Sensorless position measurement method for solenoid-based actuation devices using inductance variation
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01B-007/14
G01B-007/30
출원번호
US-0197163
(2005-08-03)
등록번호
US-7511478
(2009-03-31)
발명자
/ 주소
Ganev,Evgeni
출원인 / 주소
Honeywell International Inc.
대리인 / 주소
Caglar, Esq.,Oral
인용정보
피인용 횟수 :
1인용 특허 :
10
초록▼
A sensorless position measurement method may be used to determine the position of a solenoid-based actuator which controls some substance. The sensorless position measurement method of the present invention eliminates the need for a dedicated sensor in the actuator device, as well as the associated
A sensorless position measurement method may be used to determine the position of a solenoid-based actuator which controls some substance. The sensorless position measurement method of the present invention eliminates the need for a dedicated sensor in the actuator device, as well as the associated electrical connections between this sensor and the system controller.
대표청구항▼
I claim: 1. A method for determining position of a solenoid-based actuator which controls a substance, the method comprising: applying a modulated voltage to a coil of a solenoid to produce a control current in the coil; measuring a change in a solenoid ripple current, wherein the change in the sol
I claim: 1. A method for determining position of a solenoid-based actuator which controls a substance, the method comprising: applying a modulated voltage to a coil of a solenoid to produce a control current in the coil; measuring a change in a solenoid ripple current, wherein the change in the solenoid ripple current is variable, as a function of the position of the solenoid-based actuator; and calculating a correlation between the measured change in solenoid ripple current and a position of the solenoid-based actuator controlling the substance wherein a two-state modulation or a three-state modulation scheme is used to produce a constant frequency from the solenoid. 2. The method according to claim 1, wherein the solenoid-based actuator is positioned near the substance. 3. The method according to claim 2, wherein the step of measuring the changes in the solenoid ripple current and the step of calculation the correlation between the measured changes in the solenoid ripple current and the position of the substance is performed in a controller separate from the actuator device. 4. The method according to claim 3, further comprising electronically connecting the actuator device with the controller via a solenoid control feeder and a feeder return. 5. The method according to claim 1, wherein the modulated voltage is applied via a pulsewidth modulation controller and a switching regulator. 6. The method according to claim 1, further comprising look up table inductance to air gap correlation to determine the position of the solenoid-based actuator and the state of the substance. 7. The method according to claim 1, wherein the actuator device is selected from the group consisting of relays, valves, electromechanical brakes and electromechanical clutches. 8. A method for the sensorless measurement of the state of a controlled substance, the method comprising: applying a modulated voltage to a solenoid of an actuator device; measuring a current ripple produced by the solenoid; wherein said current ripple is variable, as a function of the position of the controlled substrate; and inputting the measured current ripple into a look-up table to correlate the current ripple produced by the solenoid with the position of the actuator device used to define the state of the controlled substance; wherein a two-state modulation or a three-state modulation scheme will be used to produce a constant frequency from the solenoid. 9. The method according to claim 8, wherein the modulated voltage is applied via a pulsewidth modulation controller and a switching regulator. 10. The method according to claim 8, further comprising electronically connecting the actuator device with a controller via a solenoid control feeder and a feeder return. 11. The method according to claim 10, further comprising: sensing a return current in a current sensor via the feeder return; converting the sensed current with an analog/digital converter within the controller; and detecting the current ripple with a peak detector. 12. A device for measuring the position of a solenoid-based actuator and a substance comprising: an actuator device; a solenoid within the actuator device; a controller located separately from the actuator device; a solenoid control feeder for supplying a modulated voltage to the solenoid; a feeder return for determining a ripple current in the solenoid; and a current sensor, an analog/digital converter and a ripple detector for measuring the ripple current in the solenoid, wherein the ripple current magnitude is determined based on the following equation: description="In-line Formulae" end="lead"ipp=-Vdc/(2*L*f) description="In-line Formulae" end="tail" where ipp=ripple current magnitude; Vdc=supply voltage; L=solenoid inductance; and f=modulation frequency. 13. The device according to claim 12, further comprising a pulsewidth controller and a switching regulator to provide the modulated voltage to the solenoid. 14. The device according to claim 12, wherein the pulsewidth controller and the switching regulator are located in the controller, the controller being separate from the actuator device. 15. The device according to claim 12, wherein the current sensor, the analog/digital converter and the ripple detector are located in the controller, the controller being separate from the actuator device. 16. The device according to claim 12, wherein the actuator device is one of a linear actuator, a rotary actuator and a contactor. 17. The device according to claim 12, wherein the actuator device is from the group consisting of relays, valves, electromechanical brakes and electromechanical clutches.
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이 특허에 인용된 특허 (10)
Curtis John F. (Brighton GBX) Jayawant Bhalchandra V. (Kingston near Lewes GBX) Whorlow Raymond J. (Brighton GBX), Apparatus for monitoring inductance.
Nippert Andrew H. (Washington IL), Method and apparatus for determining the position of an armature in an electromagnetic actuator by measuring the driving.
Oudyn Michael K. (Peoria IL) Medanic Juraj (Champaign IL), Method and apparatus for determining the position of an armature in an electromagnetic actuator using observer theory.
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