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601 results about "Benchmark data" patented technology

Benchmark data. Information collected from industry sources to determine how other firms (especially the best in class ones) achieve their high levels of performance.

Method for detecting refrigerant leakage of air conditioning system and air conditioning system

The invention discloses a method for detecting refrigerant leakage of an air conditioning system and the air conditioning system. The method comprises the steps of: S10, collecting the state parameters of the air conditioning system when the external environment temperature is T in an operating process of the air conditioning system and storing the collected data at the temperature for the first time as reference data; S20, in the operating process of the air conditioning system, when the external environment temperature reaches T again, collecting the state parameters of the air conditioning system again; S30, comparing the collected data with the reference data and calculating deviation therebetween; and S40, when the deviation exceeds a predetermined value, judging the condition of refrigerant leakage. When the method disclosed by the invention is used for detecting refrigerant leakage, the detection result is not affected by an actual installing condition; the influence on the environment temperature can be eliminated, so that the extent of refrigerant deficiency in the air conditioning system can be accurately judged, and the detection result is more reliable. The invention further discloses the air conditioning system.
Owner:GREE ELECTRIC APPLIANCES INC OF ZHUHAI

Method for improving accuracy of geomagnetic parking stall detector

The invention discloses a method for improving accuracy of a geomagnetic parking stall detector. The method includes: by collecting sample data of a background magnetic field, calculating and recording benchmark data of the background magnetic field as reference standards; respectively determining calculated weight values in three axial directions according to stability of the sample data, collected by a triaxial magnetoresistive sensor, of the background magnetic field in three axial directions; turning off a wireless communication module when reading data of the triaxial magnetoresistive sensor, and storing the data into a buffer queue; calculating magnetic field changes for the data in the buffer queue, performing median filtering, and performing parking stall state determination according to changes of the magnetic field data; calibrating the benchmark data of the background magnetic field under the condition of free parking stalls; uploading the parking stall information and battery level information through the wireless communication module prior to entering the sleep state; waking through an RTC (real-time clock) in a timed manner, continuing executing from the step 3, and so on. Compared with the prior art, the method has the advantages that influence caused by temperature drift compensation and time drift of the sensor on parking stall determination accuracy can be restrained effectively, and the method is higher in adaptability, lower in cost and the like.
Owner:JIANGSU PROVINCIAL COMM PLANNING & DESIGN INST

Automatic registration method of aviation and ground LiDAR data based on building contour constraint

Disclosed is an automatic registration method of aviation and ground LiDAR data based on building contour constraint. The method includes firstly extracting building contours or aviation contours and ground contours for short from aviation and ground LiDAR data; extracting building angular points or aviation angular points and ground angular points for short from the aviation contours and the ground contours; taking the matching degree between the aviation contours and the ground contours as constraint, calculating initial transfer matrixes between the aviation angular points and the ground angular points, and obtaining initial matching angle dot pairs; finally, calculating correction transfer matrixes between the initial matching angle dot pairs by using an iterative closest point (ICP) algorithm, and converting ground dot cloud data to be matched through the initial transfer matrixes and the correction transfer matrixes successively to achieve automatic high-precision registration of the aviation and ground LiDAR data. The method has great advantages in registration reliability and accuracy with contour lines serving as constraint; and simultaneously, based on LiDAR data to be matched and reference LiDAR data, accuracy registration between the aviation and ground LiDAR data can be achieved without other auxiliary data.
Owner:NANJING UNIV

Self-learning automatic noise reduction system and method of kitchen ventilator

The invention discloses a self-learning automatic noise reduction system and method of a kitchen ventilator. The system mainly comprises a flue gas turbine, a microphone and a loudspeaker are arranged on the flue gas turbine, after the flue gas turbine is assembled, and before the turbine leaves the factory, the turbine is subject to primary pre-alignment, and the pre-alignment data serve as following field actual running preset benchmark data, and after the flue gas turbine is mounted at the user home, the flue gas turbine runs at the different rotating speeds; flue gas turbine noise and environment noise at different rotating speed segments are collected through the microphone, collected measured data are fed back to a signal processing module on the glue gas turbine, and a self-learning noise reduction algorithm module is combined with the measured data of the flue gas turbine noise and the environment noise to generate a corresponding sound waveform according to the benchmark data preset in a pre-alignment module; the sound waveform is output through the loudspeaker and is used for offsetting most part of noise. The system has the beneficial effects that the main noise component can be effectively removed, a certain obvious effect is achieved, a corresponding sound field and a complex algorithm do not need to be built, and meanwhile, expensive hardware circuit supporting does not need to be built.
Owner:HANGZHOU ROBAM APPLIANCES CO LTD
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