38results about How to "Improved Torque Accuracy" patented technology

The method of estimating and controlling driveline torque in a continuously variable hydro-mechanical transmission uses pressure data and other metrics of a hydrostatic power unit of the transmission in lieu of actual driveline torque data. A mechanical efficiency of the transmission is determined as a function of whether the power unit is operating in a power generation or regeneration mode, and the torque output of the power unit is estimated from that and other hydrostatic parameters. This is used to estimate a torque output of a planetary power unit of the transmission, and the torque on an output member of the driveline is then estimated using that value, and appropriate corrective action taken.

A two-stage locking electric screwdriver, with its main improved features as follow: the electric screwdriver has pre-locking and locking functions; the torque settings of the electric screwdriver can be easily modulated, and meanwhile the torque accuracy and energy efficiency can be improved; the torque modulation type is external modulation, so that the torque modulation can be carried out externally and even the torsion spring can be replaced. Meanwhile, the component structures inside the electric screwdriver is improved through a design that the motor directly drives the clutch and then drive the screwdriver head unit, and that an internal gear clutch is used to replaced the gear unit and clutch unit, so that the number of parts is dramatically reduced to save production cost. During general rotation, the electric screwdriver will not drive the clutch unit, and when the torque jumps to the set value, the internal gear clutch rotates and generates a torque.

The invention discloses a screw fastening system and method. The screw fastening system comprises a speed giving unit, a torque giving unit, a filtering unit, a speed torque control unit, a speed torque feedback unit, a current control unit, a speed weight unit, a torque weight unit, a motor, a current detection unit, a speed sensor, and a torque sensor; an electric wrench is connected to one endof the motor; the input end of the speed sensor, the input end of the torque sensor and the input end of the current detection unit are respectively connected with the motor; the output end of the current detection unit is connected with the current control unit and provides a current feedback value for the current control unit; the speed torque control unit is connected with the current control unit; and the current control unit is connected with the motor. According to the screw fastening system and method, by arranging the speed torque control unit, the speed torque feedback unit and the current control unit, the construction torque of the to-be-fastened screw and the rotating speed of the motor are controlled at the same time, so that the impact torque is reduced, higher torque precision is guaranteed, and the screw tightening effect is effectively improved.

The invention discloses a return difference measuring device and method for harmonic gear transmission. According to the invention, the input end of a wave generator of a harmonic reducer is connectedwith an input shaft fixing device through a key, the output end of a flexible gear of the harmonic reducer is fixedly connected with a loading rod, and an angle measuring device is connected to the loading rod to record the rotating angle of an output shaft of the harmonic reducer; and two force arm rod heads of the loading rod are sequentially provided with hydraulically-driven loading devices,and the loading devices are used for loading the output shaft. The return difference measuring device can adapt to the angle change of the loading rod by adopting a mode that a ball flange is tangentto the output plane of a hydraulic cylinder, and the loading rod head adopts a mode of vertically fixing a welding screw to ensure the accuracy of output torque measurement. The device is not only suitable for return difference measurement of harmonic gear transmission, but also suitable for return difference measurement of coaxial output gear transmission and is driven in a hydraulic mode, the rotation angle is measured by an angle encoder, and the torque is calculated by a force sensor. The device is simple in structure, convenient to install, high in measurement precision and high in practicability.

The invention discloses a reaction force arm for a fixed torque wrench and belongs to the field of equipment tools. The arm comprises an L-shaped main arm body, a location gear ring is arranged on a planar arm body of the main arm body, a dovetail groove is formed in an inclined arm body of the main arm body, and a location hole is formed in the bottom of the dovetail groove. The reaction force arm further comprises a dovetail moving arm body meshed with the dovetail groove, a location installation hole is formed in the middle of the moving arm body, an elastic location device is installed in the location installation hole, a threaded groove and a locking knob matched with the threaded groove are formed in one side of the upper end of the moving arm body, and a baffle is arranged on one side of the lower end of the moving arm body. The reaction force arm adopts the dovetail groove structure design, the length of the force arm is adjusted by stretching and retreating of the moving arm body to adapt to different work conditions, and the working efficiency is improved. The tooth shape is designed by adopting a 30-degree pressure angle, so that the gear strength is improved. The main arm body adopts the flexible arc anti-torque design, so that the torque accuracy is improved.

The invention relates to a torque on-line measurement method and device for a torque-controllable impact wrench. According to the method, aiming at the working environment of a twisting operation site and the elastic stage of bolt working, multiple sets of thread pairs to be twisted and workpieces in the same batch are twisted by the same process, and an accurate dynamic torque and rotation angle relational expression is measured, established and stored; and in the measuring process, an on-line measuring device detects the accumulated rotating angle of the bolt/nut in the impact torque application process in real time, the accumulated rotating angle is substituted into the dynamic torque and rotation angle relational expression, and the accumulated torque of the impact torque application of the controllable torque impact wrench is calculated and displayed. According to the invention, on-line measurement of the accumulated torque of the impact wrench is innovatively realized, the torque control accuracy is ensured, and the application range of the impact wrench is expanded.

An assessment of 'base neutral ' is made when the difference between a command oil pressure and the actual oil pressure of a hydraulic clutch is within a prescribed microvalue range, and when the difference is outside of the microvalue range, an assessment of 'raise base' is made if the command oil pressure is greater than the actual oil pressure, and an assessment of 'lower base' is made if the command oil pressure is less than the actual oil pressure. An assessment of 'raise sub' is made when the command torque processed using a low-pass filter tends to be positive for at least a prescribed time, an assessment of 'lower sub' is made when the command torque tends to be negative for at least a prescribed time, and the tendency of the command torque to increase or decrease is assessed. When the assessment is 'raise base', the command oil pressure corresponding to the command torque is determined using a pressurization characteristic in hysteresis characteristics, and when the assessment is 'lower base ', the command oil pressure is determined using a depressurization characteristic. When the assessment is 'base neutral', the command oil pressure is determined using the pressurization characteristic when the assessment of 'raise sub' has been made, and the depressurization characteristic is used when the assessment of 'lower sub' has been made.

The invention provides a torque transmission method and device. The torque transmission method includes the following steps: obtaining a torque compensation parameter corresponding to engine torque from a preset storage space, calculating according to the torque compensation parameter to obtain target torque, according to the target torque, controlling a target clutch, and transmitting the enginetorque. According to the torque transmission method, the torque compensation parameter corresponding to the torque of the engine is obtained from the preset storage space, calculation is performed according to the torque compensation parameter to obtain the target torque, and finally, according to the target torque, the target clutch is controlled, and the torque of the engine is transmitted, a control strategy of a dry double clutch transmission is avoided to apply to a wet double clutch transmission, the degree of accuracy of transmission of the engine torque of the wet double clutch transmission is improved, and the safety of driving of a vehicle is improved.

When controlling the driving of a permanent magnet synchronous motor, in order to estimate magnet's magnetic flux with high accuracy and robustness against harmonic components of induced voltage and errors in setting constants for resistance and inductance without using a voltage sensor, a speed sensor, and data from magnetic field analysis or experiments, this driving device for a permanent magnet synchronous motor has capability of improving torque accuracy by estimating the amount of magnetic flux or the temperature of the magnet in the permanent magnet synchronous motor on the basis of a voltage command value and speed information about the permanent magnet synchronous motor, in a state in which a current command value when the torque command value is zero is being output, so as to estimate the magnet's magnetic flux or the temperature with high accuracy and robustness against harmonic components of induced voltage and errors in setting constants for resistance and an inductance without using the data from magnetic field analysis or experiments.

[Problems] To provide a torque measurement device capable of more accurately specifying positions of reflectors which are attached to a rotating body, and more accurately obtaining a torque of the rotating body.

[Means for Solving Problems] A pair of reflectors (14a, 14b) is provided on the surface of the rotating body (13) and has a spacing in the axial direction, reflected light data obtained by reflection of reflection patterns in the pair of reflectors (14a, 14b) is input and stored, a point of minimizing AIC is determined for a model of the reflected light data from the rotating body (13), and existence regions of the pair of reflectors (14a, 14b) are detected. Then, a twist amount of the rotating body (13) is calculated from the reflector positions specified by the detected existence regions of the pair of reflectors (14a, 14b), and the torque is calculated from the calculated twist amount of the rotating body.

The invention relates to a method for determining the crosstalk behaviour of a hydrostatic dual clutch transmission of a motor vehicle which has two partial transmission clutches (4, 5) that are each arranged between a drive unit (2) and a partial transmission (8, 9), wherein the two partial transmission clutches (4, 5) are each actuated independently of one another via a partial transmission clutch actuator (6, 7), wherein during the actuation, the actuation pressure (p4, p5) from the partial transmission clutch actuator (6, 7) acting on the partial transmission clutch (4, 5) and a clutch actuation path travelled by the partial transmission clutch (4, 5) are determined, from which a crosstalk factor (Deltax4, Deltax5) is determined for each partial transmission clutch (4, 5). In a method for determining the crosstalk behaviour of a hydrostatic dual clutch transmission, wherein said behaviour can be determined both at the belt end and during the driving operation in the motor vehicle, each crosstalk factor (Deltax4, Deltax5) is derived from a characteristic map (K4, K5) which is generated depending on the actuation pressure (p4, p5) of both partial transmission clutches (4, 5).

The invention discloses an inductance parameter obtaining method and device. The method comprises the following steps: acquiring a current electromagnetic power value of the permanent magnet synchronous motor; determining an electromagnetic power difference value between the current electromagnetic power value and a predetermined electromagnetic power value, wherein the electromagnetic power difference value is a difference value between an absolute value of the current electromagnetic power value and an absolute value of the predetermined electromagnetic power value; inputting the electromagnetic power difference value into a proportional-integral controller to obtain a target inductance parameter output by the proportional-integral controller, wherein the target inductance parameter value is the difference value between the direct-axis inductance parameter value and the quadrature-axis inductance parameter value of the permanent magnet synchronous motor. According to the method, thetechnical problem that the torque precision of the permanent magnet synchronous motor is reduced due to the fact that an existing permanent magnet synchronous motor inductance parameter identificationmethod is large in error is solved.

The invention provides an obtaining method for transmission chain high-speed shaft torque of a double-fed wind turbine generator, comprising the following steps: obtaining electromagnetic torque of the double-fed wind turbine generator; and obtaining the high-speed shaft torque of the double-fed wind turbine generator. According to the obtaining method for transmission chain high-speed shaft torque of the double-fed wind turbine generator, a torque measurement device is not required additionally, so that the obtaining method is rapid in convergence, accurate in calculation, high in reliability, suitable for obtaining torque under grid faults without depending on complete mathematical models in conventional systems, and higher in adaptive ability.