52 results about "Stall torque" patented technology

The invention discloses an upshifting control method and system for a wet type double-clutch automatic gearbox. The upshifting control method comprises the steps that when wet type double clutches enter a gear shifting torque alternating stage, the torque of the combination clutch is controlled to be increased by the first fixed slope till the torque of the combination clutch is larger than or equal to the static torque of an engine, and sliding friction PI control is conducted on the separation clutch at the same time; then whether the difference value between the rotation speed of an input shaft and the rotation speed of the engine is larger than or equal to the preset value is judged; in addition, when the difference value between the rotation speed of the input shaft and the rotation speed of the engine is larger than or equal to the preset value, it is indicated that the current engine rotation speed drops too low, and impact is prone to being produced if sliding friction control is still conducted; at the moment, the torque of the separation clutch is controlled to be decreased by the second fixed slope; the processes are repeated till the separation clutch is separated; and in this way, the impact phenomenon at the torque alternating stage in the accelerator stepping power upshifting process in the prior art can be effectively avoided, and the driving experience degree is improved.

The invention relates to a torque control method for artificial refueling before creeping speed of an electric automobile. The torque control method specifically includes the steps that under the conditions that a braking pedal and an accelerator pedal of the electric automobile are not treaded and the gear of a gearbox is engaged to the forward gear or the reversing gear, the electric automobileis accelerated to approach a target creeping speed according to a preset creeping control scheme, and at the moment, if the accelerator pedal is manually treaded, the torque of a driving motor is controlled as follows: 1, the currently required torque of the driving motor is calculated by checking a torque table under the normal driving condition of the electric automobile; and 2, the calculated torque and the driving motor torque corresponding to the creeping control scheme at the moment are compared, and the larger torque is selected as the actual torque of the driving motor. The torque control method can avoid the automobile weak feeling generated by reduced required torque when a driver treads an accelerator, so that driving stability and comfort are good.

The invention discloses a control method and system used for an excavator electric control pump. The control method used for the excavator electric control pump comprises the steps of calculating the current of front and rear pumps according to the pilot pressure value of each action; jointly calculating stall torque according to the pilot current value, the front and rear pump pressure and the stall value of the specific rotating speed of an engine; calculating the exceeding magnitude of the torque by taking the difference value between the calculated stall torque and the given torque of each gear of the engine and the differential of the difference value as fuzzy control input; carrying out fuzzy computing to distribute the reduced amount of the torque of the front and rear pumps according to the magnitude of the front and rear pump main pressure; enabling the sum of the reduced amount of the pilot expected torque of the two pumps to equal to the exceeding magnitude of the torque; calculating and outputting the magnitude of the current of the two pumps according to the deserved torque of the two pumps and the magnetite of the main pressure which are obtained by calculation. According to the control method and the control system used for the excavator electric pump, on basis of fuzzy control, the working performance of an excavator adopting the electric control pump is further improved.

The invention discloses a motor rotor winding method, which comprises a rotor rotating shaft, an insulating sleeve and a coil, wherein the insulating sleeve and the coil sleeve the rotor rotating shaft; the insulating sleeve is sequentially sleeved with a commutator and a winding skeleton; a magnetic pole group is arranged on the outer side surface of the winding skeleton; eight line through grooves are sequentially arranged on the winding skeleton along the circumference; the line through grooves are sequentially numbered N1, N2, N3, N4, N5, N6, N7 and N8 along the circumference; the commutator is sequentially provided with eight brass hooks along the circumference; the brass hooks are sequentially numbered P1, P2, P3, P4, P5, P6, P7 and P8 along the circumference; an included angles between the central line of an armature stack and the central line of the corresponding commutator is 4.5-8.5 degrees; the central line of the commutator is close to a left pole end of a rotor. By double groove-crossing, double groove-crossing is required for each winding of each hook, so that the resistance of a motor rotor winding is evenly distributed; the stalling torque deviation of the motor is relatively small; the energy loss of the motor is reduced; and the service lifetime of the motor is prolonged.

The invention provides a novel double-turbine hydraulic torque converter which is characterized in that the circulating circle diameter D is equal to 288-295mm. In a blade grid system, an intermediate flow line inlet angle beta p1 of a pump impeller blade is equal to 105 degrees-120 degrees, an intermediate flow line outlet angle beta p2 of the pump impeller blade is equal to 70 degrees-80 degrees, the intermediate ring surface inlet side thickness Hp1 of the pump impeller blade is equal to 4.8-5.8mm, and the intermediate ring surface outlet side thickness Hp2 of the pump impeller blade is equal to 2.5-3.5mm; an inlet angle beta1 of a primary turbine blade is equal to 88 degrees-98 degrees, an outlet angle beta2 of the primary turbine blade is equal to 148 degrees-155 degrees, the inlet side round head radius R1 of the primary turbine blade is equal to 4.6-5.6mm, and the outlet side round head radius R2 of the primary turbine blade is equal to 0.8-1.2mm; an intermediate flow line inlet angle beta1 of a secondary turbine blade is equal to 55 degrees-65 degrees, an intermediate flow line outlet angle beta2 of the secondary turbine blade is equal to 130 degrees-140 degrees, the intermediate ring surface inlet side thickness H1 of the secondary turbine blade is equal to 2.5-4.0mm, and the intermediate ring surface outlet side thickness H2 of the secondary turbine blade is equal to 1.5-2.5mm; and an inlet angle betas1 of a guide wheel blade is equal to 72 degrees-80 degrees, an outlet angle betas2 of the guide wheel blade is equal to 30 degrees-38 degrees, the inlet side round head radius Rs1 of the guide wheel blade is equal to 8.8-9.5mm, and the outlet side round head radius Rs2 of the guide wheel blade is equal to 0.6-1.0mm. The novel double-turbine hydraulic torque converter has the advantage that efficiency of a first peak reaches 0.78-0.81, efficiency of a second peak reaches 0.796-0.829, stall torque ratio is 4.05-4.15, pump impeller nominal torque under stall working conditions is 75-80N-m, and reliability, power performance and fuel economy of a whole machine are improved.

An asynchronous motor control method provided by the present invention comprises the following steps of S1, determining an asynchronous motor works at a magnetic flux unsaturation stage or a magnetic flux saturation stage according to a given stator current and a critical stator current; S2 obtaining a first slip ratio of the asynchronous motor at a maximum electromagnetic torque point, and controlling the asynchronous motor to work at the first slip ratio at the magnetic flux unsaturation stage; S3 calculating a second slip ratio of the asynchronous motor at the magnetic flux saturation stage, and controlling the asynchronous motor to work at the second slip ratio at the magnetic flux saturation stage. According to the present invention, and under a light load small torque, a field current is adjusted dynamically, so that the matching of the field current and a rotor current is at a maximum torque point, at the same time, the maximum torque point is basically an optimum electromagnetic torque point, and accordingly, the energy utilization rate is improved, namely, the efficiency of the motor is improved under the small torque. The method enables the power supply energy consumption to be saved to a large extent when being used in the crowded vehicle condition of an actual city.

The invention discloses a new energy vehicle anti-slope auxiliary control method. After the anti-slope system recognizes the start-up slope condition, the motor is controlled to output the locked-rotor torque to prevent the slope; When the system fails to maintain the anti-slope stall torque failure, and the vehicle does not start or the brake is applied or the handbrake is applied, the vehicle body stability controller is used to control the brake actuator to output the driving braking force to prevent the slope; when the anti-slope system recognizes When the anti-slip slope of the body stability controller is timed out and the vehicle has not yet stepped on the brake or pulled up the handbrake, the electronic parking controller is controlled to control the slope, and the electronic parking controller controls the brake actuator to continue outputting mechanical braking force for parking. When the driver operates the vehicle to start or step on the brake or apply the handbrake, the system automatically releases the motor stall torque or mechanical braking force. The invention solves the problem of insufficient reliability of the slope auxiliary function caused by relying solely on the motor to prevent the slope from slipping, and greatly improves the driver's operating comfort and safety.

The invention discloses a pneumatic digital-display torque wrench, which consists of a dynamic torque measuring device and a static torque measuring device, which are coaxial torque measuring devices. Dynamic torque and static torque can be measured by using one torque wrench, a power source of a static torque measuring sleeve is coaxial with the static torque measuring sleeve, and power can be directly transmitted through a cylinder so that errors and energy consumption caused by power transmission through belts and the like can be avoided. In addition, a casing of the pneumatic digital-display torque wrench can be relatively regularly cast into a whole, and thereby tightness, environmental interference resistance and stability of the pneumatic digital-display torque wrench are improved.

The invention discloses a vehicle speed control method for a four-wheel hub electric vehicle. A suitable vehicle speed estimation module is selected through the current driving mode, that is, a UKF-based vehicle speed estimation module or a wheel speed-based vehicle speed estimation module, and the current vehicle speed is estimated in real time; at the same time , smoothing and filtering the vehicle speed jump when the driving mode is switched; then, with the desired vehicle speed as the control target, the PID controller is used to control the output of the total torque; finally, the total torque is input to each The motor controller, and then controls the speed of the electric vehicle to achieve the desired speed.

The invention discloses an automatic parking control method, which includes: monitoring the working state information of the vehicle; judging whether the working state information satisfies the preset automatic parking condition; if so, obtaining the slope information of the road section where the vehicle is located and vehicle quality information; calculate the motor output torque required to keep the vehicle stationary according to the slope information and the vehicle quality information; control the motor to output a locked-rotor torque opposite to the rotation direction of the wheels according to the output torque; The transmission gear of the control vehicle transmission is connected to the output shaft of the motor, so that the transmission increases the locked-rotor torque, and outputs the increased locked-rotor torque to the wheel end for maintaining The vehicle is stationary. The technical solution provided by the invention can realize the value-added function of automatic parking by using the existing devices of the vehicle, without the need of specially equipped with an ESP system for this purpose, and effectively reduces the cost of the whole vehicle.

The invention discloses a three-phase asynchronous motor capable of increasing stall torque and reducing stall current, comprising a frame, an end cover, a casing, a rectifier, a junction box, a rotating shaft, and an eccentric drive part. The front end of the frame is mounted with bolts There is a vertical end cover, and the rear end of the base is bolted to a horizontal cover. While meeting the normal power demand, the present invention can increase the locked-rotor torque and reduce the locked-rotor current. When the motor is locked, the torque can be increased by itself, so as to force the motor to overcome the excessive load and resume normal rotation. At the same time, when the motor is locked, it can connect the consumption resistance to the circuit by itself, which can reduce the current of the locked rotor and reduce the damage to the stator winding, thus prolonging the service life of the motor, and also saving the maintenance time and reducing the trouble. Necessary resources are wasted, so as to be more environmentally friendly and efficient.

The invention discloses a wire control braking system and a braking method thereof. The wire control braking system comprises a control system and a mechanical actuating mechanism, wherein the control system comprises a main control circuit module and a motor drive module; the main control circuit module controls the rotating speed, the rotating direction and the output torque of a motor through duty ratio signals of PWM_A and PWM_B, controls whether to output the duty ratio signals through an enabling control port CON, and judges stalling and loading conditions of the motor through feedback current signals; the mechanical actuating mechanism comprises a drive motor, a speed-reducing torque-increasing structure and a screw propelling structure, and the screw propelling structure is a non-self-locking structure; and when the torque is decreased, by reducing the set PWM duty ratio and with the help of the repulsion of pressing force, the pressing force between a friction plate and a braking disc can be adjusted to the required stalling torque. Through the technique provided by the invention, the self-adjustment of a gap between the friction plate and the braking disc and the self-adaptive control of the pressing force can be achieved, and the response time for adjusting the pressing force is shortened.