50results about How to "Meet the dynamic requirements" patented technology

Disclosed is a structural dynamics design method of the rotor of an aerial engine. Based on the characteristics of the working status of a high propulsion ratio aerial engine, the structural dynamics design method of the rotor of the aerial engine presents the concept of thermal modal to adapt to structural dynamics design of the rotor of the aerial engine under variable working conditions. The structural dynamics design method of the rotor of the aerial engine is characterized by optimizing the parameters of the rotor and bearings, enabling the thermal modal of a rotor system to avoid the modal of the rotor under the absolute rigidity of the bearings, meanwhile, giving play to the effects of a damper and enabling the rotor system to meet the requirements of vibration standards in the thermal modal. The structural dynamics design method of the rotor of the aerial engine comprises taking the margin between the modal of the rotor with elastic bearings and the modal of the rotor under the absolute rigidity of the bearings as optimized parameters, meanwhile giving play to the damping effects of the damper to meet the dynamics requirements of the rotor system. The structural dynamics design method of the rotor of the aerial engine changes the traditional design concept of design first and checking calculation later and performs active design of the dynamics characteristics of the rotor to achieve circulating design, thereby improving the working efficiency and having significant engineering practical value.

The invention provides a power dividing method of a compound power source fuel cell hybrid energy system of an electric automobile. The method includes the steps that firstly, when a fuel cell is started, a fuel cell controller acquires the fuel cell voltage at the initial moment and the fuel cell current at the initial moment and acquires the fuel cell voltage and the compound power source voltage at every next moment; secondly, a discrete prediction model of the compound power source fuel cell hybrid energy system is established, and the power of the fuel cell at the next moment is determined; and thirdly, the reference output power of a storage battery at the next moment and the reference output power of a super capacitor at the next moment are further determined, and power division isachieved. By the adoption of the method, the demanded power of the whole automobile is optimized and divided, the defect that the fuel cell is slow in dynamic response is overcome, meanwhile power losses of a compound power source are reduced, the work efficiency of the compound power source is improved, the dynamic property requirement of the automobile is met, and the driving mileage of the automobile is increased.

The inventin discloses a protecting method in a projecting system comprising projection information transmitting end and projecting end, able to achieve static image and dynamic video display effect on the condition of limited transmission bandwidth. And it comprises the steps of: at the projection information transmitting end, analyzing the projection information to generate static picture information and dynamic picture information; transmitting them as data to the projecting end; at the projecting end, extracting them from the received data; and displaying them in the respective windows. And the invention can assure projected picture performance and effectively reduce CPU processing ability requirements.

The invention discloses a motor torque control method aiming at different driving modes. The motor torque control method aiming at the different driving modes comprises the following steps that (1) anaccelerator pedal position signal, an accelerator pedal change rate signal, a gear signal, a motor voltage signal and a battery SOC signal are acquired through a high-speed CAN bus to judge an immediate driving mode of a driver; the driving mode comprises an economic mode and a power mode; (2) the motor voltage signal is acquired, and initial motor target torque is determined according to the current voltage of a motor; and (3) the initial motor target torque is adjusted to final motor target torque according to the driving mode result judged in the step (1);and the final motor target torqueis the motor torque corresponding to a pedal working mode under the corresponding pedal opening under the specific working condition. According to the motor torque control method aiming at the different driving modes, the motor torque is rapidly adjusted according to the driving modes of a driver, the economical and dynamic requirements of the whole electric vehicle are met, and the endurance mileage of the whole vehicle and the output accuracy of the motor target torque are improved.

The invention relates to a continuously adjustable mechanical hydraulic valve lift device which belongs to the technical field of internal combustion engine. The continuously adjustable mechanical hydraulic valve lift device comprises a valve cam, a valve, a valve spring, a plunger piston adjusting arm, a plunger piston spring base, a tappet plunger piston, a plunger piston spring, a tappet plunger barrel, a retaining nut, a low pressure oil cylinder, a first gasket, a second gasket, an executing plunger piston and an executing plunger barrel. The lift range is decided by the relative position of the tappet plunger piston and a first oil hole at the tappet plunger barrel. The symmetrical plane of the plunger piston adjusting arm is coincident with the symmetrical plane of a diclinic section at the head of the tappet plunger piston, and the symmetrical plane of the plunger piston adjusting arm along the axial line is considered as a reference plane. When maximum lift is required, the plunger piston adjusting arm is rotated to ensure that the reference plane is parallel with the axial line of the first oil hole. When minimum lift is required, the plunger piston adjusting arm is rotated to ensure that the reference plane is vertical to the axial line of the first oil hole. When medium lift is required, the plunger piston adjusting arm is rotated to ensure that the reference plane and the axial line of the first oil hole form any angle between 0 to 90 degrees. The device has simple structure and can adjust valve lift, valve right timing and duration continuously.

The invention discloses an electric vehicle power system with a hollow rotor motor and double-gear speed reduction with differential speed. The electric vehicle power system comprises a hollow rotor brushless direct current motor; a sun wheel hollow rotor of the hollow rotor brushless direct current motor is used as a sun wheel of a first-grade planetary speed reduction gear train and is used for carrying out power input; double-gear speed change is realized through a second-grade planetary speed reduction gear train; the sun wheel hollow rotor is provided with a through central hole, so that an axle shaft conveniently penetrates through the through central hole to carry out power transmission; the combination and separation of two groups of the planetary speed reduction gear trains are realized through driving a gear-shifting shift fork by a gear-shifting motor, so that the conversion of high and low speed ratios is realized; a differential speed function of output is realized through a bevel gear differential mechanism. According to the electric vehicle power system with a hollow rotor motor and double-gear speed reduction with differential speed, disclosed by the invention, high-frequency output of the motor is realized through double-gear speed reduction under different working conditions of the motor; meanwhile, the structure of the motor is optimized, the transmission efficiency is high, the structure is compact, the weight is light and the power system is convenient to mount and arrange.

The symmetrical admission and exhaust cam for three cylinder gasoline engine has profile line with the work section equation of h=(hmax-hr)(1+c2A2+c4A4+cpAp+cqAq+crAr+csAs), where, h is the lift of the cam work section, hmax is the maximum lift and equals to 7.3-7.5 mm, hr is the lift of cam buffer section and equals to 0.3-0.35 mm, A is cam angle, p, q, r and s are indexes, c4=0.1, p=14, q=28, r=42, and s=56. The cam has base circle diameter of 33 mm, contact width to the jib of 10 mm, total contact angle of 167-172 deg, work section angle of 121 deg, and buffer section angle of 46-52 deg. The symmetrical admission and exhaust cam has the advantages of capacity of reaching excellent dynamic characteristic of gasoline engine and smooth running of the valve mechanism, and small thickness.

The invention discloses a collaborative optimization energy management method of a parallel hybrid electric vehicle. The problem that the existing energy management control cannot meet the requirements of two aspects of real-time application and global optimization at the same time can be better solved; the advantages of dynamic planning and fuzzy control are combined; the invention further provides an off-line optimization decision support system, a globally optimal torque distribution strategy and a battery SOC trajectory are used as guidance, the optimal performance of a real-time controller is improved, a membership function and a fuzzy rule of a fuzzy controller are improved, and a high-performance real-time control strategy is obtained.

The invention discloses a current/frequency conversion circuit linearity and symmetry digital compensation method. The current/frequency conversion circuit linearity and symmetry digital compensation method comprises the steps of measuring and recording D trigger output pulse number and subdivided pulse number when different current values are input into a current/frequency conversion circuit; confirming conversion circuit linearity compensation factors and performing compensation to a conversion circuit output in digital mode; measuring and obtaining symmetrical coefficient and zero coefficient of the current/frequency conversion circuit; and confirming symmetrical compensation coefficient of the conversion circuit and performing real-time compensation to the conversion circuit output in digital mode. By means of the current/frequency conversion circuit linearity and symmetry digital compensation method, the problems including complicated operation, effective accuracy, high demands on debugging persons and unsatisfied batch production demand in the current production debugging process is effectively solved.

The invention provides a lithium iron phosphate battery state of charge (SOC) estimation method based on dynamic optimization forgetting factor recursive least square online identification. The method comprises the steps: carrying out segmented equal-interval discharge standing test on a lithium iron phosphate battery to obtain the curve relation between the open-circuit voltage and the state of charge of the lithium iron phosphate battery, carrying out particle swarm optimization on a forgetting factor, recurring a forgetting factor of a least square method, and estimating the SOC of the battery by combining optimized least square online identification and extended Kalman filtering. According to the method, the forgetting factor selected in real time can enable the terminal voltage following error to be extremely small so as to ensure the accuracy of parameter online identification, and the optimized forgetting factor recursive least square and extended Kalman filtering are combined to estimate the SOC of the lithium iron phosphate battery; and the combined estimation precision is high, and the dynamic requirements of combined estimation on forgetting factor values under different batteries and different battery use environments can be adapted.

The invention relates to an electric drive device with double motors and single planetary gear train, which comprises a first drive motor (16), a planetary gear train (100), a second drive motor (13), a wet clutch (104), and a planetary gear train (100 ) includes a sun gear (101), a ring gear (102), a planet carrier (103) and a planetary gear housing, the first drive motor (16) is connected to the sun gear (101), and the ring gear (102) is connected to the The housings of the planetary gear train are fixedly connected, the second drive motor (13) is connected to the planet carrier (103), one end of the wet clutch (104) is connected to the sun gear (101), and the other end is connected to the planet carrier (103) connected. Compared with the prior art, the present invention has the beneficial effect that it can realize two-speed gear shifting without power interruption, while achieving the purpose of decelerating and increasing the torque of the first drive motor and meeting the power requirements of the vehicle, through the wet clutch that is The shifting process can be completed, and the shifting process is stable, the shifting time is short, and the driving comfort is good.

The invention discloses a parallel type hybrid power monorail crane control method. A cab, a hoisting beam, a track, a first anti-explosion container, a second anti-explosion container and a hydraulic driving part are included. The required torque in the driving process is Tr, and the optimal working interval of the torque is Te_min-Te_max; when Tr is smaller than Te_min, a pure motor driving mode is adopted; when Tr is larger than Te_min and smaller than Te_max, a pure fuel oil driving mode is adopted; and when Tr is greater than Te_max, a hybrid power driving mode is adopted. The two power sources of the diesel engine and the motor are arranged by combining the structural characteristics of the monorail crane, the whole vehicle is compact in structure and better in high-speed economical efficiency due to the parallel hybrid power connection mode, different driving modes are adopted according to different power requirements, stronger and more stable power can be provided, and the problems of insufficient power and the like of the monorail crane during urgent acceleration, steep slope climbing and high-speed running can be solved.

The invention provides an NURBS curve interpolation method, comprising the steps of predicting parameters of a node at which an NURBS curve should arrive in a next period; performing velocity correction on the node parameters to enable a velocity error to be lower than a preset velocity threshold value; performing path correction on the node parameters to enable a path error to be lower than a preset path threshold value; and performing acceleration and jerk correction on the node parameters to enable an acceleration error to be lower than a preset acceleration threshold value and a jerk error to be lower than a preset jerk threshold value, thereby realizing curve interpolation. The invention also provides an NURBS interpolation device. By use of the method, processing requirements of high speed and high precision can be realized.

The invention provides a multi-mode continuously variable transmission with a rotating speed and torque coupling function. The multi-mode continuously variable transmission comprises an engine power input assembly, a hydraulic transmission assembly, a motor transmission assembly, a planetary gear assembly, an output component, a clutch component and a brake component, wherein the output end of theplanetary gear assembly is connected to the output component; the engine power input assembly, the hydraulic transmission assembly and the motor transmission assembly are connected to the input end of the planetary gear assembly through the clutch component; the engine power input assembly is connected to the hydraulic transmission assembly through the clutch component; and the clutch component and the brake component are used for providing a continuously changing transmission ratio of the engine power input assembly or/and the motor transmission assembly to the output component. Optimal power matching of a power source and optimal combination of power output modes can be achieved by switching the clutch component and the brake component and adjusting the displacement ratio of the hydraulic transmission assembly and the rotating speed/torque of a motor.

The invention discloses a cantilever type rotor used for a backing turbine air blowing loss test and relates to a cantilever type rotor. The cantilever type rotor used for the backing turbine air blowing loss test solves the problems that in a traditional wheel disk and blade rotor test, cost is high, the period is long, and lubricating of bearing system structures at the two ends is relatively complicated. A forward vehicle moving blade (11) is installed on a turbine overall blade disk; a backing turbine blade (12) is installed on the forward vehicle moving blade (11) through a middle ring (13); the turbine overall blade disk, the forward vehicle moving blade (11), the middle ring (13) and the backing turbine blade (12) jointly form a backing turbine double-layer overall blade disk (1); one end of a backing turbine output shaft (2) is connected with the backing turbine double-layer overall blade disk (1) through a disk shaft connection pin (3), and one end of the backing turbine output shaft (2) is suspended; and the backing turbine double-layer overall blade disk (1) is located on the outer sides of two supporting bearing supporting points of a whole rotor. The cantilever type rotor is used for the backing turbine air blowing loss test

The invention discloses a vehicle power output control method and a device. The method comprises the steps that when a unit coordination controller receives required power, the environment temperatureof the environment where a vehicle is located currently is obtained, a power mode corresponding to the environment temperature is determined, and a power output instruction containing the required power and power mode information is sent to a motor controller; and the motor controller is used for determining the engine rotating speed corresponding to the required power based on the power mode andsending the engine rotating speed to an engine controller, so that the engine controller controls an engine by utilizing the engine rotating speed to meet the power requirement of the vehicle; a unitcoordination controller is used for selecting a targeted power mode according to the using environment temperature of the whole vehicle and sending different power output instructions to the motor controller, and therefore the motor controller is used for selecting the rotating speed of the engine in a targeted mode according to the required power so as to meet the dynamic property requirement under the current environment temperature.

The invention discloses a method and system for reducing the influence of a speed error on integrated navigation precision in a lock losing process. The system comprises a global positioning system receiver, a micromechanical inertial measurement unit, a programmable logic controller, a digital signal processor and a CAN bus, the signal output end of the global positioning system receiver is connected with the signal input end of the programmable logic controller, the signal output end of the micromechanical inertial measurement unit is connected with the signal input end of the digital signal processor, the signal output end of the programmable logic controller is connected with the signal input end of the digital signal processor, and the signal output end of the digital signal processor is connected with the CAN bus. The method and system can obviously improve the navigation precision of an inertial navigation/global positioning satellite integrated navigation system in the lock losing state of a satellite.

The invention provides an integrated optimization algorithm for a dual-motor coupling driving system of an electric bus. An upper layer algorithm and a lower layer algorithm are respectively constructed by using a particle swarm optimization algorithm and a dynamic programming algorithm. According to the particle swarm optimization, particle coordinates represent to-be-optimized system parameters, the dynamic programming algorithm is used as a control strategy optimization algorithm under each particle, system power loss is used as a target function to optimize a control strategy of the coupling driving system, and it is guaranteed that each particle operates with the optimal control strategy. The obtained particles can reach the minimum power loss, weighted summation is carried out on the power loss and the power level to serve as an objective function of the particle swarm algorithm, and the particle coordinate corresponding to the minimum value of the objective function is sought by the particle swarm algorithm to serve as the optimal system parameter.