Brake system and brake method integrating hydraulic damping pedal sensing and mechanical backup

Abstract

The invention discloses a brake system and method integrating hydraulic damping pedal sensing and mechanical backup, and belongs to the field of automobile braking. The brake system comprises a brake pedal, and the power output end of the brake pedal is aligned with one end of a secondary lever assembly through a primary lever assembly and a section of spring assembly in sequence; the other end of the secondary lever assembly is aligned with the hydraulic backup assembly through the two-section spring assembly, the hydraulic backup assembly communicates with the four brake wheel cylinders through pipelines, and the pipelines are provided with one-way electromagnetic valves which are in one-way conduction in the direction of the brake wheel cylinders. The rigidity of the first-section spring assembly is larger than that of the second-section spring assembly, a fulcrum is arranged at the end, close to the first-section spring assembly, of the secondary lever assembly, and the fulcrum is perpendicularly and rotationally connected with the mounting shell through a supporting base so as to amplify pedal feedback force. According to the braking system and method integrating the hydraulic damping pedal feeling and the mechanical backup, through the arrangement of the large spring, the small spring and the secondary lever assembly, the small-stroke large-damping pedal feeling is achieved, and the pedal simulation experience feeling is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive braking, and particularly to a braking system and a braking method integrating hydraulic damping pedal feel and mechanical backup. Background Art

[0002] In the automotive industry, the development trend of electrification and intelligentization is profoundly changing the pattern of automotive braking systems. From the early traditional vacuum boosters to electronic stability control systems (ESC), electric booster braking systems (ibooster), integrated braking systems (one-box), and now the gradual mass production application stage of electro-mechanical braking systems (EMB), the wire-controlled braking systems are constantly innovating, and their core goal is to improve the driving experience and ensure braking safety.

[0003] Among them, when the traditional vacuum booster provides braking assistance, the pedal feel is relatively rigid and cannot precisely meet the pursuit of modern consumers for a comfortable driving experience. The ibooster uses a pure spring type to simulate the foot feel, and there are deficiencies in damping and hysteresis forces, making it difficult to create an ideal pedal feedback. In addition, the performance of these two systems in terms of noise, vibration, and harshness (NVH) is also unsatisfactory, and noise and vibration are likely to occur during vehicle driving.

[0004] With the development of technology, the EMB emerged. With its 4 sets of independent braking systems, it shows certain advantages in braking performance and can achieve more precise braking force distribution. However, due to the lack of mechanical backup in the EMB, once the electronic system fails, the reliability of the entire braking system will be greatly threatened, which undoubtedly becomes a key factor restricting its wide application. Summary of the Invention

[0005] The purpose of the present invention is to provide a braking system and a braking method integrating hydraulic damping pedal feel and mechanical backup to solve the above technical problems.

[0006] To achieve the above purpose, the present invention provides a braking system integrating hydraulic damping pedal feel and mechanical backup, including a brake pedal. The power output end of the brake pedal is aligned with one end of a secondary lever assembly through a primary lever assembly and a first-stage spring assembly in sequence. The other end of the secondary lever assembly is aligned with a hydraulic backup assembly through a second-stage spring assembly. The hydraulic backup assembly is connected to four brake wheel cylinders through pipelines, and one-way solenoid valves that conduct unidirectionally towards the brake wheel cylinders are arranged on the pipelines. The stiffness of the first-stage spring assembly is greater than that of the second-stage spring assembly. The force arm length of the primary lever assembly is less than that of the secondary lever assembly. A fulcrum is arranged at one end of the secondary lever assembly close to the first-stage spring assembly, and the fulcrum is vertically rotatably connected to the mounting shell through a support seat to amplify the pedal feedback force.

[0007] Preferably, a pressure wheel is vertically rotatably connected to the power output position of the brake pedal via a rotating shaft. The pressure wheel is in rolling contact with one end of the primary lever assembly. The other end of the primary lever assembly is vertically rotatably connected to the fulcrum. The rotation connection between the primary lever assembly and the fulcrum is coaxial with the rotation connection between the fulcrum and the mounting housing. In the initial state, one end of the primary lever assembly close to the pressure wheel is connected to the power input end of the secondary lever assembly via a spring assembly, and the spring assembly and the pressure wheel are respectively disposed on both sides of the primary lever assembly.

[0008] Preferably, the hydraulic backup assembly is a liquid reservoir. The power output end of the secondary lever assembly is connected to one end of a second spring assembly. The other end of the second spring assembly is connected to the power input end of the liquid reservoir. The oil outlet end of the liquid reservoir is communicated with one end of the main pipeline. The other end of the main pipeline is respectively connected to four brake wheel cylinders via four branch pipelines. A one-way solenoid valve is arranged on the main pipeline.

[0009] Preferably, one end of the brake pedal is fixedly connected to the brake pedal body, and the other end extends into the interior of the mounting housing and is vertically rotatably connected to the inner wall of the mounting housing. Corner sensors are respectively arranged at the rotation connection between the brake pedal and the mounting housing and at the rotation connection between the fulcrum and the support seat. The corner sensors are connected to the brake wheel cylinders via a domain control ECU, and are used for controlling the brake wheel cylinders to execute braking forces matching the rotation angle according to the rotation angle of the brake pedal collected by the corner sensors. The on-vehicle fault monitoring module is electrically connected to the one-way solenoid valve via the domain control ECU, and is used for opening the one-way solenoid valve for braking backup when a mechanical braking fault is monitored. The one-way solenoid valve is a normally closed solenoid valve.

[0010] Preferably, a rear cover is fixed to one side of the mounting housing. A perforation is left between the rear cover and the mounting housing. The brake pedal passes through the perforation formed in the mounting housing and penetrates into the mounting housing. Vibration damping pads are respectively arranged on the side of the mounting housing facing the brake pedal and on the side of the rear cover facing the brake pedal, and are used for reducing the noise generated when the brake pedal collides with the perforation wall during braking.

[0011] Preferably, the force relationship formula of the first spring assembly and the second spring assembly is , where and are respectively the force generated by the first spring assembly and the corresponding force arm, and are respectively the force generated by the second spring assembly and the corresponding force arm, and ; The lever ratio of the end of the secondary lever assembly close to the first spring assembly to the end of the secondary lever assembly close to the second spring assembly , It is the forward displacement generated by the pressing wheel following the braking of the brake pedal.

[0012] Preferably, the other side of the mounting shell is connected to the firewall component, and the firewall component is detachably connected to the vehicle firewall via riveting screws.

[0013] Preferably, the mounting shell, the brake pedal, the support seat, the primary lever assembly, and the secondary lever assembly are all injection molded from PBT+GF30%.

[0014] The braking method of the braking system based on the integration of hydraulic damping pedal feel and mechanical backup includes a braking stage and a release stage; In the braking stage, under normal conditions, the one-way solenoid valve is in the closed state for mechanical braking. At this time, when the brake pedal is depressed, the brake pedal rotates downward, presses the primary lever assembly downward through the pressing wheel, and then presses one end of the secondary lever assembly downward through a spring assembly. At this time, under the action of the fulcrum, the other end of the secondary lever assembly compresses the two-stage spring assembly to amplify the pedal feedback force; at the same time, the angle sensor collects the rotation angle of the brake pedal and transmits the angle signal to the domain control ECU. The domain control ECU converts it into a braking force drive command and sends it to the EMB, and the EMB drives the brake wheel cylinder to generate the corresponding braking force for braking; In the fault state, after the fault monitoring module detects a mechanical braking fault, it opens the one-way solenoid valve, and the pedal force drives the hydraulic oil in the reservoir to be output to the brake wheel cylinder to achieve hydraulic braking backup; In the release stage, when the brake pedal is released, under the action of the restoring force of the one-stage spring assembly and the two-stage spring assembly, the brake pedal returns to its original position.

[0015] Therefore, the present invention adopts the above-mentioned braking system and braking method integrating hydraulic damping pedal feel and mechanical backup, and the beneficial effects are as follows: 1. Optimize the pedal experience: Adopt a lever and multi-stage wire spring mechanical structure to achieve a small stroke and large damping, non-linear pedal feel; The multi-stage spring is coupled with the hydraulic damping to improve the driving and riding experience; It can also meet the pedal feel requirements of various vehicle models by adjusting the lever ratio and spring stiffness, so that the pedal assembly can withstand a damping force of more than 3000N; 2. Ensure functional safety: Integrate multiple angle sensors to achieve redundant and accurate output of pedal displacement, meeting the future functional safety requirements of driverless driving; 3. Reduce the overall weight: The main structure is designed with lightweight modified engineering plastics to reduce the overall weight while ensuring high strength; 4. Reduce the adaptation cost: Adopt an interface platform design, and only adjust the connection plate interface to match the installation of different vehicle models, with a cost advantage; 5. Ensure reliable braking: The reservoir provides hydraulic damping feeling and reduces noise, and can provide braking during mechanical backup; the one-way solenoid valve opens during mechanical backup to input hydraulic braking pressure into the caliper, ensuring the reliability of the braking system.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0017] Figure 1 is a cross-sectional view of the braking system integrating hydraulic damping pedal feeling and mechanical backup according to the present invention; Figure 2 is an external view of the braking system integrating hydraulic damping pedal feeling and mechanical backup according to the present invention.

[0018] Reference Signs 1. Mounting shell; 2. Hydraulic backup component; 3. Primary lever component; 4. Pressure wheel; 5. Rear cover; 6. Brake pedal; 7. Vibration damping pad; 8. First-stage spring component; 9. Secondary lever component; 10. Support seat; 11. Fulcrum; 12. One-way solenoid valve; 13. Firewall component; 14. Second-stage spring component; 15. Corner sensor. Detailed Embodiments

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of this application. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end.

[0020] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or server that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] As Figure 1As shown in the figure, a braking system integrating hydraulic damping pedal feel and mechanical backup includes a brake pedal 6. The power output end of the brake pedal 6 is aligned with one end of a secondary lever assembly 9 through a primary lever assembly 3 and a first-stage spring assembly 8 in sequence. The other end of the secondary lever assembly 9 is aligned with a hydraulic backup assembly 2 through a second-stage spring assembly 14. The hydraulic backup assembly 2 is connected to four brake wheel cylinders through pipelines, and a one-way solenoid valve 12 that conducts unidirectionally towards the brake wheel cylinders is arranged on the pipelines. The stiffness of the first-stage spring assembly 8 is greater than that of the second-stage spring assembly 14. The force arm length of the primary lever assembly 3 is less than that of the secondary lever assembly 9. A fulcrum 11 is arranged at one end of the secondary lever assembly 9 close to the first-stage spring assembly 8. The fulcrum 11 is vertically rotatably connected to the mounting shell 1 through a support seat to amplify the pedal feedback force.

[0023] A pressure wheel 4 is vertically rotatably connected to the power output position of the brake pedal 6 through a rotating shaft. The pressure wheel 4 is in rolling contact with one end of the primary lever assembly 3. The other end of the primary lever assembly 3 is vertically rotatably connected to the fulcrum 11. The rotating connection between the primary lever assembly 3 and the fulcrum 11 is coaxial with the rotating connection between the fulcrum 11 and the mounting shell 1. In the initial state, one end of the primary lever assembly 3 close to the pressure wheel 4 is connected to the power input end of the secondary lever assembly 9 through the first-stage spring assembly 8, and the first-stage spring assembly 8 and the pressure wheel 4 are respectively arranged on both sides of the primary lever assembly 3, as Figure 2 shown. Through the above structure, when the stroke of the depressed brake pedal 6 advances, the closer the pressure wheel 4 is to the fulcrum 11 (the pressure wheel 4 rolls on the primary lever assembly 3), the greater the pedal feedback force, improving the pedal feel.

[0024] The hydraulic backup assembly 2 is a liquid reservoir. The power output end of the secondary lever assembly 9 is connected to one end of the second-stage spring assembly 14. The other end of the second-stage spring assembly 14 is connected to the power input end of the liquid reservoir. The oil outlet end of the liquid reservoir is connected to one end of the main pipeline. The other end of the main pipeline is respectively connected to four brake wheel cylinders through four branch pipelines.

[0025] One end of the brake pedal 6 is fixedly connected to the brake pedal 6, and the other end extends into the mounting shell 1 and is vertically rotatably connected to the inner wall of the mounting shell 1. Angle sensors 15 are arranged at the rotating connection between the brake pedal 6 and the mounting shell 1 and at the rotating connection between the fulcrum 11 and the support seat 10. The angle sensors 15 are connected to the brake wheel cylinders through a domain control ECU, and are used to control the brake wheel cylinders to execute braking forces matching the rotation angle according to the rotation angle of the brake pedal 6 collected by the angle sensors 15. The on-vehicle fault monitoring module is electrically connected to the one-way solenoid valve 12 through the domain control ECU, and is used to open the one-way solenoid valve 12 for braking backup when a mechanical braking fault is detected. The one-way solenoid valve 12 is a normally closed solenoid valve.

[0026] One side of the mounting shell 1 is fixedly provided with a rear cover 5. There is a perforation left between the rear cover 5 and the mounting shell 1. The brake pedal 6 penetrates into the mounting shell 1 through the perforation opened on the mounting shell 1. A damping pad 7 is provided on the side of the mounting shell 1 facing the brake pedal 6 and on the side of the rear cover 5 facing the brake pedal 6, which is used to reduce the noise generated when the brake pedal 6 collides with the perforation wall during braking.

[0027] The force relationship formula of the first-stage spring assembly 8 and the second-stage spring assembly 14 is , where and are respectively the force generated by the first-stage spring assembly 8 and the corresponding force arm, and are respectively the force generated by the second-stage spring assembly 14 and the corresponding force arm, and ; The lever ratio of the end of the secondary lever assembly 9 close to the first-stage spring assembly 8 to the end of the secondary lever assembly 9 close to the second-stage spring assembly 14 is , is the forward displacement generated by the pressing wheel 4 following the braking of the brake pedal 6. Through the above settings, during braking, the brake pedal 6 moves, compressing the first-stage spring assembly 8 downward until the first-stage spring assembly 8 coils, and under the action of the secondary lever assembly 9, compressing the second-stage spring assembly 14, and with the effect of the variable lever ratio (the rolling of the pressing wheel 4 causes the lever ratio to change), increasing the feedback force, meeting the design requirements of the pedal feel curve.

[0028] The other side of the mounting shell 1 is connected to the firewall assembly 13. The firewall assembly 13 is detachably connected to the vehicle firewall through a press rivet screw. The detachable connection method can adapt to different vehicle models by replacing different firewall assemblies 13, broadening the ductility.

[0029] The mounting shell 1, the brake pedal 6, the support seat 10, the primary lever assembly 3 and the secondary lever assembly 9 are all injection molded from PBT + GF30%, achieving lightweight settings while reducing costs.

[0030] The braking method of the braking system based on integrating hydraulic damping pedal feel and mechanical backup includes a braking stage and a release stage; In the braking stage, under normal conditions, the one-way solenoid valve 12 is in the closed state for mechanical braking. At this time, when the brake pedal 6 is depressed, the brake pedal 6 rotates downward, presses the primary lever assembly 3 downward through the pressing wheel 4, and then presses one end of the secondary lever assembly 9 downward through the first-stage spring assembly 8. At this time, under the action of the fulcrum 11, the other end of the secondary lever assembly 9 compresses the second-stage spring assembly 14 to amplify the pedal feedback force; at the same time, the rotation angle sensor 15 collects the rotation angle of the brake pedal 6 and transmits the angle signal to the domain control ECU. The domain control ECU converts it into a braking force drive command and sends it to the EMB. The EMB drives the brake wheel cylinder to generate the corresponding braking force for braking; In the fault state, after the fault monitoring module detects a mechanical braking fault, it opens the one-way solenoid valve 12, and the pedal force drives the hydraulic oil in the reservoir to be output to the brake wheel cylinder to achieve hydraulic braking backup; In the release stage, when the brake pedal 6 is released, under the restoring force of the first-stage spring assembly 8 and the second-stage spring assembly 14, the brake pedal 6 returns to its original position.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A brake system with integrated hydraulic damping pedal feel and mechanical backup, including a brake pedal, characterized in that: The power output end of the brake pedal is aligned with one end of the secondary lever assembly through the primary lever assembly and the first-stage spring assembly in sequence, and the other end of the secondary lever assembly is aligned with the hydraulic backup assembly through the second-stage spring assembly. The hydraulic backup assembly is connected to the four brake wheel cylinders through pipelines, and a one-way solenoid valve that conducts unidirectionally toward the brake wheel cylinder is provided on the pipeline; The stiffness of the first-stage spring assembly is greater than that of the second-stage spring assembly, the arm length of the primary lever assembly is less than the arm length of the secondary lever assembly, and a fulcrum is provided at one end of the secondary lever assembly close to the first-stage spring assembly, and the fulcrum is vertically rotatably connected to the mounting shell via a support seat to amplify the pedal feedback force.

2. The brake system with integrated hydraulic damping pedal feel and mechanical backup according to claim 1, characterized in that: The power output position of the brake pedal is vertically connected to a pressure wheel through a rotating shaft, the pressure wheel is in rolling contact with one end of the primary lever assembly, the other end of the primary lever assembly is vertically connected to a fulcrum, and the fulcrum is connected to a support seat fixed on the inner wall of the mounting shell; In the initial state, one end of the primary lever assembly close to the pressure wheel is connected to the power input end of the secondary lever assembly via a spring assembly, and the spring assembly and the pressure wheel are disposed on both sides of the primary lever assembly.

3. The brake system with integrated hydraulic damping pedal feel and mechanical backup according to claim 2, characterized in that: The hydraulic backup component is a reservoir; The power output end of the secondary lever assembly is connected to one end of the two-stage spring assembly, the other end of the two-stage spring assembly is connected to the power input end of the reservoir, the oil outlet end of the reservoir is connected to one end of the main pipeline, and the other end of the main pipeline is connected to four brake wheel cylinders through four branch pipelines.

4. The brake system with integrated hydraulic damping pedal feel and mechanical backup according to claim 3, characterized in that: Angle sensors are provided at the rotational connection between the brake pedal and the mounting shell, and at the rotational connection between the fulcrum and the support seat. The angle sensors are connected to the brake wheel cylinder via the domain control ECU, and are used to control the brake wheel cylinder to execute a braking force that matches the rotation angle according to the rotation angle of the brake pedal collected by the angle sensor. The vehicle-mounted fault monitoring module is electrically connected to the one-way solenoid valve via the domain control ECU, and is used to open the one-way solenoid valve for brake backup when a mechanical brake fault is detected; The one-way solenoid valve is a normally closed solenoid valve.

5. The brake system with integrated hydraulic damping pedal feel and mechanical backup according to claim 4, characterized in that: A rear cover is fixed to one side of the mounting shell, a through hole is left between the rear cover and the mounting shell, the brake pedal penetrates into the mounting shell through the through hole opened on the mounting shell, and a vibration-damping pad is provided on the side of the mounting shell facing the brake pedal and on the side of the rear cover facing the brake pedal, so as to reduce the noise generated when the brake pedal collides with the through hole wall during braking.

6. The brake system with integrated hydraulic damping pedal feel and mechanical backup according to claim 4, characterized in that: The force relationship between the first-stage spring assembly and the second-stage spring assembly is: ,in and They are the force generated by a section of spring assembly and the corresponding lever arm, and are the forces generated by the two-stage spring assembly and the corresponding lever arms, and ; The lever ratio of the secondary lever assembly near the first spring assembly and the secondary lever assembly near the second spring assembly , It is the forward displacement of the pressure wheel caused by the braking of the brake pedal.

7. The brake system with integrated hydraulic damping pedal feel and mechanical backup according to claim 4, characterized in that: The other side of the mounting shell is connected to the firewall assembly, and the firewall assembly is detachably connected to the entire vehicle firewall via pressure rivet screws.

8. The brake system with integrated hydraulic damping pedal feel and mechanical backup according to claim 4, characterized in that: The mounting shell, brake pedal, support seat, primary lever assembly and secondary lever assembly are all made of PBT+GF30% injection molding.

9. A braking method of a braking system with integrated hydraulic damping pedal feel and mechanical backup according to any one of claims 4 to 8, characterized in that: It includes the braking phase and the releasing phase; In the braking stage, under normal conditions, the one-way solenoid valve is in a closed state, and mechanical braking is performed. At this time, the brake pedal is stepped on and rotated downward, and the primary lever assembly is pressed downward through the pressure wheel, and then one end of the secondary lever assembly is pressed downward through a spring assembly. At this time, under the action of the fulcrum, the other end of the secondary lever assembly compresses the second-stage spring assembly to amplify the pedal feedback force; at the same time, the angle sensor collects the rotation angle of the brake pedal and transmits the angle signal to the domain control ECU, which converts it into a braking force drive command and sends it to the EMB, and the EMB drives the brake wheel cylinder to generate corresponding braking force for braking; In the fault state, after the fault monitoring module detects a mechanical brake fault, it opens the one-way solenoid valve, and the pedal force drives the hydraulic oil in the reservoir to be output to the brake wheel cylinder to achieve hydraulic brake backup; During the release phase, the brake pedal is released and the brake pedal is reset under the action of the restoring force of the first-stage spring assembly and the second-stage spring assembly.

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