115results about How to "Reduce surge" patented technology

A method for load control in an electrical distribution system using energy usage profiles based on temporal measurements. A load control unit (10) installed at a customer site profiles equipment (E1-En) directly connected to the load control unit and remotely located equipment (RE1-REn) wirelessly connected to the load control unit using measurements of time rather than energy usage. This reduces the cost and complexity of the load control unit. Profiling is done for individual pieces of load controlled equipment rather than for the site as a whole. This improves data resolution. The load control unit controls the load only when the equipment is powered, and adaptively synchronizes load shedding during this time, so to improve local load control performance. Termination of a load control event results in gradual reduction in load shedding so to control the inrush of demand seen by the distribution system. Performance metrics related to the load control are provided to the utility such that complexity of the system is reduced through decreased computations.

A semiconductor module is provided which is capable of lowering surges caused when switching elements are switched on and off. The module has a plurality of lead frames, switching elements, electronic components, and a sealing member. The switching elements are electrically connected to the lead fames respectively. Part of the lead frames, the switching elements, and the electronic components are sealed by the sealing member. The electronic components are mounted on primary surfaces of the lead frames respectively.

A transport tank system includes a molded thermoplastic tank defining an aperture therethrough and having a discharge end and an opposing end, the thermoplastic tank being rigidly configured for holding a consumable cargo received through the aperture and including a material resistant to passage of oxygen to preserve the consumable cargo. The tank is capable of standing alone for storing the consumable cargo, or the tank can be loaded into a standard dry box container to convert the dry box container into a bulk liquid transport container.

Systems and methods for supplying air to an engine are disclosed. In one example, an air inlet throttle is at least partially closed in response to a change in engine torque request. In another example, the air inlet throttle is adjusted in conjunction with adjusting an engine throttle. The approach can reduce compressor noise and may reduce the possibility of compressor surge.

The method comprises: in term of the size of transmitting data, the data transmitting unit predicts the load of currently-used data process unit, and selects a data process unit with minimum traffic load to transmit data; if there are two data process units both simultaneously having minimum loads, the data transmitting unit selects the one having minimum data size in current cycle to transmit data; if there are two data transmitting units both having minimal data size in current cycle, then using a recurrent selection approach to determine one data transmitting unit to transmit data. The invention can balance the traffic load of data processing unit.

There is disclosed a downhole packer for use in a well bore, and in particular, a packer which can be used for downhole testing. In an embodiment of the invention, a packer tool (10) for mounting on a work string to provide a seal against a tubular (32) is disclosed, the packer tool comprising a body (12) with one or more packer elements (18) and a sleeve (14), the packer tool being set by movement of the sleeve relative to the tool body compressing the one or more packer elements, wherein the tool has a plurality of bypass channels (16) to provide a fluid path past the packer elements, the sleeve including at least owe anchoring member (22, 50), the at least one anchoring member being actuate to contact the tubular by fluid pressure from the bypass channels when the packer is set.

An engine system is provided. The system comprises an engine, first and second compressors supplying air to the engine, a first compressor recirculation valve adjustable to two restriction levels, and a second compressor recirculation valve adjustable to three or more restriction levels. In this way, the first and second compressor recirculation valves may be controlled to avoid compressor surge while providing a sufficient amount of boost to meet power demands.

A method of controlling an engine having an intake manifold and an exhaust manifold, wherein an exhaust gas recirculation path having a valve is provided between the intake and exhaust manifolds, and the engine has a turbocharger ; the method comprising increasing the opening of the exhaust gas recirculation valve when there is at least one condition of reduced engine output; and adjusting exhaust gas expansion through the turbocharger turbine to reduce expansion through the turbocharger. Reducing turbocharger expansion will reduce the power input to the compressor and slow down the compressor. At the same time, the pressure differential between the intake and exhaust manifolds increases due to the reduced pressure on the exhaust manifold side (because of the reduced expansion). Therefore, more airflow from the intake side can flow into the exhaust side for efficient exhaust to the intake manifold. As a result, the pressure at the outlet of the compressor is further reduced. Thus, such manipulation can reduce the likelihood of surge through the synergistic effect of the two actions.

The invention discloses a segmented resistance type IGBT driving circuit, which is characterized in that a segmented resistor driving circuit comprises a plurality of segmented resistors which are connected in series, both ends of each segmented resistors are connected with a bypass MOS transistor in parallel; each bypass MOS transistor and a driving push-pull circuit are connected with a driving controller; and an IGBT gate clamping circuit comprises an IGBT gate voltage-stabilized clamping circuit and an IGBT gate power supply clamping circuit. The invention further discloses a control method of the segmented resistance type IGBT driving circuit, which is characterized in that a pulse rising edge and a falling edge are driven at the gate, and the size of the gate driving resistance is changed through switching of the bypass MOS transistors. The segmented resistance type IGBT driving circuit and the control method thereof can achieve the purposes of reducing the switching loss of an IGBT device and improving the application frequency of the device while ensuring suppression for surge and gate oscillation.

The invention discloses an FPSO ship. The total length of a ship body is 310m to 330m; the molded breadth is 60m to 65m; the moulded depth is 30m to 35m and the maximum draft is 20m to 25m; from a stern to the other stem of the ship body, the ship body sequentially comprises a living building, a main power station, a power distribution module, a heat station module, a process system module, an oil gas processing and metering module and a flare tower, wherein four mooring sites are symmetrically arranged at the left and right boards of the stern and the other stem of the FPSO ship in total; the left and right boards of the stern are respectively and symmetrically provided with a set of external oil transportation device. According to the FPSO ship, the principle dimension of the ship body meets the oil storage capacity of an oil hold of the FPSO ship and the demands of an upper part module, as well as that the functions implemented are adaptive to the ship type; furthermore, the layout of the stem, the middle part of the ship and the other stem meets the living and operating demands of personnel; in addition, by adopting the multi-site mooring, the maximum tension of a mooring line of the mooring system and the maximum operating response of the ship body can be controlled better; and the external oil transportation device can be set to prevent the danger of being impacted with the FPSO ship.

A valve train of an internal combustion engine equipped with a valve reciprocated by a cam is equipped with a spring seat manufactured in order to prevent the surging of a coil spring. A spring seat having a squeeze film effect of damping the axial motion of a coil spring is provided at one end of the coil spring in a closing direction. The spring seat is configured to be provided with an oil slit which radially intersects and extends helically around a valve axis.

A transport tank system includes a molded thermoplastic tank defining an aperture therethrough and having a discharge end and an opposing end, the thermoplastic tank being rigidly configured for holding a consumable cargo received through the aperture and including a material resistant to passage of oxygen to preserve the consumable cargo. The tank is capable of standing alone for storing the consumable cargo, or the tank can be loaded into a standard dry box container to convert the dry box container into a bulk liquid transport container.

The invention discloses a primary draught fan automatic parallel method and system for a thermal generator set. The method comprises the following steps that whether a draught fan needs to be automatically in parallel is judged according to the running information of a primary draught fan of the set, when the primary draught fan is required to be automatically in parallel, an air door baffle interlocking logic of a primary air system is forced to be parallel, a load of a boiler and the primary air pressure are adjusted, and the automatic parallel condition of the draught fan is met; a target value of the opening degree of a movable blade of the primary draught fan which needs to be in parallel is calculated and input, and a target value of the opening degree of a movable blade of a runningdraught fan; after the draught fan is parallel, the draught fan current deviation value is calculated, and the draught fan is judged to be successful to be parallel. According to the method, manual operation of the draught fan parallel process can be reduced, the flow of the draught fan parallel process is solidified, and the main protection tripping risk of the boiler caused by the draught fan stopping, surge and wind pressure large fluctuation in the draught fan parallel process is avoided.

An anti jerk control system and method of an eco-friendly vehicle are provided to prevent a driver from sensing a difference in vehicle starting at an initial stage when the vehicle is parked on a downhill road. The anti-jerk control method uses a motor as a driving source and includes calculating an actual speed of the motor, calculating a model speed of the motor, and acquiring a gradient of a road, on which the vehicle is located, using a gradient detector. Additionally, the method includes determining a speed offset value that corresponds to the acquired gradient, compensating the model speed by the speed offset value, and calculating a motor vibration component using a difference between the compensated model speed and the actual speed of the motor. Then, anti-jerk compensation torque is calculated using the calculated motor vibration component.

The invention provides a fuel cell air circuit. The fuel cell air circuit comprises a fuel cell stack, an air compressor arranged on the intake pipe of the fuel cell stack, and a pumping device whichis arranged on the exhaust pipe of the fuel cell stack. The pumping device is used for extracting gas in the fuel cell stack. According to the invention, the pumping device is arranged on the exhaustpipe of the fuel cell stack; when the air compressor has a surge phenomenon, unreacted gas in the fuel cell stack can be discharged in time by turning on the pumping device; gas flow resistance and pressure drop in the fuel cell stack are reduced; the surge of the air compressor is prevented; normal operation of a fuel cell engine is ensured; and the impact of surge on the service life of the aircompressor is reduced. The embodiment of the invention further discloses a pumping device control method and a controller.

The invention discloses a car washing pool and an assembling method thereof. The car washing pool comprises a downhill part (1), a ponding part (2) and an uphill part (3), wherein the front end and the rear end of the ponding part (2) are respectively fixed with the uphill part (3) and the downhill part (1); two sides of the downhill part (1), the ponding part (2) and the uphill part (3) are respectively provided with a side wall (4); each side wall (4) consists of a front wall (4.1) and a rear wall (4.2); the ponding part (2) consists of a front ponding part (2.1) and a rear ponding part (2.2); the front ponding part (2.1), the uphill part (3) and two front walls (4.1) form an integral front half pool body, the rear ponding part (2.2), the downhill part (1) and two rear walls (4.2) form an integral rear half pool body, and the front half pool body and the rear half pool body are subjected to screw joint fixing. The method has the key that the front half pool body and the rear half pool body are prefabricated and then are transported to a construction site field to be assembled. The car washing pool and the assembling method have the advantage of convenient and quick installation and disassembling processes.