30results about How to "Intelligent speed control" patented technology

The invention discloses a cooling fan drive circuit and a cooking utensil. The cooling fan drive circuit comprises a current sampling circuit, a signal amplification circuit and a drive circuit body which are connected in sequence. The current sampling circuit is used for detecting real-time currents of a heating device in the heating process. The signal amplification circuit is used for conducting signal amplification on the real-time currents detected by the current sampling circuit. The drive circuit body is used for controlling the rotating speed of a cooling fan according to current signals output by the signal amplification circuit. According to the cooling fan drive circuit and the cooking utensil, the fan can be driven with the help of the current sampling signals, the number of temperature wrap sampling circuits can be decreased, MUC resource consumption is reduced, power dissipation is also reduced, and meanwhile the rotating speed of the fan can be adjusted.

The invention relates to a local ending point-based numerical control system speed controlling method, which comprises the steps of drawing a maximum speed curve by obtaining theoretical maximum speeds of all small line sections through computing, selecting a local ending point accordingly, sectioning the processing path by the local ending point, and performing a speed increasing or reducing plan on the sectioned path unit by a system. The method disclosed by the invention plans related continuous multiple sections of small line sections instead of a single small line section every time, thus avoiding frequent speed increasing and reducing, preventing easy generating of relatively large vibrating of a lathe and improving the machining efficiency; and after the method is used for planning the speed, speed increasing and reducing profiles can be sectional or a certain table instead of being analytic functions, and symmetrical speed increasing and reducing processes are not needed.

The invention provides a variable-frequency refrigerator and a control method thereof. The variable-frequency refrigerator comprises a box body and a door body, a chamber is arranged in the box body,a first temperature sensor is used for detecting the ambient temperature; a second temperature sensor is used for detecting the actual temperature of the chamber; a humidity sensor is used for detecting the ambient humidity; and the first temperature sensor, the second temperature sensor, the humidity sensor and the compressor are correspondingly connected with a compressor and a control panel; the refrigerator is in a normal operation state, the control panel is used for acquiring the temperature difference between the actual temperature of the chamber and the preset temperature of the chamber, and the control panel controls the rotating speed of the compressor according to the ambient temperature, the ambient humidity and the temperature difference value.

The invention relates to a speed control method for a numerical control system in consideration of small line segment and connection point speed. A maximum speed curve is drawn by obtaining theoretical maximum speed of all small line segments and connection points through calculation, local end points are selected accordingly, a machining path is segmented through the local end points and the system makes acceleration or deceleration speed plans for path units obtained after segmentation. The line segments planned at each time by adopting the method provided by the invention are no longer separate small line segments but relevant continuous multiple small line segments. Therefore, frequent acceleration does not occur, a machine is not easy to generate greater vibration and the machining efficiency is improved; by adopting the method to plan the speed, acceleration and deceleration outlines are not required to be an analytic function and can be segmented or certain tables; and acceleration and deceleration processes are not required to be symmetrical.

The invention discloses a direct-current brushless electro-hydraulic power steering pump and a control method thereof of a new energy passenger car. The technical problem of too high temperature of oil liquid of existing steering pumps is solved. The direct-current brushless electro-hydraulic power steering pump of the new energy passenger car comprises a steering pump assembly, a direct-current brushless motor and a steering controller. An output shaft of the direct-current brushless motor is connected with a pump shaft of the steering pump assembly through an insulation transmission device. The insulation transmission device comprises a transmission connection block and a connection block insulation sleeve which are connected to the pump shaft in a sleeving mode sequentially from inside to outside and connected into a whole. The transmission connection block and the pump shaft transmit torque fixedly in the radial direction, and the connection block insulation sleeve and the output shaft of a steering motor assembly transmit torque fixedly in the radial direction. A heat dissipation cover with an opening is disposed on the steering pump assembly, the steering controller is connected with an angle sensor which detects the rotation angle of a passenger car steering wheel, and the steering controller controls the rotation speed of the steering motor assembly in a closed-loop mode according to an angle signal.