# US 12,015,284 B2 · Low frequency sensor based apparatus and method for measuring vehicle position > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,284 B2 - Document ID: US12015284B2 - Status: Granted - Kind: B2 - Application number: 18/086,367 - Filed: 2022-12-21 - Published: 2023-04-20 - Granted: 2024-06-18 - Earliest claimed: 2018-10-25 - Assignees: Hyundai Motor Company; Kia Corporation; Hyundai Autron Co., Ltd. - Applicants: Hyundai Motor Company; Kia Corporation; Hyundai Autron Co., Ltd. - Inventors: Jae Yong Seong; Chang Woo Ha; Ki Won Ko; Bong Ju Kim - Web page: https://patentgrep.com/patent/US12015284B2 ## CPC - H02J 50/90: involving detection or optimisation of position, e.g. alignment - B60L 53/12: Inductive energy transfer - B60L 53/36: by positioning the vehicle - B60L 53/66: Data transfer between charging stations and vehicles - G01B 7/003: {for measuring position, not involving coordinate determination (coordinate measuring G01B7/004)} - G07C 5/08: Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time - B60L 53/38: specially adapted for charging by inductive energy transfer - B60L 2240/14: Acceleration - B60L 2240/22: Yaw angle - B60L 2240/461: Speed - B60L 2240/62: Vehicle position - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 10/72: Electric energy management in electromobility - Y02T 90/12: Electric charging stations - Y02T 90/14: Plug-in electric vehicles - Y02T 90/16: Information or communication technologies improving the operation of electric vehicles - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for measuring a position, is performed by a vehicle assembly (VA) for alignment between a ground assembly (GA) and the VA. The method includes transmitting low frequency (LF) signals to initiate alignment with the GA and estimating a position of a vehicle using at least one sensor mounted on the vehicle. Information regarding the estimated position of the vehicle is provided to the GA and information regarding a position of the vehicle measured by LF receive antennas of the GA and an acceleration flag calculated by the GA is received. Accordingly, a transmission strength of the LF signals transmitted by the VA is adjusted based on the information regarding the position of the vehicle measured by the LF receive antennas and the acceleration flag. ## Claims ### Claim 1 A method for measuring a position, performed by a ground assembly (GA) for alignment between the GA and a vehicle assembly (VA), the method comprising: detecting, by a controller, low frequency (LF) signals transmitted by the VA through LF receive antennas of the GA; calculating, by the controller, a position of a vehicle based on the LF signals; receiving, by the controller, information regarding a position of the vehicle estimated by the VA; calculating, by the controller, an acceleration flag by comparing the position of the vehicle calculated based on the LF signals with the position of the vehicle estimated by the VA; and transmitting, by the controller, information regarding the position of the vehicle calculated based on the LF signals and the acceleration flag to the VA. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: determining, by the controller, whether at least one the LF receive antennas is saturated as the vehicle is positioned on a power transmission pad; and notifying, by the controller, the VA that the at least one of the LF receive antennas is saturated. ### Claim 3 (depends on 2) The method according to claim 2, wherein the determining of whether at least one of the LF receive antennas is saturated includes: determining, by the controller, that at least one of the LF receive antennas is saturated when the position of the vehicle calculated based on the LF signals does not change although the position of the vehicle estimated by the VA changes. ### Claim 4 (depends on 1) The method according to claim 1, wherein the transmission strength of the LF signals transmitted by the VA decreases linearly as a distance between the VA and the GA decreases. ### Claim 5 (depends on 1) The method according to claim 1, wherein the transmission strength of the LF signals transmitted by the VA is adjusted using a default interpolation table derived by linearizing signal strengths for respective distances measured by the LF receive antennas and a position correction table derived based on the acceleration flag. ### Claim 6 (depends on 1) The method according to claim 1, wherein the estimated position of the vehicle is calculated based on a wheel speed and a yaw rate, which are sensed by at least one sensor mounted on the vehicle.