Method for actuating a solenoid valve, and compressed-air installation comprising a solenoid valve

Patent metadata

Field	Value
Publication number	US-2020056718-A1
Application number	US-201916545193-A
Country	US
Kind code	A1
Filing date	Aug 20, 2019
Priority date	Aug 20, 2018
Publication date	Feb 20, 2020
Grant date	—

Abstract

A method for actuating a solenoid valve, which is loaded with a pneumatic pressure medium, in order to reduce a pressure (psys) which is applied to the solenoid valve, where the solenoid valve assumes a closed switching position in the deenergized state and assumes a completely open switching position when it is energized with a switching current intensity (Is(p)) which is dependent on the applied pressure (psys), where a first rise current final value (I1) is predetermined, which first rise current final value is smaller than the switching current intensity (Is(p)), where the solenoid valve is energized with an actuating current which follows an actuating current profile (SV1, SV2), and where the actuating current profile (SV1, SV2) comprises a first rise phase (TA1), in which the actuating current is increased to the predetermined first rise current final value (I1), and, following said first rise phase, a first holding phase (TH1) in which the actuating current is held constant at the first rise current final value (I1).

First claim

1 . A method for actuating a solenoid valve, the solenoid valve loaded with a pneumatic pressure medium, in order to reduce a pressure (p sys ) applied to the solenoid valve, where the solenoid valve assumes a closed switching position in a deenergized state and assumes a completely open switching position when it is energized with a switching current intensity (I s(p) ) which is dependent on the applied pressure (p sys ), the method comprising:
predetermining a first rise current final value (I 1 ) is predetermined, which first rise current final value is smaller than the switching current intensity (I s(p) ); energizing the solenoid valve with an actuating current which follows an actuating current profile (SV 1 , SV 2 ), and wherein the actuating current profile (SV 1 , SV 2 ) comprises a first rise phase (TA 1 ); increasing the actuating current to the predetermined first rise current final value (I 1 ) during the first rise phase (TA 1 ); and holding the actuating current constant at the first rise current final value (I 1 ) during a first holding phase (TH 1 ), where the first holding phase (TH 1 ) follows the first rise phase.

2 . The method as claimed in claim 1 , wherein the first rise current final value (I 1 ) is determined depending on the pressure (p sys ) which is applied to the solenoid valve.

3 . The method as claimed in claim 2 , further comprising measuring the pressure (p sys ) at a beginning of the actuating current profile (SV 1 , SV 2 ) and/or during the holding phase (TH 1 ).

4 . The method as claimed in claim 1 , wherein the first rise current final value (I 1 ) is prespecified.

5 . The method as claimed in claim 1 , wherein the actuating current is increased in a linear manner or in an abrupt manner during the first rise phase (TA 1 ).

6 . The method as claimed in claim 1 , wherein a duration of the first rise phase (TA 1 ) and of the first holding phase (TH 1 ) is predetermined.

7 . The method as claimed in claim 1 , wherein the actuating current profile (SV 1 , SV 2 ) comprises a second rise phase (TA 2 ) which follows the first holding phase (TH 1 ).

8 . The method as claimed in claim 7 , wherein the actuating current is increased to a determinable second rise current final value (I 2 ) during the second rise phase (TA 2 ).

9 . The method as claimed in claim 8 , wherein the actuating current profile (SV 1 , SV 2 ) comprises a second holding phase (TH 2 ) which follows the second rise phase (TA 2 ) and in which the actuating current is held constant at the second rise current final value (I 2 ), where the second rise current final value (I 2 ) is smaller than the switching current intensity (I s(p) ).

10 . The method as claimed in claim 7 , wherein the actuating current is increased to the switching current intensity (I s(p) ) in a linear manner or in the form of a jump during the second rise phase (TA 4 ).

11 . The method as claimed in claim 1 , wherein the actuating current profile (SV 1 , SV 2 ) is superimposed with an additional signal profile.

12 . A compressed-air installation comprising:
a solenoid valve loaded with a pneumatic pressure medium in order to reduce a pressure (p sys ) applied to the solenoid valve; the solenoid valve assumes a closed switching position in a deenergized state and assumes a completely open switching position when it is energized with a switching current intensity (I s(p) , the switching current intensity (I s(p) ) is dependent on the applied pressure (p sys ); wherein a first rise current final value (I 1 ) is predetermined, which first rise current final value is smaller than the switching current intensity (I s(p) ), where the solenoid valve ( 20 ) is energized with an actuating current which follows an actuating current profile (SV 1 , SV 2 ), and wherein the actuating current profile (SV 1 , SV 2 ) comprises a first rise phase (TA 1 ), in which the actuating current is increased to the predetermined first rise current final value (I 1 ), and, following said first rise phase, a first holding phase (TH 1 ) in which the actuating current is held constant at the first rise current final value (I 1 ). a solenoid valve and a control unit, wherein a method as claimed in one of claims 1 to 11 is carried out in said compressed-air installation.

13 . The compressed-air installation as claimed in claim 12 , further comprising an air compressor and at least one pressure medium chamber, where the pressure medium chamber is connected to the air compressor via a pneumatic main line, where the main line is connected to an air discharge line which comprises a discharge valve, where the solenoid valve is the discharge valve.

14 . The compressed-air installation as claimed in claim 12 , wherein the system pressure (p sys ) of the compressed-air installation is applied to an input side of the solenoid valve.

15 . The compressed-air installation as claimed in claim 12 , wherein there is no muffler.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Hein Dierk
• Wassermann Patrick

Classifications

• B60G17/056

  Regulating distributors or valves {for hydropneumatic systems}(B60G17/044 - B60G17/048, {B60G17/0416} take precedence; {Fluid interconnection systems to control vehicle inclination B60G21/06, B60G21/10}; valves per se F16K) · CPC title

• B60G17/0528

  Pressure regulating or air filling valves · CPC title

• B60G17/0523 Primary

  Regulating distributors or valves for pneumatic springs · CPC title

• B60G11/27 Primary

  wherein the fluid is a gas · CPC title

• B60G2400/51222

  Pneumatic · CPC title