摘要:
The invention provides a process for reducing the amounts of carbon monoxide, hydrocarbons and soot particles in the lean exhaust gas from an internal combustion engine using a particle filter, wherein the soot particles have a soot ignition temperature TZ and the particle filter is regenerated from time to time by raising the temperature of the particle filter to above the soot ignition temperature and burning the soot particles, wherein the temperature of the filter is increased to the temperature required to initiate soot ignition by burning additional fuel on the catalytic coating when the exhaust gas back pressure reaches a predetermined value. The process is characterised in that the particle filter is provided with a catalytic coating comprising a first group of components for reducing the ignition temperature of soot, said first group of components contains at least one oxygen storage component and at least one platinum group metal selected from the group consisting of platinum, palladium and rhodium. In a preferred embodiment of the process the catalytic coating further comprises a second group of components for oxidising carbon monoxide and hydrocarbons, said second group of components comprises at least a support material selected from the group consisting of aluminium oxide, silicon oxide, titanium oxide, zirconium oxide and zeolite and at least one platinum group metal selected from the group consisting of platinum, palladium and rhodium deposited on said support materials.
摘要:
A method for producing a metallic honeycomb body includes providing a plurality of smooth sheet-metal foils and at least partly structured sheet-metal foils and placing the foils in a housing. The smooth sheet-metal foils have a first length while the structured sheet-metal foils have a second length. A difference between the first length and the second length is selected in accordance with a prestress.
摘要:
Method for monitoring insulin medication in which blood sugar values are determined before and after a meal. The difference between these measured values is plotted against a quotient calculated from the bread units ingested during the meal and the insulin units used to compensate for these bread units. Displaying many such points on a graph provides criteria for improving the insulin medication.
摘要:
A transfer device for books, inner books, newspapers, stacks or papers or similar products that are fed to a distribution point in a product stream on a high speed conveyor which includes a rotationally driven accelerator/decelerator. The speed of the accelerator/decelerator is controlled in such a manner that the product to be distributed is first accelerated to separate it from the next succeeding product in the product stream and the product is then controllably slowed so that it may be stopped at the distribution point without damage.
摘要:
A device for separating an imbricated formation (2) of continuously conveyed printing products (1) into a succession of spaced printing products (1), comprises a first conveyor (3) driven at a first velocity (v1), a second conveyor (4) arranged after the first conveyor (3) and driven at a second velocity (v2) which is higher in relation to the first velocity, and a de-imbricating device (5, 6) for accelerating the leading printing product (1) of the imbricated formation (2) to the second velocity (v2) and for maintaining the imbricated arrangement of the following printing products (1) being conveyed in the imbricated formation (2) at the first velocity (v1). The de-imbricating device comprises two suction belt conveyors (5, 6), the first suction belt conveyor (5) driven at the first velocity (v1), that the second suction belt conveyor (6) is driven at the second velocity (v2). The first suction belt conveyor (5) has a suction field (7) which is displaceable along the feed direction (F) with respect to the format height (H) of the printing products (1) and the second suction belt conveyor (6) has a suction field (8) which is arranged at the start of the suction belt conveyor (6), as seen in the feed direction (F).
摘要:
A catalyst for purifying the exhaust gases from diesel engines. The catalyst contains a zeolite mixture of several zeolites with different moduli and platinum group metals as well as further metal oxides from the group aluminum silicate, aluminum oxide and titanium oxide, wherein the aluminum silicate has a ratio by weight of silicon dioxide to aluminum oxide of 0.005 to 1 and the platinum group metals are deposited on only the further metal oxides.
摘要:
A projecting device, particularly for use in photogrammetry, employs a Fresnel condensor for illuminating a picture carrier which is imaged through an objective, including a diaphragm, onto a projection table. At least half of the illumination rays entering said objective, is suppressed by said diaphragm. The Fresnel condensor and the severe stopping-down of the objective produce interfering chromatical effects on the projection table. Said chromatical effects are eliminated either by means of a bi- or multifocal embodiment of the Fresnel lens or by insertion of optical means which extend the optical illumination path or by a respective embodiment of the light source.
摘要:
The invention is directed to a motor-driven chain saw having a drive motor arranged in a housing. The drive motor drives a saw chain on a guide bar via a sprocket wheel. The guide bar extends forwardly in the longitudinal direction of the chain saw and has an elongated slot in its rearward end facing toward the housing. Stud bolts fixed on the housing extend through the elongated slot in a direction transverse to the longitudinal direction of the chain saw. The rearward end of the guide bar is clamped between the housing and a sprocket-wheel cover through which the stud bolts extend. A holding device separate from the sprocket-wheel cover is provided at the rearward end of the guide bar for holding the rearward end of the guide bar in its position on the housing when the sprocket-wheel cover is removed. This holding device reliably holds the guide bar for mounting the saw chain.
摘要:
The invention relates to an exhaust gas muffler for a two-stroke engine of a portable handheld tool such as a chain saw. The exhaust gas muffler includes a catalyzer wherein high exhaust gas temperatures are developed because of the exothermal reaction which takes place therein. The catalyzer is located in the forward portion of a gas-tight hollow body mounted in the housing of the muffler. The hollow body has a tapered portion which extends out of the housing in the direction of the exhaust gas flow. In this way, the surface temperature of the muffler housing is reduced.
摘要:
A process is disclosed for operating an exhaust gas treatment unit for an internal combustion engine which is operated with lean normalized air/fuel ratios over most of the operating period. The exhaust gas treatment unit contains a nitrogen oxides storage catalyst with an activity window .DELTA.T.sub.NOX for the storage of nitrogen oxides at normalized air/fuel ratios of greater than 1 and release of the nitrogen oxides at normalized air/fuel ratios of less than or equal to 1 and a sulfur trap, located upstream of the nitrogen oxides storage catalyst, with a sulfur desorption temperature T.sub.S,DeSOx above which the sulfates stored on the sulfur trap are decomposed at normalized air/fuel ratios of less than or equal to 1. The nitrogen oxides contained in the exhaust gas are stored on the nitrogen oxides storage catalyst and the sulfur oxides are stored on the sulfur trap at normalized air/fuel ratios greater than 1 and exhaust gas temperatures T.sub.K within the activity window T.sub.NOX, wherein at the same time the exhaust gas temperature just upstream of the sulfur trap is lower than its sulfur desorption temperature T.sub.S,DeSOx. By cyclic lowering of the normalized air/fuel ratio in the exhaust gas to less than 1 the stored nitrogen oxides are released again from the storage catalyst. After each predetermined number N.sub.1 of nitrogen oxides storage cycles, sulfur is removed from the sulfur trap. This takes place by raising the exhaust gas temperature just upstream of the sulfur trap to above its sulfur desorption temperature T.sub.S,DeSOx and also lowering the normalized air/fuel ratio in the exhaust gas to less than 1.