Pedal feeling simulator applied to integrated intelligent braking system onebox

Abstract

The invention relates to a pedal feeling simulator applied to an integrated intelligent braking system onebox, and belongs to an integrated intelligent braking system in the technical field of automobile braking systems. The simulator shell and the large valve block are assembled together through the steel wire clamping ring, the piston is located in the large valve block, the one-way sealing leather cup is assembled on the large valve block, the ejector rod is riveted to the piston, the rubber damper is assembled in the damping seat and located in the simulator shell, the damping seat is sleeved with the large spring, and the top of the large spring is located below the spring seat. The spring seat is sleeved outside the ejector rod and slidably connected with the inside of the piston, the small spring is located in the spring seat and sleeved outside the ejector rod, and the upper portion of the small spring abuts against the piston. The pedal has the advantages of novel structure, three-section foot feeling, smooth foot feeling, hysteresis characteristic, convenience for adjusting, matching and customizing the pedal, long service life, modular structural design, fast assembly rhythm on a production line, high efficiency and high performance consistency.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile braking systems and relates to an integrated intelligent braking system, and in particular to a pedal feeling simulator applied to an integrated intelligent braking system onebox. Background Art

[0002] The main function of the pedal feel simulator is to simulate the real pedal operation feeling, so that the driver can feel the change of braking force, thereby improving driving safety and comfort. Compared with traditional brake braking, the brake pedal feel simulator has a more sensitive braking effect and can better meet the driver's demand for vehicle braking. By using the brake pedal simulator, the driver can control the vehicle's braking effect more flexibly and improve driving stability and safety.

[0003] The most typical integrated intelligent brake system pedal feel simulators are BOSCH's IPB and Conti's MKC-1. Figure 7 : It mainly includes simulator housing 1, the first group of disc springs 2, the second group of disc springs 3, the third group of disc springs 4, the fourth group of disc springs 5, the fifth group of disc springs 6, the sixth group of disc springs 7, O-ring 8, front end cover 9, one-way piston sealing leather cup 10, push rod 11, piston 12, large valve block 13 and locking nut 14. The working principle of Bosch IPB pedal feel simulator: when the pedal is pressed forward, the brake fluid in the first chamber of the brake master cylinder enters the simulator chamber, and the six groups of disc springs enter and are compressed one by one, generating six sections of forward pedal feel with a total of 5 inflection points; when the pedal is retracted and released, the brake fluid in the simulator chamber flows back to the first chamber of the master cylinder, and the six groups of disc springs enter and are released one by one, generating six sections of backward retraction pedal feel with a total of 5 inflection points.

[0004] See the schematic diagram of Conti's MKC-1 pedal feel simulator for details. Figure 8 : It mainly includes the simulator back cover 1, rubber damper 2, push rod 3, large valve block 4, one-way sealing leather cup 5, small spring 6 and piston 7. The working principle of the MKC-1 pedal feel simulator: when the pedal is pressed forward, the brake fluid in the first chamber of the master cylinder enters the simulator chamber, and the small spring enters compression, generating the first section of the forward pedal feel; after the small spring is compressed into place, the small spring and the rubber damper enter compression together to generate the second section of the forward pedal feel. The first section of the forward pedal feel plus the second section of the forward pedal feel together constitute the forward pedal feel; when the pedal is released back, the brake fluid in the simulator chamber flows back to the first chamber of the master cylinder, and the small spring and the rubber damper are released together to generate the first section of the backward pedal feel. When the rubber damper is released, the small spring begins to release alone, forming the second section of the backward pedal feel. The first section of the backward pedal feel plus the second section of the backward pedal feel form the backward pedal feel.

[0005] The existing solutions have shortcomings and deficiencies, including: Bosch's IPB pedal feel simulator uses six sets of disc springs in series, which brings the following disadvantages: 1. The pedal feel displacement-force curve has 6 sections, with obvious turning points and an uneven pedal feel; 2. There is an abnormal sound when the disc spring releases force; 3. No hysteresis characteristics; 4. As the lifespan decreases, the disc spring performance declines and the pedal feel changes greatly; 5. The metal powder produced by the disc spring wear contaminates the brake fluid, causing the brake fluid to fail.

[0006] Conti's MKC-1 pedal feel simulator uses a small spring plus rubber damper structure, which brings the following disadvantages: 1. The pedal feel displacement-force curve has only two sections; 2. The characteristics of rubber dampers change greatly with temperature, resulting in large changes in pedal feel.

[0007] 3. The service life of the rubber damper is short, which does not match the service life requirements of the vehicle. Summary of the invention

[0008] The present invention provides a pedal feeling simulator applied to an integrated intelligent braking system onebox, so as to solve the problems of insufficient performance and durability of the existing pedal feeling simulators.

[0009] The technical solution adopted by the present invention is, including a simulator housing, a rubber damper, a damper seat, a large spring, a wire clamp, a spring seat, a one-way sealing leather cup, a piston, a small spring, a push rod and a large valve block, wherein the simulator housing is assembled with the large valve block through a wire clamp, the piston is located in the large valve block, the one-way sealing leather cup is assembled to the large valve block, the push rod is riveted to the piston, the rubber damper is assembled into the damping seat and is located in the simulator housing, the large spring is sleeved on the outside of the damping seat and the top is located below the spring seat, the spring seat is sleeved on the outside of the push rod and is slidably connected to the inside of the piston, the small spring is located in the spring seat, it is sleeved on the outside of the push rod and the upper part is connected to the top of the piston.

[0010] The simulator shell is the base and cover of the simulator, and a clamping ring groove is opened on the upper part for connecting with the large valve block. Two balanced air pressure convection holes are opened on the lower part so that when the volume changes, the gas in the rear cavity of the simulator can enter and be discharged, providing normal pressure for the one-way sealing leather cup 7 and maintaining the sealing performance in real time.

[0011] The rubber damper is a variable stiffness rubber elastic damper, with a conical front end and a cylindrical rear end to achieve variable stiffness. The stiffness increases rapidly with the increase in compression. Three deformation grooves are opened along the axial direction to achieve hysteresis characteristics in the forward and backward processes.

[0012] The damping seat is a metal stamping part, which provides a limited deformation space for the rubber damper so as to meet the displacement and force characteristic requirements of the third forward section or the first backward section of the pedal feel.

[0013] The large spring is a compression spring, and is the main elastic element providing the pedal feel for the second forward section and the second rearward section.

[0014] The spring seat is a large spring mounting seat and is also an outer guide sleeve for mounting a small spring.

[0015] The specification of the one-way sealing leather cup 7 is 25.4 mm, which provides sealing for the simulator working chamber pressure.

[0016] The piston has a diameter of 25.4 mm, an effective stroke of 12 mm, and a pressure follower element in the simulator cavity.

[0017] The small spring is a compression spring, and is the main elastic element providing the pedal feel for the first forward section and the third rearward section.

[0018] The large valve block is a forged aluminum alloy part, which is a simulator oil circuit block and also a simulator mounting base.

[0019] The advantages of the present invention are novel structure, strict correspondence with the pedal feel displacement-force curve stipulated in the regulation GB21670, three-stage foot feel, smooth foot feel, hysteresis characteristics, convenient adjustment, matching and customization of pedals, cylinder sealing form, and under 95% of the working conditions, the rubber damper does not participate in the work, thereby ensuring the pedal feel and long life requirements of the simulator, modular structural design, fast and efficient assembly on the production line, and high performance consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 AA section view; Figure 3 It is a structural schematic diagram of the simulator housing of the present invention; Figure 4 It is a structural schematic diagram of the rubber damper of the present invention; Figure 5 It is a structural schematic diagram of the damper seat of the present invention; Figure 6 is a graph of pedal force and push rod displacement according to the present invention; Figure 7 This is a schematic diagram of the IPB pedal feel simulator from BOSCH; Figure 8 This is a schematic diagram of Conti's MKC-1 pedal feel simulator. DETAILED DESCRIPTION

[0021] See also Figure 1 , 2 , including a simulator housing 1, a rubber damper 2, a damper seat 3, a large spring 4, a wire clamp 5, a spring seat 6, a one-way sealing leather cup 7, a piston 8, a small spring 9, a push rod 10 and a large valve block 11, wherein the simulator housing 1 is assembled with the large valve block 11 through the wire clamp 5, the piston 8 is located in the large valve block 11, the one-way sealing leather cup 7 is assembled on the large valve block 11, the push rod 10 and the piston 8 are riveted to form a riveted component, the rubber damper 2 is assembled into the damping seat 3 and is located in the simulator housing 1, the large spring 4 is sleeved on the outside of the damping seat 3, and the top is located below the spring seat 6, the spring seat 6 is sleeved on the outside of the push rod 10 and is slidably connected with the inside of the piston 8, the small spring 9 is located in the spring seat 6, it is sleeved on the outside of the push rod 10, and the upper part is connected with the piston 8.

[0022] See also Figure 3 The simulator housing 1 is the base and cover of the simulator, and a retaining ring groove 101 is provided on the upper part for connecting with the large valve block 11, and two balanced air pressure convection holes 102 are provided on the lower part so that when the volume changes, the gas in the rear cavity of the simulator can enter and be discharged, thereby providing normal pressure for the one-way sealing leather cup 7 and maintaining the sealing performance in real time.

[0023] See also Figure 4 The rubber damper 2 is a variable stiffness rubber elastic damper, with a conical head 202 at the front end and a cylindrical rear end to achieve variable stiffness. The stiffness increases rapidly with the increase in compression. Three deformation grooves 201 are opened along the axial direction to achieve hysteresis characteristics in the forward and backward processes.

[0024] See also Figure 5 The damping seat 3 is a metal stamping part, which provides a limited deformation space for the rubber damper 2 to meet the displacement and force characteristics requirements of the third forward section or the first backward section of the pedal feel.

[0025] The large spring 4 is a compression spring and is the main elastic element providing the pedal feel of the second forward section and the second rearward section.

[0026] The spring seat 6 is a large spring mounting seat and is also an outer guide sleeve for mounting the small spring 9 .

[0027] The specification of the one-way sealing leather cup 7 is 25.4 mm, and it is in the form of a cylinder seal, providing a seal for the simulator working chamber pressure.

[0028] The piston 8 has a diameter of 25.4 mm, an effective stroke of 12 mm, and a pressure follower element in the simulator cavity. It is suitable for A-class, B-class, and C-class vehicles.

[0029] The small spring 9 is a compression spring, and is the main elastic element providing the pedal feel in the first forward section and the third backward section.

[0030] The large valve block 11 is a forged aluminum alloy part, which is a simulator oil circuit block and also a simulator mounting base.

[0031] Working principle: When the pedal is stepped forward, the brake fluid in the first chamber of the master cylinder enters the simulator chamber, the brake fluid pushes the piston 8, the small spring 9 enters compression, and at the same time the gap between the piston 8 and the guide sleeve 6 is eliminated, generating the first section of forward pedal feeling; after the small spring 9 is compressed into place, the small spring 9 and the large spring 4 enter compression together, generating the second section of forward pedal feeling; when the braking intensity is relatively large, as the compression displacement of the large spring increases, under the action of the push rod 10, the rubber damper 2 with a conical head and a deformation groove assembled in the damping seat 3 is compressed, the small spring 9 and the large spring 4 and the rubber damper 2 enter compression together, generating the third section of forward pedal feeling, the first section of forward pedal feeling plus the second section of forward pedal feeling and the third section of forward pedal feeling together constitute the forward pedal feeling; When the pedal is released, the brake fluid in the simulator chamber flows back to the master cylinder chamber, and the small spring 9, the large spring 4 and the rubber damper 2 are released together, producing the first stage of backward pedal feeling; when the rubber damper 2 is released, the small spring 9 and the large spring 4 begin to release, forming the second stage of backward pedal feeling; when the large spring 4 is released into place, the small spring 9 is released alone, forming the third stage of backward pedal feeling. The first stage of backward pedal feeling plus the second stage of backward pedal feeling and the third stage of backward pedal feeling form the backward pedal feeling.

[0032] Pedal force and push rod displacement curve see Figure 6 , the pedal feel displacement-force curve in the figure has three sections, which is closer to the actual pedal feel requirements. The forward three-section implementation structure is as follows: small spring 9 implements the first forward section curve, small spring 9 + large spring 4 implements the second forward section curve, small spring 9 + large spring 4 + rubber damper 2 implements the third forward section curve. The backward three-section implementation structure is as follows: small spring 9 + large spring 4 + rubber damper 2 implements the first backward section curve, small spring 9 + large spring 4 implements the second backward section curve, and small spring 9 implements the first backward section curve.

Claims

1. A pedal feel simulator for onebox integrated intelligent braking system, characterized in that: It includes a simulator shell, a rubber damper, a damper seat, a large spring, a wire clamp, a spring seat, a one-way sealing leather cup, a piston, a small spring, a push rod and a large valve block, wherein the simulator shell is assembled with the large valve block through a wire clamp, the piston is located in the large valve block, the one-way sealing leather cup is assembled to the large valve block, the push rod is riveted to the piston, the rubber damper is assembled into the damping seat and is located in the simulator shell, the large spring is sleeved on the outside of the damping seat and the top is located below the spring seat, the spring seat is sleeved on the outside of the push rod and is slidably connected to the inside of the piston, and the small spring is located in the spring seat, sleeved on the outside of the push rod and the upper part is connected to the top of the piston.

2. A pedal feel simulator for an integrated intelligent braking system onebox according to claim 1, characterized in that: The simulator shell is the base and cover of the simulator, and a clamping ring groove is opened on the upper part for connecting with the large valve block. Two balanced air pressure convection holes are opened on the lower part so that when the volume changes, the gas in the rear cavity of the simulator can enter and be discharged, providing normal pressure for the one-way sealing leather cup 7 and maintaining the sealing performance in real time.

3. The pedal feel simulator for integrated intelligent braking system onebox according to claim 1, characterized in that: The rubber damper is a variable stiffness rubber elastic damper, with a conical front end and a cylindrical rear end to achieve variable stiffness. The stiffness increases rapidly with the increase in compression. Three deformation grooves are opened along the axial direction to achieve hysteresis characteristics in the forward and backward processes.

4. The pedal feel simulator for integrated intelligent braking system onebox according to claim 1, characterized in that: The damping seat is a metal stamping part, which provides a limited deformation space for the rubber damper so as to meet the displacement and force characteristic requirements of the third forward section or the first backward section of the pedal feel.

5. The pedal feel simulator for integrated intelligent braking system onebox according to claim 1, characterized in that: The large spring is a compression spring, and is the main elastic element providing the pedal feel for the second forward section and the second rearward section.

6. The pedal feel simulator for integrated intelligent braking system onebox according to claim 1, characterized in that: The spring seat is a large spring mounting seat and is also an outer guide sleeve for mounting a small spring.

7. The pedal feel simulator for integrated intelligent braking system onebox according to claim 1, characterized in that: The specification of the one-way sealing leather cup 7 is 25.4 mm, which provides sealing for the simulator working chamber pressure.

8. The pedal feel simulator for onebox integrated intelligent braking system according to claim 1, characterized in that: The piston has a diameter of 25.4 mm, an effective stroke of 12 mm, and a pressure follower element in the simulator cavity.

9. The pedal feel simulator for onebox integrated intelligent braking system according to claim 1, characterized in that: The small spring is a compression spring, and is the main elastic element providing the pedal feel for the first forward section and the third rearward section.

10. The pedal feel simulator for integrated intelligent braking system onebox according to claim 1, characterized in that: The large valve block is a forged aluminum alloy part, which is a simulator oil circuit block and also a simulator mounting base.

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