45results about How to "Estimates are accurate and reliable" patented technology

The invention discloses an online lithium ion battery SOC estimation method based on extended Kalman filter, belongs to the technical field of SOC prediction of a lithium ion battery, and aims to solve the problem that the reliability of the online estimation of a conventional lithium ion battery SOC is low due to influence of initial value selection. The method comprises the steps as follows: a voltage and current relation of a first-order RC (resistance/capacitance) equivalent circuit of a detected lithium ion battery and a voltage and current relation of a second-order RC equivalent circuit are established firstly; a charge-discharge experiment is performed on the detected lithium ion battery to establish a polynomial fitting function of a Kalman filter initial value SOC 0 of the detected lithium ion battery; a covariance P (0) of the Kalman filter initial value SOC 0 and a Kalman filter initial error of the detected lithium ion battery is obtained; and then, battery SOC estimation based on extended Kalman filter is performed, so that the online estimation of the lithium ion battery SOC is realized. The method is used for online estimation of the lithium ion battery SOC.

The invention provides a detection method of indomethacin. The detection method comprises the following steps: producing and providing indomethacin tablets with different mass gradients; under the same pre-set condition, obtaining characteristic absorption peaks of the indomethacin tablets to terahertz wave radiation under the different mass gradients; radiating a sample to be detected by adoptingterahertz waves and obtaining the characteristic absorption peak of the sample to be detected to the terahertz wave radiation; judging whether the characteristic absorption peak of the sample to be detected to the terahertz wave radiation and the characteristic absorption peaks of the indomethacin tablets to the terahertz wave radiation under the different mass gradients are similar or not underpre-set conditions; if so, judging that the sample to be detected contains the indomethacin. According to the detection method provided by the invention, a manner of radiating the indomethacin tabletsby utilizing terahertz waves is utilized so that the problems of a traditional method of sample damages, high danger and high cost are overcome; the sample is produced by adopting a tabletting methodso that the speed is more rapid when a terahertz detection technology is used for detecting in the future and an obtained result is more accurate and reliable.

A wireless power transmitter (101) comprises a driver (201) generating a drive signal for a transmitter coil (103) thereby generating a power transfer signal during power transfer intervals of a repeating time frame comprising at least one power transfer interval and one foreign object detection interval. A test generator (211) generates a test drive signal for a test coil (209) thereby generating an electromagnetic test signal during foreign object 5 detection intervals. A foreign object detector (207) performs a foreign object detection test in response to a measured parameter for the test drive signal during the foreign object detection intervals. An adapter (213) generates a varying test drive signal for the test coil (209) during an adaptation interval, and determines a test drive signal parameter value in response to the varying test drive signal. The test generator (211) sets a signal property of the test drive 10 signal during at least one foreign object detection interval in response to the test drive signal parameter value.

Method and system for monitoring stress level of a subject. Beat-to-beat time variation and stroke volume variation of the heart a subject are obtained simultaneously, and a stress level indication is determined as a function of the beat-to-beat time variation and the relative stroke volume variation. More accurate and reliable estimates for stress level may be obtained.

A method and a device for estimating the instantaneous mass of a rotary wing aircraft, the aircraft having a power plant driving at least one main rotor and an anti-torque rotor in rotation, and also having a plurality of sensors. The method uses functional characteristics and flight characteristics of the aircraft, atmospheric characteristics, and performance curves for the aircraft to determine the measured instantaneous mass M_m of the aircraft. Furthermore, the method makes it possible to consolidate the measured instantaneous mass M_m of the aircraft by comparing it in arithmetical or statistical manner during a flight of the aircraft with a calculated instantaneous mass M_c determined from the variation in the quantity of fuel present in the aircraft.

A method and a device for estimating on an aircraft at least one wind characteristic.

The device (1) comprises means (7) for determining a corrective term being representative of an apparent wind created upon a rotation of the aircraft and means (4) for determining the wind characteristic taking into account such a corrective term.

The invention discloses a bared oil-gas pipeline minimum pipe wall temperature measuring method. The measuring method comprises the following steps: the first step in which the total heat transfer coefficient K by taking the area of the outer surface of the pipeline as the reference is calculated; the second step in which the medium temperature t2 at the tail end of the pipeline is calculated, the environment temperature te of the region at which the tail end of the pipeline is located is measured, and the environment temperature te of the region at which the tail end of the pipeline is located is subtracted from the medium temperature t2 at the tail end of the pipeline to obtain the temperature difference delta t at the tail end of the pipeline; and the third step in which the minimum wall temperature tmin at the tail end of the pipeline is calculated through the formula described in the description. According to the technical scheme of the invention, six principal factors influencing the bared steel tube minimum wall temperature in the low-temperature environment, including the environment temperature, the medium temperature, the environment wind speed, the conveying flow, the pipeline specification and the pipeline length are taken into account comprehensively, the estimation result of the minimum wall temperature is accurate and reliable, less difference exists between the estimation result and the wall temperature that measured practically, the accuracy of the method is higher than the accuracy of other engineering estimation methods, the accuracy of the method is equivalent to the accuracy of the numerical calculation method, and the method is simpler and more convenient than the numerical calculation method.

In order to realize a true and natural color mapping result, the invention provides a color mapping method which comprises a step of obtaining the brightness value of each pixel of a first area and a second area according to a preset brightness calculation mode, a step of sorting the pixels of the first area according to the brightness value of each pixel of the first area to obtain a first sequence and sorting the pixels of the second area according to the brightness value of each pixel of the second area to obtain a second sequence, a step of obtaining the position data Ii of a pixel I of the second area in the second sequence, using Ii to read a corresponding pixel i' in the first sequence and mapping the color value of the corresponding pixel i' to the pixel i. The invention also provides a device for realizing the method, the mapping actual effect generated by the scheme is equivalent of the effect of maintaining a constant light condition, the color of a target area is mapped to a source area on the above basis, an obtained result is real and natural, and an estimated effect which is in accordance with the reality can be obtained.

The invention belongs to the technical field of new energy automobiles, and particularly relates to an SOC estimation method of a dynamic correction ampere-hour integral method. Calculating the current battery SOC through an ampere-hour integral method, substituting the value into a battery second-order RC equivalent model to calculate the current battery end voltage (U estimation), carrying out difference calculation on the current battery end voltage (U real) and a real sampling end voltage value (U real), and if the difference is greater than a voltage sampling error (zeta u error), continuously correcting the sampling current value to correct the SOC value; otherwise, directly outputting the SOC value; compared with a traditional ampere-hour integral method for estimating the SOC, the method considers factors such as current sampling precision, battery internal resistance, temperature and aging, and SOC estimation is more accurate and reliable.

A method for estimation of a vehicle tire force includes: receiving, by a controller of a vehicle, a measured vehicle acceleration of the vehicle; receiving, by the controller, a measured wheel speed and a measured yaw rate of the vehicle; forming, by the controller, inertia matrices based on an inertia of rotating components of the vehicle; calculating torques at corners of the vehicle using the inertia matrices; estimating tire forces of the vehicle based on the measured vehicle acceleration, the measured wheel speed, and the inertia matrices; and controlling, by the controller, the vehicle, based on the plurality of estimated longitudinal and lateral tire forces.