382results about How to "Shock suppression" patented technology

The invention relates to the technical field of operation and control of an electric power system and discloses a method for detecting and identifying dynamic bad data of the electric power system. The method comprises the steps of A, reading a current network parameter and a network topology of the electric power system and forming a node admittance matrix and a branch circuit-node incidence matrix; B, establishing an equivalent circuit according to the network topology of the electric power system and configuring measurement functions and a power management unit (PMU) of the electric power system, wherein system measurement includes node voltage amplitude measurement, node current amplitude measurement, node power injection measurement and node trend measurement; C, detecting and identifying the dynamic bad data of the electric power system; D, judging the convergence condition. By means of the method, accidentally arisen bad data from a supervisory control and data acquisition (SCADA) system and in the PMU measurement can be found and eliminated, and accordingly an accurate operation state, voltage amplitude and phase angles of nodes of a power grid are obtained.

A protective case for a mobile device having a multi-layered construction is disclosed. The multi-layered construction includes three layers that are co-molded to one another and is capable of being lightweight and low-profile, yet provide a high level of impact protection. The first layer generally forms the external back face surface of the case, the third layer generally forms the perimeter bumper of the case and the second layer forms the internal liner of the case and includes an elevated pattern of walls upon which the back face of the mobile device rest upon. The first layer is comprised of material that has a hardness greater than the other two layers. The third layer is comprised of a material that has a hardness that is greater than the second layer. The layers are configured to interact with one another so that they are capable of distributing and absorbing impact forces to mitigate damage to the mobile device.

A modular marine vessel has a variable hull and a plurality of boat forming modules including a bow section module, a load section module having a bow end and an aft end, and a bulkhead forming module is detachably connected to each bow and aft end of the load section module. The bulkhead forming module that is connected at the bow end of the load section module is detachably connected to the bow section module. Each boat forming and bulkhead forming module includes a topside section and a hull bottom side section. The topside section of each boat forming module has a shell gunnel portion, and the hull bottom side section of each boat forming module has a pivotally mounted bottom shell hull portion. The gunnel and hull portions of the load and bow section modules are detachably connected end-to-end, and sealingly juxtaposed the detachably connected bulkhead forming module to prevent water from entering the boat when the boat engages water. The bottom shell hull portion is pivotally mounted across a keel tunnel using a pneumatic, hydraulic, mechanical, or electro-mechanical actuator to form a preselected hull shape as desired. Novel mechanisms for sealing module connections, for module attachment, for pivoting hull panels, for hull pivot drives, and energy conversion systems for the marine vessel of the invention are disclosed.

A rolling soft sided luggage case enclosing a volume and having opposing sidewalls, the sidewalls being supported by a tubular strut frame structure independent of the wheel housings mounted at the rear corners of the case. A straddle bracket affixed to a middle region of a side edge of the structural base joins the rear sidewall strut to the rigid base without engaging the wheel housing in order to facilitate ease of construction and repair of the wheel bracket. The levered portion of the base to which the wheel housing is affixed serves as a dampened swing arm on which the luggage case is sprung in order to isolate the structural frame of the case from bumps while being rolled and to and dampen shocks to the structure.

A vehicle drive control device comprising an engine 12 that generates power by combustion of fuel; an automatic transmission 10 that transmits a reverse input from a drive wheel to the engine and operates between multiple forward gears each having a different gear ratio. A fluid power transmission device 14 provided between the automatic transmission and the engine for transmitting power by fluid, the power transmission device having a lock-up clutch; and a controller 90 . The controller executes the fuel cut control 104 for stopping fuel supply to the engine when the fuel cut condition including when the vehicle is in a coasting state when the throttle valve of the engine is fully closed and the engine speed is equal to or greater than a predetermined value is established; Control 120 for engaging the lock-up clutch is performed when a lock-up clutch engagement condition including the vehicle is in a coasting state is established; at a coasting vehicle speed that varies according to the state of the lock-up clutch under the control for engaging the lock-up clutch Next, the downshift control 114 of the automatic transmission is executed.

The invention belongs to the technical field of electric system operation and control, and particularly relates to an electric system state estimation method of a Phasor Measurement Unit-PMU based on an interpolation matrix. According to the method, during the updating interval period of SCADA measurement, a state, obtained through a PMU interpolation, of an area U is equivalent to prior state information of the area U, the prior state information is continuously updated at each sampling instant of the PMU, the interpolation matrix is updated when SCADA measurement and PMU measurement reach simultaneously at the next moment, and therefore the real-time running state of each node of the area U is worked out. The method has the advantages of being high in accuracy and sampling speed of PMU measurement, and can track the running state of the system accurately in real time.

The invention relates to a robust autonomous control method for the bus voltage of the DC micro grid. A nonlinear interference observer, DC bus voltage sagging control and voltage / current double-loop control are combined in the method. The method comprises that a DC-DC current transformer model is established; the nonlinear interference observer is used to track output current of the DC-DC current transformer model, and a band pass filtering link based on a second-order general integration link is used to filter output results of the observer; in DC bus voltage sagging control, the output results of the nonlinear interference observer serve as the output current; and in voltage / current double-loop control, perturbation current of the output results of the nonlinear interference observer is used for feedforward control. The method can be used to realize peer-to-peer control and autonomous operation of the DC micro grid, effectively improves dynamic response of the control system, inhibits fluctuation and impact of transient DC bus voltage, and is conducive to expansion and plug-and-play of distributed power supplies and loads in the DC micro grid.

The invention discloses a high-frequency transformer. The high-frequency transformer comprises a magnetic core and windings, wherein the magnetic core and the windings are arranged on a skeleton; and two shielding layers are arranged on the windings. The invention further discloses an electronic magnetic interference (EMI) suppression circuit including the high-frequency transformer. The EMI suppression circuit comprises a common-mode capacitor, an alternating current (AC) input, a common-mode inductor, a rectifier filter, an LLC converter, a high-frequency transformer and a rectified output, wherein one end of the common-mode capacitor is connected to a zero end of the common-mode inductor; and the other end of the common-mode capacitor is connected to a negative port of the rectified output. The two shielding layers are arranged on the high-frequency transformer, so that the electronic magnetic interference of the high-frequency transformer is suppressed to the minimum. According to the EMI suppression circuit including the high-frequency transformer, the problem of electronic magnetic interference is efficiently solved; the high-frequency common-mode interference current shock is relatively well suppressed; the size and the weight are reduced; and the cost is reduced.

A totally enclosed flexible deep water enclosure can effectively separate open water body. The main body comprises a flexible bar shape floating body, a cork rope, a wall cloth, a ground rope, and a stone dragon. The stone dragon is buried in a sealed close bottom end of a silt layer, and the flexible bar shape floating body floats on the water to form separation. A mooring cable is used for fixing the ground rope on two under water wood piles at two sides, preserving degree relaxation in the vertical and horizontal directions. An under water anchoring mooring cable, the ground rope, a wall cloth longitudinal stiffening rib, and the cork rope constitutes the network-shape mechanics structure of the enclosure. The flexible bar shape floating body uses a flue to wrap a flexible closed-hole foam plastic strip, and the outside is protected by a changeable coating for structural durability. The enclosure subsections are connected by zipper fashion blanket stitches, convenient for processing, transportation, installation, dissembling, maintenance, and reuse, and can be used for contemporary separation of part water areas of the open water body, such as the boundary control of water surface project area, the separation and diversion of polluted water mass. The invention is suitable for natural conditions such as deep water (10m above), storm, water current, water level fluctuating, with the service life of 5-10 years.

The invention discloses a device and method for low voltage ride through of a double-fed inductive wind power generator system. In the invention, the advantages of using a high-resistance resistor and a low-resistance resistor are effectively combined through the real-time regulation of the equivalent resistance of a crowbar resistor; under the condition of small voltage fluctuation of a direct-current bus, the shock of rotor current is better inhibited, and the rotor current is quickly attenuated to a safe range, so that a rotor excitation converter is effectively protected and the transient-state shock to an electrical network and a mechanical system is reduced; meanwhile, security, stability and recovery of the voltage of the electrical network are effectively aided through the cooperative reactive power compensation of a rotor side converter and a network side converter during the voltage dip of the electrical network.

The invention relates to a virtual synchronous generator fault current suppression method based on adaptive virtual impedance. When a power grid fails, the voltage of a power grid drops, a VSG can generate large fault current, particularly at the moment when a fault occurs and is removed, the VSG can generate large impact current; when the output current of the VSG exceeds the maximum value of thecurrent capable of being borne by an inverter, irreversible damage to the VSG system can be caused, and meanwhile, the stability of the power grid is further reduced. The VSG does not have a fault ride-through capability, so that the VSG can only have the fault ride-through capability through a reasonable control scheme. According to the method of the invention, VSG fault current is suppressed bythe self-adapting of virtual impedance and the modification of a VSG reference voltage during the fault, so that the VSG has the fault ride-through capability on the premise of not changing a controlstructure. The method has high control precision. With the method adopted, fault current and impact current can be effectively suppressed; and the control structure is not changed.

The invention relates to a remote meter reading system, which adopts meter reading modules provided with electric energy metering chips; the voltage, the frequency, the active power, the power and the like can be measured, calculated and stored on the premise of inhibiting the harmonic waves and preventing the impact of overcurrent on the system; the data is processed under the control of a microprocessor and is then sent to a superior system. Meanwhile, respective meter reading modules form a sensor node for wireless networking, so that the integrated uploading of the data can be realized; the system maintenance, the fault overhaul and the expansion are easier. Finally, terminal electricity meter data is stored into a main database server; special system software is matched; the functions of automatic meter reading, data processing, information analysis statistics and the like are realized.

The invention relates to a test method for starting of a modular multi-level multi-terminal flexible direct-current transmission system. The system comprises a plurality of modular multi-level converters connected in parallel. Each of the converters is corresponding to a convertor station and comprises a plurality of sub-modules. The method is characterized in that when any far-end convertor station is unlocked, the input number of the sub-modules is reduced gradually till the normal operation number is reached after double of the number of normal operation sub-modules is input, so that a charging equivalent circuit is free of jumping during unlocking of the station.

A piezooscillator having a piezoelectric resonator, composed of: a case surrounding a space where the piezoelectric resonator is provided and including a substrate and a cover; a buffer material supporting the piezoelectric resonator and suppressing a shock conveyed from the case to the piezoelectric resonator; and a wiring member electrically connecting the piezoelectric resonator and the substrate and having flexibility, or composed of: a case surrounding a space where the piezoelectric resonator is provided and including a first substrate and a cover; a second substrate mounting the piezoelectric resonator thereon; a buffer material supporting the second substrate and suppressing a shock conveyed from the case to the piezoelectric resonator; and a wiring member electrically connecting the first and second substrates and having flexibility, in which, when the case suffers the shock from outside, the buffer material absorbs the shock to prevent the shock conveyance to the piezoelectric resonator and frequency variation arising in the piezooscillator, realizing shock-resistance improvement, is provided.

The invention belongs to the technical field of power electronic application, and especially relates to a wide-input direct current inverter topology and a feedforward average current control method thereof. The wide-input direct current inverter topology comprises a two-transistor Buck-Boost inverter and an interleaved two-transistor Buck-Boost inverter. The feedforward average current control method applicable to the wide-input direct current inverter topology is composed of an input voltage feedforward module, a mode switching module, a voltage outer ring and a current inner ring. According to the method, input voltage feedforward is introduced into the current inner ring in average current control, a feedforward function from the input voltage feedforward to the current inner ring is computed, simplification is carried out, thereby obtaining feedforward average current control applicable to practical application, and the input dynamic response performance of the inverters in a whole input voltage range is greatly improved; and moreover, by adoption of an interleaving technology, the conversion capacity is increased, the output current ripple is effectively reduced, and the support is provided for the field with wide range input and high power conversion.

The invention provides a heat exchanger and an air conditioner. The heat exchanger can be used as a condenser or an evaporator. Partition boards are disposed in the collector tubes so that a plurality of distribution chambers are formed in the collector tubes; a plurality of inlet tubes and outlet tubes are provided; and accordingly coolant can be distributed. When a warm room operates, vortexes formed by the coolant in the distribution chambers are sprayed up from spray holes on the distribution chambers to form jet flows, the coolant is pelletized and equally enters flat tubes, and accordingly annular flows with good heat transfer effect are formed, the parts are subjected to even heat exchange and the performance of the heat exchanger is improved. When a cold room operates, gas coolant continuously radiates heat outside through pipelines to form liquid condensate or gas-liquid flows, and the liquid condensate or gas-liquid flows enter the distribution chambers from the lower spray holes of the spray chambers in the first collector tubes and are discharged from the inlet tubes. In addition, the size of coolant pellets is reduced, impact of the coolant pellets upon the inner walls of the tubes and pellet collision are inhibited, and accordingly flowing noise of the coolant can be reduced.

A sulky that includes a platform having a top and a bottom, a connector disposed upon a front of the platform, at least three wheels disposed upon the bottom of the platform in a wheel arrangement such that the connector is zero-weight bearing, and a seat disposed upon the top of the platform. A hinged platform extension provides added stability.

A large gearshift shock that occurs if a renewed gearshift operation is forcibly carried out in order to meet a new gearshift request made through a driver's operating an accelerator pedal or a signal from an operation lever during a current gearshift operation. Gearshift response lag occurs due to an attempt to avoid the large gearshift shock. To solve these problems, a control system for a gear type transmission is mounted. The control system is provided with a renewed gearshift disabling period, during which any renewed gearshift request to a third predetermined gearshift position made during a gearshift operation from a first predetermined gearshift position to a second predetermined gearshift position is disabled.

The invention discloses a thick-film magnetic isolation direct current solid-state power controller which comprises a power MOSFET (metal oxide semiconductor field effect transistor), a detection resistor, a power diode, a TVS (transient voltage suppressor) diode, a current conditioning circuit, a voltage detection circuit, a voltage state judgment circuit, a current state judgment circuit, an immediate trip circuit, an inverse time circuit, a short-circuit detection circuit, a driving circuit, a state synthetic circuit, a trip state latch circuit, a time delay reset circuit, a time sequence matching circuit, a DC / DC (direct current / direct current) isolated power supply, a first isolation circuit, a second isolation circuit, a third isolation circuit, a state feedback interface circuit, a control signal interface circuit and a power-on reset circuit. The circuit structure can optimize the electrical properties of the controller, reduce the volume and the weight, improve the reliability and is widely applied to civil low-voltage direct current power distribution systems, aviation, aerospace, tanks, automobiles, ships and other fields.

The invention discloses an automatic gear shift control system and method of a motor-transmission integrated drive system for an electrical vehicle. The motor-transmission integrated drive system comprises a drive motor, a transmission, a motor controller and a gear shift execution mechanism, wherein the drive motor is directly connected with the transmission through a spline and controlled by the motor controller to output a torque to the transmission; the gear shift execution mechanism is used for finishing the gear shift operation of the transmission; the motor-transmission integrated drive system is characterized in that a vehicle controller is arranged for coordination control on the motor controller and the gear shift execution mechanism to realize automatic gear shift function of the motor-transmission integrated drive system; the vehicle controller and the motor-transmission integrated drive system form the automatic gear shift control system. According to the automatic gear shift control system, the automatic gear shift function of the motor-transmission integrated drive system can be realized and the gear shift quality of the motor-transmission integrated drive system can be improved.

The invention relates to a control equipment for a vehicle. In an embodiment method of the invention, when returning from the neutral control, an air damper is slowly opened unrelated to the rolling reduction of the accelerator pedal by drivers from the return of the neutral control after the delayed time, thereby restraining the early increase of the motor torque. Besides, the braking pressure is smoothly released from the neutral control return after the delayed time. By the method, the environment (opening of the air damper, braking pressure) returning from the neutral control is suitably set considering the joint of the forward clutch, thereby restraining the impact when returning from the neutral control.

When the driver makes a request for switching the shift range to the P range despite that the vehicle has not yet stopped completely, the wheel cylinder pressure is maintained at a brake hold pressure Ph for a while, rather than switching the shift range to the P range immediately. At this time, more specifically, the wheel cylinder pressure is maintained at the brake hold pressure Ph for a brake hold duration Δt within which the vehicle is estimated to stop, and when the brake hold duration Δt has passed, the shift range is switched to the P range. After the lock mechanism is actuated to establish the P range, the wheel cylinder pressure is gradually reduced from the brake hold pressure Ph at a given pressure reducing gradient.

A shutter for digital cameras includes a first driving member for a front blade and a second driving member for the front blade, mounted to the same shank; arms for the front blade on which a set spring is hooked; and a set member for restraining the first driving member for the front blade in the proximity of the position where the exposure operation is completed, at a set position by rotating a restraining member, and actuating the first driving member for the first blade to the starting position of the exposure operation in the restoration to the initial position immediately after the release. When the second driving member for the front blade is failure to actuate because of the failure on the circuit, the said set member wound not carried out the next setting operation.

The invention provides a surface texture measuring instrument. In the surface texture measuring instrument, a measurement arm (24) includes: a first measurement arm (24A) that is supported by a bracket (22) around a support shaft (23) movably in a circular movement in a casing (28); and a second measurement arm (24B) having styluses (26A, 26B) that are attachably and detachably provided to an end of the first measurement arm (24A) via an attachment-detachment mechanism (25), the attachment-detachment mechanism (25) being arranged in the casing. A displacement detector (27) includes: a scale (27A) provided to the measurement arm; and a detection head provided to the bracket (22) to face the scale. A detecting surface of the scale is on an axis of the measurement arm and on a plane of the circular movement of the measurement arm.

Whether the master cylinder pressure Pm of the brake master cylinder is higher than the reference pressure Pmref is determined (step S 120). Based on the determination, the lock-up clutch of the torque converter is promptly released (step S130) or gradually released (step S140). Whether the master cylinder pressure Pm is higher than the reference pressure Pmref is determined (step S160). Based on the determination, the connection provided by the clutch is promptly terminated (step S170), or gradually terminated (step S180). Because the lock-up clutch is released and the connection provided by the clutch is terminated based on the operation of the brake pedal performed by the driver, a sense of discomfort felt by the driver can be suppressed.

The invention discloses a braking system with combined function of drive-by-wire and power-assisted and with a manpower-magnification action. Functions such as electric braking power-assisting, active braking and regenerative braking can be achieved, control can be conducted on a motor, a hydraulic control unit and several magnetic valves according to the collected signal of a brake pedal displacement sensor and a master cylinder pressure sensor through an electronic control unit, and choice on each braking mode is realized. When the system works under the drive-by-wire mode, the motor is controlled by the brake pedal displacement sensor to push the master cylinder piston to output the brake pressure to a wheel cylinder, and a brake pedal and a friction brake are coupled completely at the moment; when the system works under the electric power-assisting mode, the pedal effort is input into a master cylinder back cavity after being amplified through a human-powered cylinder, a first piston of the master cylinder is pushed, at the same time, the motor output torque is controlled by the electronic control unit, the electronic control unit exerts assisting power on the first piston of the master cylinder, and the brake pressure is output to the wheel cylinder; when the system works under the active braking mode, the electronic control unit controls the motor output torque to make the main cylinder to output the brake pressure to the wheel cylinder.

The invention discloses a method truly realizing smooth, stable, uninterrupted and synchronization switching function between power frequency operation and variable frequency operation, and the method is based on a high voltage frequency converter motor control system; the variable-to-power frequency operation switching method comprises the following steps: allowing a main controller to use a non-code disc vector control algorithm to control a high voltage motor until the high voltage motor frequency rises to the set frequency; switching the non-code disc vector control algorithm to a constant voltage frequency ratio control algorithm, and allowing the high voltage motor frequency to continuously rise to the high voltage network voltage power frequency; sampling high voltage motor stator current and voltage so as to calculate a power factor when a high voltage frequency converter stably works, thus determining amplitude and phase object values of the high voltage frequency converter output voltage when variable frequency operation is switched to the power frequency operation; allowing the high voltage frequency converter output voltage amplitude and phase to reach object values, then gradually changing until the high voltage frequency converter output voltage amplitude and phase are consistent with the high voltage network voltage amplitude and phase, so the high voltage frequency converter output current can be gradually transferred to a power grid access contactor line, thus finishing the switching process.

The present invention relates to a door latch assembly with single complex type damper which is provided to a base plate of a door latch of an automobile door to perform damping function to dampen shocks of both a striker and a pawl lever, comprising: a striker damping part which provides damping force in response to the striker at the moment of surface-contacting the striker which is locked to the claw; and a pawl lever damping part which is formed to face downward at a lower end which is integrally formed by being extended from the striker damping part so as to give damping force to the pawl lever which rotates together with the pawl.