Three-way solenoid valve

Abstract

This application provides a three-way solenoid valve, comprising: a valve block including a valve chamber and a first port, a second port, and a third port in fluid communication with the valve chamber; an armature; a valve body; a plunger; and a flow path control assembly disposed inside the second valve body and including a first on / off flow path and a second on / off flow path. The first on / off flow path allows the first port and the second port to be fluidly connected to or blocked from each other depending on the magnitude of the force applied by the plunger, and the second on / off flow path allows the second port and the third port to be fluidly connected to or blocked from each other depending on the magnitude of the force applied by the plunger. This three-way solenoid valve reduces the manufacturing cost and size of hydraulic braking devices.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2021-0134333, filed on October 8, 2021, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a three-way solenoid valve. Background Technology

[0004] The content described in this section is only to provide background information for this disclosure and does not constitute related technology.

[0005] A normally open solenoid valve is one whose flow path is open even when no power is applied. A normally closed solenoid valve is one whose flow path is closed when no power is applied. A vehicle's hydraulic braking system selectively transmits working fluid to multiple wheel braking mechanisms by controlling the opening and closing states of multiple solenoid valves.

[0006] Figure 1 This is a schematic block diagram showing the hydraulic circuit of a vehicle braking system according to related technology. (Refer to...) Figure 1 Working fluid is supplied from braking device 1 to inlet valve 3 and outlet valve 5. Inlet valve 3 is a normally open solenoid valve, and outlet valve 5 is a normally closed solenoid valve. Check valve 4 is installed in inlet valve 3, allowing working fluid to flow only from the wheel cylinder to braking device 1. When the hydraulic pressure supplied from the wheel cylinder decreases, outlet valve 5 opens to discharge the working fluid from the wheel cylinder to braking device 1. The normally open inlet valve 3, normally closed outlet valve 5, and check valve 4 are installed in the vehicle's hydraulic braking device. Because this hydraulic braking device includes multiple solenoid valves, it is costly to manufacture and has a large size.

[0007] To address the aforementioned issues, a three-way solenoid valve designed to perform all the functions of an inlet valve, outlet valve, and check valve has been proposed. The three-way solenoid valve has a single valve body with three flow paths along its longitudinal direction. Therefore, compared to conventional hydraulic braking devices, hydraulic braking devices incorporating a three-way solenoid valve offer advantages such as lower manufacturing costs and smaller size.

[0008] However, hydraulic braking devices, including three-way solenoid valves, still suffer from problems such as long length and complex shape. Summary of the Invention

[0009] According to one embodiment, a three-way solenoid valve is used as both an inlet valve and an outlet valve, thereby reducing the manufacturing cost and size of the hydraulic braking device.

[0010] According to one embodiment, the three-way solenoid valve includes two valve bodies, thereby reducing the manufacturing cost and size of the hydraulic braking device.

[0011] The aspects of this disclosure are not limited to those described above, and other aspects not described will be clearly understood by those skilled in the art from the following description. Attached Figure Description

[0012] The above and other objects, features, and advantages of this disclosure will become more apparent to those skilled in the art from the detailed description of exemplary embodiments of this disclosure with reference to the accompanying drawings, wherein:

[0013] Figure 1 This is a schematic block diagram showing the hydraulic circuit of a vehicle braking system according to related technologies.

[0014] Figure 2 This is a cross-sectional view of a three-way solenoid valve according to a first embodiment of the present disclosure.

[0015] Figure 3 This is a cross-sectional view used to illustrate fluid flow when no electromagnetic force is formed in the armature of a three-way solenoid valve according to a first embodiment of the present disclosure.

[0016] Figure 4 This is a cross-sectional view used to illustrate fluid flow when a second electromagnetic force is formed in the armature of a three-way solenoid valve according to a first embodiment of the present disclosure.

[0017] Figure 5 This is a cross-sectional view used to illustrate the fluid flow when a third electromagnetic force is formed in the armature of a three-way solenoid valve according to a first embodiment of the present disclosure.

[0018] Figure 6 This is a cross-sectional view used to illustrate the fluid flow when a first electromagnetic force is formed in the armature of a three-way solenoid valve according to a first embodiment of the present disclosure.

[0019] Figure 7 This is a cross-sectional view of a three-way solenoid valve according to a second embodiment of the present disclosure.

[0020] Figure 8 This is a cross-sectional view used to illustrate fluid flow when no electromagnetic force is formed in the armature of a three-way solenoid valve according to a second embodiment of the present disclosure.

[0021] Figure 9 This is a cross-sectional view used to illustrate fluid flow when a second electromagnetic force is formed in the armature of a three-way solenoid valve according to a second embodiment of the present disclosure.

[0022] Figure 10 This is a cross-sectional view used to illustrate the fluid flow when a third electromagnetic force is formed in the armature of a three-way solenoid valve according to a second embodiment of the present disclosure.

[0023] Figure 11This is a cross-sectional view used to illustrate the fluid flow when a first electromagnetic force is formed in the armature of a three-way solenoid valve according to a second embodiment of the present disclosure.

[0024] Figure 12 This is a schematic block diagram illustrating a hydraulic circuit including a three-way solenoid valve according to an embodiment of the present disclosure. Detailed Implementation

[0025] In this disclosure, terms such as “upper side” or “lower side” are used with reference to the accompanying drawings.

[0026] Figure 2 This is a cross-sectional view of a three-way solenoid valve according to a first embodiment of the present disclosure. In this disclosure, the longitudinal direction of the three-way solenoid valve is referred to as the Y-axis direction. In the directions shown in the figure, the upward direction is referred to as the "positive Y-direction," and the downward direction is referred to as the "negative Y-direction."

[0027] Reference Figure 2 According to the first embodiment, the three-way solenoid valve 100 includes an armature 110, a plunger 120, a valve body 130, a sealing member 140, a flow path control assembly 150, a check valve 170, and a valve block 180.

[0028] Armature 110 is configured to generate an electromagnetic force. A coil may be configured to surround the outer circumferential surface of armature 110, and armature 110 may generate an electromagnetic force corresponding to the current applied to the coil. The electromagnetic force generated by armature 110 acts on armature 110 to move armature 110 toward first valve body 131. As the electromagnetic force generated in armature 110 increases, armature 110 and first valve body 131 move closer to each other. Hereinafter, the electromagnetic force generated by armature 110 is simply referred to as "electromagnetic force".

[0029] Valve body 130 includes a first valve body 131 and a second valve body 132. The first valve body 131 is configured such that one side faces the armature 110 and has a hollow portion therein. The second valve body 132 is configured such that one side faces the other side of the first valve body 131 and has a hollow portion therein. A plunger 120 can slide within the hollow portion of valve body 130 and move linearly in the Y-axis direction. A groove formed in the lower end of the first valve body 131 and the upper surface of the second valve body 132 can form the peripheral surface of a flow path connecting the first port A, the second port B, or the third port C to the hollow portion inside the second valve body 132. In this disclosure, the flow path connecting the first port A, the second port B, or the third port C to the hollow portion inside the second valve body 132 is referred to as a discharge flow path 133. In contrast, the groove formed in the upper end of the second valve body 132 and the lower surface of the second valve body 132 can be configured to connect the first port A, the second port B, or the third port C, as well as the hollow portion inside the second valve body 132. A recessed portion is formed in the lower surface of the first valve body 131, and at least a portion of the second valve body 132 is accommodated within the recessed portion. The three-way solenoid valve 100 has a shorter length and a simpler shape than a typical three-way solenoid valve, thereby reducing the size of the braking device and lowering manufacturing costs. A flange portion is formed in the lower end of the first valve body 131. By fixing the flange portion to a hole formed in the valve block 180, the three-way solenoid valve 100 can be securely fixed to the valve block 180.

[0030] At least a portion of plunger 120 is configured to pass through a hollow portion inside the first valve body 131 and a hollow portion inside the second valve body 132. One end of plunger 120 faces armature 110. Plunger 120 and armature 110 may share their centerline and have a cylindrical shape, and plunger 120 may be configured to contact the lower surface of armature 110. The other end of plunger 120 faces flow path control assembly 150. Flow path control assembly 150 may include a first fluid control unit 151 that opens or closes a first open / close flow path P1, and the lower surface of plunger 120 may be configured to face the first fluid control unit 151. Plunger 120 is configured such that one end of it is compressed and moved by armature 110. When armature 110 moves toward the first valve body 131 by electromagnetic force, plunger 120 is compressed in the negative Y direction. When plunger 120 is compressed in the negative Y direction, the first fluid control unit 151 is compressed in the negative Y direction. In the following text, the force by which the plunger 120 compresses the first fluid control unit 151 is referred to as the compressing force.

[0031] The lower end of the plunger 120 can be configured to pass through a portion of the flow path control assembly 150. A first elastic member 154 is disposed inside the flow path control assembly 150. Due to this configuration, when the armature 110 compresses the plunger 120, the plunger 120 can compress the first elastic member 154. The plunger 120 applies a compressive force to the first elastic member 154 corresponding to the electromagnetic force generated by the armature 110. The cross-sectional area of ​​the lower portion of the plunger 120 can be formed to be smaller than the cross-sectional area of ​​the upper portion of the plunger 120, such that the plunger 120 passes through a portion of the flow path control assembly 150. Here, the cross-sectional area refers to the cross-sectional area of ​​a plane perpendicular to the Y-axis.

[0032] A sealing member 140 is disposed between the flow path control assembly 150 and the second valve body 132. The sealing member 140 is pressed against the outer circumferential surface of the upper housing 152 and the inner circumferential surface of the second valve body 132 to prevent fluid from flowing between the flow path control assembly 150 and the second valve body 132. Fluid can only move through the space formed inside the flow path control assembly 150.

[0033] The flow path control assembly 150 is disposed inside the second valve body 132. The flow path control assembly 150 includes all or part of the first fluid control unit 151, housings 152 and 153, first elastic member 154, second fluid control unit 155, and valve seat 156.

[0034] The flow path control assembly 150 includes a first open / close flow path P1, which is configured to allow a first port A and a second port B to be fluidly connected to or blocked from each other depending on the magnitude of the electromagnetic force. The first open / close flow path P1 may be the space between the opening of the upper housing 152 and the first fluid control unit 151.

[0035] The flow path control assembly 150 includes a second open / close flow path P2, which is configured to prevent or supply fluid flow between the second port B and the third port C based on the magnitude of the electromagnetic force. The second open / close flow path P2 may be the space between the hollow portion of the valve seat 156 and the second fluid control unit 155.

[0036] The flow path control assembly 150 is configured to control the opening or closing of a first open / close flow path P1 and a second open / close flow path P2 based on the magnitude of the electromagnetic force. A first fluid control unit 151 opens or closes the first open / close flow path P1 based on the magnitude of the pressing force. The first fluid control unit 151 is disposed inside the flow path control assembly 150 to contact the lower end of the plunger 120 and the upper end of the first elastic member 154. When the plunger 120 is pressed by the armature 110, the first fluid control unit 151, which is in contact with the lower end of the plunger 120, is pressed by the plunger 120 in the negative Y direction. When the plunger 120 presses the first fluid control unit 151 with sufficient force, the first fluid control unit 151 moves toward the first elastic member 154, thereby opening the first open / close flow path P1. Figure 2 As shown, the first fluid control unit 151 may be formed in a spherical shape, but this disclosure is not limited thereto. The first fluid control unit 151 is provided inside the housings 152 and 153, which is sufficient to close the first open / close flow path P1.

[0037] The sides of housings 152 and 153 are fixed inside the valve chamber D, and housings 152 and 153 move linearly along the Y-axis. Fluid outside housings 152 and 153 can flow into through-holes inside housings 152 and 153 through orifices formed in housings 152 and 153. Openings are formed in the upper part of housings 152 and 153, allowing a portion of plunger 120 to pass through the openings. Housings 152 and 153 may include, for example... Figure 2 The upper housing 152 and lower housing 153 are shown, but they can be formed integrally.

[0038] A first elastic member 154 may be disposed inside housings 152 and 153 and has one end in contact with the first fluid control unit 151 and another end in contact with the lower surfaces of housings 152 and 153. The first elastic member 154 can provide elastic force to the first fluid control unit 151 and the lower housing 153. The magnitude of the elastic force of the first elastic member 154 corresponds to the magnitude of the compressive force. When the first elastic member 154 is compressed by the first fluid control unit 151 along the negative Y direction, housings 152 and 153 are compressed along the negative Y direction.

[0039] The second fluid control unit 155 may be disposed at the lower end of the exterior of housings 152 and 153. A valve seat 156 is disposed at the lower end of the second fluid control unit 155. A hollow portion through which fluid flows is formed in the center of the valve seat 156. As the second fluid control unit 155 moves from the upper end of the valve seat 156 along the Y-axis, the second open / close flow path P2 opens or closes.

[0040] According to one embodiment of the present disclosure, a three-way solenoid valve 100 includes a check valve 170 that allows fluid to flow in only one direction. Specifically, the check valve 170 allows fluid to flow only from a second port B to a third port C. The check valve 170 may be disposed in the lower portion of the three-way solenoid valve 100.

[0041] Figure 12 This is a schematic block diagram illustrating a hydraulic circuit including a three-way solenoid valve according to an embodiment of the present disclosure.

[0042] Valve block 180 includes valve chamber D, first port A, second port B, and third port C. First port A, second port B, and third port C are in fluid communication with valve chamber D. (Refer to...) Figure 12 The braking device 1000 may include an accumulator (not shown), a storage tank (not shown), and a booster (not shown). Here, the first port A may be an inlet or outlet of a flow path connected to the accumulator or storage tank. When the hydraulic pressure in wheel cylinders W1, W2, W3, or W4 decreases, fluid flows from the second port B to the first port A.

[0043] The second port B can be an inlet or outlet connected to the flow path of wheel cylinders W1, W2, W3, or W4 installed on the vehicle wheels.

[0044] The third port C can be an inlet or outlet connected to the flow path of the supercharger. Typically, when the hydraulic pressure in wheel cylinders W1, W2, W3, or W4 increases, fluid flows from the third port C to the second port B. Here, the supercharger can be a master cylinder or an electric pump.

[0045] like Figure 2 As shown, the first port A and the second port B can be formed on the side surface of the three-way solenoid valve 100. The third port C can be formed at the lower part of the three-way solenoid valve 100. However, the first to third ports A, B and C of this disclosure are not limited to the above configuration and connection relationship. Fluid flowing into a portion of the first to third ports A, B and C flows into another portion of the first to third ports A, B and C via the valve chamber D.

[0046] exist Figure 2 In this context, the area surrounded by the sealing member 140 is referred to as the first region X1. The cross-sectional area of ​​the first open / close flow path P1 sealed by the first fluid control unit 151 is referred to as the second region X2. The cross-sectional area of ​​the second open / close flow path P2 sealed by the second fluid control unit 155 is referred to as the third region X3.

[0047] Armature 110 is configured to generate a first electromagnetic force, a second electromagnetic force greater than the first electromagnetic force, and a third electromagnetic force greater than the second electromagnetic force. By adjusting the magnitude of the electromagnetic forces generated in armature 110, the opening / closing states of the first opening / closing flow path P1 and the second opening / closing flow path P2 are adjusted according to the electromagnetic forces generated in armature 110. Here, the first to third electromagnetic forces have preset values, which can be obtained experimentally and stored in the controller's memory in the form of a lock-uptable (LUT). The first to third electromagnetic forces can have values ​​determined within a predetermined range. The second electromagnetic force is greater than the first electromagnetic force, and the third electromagnetic force is greater than the second electromagnetic force.

[0048] In the following text, Figures 3 to 6 In the description, the first port A is defined as the port directly / indirectly connected to the accumulator or storage device, the second port B is defined as the port directly / indirectly connected to the wheel cylinders W1, W2, W3 or W4, and the third port C is defined as the port directly / indirectly connected to the turbocharger.

[0049] Reference Figure 3 When no electromagnetic force is generated in the armature 110, the armature 110 does not compress the plunger 120. When the armature 110 does not compress the plunger 120, the first open / close flow path P1 can be opened due to the pressure difference between the second port B and the third port C and the first port A. Specifically, when no electromagnetic force is generated in the armature 110, the armature 110 does not move towards the first valve body 131. Therefore, the plunger 120 does not compress the flow path control assembly 150. In this case, the elastic force of the first elastic member 154 presses the first fluid control unit 151 upward to close the first open / close flow path P1.

[0050] The fluid flowing into the second port B and the third port C compresses the first region X1 along the positive Y direction to open the second open / close flow path P2. The fluid compressed into the intensifier passes sequentially through the second open / close flow path P2 and the second port B, and is delivered to cylinders W1, W2, W3, and W4. When the pressure in the intensifier is released, the second open / close flow path P2 opens, and the fluid flows from the second port B to the third port C, thereby reducing the pressure in cylinders W1, W2, W3, and W4. As the fluid flows from the second port B to the third port C, it can also flow through the check valve 170.

[0051] Typically, in a vehicle's braking system, the inlet valve is normally open, meaning the flow path is open even when no power is applied, while the outlet valve is normally closed, meaning the flow path is closed when no power is applied.

[0052] In the three-way solenoid valve 100 according to the first embodiment of this disclosure, when not energized, the second open / close flow path P2 between the second port B and the third port C is open, and the first open / close flow path P2 between the first port A and the second port B is closed. The three-way solenoid valve 100 according to the first embodiment of this disclosure serves as a normally open inlet valve and a normally closed outlet valve according to related technologies. The check valve 170 allows fluid to flow only from the second port B to the third port C, and alternatively serves as a check valve provided in the inlet valve according to related technologies.

[0053] Reference Figure 4 When the armature 110 compresses the plunger 120 using the second electromagnetic force, the first open / close flow path P1 and the second open / close flow path P2 are closed. The armature 110 compresses the plunger 120 using a force corresponding to the second electromagnetic force. Here, the force corresponding to the second electromagnetic force can have the same magnitude as the second electromagnetic force. The second electromagnetic force is set to be greater than the sum of the force exerted on the flow path control assembly 150 by the fluid flowing into the third port C and the force exerted on the flow path control assembly 150 by the fluid flowing into the second port B. Here, the force exerted on the flow path control assembly 150 by the fluid flowing into the third port C is caused by the pressure exerted on the third region X3 by the fluid flowing into the third port C. The force exerted on the flow path control assembly 150 by the fluid flowing into the second port B is caused by the pressure exerted on the first region X1 by the fluid flowing into the second port B and the pressure exerted on the third region X3 by the fluid flowing into the second port B. Furthermore, the second electromagnetic force is set to be less than the force obtained by adding the force exerted on the second region X2 by the fluid flowing into the second port B and the elastic force of the first elastic member 154.

[0054] The armature 110, which has a second electromagnetic force, indirectly compresses the second fluid control unit 155 to close the second open / close flow path P2. The force exerted by the armature 110 on the first elastic member 154 is insufficient to deform the first elastic member 154, thus closing the first open / close flow path P1 as well. Here, the indirect compression by the armature 110 means that, due to the electromagnetic force of the armature 110, the plunger 120 moves in the negative Y direction, and the plunger 120 compresses the structure of the flow path control assembly 150. When the second electromagnetic force is applied to the armature 110, the gap between the armature 110 and the first valve body 131 decreases.

[0055] When the second electromagnetic force is generated in the armature 110, the second open / close flow path P2 closes, so the hydraulic pressure generated in the supercharger is not transmitted to wheel cylinders W1, W2, W3, or W4. Since the first open / close flow path P1 is also closed, fluid from wheel cylinders W1, W2, W3, and W4 is not supplied to the accumulator. Therefore, when the second electromagnetic force is generated in the armature 110, the hydraulic pressure inside wheel cylinders W1, W2, W3, or W4 is maintained. Figure 4 The flow path connection shown corresponds to the flow path connection in a typical vehicle braking system when both the inlet and outlet valves are closed. To maintain the braking pressure generated by wheel cylinders W1, W2, W3, or W4, the three-way solenoid valve 100 can be used as follows: Figure 4 As shown, it is driven.

[0056] Reference Figure 5 Armature 110 uses a third electromagnetic force to compress plunger 120, opening the first open / close flow path P1 and closing the second open / close flow path P2. The third electromagnetic force is set to be greater than the sum of the force exerted on the second region X2 by the fluid flowing into the second port B and the elastic force of the first elastic member 154. The armature 110, with the third electromagnetic force, indirectly compresses the second fluid control unit 155 to close the second open / close flow path P2. Furthermore, the armature 110 indirectly compresses the first elastic member 154 to compress it. As the first elastic member 154 is compressed, the first open / close flow path P1 opens.

[0057] When a third electromagnetic force is generated in the armature 110, the second open / close flow path P2 closes, so the hydraulic pressure generated in the intensifier is not transmitted to cylinders W1, W2, W3, or W4. Since the first open / close flow path P1 is open, the fluid inside cylinders W1, W2, W3, or W4 passes sequentially through the second port B and the first port A and is delivered to the accumulator or storage device. Therefore, when the third electromagnetic force is generated in the armature 110, the hydraulic pressure inside cylinders W1, W2, W3, or W4 decreases. Figure 5 The flow path connection shown corresponds to the flow path connection in a typical vehicle braking system when the inlet valve is closed and the outlet valve is open. To reduce the braking pressure supplied to wheel cylinders W1, W2, W3, or W4, it can be done as follows: Figure 5 The three-way solenoid valve 100 is shown.

[0058] Reference Figure 6When the armature 110 compresses the plunger 120 using the first electromagnetic force, the first open / close flow path P1 closes, while the second open / close flow path P2 opens. The armature 110 compresses the plunger 120 using a force corresponding to the first electromagnetic force. The first electromagnetic force is less than the second electromagnetic force. The first open / close flow path P1 is closed. The force by which the armature 110 indirectly compresses the second fluid control unit 155 is less than the force exerted on the second fluid control unit 155 by the fluid flowing into the third port C. Therefore, the second open / close flow path P2 is partially open, and fluid flows from the third port C to the second port B. When the first electromagnetic force is generated in the armature 110, the second open / close flow path P2 is partially open, so that the fluid compressed by the booster passes sequentially through the third port C and the second port B and is delivered to the wheel cylinders W1, W2, W3, or W4. Because the first open / close flow path P1 is closed, the hydraulic pressure inside the wheel cylinders W1, W2, W3, and W4 is not transmitted to the accumulator. Therefore, when the first electromagnetic force is a coil, the hydraulic pressure in wheel cylinders W1, W2, W3, or W4 increases. Figure 6 The flow path connection shown corresponds to the flow path connection in a typical vehicle braking system when the inlet valve is open and the outlet valve is closed. To increase the hydraulic pressure in wheel cylinders W1, W2, W3, or W4, it can be done as follows: Figure 6 The three-way solenoid valve 100 is shown.

[0059] When the three-way solenoid valve 100 is Figure 6 When driven as shown, the pressure in wheel cylinders W1, W2, W3, or W4 increases sharply, which may cause wheel slippage or wheel lock-up. To prevent wheel slippage or wheel lock-up, a first electromagnetic force corresponding to the force before opening the first opening / closing flow path P1 is formed in the armature 110. After this, the first electromagnetic force decreases linearly to partially open the second opening / closing flow path P2.

[0060] In a three-way solenoid valve 100 according to one embodiment of the present disclosure, the amount of fluid flowing between the first to third ports A, B and C changes as the current applied to the coil changes continuously.

[0061] Figure 7 This is a cross-sectional view of a three-way solenoid valve according to a second embodiment of the present disclosure.

[0062] Reference Figure 7 According to the second embodiment, the three-way solenoid valve 200 includes an armature 110, a plunger 120, a valve body 130, a sealing member 140, a flow path control assembly 150, a second elastic member 210, a check valve 170, and a valve block 180.

[0063] The difference between the three-way solenoid valve 200 according to the second embodiment and the solenoid valve 100 according to the first embodiment lies in the shape of the housings 152 and 153. Apart from this, the construction and actuation mechanism of the three-way solenoid valve 200 according to the second embodiment are substantially the same as those of the three-way solenoid valve 100 according to the first embodiment. Therefore, repeated descriptions will be omitted.

[0064] The second elastic member 210 may be disposed inside the valve chamber D. One end of the second elastic member 210 contacts the upper surface of the valve seat 156 and applies elastic force to the housings 152 and 153 in the positive Y direction. The second elastic member 210 may be configured to surround at least a portion of the flow path control assembly 150. The second elastic member 210 may be a spring. The elastic modulus of the second elastic member 210 may be lower than that of the first elastic member 154. The directions of the elastic force provided by the first elastic member 154 and the directions of the elastic force provided by the second elastic member 210 may be parallel to each other. The first elastic member 154 may be disposed inside the flow path control assembly 150, and the second elastic member 210 may be configured to surround the peripheral surface of the flow path control assembly 150. The second elastic member 210 is not necessarily included only in the three-way solenoid valve 200 according to the second embodiment, but may also be included in the three-way solenoid valve 100 according to the first embodiment. For example, in the three-way solenoid valve 100 according to the first embodiment, the second elastic member 210 may be configured such that one side of it contacts the housings 152 and 153 and the other side of it contacts the valve seat 156.

[0065] In the following text, Figures 8 to 11 In the description, the first port A refers to the port directly or indirectly connected to the accumulator or storage device (not shown). The second port B refers to the port directly or indirectly connected to wheel cylinders W1, W2, W3, or W4. The third port C refers to the port directly or indirectly connected to the supercharger.

[0066] Reference Figure 8 When no electromagnetic force is generated in the armature 110, the armature 110 does not compress the plunger 120.

[0067] According to the second embodiment, the upper end of the lower housing 153 is bent in the radial direction of the housing. Due to the shape of the lower housing 153, the durability of the plunger 120 in the armature 110 can be improved. When the second open / close flow path P2 is opened, the lower housing 153 moves in the positive Y direction. According to the first embodiment, the lower housing 153 compresses the plunger 120 while moving in the positive Y direction. In contrast, the upper surface bent at the upper end of the lower housing 153 according to the second embodiment is held in place by a portion of the second valve body 132, thereby securing the flow path control assembly 150. Therefore, when no electromagnetic force is generated in the armature 110, there is no force for compressing the plunger 120, thereby improving the durability of the plunger 120.

[0068] In the three-way solenoid valve 200 according to the second embodiment of the present disclosure, when no current is applied to the coil, the second opening / closing flow path P2 is open, while the first opening / closing flow path P1 is closed. Therefore, the three-way solenoid valve 200 according to the second embodiment of the present disclosure is used as a normally open inlet valve and a normally closed outlet valve according to the related art.

[0069] Reference Figure 9 The armature 110 uses a force corresponding to the second electromagnetic force to compress the plunger 120. Here, the second electromagnetic force is set to be greater than the sum of the force exerted on the flow path control assembly 150 by the fluid flowing into the third port C and the force exerted on the flow path control assembly 150 by the fluid flowing into the second port B. The force exerted on the flow path control assembly 150 by the fluid flowing into the third port C is caused by the pressure exerted on the third region X3 by the fluid flowing into the third port C. The force exerted on the flow path control assembly 150 by the fluid flowing into the second port B is caused by the pressure exerted on the first region X1 by the fluid flowing into the second port B and the pressure exerted on the third region X3. Furthermore, the second electromagnetic force is set to be less than the force obtained by adding the force exerted on the second region X2 by the fluid flowing into the second port B and the elastic force of the first elastic member 154. The armature 110, in which the second electromagnetic force is formed, indirectly compresses the second fluid control unit 155 to close the second open / close flow path P2. The force exerted by the armature 110, which forms the second electromagnetic force, on the first elastic member 154 is insufficient to deform the first elastic member 154, so the first open / close flow path P1 is also closed.

[0070] When the second electromagnetic force is generated in the armature 110, the second open / close flow path P2 closes, so the fluid compressed in the supercharger is not delivered to the cylinders W1, W2, W3, or W4. Because the first open / close flow path P1 is closed, the fluid inside the cylinders W1, W2, W3, and W4 is not delivered to the accumulator. Therefore, when the second electromagnetic force is generated in the armature 110, the hydraulic pressure inside the cylinders W1, W2, W3, or W4 is maintained. Figure 9 The flow path connection shown corresponds to the flow path connection in a typical vehicle braking system when both the inlet and outlet valves are closed. To maintain the braking pressure of wheel cylinders W1, W2, W3, or W4, it can be configured as follows: Figure 9 The diagram shows the driving three-way solenoid valve 200.

[0071] Reference Figure 10 Armature 110 compresses plunger 120 using a force corresponding to a third electromagnetic force. This third electromagnetic force is set to be greater than the sum of the force exerted on second region X2 by the fluid flowing into second port B and the elastic force of first elastic member 154. Armature 110, with the third electromagnetic force, indirectly compresses second fluid control unit 155 to close second open / close flow path P2. When armature 110 indirectly compresses first elastic member 154, first open / close flow path P1 opens. When the third electromagnetic force is formed in armature 110, second open / close flow path P2 closes, so the fluid compressed in the booster is not delivered to cylinders W1, W2, W3, or W4. Because first open / close flow path P1 is open, fluid inside cylinders W1, W2, W3, or W4 passes sequentially through second port B and first port A and is delivered to accumulator or storage. Therefore, when a third electromagnetic force is generated in the armature 110, the hydraulic pressure inside the wheel cylinders W1, W2, W3 or W4 decreases. Figure 10 The flow path connection shown corresponds to the flow path connection in a typical vehicle braking system when the inlet valve is closed and the outlet valve is open. To reduce the braking pressure of wheel cylinders W1, W2, W3, or W4, it can be done as follows: Figure 5 The diagram shows the driving three-way solenoid valve 200.

[0072] Reference Figure 11 Armature 110 compresses plunger 120 using a force corresponding to the first electromagnetic force. The first electromagnetic force can be set to be less than the second electromagnetic force. The force exerted by armature 110, which generates the first electromagnetic force, on the second fluid control unit 155 is less than the force exerted on the second fluid control unit 155 by the fluid flowing into the third port C. Therefore, the second open / close flow path P2 is not completely closed, and fluid flows from the third port C to the second port B. The first open / close flow path P1 is closed. When the first electromagnetic force is generated in armature 110, the second open / close flow path P2 is partially open, so the fluid compressed by the booster is sequentially transferred to wheel cylinders W1, W2, W3, or W4 through the third port C and the second port B. Because the first open / close flow path P1 is closed, the fluid inside wheel cylinders W1, W2, W3, and W4 is not delivered from the second port B to the accumulator or storage unit via the first port A. Therefore, when the first electromagnetic force is generated in armature 110, the hydraulic pressure inside wheel cylinders W1, W2, W3, or W4 increases. Figure 11 The flow path connection shown corresponds to the flow path connection state in a typical vehicle braking system when the inlet valve is open and the outlet valve is closed. To increase the braking pressure of wheel cylinders W1, W2, W3, or W4, it can be done as follows: Figure 11 The diagram shows the driving three-way solenoid valve 200.

[0073] When the three-way solenoid valve 200 is Figure 11 When driven as shown, the pressure in wheel cylinders W1, W2, W3, or W4 increases sharply, which may cause wheel slippage or wheel lockup. To prevent wheel slippage or wheel lockup, a first electromagnetic force corresponding to the force before opening the first open / close flow path P1 is formed in the armature 110. After this, the first electromagnetic force decreases linearly to gradually increase the hydraulic pressure in wheel cylinders W1, W2, W3, or W4.

[0074] According to one embodiment, by estimating the clamping force based on the position of the piston that detects a specific current value, the electric brake has the effect of estimating the clamping force with high precision.

[0075] According to one embodiment, by taking into account the hysteresis characteristics of the braking force relative to the piston position when calculating the braking force, the electric brake has the effect of calculating the braking force more accurately.

Claims

1. A three-way solenoid valve, comprising: The valve block includes a valve chamber and a first port, a second port, and a third port in fluid communication with the valve chamber; An armature is configured to provide electromagnetic force; The valve body includes a first valve body and a second valve body. One side of the first valve body faces the armature and has a hollow portion in the first valve body. One side of the second valve body faces the other side of the first valve body and has a hollow portion in the second valve body. A plunger, at least a portion of which passes through the hollow portion inside the first valve body and the hollow portion inside the second valve body, and one end of the plunger is configured to be pressed by the armature to move the plunger; A flow path control component is disposed inside the second valve body and includes a first on / off flow path and a second on / off flow path. The first on / off flow path allows the first port and the second port to be fluidly connected to or blocked from each other depending on the magnitude of the force applied by the plunger. The second on / off flow path allows the second port and the third port to be fluidly connected to or blocked from each other depending on the magnitude of the force applied by the plunger. When the armature uses a third electromagnetic force to press the plunger, the first open / close flow path opens, while the second open / close flow path closes.

2. The three-way solenoid valve according to claim 1, wherein, The groove in the lower end of the first valve body and the upper surface of the second valve body constitute the outer surface of the discharge flow path.

3. The three-way solenoid valve according to claim 1, wherein, The groove in the upper end of the first valve body and the lower surface of the first valve body constitute the outer surface of the discharge flow path.

4. The three-way solenoid valve according to claim 1, wherein, The lower surface of the first valve body is provided with an upwardly recessed groove, and At least a portion of the second valve body is accommodated in the recessed portion.

5. The three-way solenoid valve according to claim 1, wherein, The lower end of the first valve body is provided with a flange portion for fixing the first valve body to the valve chamber.

6. The three-way solenoid valve according to claim 1, wherein, The armature is configured to provide a first electromagnetic force, a second electromagnetic force greater than the first electromagnetic force, and a third electromagnetic force greater than the second electromagnetic force, and The opening / closing states of the first and second opening / closing flow paths are controlled by the electromagnetic force provided by the armature.

7. The three-way solenoid valve according to claim 6, wherein, When the armature uses the first electromagnetic force to squeeze the plunger, the first open / close flow path closes, while the second open / close flow path opens.

8. The three-way solenoid valve according to claim 6, wherein, When the armature uses the second electromagnetic force to squeeze the plunger, the first open / close flow path and the second open / close flow path are closed.

9. The three-way solenoid valve according to claim 1, wherein, When the armature does not compress the plunger, the second open / close flow path is opened due to the pressure of the second port and the third port.

10. The three-way solenoid valve according to claim 1, wherein, The amount of fluid flowing between the first port, the second port, and the third port varies according to the electromagnetic force applied to the armature.

11. The three-way solenoid valve of claim 1, further comprising a check valve configured to allow fluid to flow only from the second port to the third port.

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