# US 10,119,985 B2 · Multi-function speed sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,119,985 B2 - Document ID: US10119985B2 - Status: Granted - Kind: B2 - Application number: 14/920,404 - Filed: 2015-10-22 - Published: 2017-04-27 - Granted: 2018-11-06 - Earliest claimed: 2015-10-22 - Assignees: Aisin Technical Center of America, Inc. - Applicants: Aisin Technical Center of America, Inc. - Inventors: Corey Zwegers - Web page: https://patentgrep.com/patent/US10119985B2 ## CPC - G01P 3/488: delivered by variable reluctance detectors - G01P 3/486: delivered by photo-electric detectors - 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}) ## Abstract A smart sensor system and method for a vehicle are described. The smart sensor includes at least one sensing element installed on a suspension of the vehicle and coupled with a wheel of the vehicle, and a digital signal processing circuitry configured to receive signal from the at least one sensing element in the form of a digital signal, correlate the digital signal to an air gap data, and determine a vehicle speed, a vehicle acceleration, a suspension condition, a tire condition, a brake condition, a wheel condition, and a road condition. ## Claims ### Claim 1 A smart sensor for a vehicle, comprising: a rotating component coupled to a wheel of the vehicle, the rotating component having a plane of rotation; at least one magnetic sensing element installed on a suspension of the vehicle and separated by an air gap from the plane of rotation such that the air gap changes over time as the suspension flexes, the at least one magnetic sensing element outputting a signal corresponding to the air gap and the sensing element; and circuitry configured to receive the signal from the at least one magnetic sensing element, determine air gap data based on the signal, perform frequency analysis of the air gap data, and determine whether the vehicle has at least one of a wheel wobble and a brake wobble based on the air gap data and the frequency analysis of the air gap data. ### Claim 2 (depends on 1) The smart sensor for a vehicle according to claim 1, wherein the air gap data includes at least one of an amplitude of the signal from the at least one magnetic sensing element over a period of time, and a frequency of the signal from the at least one magnetic sensing element over a period of time. ### Claim 3 (depends on 2) The smart sensor for a vehicle according to claim 2, wherein the at least one magnetic sensing element is a differential hall effect sensor, and the amplitude over a period of time is a differential amplitude from the differential hall effect sensor. ### Claim 4 (depends on 1) The smart sensor for a vehicle according to claim 1, wherein the circuitry includes: at least one amplifier; at least one automatic gain controller configured to control a gain of the at least one amplifier; at least one automatic offset adjustment; at least one signal filter configured to filter out signals with high frequency; and at least one analog-to-digital converter. ### Claim 5 (depends on 4) The smart sensor for a vehicle according to claim 4, wherein the circuitry determines the air gap data from the gain of at least one amplifier. ### Claim 6 (depends on 1) The smart sensor for a vehicle according to claim 1, wherein the frequency analysis is a fast Fourier transform or a discrete Fourier transform of the air gap data. ### Claim 7 (depends on 1) The smart sensor for a vehicle according to claim 1, wherein the at least one magnetic sensing element is a two channel differential sensor with a first sensing element and a second sensing element. ### Claim 8 (depends on 7) The smart sensor for a vehicle according to claim 7, wherein a signal from the second sensing element is time delayed relative to a signal from the first sensing element. ### Claim 9 (depends on 2) The smart sensor for a vehicle according to claim 2, wherein the amplitude of the signal is inversely proportional to the air gap. ### Claim 10 (depends on 1) The smart sensor for a vehicle according to claim 1, wherein the air gap is a linear distance between the rotating component and the at least one magnetic sensing element.