Abstract: The present disclosure relates to a detachable chair leg and a chair. The chair includes feet and a central support. The central support includes a support body and a plurality of mount portions, one side of the foot is provided with a mount groove. The mount portion is horizontally embedded in the mount groove, and a fastening assembly is provided between the foot and the central support to prevent the mount portion from removing laterally from the mount groove. The mount portion is provided with first limit portions, the foot is provided with second limit portions, at least one first limit portion is located at the outer side of the second limit portion along a longitudinal direction, the first limit portions and the second limit portions cooperate to form a longitudinal limit structure that prevents the foot from being separated from the mount portion in the longitudinal direction.

Abstract: Disclosed are a laminated beam slab and a preparation method thereof, belonging to the technical field of building structures. The laminated beam slab includes an intermediate layer, where the intermediate layer has protective layers arranged on both upper and lower sides, and the intermediate layer and the protective layers are provided with reinforcing cages inside; partition plates are arranged between the intermediate layer and an upper protective layer as well as a lower protective layer, the intermediate layer forms a mutually occluding mortise-and-tenon shape with a side opposite to the protective layers; the reinforcing cages have prestressing tendons and stirrups arranged penetrating through the partition plates in the intermediate layer and the protective layers; the preparation method includes steps of: prefabricating partition plates; binding reinforcing cages; installing formworks; fixing the reinforcing cages; and casting an intermediate layer and protective layers.

Abstract: The present disclosure relates to a detachable chair leg and a chair. The chair includes feet and a central support. The central support includes a support body and a plurality of mount portions, one side of the foot is provided with a mount groove. The mount portion is horizontally embedded in the mount groove, and a fastening assembly is provided between the foot and the central support to prevent the mount portion from removing laterally from the mount groove. The mount portion is provided with first limit portions, the foot is provided with second limit portions, at least one first limit portion is located at the outer side of the second limit portion along a longitudinal direction, the first limit portions and the second limit portions cooperate to form a longitudinal limit structure that prevents the foot from being separated from the mount portion in the longitudinal direction.

Abstract: An adaptive method is used for LNT desulfation and regeneration. The desulfation method involves adapting the amount of sulfur loading to trigger a desulfation event in accordance with the current adsorption capacity of the LNT. The method involves monitoring the current sulfur loading and the current LNT adsorption capacity. This data is used to calculate a loading amount “trigger”, whose value varies over the LNT lifetime. Whenever this trigger amount is reached, a desulfation event is performed. The regeneration method is similar, with the baseline data and loading threshold being determined by NOx loading rather than sulfur loading.

Abstract: An adaptive method is used for LNT desulfation and regeneration. The desulfation method involves adapting the amount of sulfur loading to trigger a desulfation event in accordance with the current adsorption capacity of the LNT. The method involves monitoring the current sulfur loading and the current LNT adsorption capacity. This data is used to calculate a loading amount “trigger”, whose value varies over the LNT lifetime. Whenever this trigger amount is reached, a desulfation event is performed. The regeneration method is similar, with the baseline data and loading threshold being determined by NOx loading rather than sulfur loading.

Abstract: The present disclosure relates to a method or apparatus for controlling reductant dosing level introduced to a selective catalytic reduction device. The method or apparatus may determine available reductant and determine a distance to a source of reductant. This may be followed by adjusting a reductant dosing level based upon the available reductant and the distance to the reductant source. The apparatus may be installed in a vehicle and may also regulate in-cylinder emission control variables to reduce NOx emissions.

Abstract: A method and apparatus for regenerating exhaust treatment devices. Incomplete combustion products may be selectively provided in at least one cylinder of multi-cylinder internal combustion engine. This may then be followed by directing the products to an engine exhaust treatment device. The temperature of the engine exhaust treatment device may then be increased due to exposure to the products of incomplete combustion. The catalyst in the converter may then be regenerated due to the temperature increase.

Abstract: A diesel engine exhaust treatment system has both a NOx reduction device and a diesel particulate filter. The system is designed to ensure that the NOx reduction device operates within its optimal temperature conditions. Using exhaust flow control valves, the exhaust flow can be directed into either the NOx reduction device first or into the diesel particulate filter first, and then into the other device, before exiting out the tailpipe.

Abstract: A reconfigurable exhaust system provides selective positioning of exhaust gas treatment devices either near, or spaced from, the exhaust gas outlet port of a turbine of a turbocharged Diesel engine. In some embodiments, auxiliary air or a heat exchanger are arranged to cool the exhaust gas when required.

Abstract: The present disclosure relates to a method or apparatus for controlling reductant dosing level introduced to a selective catalytic reduction device. The method or apparatus may determine available reductant and determine a distance to a source of reductant. This may be followed by adjusting a reductant dosing level based upon the available reductant and the distance to the reductant source. The apparatus may be installed in a vehicle and may also regulate in-cylinder emission control variables to reduce NOx emissions.

Abstract: A diesel engine exhaust treatment system has both a NOx reduction device and a diesel particulate filter. The system is designed to ensure that the NOx reduction device operates within its optimal temperature conditions. Using exhaust flow control valves, the exhaust flow can be directed into either the NOx reduction device first or into the diesel particulate filter first, and then into the other device, before exiting out the tailpipe.

Abstract: A method and apparatus for regenerating exhaust treatment devices. Incomplete combustion products may be selectively provided in at least one cylinder of multi-cylinder internal combustion engine. This may then be followed by directing the products to an engine exhaust treatment device. The temperature of the engine exhaust treatment device may then be increased due to exposure to the products of incomplete combustion. The catalyst in the converter may then be regenerated due to the temperature increase.

Abstract: A method and system for controlling exhaust gas temperature at a diesel particulate filter during regeneration. The temperature rise is controlled at a rate that will prevent harm to the filter caused by high temperatures and rapid increases.

Abstract: Intake air is restricted to provide an intake manifold pressure that is below the pressure of the ambient atmosphere. Fuel is injected into each combustion chamber at a position of between 15° and 45° BTDC to achieve HCCI combustion under idle and light load operating conditions.

Abstract: A reconfigurable exhaust system provides selective positioning of exhaust gas treatment devices either near, or spaced from, the exhaust gas outlet port of a turbine of a turbocharged Diesel engine. In some embodiments, auxiliary air or a heat exchanger are arranged to cool the exhaust gas when required.

Abstract: Uncontrolled regeneration in a Diesel particulate filter is prevented by controlling the concentration and mass flowrate of oxygen passing through the Diesel particulate filter during regeneration.

Abstract: A reconfigurable exhaust system provides selective positioning of exhaust gas treatment devices either near, or spaced from, the exhaust gas outlet port of a turbine of a turbocharged Diesel engine. In some embodiments, auxiliary air or a heat exchanger are arranged to cool the exhaust gas when required.

Abstract: A method for rapidly transitioning from a lean combustion mode to a rich combustion mode, such as often required for the regeneration of aftertreatment devices, is provided by abrupt intake air reduction and a concurrent abrupt increase in fuel injection quantity with accompanying retardation of fuel injection timing. The abrupt increase in fuel quantity is to a maximum value sufficient to immediately provide a defined initial rich air/fuel ratio for a coexistent oxygen concentration in the cylinder. The fuel quantity is then proportionally reduced from the maximum value to a target fuel quantity to maintain a target air/fuel ratio during the transition. Simultaneously, injection timing is abruptly retarded to a value sufficient to avoid torque increase as a result of the increased injected fuel. The injection timing is subsequently proportionally advanced from the abruptly retarded timing value when the target fuel quantity and air/fuel ratio values are achieved.

Abstract: Intake air is severely restricted during cold start of a diesel engine to provide high engine-out exhaust gas temperatures and quickly heat exhaust treatment devices. Cylinder pressures are maintained substantially below the pressure of the ambient atmosphere during a principal portion of the intake stroke of each combustion cycle to promote rapid fuel vaporization and higher combustion temperatures. The engine is operated in a premixed charge compression ignition combustion mode to provide a high engine-out exhaust temperature, stable combustion, and low emissions during the cold start period.

Abstract: High exhaust gas temperatures whereby sulfur is removed from a lean NOx traps simultaneously with regeneration of a Diesel particulate filter is provided by alternating engine operation in respectively defined lean and rich combustion modes. The duration and frequency of the respective lean and rich operating modes, as well as the air/fuel ratio during the respective modes, are preferably controlled by the sensed temperature of the lean NOx trap substrate.