Solenoid valve mechanism for driving dynamics system

Abstract

The present invention relates to a solenoid valve mechanism for a driving dynamics system, comprising a hydraulic block, a number of solenoid valves (10), each including a valve dome (11) and a magnetic assembly (12), and control electronics, in which each magnetic assembly (12) comprises a housing (13) and a winding support (14) arranged in the housing (13) and wound with a coil winding (15) connected to the control electronics via a connecting line (9), in which a free space (16) is formed between the housing (13) and the winding support (14) of each magnetic assembly (12), and a filling device (18) is fabricated to reduce the free space (16) and increase the coupling capacitance formed between the coil winding (15), the housing (13) and the valve dome (11), as well as to a driving dynamics system having such a solenoid valve mechanism.

Description

Technical Field

[0001] The present invention relates to a solenoid valve mechanism for a running dynamics system. A running dynamics system for a vehicle having such a solenoid valve mechanism is also an object of the present invention.

Background Art

[0002] In a running dynamics system that executes a running dynamics control function and / or a brake control function, a solenoid valve mechanism having a solenoid valve that controls the pressure of brake fluid for each wheel or brake circuit is used. For this purpose, a control signal is generated by control electronics and output to the solenoid valve of the solenoid valve mechanism. The solenoid valve is usually screwed or pushed into a hydraulic block that provides various hydraulic paths. Further, a sensor device including at least one pressure sensor and a drive device for a hydraulic pump may be connected to the hydraulic block. The control electronics generates unintentional parasitic electromagnetic noise, which is partially coupled in a wired manner from the control electronics to load parts such as a pump drive device, a solenoid valve, a sensor device, etc., where it may lead to an increase in the vehicle's EMC radiation (EMC: electromagnetic compatibility) via the connected brake pipes. The usual countermeasure is to low-impedance feedback such noise from the hydraulic block to the source, in this case the control electronics, so that such noise does not appear in the vehicle. This is usually solved by using mechanical contact, which has to be developed at high cost. For example, by using springs, contact tongues, and further screw joints or the contacts themselves to the solenoid valve, a low-impedance connection between the hydraulic block and the control electronics can be established, thereby feeding back the noise.

[0003] From Patent Document 1, housing assemblies with improved electromagnetic compatibility are known. For example, electrical modules of an electrified vehicle, such as battery packs and control modules, may include components such as a battery assembly, busbars, and an electric battery control module, and a housing assembly in which each component is contained. The housing assembly may include a polymer-based substrate and a metal film designed to improve the electromagnetic compatibility of the polymer-based substrate. Compression limiters may be positioned in the openings of the housing assembly and may be designed to establish an electrical path between the metal film and a separate metal component of the electrical module, such as a mounting member. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] German Patent Application Publication No. 102019133083A1 Specification [Overview of the Initiative]

[0005] A solenoid valve mechanism for a driving dynamics system having the constituent elements of independent claim 1, and a driving dynamics system for a vehicle having the constituent elements of claim 9, each have the advantage that at least one feedback path is created using a modified magnetic assembly, thereby reducing the overall impedance between the control electronics and the hydraulic block and improving the overall EMC (electromagnetic compatibility) of the solenoid valve mechanism and the corresponding driving dynamics system. The lower the impedance of this at least one feedback path between the hydraulic block and the control electronics, the more noise can be fed back and compensated from the hydraulic block to the control electronics.

[0006] Embodiments of the present invention provide a solenoid valve mechanism for a travel dynamics system, comprising a hydraulic block, a plurality of solenoid valves, each including a valve dome and a magnetic assembly, and control electronics. Each magnetic assembly includes a housing and a winding support located within the housing, around which a coil winding is wound, connected to the control electronics via a connecting circuit. A free space is formed between the housing and the winding support of each magnetic assembly. A filling device is fabricated to reduce this free space and increase the coupling capacitance formed between the coil winding, the housing, and the valve dome.

[0007] Furthermore, a vehicle driving dynamics system having such a solenoid valve mechanism is proposed.

[0008] For example, the solenoid valve mechanism according to the present invention can be used in driving dynamics control and / or brake control functions to reduce or eliminate EMC noise by feeding it back from the hydraulic block to the control electronics.

[0009] The coupling impedance of a solenoid valve is capacitive. This means that an increase in the coupling capacitance of the solenoid valve's magnetic assembly leads to a decrease in the solenoid valve's coupling impedance. Based on the signal frequency of noise from the control electronics, a coupling capacitance in picofaraday units (pF units) is already sufficient to reduce the coupling impedance of individual solenoid valves. Modern solenoid valve designs are optimized to increase the coupling capacitance between the coil winding and the housing, which consists of a magnetically and electrically conductive material, preferably a metal such as an iron alloy or steel, and the valve dome. The coupling capacitance of the magnetic assembly arises between the coil winding and the inner and outer casing or housing in which the coil winding is located.

[0010] In this context, control electronics can be understood as an electronic circuit comprising a circuit board and at least one electronic component for generating control signals and outputting them to the solenoid valves of the solenoid valve mechanism. Such control signals are typically provided as currents flowing through the coils of each solenoid valve, resulting in a magnetic force that moves the movable armature inside the valve dome of the solenoid valve.

[0011] In this context, a hydraulic block can be understood as a metal block, preferably made of aluminum, from which multiple hydraulic pathways or passages and connecting bores are drilled. Solenoid valves or sensors, such as pressure sensors or temperature sensors, or hydraulic piping can be screwed into or pushed into each housing bore. Furthermore, a drive unit for a fluid pump may be connected to the hydraulic block.

[0012] The strategies and variations described in the dependent claims allow for preferred improvements to the solenoid valve mechanism for the travel dynamics system described in independent claim 1.

[0013] It is particularly preferable that the increased coupling capacitance of the magnetic assembly of each individual solenoid valve can induce low-impedance feedback of noise signals from the hydraulic block to the control electronics, thereby creating multiple electrically parallel feedback paths between the hydraulic block and the control electronics. Since typical driving dynamics systems and / or brake control systems often have 8 to 12 solenoid valves, the overall coupling impedance corresponds to the feedback of the parallel circuit of the coupling impedances of all the solenoid valves. Consequently, 8 to 12 coupling capacitances are parasitic in the coil windings of the solenoid valves used. The overall coupling impedance, resulting from the parallel circuit of the coupling impedances of the solenoid valves, results in a combined coupling impedance of the feedback paths that is lower than that of a single spring joint, screw joint, clamp joint, or slip-on joint in conventional solenoid valve mechanisms.

[0014] In a preferred embodiment of the solenoid valve mechanism, the filling device may include a filling material having a predetermined dielectric constant much greater than 1. For example, an adhesive, silicone, or thermal conductive medium that can be inserted into free space as a liquid and cured can be used as the filling material.

[0015] In an alternative embodiment of the solenoid valve mechanism, the filling device may include a sleeve that can be inserted into the free space between the coil winding and the housing. This sleeve can be fitted, for example, after the completion of the process of winding the coil winding onto the winding support. The sleeve may preferably be made of a plastic material with a dielectric constant much greater than 1.

[0016] In another alternative embodiment of the solenoid valve mechanism, the winding structure of the coil winding can be modified. For example, an additional edge region of the coil winding can enlarge the overall cross-section of the coil winding and form a filler. This positions the winding very close to the housing in the edge region of the coil winding, thereby reducing the free space and significantly increasing the coupling capacitance. The additional edge region of the coil winding may have, for example, a trapezoidal or rectangular cross-section. Furthermore, for a further increase in coupling capacitance, in addition to the modification of the winding structure, a filler material having a predetermined dielectric constant much larger than 1 can be inserted into the remaining free space.

[0017] In embodiments of the solenoid valve mechanism according to the present invention, the coupling capacitance of individual solenoid valves is increased by design, for example, by filling the free space between the coil winding and the housing, or by modifying the winding structure of the coil winding so that the spacing is minimized and the winding is positioned very close to the housing in the edge region of the coil winding.

[0018] Embodiments of the present invention are shown in the drawings and will be described in detail below. In the drawings, the same reference numerals indicate components or members that perform the same or similar functions. [Brief explanation of the drawing]

[0019] [Figure 1] This is a schematic partial cross-sectional view showing an embodiment of the solenoid valve mechanism according to the present invention for a driving dynamics system. [Figure 2] Figure 1 is a schematic cross-sectional view showing a first embodiment of the magnetic assembly of the solenoid valve of the solenoid valve mechanism according to the present invention. [Figure 3] Figure 1 is a schematic cross-sectional view showing a second embodiment of the magnetic assembly of the solenoid valve of the solenoid valve mechanism according to the present invention. [Figure 4] Figure 1 is a schematic cross-sectional view showing a third embodiment of the magnetic assembly of the solenoid valve of the solenoid valve mechanism according to the present invention. [Modes for carrying out the invention]

[0020] As is evident from Figures 1 to 4, the illustrated embodiment of the solenoid valve mechanism 1 according to the present invention for a driving dynamics system includes a hydraulic block 3, a plurality of solenoid valves 10, 10A, 10B, 10C, each including a valve dome 11 and magnetic assemblies 12, 12A, 12B, 12C, and control electronics 8. Each magnetic assembly 12, 12A, 12B, 12C includes a housing 13 and a winding support 14 located within the housing 13, around which a coil winding 15 is wound, which is connected to the control electronics 8 via a connecting line 9. A free space 16 is formed between the housing 13 and the winding support 14 of each magnetic assembly 12, 12A, 12B, 12C. A filling device 18 reduces the free space 16 and increases the coupling capacitance formed between the coil winding 15 and the housing 13 and valve dome 11.

[0021] The solenoid valve mechanism 1 is preferably applied to execute a running dynamics control function and / or a brake control function in a running dynamics system. As is further apparent from FIG. 1, in the illustrated embodiment, the control electronics 8 includes a wiring board 8A and a plurality of electronic components 8B in order to generate a control signal and output it to the solenoid valves 10, 10A, 10B, 10C of the solenoid valve mechanism 1 via a connection line 9. In the illustrated embodiment, this control signal is provided as a current passing through the coil windings 15 of the respective solenoid valves 10, 10A, 10B, 10C, and provides a magnetic force that moves a movable armature (not shown in detail) inside the valve dome 11 of the solenoid valves 10, 10A, 10B, 10C.

[0022] As is further apparent from FIG. 1, a drive device 5 manufactured as an electric motor � for a fluid pump (not shown in detail) is connected to a hydraulic block 3. The electric motor 5A is connected to the control electronics 8 via a connection line 風. In the illustrated embodiment, the hydraulic block 3 is manufactured as an aluminum block in which a plurality of hydraulic paths or hydraulic passages and connection bores (not shown in detail) are drilled. The solenoid valves 10, 10A, 10B, 10C are pushed into the individual accommodation bores. Further, a hydraulic pipe 7 connecting, for example, a wheel brake (not shown in detail) to the fluid passage of the hydraulic block 3 is screwed into the hydraulic block 3.

[0023] As is further apparent from FIG. 1, in the illustrated partial view of the solenoid valve mechanism 1, the magnetic assemblies 12, 12A, 12B, 12C of the four solenoid valves 10, 10A, 10B, 10C are visible. Here, the increased coupling capacitance of the individual magnetic assemblies 12, 12A, 12B, 12C respectively causes a low - impedance feedback of a noise signal from the hydraulic block 3 to the control electronics 8, thereby creating a plurality of electrically parallel feedback paths between the hydraulic block 3 and the control electronics 8.

[0024] As is further apparent from FIG. 2, in the illustrated first embodiment of the magnetic assembly 12A for the solenoid valve 10A, the filling device 18 includes a filling material 18A having a predetermined dielectric constant much greater than 1. In the illustrated embodiment, the filling material 18A is a cured silicone that is inserted as a liquid into the free space 16 after the coil winding 15 is attached to the winding support and the winding support 14 is inserted into the hood-shaped housing 13 made of steel. The hood-shaped housing 13 has a central bushing that at least partially surrounds the valve dome 11. After the filling material 18A is inserted, the annular bottom surface is pushed into the open end of the housing 13. Then, the magnetic assembly is fitted or press-fitted into the valve dome 11.

[0025] In an alternative embodiment not shown, instead of silicone, an adhesive or a heat-conductive medium or other suitable material can be inserted into the free space 16 as the filling material 18A.

[0026] As is further apparent from FIG. 3, in the illustrated second embodiment of the magnetic assembly 12B for the solenoid valve 10B, the filling device 18 includes a sleeve 18B inserted into the free space 16 between the coil winding 15 and the housing 13. The sleeve 18B is made of a plastic material and has a dielectric constant much greater than 1.

[0027] As is further apparent from FIG. 4, in the illustrated third embodiment of the magnetic assembly 12C for the solenoid valve 10C, the filling device 18 includes a coil winding 15 having a modified winding structure. This coil winding 15 includes an additional edge region 18C that enlarges the entire cross-section of the coil winding 15 to form the filling device 18. As is further apparent from FIG. 4, in the illustrated embodiment, the additional edge region 18C of the coil winding 15 has a trapezoidal cross-section illustrated by a dashed line. As is further apparent from FIG. 4, the additional edge region 18C of the coil winding 15 at least partially protrudes from the winding support 14 and reduces the free space 16 between the coil winding 15 and the housing 13.

[0028] In an alternative embodiment of the magnetic assembly 12 (not shown), the additional edge region 18C has a rectangular cross-section. [Explanation of symbols]

[0029] 1. Solenoid valve mechanism 3 Hydraulic Blocks 8 Control Electronics 9 Connection lines 10 Solenoid valve 11 Valve Dome 12 Magnetic Assembly 13 Housing 14 Winding support 15 Coil winding 16 Free space 18 Filling equipment 18A filling material 18B Sleeve 18C Edge area

Claims

1. A solenoid valve mechanism (1) for a driving dynamics system, comprising a hydraulic block (3), a plurality of solenoid valves (10) each including a valve dome (11) and a magnetic assembly (12), and control electronics (8), wherein each magnetic assembly (12) each includes a housing (13) and a winding support (14) disposed within the housing (13) around which a coil winding (15) connected to the control electronics (8) via a connecting line (9), and a free space (16) is formed between the housing (13) and the winding support (14) of each magnetic assembly (12), and a filling device (18) is manufactured to reduce the free space (16) and increase the coupling capacitance formed between the coil winding (15), the housing (13), and the valve dome (11). Solenoid valve mechanism (1), wherein the increased coupling capacitance of each of the magnetic assemblies (12) induces low-impedance feedback of noise signals from the hydraulic block (3) to the control electronics (8), thereby creating multiple electrically parallel feedback paths between the hydraulic block (3) and the control electronics (8).

2. The solenoid valve mechanism (1) according to claim 1, characterized in that the filling device (18) includes a filling material (18A) having a predetermined dielectric constant much larger than 1.

3. The solenoid valve mechanism (1) according to claim 2, characterized in that the filling material (18A) is an adhesive, silicone, or thermal conductive medium that can be inserted into the free space (16) as a liquid and cured.

4. The solenoid valve mechanism (1) according to claim 1, characterized in that the filling device (18) includes a sleeve (18B) inserted into the free space (16) between the coil winding (15) and the housing (13).

5. The solenoid valve mechanism (1) according to claim 4, characterized in that the sleeve (18B) is made of a plastic material with a dielectric constant much greater than 1.

6. The solenoid valve mechanism (1) according to claim 1 or 2, characterized in that an additional edge area (18C) enlarges the overall cross-section of the coil winding (15) to form the filling device (18).

7. The solenoid valve mechanism (1) according to claim 6, characterized in that the additional edge region (18C) of the coil winding (15) has a trapezoidal or rectangular cross-section.

8. A driving dynamics system for a vehicle, comprising the solenoid valve mechanism (1) according to claim 1 or 2.

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