121 results about "Compression phase" patented technology

Systems and methods for enhancing circulation are described. In one particular embodiment, the invention provides a method for enhancing circulation. The method comprises attaching at least one compression device to at least a portion of a person's lower extremity. The person's chest is repetitively compressed so that the chest experiences a compression phase and a recoil phase or decompression. Also, the person's lower extremity is compressed using the compression device during at least some of the recoil phases.

A compression method, a multistage compression system and an air separation method and plant in which a gas is compressed in a series of compression stages to produce a compressed gas and each of the compression stages incorporate a variable speed compressor. In such compression method and system, the compressed air is produced at a pressure that remains stable during both normal operational conditions and during turn down conditions during which the flow rate of the gas is reduced. This reduction is accomplished by reducing the speed of the compressor in an initial compression stage such that the compressor operates at a point along its peak efficiency operating line at which the pressure ratio is directly proportional to the flow rate and such that the lower turn down flow rate is obtained at a reduced pressure which is made up in successive compression stages.

The problem during overrun fuel cut-off operations, i.e. cut-off of fuel injection during trailing throttle conditions of the vehicle, is that the transition entails an undue torque jump, resulting in the smooth operation of the engine and the driving comfort of the passengers of the vehicle being affected. The aim of the invention is to reduce the torque jump. Said aim is achieved by injecting fuel into a cylinder of the Otto engine in a multiple injection process, at least a partial quantity of the fuel that is to be injected being injected during the compression phase, whereby the quantity of air that is taken in advantageously decreases because no internal cooling takes place while the efficiency is advantageously reduced due to the lesser degree of swirling, resulting in lower torque. Overall, torque (DM) is reduced to a significantly greater extent than by merely adjusting the spark angle (ZW) while smooth operation of the Otto engine is not affected.

The invention relates to a method of regulating the temperature of a heat regenerator (ST1, ST2) used in an installation (10) for storing energy by adiabatic compression of air. The regenerator is subjected to successive operating cycles, each cycle comprising a compression stage followed by an expansion stage. Between two successive cycles, the method consists in cooling a bottom compartment (26a) of the layer of refractory material (26) of the regenerator that is situated in the proximity of the bottom distribution box (24) in order to bring the air leaving the heat regenerator to a temperature that is compatible with the range of temperatures required during the compression stages. The invention also provides such a heat regenerator.

A regulable dashpot with shock-absorption force controls, especially intended for motor vehicles, with at least one flow-regulating system including one or more shock-absorption components for the compression phase and/or for the decompression phase. The object is to allow the dashpot to shift continuously between the hard and soft phases, whereby the valve-adjustment intervals can be varied at intervals that are not unnecessarily short or even unattainable. At least one valve assembly is accordingly supplied with variable flow impedance by a regulating valve (5 or 6).

The invention relates to a system for calibrating apparatus (28) for acquiring the pressure in a cylinder (10) of a motor vehicle diesel engine, of the type comprising a cylinder pressure sensor (30) associated with the cylinder and means (32) for conditioning the signal delivered by the sensor (30) as a function of conditioning parameters. The calibration system comprises means (64) for collecting a signal delivered by the cylinder pressure sensor (30), an information processing unit (34) adapted to determine the values of the conditioning parameters as a function of a polytropic thermodynamic model of the evolution of the pressure in the cylinder, a reference pressure of the pure compression phase of the cycle of the cylinder, and the signal delivered by the pressure sensor (30) and collected by the collecting means (64), and means (66) for modifying the values of the conditioning parameters in the acquisition apparatus (28) as a function of the values of the conditioning parameters determined by the information processing unit (34).

The invention relates to an external mechanical induction type adjustable damping valve of an oil-gas suspension, which comprises an external mechanical induction type adjustable damping valve body, wherein an accumulator interface and an oil cylinder interface of the oil-gas suspension are arranged on the valve body; a mounting pole is arranged in the valve body, and a fixed valve and a floating valve are arranged on the periphery of the mounting pole; the floating valve is arranged between a compression limit spring and an extension limit spring in a suspended way; a fixed valve compression phase damping valve component and a fixed valve extension phase damping valve component are arranged at the two ends of the valve body of the floating valve respectively; a floating valve compression phase damping valve component and a floating valve extension phase damping valve component are arranged at the two ends of the valve body of the floating valve respectively; and a pre-stressing spring is arranged between a valve plate and a limit tray. The external mechanical induction type adjustable damping valve of the oil-gas suspension has the advantages that: the radiation is desirable; the outer diameter of a control valve element is small; the structure is simple; and the damping adjustment can be realized without electronic control system, and the reliability is high.

A method and to a device for operating a pressure reservoir, where during a compression phase in a pump chamber, a pump periodically increases the pressure of a fluid located therein, and by means of a discharge valve controlled by differential pressure fluid under high pressure is allowed to be introduced from the pump chamber into the pressure reservoir. During a decompression phase following a compression phase, fluid from a fluid reservoir is introduced into the pump chamber by means of a controllable intake valve. In order to be able also to operate the pressure reservoir without a high pressure measurement directly in the pressure reservoir, the fluid pressure in the pressure reservoir is ascertained by means of a pressure determination in the pump chamber. The pressure determination takes place indirectly, monitoring of the intake valve in the decompression phase.

The present invention provides an apparatus and method for enhancing the circulation to an extremity of a patient. During the compression phase, the extremity is compressed, pushing out superficial edema as well as emptying the superficial venous tree. The compression cycle is timed to begin at or slightly after the “P” segment of the heartbeat. Air slowly fills a boot so that it reaches maximum capacity just as the heart reaches the diastolic phase in the heartbeat. Since the heart is at its lowest pressure, there is little resistance from the heart, making it easier for the compression of the extremity to push fluids out into the venous structures carrying them back to the heart. When the heart reaches the next full beat, the extremity is void of some of the fluid, forcing from the heart fresh oxygenated blood into the extremity, thereby promoting circulation through the heart.

The invention discloses an isometric process control method utilizing PVT (pressure-volume-temperature) relation of polymers. An injection process includes a first step: a PVT curve of an injection molding material is obtained according to the category and the characteristics of the material, an A-B-C-D-E-F process route is obtained from the curve, and an A-B-C section is an injection molding stage; a second step: constant-pressure packing is realized under the maximum packing pressure for a period of time, then isometric packing is carried out, and a C-D section is an isobaric compression stage; a third step: a D-E section is an equal-ratio volume packing stage, a material in a cavity cannot be changed, and cannot backflow or be increased along with reduction of the temperature of the cavity, and packing pressure of melt is obtained by means of calculation by the aid of a Tait equation and physical parameters provided by a PVT database; and a final step: an E-F section is a constant-pressure cooling stage. The constant-pressure packing is realized before the equal-ratio volume packing is realized, the melt is in a flowing state during the constant-pressure packing, accordingly excessively packing alignment is avoided, warpage is low, and quality repeat precision is high.

The methods described allow for reducing particulate emissions from a direction injection engine during a starting phase, while also maintaining the engine start phase within a predetermined threshold. In one particular example, the methods comprise adjusting at least one of a fuel release pressure threshold and enrichment factor based on an engine condition; activating a starting device to rotate a crankshaft coupled to an engine cylinder without injecting any fuel; supplying fuel to the cylinder based on the enrichment factor only when a fuel pressure exceeds the fuel release pressure threshold; and stratifying a cylinder charge while adjusting a fuel injection within a compression phase and/or expansion phase of the engine. In this way, an amount of fuel injected may be evaporated in the combustion chamber while preventing a combustion wall wetting, which allows for reduced particulate emissions, particularly at reduced temperatures.

An internal combustion engine (10) is operated with a method wherein fuel is injected directly into a combustion chamber (12). The injection takes place at least from time to time so that, together with a corresponding supply of air into the combustion chamber (12), the air/gasoline mixture is present stratified in the combustion chamber (12). In order to reduce the gasoline consumption in the engine (10) via a higher compression ratio without the danger of knocking, it is suggested that the gasoline be injected exclusively and also at full load during the compression phase of the engine (12) by a multi-hole fuel injection device (22).