251results about How to "Improve startup" patented technology

A storage unit provided in an engine control device stores three kinds of mode maps having different engine output characteristics. One of the mode maps is selected in accordance with the driving conditions, and a target torque is set by referring to the selected mode map using an engine speed and an accelerator opening-degree as parameters. A throttle opening-degree signal corresponding to the target torque is output to a throttle actuator, and an operation of opening or closing the throttle valve is performed in response to the throttle opening-degree signal.

The invention discloses a quasi-close loop starting method of a brushless direct current motor free of a position sensor, namely a quasi-close loop three-stage starting method with rotor initial position accurate pre-positioning and optimization positioning in the acceleration process combined. Short-time pulse voltage vectors are exerted in a motor winding, the rotor position can be locked in a range within 60-degree electrical angles by detecting direct-current bus current, and rotor accurate pre-positioning is completed by electrifying a designated winding, detecting current and comparing the current on the basis of rotor position locking. After rotor position pre-positioning, rotors enter the optimization positioning and acceleration stage, current differentials serve as the phase change conditions in the threshold range so that the rotors are ensured to change phase accurately in the acceleration process, and a system is switched into a counter electromotive force operation state. Experimental results show that the quasi-close loop three-stage starting method is low in cost and high in reliability, and can ensure that the system is in the quasi-close loop working state in the whole starting process and cannot have step-out and starting failure.

The invention relates to a control method of low-speed stage starting of static frequency conversion starting of a pumped storage power station, comprising the following steps: calculating the initial position of a rotor; estimating each force commutation moment of a low-speed stage inverting bridge according to a preset constant acceleration value; electrifying an appointed two-phase winding at the unlocking moment of a frequency converter according to an interval to which the initial position of the rotor belongs; switching a rectifier bridge to an inversion run mode at the forced commutation moment, sending a trigger pulse to a thyristor bridge arm corresponding to the appointed two-phase winding according to an interval to which a rotor position angle belongs at the moment after a loop of a frequency converter is cut out and each bridge arm of the inverting bridge is reliably shut off, and simultaneously switching the rectifier bridge to a rectifying run mode, and ending single forced commutation; ending the low-speed run stage if the rotor speed is higher than or equal to 5 percent of specific speed of a machine set, and then switching to a natural commutation stage based on machine terminal voltage, or carrying out the forced commutation again; and if starting exceeds time, regulating the preset constant acceleration value, and then restarting until successful starting. The invention can realize rapid and reliable frequency conversion starting at the low-speed stage of the machine set of the pumped storage power station as long as a set value of the constant acceleration of machine set starting is regulated.

The invention relates to a shaftless propeller, which propeller may be made to cooperate with a liquid, comprising a stator having a circular opening and a rotor mounted in said opening and comprising an annular rotor body with a multiplicity of inwardly projecting propeller blades, wherein the bearings between the rotor and stator comprise a tiltable padded bearing. A propeller of this type is suitable for relatively high capacities and may be used for propelling a vessel, for pumping a liquid or for generating energy from a flow of liquid.

Systems and methods for delay in startup of multiple components such multiple disk drives in computer systems to stagger associated spikes in resource usage during the initial startup of each component are disclosed. A delay module generally includes a detector to detect signal quality between a power supply line and a system component, a delay generator, and a switch that opens upon detecting insufficient signal quality. The switch may open to disconnect the component from the power supply line upon detection of insufficient signal quality by, e.g., comparing the signal quality to a threshold or detecting signal stability during a predetermined time period. An iteration is performed for each successive detection of insufficient signal quality in which a back off or delay selected from a period that increases for each iteration may be applied.

A charge-injected internal combustion engine exhibits improved starting performance with charge-injection timing control. A charge-injected internal combustion engine has an air-fuel injection valve for directly injecting a compressed air-fuel mixture into a combustion chamber. The engine is also provided with an air pump, driven by the crankshaft for discharging compressed air, and a timing controller for setting injection timing of the air-fuel injection valve. When initial startup of the engine is detected, the controller sets the injection timing to the intake stroke. When the engine reaches a predetermined engine speed, or when the pressure of the injection air reaches a threshold pressure where injection of the air-fuel mixture is possible on the compression stroke, the timing controller switches the injection timing from the intake stroke to the compression stroke.

The invention belongs to hydraulic components and particularly relates to an electric hydraulic pump for vehicle power steering. The upper end and the lower end, where a race I (28), a race II (29), a driving gear (14) and a driven gear (24) are mounted inside respectively, of a hydraulic pump body (3) are movably mounted on the race I (28) and the race II (29) in a penetrating manner respectively; an oil filtration screen (25) is fixedly mounted below the position corresponding to an oil return port (12) in an oil can (1); a cross coupler (4) is connected with the lower end of the driving gear (14) and the upper end of a rotor shaft (15) respectively; the rotor shaft (15) is mounted in a casing (5) in a penetrating manner; a stator (18) is mounted in the casing (5); a rotor (17) is movably mounted in a cavity of the stator (18) in a penetrating manner; a motor front cover (16) and a cooling plate (9) are fixed on the casing (5) through bolts; a shaft head magnet (20) is fixedly mounted at the lower end of the rotor shaft (15); a controller (7) is fixedly mounted on the lower end surface of the cooling plate (9) through a controller front cover (8). The electric hydraulic pump for vehicle power steering is compact in structure, convenient to assemble, high in efficiency and low in noise.

A control system for a hybrid vehicle, in which an engine is connected to a first motor generator and to an output shaft through a power distributing mechanism (12), in which a second motor generator is connected to the output shaft through a transmission (6) wherein a torque capacity is varied in accordance with an oil pressure, and which has an electric oil pump (OPM) for generating an oil pressure, comprising: an oil pressure judging means for judging whether or not the oil pressure established by operating OPM is raised higher than a preset value; an electric oil pump output lowering device for lowering an output of OPM in case the oil pressure judging device judges that the oil pressure is raised higher than the preset value; and a cranking device for carrying out a cranking of E/G by the first motor generator.

An arc start control method comprises starting advance of a welding wire, and determining that a distal end of a welding wire contacts a base material and short circuit is caused. If a feed torque value is a reference torque value or greater, the welding wire is retracted and the distal end of the welding wire is separated from the base material without generating an arc. If the feed torque value is smaller than the reference torque value the welding wire is retracted and the distal end of the welding wire is separated from the base material and an initial arc is generated between the welding wire and the base material.

The invention provides a four-wheel type indoor mobile robot, and relates to a robot. The four-wheel type indoor mobile robot comprises a chassis, two driving wheels, two universal wheels, a controller and a lithium battery. The two driving wheels are two independent driving wheels adopting a wheel hub type DC brushless motor with a Hall effect sensor to act as a driving motor. The driving wheels and the driving motors are integrated. The controller adopts a full-bridge PWMDC/DC converter working in a bipolar mode to drive the DC brushless motors so that disadvantages in the prior art that DC brush motors are slow in commutation speed and high in noise, and the motors are liable to be damaged when the motors are in a wear and tear state for a long time can be overcome.

The invention relates to a method for controlling electronic pole inversion of a multiphase induction motor on the basis of vector control. In the invention, the characteristic of multiple control freedom degrees of the multiphase motor is utilized and a current of each d-q plane is subjected to independent decoupling control by adopting rotor field-oriented vector control, so that the motor is controlled to operate in rotary magnetic fields with different pole pairs. Compared with the conventional pole inversion technology, the method has the advantages that the electronic pole inversion under a non-shutdown condition is realized; not only can the constant power operation range of the motor be enlarged, but also the large pole pair is adopted and the motor has good starting performance at low speed and the small pole pair is adopted at high speed; and the same speed has low current frequency relative to variable frequency speed regulation, so that the switching frequency and the ironconsumption are reduced. Moreover, in the electronic pole inversion process, the current and torque transition is smooth. The method has high reliability and is particularly suitable for high-power places.

A method and device for controlling starting of a gas engine is proposed which is superior in starting performance and improved in load responsivity while maintaining air fuel ratio control.

There are provided a starting operation mode in which fuel gas flow is controlled by the fuel gas flow control valve based on actual mixture flow rate and adequate excess air ratio prescribed for each of detected values of operating conditions of the engine and then mixture flow is controlled by the throttle valve so that engine rotation speed approaches a target rotation speed, and a normal operation mode in which fuel gas flow is controlled by the fuel gas flow control valve so that engine rotation speed approaches the target rotation speed and then mixture flow rate is controlled by the throttle valve so that air fuel ratio of the mixture coincides with an adequate value prescribed for each of detected values of operating conditions of the gas engine with the fuel gas flow flowing at the commanded fuel gas flow rate, and a switchover rotation speed is predetermined so that operation mode is switched from starting mode to normal mode when engine speed reaches the switchover rotation speed.

The invention belongs to a hydraulic element, and particularly relates to an electric hydraulic pump for automotive electronically-controlled hydraulic power-assisted steering. An oil tank assembly (1) is fixed to an oil pump front cover (2-9) of an oil pump assembly (2) through screws, an oil pump back cover (2-4) and an oil pump body (2-2) are fixed to the right end face of the oil pump front cover (2-9) through screws, the left end of the oil pump assembly (2) is connected with a motor assembly (5) through screws, a stator assembly (5-3) is pressed in a motor shell (5-2), the left end of the motor assembly (5) is connected with a controller assembly (6) and a controller shell (7) through screws, a control panel assembly (6-1) and a connector assembly (6-3) are fixed to a heat dissipation support (6-2), and the heat dissipation support (6-2) and a support (9) are fixed under the motor shell (5-2) through screws. The electric hydraulic pump for automotive electronically-controlled hydraulic power-assisted steering is compact in structure, convenient to manufacture and maintain, good in starting performance, high in efficiency and little in consumed energy.

A supercharged internal combustion engine having a plurality of exhaust-driven superchargers staggered as a function of output of the engine, each connected or disconnected with a common exhaust manifold via an exhaust-driven turbine and an exhaust gas valve. Valve mechanisms are provided for changeover of transition air of an auxiliary compressor, having an output side connected to a common combustion air manifold, and of compressor air of a respective supercharger compressor added in staggered operation. Changeover is effected as a function of supercharger speed and combustion air pressure. Each valve mechanism has an ambient air valve, disposed between supercharger compressor outlet and combustion air manifold, and a supply air valve disposed between the compressor outlet and ambient air valve and leading to auxiliary compressor air inlet. A processor having a stored requirements profile activates/deactivates the exhaust gas valves, valve mechanisms and an auxiliary compressor motor.

A transmission controller operates an electrical oil pump in a steady mode, in which an operating load of the electrical oil pump is set at a steady load, during an idle stop, but operates the electrical oil pump in a high-pressure mode, in which the operating load of the electrical oil pump is higher than the steady load, for a predetermined period when an engine stops rotating.

The invention discloses a bank type bulwark and bidirectional airflow wave energy power generating device assembly. The bank type bulwark and bidirectional airflow wave energy power generating device assembly is characterized by comprising a bulwark (1) and a wave energy power generating device (2), wherein the bulwark (1) is trapezoidal and hollow and comprises a dike (3) and a dike road surface (4), the connection portion between the lateral side, close to the coastline, of the bulwark (1) and the lower base is provided with a wave inlet (6), the connection portion between the lateral side, far away from the coastline, of the bulwark (1) and the dike road surface (4) is provided with an air conveying opening (7), an air conveying pipe (8) is arranged in the air conveying opening (7), a power generating device (9) is arranged in the air conveying pipe (8), and an air inlet of the air conveying pipe (8) is provided with a waterproof valve (10). According to the bank type bulwark and bidirectional airflow wave energy power generating device assembly, the environmental and economic benefits are remarkable, the structure is simple, the durability is good, the manufacturing cost is low, and large-scale batch production can be achieved.

The invention provides a lithium-ion automobile starting storage battery with super capacitor function. The storage battery comprises a power supply formed by serially connecting a plurality of lithium battery cells, a super capacitor connected in parallel with the power supply, an over charge and discharge protection circuit device, a double cycle charging protection system, a numerical control voltage feedback multilevel current device and a bidirectional current automatic converter. The storage battery can directly replace the conventional lead-acid automobile starting storage battery and an electronic system of an automobile is not required to be adjusted. The lithium-ion automobile starting storage battery has high starting performance due to a double insurance structure; when a lithium ion battery is charged, a constant-current charger realizes successive constant current and constant voltage function; in addition, the balance problem when high-capacity lithium ion batteries are connected in series is solved, and the standard two-wire system storage battery charge and discharge system of the automobile has the function of a three-wire system of the lithium ion battery.

The invention discloses a load control balance valve and a load control hydraulic system. The load control balance valve (13) comprises a hydraulic control cavity (Pil) and a control port (Px). A pilot control oil circuit (X1) is connected between the control port and the hydraulic control cavity. A temperature compensation speed control valve (17) is arranged on the pilot control oil way so as to enable pilot control oil liquid flowing into the hydraulic control cavity to keep the flow stable in the working condition that the temperature of the oil liquid changes. The load control balance valve is good in process micro control performance, high in stability and capable of still keeping the flow stable under the working condition that the temperature of the oil liquid changes, and has the good self-adaptation adjusting performance of the temperature of the oil liquid. Due to the additional arrangement of the speed control valve, the balance valve can have better starting performance and be rapid in starting response and short in starting time. According to the load hydraulic control system with the load control balance valve, the load hydraulic control system is arranged on the working oil circuit of the load hydraulic control system, and the system is stable in operation, safe and reliable.

The invention discloses a hybrid magnetic bearing switched reluctance motor and a control method thereof, and belongs to the field of a magnetic suspension motor and control thereof. The motor is formed by connecting and integrating a 12-8-pole switched reluctance motor and a 4-pole magnetic bearing in series, wherein four suspension windings are wound around magnetic bearing stators and four reluctance motor stators which are aligned to the magnetic bearing stators, and are used for generating suspension forces, eight armature windings are wound around the other eight reluctance motor stators and are used for generating torques, during control, the suspension windings employ constant conduction excitation, suspension forces are simultaneously generated in the magnetic bearing and the reluctance motor, eight torque windings are connected to form two phases, excitation conduction is performed in turns, and torques are generated in the reluctance motor. According to the control method of the motor, the currents of the suspension windings are symmetric in each positive and negative half period, a positive torque and a negative torque which are generated are equal, the average torque is zero, and thus, the suspension forces and the average torque are decoupled; moreover, the starting performance of the motor is also improved by the positive torque, and the defect of difficulty in starting of a traditional two-phase motor can be overcome; and the hybrid magnetic bearing switched reluctance motor is simple in structure, and a power system is low in cost and is simple to control.

The invention relates to a reduction method and a reduction system for processing waste plastics. The method and the system take an IGBT heating module as the core, and can save over 40 percent of energy compared with the prior vacuum tube high-frequency equipment and the prior thyristor induction heating equipment. The method and the system adopt the novel catalytic pyrolysis method, namely the prior mode of directly placing catalyst zeolite into the waste plastics is changed and the waste plastics are gasified into oil gas and then degraded by Y-shaped molecular sieves. Therefore, the pyrolysis effect of the method and the system is more obvious; the quality of liquid fuel gasoline and diesel fuel produced is better; and the gasoline and the diesel fuel produced reach or exceed the national standards of No.70 gasoline SHO 42-92 and No. 0 diesel fuel GB 252-94. Moreover, No. 90 to No. 93 unleaded gasoline can be modulated by utilization of the gasoline.

The invention discloses a Manioca biological fuel mixture which is prepared by mixing Manioca oil with different types of diesel oil, wherein the fuel mixture is charged by alcohols and surface-active agents, each of the physical and chemical indexes of the mixture reaches or exceeds that of 0# diesel oil.