8results about How to "Avoid speed fluctuations" patented technology

This application relates to the field of vehicle braking component testing technology, and particularly to a calibration and testing device and method based on an electric vehicle electronic fuel dispenser. The calibration and testing device includes a fixing fixture, a wiring harness connection unit, a host computer system, a transmission unit, and a PLC control system. The fixing fixture is used to hold the electric vehicle electronic fuel dispenser to be tested. The wiring harness connection unit includes a power supply and a calibration programmer. The host computer system is connected to the calibration programmer via a universal serial bus port. The transmission unit includes a positioning fixture, a telescopic cylinder, and a servo motor. One end of the positioning fixture is fixedly connected to the servo motor, and the servo motor is fixedly connected to the telescopic cylinder. One end of the PLC control system is connected to the host computer system via a network cable. This application ensures the synchronization and consistency of calibration and testing procedures for different fuel dispensers, and allows for intuitive comparison of line graphs of test results from different angles of the same fuel dispenser, achieving fully automated operation and quantitative performance evaluation.

The invention provides a hydrostatic driving method and device for a snow pressing vehicle and a hydraulic system, and relates to the technical field of snow pressing vehicles. The method comprises the steps that the actual rotating speed of an engine is detected and compared with a preset optimal rotating speed range, and a rotating speed deviation signal is generated; based on the rotating speed deviation signal, the displacement adjusting amount of a variable pump and the displacement adjusting amount of a variable motor are calculated through an incremental PID control algorithm; dynamically adjusting the displacement of a variable pump and a variable motor according to the displacement adjusting quantity so as to realize stable control on the rotating speed of the engine; wherein when the load is increased, the variable displacement motor is adjusted to increase the displacement, and if the displacement of the motor reaches the maximum, the variable displacement pump is adjusted to reduce the displacement; when the load is reduced, the variable displacement pump is adjusted to increase the displacement, and if the pump displacement reaches the maximum, the variable displacement motor is adjusted to reduce the displacement. According to the method, the pump and the motor are cooperatively controlled through the incremental PID, the rotating speed of the engine is stabilized, efficient operation of the engine is maintained, and therefore the power utilization rate and the fuel economy are improved.

This utility model discloses a device for electroplating and film penetration of composite current collectors, belonging to the field of composite current collector technology. It includes: a base, a lifting assembly on one side of the top of the base, a storage assembly on the lifting assembly, a tape roller detachably mounted on the storage assembly via a fixing assembly, an unwinding roller on one side of the storage assembly, and a gantry frame fixedly mounted to the base on one side of the unwinding roller. The top of the gantry frame is equipped with a cutting mechanism for cutting the tape and an adsorption moving assembly for adsorbing one end of the cut tape. The height of the tape roller can be flexibly adjusted by the lifting assembly (vertical frame + lifting screw + slider), and the tape roller is automatically stored in conjunction with the storage assembly (cover plate + storage box). When not in use, the lifting assembly lowers the tape roller into the storage box, and the cover plate and storage box close to form a protective space. When in use, the lifting assembly raises the tape roller to the working height, eliminating the need for manual handling throughout the process.

This invention relates to the field of ship dynamic positioning technology, specifically disclosing a method and system for ship dynamic positioning control applicable to diesel engine-driven vessels. The method includes: S1: acquiring environmental data, calculating the total environmental load force, and determining the upper limit of the thruster and its corresponding upper limit of the diesel engine speed; S2: determining the lower limit of the theoretical diesel engine speed based on the upper limit of the diesel engine speed, and calculating the lower limit of the diesel engine speed and its corresponding lower limit of the thruster thrust based on the lowest stable diesel engine speed; S3: acquiring the initial thrust requirement of the thruster, determining the final thrust of the thruster based on the initial thrust requirement, the upper limit of the thruster thrust, and the lower limit of the thruster thrust, and driving the thruster through the diesel engine according to the final thrust of the thruster to achieve ship positioning control. This invention can fully utilize the high thrust advantage of diesel engines and avoid the shortcomings of slow speed adjustment, balancing thrust requirements and response speed without changing the hardware.

The application discloses a new energy commercial vehicle power take-off control method and system, the method comprising: the vehicle controller obtains the power take-off working state and the driver operation information, and determines the driving power assist mode or the parking power take-off mode; the VCU controls the multi-stage mapping according to the throttle opening degree, divides the throttle opening degree into the idle speed area and the speed regulation area, linearly maps the throttle opening degree to the power take-off speed in the speed regulation area, and locks the power take-off speed to the corresponding target idle speed value according to the preset interval where the stable speed is located after the throttle is released; meanwhile, the VCU receives the steering wheel '+' and '-' switch signals, and responds to the switch signals to perform the step-by-step fine adjustment when the throttle opening degree is zero; and the idle speed value before power-off is memorized, and is automatically restored after the next power-on. The application realizes the intelligent and fine control of the power take-off in the driving power take-off and the parking power take-off two modes, and improves the working efficiency and the operation convenience of the upper-mounted equipment.

The utility model discloses a motor magnetic steel dynamic balance testing device, which belongs to the technical field of motor detection and comprises a testing platform, a bottom supporting plate is fixed at the top of the testing platform, and a top supporting plate is rotatably connected to the top of the bottom supporting plate. Motor shaft supporting plates are slidably connected to the two ends of the top of the testing platform, a limiting mechanism used for limiting rotation of the top supporting plate is arranged at one end of the outer side of the top supporting plate, and through operation of an adjusting mechanism and a driving motor, a belt can drive a rotor to rotate in the bottom supporting plate and the top supporting plate. Rotors with different diameters can rotate, the problem of rotating speed fluctuation or slipping caused by belt looseness after long-term use can be avoided, the rotors are ensured to rotate at a constant speed, dynamic balance detection data are more reliable, the supporting distance between the two motor shaft supporting plates can be rapidly adjusted, and the device is adaptive to the motor rotors with different lengths.

The application discloses a multi-margin coordinated control method and system of a variable-speed pumped storage unit, and the method comprises the following steps: calculating a frequency modulation power demand according to a power grid frequency and determining a first rotational speed change direction; determining an efficiency optimal rotational speed according to a water head or lift, an active power and a coordinated relationship and determining a second rotational speed change direction; judging whether the two directions are opposite, if opposite, determining a direction conflict state, and determining a distribution proportion of a frequency modulation power borne by a converter according to three margins; under the direction conflict state, adjusting an efficiency optimal rotational speed tracking weight according to a frequency deviation and a frequency change rate, obtaining a rotational speed reference value after weighting and superimposing a frequency modulation rotational speed correction amount; taking a product of the distribution proportion and the frequency modulation power demand as a converter power regulation amount, taking a difference between the frequency modulation power demand and the converter power regulation amount as a speed regulator power regulation amount, and generating corresponding adjustment instructions. The method can take into account fast frequency modulation, operation efficiency and hydraulic and electrical safety boundaries.