39results about How to "Reduce startup noise" patented technology

The invention discloses an ion wind indoor unit, an ion wind air conditioner system and a control method, and relates to the technical field of refrigerating and heating equipment. In order to solve the problems that an existing air conditioner indoor unit is large in occupation size, large in noise and the like, the ion wind indoor unit is designed. The ion wind indoor unit comprises a shell and an indoor heat exchanger arranged in the shell; an ion wind generator is arranged on the upwind side and / or downwind side of the indoor heat exchanger, and carries out corona on air entering the interior of the generator to generate ion wind and blow out the iron wind so as to achieve convection heat exchange of indoor air; and meanwhile, the ion wind air conditioner system with the ion wind indoor unit and the control method of the air conditioner system are provided. The ion wind indoor unit can reduce the starting noise of air and eliminate electromagnetic noise of a motor and vibration noise of a structural part; use comfort is greatly improved; and meanwhile, the indoor unit structure is simplified, the occupied size of the indoor unit is reduced, the attractiveness of the indoor unit is improved, and the production cost and the assembling cost are reduced.

The invention discloses an electronic-parking-brake system with the automatic parking function, a starting method and a vehicle. According to the electronic-parking-brake system, during starting, a vehicle is converted from a brake state acted by the electronic-parking-brake system into a brake state acted by the automatic parking function, the vehicle begins to be started from the brake state acted by the automatic parking function, the vehicle can be started stably, starting noise of the vehicle is lowered, and the driving experience is improved.

The invention provides a control system and pre-start method of a blade electric vehicle. The method comprises the steps that 1, the vehicle state information is collected; and 2, whether to take the pre-start strategy or not is determined according to the vehicle state information. A motor gives out a small calibrated torque before the vehicle starts, so that gears of a transmission system of the vehicle are all in an engaged state, various start patterns start according to the intention of a driver, and shaking caused by impact to the transmission system of the vehicle is reduced; and meanwhile, mechanical abrasion can be reduced, and start noise can be lowered. There is no need to change the structure of an existing vehicle or additionally arranging hardware equipment like sensors, and implementation is easy. Through the control method, the vehicle can start quickly and stably, and meanwhile, coasting during starting of the vehicle can also be avoided.

The invention discloses double anti-wear automobile lubricating oil. The lubricating oil comprises, by mass, A), 35-94 parts of a low-viscosity base oil having a high viscosity index, B), 2-15 parts of a engine oil composite agent, C), 0.01-3 parts of a organic molybdenum mixture, D), 0.5-5 parts of a saturated and high-viscosity complex lipid, E), 0.5-10 parts of a diester, F), 0.5-10 parts of ahigh-viscosity polyolefin, G), less than or equal to 2 parts of a alcohol blocked phenolic ester having high molecular weight and H) 2-10 parts of a viscosity index improver with high shearing performance. The double anti-wear automobile lubricating oil provided by the present invention is used for engines of the automobiles, such that starting wear of the engine is substantially improved, the wear of the engine in a operation condition of high rotary speed and high torsional moment is reduced. In addition, according to the present invention, a starting noise level is reduced by 12%; an outside noise level is reduced by 6.8% and an interior noise level is reduced by 8.4% during a high-speed operation; a oil change period of the engine oil is prolonged more than one time.

A method for controlling a fan in a fan start-up stage including a first time period and a second time period comprises the following steps of: during the first time period, continuously providing a first driving signal to drive the fan; and during the second time period, continuously providing a second driving signal to drive the fan; wherein, during the first time period the signal value (driving energy) of the first driving signal gradually decreases until being equal to the signal value of the second driving signal, and the signal value of the first driving signal is initially greater than the signal value of the second driving signal. A fan is also disclosed.

The invention discloses a method for controlling a direct-current (DC) frequency conversion air condition compressor. The method comprises two position estimation methods, namely a position estimation method A and a position estimation method B. The two position estimation methods are used and changed over as follows: in the process of starting and accelerating of the compressor, the position estimation method A is adopted when the compressor starts, after being started, the compressor starts to accelerate, when the revolving speed of the compressor is less than and equal to V1, the position estimation method A is still adopted, and when the revolving speed of the compressor is greater than V1, the position estimation method B is adopted; after the compressor runs at an intermediate speed or a high speed for a period of time, demands for system cooling or heating are reduced, at the moment, the compressor starts to speed down, in the process of speeding up, the revolving speed of the compressor is greater than and equal to V2, the position estimation method B is adopted, and when the revolving speed of the compressor is less than V2, the position estimation method A is adopted, wherein V1 is greater than and equal to 360 rpm (revolutions per minute), and less than and equal to 1200 rpm, and V2 is greater than and equal to 180 rpm, and less than and equal to 600 rpm. The DC frequency conversion air condition compressor has the characteristics of flexibility in operation and good comfort.

The invention discloses an electromagnetic heating apparatus and a driving circuit of a power switch tube used in the electromagnetic heating apparatus. The driving circuit comprises an integrated driving chip and a control chip, wherein the integrated driving chip has a driving output port, a chip power supply port, a driving voltage control signal input port and a main control signal input port; the integrated driving chip outputs a driving signal to the power switch tube to drive the switch-on and switch-off of the power switch tube through the driving output port; the integrated driving chip is integrated with a voltage conversion unit for changing the driving voltage corresponding to the driving signal; and the control chip controls the integrated driving chip to enable the power switch tube to be operated in an amplified state when the power switch tube is started, and controls the integrated driving chip to enable the power switch tube to be operated in a saturated switch-on state after the starting of the power switch tube is completed. By integrating the integrated driving chip with the voltage conversion unit on the driving circuit, the pulse current in the switch-on moment of the power switch tube can be lowered, and damage of the power switch tube can be avoided.

The invention discloses a method and a device for start control of a DC fan in an air conditioner indoor unit. The method comprises the following steps: S1, receiving a DC fan start command; S2, according to the start command, controlling the DC fan to start in an initial duty ratio; S3, detecting feedback information of the DC fan; S4, according to the feedback information, determining whether the DC fan starts successfully; S5, and if the DC fan is determined not to start successfully, improving the initial duty ratio according to a preset rule, and executing the steps S3-S5 repeatedly, until the DC fan starts successfully. The method for start control of a DC fan in an air conditioner indoor unit can reduce start noise of the DC fan.

The invention discloses a high- aerodynamic performance wind turbine blade, and belongs to the technical field of wind power utilization. A three-dimensional structure on the surface of an airfoil part of the blade is formed by ten airfoil surface airfoil curves in a continuous and smooth transition mode; each airfoil surface airfoil curve is composed of a leeside curve and a windward side curve; an original point of a coordinate system is defined as a leading edge point of the first airfoil surface airfoil curve, the extending direction of the blade is defined as the positive direction of a Z axis, the direction of a wind rotor shaft is defined as the direction of a Y axis, and the direction which is perpendicular to both the Z axis and the Y axis is defined as the direction of an X axis; the ten airfoil surface airfoil curves are parallel to an X0Y plane respectively and are arranged in sequence in the positive direction of the Z axis; each of the ten airfoil surface airfoil curve rotates a certain degree with the leading edge point of the airfoil surface airfoil curve as the center in a plane which passes through the leading edge point of the airfoil surface airfoil curve and is perpendicular to the Z axis. The high-aerodynamic performance wind turbine blade has the advantages of low start-up wind speed, low work noise and smooth power output characteristics on the basis of high aerodynamic performance.

The invention discloses a washing machine control method and a washing machine. The washing machine comprises a water discharge pump and is characterized in that an impeller driven by a water discharge pump motor to rotate is mounted on the water discharge pump, and the impeller can be controlled to change rotation direction; during washing machine water discharge, the detected value of the working currents of the water discharge pump motor is acquired and compared with a set value to judge whether foreign matter interfering impeller rotation exists or not, the rotation direction of the impeller is changed when interference occurs to discharge the foreign matter. The control method has the advantages that the foreign matter in an impeller cavity is discharged by controlling the rotation direction of the water discharge pump impeller to avoid the noise problem caused by the fact that the foreign matter interferes the impeller, and the method is suitable for being popularized and used.

The invention provides a motor control method, a motor module using the motor control method and a radiating device. The motor control method includes the following steps: providing the motor module; adjusting the control voltage into the driving voltage through a modulator, wherein the step includes the processes that a voltage controller judges whether a specific rotating speed is larger than a preset rotating speed or not; when the preset rotating speed is equal to or larger than the preset rotating speed, the direct-current voltage is adjusted into a first corresponding direct-current voltage corresponding to the special rotating speed through a motor controller and is provided for a motor; when the special rotating speed is smaller than the preset rotating speed, the direct-current voltage is adjusted through the motor controller into a second corresponding direct-current voltage corresponding to the special rotating speed, an adjusting signal corresponding to the special rotating speed is output to the modulator, and the modulator adjusts the second corresponding direct-current voltage with the adjusting signal and outputs the driving voltage to the motor; the working period of the adjusting signal is smaller than 100%. By means of the adjusting design of the embodiment, the motor module can run at a low speed, and the starting noise of a fan is accordingly reduced.

The invention provides a compressor in a mode that springs impact an air suction mouth to directly suck air, and the compressor comprises a casing body. A cassette mechanism assembly is arranged in the casing body; the outer wall of the casing body is connected with an air suction pipe; an anechoic cavity is arranged in the casing body corresponding to a pipe mouth of the air suction pipe. The invention is characterized in that a connecting pipe is connected with the pipe mouth of the air suction pipe and the air suction mouth of the anechoic cavity; one end of the connecting pipe is provided with a turned-over edge to mantle the pipe mouth of the air suction pipe, and the other end of the connecting pipe forms an even joint with the air suction mouth of the anechoic cavity; the outer wall of the connecting pipe is provided with the springs; the springs impact a turned-over edge mouth of the connecting pipe to be tightly pasted to the inner wall of the casing body. The invention overcomes the problems of easy distortion and aging, short service life and high cost in high temperature as the prior art adopts the structure that a ripple pipe directly sucks the air. The invention can also reduce noise, and is especially suitable for the improvement of a piston type compressor.

The invention discloses a thickened wind turbine blade with high pneumatic performance, which belongs to the technical field of wind energy utilization. A three-dimensional structure on the surface of a blade wing-shaped part is generated by continuous and smooth transition of ten wing-shaped surface wing-type curves; each wing-shaped surface wing-type curve consists of a leeward surface curve and a windward surface curve respectively; an original point of a coordinate system is defined as the front edge point of a first wing-shaped surface wing-type curve; the leafing direction of the blade is defined as the positive direction of an axis Z; the direction of a wind wheel shaft is defined as the direction of an axis Y; another direction which is vertical to the directions of the axis Z and the axis Y is defined as the direction of an axis X; ten wing-shaped surfaces are parallel to a plane X0Y respectively, and are arranged in sequence along the positive direction of the axis Z; the ten wing-shaped surfaces rotate by certain angles by taking the front edge points in a plane which crosses respective front edge points and is vertical to the axis Z. According to the thickened wind turbine blade, the front and back edge points of blade wings are thickened, so that the blade has high bending resistance and fatigue damage resistance on the premise of ensuring high pneumatic performance; meanwhile, the blade has the characteristics of low starting air speed and low working noise.

Disclosed is a boost control device of a motorcycle starting motor. A microcontroller is used for controlling a boost loop, original voltage of a storage battery is boosted by the boost loop and is supplied to a starting motor with high voltage specifications, and flexible starting control is conducted to the starting motor. The starting motor with high voltage specifications can provide sufficient stable torque force for an engine, so that the starting motor cannot require high current for the storage battery at the moment of starting, the starting smoothness of the starting engine and stability of a motorcycle electric power system and engine starting are improved, and starting noise and abrasiveness of a starting gear set are reduced relatively.

The invention relates to an elevator band-type brake control parameter generation method, device and system and computer equipment and a storage medium. The method comprises the following steps that aband-type brake start instruction is sent to a band-type brake controller, when the elevator band-type brake is started to be started, the current output by the band-type brake controller is recordedas the minimum starting current of the elevator band-type brake; a band-type brake release instruction is sent to the band-type brake controller, when the elevator band-type brake is started to be released, the current output by the band-type brake controller is recorded as the minimum maintain current of the elevator band-type brake; the starting current parameter and the maintaining current parameter of the elevator band-type brake are generated according to the minimum starting current and the minimum maintaining current, the starting current parameter is used for enabling the band-type brake controller to adopt the adaptive starting current to control the elevator band-type brake to start, and the maintaining current parameter is used for enabling the band-type brake controller to adopt the adapter maintaining current to control the elevator band-type brake and maintain an opening state. By adopting the method, the band-type brake controller can adopt the starting current matchedwith the elevator band-type brake and the maintaining current to control the elevator band-type brake.

The electromagnet brake comprises a shell, a movable core assembly arranged in the shell in a sliding mode, an electromagnetic coil arranged in the shell and arranged outside the movable core assembly in a sleeving mode, and an end cover arranged at the end of the shell, the movable core assembly comprises a movable core main body arranged in the shell in a sliding mode and a movable core guide rod arranged at the end of the movable core main body, and the movable core guide rod is connected with the movable core main body in a sliding mode. An end cover opening is formed in the end cover, one end of the movable core guide rod is fixedly connected with the movable core main body, the other end of the movable core guide rod penetrates through the end cover opening and extends out of the end cover, and a magnetic isolation sheet and a buffer gasket are further arranged between the movable core main body and the end cover. Compared with the prior art, the electromagnetic valve is simple in structure and convenient to operate, the impact influence between the movable core assembly and the end cover when the electromagnetic valve is started is reduced by arranging the magnetism isolating sheet and the buffering gasket, starting noise is reduced, and the service life of the device is prolonged; and through the arrangement of the magnetic isolation sheet, the influence of magnetic residue of the electromagnetic coil after power failure is reduced, the reset speed of the movable core assembly is increased, and the brake response time is shortened.

The invention discloses a double anti-wear vehicle lubricating oil, comprising: A) 35-94 parts by mass of low-viscosity base oil with high viscosity index, B) 2-15 parts by mass of engine oil compounding agent, C) 0.01- 3 parts by mass of organic molybdenum mixture, D) 0.5-5 parts by mass of saturated high-viscosity complex ester, E) 0.5-10 parts by mass of dibasic acid ester, F) 0.5-10 parts by mass of high-viscosity polyolefin, G) Less than or equal to 2 mass parts of high molecular weight alcohol shielding phenol ester and P) 2-10 mass parts of viscosity index improver with high shear resistance. The double anti-wear vehicle lubricating oil of the present invention is used on motor vehicle engines, which can significantly improve engine start-up wear and reduce engine wear under high-speed and high-torque operating conditions; the start-up noise is reduced by 12%, and the noise outside the vehicle is reduced by 6.8% during high-speed operation %, the noise in the car is reduced by 8.4%, and the engine oil change period is more than doubled.

The invention relates to a motor for an electromobile. An opening slot of the motor for the electromobile is provided of a magnetic structure, and the reluctancy Kr of the magnetic structure ranges from 0.7 to 0.8. The reluctancy Kr, which is equal to one, of a conventional PWM square wave brushless direct current motor is changed to range from 0.7 to 0.8, the motor is easily controlled in a field weakening control mode, the d axis and the q axis of the motor are coincident with the N axis and the S axis of a coordinate system, right angles are formed at any time when the magnetic lines are cut by a coil winding, the output torque is maximum, Hall starting is truly avoided, and the starting noise of the motor is reduced. It is thus clear that the motor for the electromobile can be controlled in a field weakening mode, the torque of the motor is maximum, and the noise of the motor is small.

The invention discloses a soybean milk machine and a soft start control system and method of a stirring motor thereof. The soft start control system comprises a power supply unit, wherein the power supply unit is connected with the stirring motor, and the power supply unit is used for supplying power to the stirring motor; and a control unit, wherein the control unit calls a start program when controlling the stirring motor to start, and controls the power supply unit to periodically supply power to the stirring motor in a preset control time sequence at the stirring mark position of the startprogram to enable rotation speed of the stirring motor to be in a rising trend till reaching a preset rated speed. The system controls the power supply unit to periodically supply power to the stirring motor when the stirring motor starts to enable the stirring motor to realize soft start, thereby prolonging the service life of the stirring motor and reducing start noise of the stirring motor; and besides, the stirring motor can meet EMC requirements without using a filter device with high specification parameters, thereby reducing design cost and difficulty.