122results about How to "Improve position detection accuracy" patented technology

A vehicle navigation apparatus is capable of detecting a current vehicle position with improved accuracy. The reliability factor of a distance coefficient is reduced when a vehicle runs in an area having a large altitude gradient or when a position detection error is detected between a current vehicle position calculated using the distance coefficient and a current vehicle position calculated based on GPS position data. When the vehicle runs at a high speed, the distance coefficient is modified depending on the running speed. After the distance coefficient is determined via learning, if a position detection error is detected for a road which the vehicle has previously traveled, a position detection cost is assigned to the road. Factors that can cause a position detection error are minimized, thereby making it possible to detect a current vehicle position with high accuracy.

Improvement of the image quality and position detection accuracy is implemented. Operation of a backlight 300 to emit illuminating light from one face side of a liquid crystal panel 200 to a display region PA of the liquid crystal panel 200 is controlled based on reception light data obtained by an external light sensor element 32b. Here, the operation of the backlight 300 is controlled based on the reception light data obtained by the external light sensor element 32b disposed in the display region PA.

In the image blur correcting unit, one end of a flexible board is connected to a sensor board included in a holding module, and the portion of the flexible board that extends at least first from the sensor board extends outwardly from the holding module in a direction oblique to both first and second directions. That is, the flexible board is extended from the vicinity of an axis point which swings least while the holding module is swinging.

A toothbrush handle for providing oral cavity position detection during operation includes a handle body having a longitudinal axis, a receiver body elastically deformable relative to the longitudinal axis, and a three-axis force sensor that is operatively connected to the base portion and configured to obtain three-axis force data for oral cavity position detection during operation.

An induction heating cooker includes a plurality of heating coil blocks including one or more heating coils, a plurality of inverters to supply a high-frequency voltage to each of the heating coils, and a controller to control operations of the plurality of inverters to alternately supply the high-frequency voltage to each heating coil block and detect a heating coil, on which a container is placed, from among the heating coils belonging to each of the plurality of heating coil blocks. Using this configuration, it is possible to reduce the influence of magnetic field interference between adjacent heating coils when detecting the position of the container and to increase container position detection accuracy.

The invention discloses a PMSM rotor position detection device and method based on an improved sliding-mode observer. A second-order generalized integration method is employed instead of a low pass filter to process a counterelectromotive force signal; an equivalent counterelectromotive force signal is observed through the improved sliding-mode observer based on a sigmoid function, buffeting of equivalent counterelectromotive force is inhibited through the second-order generalized integration method, phase lag caused by the low pass filter is avoided, a normalized quadrature phase locked loop is employed to estimate a rotor position signal according to the estimation counterelectromotive force signal, and the inhibition effect on each harmonic contained in the counterelectromotive force signal can be realized through resonance of the improved sliding-mode observer at the fundamental frequency. The method is advantaged in that the structure of the improved sliding-mode observer is simple, the observed counterelectromotive force signal is relatively accurate, and the high-precision rotor position information can be acquired.

To provide an inertial drive actuator that is easy to assemble and achieves high accuracy in position detection, the actuator has a fixed member, a vibration substrate, a piezoelectric element (movement unit), first and second moving bodies that moves relative to the vibration substrate by inertia, a first electrode provided on the surface of each of the first and second moving bodies, a second electrode provided on a surface of the vibration substrate, an insulating film provided between the first electrode and the second electrode, a drive unit, and a position detection unit that detects the position of the moving body with respect to the vibration substrate based on capacitance of the portion in which the first electrode and the second electrode are opposed to each other.

Provided are a gamma ray detector and a gamma ray reconstruction method which can be used in SPECT and PET and which combine and reconstruct the information on “Compton-scattered” gamma rays, thereby remarkably increasing gamma ray detection sensitivity, decreasing the amount of a radioactive substance given to a subject, and remarkably reducing the concern about the amount of radiation exposure. The gamma ray detector comprises an absorber scintillator 12 made from an absorptive substance exhibiting a high rate of absorption with respect to gamma rays 1 in an energy region, emitted from a subject, a Compton scattering scintillator 14 made from a Compton scattering substance exhibiting a high probability of Compton scattering, and an energy detector 16 which combines the amounts of gamma ray energy absorption simultaneously measured by the two types of scintillators to reconstruct the gamma rays emitted from the subject. The two types of scintillators 12 and 14 are arranged in multiple layers so as to absorb or Compton-scatter the whole energy of the gamma rays 1.

A resolver detected position compensation system for a resolver is provided that can enhance a position detection precision by performing a further compensation on a compensated position that was obtained from a static error compensation. The position detection circuit 5 outputs a compensated detected position signal in which a static error has been compensated. The differential circuit 11 differentiates the compensated detected position signal to obtain a rotational speed of the resolver. Based on a signal representing the rotational speed output from the differential circuit 11, the phase data memory means 15 and the peak value memory means 17 send the variation in phase and the amplitude peak value, respectively, of the dynamic error signal to the multiplication means 19. The multiplication means 19 calculates an estimated dynamic error and the subtraction circuit 21 removes the estimated dynamic error from the compensated detected position signal.

A position detection apparatus and a medical-device-position detection system that have improved position detection accuracy are provided by setting high amplification for the position detection apparatus. The position detection apparatus includes a circuit that has at least one embedded coil (10a) and that is provided inside an object (10) to be detected; a first magnetic-field generating unit (11) for generating a first magnetic field in the region where the embedded coil (10a) is disposed; a magnetic-field detecting unit (5, 12) for detecting an induced magnetic field generated at the embedded coil (10a) by the first magnetic field; and a second magnetic-field generating unit (23) for generating a second magnetic field having a phase substantially opposite to the phase of the first magnetic field.

The invention relates to a sensorless initial position detecting method for a permanent magnet synchronous motor. The sensorless initial position detecting method comprises the steps of: adopting a virtual pulsating high-frequency injection method for calculating a rotor position, injecting a high-frequency voltage into a virtual direct axis, establishing a virtual rotating coordinate system, utilizing the virtual rotating coordinate system and a mathematical model of a permanent magnet synchronous motor coordinate system to calculate straight-axis and quadrature-axis currents, multiplying a straight-axis current signal and a quadrature-axis current signal by a voltage frequency containing an injection signal and a cosine value of an assumed rotational frequency simultaneously and separately, subjecting the results to low-pass filtering, and deriving out arc tangent of the two currents after filtering to obtain the rotor position preliminarily; and utilizing a sine and cosine relationship between the straight-axis and quadrature-axis currents to further obtain the rotor position, adopting a carrier frequency component method to replace a secondary injection method for conducting magnetic pole judgment, and correcting N-S poles to obtain the actual rotor position. The sensorless initial position detecting method has the advantages of high precision and simple implementation, and can be used for improving the sensorless starting control precision of the permanent magnet synchronous motor used for fans, pumps, compressors or electric vehicles.

There is provided an input device including: means for performing zero point correction on the sensor outputs of the load sensors when an absolute value of an amount of output change of each load sensor is not more than a predetermined threshold a during a certain period of measurement time; means for calculating position data and calculating a total load Z of the load sensors by using the sensor outputs; means for determining that the calculation data pieces are normal when the absolute value |dZ/dt| of the amount of change in the total load Z is not more than the threshold β; means for determining that an input is present in the calculation data pieces when the absolute value |Z| of the total load is not less than the threshold γ; and means for removing a predetermined number of first and last data pieces in the calculation data pieces.

Provided herein are embodiments of a home automation system. The home automation system includes display means configured to display a view of at least one part of a floor plan of a spatial environment of the home automation system. An intuitive and simplified set-up takes place by the programming means being configured to program at least one action of an actuator of the home automation system based on the currently displayed view of the floor plan and a function of the actuator and/or a sensor of the home automation system.

The invention discloses a liquid control reversing buffer device and method. The device includes position detection device which used in detecting piston moving location of liquid control reversing system and produce position signal. Controller is used in receiving position signal and accord to the signal to regulate oil pump displacement of liquid control reversing system, and then realize the buffer to piston reversing. The device can direct measure position of piston, then improve signal detection precision and dynamic responsiveness, and make liquid control reversing system stable.

The invention relates to techniques for sensing of touch events near to a surface using position data from a pair of two-dimensional sensors (a camera and a quadrature detector). We describe apparatus for detecting the location of one or more objects on, or adjacent to, a surface, the apparatus comprising: an illuminator generating a generally planar fan of light above said surface; a pair of two-dimensional sensors, positioned above said surface comprising a camera, and a quadrature detector; and processing circuitry for receiving output from said sensors, and returning an estimate of said object location

The invention discloses a method and device for detecting the position of a suspended substance in a magnetic suspension device. In the method, a sensor group is arranged in each controllable horizontal moving direction of the suspended substance, and comprises two sensors arranged symmetrically relative to the center of the suspension device, wherein each sensor is correspondingly used for detecting electromagnetic field intensity and suspended substance field intensity for controlling the horizontal moving direction of the suspended substance; and the position of the suspended substance is obtained by judging according to an offset difference value obtained by subtracting the detection values of the two sensors in the same group. The device comprises sensor groups which correspond to the quantity of controllable horizontal directions of the suspended substance in the suspension device and a processing unit, wherein each sensor group comprises two sensors which are arranged along the same horizontal direction and are arranged symmetrically relative to the center of the suspension device. The device has the advantages of simple and compact structure, low cost, stable and reliable work, capability of eliminating the influence of an external superposed magnetic field, increasing the detection accuracy and control accuracy, and the like.

The invention provides a method for improving the leaf position detection accuracy of a multi-leaf collimator. The method sequentially comprises the following steps that (a), the phase A of an incremental encoder is connected with an external interrupt interface of a single-chip microcomputer, and the phase B of the incremental encoder is connected with an I/O interface of the single-chip microcomputer; (b), when an interrupt happens, the single-chip microcomputer judges that the phase A is located on the rising edge or the falling edge when in the interrupt position and detects that a signal of the phase B is in high level or in low level at the moment; (c), if the phase A is located on the rising edge and the phase B is in low level, the single-chip microcomputer judges the forward rotation and one is added to the number of a counter; if the phase A is located on the rising edge and the phase B is in high level, the micro-chip microcomputer judges backward rotation and one is subtracted from the number of the counter; if the phase A is located on the falling edge and the phase B is in high level, the micro-chip microcomputer judges forward rotation and one is added to the number of the counter; if the phase A is located on the falling edge and the phase B is in low level, the micro-chip microcomputer judges backward rotation and one is subtracted from the number of the counter. Accumulated errors of the incremental encoder are effectively avoided in the frequent forward rotation and backward rotation process of a motor, and the leaf position detection accuracy of the multi-leaf collimator is improved.