# US 9,753,054 B2 · Inertial force sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,753,054 B2 - Document ID: US9753054B2 - Status: Granted - Kind: B2 - Application number: 14/378,095 - Filed: 2013-02-18 - Published: 2015-02-05 - Granted: 2017-09-05 - Earliest claimed: 2012-02-21 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Corporation - Inventors: Isao Hattori; Takeshi Uemura; Satoshi Ohuchi; Yasunobu Tsukio - Web page: https://patentgrep.com/patent/US9753054B2 ## CPC - G01P 15/08: with conversion into electric or magnetic values - G01C 19/5776: Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719 - G01P 15/036: {for indicating predetermined acceleration values} - G01P 15/0802: {Details} - G01P 15/125: by capacitive pick-up - G01P 15/135: by making use of contacts which are actuated by a movable inertial mass - G01P 15/18: in two or more dimensions - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) - G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S) ## Abstract An inertial force sensor has a first sensor element, a second sensor element, a first signal processor, a second signal processor, and a power controller. The first sensor element converts a first inertial force to an electric signal, and the second sensor element converts a second inertial force to an electric signal. The first signal processor is connected to the first sensor element, and outputs a first inertial force value. The second signal processor is connected to the second sensor element, and outputs a second inertial force value. The power controller is connected to the first signal processor and the second signal processor, and changes power supplied to the second signal processor based on the first inertial force value. ## Claims ### Claim 1 An inertial force sensor comprising: a first sensor element configured to convert an acceleration to an electric signal; a second sensor element configured to convert an angular velocity to an electric signal; a first signal processor connected to the first sensor element and configured to output an acceleration value; a second signal processor connected to the second sensor element and configured to output an angular velocity value; and a power controller connected to the first signal processor and the second signal processor and configured to change power to be supplied to the second signal processor based on the acceleration value, wherein the power controller is configured to: decrease the power to be supplied to the second signal processor when the power supplied to the second signal processor is at a first value and the acceleration value is within a specified range for a first period, and increase the power to be supplied to the second signal processor when the power supplied to the second signal processor is at a second value smaller than the first value and the acceleration value is outside of the specified range for a second period, and wherein the second period is shorter than the first period, and wherein the second period is not zero. ### Claim 2 An inertial force sensor comprising: a first sensor element configured to convert an acceleration to an electric signal; a second sensor element configured to convert an angular velocity to an electric signal; a first signal processor connected to the first sensor element and configured to output an acceleration value; and a second signal processor connected to the second sensor element and configured to output an angular velocity value; and an output unit operable to: output a first control signal when the acceleration value is within a specified range for a first period, and output a second control signal when the acceleration value is outside of the specified range for a second period, wherein the second period is shorter than the first period, and wherein the second period is not zero. ### Claim 3 (depends on 2) The inertial force sensor according to claim 2, wherein, the first control signal shifts the inertial force sensor from a normal power mode to a power saving mode, and the second control signal shifts the inertial force sensor from the normal power mode to the power saving mode. ### Claim 4 An inertial force sensor comprising: a first sensor element configured to convert an acceleration to an electric signal; a second sensor element configured to convert an angular velocity to an electric signal; a first signal processor connected to the first sensor element and configured to output an acceleration value; and a second signal processor connected to the second sensor element and configured to output an angular velocity value; a first unit operable to receive the acceleration value and output a status value; and a second unit operable to output a first control signal when the status value is within a specified range for a first period and output a second control signal when the status value is outside of the specified range for a second period, wherein the second period is shorter than the first period, and wherein the second period is not zero. ### Claim 5 (depends on 4) The inertial force sensor according to claim 4, wherein, the first control signal shifts the inertial force sensor from a normal power mode to a power saving mode, and the second control signal shifts the inertial force sensor from the normal power mode to the power saving mode. ### Claim 6 (depends on 4) The inertial force sensor according to claim 4, wherein the first unit outputs a first status signal indicating a stationary state when the acceleration value is within a specified range with a center defined by a reference value, and otherwise outputs a second status signal indicating an operating state.