SYSTEM AND METHOD FOR PERFORMING AUTO-LOCATION OF A TIRE PRESSURE MONITORING SENSOR ARRANGED WITH A VEHICLE WHEEL USING CONFIDENCE INTERVAL ANALYSIS AND CHANGE OF WHEEL DIRECTION

• Main Authors: BAIRD STEVEN, WALKER PETER, GREER JOHN, COALTER JAMES, MILLEN ALAN, GRAHAM GARY, FRIEL EDWARD
• Format: Patent
• Language: English; Korean
• Published: 29.04.2016
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; DEVICES OR ARRANGEMENTS RELATED TO TYRES; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; MEASURING; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; PERFORMING OPERATIONS; PHYSICS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; TESTING; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLE TYRES; VEHICLES IN GENERAL

차량 방향의 변화를 결정하기 위한 방법은 ABS 치부 카운트(tooth count)를 가리키는 ABS 데이터의 롤링 윈도우(rolling window)를 유지하고 미리 결정된 하나의 측정 포인트에서 ABS 데이터의 관련 롤링 윈도우를 캡처링하는 단계; ABS 치부를 가리키는 ABS 데이터의 롤링 윈도우를 버퍼에 저장하는 단계; ABS 데이터를 모니터링하고 ABS 치부 카운트의 변화 레이트를 실질적으로 제로로 감소시키게 하는 유효 정지 이벤트를 검출하는 단계; 및 ABS 데이터를 모니터링하고 ABS 치부 카운트의 변화 레이트를 실질적으로 제로로부터 증가시키게 하는 유효 이동 이벤트를 검출하는 단계를 포함한다. 방법은 또한 유효 정지 이벤트 직전에 버퍼에 저장된 ABS 치부 카운트에 기초하여 적어도 2개의 휠들 사이의 프레스토(presto) 위상 관계를 결정하는 단계; 유효 이동 이벤트 직후 버퍼에 저장된 ABS 치부 카운트에 기초하여 적어도 2개의 휠들 사이에서 시작 후 위상 관계를 결정하는 단계; 및 방향 변화 및 신뢰 레벨을 결정하기 위하여 정지 전 위상 관계와 시작 후 위상 관계를 상관시키는 단계를 포함한다. A method for determining change of direction of a vehicle includes steps of maintaining a rolling window of ABS data indicative of ABS tooth count and capturing a relevant rolling window of ABS data at the predetermined one-measurement point; storing the rolling window of the ABS data indicative of ABS tooth in a buffer; monitoring the ABS data and detecting a valid stop event which causes the rate of change of ABS tooth count to substantially decrement to zero; and monitoring the ABS data and detecting a valid move event which causes the rate of change of ABS tooth count to substantially increment from zero. The method also includes steps of determining a pre-stop phase relationship between at least two wheels based on the ABS tooth count stored in the buffer immediately prior to the valid stop event; determining a post-start phase relationship between at least two wheels based on the ABS tooth count stored in the buffer immediately subsequent to the valid move event; and correlating the pre-stop phase relationship and the post-start phase relationship to determine change of direction and confidence level.