Electromagnetic valve and a method for operating an electromagnetic valve

Abstract

The invention relates to an electromagnetic valve (10), in particular for a cooling circuit of a motor vehicle, with features of claim 1 and a method for operating such an electromagnetic valve (10).

Description

State of the art

[0001] The invention relates to an electromagnetic valve, in particular for a cooling circuit of a motor vehicle, with features of claim 1 and a method for operating such an electromagnetic valve.

[0002] Electromagnetic valves can be used, for example, in a vehicle's cooling system. By opening and closing the valves, the flow of coolant and thus thermal management of the cooling system can be achieved with simple means. The electromagnetic valve can be energized to open and close.

[0003] The disadvantage is that an electrical current, i.e., energy, is required both to open and close the valve, as well as to hold the valve in the open or closed state. Disclosure of the invention

[0004] The invention proposes an electromagnetic valve. The electromagnetic valve can be configured for a cooling circuit of a motor vehicle. The electromagnetic valve comprises an electromagnetic coil for generating a magnetic force. The valve includes an armature arranged within the coil and movable by means of the coil's magnetic force. The valve includes a piston that interacts with the armature. The piston can be arranged on or connected to the armature. It is also conceivable that the armature and the piston can be separate parts and not connected to each other. The valve includes a valve disc. The valve disc can be arranged in a valve seat. The valve disc is arranged on the piston.The armature, piston, and / or valve disc are designed to move between an open position (the valve is then fully open) and a closed position (the valve is then fully closed). In the open position, fluid can flow through the valve. In the closed position, no fluid can flow through the valve. The valve includes a permanent magnet. The permanent magnet is designed to generate a magnetic force.

[0005] The valve is designed such that when the armature, piston and / or valve disc are in the closed position, the armature, piston and / or valve disc are held in the closed position by the magnetic force of the permanent magnet.

[0006] This allows the valve to be opened or closed with a single, brief, and especially pulsed, actuation of the valve or by a single, brief, and especially pulsed, energization of the coil. A simple and cost-effective valve can be implemented. Electrical energy can be saved by more than 95%. The magnetic force of the permanent magnet holds the armature, piston, and / or valve disc in the closed position (and thus the valve closed) even without current.

[0007] According to a further development of the valve, the valve can include a spring. The armature, the piston and / or the valve disc can be pre-tensioned into the open position by the spring force.

[0008] This allows the movement of the armature, piston and / or valve disc into the open position to be achieved using simple means, especially without electricity.

[0009] According to a further development of the valve, the permanent magnet can be ring-shaped.

[0010] This allows the permanent magnet to be implemented using simple means and mounted inside the valve. A magnetic force that is as uniform as possible can be generated.

[0011] According to a further development of the valve, the permanent magnet can be arranged between the armature and the valve disc.

[0012] This allows the magnetic force generated by the permanent magnet to act optimally on the armature.

[0013] According to a further development of the valve, the permanent magnet and / or the spring can be designed such that the magnetic force of the permanent magnet acting on the armature (and thus the piston and / or the valve disc) in the closed position is greater than the spring force of the spring acting on the armature (and thus the piston and / or the valve disc) in the closed position.

[0014] This ensures, using simple means, that the armature, piston and / or valve disc are held in the closed position by means of the magnetic force of the permanent magnet.

[0015] According to a further development of the valve, the permanent magnet can be designed in such a way that the magnetic force of the permanent magnet is insufficient to move the armature, the piston and / or the valve disc from the open position to the closed position.

[0016] This ensures, using simple means, that the armature, piston and / or valve disc are kept in the open position.

[0017] According to a further development of the valve, the spring can be designed in such a way that the spring force is insufficient to move the armature, the piston and / or the valve disc from the closed position to the open position.

[0018] This ensures, using simple means, that the armature, piston and / or valve disc are kept in the closed position.

[0019] According to the invention, a method for operating an electromagnetic valve as described above is proposed. The method comprises the following steps: Brief, especially pulsed, current flow to the coil with an initial current strength to move the armature, piston and / or valve disc from the open position to the closed position.

[0020] Regarding the advantages achievable with this method, reference is made to the relevant explanations concerning the electromagnetic valve. The measures described in connection with the valve and / or those explained below can be used to further develop the method.

[0021] According to a further development of the procedure, the procedure can include the following step: Briefly, especially pulsed, energizing the coil with a second current to move the armature, piston, and / or valve disc from the closed to the open position, where the second current has the opposite polarity to the first. For example, the first current can be positive and the second negative. It is conceivable that the magnitude of the first current could be greater than that of the second. It is equally conceivable that the magnitudes of the first and second currents could be the same.

[0022] This allows the armature, piston and / or valve disc to be moved from the closed position to the open position using simple means.

[0023] According to a further development of the procedure, the procedure can include the following step: Holding the armature, piston and / or valve disc in the closed position by means of the magnetic force of the permanent magnet. This allows the armature, piston and / or valve disc to be held in the closed position (and thus the valve closed) using simple means and especially without electricity.

[0024] One embodiment of the invention is explained below with reference to the accompanying drawings. These show: Fig. 1 a schematic sectional view of an electromagnetic valve in a first state and a corresponding state diagram, Fig. 2 a schematic sectional view of the valve according to Fig. 1 in a second state and a corresponding state diagram, Fig. 3 a schematic sectional view of the valve according to Fig. 1 in a third state and a corresponding state diagram, Fig. 4 a schematic sectional view of the valve according to Fig. 1 in a fourth state and a corresponding state diagram and Fig. 5 a schematic sectional view of the valve according to Fig. 1 in a fifth state and a corresponding state diagram.

[0025] Fig. Figures 1 to 5 each show a schematic sectional view of an electromagnetic valve 10 in a different state and a corresponding state diagram 28. The electromagnetic valve 10 can be configured for a cooling circuit of a motor vehicle.

[0026] The valve 10 comprises an electromagnetic coil 12 for generating a magnetic force. The valve 10 includes an armature 14 arranged within the coil 12 and movable by means of the magnetic force of the coil 12. The valve 10 includes a piston 16 that interacts with the armature 14. The piston 16 can be arranged on or connected to the armature 14. It is also conceivable that the piston 16 and the armature 14 can be designed as two separate parts that are not connected to each other. The valve 10 includes a valve disc 18. The valve disc 18 is arranged on the piston 16. The armature 14, the piston 16, and / or the valve disc 18 are positioned between an open position 20 (see Figure 1). Fig. 1) and a closed position 22 (cf. Fig. 2) Designed to be movable. In the open position 20, a fluid can flow through the valve 10 (the valve 10 is open). In the closed position 22, no fluid can flow through the valve 10 (the valve 10 is closed). The valve 10 includes a permanent magnet 24 for generating a magnetic force.

[0027] The valve 10 is arranged such that when the armature 14, the piston 16 and / or the valve disc 18 are in the closed position 22, the armature 14, the piston 16 and / or the valve disc 18 are held in the closed position 22 by means of the magnetic force of the permanent magnet 24.

[0028] The valve 10 can include a spring 26. The armature 14, the piston 16 and / or the valve disc 18 can be biased into the open position 20 by means of a spring force of the spring 26.

[0029] The permanent magnet 24 can be ring-shaped. The piston 16 can extend through an opening in the permanent magnet 24. In other words, the permanent magnet 24 can be arranged around the piston 16. The piston 16 can be movable relative to the permanent magnet 24. The permanent magnet 24 can be fixed in position within the valve 10.

[0030] The permanent magnet 24 can be arranged between the armature 14 and the valve disc 18.

[0031] The permanent magnet 24 and / or the spring 26 can be designed such that the magnetic force of the permanent magnet 24 acting on the armature 14 in the closed position 22 is greater than the spring force of the spring 26 acting on the armature 14 in the closed position 22.

[0032] The permanent magnet 24 can be designed such that the magnetic force of the permanent magnet 24 is insufficient to move the armature 14, the piston 16 and / or the valve disc 18 from the open position to the closed position 22.

[0033] The spring 26 can be designed such that the spring force of the spring 26 is insufficient to move the armature 14, the piston 16 and / or the valve disc 18 from the closed position 22 to the open position 20.

[0034] The following will be used as an example to illustrate the Fig. Figures 1 to 5 explain the operation of valve 10. Each figure shows a schematic sectional view of valve 10 and a corresponding state diagram 28 representing the respective state of valve 10. In state diagram 28, a current 30, an inlet 32, and an outlet 34 are plotted against time. The current 30 is the current energizing the coil 12. The inlet 32 ​​represents the flow of fluid into or to valve 10. The outlet 34 represents the outflow of fluid from valve 10. The respective state of valve 10 is represented in the corresponding state diagram 28 by a vertical line through the diagram.

[0035] In Fig. In position 1, the coil 12 is not energized. The armature 14, the piston 16, and the valve disc 18 are in the open position 20. The valve 10 is open. A fluid can be introduced into the valve 10 through an inlet opening 36. This is indicated by an arrow. Fig. The fluid introduced into valve 10 can be discharged from valve 10 through an outlet opening 38. This is indicated by an arrow pointing downwards. Fig. 1 indicated to the right (cf. current 30, inlet 32 ​​and outlet 34 in the depicted state diagram 28). The armature 14, the piston 16 and the valve disc 18 are pre-tensioned to the open position 20 by means of the spring 26.

[0036] In Fig. 2. The coil 12 is energized. An initial current is applied (see current 30, inlet 32 ​​and outlet 34 in the depicted state diagram 28). This generates a magnetic force which is applied to the armature 14 and moves it into Fig. 2 to the right. The anchor 14 moves the piston 16 and thus the valve disc 18 against the spring force of the spring 26. Fig. 2 to the right. The armature 14 is moved towards the permanent magnet 24. The armature 14, the piston 16 and the valve disc 18 are moved into the closed position 22 shown. The valve 10 is thus closed.

[0037] In Fig. 3. The current flow to coil 12 is terminated. The armature 14, the piston 16, and the valve disc 18 remain in the closed position 22. The magnetic force generated by the permanent magnet 24 acts on the armature 14 and holds it (and thus the piston 16 and the valve disc 18) in the closed position 22. The valve 10 is thus held closed by the magnetic force of the permanent magnet 24 (see current 30, inlet 32, and outlet 34 in the depicted state diagram 28).

[0038] In Fig. 4. The coil 12 is energized again. A second current is applied, with the second current having the opposite polarity to the first. In this case, the first current is positive and the second current is negative (see current 30, inlet 32 ​​and outlet 34 in the depicted state diagram 28). This generates a magnetic force that is smaller than the spring force of the spring 26 and causes it to Fig. 4 to the left. The piston 16 and the valve disc 18 are also moved, particularly due to the spring force of the spring 26. Fig. 4 moves to the left. The armature 14, the piston 16 and the valve disc 18 are moved into the open position 20 shown. The valve 10 is opened.

[0039] In Fig. At position 5, the coil 12 is re-energized. The armature 14, the piston 16, and the valve disc 18 remain in the open position 20. The spring force of the spring 26 acts on the piston 16, the valve disc 18, and the armature 14, holding them in the open position 20. The valve 10 is thus held open by the spring force of the spring 26 (see current 30, inlet 32, and outlet 34 in the illustrated state diagram 28). The in Fig. The state shown in section 5 corresponds to that in Fig. 1. State shown.

[0040] The following will be used as an example to illustrate the Fig. 1 to 5 describe a method for operating an electromagnetic valve 10 according to the above descriptions.

[0041] The electromagnetic valve 10 may be the one in the Fig. Valve 10, shown in steps 1 to 5, is involved. The procedure includes the following steps: Brief, especially pulsed, current flow to the coil 12 with a first current strength in order to move the armature 14, the piston 16 and / or the valve disc 18 from the open position 20 to the closed position 22.

[0042] The procedure may include the following steps: Brief, especially pulsed, current energizing the coil 12 with a second current strength to move the armature 14, the piston 16 and / or the valve disc 18 from the closed position 22 to the open position 20, wherein the second current strength has a polarity opposite to the first current strength.

[0043] The procedure may include the following steps: Holding the armature 14, the piston 16 and / or the valve disc 18 in the closed position 22 by means of the magnetic force of the permanent magnet 24.

Claims

[1] Electromagnetic valve (10), in particular for a cooling circuit of a motor vehicle, comprising: - an electromagnetic coil (12) for generating a magnetic force, - an armature (14) arranged inside the coil (12) and movable by means of the magnetic force of the coil (12), - a piston (16) that interacts with the armature (14), in particular arranged on the armature (14), - a valve disc (18) arranged on the piston (16), wherein the armature (14), the piston (16) and / or the valve disc (18) is movably configured between an open position (20), in which a fluid can flow through the valve (10), and a closed position (22), in which no fluid can flow through the valve (10), - a permanent magnet (24) to generate a magnetic force, - wherein the valve (10) is configured such that - that when the armature (14), the piston (16) and / or the valve disc (18) are in the closed position (22), the armature (14), the piston (16) and / or the valve disc (18) are held in the closed position (22) by means of the magnetic force of the permanent magnet (24). [2] Electromagnetic valve (10) according to claim 1, characterized by , that the valve (10) comprises a spring (26), wherein the armature (14), the piston (16) and / or the valve disc (18) are biased into the open position (20) by means of a spring force of the spring (26). [3] Electromagnetic valve (10) according to claim 1 or 2, characterized by , that the permanent magnet (24) is ring-shaped. [4] Electromagnetic valve (10) according to any one of the preceding claims, characterized by , that the permanent magnet (24) is arranged between the armature (14) and the valve disc (18). [5] Electromagnetic valve (10) according to any one of the preceding claims, characterized by , that the permanent magnet (24) and / or the spring (26) are designed such that the magnetic force of the permanent magnet (24) acting on the armature (14) in the closed position (22) is greater than the spring force of the spring (26) acting on the armature (14) in the closed position. [6] Electromagnetic valve (10) according to any one of the preceding claims, characterized by , that the permanent magnet (24) is designed such that the magnetic force of the permanent magnet (24) is insufficient to move the armature (14), the piston (16) and / or the valve disc (18) from the open position (20) to the closed position (22). [7] Electromagnetic valve (10) according to any one of claims 2 to 6, characterized by, that the spring (26) is designed such that the spring force of the spring (26) is insufficient to move the armature (14), the piston (16) and / or the valve disc (18) from the closed position (22) to the open position (20). [8] Method for operating an electromagnetic valve (10) according to any one of the preceding claims, characterized by the step: - Brief, especially pulsed, current flow to the coil (12) with a first current strength to move the armature (14), the piston (16) and / or the valve disc (18) from the open position (20) to the closed position (22). [9] Method according to claim 8, characterized by the step: - Brief, especially pulsed, current energizing the coil (12) with a second current to move the armature (14), the piston (16) and / or the valve disc (18) from the closed position (22) to the open position (20), wherein the second current has a polarity opposite to the first current. [10] Method according to claim 8 or 9, characterized by the step: - Holding the armature (14), piston (16) and / or valve disc (18) in the closed position (22) by means of the magnetic force of the permanent magnet (24).

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