75results about How to "Increased load range" patented technology

An engine (10, 100) utilizes “regular EGR cooling” when operating in HCCI mode within a low load range and “enhanced EGR cooling” that allows the engine to continue to operate in HCCI mode when engine load increases beyond the low load range. When engine load increases to a high load range, the combustion mode changes over to conventional diesel combustion, and exhaust gas recirculation reverts to “regular EGR cooling”. In a first embodiment, cooling is provided by two heat exchangers, one being a regular EGR cooler always used when cooling is needed and the other, an enhancing EGR cooler that is selectively used. In a second embodiment, cooling is also provided by two heat exchangers, one being an EGR cooler through which liquid coolant always flows when cooling is needed, and the other being a radiator used selectively to cool the liquid coolant before it enters the EGR cooler.

The invention discloses a wide-range bidirectional conversion circuit and a control method. The wide-range bidirectional conversion circuit comprises a three-stage bidirectional converter and a control unit, and the three-stage bidirectional converter is formed by sequentially connecting a non-isolated DC/DC converter, an isolated DC/DC converter and a DC/AC inverter. When the system works in theforward direction, a direct-current power supply or energy storage equipment realizes grid-connected energy feedback through the non-isolated DC/DC converter, the isolated DC/DC converter and the DC/AC inverter; and during reverse working, an alternating voltage supplies power to a direct-current load or charges an energy storage device through a rectifying circuit, the isolated DC/DC converter and the non-isolated DC/DC converter. In order to adapt to different power levels and realize higher input current ripple control, the non-isolated converter adopts a multi-phase interleaved parallel structure; and in order to further broaden the requirements of input and output ranges in practical application, the isolated converter can be controlled by adopting a full-bridge/half-bridge variable structure. The whole system has the advantages of wide input direct-current voltage range, wide output alternating-current voltage range, wide load range, small current ripple, high-frequency isolation, high efficiency, energy conservation, environmental protection and the like.

In a multi-mode, 2-stroke/4-stroke internal combustion engine operation, by switching the engine stroke from 4-stroke operation to 2-stroke operation so that the combustion frequency is doubled, doubling of the engine power is achieved even at the same work output per cycle. In order to meet the demand of extremely high power, the engine operates in 4-stroke boosted SI operation transitioned from 2-stroke HCCI operation at pre-set level of power and crank speed requirements. By combining the multi-stroke (2-stroke HCCI and 4-stroke HCCI) and multi-mode operation (2-stroke HCCI and 4-stroke boosted SI operation), full load range and overall high efficiency with minimal NOx emission are achieved.

Adaptable systems for a surface pumping unit that includes a low inertia pumping unit mechanism having a pneumatic counterbalance assembly are described, as well as methods for the use of such systems for subterranean fluid recovery. The system is capable of being integrated with well management automation systems, thereby allowing for response to active control commands, and automatically altering and/or maintaining a counterbalance force in the pumping unit by adding or removing air mass from a containment vessel associated with the pumping unit.

The invention discloses a DC-DC control circuit with wide range of load current, which comprises a P-type power tube (MP), a sampling circuit tube (MPs) of the P-type power tube, a current sense resistor (Rsense), an N-type power tube (MN), an inductance (L), a load (RL), a load capacitance (CL), divider resistances R1 and R2, an error amplifier (ea), a detection circuit (ea sensor) of the error amplifier, a first comparator (comp), a resistance R3, an RS trigger, buffer circuits (buffer 1 and buffer 2) a current conversion circuit (current convertor), a voltage and current conversion circuit (V-I convertor), a summation arithmetic unit and a current detection amplifier amp, wherein the resistance R3 is used for converting current into voltage. The DC-DC control circuit overcomes the defect of the traditional control circuit and greatly widening the range of the load current.

The invention discloses a flue gas desulfurizing tower, which comprises a tower body. A desulfurized slag outlet, a poking opening and a flue gas inlet are arranged on the lower part of the tower body; a returning ash inlet, a desulfurizer inlet and a nozzle port are arranged in the middle of the tower body; a flue gas outlet is arranged on the upper end of the tower body; and a desulfurizing tower outlet necking section is arranged between the desulfurized slag outlet and the flue gas inlet. The flue gas desulfurizing tower is characterized in that: an annular air distributing device is arranged on an internal sloping face of the necking section and is provided with an air outlet with the wind direction sloped upwards. According to the flue gas desulfurizing tower, the air distributing device is arranged on the necking section, so that fly ash falling from the tower is blown to be remixed with the flue gas, not only can the fly ash be blown, but also the fluency of distribution in the tower can be improved through the action of airflow, and the desulfuration efficiency is improved.

A reinforced panel (1) comprising: a composite skin (2); a plurality of stringers (3, 4) bonded to the skin; and one or more strain actuators (5), each positioned between an adjacent pair of stringers. A load is applied to the panel in the plane of the skin, and a local strain is applied to the skin by the strain actuators when the compressive load exceeds a predetermined threshold. This causes the skin to buckle and reduce interface stresses between the skin and the stringers.

A method for operating a gas and steam turbine system having a gas turbine, a steam turbine and a waste heat steam generator is provided herein, wherein steam for the steam turbine can be generated in the exchange of heat with exhaust gas from the gas turbine. Absorption capacity of the steam turbine can be increased and pressure in the waste heat steam generator can be lowered to utilize storage reserves in the waste heat steam generator for increased generation of steam to assist the frequency in the power system starting from a steady-state operating mode. Thermal energy is fed to the waste heat steam generator wherein a power profile of the gas and steam turbine system is greater than or equal to a preceding power level of the steady-state operating mode to increase the absorption capacity of the steam turbine and reduce pressure in the waste heat steam generator.

A rotating modulation radial spherical permanent-magnet biased magnetic bearing mainly comprises a stator system, a rotor system and a rotating modulation system, wherein the stator system mainly comprises upper spherical stator cores, lower spherical stator cores, field coils, magnetism isolating rings, upper magnetic-conductive rings, lower magnetic-conductive rings, permanent magnets, a stator sleeve and stator locking nuts; the rotor system mainly comprises spherical rotor cores, a rotor sleeve and rotor locking nuts; and the rotating modulation system mainly comprises a magnetic bearing stator mounting plate, a rotating modulation rotor bearing sleeve, rotating modulation bearings, rotating modulation rotor locking nuts, an ultrasonic motor rotor, an ultrasonic motor stator, a rotating modulation stator bearing sleeve and rotating modulation stator locking nuts. The rotating modulation radial spherical permanent-magnet biased magnetic bearing has the rotating modulation function, the stator is driven to rotate by the ultrasonic motor, and angular rate errors of the rotor, caused by gyro drift, are eliminated, so that the control precision of the magnetic bearing is improved.

The invention provides a control system for the flue gas oxygen content of a layer combustion boiler based on flue gas recirculation. The control system is mainly composed of the layer combustion boiler, a blower, a flue gas recirculation fan, a zirconium oxide analyzer, an air pipe, a DCS system (or a PLC system) and the like, and can be widely applied to the field of combustion control and combustion optimization of layer combustion boilers. The control system adopts conventional equipment, performance is reliable and stable, stable operation of the boiler under the very low load (the 30% rated load) can be achieved, ash accumulating of the heating surface of the tail of the boiler is reduced, the initial discharge concentration of boiler nitrogen and oxygen compounds can be reduced by 15-20%, and the heat efficiency of the boiler under the low load is improved by 5% or more.

To provide a polishing apparatus capable of avoiding an overshoot with respect to a target load at the time of polishing, which is caused when position control is switched to load control in the polishing apparatus of a type where a polishing body is supported by a head via an elastic mechanism.

A polishing apparatus includes: a holding section that holds a material to be polished; a polishing body that polishes the material to be polished held by the holding section; a head that supports the polishing body via an elastic mechanism; a driving mechanism that causes the head to be moved in a Z coordinate direction; a control unit that controls the driving mechanism; and a position sensor that measures a position of the polishing body with respect to the head. The load control is performed based on a measurement value of the position sensor and a spring constant value of the elastic mechanism.

The invention discloses a pseudo continuous conduction mode switch converter set follow current duty ratio control method and an apparatus. Through comparing a ripple voltage signal on an output capacitance equivalent series resistor to an error signal generated by an output voltage and a reference voltage which pass through an error amplifier, control to a main switch tube of a pseudo continuous conduction mode switch converter is completed and voltage stabilization of the output voltage is realized. Through carrying out set follow current duty ratio control on a follow current switch tube, dynamic follow current of an inductive current is realized. By using the method and the apparatus of the invention, the pseudo continuous conduction mode switch converter possesses the advantages that control is simple; stability is good; a load scope is wide; a light load output voltage ripple is small; input and a load transient response speed are fast; and full-load efficiency is high and so on.

The invention discloses a rock-soil model three-dimensional loading test system based on an underground lifting platform. The system comprises a model box and a three-dimensional loading system, and the three-dimensional loading system comprises a rectangular foundation pit, wherein a rectangular horizontal loading frame is arranged in the rectangular foundation pit, and a platform for placing the model box and a driving mechanism for driving the platform to ascend and descend are arranged between stand columns of the horizontal loading frame, and a height-adjustable cross beam is further arranged between every two adjacent stand columns. A horizontal actuator with the transversely-adjustable position is installed on the cross beam; a height-adjustable main beam is arranged above the horizontal loading frame in a spanning manner; and a vertical actuator with the transversely-adjustable position is arranged on the main beam. The test system is designed on the basis of the underground lifting platform. Compared with a traditional test system, the system can select different test boxes according to different test items, adjust the position of the loading force in the three-dimensional direction according to the sizes of the test boxes, can be suitable for various tests and is high in applicability.