Temperature Compensator Patents (Class 73/497)
  • Patent number: 10868963
    Abstract: Various embodiments of the present technology may provide a method and apparatus for a processing circuit. The processing circuit may include an amplifier and other processing circuitry that operate together to process and/or adjust a gyro signal. The processing circuit may include an integration circuit configured to compute a first value and adjust the first value to a predetermined maximum value if the first value is greater than the predetermined maximum value. The processing circuit may also include a gain control circuit configured to compute a first coefficient based on the first value; select one of: the first coefficient and a second coefficient; and adjust a gain of the amplifier according to the selected coefficient.
    Type: Grant
    Filed: March 14, 2019
    Date of Patent: December 15, 2020
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Yukihiko Shigeoka
  • Patent number: 10859593
    Abstract: A magnetic circuit assembly for an accelerometer includes an excitation ring that includes a base portion defining oppositely facing first and second sides, a ring portion extending from the second side of the base portion to define a ring recess, a first metallic inlay recessed into the first side of the base portion in which the first metallic inlay includes a material different than that of the base portion, a second metallic inlay recessed into the second side of the base portion in which the second metallic inlay includes a material different than that of the base portion, and a magnet received within the ring recess and attached to the second metallic inlay.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: December 8, 2020
    Assignee: Honeywell International Inc.
    Inventors: Paul W. Dwyer, John Strehlow
  • Patent number: 10642204
    Abstract: An image forming apparatus that forms an image on a sheet includes: a rotating body that forms the image; a motor that rotationally drives the rotating body; a current measurer that measures a motor current flowing through a current supply path including a winding of the motor at a measurement timing that is a timing after the motor is started; a torque acquisitor that acquires a torque value of the motor, based on a measured value of the motor current; and a corrector that performs correction to cancel a current change amount based on a characteristic change depending on a temperature state of the motor at the measurement timing, in acquisition of the torque value by the torque acquisitor.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: May 5, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Katsuhide Sakai, Yasuhiro Ishihara, Satoshi Chikazawa
  • Patent number: 10429409
    Abstract: Systems and methods are provided for calibrating and regulating the temperature of a sensor. One or more temperature adjusting devices can be provided to regulate the temperature of the sensor. One or more of the temperature adjusting devices can be provided to perform a calibration to determine a relationship between sensor bias and sensor temperature. The one or more temperature adjusting devices can be built into the sensor.
    Type: Grant
    Filed: March 14, 2017
    Date of Patent: October 1, 2019
    Assignee: SZ DJI TECHNOLOGY CO., LTD.
    Inventors: Guoxiu Pan, Renli Shi
  • Patent number: 10359285
    Abstract: An angular velocity sensor including a vibration body having a sensor electrode, a driving electrode, and a monitor electrode. The monitor electrode generates a signal according to vibration of the vibration body. The sensor circuit outputs a signal representing an angular velocity applied to the vibration body. The amplitude determination circuit measures amplitude of vibration of the vibration body. A PLL circuit includes a constant voltage source for generating a constant voltage, a timing switching unit for outputting a voltage by switching selectively between the constant voltage and a voltage corresponding to the monitor signal, and a voltage-controlled oscillator for outputting an oscillation signal having a frequency corresponding to the voltage output from the timing switching unit. When the amplitude measured is smaller than a predetermined value, the timing switching unit outputs the constant voltage output from the constant voltage source and outputs a start-up mode signal.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: July 23, 2019
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hideyuki Murakami, Takashi Kawai, Masaki Nakamura
  • Patent number: 10345329
    Abstract: An inertial force sensor includes: an acceleration detection element; a temperature sensor that detects an ambient temperature of the acceleration detection element; a bridge circuit that processes an output signal from the acceleration detection element; an AD converter that converts an analog signal output from the bridge circuit into a digital signal, and outputs the digital signal; a calculation circuit that performs calculation on the output signal from the AD converter; and a storage that stores correction data for correcting a variation in the output signal from the AD converter due to a temperature change. The correction data are coefficients of a formula expressed by a calibration curve that is a quadratic or higher-degree curve, and the storage stores, as the correction data, the coefficients of the calibration curve of each of a plurality of patterns that differ between a predetermined temperature or more and less than the predetermined temperature.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: July 9, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hirotsugu Suzuki, Yoichi Nakayoshi, Masaki Nakamura
  • Patent number: 10317211
    Abstract: In one embodiment, a sensor includes a rigid wafer outer body. A first cavity is located within the rigid wafer outer body, and a first vibration isolating spring is supported by the rigid wafer outer body and extends into the first cavity. A second vibration isolating spring is supported by the rigid wafer outer body and extends into the first cavity, and a first sensor packaging is supported by the first vibration isolating spring and the second vibration isolating spring within the first cavity.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: June 11, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Bongsang Kim, Ando Feyh, Andrew Graham, Gary O'Brien, Michael Baus, Ralf Maier, Mariusz Koc
  • Patent number: 10302431
    Abstract: A physical quantity detection circuit includes: a synchronous detection circuit that performs a synchronous detection process on a detection target signal based on a detection signal, the detection target signal including a physical quantity detection signal and a leakage signal from a physical quantity detection element, the physical quantity detection element vibrating based on a drive signal to generate the physical quantity detection signal corresponding to a magnitude of a physical quantity, and the leakage signal of vibrations based on the drive signal; and a phase shift circuit that switches a phase difference between the detection signal and the detection target signal, between a first phase difference and a second phase difference that differs from the first phase difference, so that at least part of the leakage signal is output through the synchronous detection process.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: May 28, 2019
    Assignees: SEIKO EPSON CORPORATION, DENSO CORPORATION
    Inventors: Takashi Aoyama, Naoki Yoshida
  • Patent number: 10126189
    Abstract: A resonant sensor includes a proof body having a first and a second interface that can each come into contact with an external mechanical structure; two sensitive zones arranged between these two interfaces; a sensitive zone formed by a plate embedded in a frame secured mechanically to the interfaces, the plate able to resonate under the effect of local mechanical excitations produced at particular points by excitation transducers bearing the plate at several resonant frequencies, sensors picking up the resonant signals produced at the particular points, measurement means measuring the resonant frequency shifts of signals which are linear combinations of the resonant signals picked up, the shifts being a function of mechanical stresses induced by the forces and transmitted to the plate by the frame, the components of the torque of forces being determined from the resonant frequency shifts measured on the plates of the sensitive zones.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: November 13, 2018
    Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
    Inventors: Davinson Castano Cano, Mathieu Grossard, Arnaud Hubert
  • Patent number: 10067153
    Abstract: A semiconductor device according to the present invention includes plural temperature sensors; a switching circuit that switches between detection signals from the temperature sensors at a predetermined frequency; an ADC that receives the output of the switching circuit and outputs a converted signal; a correction information extracting circuit that generates a temperature mean value; and an abnormality information extracting circuit that generates a temperature difference value.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: September 4, 2018
    Assignee: Renesas Electronics Corporation
    Inventor: Nobufumi Kasuya
  • Patent number: 9574953
    Abstract: The present invention provides a magnetic force sensor that can precisely detect and correct variations in a magnetic field generated by a magnetic flux generating source. Therefore, a displacement magneto-electric transducer, which detects a change in the magnetic field caused by an external force, and a fixed magneto-electric transducer, where the change in the magnetic field caused by the external force does not occur, are provided to face end sides of magnetic poles of the magnetic flux generating source. The fixed magneto-electric transducer detects a variation of the magnetic field caused by, for example, changes with time and environmental variations such as a temperature rise in the interior of the sensor. On the basis of a detection amount thereof, an operational section performs a correction operation, so that a sensitivity coefficient or an offset of the displacement magneto-electric transducer is corrected.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: February 21, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shuuichi Sato
  • Patent number: 9238576
    Abstract: A MEMS apparatus comprising composite vibrating unit and the manufacturing method thereof are disclosed. The vibrating unit includes a stiffness element on which a first material is disposed. A second material being a conductive material is disposed on the first material and is extended to the stiffness element to remove electric charge on first material. When a temperature is changed, a variation direction of a Young's modulus of the first material is opposite to a variation direction of a Young's modulus of the stiffness element. The unique attributes above allow vibrating unit of the MEMS apparatus such as resonator and gyroscope to have stable resonance frequency against the change of temperature.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: January 19, 2016
    Assignee: Industrial Technology Research Institute
    Inventors: Chung-Yuan Su, Chao-Ta Huang, Tzung-Ching Lee, Yu-Wen Hsu
  • Patent number: 9038459
    Abstract: A precision gyroscope includes a gyroscope, means for receiving an external clock reference, and circuitry coupled to the means for receiving the external clock reference and adapted for stabilizing a temperature and a frequency of the gyroscope.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: May 26, 2015
    Assignee: HRL Laboratories, LLC
    Inventor: Randall L. Kubena
  • Publication number: 20150040662
    Abstract: An apparatus for detecting rotational speed includes a lead wire having a signal line covered with a sheath layer and a rotational speed detector connected to the lead wire and outputting an electrical signal corresponding to an object rotation. The apparatus for detecting rotational speed further includes a housing having the rotational speed detector inside and a resin stay integrally holding the housing and the lead wire. The resin stay includes at least one hole formed thereon.
    Type: Application
    Filed: July 9, 2014
    Publication date: February 12, 2015
    Inventor: Mitsuru Takasaki
  • Publication number: 20150033848
    Abstract: An optical sensor having one or more sensing interference elements is disclosed. A first detector function generates a coarse optical path difference signal for example using a discrete Fourier transform of a detected interference spectrum, and a second detector function generates a refined optical path difference signal using the coarse optical path difference signal and for example a cross correlation of the interference spectrum with one or more sets of periodic transfer functions.
    Type: Application
    Filed: March 13, 2013
    Publication date: February 5, 2015
    Applicant: OXSENSIS LTD
    Inventor: Ralf-Dieter Pechstedt
  • Patent number: 8733170
    Abstract: A micro-electromechanical device includes a semiconductor substrate, in which a first microstructure and a second microstructure of reference are integrated. The first microstructure and the second microstructure are arranged in the substrate so as to undergo equal strains as a result of thermal expansions of the substrate. Furthermore, the first microstructure is provided with movable parts and fixed parts with respect to the substrate, while the second microstructure has a shape that is substantially symmetrical to the first microstructure but is fixed with respect to the substrate. By subtracting the changes in electrical characteristics of the second microstructure from those of the first, variations in electrical characteristics of the first microstructure caused by changes in thermal expansion or contraction can be compensated for.
    Type: Grant
    Filed: January 7, 2010
    Date of Patent: May 27, 2014
    Assignee: STMicroelectronics S.r.l.
    Inventors: Ernesto Lasalandra, Angelo Merassi, Sarah Zerbini
  • Patent number: 8701487
    Abstract: An angular velocity detection apparatus includes a vibrator that generates a signal that includes an angular velocity component and a vibration leakage component, a driver section that generates the drive signal, and supplies the drive signal to the vibrator, an angular velocity signal generation section that extracts the angular velocity component from the signal generated by the vibrator, and generates an angular velocity signal corresponding to the magnitude of the angular velocity component, a vibration leakage signal generation section that extracts the vibration leakage component from the signal generated by the vibrator, and generates a vibration leakage signal corresponding to the magnitude of the vibration leakage component, and an adder-subtractor section that adds the vibration leakage signal to the angular velocity signal, or subtracts the vibration leakage signal from the angular velocity signal, in a given ratio to correct temperature characteristics of the angular velocity signal.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: April 22, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Hideto Naruse, Kenji Sato, Yutaka Takada
  • Patent number: 8677822
    Abstract: An angular velocity detection circuit is connected to a resonator for making excited vibration on the basis of a drive signal and detects an angular velocity. The angular velocity detection circuit includes: a self-vibration component extraction unit that receives, from the resonator, a detection signal including an angular velocity component based on a Coriolis force and a self-vibration component based on the excited vibration and extracts the self-vibration component from the detection signal; a direct-current conversion unit including an integration unit that integrates an output signal of the self-vibration component extraction unit; and a temperature characteristic compensation unit that compensates for a variation due to a temperature in an output signal of the direct-current conversion unit.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: March 25, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Kenji Sato
  • Patent number: 8671755
    Abstract: An angular velocity detection circuit is connected to a resonator for making excited vibration on the basis of a drive signal and detects an angular velocity. The angular velocity detection circuit includes: a self-vibration component extraction unit that receives, from the resonator, a detection signal including an angular velocity component based on a Coriolis force and a self-vibration component based on the excited vibration of the resonator and extracts the self-vibration component from the detection signal; a direct-current conversion unit including an integration unit that integrates an output signal of the self-vibration component extraction unit; and an offset addition unit that adds an offset value to an output signal of the direct-current conversion unit.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: March 18, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Kenji Sato
  • Patent number: 8577633
    Abstract: A personal mobile device housing contains a display screen, a wireless telephony communications transceiver, and a battery charger interface. A temperature sensor and a gyro sensor whose zero turn rate output contains an offset are also included. A lookup table has gyro zero turn rate offset correction values associated with different temperature values. A programmed processor accesses the lookup table to correct the output of the gyro sensor for zero turn rate offset. It is automatically determined, during in-the-field use, when the device is in a motionless state, and the output of the temperature and gyro sensors are read. The read gyro output is written to the lookup table as part of a pair of associated temperature and zero turn rate offset correction values. Other embodiments are also described and claimed.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: November 5, 2013
    Assignee: Apple Inc.
    Inventor: Parin Patel
  • Patent number: 8558150
    Abstract: A thermally controlled gas bearing supported inertial measurement unit (IMU) system is provided. The system comprises a sensor assembly enclosing one or more sensors and a plurality of heating elements, wherein each of the plurality of heating elements is proximal to the sensor assembly. The system also comprises a plurality of temperature sensors configured to determine a temperature of a region of the sensor assembly and a control unit configured to adjust a temperature of at least one of the plurality of heating elements based on feedback from the at least one temperature sensor.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: October 15, 2013
    Assignee: Honeywell International Inc.
    Inventor: Charles D. Chappell
  • Publication number: 20130239650
    Abstract: A device is described for use in performing an inground operation. An accelerometer is supported by the device for generating accelerometer readings that characterize the inground operation subject to a native temperature drift of the accelerometer. A set of compensation data is developed and stored for use in compensating for the native temperature drift. The compensation data is applied to the accelerometer readings to produce compensated accelerometer readings that externally compensate for the native temperature drift to yield an enhanced thermal performance which is improved as compared to a native thermal performance of the accelerometer. A seven position calibration method for a triaxial accelerometer is described. An air module is described which isolates the accelerometer of the device at least from a potting compound that at least fills otherwise unoccupied volumes of the device interior.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 19, 2013
    Applicant: Merlin Technology Inc.
    Inventors: Albert W. Chau, Benjamin John Medeiros, Jason Pothier, Dmitry Feldman
  • Publication number: 20130130734
    Abstract: A smart sensor circuit board comprises an interface to a wireless smart sensor board platform, a multi-axis accelerometer having a sensitivity that can measure ambient structural vibrations resulting from non-catastrophic routine environmental factors, an analog to digital converter (ADC) for converting signals from the multi-axis accelerometer having a plurality of individual channels including oversampling, filtering, and decimation, and each channel being individually programmable for gain, anti-aliasing, cut-off frequency, sampling, and frequency providing data to the interface, and a low noise and high sensitivity amplifier having the plurality of individual channels to receive signals from the multi-axis accelerometer.
    Type: Application
    Filed: May 24, 2011
    Publication date: May 23, 2013
    Applicant: The Board of Trustees of the University of Illinois
    Inventors: Jennifer Rice, Gul Agha, Billie F. Spencer, JR.
  • Patent number: 8402824
    Abstract: A precision gyroscope includes a semiconductor substrate, a gyroscope integrated on the substrate, and a quartz resonator clock integrated on the substrate. In another embodiment the substrate is a quartz substrate.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: March 26, 2013
    Assignee: HRL Laboratories, LLC
    Inventor: Randall L. Kubena
  • Patent number: 8327526
    Abstract: A micromachined thermal and mechanical isolator for MEMS die that may include two layers, a first layer with an active temperature regulator comprising a built-in heater and temperature sensor and a second layer having mechanical isolation beams supporting the die. The isolator may be inserted between a MEMS die of a disc resonator gyroscope (DRG) chip and the leadless chip carrier (LCC) package to isolate the die from stress and temperature gradients. Thermal and mechanical stress to the DRG can be significantly reduced in addition to mitigating temperature sensitivity of the DRG chip. The small form can drastically reduce cost and power consumption of the MEMS inertial sensor and enable new applications such as smart munitions, compact and integrated space navigation solutions, with significant potential cost savings over the existing inertial systems.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: December 11, 2012
    Assignee: The Boeing Company
    Inventors: Howard H. Ge, A. Dorian Challoner
  • Patent number: 8327704
    Abstract: An angular velocity detection circuit is connected to a resonator for making excited vibration on the basis of a drive signal and detects an angular velocity. The angular velocity detection circuit includes: a self-vibration component extraction unit that receives, from the resonator, a detection signal including an angular velocity component based on a Coriolis force and a self-vibration component based on the excited vibration and extracts the self-vibration component from the detection signal; a direct-current conversion unit including an integration unit that integrates an output signal of the self-vibration component extraction unit; and a temperature characteristic compensation unit that compensates for a variation due to a temperature in an output signal of the direct-current conversion unit.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: December 11, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Kenji Sato
  • Patent number: 8240204
    Abstract: A synchronous detection circuit includes: an offset compensation circuit which generates an offset compensation voltage to compensate an offset voltage superposed on a direct current voltage signal; and a temperature compensation circuit which generates a temperature compensation voltage to compensate variation of a direct current reference voltage that depends on a temperature in a signal path of a sensing circuit. In the circuit, the synchronous detection circuit synchronously detects an alternating current signal, the offset compensation voltage and the temperature compensation voltage are respectively superposed on the alternating current signal which is input into the synchronous detection circuit, and the synchronous detection circuit synchronously detects the alternating current signal on which the offset compensation voltage and the temperature compensation voltage have been superposed.
    Type: Grant
    Filed: March 19, 2009
    Date of Patent: August 14, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Masahiro Kanai, Asami Kobayashi, Naoki Yoshida
  • Publication number: 20110239762
    Abstract: A method of determining a speed of a vehicle during braking is provided. A pressure p in a braking device is determined in accordance with the ideal gas equation p·V=n·R·T. V is the volume V of the brake cylinder, n is the mole number n of the gas in the brake cylinder, R is the gas constant R and T is the temperature T. The brake force F is determined from the pressure p in the brake cylinder and from the impacted piston area A of the brake cylinder in accordance with p = F A , and the instantaneous speed v of the vehicle is determined from a known initial speed vA and from the acceleration a which is determined from the brake force F and the vehicle mass M in accordance with F=M·a.
    Type: Application
    Filed: November 19, 2009
    Publication date: October 6, 2011
    Inventors: Wolfgang Rulka, Thorsten Stützle, Uwe Viereck
  • Patent number: 7997133
    Abstract: An acceleration sensor for measuring an acceleration comprises a housing including a measuring-plate, which has a first surface. The measuring plate has a second surface in parallel with and opposite to the first surface. A post is bonded via a post-bonding-face to the first surface. A temperature-compensating-element for compensating a temperature-effect caused by a temperature acting on the measuring-plate, is bonded via an element-bonding-face to the second surface of the measuring-plate. In addition, a sensor as described above is in a measuring device.
    Type: Grant
    Filed: October 11, 2006
    Date of Patent: August 16, 2011
    Assignee: Kistler Holding AG
    Inventors: Andrew Paul Cook, Norton G. Kinsley
  • Publication number: 20110127365
    Abstract: A thermally controlled gas bearing supported inertial measurement unit (IMU) system is provided. The system comprises a sensor assembly enclosing one or more sensors and a plurality of heating elements, wherein each of the plurality of heating elements is proximal to the sensor assembly. The system also comprises a plurality of temperature sensors configured to determine a temperature of a region of the sensor assembly and a control unit configured to adjust a temperature of at least one of the plurality of heating elements based on feedback from the at least one temperature sensor.
    Type: Application
    Filed: December 1, 2009
    Publication date: June 2, 2011
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventor: Charles D. Chappell
  • Publication number: 20110107852
    Abstract: An apparatus and method for estimating a parameter of interest using a force responsive element comprising, at least in part, a balanced material. The balanced material is temperature insensitive over a specified range of temperatures such that the force responsive element may estimate the parameter of interest by responding to a desired force with relatively little interference due to temperature changes within the specified range of temperatures.
    Type: Application
    Filed: November 4, 2010
    Publication date: May 12, 2011
    Applicant: BAKER HUGHES INCORPORATED
    Inventor: Carl M. Edwards
  • Patent number: 7735368
    Abstract: An acceleration sensor of the present invention is a heat sensing type acceleration sensor, and includes a heating chip formed with a heating element on a surface thereof, and a sensor chip formed with a thermocouple element on a surface thereof and disposed so that the surface faces the surface of the heating chip.
    Type: Grant
    Filed: August 2, 2007
    Date of Patent: June 15, 2010
    Assignee: Rohm Co., Ltd.
    Inventor: Goro Nakatani
  • Patent number: 7707885
    Abstract: The invention concerns gyrometric measurement compensated as a function of the instantaneous internal temperature of a mechanical resonator in a gyrometric measurement device comprising a loop controlling the amplitude of the resonator vibration and a gyrometric loop delivering a gyrometric signal (S); the gain control (P) of the loop varies as a monotonous function, preferably increasing and of the first order, of the internal temperature of the resonator in a given range of temperature; during a calibrating step, a correspondence is established and stored between the values of the gyrometric scaling factor (Fe) and the gyrometric bias (S0) and the values of the gain control signal (F), that is F(P) and Q(P) respectively; in operation, the following operations are carried out: P?F(P), P?Q(P), and ??est=F(P)·S+Q(P) which is a more precise analog estimate, compensated as a function of the internal temperature of the resonator, of the mechanical rotation of the sensitive axis of the resonator.
    Type: Grant
    Filed: February 20, 2006
    Date of Patent: May 4, 2010
    Assignee: Sagem Defense Securite
    Inventor: José Beitia
  • Publication number: 20100089155
    Abstract: A sensor unit has a reference base. An acceleration sensor block and angular velocity sensor support rods are arranged on the reference base, using a bottom face and one side face of the reference base as reference faces. Three acceleration sensors, which detect accelerations that act in the directions in which an X-axis, a Y-axis, and a Z-axis extend, are fitted to three faces of the acceleration sensor block, respectively. Three angular velocity sensors, which detect angular velocities about the X-axis, the Y-axis, and the Z-axis, are fitted to boards that are fitted, via rubber bushings serving as vibration-proofing rubber members, to the angular velocity sensor support rods with screws, respectively.
    Type: Application
    Filed: August 1, 2006
    Publication date: April 15, 2010
    Inventors: Hisayoshi Sugihara, Yutaka Nonomura, Motohiro Fujiyoshi, Kouji Tsukada
  • Publication number: 20100011834
    Abstract: An angular velocity detection circuit is connected to a resonator for making excited vibration on the basis of a drive signal and detects an angular velocity. The angular velocity detection circuit includes: a self-vibration component extraction unit that receives, from the resonator, a detection signal including an angular velocity component based on a Coriolis force and a self-vibration component based on the excited vibration and extracts the self-vibration component from the detection signal; a direct-current conversion unit including an integration unit that integrates an output signal of the self-vibration component extraction unit; and a temperature characteristic compensation unit that compensates for a variation due to a temperature in an output signal of the direct-current conversion unit.
    Type: Application
    Filed: July 16, 2009
    Publication date: January 21, 2010
    Applicant: EpsonToyocom Corporation
    Inventor: Kenji SATO
  • Publication number: 20090314082
    Abstract: According to one exemplary embodiment, a virtual turbine speed sensor for a multi-stage turbocharger system of an internal combustion engine is disclosed. The multi-stage turbocharger system includes at least two sequential turbochargers each having a compressor and a turbine. The virtual turbine speed sensor includes a compressor efficiency module, an inter-stage air temperature module, and a turbine speed module. The compressor efficiency module is configured to estimate an efficiency of a compressor of a first of the at least two turbochargers. The inter-stage air temperature module is configured to estimate an inter-stage temperature of air between the at least two compressors. The inter-stage temperature estimate is based at least partially on the efficiency of the compressor of the first turbocharger. The turbine speed module is configured to estimate a speed of a turbine of a second of the at least two turbochargers.
    Type: Application
    Filed: June 23, 2008
    Publication date: December 24, 2009
    Inventors: Vivek A. Sujan, Adrian P. Dale, Jeffrey Matthews, Kent Krajewski, David Stroh, Ryo Fuchinoue
  • Patent number: 7603902
    Abstract: A temperature compensation circuit having satisfactory linearity, a trimming circuit including a plurality of temperature gradients, and an acceleration detector having a wide applicable temperature range. A plurality of resistor elements R1 to R4, R5 to R8, R21 to R24, R25 to R28 are connected in series between a power supply voltage line and a ground voltage line. Resistor elements R9 to R14 are connected in series between connection nodes N1 and N3. Resistor elements R29 to R34 are connected in series between connection nodes N2 and N4. The resistor elements R1, R2, R4, R5, R7 to R14, R24, R25 have negative temperature coefficients. The resistor elements R3, R6, R21 to R23, R26 to R34 have positive temperature coefficients. An output terminal NT5 connects a connection node of the resistor elements R13 and R14 and a connection node of the resistor elements R30 and R29.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: October 20, 2009
    Assignee: Freescale Semiconductor, Inc.
    Inventor: Murayama Katashi
  • Patent number: 7526398
    Abstract: A method and apparatus for calibrating a gyro-sensor, by which a gyro-sensor can be calibrated using data which is obtained by measuring an angular velocity and a gyro output value of a moving body equipped with the gyro-sensor. The method includes measuring an angular velocity of a moving body and an average output value of the gyro-sensor when the moving body, equipped with the gyro-sensor, rotates, obtaining data about a characteristic equation of the gyro sensor using the measured angular velocity and the average output value and storing the data, and calibrating the gyro-sensor using the stored data about the characteristic equation.
    Type: Grant
    Filed: September 21, 2006
    Date of Patent: April 28, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ki-wan Choi, Hyuong-ki Lee, Hyeon Myeong, Yong-beom Lee
  • Patent number: 7520171
    Abstract: In a micro-electromechanical structure of semiconductor material, a detection structure is formed by a stator and by a rotor, which are mobile with respect to one another in presence of an external stress and are subject to thermal stress; a compensation structure of a micro-electromechanical type, subject to thermal stress and invariant with respect to the external stress, is connected to the detection structure thereby the micro-electromechanical structure supplies an output signal correlated to the external stress and compensated in temperature.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: April 21, 2009
    Assignee: STMicroelectronics S.r.l.
    Inventors: Angelo Merassi, Sarah Zerbini, Benedetto Vigna
  • Patent number: 7520170
    Abstract: A sensor unit for a three-axis accelerometer enabling reduction in chip size. The sensor unit is connected to an accelerometer that detects a plurality of acceleration values for a plurality of axis directions. The sensor unit includes a correction value generation circuit that sequentially generates a plurality of correction values for correcting the plurality of acceleration values. A correction circuit is connected to the correction value generation circuit to sequentially correct the plurality of acceleration values with a plurality of correction values and generate a plurality of corrected acceleration values.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: April 21, 2009
    Assignee: Freescale Semiconductor, Inc.
    Inventor: Katashi Murayama
  • Publication number: 20090095076
    Abstract: An acceleration sensor device includes: a substrate; and an acceleration sensor chip including an acceleration sensor element which has a weight portion arranged to swing according to acceleration applied, and a seating portion which supports the acceleration sensor element, the acceleration sensor chip being mounted on the substrate. A cushion member is interposed between the seating portion and the substrate, which absorbs any thermal stress occurring when the seating portion and the substrate undergo thermal expansion or thermal contraction.
    Type: Application
    Filed: August 18, 2005
    Publication date: April 16, 2009
    Inventor: Yasuhiro Tamura
  • Publication number: 20090090183
    Abstract: A method is disclosed in this invention for compensating a temperature dependent variation of an offset Voffset and sensitivity Vsensitivity parameters of an accelerometer. The method includes steps of a) Measuring a Sensitivity Vsensitivity(T0) and an Offset Voffset(T0) at a room temperature T0 to input to a microprocessor to calculate two tilt angles ?1 and ?2 in placing the accelerometer in a furnace for adjusting a controllable temperature therein; b) Keeping the accelerometer at the fixed tilt angle ?1 and adjusting the temperature of the furnace for measuring an output voltage at ?1 Vo(T, ?1) and keeping the accelerometer at another fixed tilt angle ?2 and adjusting the temperature of the furnace for measuring an output voltage at ?2 Vo(T, ?2); and c) solving equations to obtain the offset Voffset and sensitivity Vsensitivity parameters at different temperatures and storing these parameters in the microprocessor.
    Type: Application
    Filed: October 6, 2008
    Publication date: April 9, 2009
    Inventor: Ruey-Der Lou
  • Publication number: 20090031804
    Abstract: In a method of setting temperature characteristics of an angular velocity sensor, temperature characteristics of a detuning frequency are acquired. The detuning frequency is a frequency difference between an oscillation frequency of an oscillation circuit including a piezoelectric vibrator and a frequency of a voltage of the piezoelectric vibrator caused by the Coriolis force. The sensitivity to the detuning frequency is acquired. The temperature characteristics of a detection phase are acquired. The detection phase is a phase difference between a Coriolis signal phase that corresponds to a phase angle of a voltage signal and an oscillation signal phase of the oscillation circuit. The sensitivity to the detection phase is acquired. The amount of phase shift of the detection phase is determined so that the change in sensitivity caused by the change in the detuning frequency with temperature is controlled using the change in sensitivity caused by the change in the detection phase with temperature.
    Type: Application
    Filed: October 22, 2008
    Publication date: February 5, 2009
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventor: Hideaki SUGIBAYASHI
  • Patent number: 7469587
    Abstract: The acceleration measurement system has a first thermal cell optimized in sensitivity and a second thermal cell optimized in passband, which cells are connected to inputs of a servo-control loop including an amplifier presenting gain that varies as a function of input signal frequency.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: December 30, 2008
    Assignee: Sagem Defense Securite
    Inventors: Jérôme Dido, Pierre Loisel, Alain Renault, Philippe Combette, Johann Courteaud, Alain Giani
  • Publication number: 20080302182
    Abstract: A temperature compensation circuit having satisfactory linearity, a trimming circuit including a plurality of temperature gradients, and an acceleration detector having a wide applicable temperature range. A plurality of resistor elements R1 to R4, R5 to R8, R21 to R24, R25 to R28 are connected in series between a power supply voltage line and a ground voltage line. Resistor elements R9 to R14 are connected in series between connection nodes N1 and N3. Resistor elements R29 to R34 are connected in series between connection nodes N2 and N4. The resistor elements R1, R2, R4, R5, R7 to R14, R24, R25 have negative temperature coefficients. The resistor elements R3, R6, R21 to R23, R26 to R34 have positive temperature coefficients. An output terminal NT5 connects a connection node of the resistor elements R13 and R14 and a connection node of the resistor elements R30 and R29.
    Type: Application
    Filed: May 14, 2008
    Publication date: December 11, 2008
    Applicant: FREESCALE SEMICONDUCTOR, INC.
    Inventor: Murayama KATASHI
  • Patent number: 7377166
    Abstract: A detector is made up of a semiconductor integrated circuit in a part, and the semiconductor integrated circuit includes a driving circuit, an AC amplifier, a detection circuit and an amplifier circuit. An input resistor that is connected to input terminals of an operational amplifier includes an internal input resistor made up of a semiconductor integrated circuit element and an external input resistor made up of an external discrete component connected to each other in parallel. Temperature characteristics of an angular velocity sensor is compensated by a temperature coefficient (?3) that is a combination of a temperature coefficient (?1) of the internal input resistor and a temperature coefficient (?2) of the external input resistor.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: May 27, 2008
    Assignees: Fujitsu Limited, Fujitsu Media Devices Limited
    Inventors: Fumihiko Nakazawa, Masanori Yachi, Toshio Hanazawa
  • Patent number: 7292000
    Abstract: An angular velocity measuring device (1) includes a first sensor (2) (vibration gyro) and a second sensor (3) (gas rate gyro). The detection output of the first sensor (2) is inputted to a high pass filter (4). Output of the filter (4) is stored and held in time series in a memory (10). Subtraction processing means (11) successively executes processing of subtracting the output of the filter (4) ?v?(t?tsd) before a predetermined time tsd from the output of the filter (4) ?v?(1). The value thus obtained is successively added to the output of the second sensor (3) ?g(t) by addition processing means (12) so as to obtain the measurement value of the angular velocity. Thus, it is possible to provide an angular velocity measuring device capable of giving an angular velocity measurement value having a high response and stability at a reasonable cost.
    Type: Grant
    Filed: July 13, 2005
    Date of Patent: November 6, 2007
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kouji Saotome, Noriaki Okamoto, Shinyu Hirayama, Tomohiro Sakogoshi, Yoichi Shimada, Shigeto Akahori, Kengo Hori, Hitoshi Saika
  • Patent number: 7155974
    Abstract: An inertia sensor unit having a detecting element, a signal processor being constituted as an element separate from the detecting element, for at least amplifying signals output from the detecting element, and an inertia sensor mounted to a detection object for detecting acceleration or angular velocity of the detection object as an inertial force of the detection object to output electrical signals changing according to the inertial force, includes: a first temperature detecting element for detecting the temperature of the signal processor, a second temperature detecting element for detecting the temperature of the detecting element directly or indirectly, and a correcting processor for correcting the signals output from the inertia sensor based on the result detected by the first temperature detecting element and the second temperature detecting element.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: January 2, 2007
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kazutaka Saito, Akira Nakamuta, Ichiro Ueno, Fumiki Sato, Satoshi Hiyama
  • Patent number: 7069783
    Abstract: The angular velocity sensor for detecting an angular velocity for detecting movement amounts and for controlling postures of vehicles, airplanes, cameras, and the like. The angular velocity sensor is provided with a piezoelectric vibrator, a temperature compensation function generating section, a correction coefficient setting section, an oscillation section, a synchronous pulse forming section, and a Coriolis output detection section. If an angular velocity is applied to the piezoelectric vibrator vibrating in a specific direction being driven by the oscillator section, a Coriolis force acts on the piezoelectric vibrator, and a vibration is generated which is perpendicular to the vibration in a specific direction. An electric charge generated by this vibration is detected at the detection electrode of the piezoelectric vibrator.
    Type: Grant
    Filed: December 7, 2004
    Date of Patent: July 4, 2006
    Assignee: Gytronix Inc.
    Inventor: Hironobu Uehara
  • Patent number: 7033071
    Abstract: A slope correction signal setting unit is configured to output selectively one of a plurality of direct current signals according to the sensed temperature parameter signal. Levels of the plurality of direct current signals are determined to correspond to the predetermined temperature dependent characteristic of the sensor signal. An analog amplifying circuit is connected to the slope correction signal setting unit and configured to amplify the outputted direct current signal according to the sensed temperature parameter signal. An analog arithmetic circuit is connected to the analog amplifying circuit and configured to carry out a predetermined arithmetic operation based on the amplified direct current signal and the sensor signal.
    Type: Grant
    Filed: March 18, 2004
    Date of Patent: April 25, 2006
    Assignee: Denso Corporation
    Inventor: Yuzuru Otsuka