# US 10,766,458 B2 · Sensor fusion for passive keyless entry systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,766,458 B2 - Document ID: US10766458B2 - Status: Granted - Kind: B2 - Application number: 16/035,288 - Filed: 2018-07-13 - Published: 2020-01-16 - Granted: 2020-09-08 - Earliest claimed: 2018-07-13 - Assignees: NXP B.V. - Applicants: NXP B.V. - Inventors: Filippo Casamassima; Wolfgang Eber - Web page: https://patentgrep.com/patent/US10766458B2 ## CPC - B60R 25/24: using electronic identifiers containing a code not memorised by the user - G07C 9/00309: {operated with bidirectional data transmission between data carrier and locks} - B60R 25/209: {Remote starting of engine} - G07C 9/00658: {operated by passive electrical keys} - B60Q 1/02: the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments - B60Q 1/26: the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic - B60Q 2900/30: Lamps commanded by wireless transmissions - E05F 15/76: responsive to devices carried by persons or objects, e.g. magnets or reflectors (E05F15/77 takes precedence) - E05Y 2900/531: Doors - G07C 2009/00365: {in combination with a wake-up circuit} - G07C 2009/00507: {keyless data carrier having more than one function} - G07C 2009/00555: {comprising means to detect or avoid relay attacks} - G07C 2009/0096: {Electronic keys comprising a non-biometric sensor} - G07C 2209/63: Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE - B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL - E05F: DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING - E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF ## Abstract An electronic key a vehicle is disclosed. The electronic key includes an inertial sensor, a microcontroller coupled to the inertial sensor and a transmitter/receiver coupled to the microcontroller. The microcontroller is configured to perform an operation, the operation includes detecting a motion, turning a radio of the transmitter/receiver on, determining that a distance to the vehicle is less than a preselected distance, determining an activity using a sensor fusion process, determining that the distance to the vehicle is decreasing and performing a preselected operation on the vehicle. ## Claims ### Claim 1 An electronic key a vehicle, comprising: an inertial sensor; a microcontroller coupled to the inertial sensor; a transmitter/receiver coupled to the microcontroller; and wherein the microcontroller is configured to perform an operation, the operation includes detecting a motion, turning a radio of the transmitter/receiver on, determining that a distance to the vehicle is less than a preselected distance, determining an activity using a sensor fusion process, determining that the distance to the vehicle is decreasing and performing a preselected vehicle operation on the vehicle, wherein the turning on of the radio includes receiving a wake up signal from the vehicle and disregarding the wake up signal if the determined activity is not one of a predetermined activities. ### Claim 2 (depends on 1) The electronic key of claim 1, wherein the activity is walking or running. ### Claim 3 (depends on 2) The electronic key of claim 2, wherein if the activity is not detected for a preselected period, the radio is turned off. ### Claim 4 (depends on 1) The electronic key of claim 1, wherein the radio is turned off when the distance to the vehicle is found not decreasing. ### Claim 5 (depends on 1) The electronic key of claim 1, wherein prior to the detecting a motion, the radio is off. ### Claim 6 (depends on 1) The electronic key of claim 1, wherein prior to the detecting a motion, the microcontroller operates in a low power mode in which at least some of internal modules of the microcontroller are powered off. ### Claim 7 (depends on 1) The electronic key of claim 1, wherein the sensor fusion process includes analyzing and processing data from the inertial sensor and using calibration data to determine the activity. ### Claim 8 (depends on 1) The electronic key of claim 1, wherein upon detecting a motion, the microcontroller is configured to continuously start collecting data from the inertial sensor. ### Claim 9 (depends on 8) The electronic key of claim 8, wherein the microcontroller is configured to filter the collected data to remove high frequency noise from a output of the inertial sensor. ### Claim 10 (depends on 9) The electronic key of claim 9, wherein the microcontroller is configured to divide the filtered data into chunks. ### Claim 11 (depends on 10) The electronic key of claim 10, wherein the microcontroller is configured to analyze the chunks to extract features associated with the detected motion. ### Claim 12 (depends on 11) The electronic key of claim 11, wherein the microcontroller is configured to determine the activity based on extracted features. ### Claim 13 (depends on 1) The electronic key of claim 1, wherein the preselected vehicle operation includes at least one of opening a door, turning on lights, displaying welcome message and starting engine.