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

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 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 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.