METHOD AND DEVICE FOR DETERMINING THE STATE OF AN ELECTRICALLY CONTROLLED VALVE

• US 20130169287A1
• Filed: 08/04/2011
• Published: 07/04/2013
• Est. Priority Date: 08/11/2010
• Status: Active Grant

• Current Assignee: Danfoss Power Solutions GmbH & Co. OHG (Danfoss A/S)
• Original Assignee: Sauer-Danfoss GmbH & Co. OHG
• Inventors: Fink, Sven, Saterbak, Matt
• Granted Patent: US 10,429,427 B2
• Time in Patent Office: Days
• US Class Current: 324/511
• CPC Class Codes: G01R 31/00 Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere measuring superconductive properties G01R33/1238; testing or measuring semiconductors or solid state devices during manufacture H01L22/00; testing line transmission systems H04B3/46
• CPC Class Codes: G01R 31/3275 Fault detection or status indication
• CPC Class Codes: G01R 31/3278 of relays, solenoids or reed switches measuring contact resistance G01R27/205; high voltage magnetic switches G01R31/3271, G01R31/333; testing electric windings G01R31/72; monitoring of fail safe circuits H01H47/002
• CPC Class Codes: G01R 31/72 Testing of electric windings testing of transformers G01R31/62
• CPC Class Codes: H01H 47/325 by switching regulator

Abstract

The invention relates to a method (3) for determining (33) a state characteristic value (28) of a electric device (4) controlled by a temporally variable control signal (17). The at least one state characteristic value (28) is determined using the frequency of the temporally variable control signal (17) and/or the switching characteristics of the temporally variable control signal (17).

Claims

1. A method for determining at least one state characteristic value of an electrical device actuated at least sometimes and/or at least partly with a time-varying control signal, wherein the at least one state characteristic value is determined at least sometimes and/or at least partly by using the frequency of the time-varying control signal and/or the switching characteristics of the time-varying control signal.

2. The method according to claim 1, wherein the time-varying control signal is at least sometimes and/or at least partially a pulselike control signal and/or at least sometimes and/or at least partially a cyclical control signal, especially a pulse width modulated type control signal and/or a square-wave control signal.

3. The method according to claim 1, wherein the electrical device is at least sometimes and/or at least partially an electrical device having an induction mechanism, in particular, it is an electric motor mechanism, an electrical coil mechanism, and/or an actuator mechanism, preferably an actuator mechanism for a valve mechanism.

4. The method according claim 1, wherein the electrical device is operated at least sometimes and/or at least partially in non-quasistationary and/or nonstationary mode.

5. The method according to claim 1, wherein the at least one state characteristic value constitutes at least sometimes and/or at least partially a measure of a position of at least parts of the electrical device, a measure of reaching certain positions, especially prominent ones, of at least parts of the electrical device, a measure of the velocity of at least parts of the electrical device and/or a measure of the occurrence of at least one error event.

6. The method according to claim 1, wherein the electrical device is actuated at least sometimes and/or at least partially with a maximum current limiting method.

7. The method according to claim 1, wherein at least one electrical device, actuated with the time-varying control signal, is used at least sometimes and/or at least partially for an at least partially electrically switched hydraulic pump and/or for an at least partially electrically switched hydraulic motor.

8. The method according to claim 1, wherein the at least one state characteristic value is determined at least sometimes and/or at least partially by a measurement of the absolute value of the switching frequency of the time-varying control signal and/or by a measurement of a change in the switching frequency of the time-varying control signal and/or by a measurement of the absolute value of the switching characteristics of the time-varying control signal and/or by a measurement of a change in the switching characteristics of the time-varying control signal.

9. An electrical control device for the at least sometimes and/or at least partial determination of at least one state characteristic value of an electrical device actuated by a time-varying control signal, which is designed and organized such that it performs a method according of to claim 1 at least sometimes and/or at least partially.

10. The electrical control device according to claim 9, wherein it is configured at least partially as an electronic control device, especially at least partially as a program-controlled computer mechanism.

11. An electrically switched hydraulic pump and/or electrically switched hydraulic motor, wherein it is at least sometimes and at least partially actuated making use of a method according to claim 1 and/or in that it has at least one electrical control device.

12. The method according to claim 2, wherein the electrical device is at least sometimes and/or at least partially an electrical device having an induction mechanism, in particular, it is an electric motor mechanism, an electrical coil mechanism, and/or an actuator mechanism, preferably an actuator mechanism for a valve mechanism.

13. The method according claim 2, wherein the electrical device is operated at least sometimes and/or at least partially in non-quasistationary and/or nonstationary mode.

14. The method according claim 3, wherein the electrical device is operated at least sometimes and/or at least partially in non-quasistationary and/or nonstationary mode.

15. The method according to claim 2, wherein the at least one state characteristic value constitutes at least sometimes and/or at least partially a measure of a position of at least parts of the electrical device, a measure of reaching certain positions, especially prominent ones, of at least parts of the electrical device, a measure of the velocity of at least parts of the electrical device and/or a measure of the occurrence of at least one error event.

16. The method according to claim 3, wherein the at least one state characteristic value constitutes at least sometimes and/or at least partially a measure of a position of at least parts of the electrical device, a measure of reaching certain positions, especially prominent ones, of at least parts of the electrical device, a measure of the velocity of at least parts of the electrical device and/or a measure of the occurrence of at least one error event.

17. The method according to claim 4, wherein the at least one state characteristic value constitutes at least sometimes and/or at least partially a measure of a position of at least parts of the electrical device, a measure of reaching certain positions, especially prominent ones, of at least parts of the electrical device, a measure of the velocity of at least parts of the electrical device and/or a measure of the occurrence of at least one error event.

18. The method according to claim 2, wherein the electrical device is actuated at least sometimes and at least partially with a maximum current limiting method.

19. The method according to claim 3, wherein the electrical device is actuated at least sometimes and at least partially with a maximum current limiting method.

20. The method according to claim 4, wherein the electrical device is actuated at least sometimes and at least partially with a maximum current limiting method.