30results about How to "Reduce power shock" patented technology

The invention relates to an engine idle speed control-based AMT (Automated Mechanical Transmission) vehicle start control method, which comprises the following steps of: a, starting an engine, shifting to a start gear, controlling the engine to maintain an idle speed state by an electric control AMT, gently stamping a throttle to send out a starting signal; b, after receiving the starting signal, controlling a power source to drive a clutch to a semi-combined point; c, controlling an engine speed to be in a range of 650-1300 rpm by the electric control AMT, and detecting whether the ROTATING speed of an output shaft is more than 50 rpm or not; d, controlling the torque limit value of the engine to BE increaseD from 40% to 100% progressively by the electric control AMT and controlling the power source to drive the clutch to gradually combine, detecting whether the clutch sliding rate is less than 5% or not and whether the rotating speed of the output shaft is more than 120 rpm or not; and e, stopping controlling the engine by the electric control AMT, and ending a vehicle start process. The engine idle speed-control based AMT vehicle start control method has the beneficial effects of reducing abrasion of the clutch, increasing the comfort and economy as much as possible on the premise of maintaining dynamic property, and the like.

The invention relates to a motor torque zero-crossing anti-shake control method for new energy vehicles. The motor torque zero-crossing anti-shake control method comprises the steps that 1, judging whether motor torque is in a zero-crossing working condition; 2, limiting the torque output slope, and reducing torque zero-crossing impact; 3, judging whether the request torque generates the zero-crossing working condition again within the time of limiting the torque output slope; 4, judging whether the time for limiting the torque output slope is overtime or not; 5, judging whether a torque difference value between the request torque and the limited torque output slope is smaller than a first preset threshold value; 6, obtaining an output torque by adopting a following control algorithm; 7, judging whether the difference value between the current output torque and the request torque is smaller than a second preset threshold value; and step 8, completing torque zero-crossing control, returning to the step 1, and waiting for a next torque zero-crossing working condition. Compared with the prior art, the method has the advantages that the torque zero-crossing working condition can be predicted, the torque response speed is high, and the driving experience and the automobile dynamic property are improved.

The invention discloses a decentralized control method for heterogeneous air conditioning clusters based on frequency response. Firstly, a dynamic model of a single device is given according to the physical characteristics of the air conditioning load involved in the demand response, and based on the dynamic model, the steady polymerization power estimation changed along with the external temperature of the heterogeneous air conditioning clusters is given; then, according to the emergency fault response level of the power grid, the frequency threshold of the air conditioning participating in demand response is divided, and the polymerization power adjustment of the air conditioning clusters under different frequency deviation values is given; and finally, a frequency-based decentralized stochastic control method of the single air conditioner based on the parameters of the known system model is given. By means of the decentralized control method, the heterogeneous air conditioning clusters can quickly and accurately compensate the power mismatch of the power grid under the emergency fault, the communication cost is saved, and the frequency recovery of the power grid and the safe andstable operation of the system are facilitated.

The invention relates to road surface cutting equipment and method for road construction, and belongs to the technical field of road surface construction equipment. The road surface cutting equipmentcomprises a frame body; a driving machine and a cutting blade driven by the driving machine are mounted on the frame body; a guide wheel is arranged at the front part of the frame body, the guide wheel and the cutting blade are coplanar, the guide wheel and the cutting blade are respectively and correspondingly supported by a guide shaft and a saw blade shaft which are movably arranged on the frame body; a transmission shaft for connecting the cutting blade and the guide wheel is arranged on the frame body, and two ends of the transmission shaft are respectively and correspondingly connected with the guide shaft and the saw blade shaft through a bevel gear transmission set; a supporting rod is arranged on the frame body, a strip-shaped hole is formed in the supporting rod, and the transmission shaft penetrates through the strip-shaped hole; a push rod is arranged in the supporting rod. A motor is adopted to drive the push rod to rotate, and the push rod is in threaded connection with asliding sleeve, so that the rotating push rod can push the sliding sleeve and the transmission shaft penetrating through the sliding sleeve to one side close to the cutting blade, the bevel gear transmission sets at two ends of the transmission shaft are correspondingly connected with the cutting blade and the guide wheel respectively, and power transmission is achieved.

The invention relates to a driving system of an electric vehicle, in particular to an electromagnetic variable-torque driving system of an electric vehicle. The electromagnetic variable-torque driving system comprises an electromagnetic variable-torque driving device, a power cell, an electronic controller, a three-phase bridge type full control inverter circuit and a three-phase rectification circuit, wherein the electromagnetic variable-torque driving device comprises a three-phase separate excitation type synchronous motor and an electromagnetic variable-torque motor, and a rotor of the three-phase separate excitation type synchronous motor is connected with an inner rotor of the electromagnetic variable-torque motor; the power cell is connected with an input end of the three-phase bridge type full control inverter circuit, and an output end of the three-phase bridge type full control inverter circuit is connected with an armature winding of the three-phase separate excitation type synchronous motor; a magnetic pole winding of the inner rotor of the electromagnetic variable-torque motor is connected with an excitation winding of the three-phase separate excitation type synchronous motor through the three-phase rectification circuit, and an outer rotor of the electromagnetic variable-torque motor is connected with a hub. According to the electromagnetic variable-torque driving system disclosed by the invention, a completely new concept of electromagnetic variable-torque drive is provided, the electromagnetic variable-torque drive is realized through a specific structure, and an electric wheel of the electromagnetic variable-toque drive can have a great market application prospect.

The invention discloses a distributed cooperative absorption method for urban rail transit braking energy. Braking energy utilization devices of adjacent stations are triggered to be put into operation by controlling the absorption voltage of a traction substation braking energy utilization device, so that the regenerative braking peak power of a train which enters a station can be jointly absorbed by the energy utilization devices of the multiple adjacent stations, the power impact on a single station is reduced, better utilization of the regenerative braking energy in a subway system is facilitated, and the probability of transmitting electric energy back to an urban power grid is reduced.

The invention provides a torque control method and device for a mechanical throttle body, a medium and a vehicle. When torque response is achieved, when the vehicle runs in a periodic fuel cut-off and fuel supply control mode, in each ignition cycle of each fuel cut-off and fuel supply control period, the ignition advance angle is delayed according to the first fuel cut-off frequency, the first fuel supply recovery frequency and the preset ignition advance angle control rule. When the vehicle runs in each ignition cycle of quitting the periodic fuel cut-off and fuel supply control mode and quitting the periodic fuel cut-off and fuel supply control mode, the second fuel supply recovery times are increased according to the second fuel cut-off times, the second fuel supply recovery times and the preset fuel supply recovery target times, and the ignition advance angle of the vehicle is controlled according to the preset ignition advance angle control rule. And the ignition advance angle is delayed. When the torque reduction requirement is responded, power impact of a transmission system can be reduced, smooth transition of torque is achieved in the process of quitting the torque response mode, and therefore the driving comfort is improved.

The invention relates to a doubly-fed wind power hybrid direct current sending-out system alternating current fault control method and control system, an active power outer ring is transformed and optimized, when an alternating current fault occurs, an actual power instruction value of a wind generating set can quickly follow the grid-connected point output power of the wind generating set, and when the alternating current fault is cleared, the actual power instruction value of the wind generating set can quickly follow the grid-connected point output power of the wind generating set. The actual power instruction value of the wind generating set is gradually recovered to the power instruction value before the fault at a certain slope, and smooth processing is carried out on switching between a low-voltage fault ride-through link and a conventional active power control link, so that the wind generating set can stably and gradually recover output after the fault is cleared, and the power utilization rate of the wind generating set is improved. The power impact on the MMC is reduced, sufficient adjustment time is reserved for the MMC, and the phenomena that the voltage of the sub-module rises and serious overvoltage occurs on the direct current side and the alternating current side due to the fact that serious power surplus occurs in the MMC in the alternating current fault recovery period are avoided.

The present invention discloses a method for eliminating power shock waves generated by switching of a single transformer and double transformers. The method allows a period value T and an open valueTon of a transformer to be consistent so as to eliminate power shock waves, reduce the power shock to the most extent and improve the product life. The method provided by the invention allows the system power to suddenly maximally reduce 1%, allows the maximum power to suddenly reduce 37.5% and allows the maximum power to maximally increase 100% compared to a current market, and has a substantialprogress, namely eliminates the power shock waves generated by switching of the single transformer and the double transformers.

The invention relates to the technical field of graphite product processing, in particular to a large-scale graphite product and a graphitizing method thereof. The large-scale graphite product has thevolume density being 1.82 to 1.87g/cm<3>, the electrical resistivity being 5 to 6 mu omega. m, and the porosity being 9 to 12 percent; according to the graphitizing method, during power transmissioninitial power, the electrical resistivity of a furnace core is 21 to 27m omega. m, preferably 25m omega. m, and a fluctuation range of the electrical resistivity of the furnace core is 5 to 10 percentduring a graphitizing process. According to the large-scale graphite product and the graphitizing method thereof provided by the invention, through adjusting the initial furnace core electrical resistivity, changing a charging way of the large-scale graphite product, and adjusting a power increasing speed of a power transmission curve, the graphitized product has a favorable compact performance,and the yield is improved.

The invention discloses an outlet buffer tank of a fused salt heat absorber, which is connected with a heat absorber tube panel outlet pipeline through a tube panel outlet pipeline inlet pipe interface. The end portion, arranged in the outlet buffer tank, of the inlet pipe connector of the pipe panel outlet pipeline is connected with a distribution header which is arranged at the bottom in the outlet buffer tank and arranged in the axial direction of a tank body of the outlet buffer tank, and a plurality of nozzles are formed in the distribution header in the axial direction of the distribution header. Molten salt heated by the heat absorber enters the distribution header through a tube panel outlet pipeline introduction pipe connector and enters the outlet buffer tank through a plurality of nozzles in the distribution header. The outlet connecting pipe of the heat absorber is introduced into the tank body and connected with the distribution header, so that power impact of jet flow on the tank body can be reduced, sufficient disturbance and mixing of fluid of different loops of the heat absorber can be guaranteed, mixing of fused salt is enhanced, and on the premise that the operation requirement of a heat absorber system is met, the energy consumption is reduced. And the reliability and the safety of equipment operation are improved.

The application provides a maximum power tracing method and a maximum power tracing device. The method includes steps of monitoring output power and PV voltage of a solar panel according to the setting frequency; calculating to obtain adjusting step base of the PV voltage according to the monitored output power and the PV voltage of the solar panel; adjusting the counting value of MPPT according to the output power of the solar battery this time, the output power detected last time and preset minimum power adjusting value; adjusting the PV reference voltage on the basis of the adjusting step base according to the comparison result of the adjusted counting value of MPPT and the set MPPT reference value; using the PV reference voltage as the control target of a past-grade power circuit. Themaximum power tracing method and device have the advantages of realizing the purpose of reducing the power oscillation of the MPPT maximum power tracing.