Two-stage pilot-operated type pedal simulator isolating valve for integrated intelligent braking system

Abstract

The invention relates to a two-stage pilot-operated type pedal simulator isolating valve for an integrated intelligent braking system, and belongs to two-stage pilot-operated type normally-closed electromagnetic valves of braking systems. Comprising a valve seat, a valve element, a valve element sheath, a filter screen, a valve body, a coil lower yoke, an armature, a spring, a coil winding, a coil framework, a plunger tube, static iron, a coil PIN, coil damping rubber, a coil shell yoke and a positioning column. The valve sleeve structure has the advantages that the structure is novel, the valve sleeve structure is integrated on the valve seat, the valve sleeve structure and the valve seat are integrated, a failure link and an assembly procedure are omitted, the assembly procedure is simplified, the assembly rhythm of a production line is accelerated, the installation space is reasonable, and the whole structure space is reduced; the PEEK valve element is small in conduction coefficient when collided with the valve seat and collided by the armature, excellent in NVH performance, non-magnetic, small in inertia and suitable for high-frequency PWM control.

Description

Technical Field

[0001] The invention belongs to a two-stage pilot-operated normally closed solenoid valve of a brake system, and in particular relates to a two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent brake system. Background Art

[0002] The existing integrated intelligent braking system generally consists of two hydraulic decoupling circuits: a pedal feel simulation circuit and a wheel cylinder pressure servo control circuit. Figure 3 As shown, the pedal feel simulation circuit A includes a pedal, a master cylinder push rod, a master cylinder chamber, a decoupling solenoid valve CSV, a simulator isolation valve SSV and a pedal feel simulator, and its function is to provide a simulated pedal feel. The wheel cylinder pressure servo control circuit B includes a decoupling valve CSV, a pressure servo control unit isolation valve PSV, a pressure servo control unit PSU, a pressure sensor PS, and a wheel cylinder, and its function is to provide the braking force required by the wheel cylinder following the ECU command.

[0003] Typical products of intelligent integrated brake systems currently installed include Bosch IPB and Conti MKC-1. Bosch IPB and MKC-1 both have a simulator isolation valve SSV in the pedal feel simulation circuit. Figure 4 , 5 As shown, the Bosch IPB simulator isolation valve SSV includes a valve cover 1, an annular filter 2, a valve sleeve 3, a lower filter 4, a valve seat 5, a valve core 6, a valve core return spring 7, a valve core sleeve 8, an armature 9, an armature return spring 10, a magnetic isolation tube 11, a static iron 12, a coil PIN 13, a coil vibration damping rubber ball 14, a coil housing (yoke iron) 15, a coil frame 16, a coil winding 17 and a coil lower yoke 18. Figure 6 , 7 As shown, the Conti MKC-1 simulator isolation valve SSV includes a valve body 1, an annular filter 2, a valve sleeve 3, a lower filter 4, a valve seat 5, a metal valve core 6, a valve core sleeve 7, an armature return spring 8, an armature 9, a magnetic isolation tube 10, a static iron 11, a coil PIN 12, a coil pre-compression spring 13, a coil upper yoke 14, a coil frame 15, a coil winding 16, and a coil housing (yoke iron) 17.

[0004] Bosch IPB simulator isolation valve SSV main shortcomings: (1) In terms of valve response, the solenoid valve responds slowly when entering the working mode from the infrequently powered mode, especially in the cold start mode with the pedal pressed, which will cause problems such as pushing the foot and not following the foot due to SSV lag.

[0005] (2) The riveting and sealing process of the Bosch SSV valve cover and the magnetic isolation tube has extremely high requirements for the stability of materials and riveting pressure parameters. The riveting and sealing process between the valve cover and the magnetic isolation sleeve is difficult, and the stability of the riveting quality on the production line is a problem.

[0006] (3) The Bosch SSV valve coil damping rubber ball and coil are split structures, and the assembly process is divided into two steps. The production line assembly cycle is long and the efficiency is low.

[0007] The main shortcomings of the Conti MKC-1 simulator isolation valve SSV: (1) Conti MKC-1 SSV 1st stage valve diameter is 1.60mm; 2nd stage valve diameter is 3.18mm; rated working current is 9.5A at 13.5V. It is a large-diameter, high-current 2nd stage valve with poor pressure controllability and high cost of corresponding hardware drive circuit and chip.

[0008] (2) The appearance is relatively large, with a total height of 48mm and a maximum outer diameter of 23mm. It requires a large installation space and is difficult to arrange compactly, resulting in the enlargement of the entire structure. Summary of the invention

[0009] The invention provides a two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system, so as to solve the existing problems of large and complex structure, low assembly efficiency and high cost.

[0010] The technical solution adopted by the present invention is to include a valve seat, a valve core, a valve core sleeve, a filter screen, a valve body, a coil lower yoke, an armature, a spring, a coil winding, a coil skeleton, a magnetic isolation tube, a static iron, a coil PIN, a coil vibration-damping rubber, a coil housing yoke and a positioning column, wherein the valve body and the valve seat are riveted together in a large valve block, the lower end of the filter screen is interference-fitted with the valve seat, the upper end of the valve core is matched with the valve ball of the armature, and the lower end is matched with the valve seat, the upper end of the valve core sleeve is interference-fitted with the armature, and the lower end limits the valve core, the armature is slidably connected to the valve body, and the coil The upper end face of the lower yoke fits with the lower end face of the coil skeleton, and the outer cylindrical surface is interference fit with the inner cylindrical surface of the coil shell. The spring is located in the armature, and the top end is connected to the static iron. The coil winding is a spiral tube coil made of enameled wire wound on the coil skeleton. The coil skeleton is between the upper yoke and the shell of the coil and the lower yoke of the coil. The upper end of the magnetic isolation tube and the static iron are connected and sealed by laser welding, and the lower end is connected to the valve body by laser welding. The coil PIN is connected to the coil winding, the coil vibration damping rubber is installed on the upper part of the yoke of the coil shell, and the lower end of the positioning column is integrally connected to the coil skeleton.

[0011] The valve port conical surface of the valve seat is an inner conical surface and is ground, and the center hole of the valve seat is used for throttling.

[0012] The valve core is a PEEK precision injection molded part, the upper end of which is a primary valve seat, and the lower end of which is a secondary valve ball.

[0013] The valve core sleeve is a precision drawn part made of stainless steel, which provides guidance for the valve core and also serves as a limit seat for the valve core. There are two symmetrical throttling holes on the side along the radial direction.

[0014] The armature is formed by riveting a moving iron body and a steel ball, and is both a moving iron core and a valve ball of a first-stage valve. Two symmetrically distributed flow-stabilizing grooves are arranged on the outer circumferential surface along the axial direction.

[0015] The magnetic isolation tube is a precision stamping part made of stainless steel. The static iron and the lower end of the magnetic isolation tube are connected by laser welding. The valve body is made of high magnetic permeability soft magnetic alloy and is connected to the lower end of the magnetic isolation tube by laser welding.

[0016] The static iron is made of soft magnetic alloy material by cold heading, and when the electromagnetic valve is working, it and the first-stage valve armature serve as an electromagnetic coupling component.

[0017] The coil PI is a solid pressfit structure and is the lead connecting the coil winding and the ECU PCB board.

[0018] The coil vibration-damping rubber is made of vulcanized EPDM material.

[0019] The coil shell yoke is formed by stretching and stamping of soft magnetic material, a high magnetic permeability part, and is the main path for the coil winding to generate a closed loop of magnetic lines of force outside the coil. The upper plane and the inner flange constitute the upper yoke, which is matched with the magnetic isolation tube with a small air gap, and the lower part is interference fit with the lower yoke of the coil.

[0020] The advantages of the present invention are novel structure, advantages in valve seat and valve body structure and assembly process, the lower end of the valve body and the upper end of the valve seat are internally riveted and sealed, the valve body has sufficient wall thickness to provide good guidance when assembled with the valve seat, and the valve body and the valve seat are not easily deformed when assembled, and at the same time, when the SSV valve component and the valve block are assembled and riveted, the main riveting pressure is borne to protect the valve seat from deformation, the structure is simple and reliable, the process requirements are reduced, and the key characteristics are guaranteed.

[0021] The valve seat in other similar valves is composed of two parts. The present invention integrates the valve sleeve structure into the valve seat, combining the two into an integrated design, which reduces one failure link and one assembly process.

[0022] The coil vibration damping rubber is made of vulcanized EPDM material and is firmly bonded to the coil after interference fit with the positioning column on the coil frame, providing pre-pressure for the installation of the coil on the solenoid valve and attenuating the impact force generated during the attraction, release and assembly vibration of the coil and solenoid valve, so as to protect the crimped conductive structure of the coil PIN and ECU PCB board and improve its durability. It is modularly designed, and there is only one assembly process for the production line assembly, which simplifies the assembly process and speeds up the production line assembly rhythm.

[0023] The valve core is a PEEK precision injection molded part, replacing the previous one-piece metal armature structure, reducing the weight of the armature and improving the stability and response characteristics of the control. The overall dimensions are 36mm in height and 18mm in maximum outer circle. The installation space is reasonable and the entire structural space is reduced. The PEEK valve core has a small conduction coefficient when it impacts the valve seat and is impacted by the armature, and has excellent NVH performance. It is also non-magnetic and has a small inertia, making it suitable for high-frequency PWM control. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the external structure of the present invention; Figure 2 is an axial cross-sectional view of the present invention; Figure 3 This is the schematic diagram of the integrated intelligent braking system where the pedal simulator isolation valve SSV is currently located; Figure 4 This is a schematic diagram of the external structure of the Bosch IPB pedal simulator isolation valve SSV; Figure 5 This is an axial view of the Bosch IPB pedal simulator isolation valve SSV; Figure 6 It is a schematic diagram of the external structure of the Conti MKC-1 pedal simulator isolation valve SSV; Figure 7 An axial view of the Conti MKC-1 pedal simulator isolation valve SSV. DETAILED DESCRIPTION

[0025] like Figure 1 , 2As shown, it includes a valve seat 1, a valve core 2, a valve core sleeve 3, a filter screen 4, a valve body 5, a coil lower yoke 6, an armature 7, a spring 8, a coil winding 9, a coil skeleton 10, a magnetic isolation tube 11, a static iron 12, a coil PIN 13, a coil vibration reduction rubber 14, a coil housing yoke 15 and a positioning column 16, wherein the valve body 5 and the valve seat 1 are riveted together in a large valve block 17, the lower end of the filter screen 4 is interference-fitted with the valve seat 1, the upper end of the valve core 2 is matched with the valve ball of the armature 7, and the lower end is matched with the valve seat 1, and the upper end of the valve core sleeve 3 is interference-fitted with the armature 7 , the lower end limits the valve core 2, the armature 7 is slidably connected to the valve body 5, the upper end face of the coil lower yoke 6 is fitted with the lower end face of the coil skeleton 10, and the outer cylindrical surface is interference fit with the inner cylindrical surface of the coil shell 15, the spring 8 is located in the armature 7, and the top end is connected with the static iron 12, the coil winding 9 is a spiral tube coil wound by enameled wire on the coil skeleton 10, the coil skeleton 10 is between the coil upper yoke and the shell 15 and the coil lower yoke 6, the upper end of the magnetic isolation tube 11 and the static iron 12 are connected and sealed by laser welding, and the lower end is connected to the valve body 5 by laser welding, the coil PIN 13 is connected to the coil winding 9, the coil vibration damping rubber 14 is installed on the upper part of the coil shell yoke 15, and the lower end of the positioning column 16 is integrally connected with the coil skeleton 10.

[0026] The valve port conical surface of the valve seat 1 is an inner conical surface and is ground. The center hole of the valve seat is used for throttling. The size and length of the center hole determine the throttling parameters.

[0027] The valve core 2 is a PEEK precision injection molded part, the upper end of which is a primary valve seat, and the lower end of which is a secondary valve ball.

[0028] The valve core sheath 3 is a precision drawn part made of stainless steel, which provides guidance for the valve core 2 and also serves as a limit seat for the valve core 2. There are two symmetrical throttling holes on the side along the radial direction.

[0029] The armature 7 is formed by riveting a moving iron body and a steel ball, and is both a moving iron core and a valve ball of a primary valve. Two symmetrically distributed flow stabilizing grooves are arranged on the outer circumference along the axial direction.

[0030] The magnetic isolation tube 11 is a precision stamped part made of stainless steel. The static iron 12 and the lower end of the magnetic isolation tube 11 are connected by a laser weld 19. The valve body 5 is made of a high magnetic permeability soft magnetic alloy and is connected to the lower end of the magnetic isolation tube 11 by a laser weld 18.

[0031] The static iron 12 is made of a soft magnetic alloy material by cold heading. When the solenoid valve is working, it and the first-stage valve armature 7 form an electromagnetic coupling component and have a high magnetic conductivity.

[0032] The coil PIN 13 is a solid pressfit structure, which is a lead connecting the coil winding 9 and the ECU PCB board, and is connected to the ECU PCB board through a pressfit structure. The ECU PCB board provides a voltage or current control signal to the coil winding (part 9) through the coil PIN.

[0033] The coil vibration damping rubber 14 is made of vulcanized EPDM material, which provides pre-pressure for the installation of the coil on the solenoid valve and attenuates the vibration generated during the attraction and release of the coil and the solenoid valve, so as to protect the crimped conductive structure of the coil PIN 13 and the ECU PCB board and improve its durability.

[0034] The coil housing (yoke iron) 15 is formed by stretching and stamping of soft magnetic material, a high magnetic permeability part, and is the main path for the coil winding 9 to generate a closed loop of magnetic lines outside the coil. The upper plane and the inner flange constitute the upper yoke, which is matched with the magnetic isolation tube 11 with a small air gap, and the lower part is interference fit with the coil lower yoke 6 to minimize leakage magnetic field.

[0035] How it works The pedal simulator isolation valve SSV of the present invention is a pilot-operated two-stage normally closed solenoid valve used in an integrated braking system. Figure 3 As shown. Through PWM control, the master cylinder chamber and the pedal feeling simulator hydraulic circuit are isolated or connected to realize the control function of the pedal simulator. The new structure SSV meets the normal 0.5A working mode, so the load response time is shortened and the real-time performance of the control simulator is improved.

[0036] When the solenoid valve coil is not energized, the solenoid valve is in a normally closed state, and the steel ball at the top of the armature 7 is pressed against the conical sealing surface of the valve core 2 to form a primary valve port sealing ring. At the same time, the valve core 2 is pressed against the conical sealing surface of the valve seat 1 to form a secondary valve port sealing ring, and liquid cannot flow through. After the ECU PCB board provides a voltage or current control signal to the coil through the coil PIN 13, the static iron 12 generates a magnetic force to overcome the resistance of the spring 8 and electromagnetically couple with the armature 7. First, the armature 7 is lifted and separated from the valve core 2 to achieve the conduction between the first chamber of the master cylinder and the hydraulic circuit of the pedal feel simulator, quickly balance the pressure difference on both sides of the inlet and outlet, and rely on the action of the fluid to promote the separation of the valve core 2 and the valve seat 1, open the main valve port, connect the side and the bottom, and open the liquid circuit. At this time, the first chamber of the master cylinder and the hydraulic circuit of the pedal feel simulator are fully connected.

Claims

1. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system, characterized in that: It includes valve seat, valve core, valve core sleeve, filter screen, valve body, coil lower yoke, armature, spring, coil winding, coil skeleton, magnetic isolation tube, static iron, coil PIN, coil vibration reduction rubber, coil shell yoke and positioning column, wherein the valve body and valve seat are riveted together in the large valve block, the lower end of the filter screen is interference fit with the valve seat, the upper end of the valve core is matched with the valve ball of the armature, and the lower end is matched with the valve seat, the upper end of the valve core sleeve is interference fit with the armature, and the lower end limits the valve core, the armature is slidably connected to the valve body, and the upper end surface of the coil lower yoke is It is fitted with the lower end face of the coil skeleton, and the outer cylindrical surface is interference fit with the inner cylindrical surface of the coil shell. The spring is located in the armature, and the top end is connected with the static iron. The coil winding is a spiral tube coil made of enameled wire wound on the coil skeleton. The coil skeleton is located between the coil upper yoke and the shell and the coil lower yoke. The upper end of the magnetic isolation tube and the static iron are connected and sealed by laser welding, and the lower end is connected to the valve body by laser welding. The coil PIN is connected to the coil winding, the coil vibration damping rubber is installed on the upper part of the coil shell yoke, and the lower end of the positioning column is integrally connected to the coil skeleton.

2. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The valve port conical surface of the valve seat is an inner conical surface and is ground, and the center hole of the valve seat is used for throttling.

3. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The valve core is a PEEK precision injection molded part, the upper end of which is a primary valve seat, and the lower end of which is a secondary valve ball.

4. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The valve core sleeve is a precision drawn part made of stainless steel, which provides guidance for the valve core and also serves as a limit seat for the valve core. There are two symmetrical throttling holes on the side along the radial direction.

5. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The armature is formed by riveting a moving iron body and a steel ball, and is both a moving iron core and a valve ball of a first-stage valve. Two symmetrically distributed flow-stabilizing grooves are arranged on the outer circumferential surface along the axial direction.

6. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The magnetic isolation tube is a precision stamping part made of stainless steel. The static iron and the lower end of the magnetic isolation tube are connected by laser welding. The valve body is made of high magnetic permeability soft magnetic alloy and is connected to the lower end of the magnetic isolation tube by laser welding.

7. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The static iron is made of soft magnetic alloy material by cold heading, and when the electromagnetic valve is working, it and the first-stage valve armature serve as an electromagnetic coupling component.

8. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The coil PI is a solid pressfit structure and is the lead connecting the coil winding and the ECU PCB board.

9. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The coil vibration-damping rubber is made of vulcanized EPDM material.

10. A two-stage pilot-operated pedal simulator isolation valve for an integrated intelligent braking system according to claim 1, characterized in that: The coil shell yoke is formed by stretching and stamping of soft magnetic material, a high magnetic permeability part, and is the main path for the coil winding to generate a closed loop of magnetic lines of force outside the coil. The upper plane and the inner flange constitute the upper yoke, which is matched with the magnetic isolation tube with a small air gap, and the lower part is interference fit with the lower yoke of the coil.

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