet pipe and a gas outlet pipe are rotationally connected to a top plate and a bottom plate of the cooling box in a penetrating mode correspondingly, and a heat dissipation pipe fixedly communicates between the gas inlet pipe and the gas outlet pipe. The end, located on the outer side of the cooling box, of the air inlet pipe is rotationally connected with the end of the conveying bent pipe. Heat dissipated during working of the generator body can be recycled and stored in the cooling box in a warm water mode, and waste heat in tail gas is used for further heat preservation and heating of water in the cooling box.