Method and device for determining a pressure in a high-pressure accumulator
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-059/46
F02D-041/38
F02M-047/02
출원번호
US-0265667
(2010-03-30)
등록번호
US-8726885
(2014-05-20)
우선권정보
DE-10 2009 018 288 (2009-04-21)
국제출원번호
PCT/EP2010/054189
(2010-03-30)
§371/§102 date
20111021
(20111021)
국제공개번호
WO2010/121889
(2010-10-28)
발명자
/ 주소
Brandt, Martin
출원인 / 주소
Continental Automotive GmbH
대리인 / 주소
King & Spalding L.L.P.
인용정보
피인용 횟수 :
1인용 특허 :
7
초록▼
An injection valve is hydraulically coupled to a high-pressure accumulator in order to supply a fluid. The injection valve has a longitudinal axis, an injection needle, and an actuator. The actuator is designed to act on the injection needle. A pre-defined amount of electrical energy is supplied to
An injection valve is hydraulically coupled to a high-pressure accumulator in order to supply a fluid. The injection valve has a longitudinal axis, an injection needle, and an actuator. The actuator is designed to act on the injection needle. A pre-defined amount of electrical energy is supplied to the actuator in order to modify an axial length of the actuator in such a way that the injection needle moves out of the closed position. Once the pre-defined amount of electrical energy has been supplied, a first voltage value and a second voltage value are detected and/or determined by the actuator at respectively different pre-defined moments. On the basis of the first and second voltage values, a differential voltage value is determined, on the basis of which a first pressure is determined, which represents a pressure in the high-pressure accumulator.
대표청구항▼
1. A method for determining a pressure in a high-pressure accumulator which is hydraulically coupled to an injection valve in order to supply fluid, wherein the injection valve has a longitudinal axis, an injection needle and an actuator designed as a solid body actuator, wherein the actuator is des
1. A method for determining a pressure in a high-pressure accumulator which is hydraulically coupled to an injection valve in order to supply fluid, wherein the injection valve has a longitudinal axis, an injection needle and an actuator designed as a solid body actuator, wherein the actuator is designed to act on the injection needle, and the injection needle is designed to prevent a fluid flow through at least one injection opening in a closed position and otherwise to open up the fluid flow, the method comprising: supplying a predefined amount of electrical energy to the actuator in order to modify an axial length of the actuator, specifically in such a manner that the injection needle is moved out of the closed position,after the predefined amount of electrical energy has been supplied, determining a first and a second voltage value by means of the actuator at respectively different predefined moments,determining a differential voltage value on the basis of the first and second voltage values, anddetermining a first pressure which is representative of a pressure in the high-pressure accumulator on the basis of the differential voltage value. 2. The method according to claim 1, in which the high-pressure accumulator comprises at least one pressure sensor for detecting a second pressure which is representative of the pressure in the high-pressure accumulator. 3. The method according to claim 1, wherein the first pressure is determined when the at least one pressure sensor is defective. 4. The method according to claim 1, wherein the first or second pressure is checked for plausibility with reference to the second or first pressure. 5. The method according to claim 1, further comprising: determining the first pressure on the basis of the differential voltage value with reference to a predefined characteristic diagram,when the pressure sensor is error-free, detecting the second pressure is,determining the differential voltage value substantially isochronously, andadapting the characteristic diagram on the basis of the detected second pressure and the associated differential voltage value. 6. The method according to claim 1, wherein the first voltage value is detected at a moment at which the voltage across the actuator is at maximum. 7. The method according to claim 1, wherein the second voltage value is determined at a moment at which the voltage across the actuator is virtually stationary. 8. The method according to claim 1, wherein after the predefined amount of electrical energy has been supplied, a plurality of voltage values is detected, and at least one of the first and second voltage value is in each case determined with reference to the formation of a mean of a respective predefined selection of the voltage values detected. 9. A device for determining a pressure in a high-pressure accumulator which is hydraulically coupled to an injection valve in order to supply fluid, wherein the injection valve comprises a longitudinal axis, an injection needle and an actuator designed as a solid body actuator, wherein the actuator is designed to act on the injection needle, and the injection needle is designed to prevent a fluid flow through at least one injection opening in a closed position and otherwise to open up the fluid flow, wherein the device is designed to supply a predefined amount of electrical energy to the actuator in order to modify an axial length of the actuator, specifically in such a manner that the injection needle is moved out of the closed position,after the predefined amount of electrical energy has been supplied, to detect and/or to determine a first and a second voltage value by means of the actuator at respectively different predefined moments,to determine a differential voltage value on the basis of the first and second voltage values,to determine a first pressure which is representative of a pressure in the high-pressure accumulator on the basis of the differential voltage value. 10. The device according to claim 9, wherein the high-pressure accumulator comprises at least one pressure sensor for detecting a second pressure which is representative of the pressure in the high-pressure accumulator. 11. The device according to claim 9, wherein the first pressure is determined when the at least one pressure sensor is defective. 12. The device according to claim 9, wherein the first or second pressure is checked for plausibility with reference to the second or first pressure. 13. The device according to claim 9, wherein the device is furthermore configured: to determine the first pressure on the basis of the differential voltage value with reference to a predefined characteristic diagram,when the pressure sensor is error-free, to detect the second pressure,to determine the differential voltage value substantially isochronously, andto adapt the characteristic diagram on the basis of the detected second pressure and the associated differential voltage value. 14. The device according to claim 9, wherein the first voltage value is detected at a moment at which the voltage across the actuator is at maximum. 15. The device according to claim 9, wherein the second voltage value is determined at a moment at which the voltage across the actuator is virtually stationary. 16. The device according to claim 9, wherein the device is further configured to detect, after the predefined amount of electrical energy has been supplied, a plurality of voltage values, and to determine at least one of the first and second voltage value in each case with reference to the formation of a mean of a respective predefined selection of the voltage values detected.
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이 특허에 인용된 특허 (7)
Schmidt Karl H. (Vienna ATX), Circuit arrangement to detect signals indicating a change in current through a needle lift sensor of an injection nozzle.
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