Design method of brake assist assembly and brake assist assembly

Abstract

The application discloses a design method of a brake assisting assembly and the brake assisting assembly, and relates to the field of brake pedals. The brake assisting assembly comprises a mounting frame, a pedal mechanism and an assisting mechanism. A pedal arm of the pedal mechanism is connected with a pedal pad, and the pedal arm is further rotationally connected to the mounting frame. The assisting mechanism comprises an assisting push rod rotationally connected with the pedal arm. When the brake assisting assembly is designed, the self weight of the pedal mechanism or pressure generated by other structures can affect the return effect of the pedal arm. By comparing the residual pressure of the pedal mechanism applied to the assisting push rod with the return force of the pedal arm applied to the assisting push rod, it can be quickly determined whether the return effect of the pedal arm is qualified, a relatively reasonable judgment standard can be provided for the design of the size of the return force, and the design of the return force of the pedal mechanism is simplified. Meanwhile, the pedal mechanism does not have a return spring, so that the pedal mechanism can be simplified and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of brake pedal technology, and in particular to a design method for a brake assist component and a brake assist component. Background Technology

[0002] There are two main ways for a car's brake pedal to automatically return to its original position after being pressed. The first is through a return spring in the assist mechanism, and the second is through a pedal with its own adjustable spring, which still requires the assistance of a spring in the assist mechanism. Using the pedal with its own adjustable spring complicates the pedal's structure and increases cost. With the first method, it's difficult to control the pedal's return force during the design phase, potentially leading to insufficient force, delayed pedal return, a "not keeping the pedal in place" phenomenon, and residual braking torque, which reduces the lifespan of the brake pads. Furthermore, existing designs are often based on experience, lacking relevant design specifications, further complicating pedal design. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a design method for a brake assist component, which does not have a return spring, and the design method can provide a more reasonable judgment standard for the magnitude of the return force, thereby simplifying the design of the return force.

[0004] The present invention also proposes a braking assist component manufactured using the above-described design method.

[0005] According to a design method for a brake assist assembly based on a first aspect of the present invention, the brake assist assembly includes: a mounting bracket; a pedal mechanism including a pedal arm and a pedal pad, one end of the pedal arm being connected to the pedal pad and the other end of the pedal arm being rotatably connected to the mounting bracket; and an assist mechanism including an assist push rod, one end of the assist push rod being rotatably connected to the pedal arm.

[0006] The design method includes:

[0007] Obtain the residual pressure applied by the pedal mechanism to the booster push rod;

[0008] The return force applied to the pedal arm by the booster push rod is obtained, and the direction of the return force is opposite to the direction of the residual pressure;

[0009] Compare the magnitudes of the return force and the residual pressure;

[0010] When the return force is greater than the residual pressure, the return effect of the pedal mechanism is deemed to be qualified.

[0011] When the return force is less than or equal to the residual pressure, the return effect of the pedal mechanism is deemed unqualified. The residual pressure is reduced and / or the return force is increased until the return force is greater than the residual pressure.

[0012] The design method of the brake assist component according to embodiments of the present invention has at least the following beneficial effects:

[0013] When the user presses the brake pedal, the pedal pad causes the pedal arm to swing around the mounting bracket, thus moving the booster push rod of the brake assist mechanism and ultimately braking the wheels. After releasing the brake, the brake assist mechanism generates a return force to reset the pedal arm, which is then applied to the pedal arm via the booster push rod. In designing the brake assist assembly, the weight of the pedal mechanism or pressure from other structures can affect the pedal arm's return performance. Therefore, the residual pressure exerted by the pedal mechanism on the booster push rod is compared with the return force exerted by the booster push rod on the pedal arm. When the return force is greater than the residual pressure, the pedal mechanism's return performance is satisfactory, the pedal arm returns smoothly, reducing residual braking torque and extending the lifespan of the brake pads. When the return force is less than or equal to the residual pressure, the pedal arm cannot return, and the return performance is unsatisfactory. This can be addressed by reducing the residual pressure or increasing the return force to ensure a proper return performance. The above design method provides a more reasonable criterion for judging the magnitude of the return force, simplifying the design of the return force of the pedal mechanism. Furthermore, the pedal mechanism itself does not include a return spring, simplifying the mechanism and reducing production costs.

[0014] According to some embodiments of the present invention, obtaining the residual pressure applied by the pedal mechanism to the booster push rod includes:

[0015] The total weight of the pedal mechanism is defined as G;

[0016] The brake assist component is processed to satisfy the following: on the projection plane perpendicular to the rotation axis of the pedal arm, let the rotation center point of the mounting bracket and the pedal arm rotation connection be point A, the centroid of the pedal mechanism be point B, and the shortest distance between the straight line passing through point A and parallel to the moving direction of the booster push rod and point B be L1.

[0017] Define the rotation center point at the rotatable connection between the booster push rod and the pedal arm as point C, and define the shortest distance between the straight line parallel to the moving direction of the booster push rod and passing through point C and point A as L2;

[0018] Define α as the angle between the line connecting point A and point B and the direction of the total weight G of the pedal mechanism;

[0019] The residual pressure is calculated by including the pressure F1 applied to the booster push rod by the total weight G of the pedal mechanism, satisfying: F1=tanα*G*L1 / L2.

[0020] According to some embodiments of the present invention, the method for reducing residual pressure includes any one or more of the following:

[0021] Reduce the overall weight of the pedal mechanism;

[0022] Change the position of the center of mass of the pedal mechanism;

[0023] Increase the distance between point B and the straight line passing through point A and parallel to the direction of movement of the booster push rod.

[0024] According to some embodiments of the present invention, the pedal mechanism further includes a bracket and a switch trigger piece, the bracket being fixedly connected to the pedal arm, and the switch trigger piece being connected to the bracket. The design method further includes:

[0025] The total weight G of the pedal mechanism is obtained by calculating the sum of the weights of the pedal arm, the pedal pad, the switch trigger piece, and the bracket.

[0026] According to some embodiments of the present invention, the pedal mechanism further includes a resilient switch trigger piece, and obtaining the residual pressure applied by the pedal mechanism to the booster push rod includes:

[0027] The elastic force applied to the pedal arm by the switch trigger piece is defined as F3;

[0028] The brake assist component is processed to satisfy the following: on the projection plane perpendicular to the rotation axis of the pedal arm, let the rotation center point of the mounting bracket and the pedal arm rotation connection be point A, and the shortest distance from the straight line coinciding with the direction of the force F3 applied to the pedal arm to point A be L3.

[0029] The rotation center of the connection between the booster push rod and the pedal arm is defined as point C, and the distance between point A and point C is L4.

[0030] Define the angle β between the straight line that coincides with the direction of the force applied to the pedal arm by F3 and the direction of movement of the booster push rod;

[0031] The residual pressure is calculated by including the pressure F2 applied by the switch trigger plate to the booster push rod, which satisfies: F2=cosβ*(F3*L3 / L4).

[0032] According to some embodiments of the present invention, the method for reducing residual pressure includes any one or more of the following:

[0033] Change the direction of the force applied by F3 to the pedal arm;

[0034] Increase the distance between point A and point C;

[0035] Change the direction of movement of the booster push rod.

[0036] According to some embodiments of the present invention, the assist mechanism further includes a return spring for providing the return force to the assist push rod, and the method for increasing the return force includes:

[0037] Replace with a return spring that has a higher elastic coefficient.

[0038] According to some embodiments of the present invention, the return force is F4, which satisfies: 25N≤F4≤35N.

[0039] According to a second aspect of the present invention, the brake assist component is manufactured using the design method of the brake assist component described in the above embodiments.

[0040] The brake assist assembly according to embodiments of the present invention has at least the following beneficial effects:

[0041] When the user presses the brake pedal, the pedal pad causes the pedal arm to swing around the mounting bracket, thus moving the booster push rod of the brake assist mechanism and ultimately braking the wheels. After releasing the brake, the brake assist mechanism generates a return force to reset the pedal arm, which is then applied to the pedal arm via the booster push rod. In designing the brake assist assembly, the weight of the pedal mechanism or pressure from other structures can affect the pedal arm's return performance. Therefore, the residual pressure exerted by the pedal mechanism on the booster push rod is compared with the return force exerted by the booster push rod on the pedal arm. When the return force is greater than the residual pressure, the pedal mechanism's return performance is satisfactory, the pedal arm returns smoothly, reducing residual braking torque and extending the lifespan of the brake pads. When the return force is less than or equal to the residual pressure, the pedal arm cannot return, and the return performance is unsatisfactory. This can be addressed by reducing the residual pressure or increasing the return force to ensure a proper return performance. The above design method provides a more reasonable criterion for judging the magnitude of the return force, simplifying the design of the return force of the pedal mechanism. Furthermore, the pedal mechanism itself does not include a return spring, simplifying the mechanism and reducing production costs.

[0042] According to some embodiments of the present invention, the mounting bracket includes a rotating shaft, a connecting plate, and two side plates, the two side plates being spaced apart, the connecting plate being connected between the two side plates, the rotating shaft and the connecting plate being spaced apart and fixedly connected between the two side plates, and the pedal arm being rotatably connected to the rotating shaft.

[0043] According to some embodiments of the present invention, the assist mechanism further includes a vacuum booster and a brake master cylinder. The vacuum booster is connected between the brake master cylinder and the booster push rod. An avoidance groove for avoiding the booster push rod is formed between the two side plates. The booster push rod passes through the avoidance groove, and both side plates are fixedly connected to the vacuum booster.

[0044] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0046] Figure 1 This is a schematic diagram of the structure of a braking assist component according to an embodiment of the present invention;

[0047] Figure 2 This is a side view of a brake assist assembly according to an embodiment of the present invention;

[0048] Figure 3 yes Figure 2 The enlarged view at point A shows the force analysis diagram of the total weight of the pedal mechanism on the booster push rod;

[0049] Figure 4 yes Figure 2 The enlarged view at point A shows the force analysis diagram of the elastic force of the switch trigger plate on the booster push rod;

[0050] Figure 5 This is a schematic diagram of the braking assist component from another perspective of one embodiment of the present invention.

[0051] Figure 6 This is a flowchart of a design method according to an embodiment of the present invention;

[0052] Figure 7 This is a flowchart of a method for calculating residual pressure according to an embodiment of the present invention;

[0053] Figure 8 This is a flowchart of a method for calculating residual pressure according to another embodiment of the present invention.

[0054] Figure label:

[0055] Brake booster assembly 1000;

[0056] Mounting bracket 100; connecting plate 110; side plate 120; clearance groove 121; rotating shaft 130;

[0057] 200; pedal mechanism; 210; pedal pad; 220; brake light switch; 230; switch trigger plate; 231; bracket;

[0058] Assist mechanism 300; booster push rod 310; vacuum booster 320; brake master cylinder 330. Detailed Implementation

[0059] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0060] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0061] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0062] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0063] Reference Figure 1As shown, a brake booster assembly 1000 according to an embodiment of the present invention can be used in an automobile to achieve braking. The brake booster assembly 1000 of this embodiment includes: a mounting bracket 100, a pedal mechanism 200, and a booster mechanism 300. The pedal mechanism 200 includes a pedal arm 210 and a pedal pad 220. One end of the pedal arm 210 is fixedly connected to the pedal pad 220, and the other end of the pedal arm 210 is rotatably connected to the mounting bracket 100. Therefore, when the pedal pad 220 is depressed, the pedal arm 210 can swing around the mounting bracket 100. The booster mechanism 300 includes a booster push rod 310, a vacuum booster 320, and a brake master cylinder 330. One end of the booster push rod 310 is rotatably connected to the pedal arm 210 and located between the pedal pad 220 and the mounting bracket 100. The other end of the booster push rod 310 is connected to the vacuum booster 320, which is then connected to the brake master cylinder 330. Therefore, when the pedal arm 210 is depressed, the booster push rod 310 can be moved.

[0064] Understandably, the force generated when the user presses the pedal pad 220 is relatively small, insufficient to effectively brake a car traveling at high speed. Therefore, a brake assist mechanism 300 is needed to increase brake assist for effective braking. When the user presses the pedal pad 220, it causes the pedal arm 210 to swing, thereby pushing the booster push rod 310 to move. This causes the negative pressure inside the vacuum booster 320 to push the piston inside the brake master cylinder 330 to move, generating hydraulic pressure. The hydraulic pressure is transmitted to the brake through the brake lines, causing the brake pads to clamp the brake disc, thus achieving the braking effect.

[0065] After the user releases the pedal pad 220, both the pedal pad 220 and the pedal arm 210 need to return to their original position. There are two ways to return to their original position. The first is that the pedal mechanism 200 itself does not have a spring, and it relies on the push force of the return spring of the vacuum booster 320 to return to its original position. However, due to the relatively complex structure of the vacuum booster 320, adjusting the pedal feel and return feel of the pedal pad 220 is quite difficult. Therefore, in the second method, the pedal mechanism 200 itself has a spring. Although it still needs the push force of the return spring of the vacuum booster 320 to assist in returning to its original position, the pedal feel and return feel of the pedal pad 220 can be easily adjusted by adjusting the installation position and elasticity of the spring itself. When using the second method, the structure of the pedal mechanism 200 needs to be adapted to the design of the return spring, which can easily lead to a more complex structure of the pedal mechanism 200 and an increase in production costs. When the pedal mechanism 200 itself does not use a return spring design, there is no corresponding judgment standard, and the design is usually based on experience, which increases the difficulty of designing for different car models.

[0066] In order to provide a more reasonable return judgment standard during the automotive design and development phase, when the pedal mechanism 200 itself does not have a return spring, refer to Figure 6As shown, a design method according to one embodiment of the present invention includes:

[0067] Step S601: Obtain the residual pressure applied by the pedal mechanism 200 to the booster push rod 310. The residual pressure can be generated by the weight of the pedal mechanism 200 itself or by the switch trigger 231 of the brake light switch 230. Taking the residual pressure generated by the weight of the pedal mechanism 200 itself as an example, after the user releases the brake, the pedal arm 210 resets under the action of the booster push rod 310. During the reset, it needs to overcome the residual pressure generated by the weight of the pedal mechanism 200 itself in order to return to its original position smoothly.

[0068] Step S602: Obtain the return force applied by the booster push rod 310 to the pedal arm 210. The direction of the return force is opposite to the direction of the residual pressure. A return spring is provided between the booster push rod 310 and the vacuum booster 320. The return spring can provide the booster push rod 310 with the return force to drive the pedal arm 210 to reset. The return force refers to the maximum elastic force that the return spring can provide when the pedal pad 220 is pressed to its maximum extent and is in its maximum compressed state. Alternatively, in another embodiment, the maximum elastic force that the return spring can generate can be directly used as the return force.

[0069] Step S603: Compare the magnitudes of the return force and the residual pressure. Since the direction of the residual pressure is opposite to the direction of the return force, it is necessary to compare their magnitudes to determine whether the pedal arm 210 can return smoothly.

[0070] Step S604: When the return force is greater than the residual pressure, it is determined that the return effect of the pedal mechanism 200 is qualified, that is, the pedal arm 210 can be successfully reset, reducing or avoiding the situation where the pedal arm 210 cannot be reset to the initial position after the pedal pad 220 is released.

[0071] Step S605: When the return force is less than or equal to the residual pressure, it is determined that the return effect of the pedal mechanism 200 is unqualified. That is, after releasing the pedal pad 220, the pedal arm 210 cannot return to the initial position, causing the car to always be in a braking state, which can easily cause residual braking torque and reduce the life of the brake friction pads.

[0072] Step S606: Reduce residual pressure and / or increase return force. For example, the residual pressure can be reduced by reducing the weight of the pedal mechanism 200, or the return force can be increased by increasing the stiffness of the return spring. Then return to the step of comparing the magnitude of the return force and the residual pressure until the return force is greater than the residual pressure.

[0073] Understandably, by acquiring the return force and residual pressure and comparing their magnitudes, it is possible to quickly determine whether the pedal arm 210 can return smoothly. This design method provides a more reasonable judgment standard, simplifying the design of the return force of the pedal mechanism 200. Furthermore, by rationally designing the difference between the return force and residual pressure, it is possible to ensure that the pedal arm 210 can return quickly and reliably even without a return spring, simplifying the pedal structure, reducing costs, and minimizing issues such as untimely pedal return and lack of "feel" when the pedal is not in contact with the foot.

[0074] Since the weight of the pedal mechanism 200 will hinder the reset of the pedal arm 210, therefore, referring to Figure 2 , Figure 3 and Figure 7 As shown, in an embodiment of the present invention, step S601 includes the following steps:

[0075] Step S701: Define the total weight of the pedal mechanism 200 as G, with G pointing vertically downwards.

[0076] Step S702: Process the brake booster assembly 1000 to satisfy the following: On the projection plane perpendicular to the rotation axis of the pedal arm 210, let the rotation center point at the rotational connection between the mounting bracket 100 and the pedal arm 210 be point A, and the center of mass of the pedal mechanism 200 be point B. The shortest distance between the straight line S1 passing through point A and parallel to the moving direction of the booster push rod 310 and point B is L1.

[0077] Step S703: Define the rotation center point at the rotatable connection between the booster push rod 310 and the pedal arm 210 as point C, and the shortest distance between point A and the straight line S2 parallel to the moving direction of the booster push rod 310 and passing through point C is L2.

[0078] Step S704: Define the angle α between the line S3 connecting points A and B and the direction of G.

[0079] Step S705: Calculate the residual pressure, including the pressure F1 applied to the booster push rod 310 by the total weight G of the pedal mechanism 200, satisfying: F1=tanα*G*L1 / L2. The direction of F1 is opposite to the direction of the return force, which is the direction of movement of the drive pedal arm 210 of the booster push rod 310 when it resets. Therefore, F1 will hinder the reset of the pedal arm 210.

[0080] It is understandable that F5 = tanα * G, where F5 is the force exerted by the total weight G of the pedal mechanism 200 at point B in a direction parallel to S2. Converting F5 to the force at point C, according to the lever principle, we get F1 = F5 * L1 / L2, or F1 = tanα * G * L1 / L2. Therefore, the above formula allows us to calculate the pressure exerted by the total weight G of the pedal mechanism 200 on the booster push rod 310, thus facilitating the determination of the return force and reducing or avoiding situations where F1 is greater than or equal to the return force, causing the pedal arm 210 to fail to return to its original position. It also facilitates the design of the difference between the return force and F1, thereby easily adjusting the pedal feel and return feel of the pedal pad 220.

[0081] It should be noted that during the design phase, the pedal mechanism 200 is typically designed using 3D modeling. After pre-setting the material of the pedal mechanism 200, parameters such as weight and center of gravity can be automatically calculated. For example, the total weight of the pedal mechanism 200 is the sum of the weights of the pedal arm 210 and the pedal pad 220. The pedal arm 210 is set to be made of cast iron, and the pedal pad 220 is set to be made of rubber. Then, software such as CATIA, SolidWorks, and UG is used to calculate the center of gravity of the pedal arm 210 and pedal pad 220 combined.

[0082] When the brakes are applied, the car's brake lights illuminate to alert following vehicles. These brake lights are typically controlled by a brake light switch 230; that is, when the brakes are applied, the brake light switch 230 activates the brake lights. (See reference...) Figure 2 and Figure 3 As shown, in an embodiment of the present invention, the pedal mechanism 200 further includes a switch trigger piece 231 and a bracket 240. The bracket 240 and the pedal arm 210 are fixedly connected, for example by welding, or by fasteners such as screws or bolts. The switch trigger piece 231 is typically made of silicone or rubber, thus possessing elasticity, and is inserted into the mounting hole of the bracket 240. When the pedal pad 220 is not depressed, one end of the brake light switch 230 abuts against the switch trigger piece 231, causing one side of the switch trigger piece 231 to be recessed. When the pedal pad 220 is depressed, the pedal arm 210 swings and, through the bracket 240, causes the switch trigger piece 231 and one end of the brake light switch 230 to separate, thus turning on the brake light. After the pedal pad 220 is released, the pedal arm 210 needs to overcome the elastic force of the switch trigger piece 231 during its return process to ensure that the pedal arm 210 can return to the corresponding position.

[0083] It is understandable that, since the bracket 240 is fixedly connected to the pedal arm 210, and the switch trigger piece 231 is disposed on the bracket 240, the weight of the bracket 240 and the switch trigger piece 231 will affect the return effect of the pedal arm 210. Therefore, in the embodiments of the present invention, the total weight G of the pedal mechanism 200 refers to the sum of the weights of the pedal arm 210, the pedal pad 220, the bracket 240, and the switch trigger piece 231. It should be noted that when the pedal arm 210 is provided with other structures, and the weight of these structures will affect the return effect of the pedal arm 210, then G is the sum of the weights of all structures that will affect the return effect of the pedal arm 210. In another embodiment, the pedal mechanism 200 may also include the switch trigger piece 231 but not the bracket 240, that is, the switch trigger piece 231 is directly connected to the pedal arm 210. In this case, the total weight of the pedal mechanism 200 can be calculated by summing the weights of the pedal arm 210, the pedal pad 220, and the switch trigger piece 231.

[0084] It should be noted that, in another embodiment, the brake light switch 230 can be triggered not only by the switch trigger piece 231, but also by a Hall sensor or similar means. That is, the bracket 240 and the switch trigger piece 231 are eliminated. In this case, G can only include the sum of the weights of the pedal arm 210 and the pedal pad 220, and the residual pressure is F1. That is, when the booster push rod 310 pushes the pedal arm 210 to reset, it is only affected by the weight of the pedal mechanism 200 itself.

[0085] When using the switch trigger piece 231, because the switch trigger piece 231 is elastic, the pedal arm 210 needs to overcome the elastic force of the switch trigger piece 231 when resetting. Therefore, refer to Figure 4 and Figure 8 As shown, in an embodiment of the present invention, step S601 further includes the following steps:

[0086] Step S801: Define the elastic force F3 applied by the switch trigger piece 231 to the pedal arm 210. It can be understood that after releasing the brake, the pedal arm 210 needs to overcome the elastic force F3 applied by the switch trigger piece 231 during the reset process. It should be noted that the switch trigger piece 231 is a relatively mature product, and its elastic force is usually indicated when selecting a model; this indicated elastic force is F3. Alternatively, after releasing the pedal pad 220, one end of the brake light switch 230 comes into contact with the switch trigger piece 231, causing the switch trigger piece 231 to deform. In this case, the elastic force F3 applied by the switch trigger piece 231 to the pedal arm 210 can be calculated using Hooke's Law based on the amount of deformation of the switch trigger piece 231 and its corresponding elastic coefficient.

[0087] Step S802: Process the brake assist assembly 1000 to satisfy the following: on the projection plane perpendicular to the rotation axis of the pedal arm 210, let the rotation center point at the rotational connection between the mounting bracket 100 and the pedal arm 210 be point A, and the shortest distance from the straight line coinciding with the direction of the force F3 applied to the pedal arm 210 to point A be L3.

[0088] Step S803: Define the rotation center at the rotatable connection between the booster push rod 310 and the pedal arm 210 as point C, and the distance between point A and point C as L4.

[0089] Step S804: Define the angle β between the straight line coinciding with the direction of the force applied to the pedal arm 210 by F3 and the direction of movement of the booster push rod 310. For example, according to the lever principle, the force of F3 converted to point C is F6, F6 = F3 * L3 / L4, and the angle β between F6 and F2 is β.

[0090] Step S805: Calculate the residual pressure, including the pressure F2 applied by the switch trigger piece 231 to the booster push rod 310, which satisfies: F2=cosβ*(F3*L3 / L4). The direction of F2 is opposite to the direction of the return force, which is the direction in which the drive pedal arm 210 of the booster push rod 310 moves when it resets.

[0091] It is understandable that the residual pressure includes F1 and F2, and the return force is denoted as F4, requiring F4 > F1 + F2. Since the booster push rod 310 needs to overcome the total weight G of the pedal mechanism 200 and the elastic force of the switch trigger plate 231 when pushing the pedal arm 210 back, the residual pressure on the booster push rod 310 caused by the total weight G of the pedal mechanism 200 and the elastic force of the switch trigger plate 231 can be calculated using the formula. Then, the magnitude of the return force F4 provided by the return spring to the booster push rod 310 for reset can be calculated, which makes it easy to determine whether the pedal arm 210 can be successfully reset.

[0092] In the embodiments of the present invention, F4 satisfies: 25N ≤ F4 ≤ 35N. The return spring within the vacuum booster 320 typically comes in several models, each with a corresponding spring force, such as 25N, 30N, and 35N. Depending on the selected return spring model, the spring force specified for that model can be directly used as the return force for calculation.

[0093] In embodiments of the present invention, after obtaining the return force and residual pressure, if a comparison reveals that the residual pressure is greater than or equal to the return force, the residual pressure can be reduced specifically, or the return force can be directly increased, according to the formulas F1=tanα*G*L1 / L2 and F2=cosβ*(F3*L3 / L4). For example, any one or more of the following methods can be used to make the return force greater than the residual pressure:

[0094] The first approach is to reduce the overall weight of the pedal mechanism 200. This can be achieved by using a lighter pedal arm 210 or pedal pad 220, or by eliminating designs such as the bracket 240, to reduce the impact of the overall weight of the pedal mechanism 200 on the reset of the pedal arm 210.

[0095] The second method involves changing the position of the center of gravity of the pedal mechanism 200. The position of the center of gravity affects the magnitudes of α and L1. By changing the weight and positional relationship between the pedal arm 210 and the pedal pad 220, the position of the center of gravity can be altered, thereby reducing residual pressure.

[0096] The third method is to increase the distance between line S1 and point C, i.e., increase L2. According to F1 = tanα * G * L1 / L2, the larger L2 is, the smaller F1 is. Therefore, F1 can be reduced by moving the connection position between the booster push rod 310 and the pedal arm 210 downwards.

[0097] The fourth method is to change the direction of the force F3 applies to the pedal arm 210, thereby reducing L3 and consequently reducing F2. For example, the direction of F3 can be changed by altering the position of the switch trigger piece 231.

[0098] The fifth method is to increase the distance between points A and C, i.e., increase L4. According to F2=cosβ*(F3*L3 / L4), the larger L4 is, the smaller F2 is.

[0099] The sixth method: change the direction of movement of the booster push rod 310. Figure 5 The push rod 310 shown moves in the forward and backward direction. Within the range of 0° to 90°, F2 can be reduced by increasing the angle β between F2 and F6.

[0100] The seventh option is to replace the return spring with one that has a higher elastic modulus. The higher the elastic modulus, the greater the elastic force that can be generated under the same amount of compression, and therefore the greater the return force.

[0101] The brake booster assembly 1000 can be manufactured using 3D modeling during the design phase, for example, using software such as CATIA, SolidWorks, and UG. These software programs can easily obtain the values ​​of L1, L2, L3, L4, α, and β. Then, after selecting the appropriate materials for the pedal arm 210, pedal pad 220, bracket 240, and switch trigger plate 231 based on the actual situation, the software can automatically calculate the weight and center of gravity. Parameters such as the return force and the elastic force of the switch trigger plate 231 can be calculated based on experience or Hooke's Law. After obtaining and comparing the parameters F1, F2, and F4, if F4 ≤ F1 + F2, modifications can be made using the seven methods mentioned above. Of course, any other method that makes F4 > F1 + F2 is also acceptable; the appropriate solution should be selected based on the specific circumstances.

[0102] One embodiment of the present invention provides a control device built into a computer, including one or more control processors and a memory, which can be connected via a bus or other means.

[0103] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the control processor, and these remote memories can be connected to the control device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0104] The non-transient software program and instructions required to implement the control method applied to the control device in the above embodiments are stored in memory. When executed by the controlled processor, the design method applied to the control device in the above embodiments is executed, for example, the above... Figure 6 Method steps S601 to S606 in the above method Figure 7 Method steps S701 to S705 and Figure 8 The method steps S801 to S805.

[0105] This invention discloses a brake booster assembly 1000, manufactured using the design method described in the above embodiments. In this embodiment, the brake booster assembly 1000 utilizes the design method described above. Since the pressure generated by the self-weight of the pedal mechanism 200 or other structures affects the return force, the residual pressure applied by the pedal mechanism 200 to the booster push rod 310 is compared with the return force applied by the booster push rod 310 to the pedal arm 210. When the return force is greater than the residual pressure, it indicates that the return effect of the pedal mechanism 200 is satisfactory, the pedal arm 210 can return smoothly, reducing residual braking torque and improving the service life of the brake friction pads. When the return force is less than or equal to the residual pressure, it indicates that the pedal arm 210 cannot return, and the return effect is unsatisfactory. This can be addressed by reducing the residual pressure or increasing the return force to ensure a suitable return effect. Using the above design method provides a more reasonable judgment standard for the magnitude of the return force, simplifying the design of the return force of the pedal mechanism 200. Meanwhile, the pedal mechanism 200 itself does not have a return spring, which simplifies the pedal mechanism 200 and reduces production costs.

[0106] Reference Figure 6 As shown in the embodiment of the present invention, the mounting frame 100 includes a rotating shaft 130, a connecting plate 110, and side plates 120. Two side plates 120 are provided, spaced apart. The connecting plate 110 connects the two side plates 120 to connect and fix them, thereby improving the overall strength of the mounting frame 100. The rotating shaft 130 and the connecting plate 110 are spaced apart and fixedly connected between the two side plates 120. The pedal arm 210 is rotatably connected to the rotating shaft 130, allowing the pedal arm 210 to swing around the rotating shaft 130 when the user steps on the pedal pad 220.

[0107] Reference Figure 6 As shown, in the embodiment of the present invention, a clearance groove 121 is formed between the two side plates 120 to avoid the booster push rod 310. The booster push rod 310 passes through the clearance groove 121, and both side plates 120 are fixedly connected to the side of the vacuum booster 320 facing the pedal arm 210, which improves the stability and reliability of the connection and reduces the risk of the mounting bracket 100 easily loosening and falling off. Therefore, the structural design of the mounting bracket 100 is reasonable and the safety is high.

[0108] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A design method for a braking assist component, characterized in that, The braking assist component includes: Mounting rack; The pedal mechanism includes a pedal arm, a pedal pad, a bracket, and a switch trigger piece. One end of the pedal arm is connected to the pedal pad, and the other end of the pedal arm is rotatably connected to the mounting bracket. The bracket is fixedly connected to the pedal arm, and the switch trigger piece is connected to the bracket. The assist mechanism includes an assist push rod, one end of which is rotatably connected to the pedal arm; The design method includes: Obtaining the residual pressure applied by the pedal mechanism to the booster push rod includes: The elastic force applied to the pedal arm by the switch trigger piece is defined as F3; The brake assist component is processed to satisfy the following: on the projection plane perpendicular to the rotation axis of the pedal arm, let the rotation center point of the mounting bracket and the pedal arm rotation connection be point A, and the shortest distance from the straight line coinciding with the direction of the force F3 applied to the pedal arm to point A be L3. The rotation center of the connection between the booster push rod and the pedal arm is defined as point C, and the distance between point A and point C is L4. Define the angle β between the straight line that coincides with the direction of the force applied to the pedal arm by F3 and the direction of movement of the booster push rod; The residual pressure is calculated by including the pressure F2 applied by the switch trigger plate to the booster push rod, satisfying: F2=cosβ (F3) L3 / L4); The return force applied to the pedal arm by the booster push rod is obtained, and the direction of the return force is opposite to the direction of the residual pressure; Compare the magnitudes of the return force and the residual pressure; When the return force is greater than the residual pressure, the return effect of the pedal mechanism is deemed to be qualified. When the return force is less than or equal to the residual pressure, the return effect of the pedal mechanism is deemed unqualified. The residual pressure is reduced and / or the return force is increased until the return force is greater than the residual pressure.

2. The design method of the brake assist component according to claim 1, characterized in that, The process of obtaining the residual pressure applied to the booster push rod by the pedal mechanism includes: The total weight of the pedal mechanism is defined as G; The brake assist component is processed to satisfy the following: on the projection plane perpendicular to the rotation axis of the pedal arm, let the rotation center point of the mounting bracket and the pedal arm rotation connection be point A, the centroid of the pedal mechanism be point B, and the shortest distance between the straight line passing through point A and parallel to the moving direction of the booster push rod and point B be L1. Define the rotation center point at the rotatable connection between the booster push rod and the pedal arm as point C, and define the shortest distance between the straight line parallel to the moving direction of the booster push rod and passing through point C and point A as L2; Define α as the angle between the line connecting point A and point B and the direction of the total weight G of the pedal mechanism; The residual pressure, including the pressure F1 exerted on the booster push rod by the total weight G of the pedal mechanism, is calculated to satisfy: F1 = tanα G L1 / L2.

3. The design method of the brake assist component according to claim 2, characterized in that, The method for reducing residual pressure includes any one or more of the following: Reduce the overall weight of the pedal mechanism; Change the position of the center of mass of the pedal mechanism; Increase the distance between point B and the straight line passing through point A and parallel to the direction of movement of the booster push rod.

4. The design method of the brake assist component according to claim 2, characterized in that, The design method further includes: The total weight G of the pedal mechanism is obtained by calculating the sum of the weights of the pedal arm, the pedal pad, the switch trigger piece, and the bracket.

5. The design method of the brake assist component according to claim 1, characterized in that, The method for reducing residual pressure includes any one or more of the following: Change the direction of the force applied by F3 to the pedal arm; Increase the distance between point A and point C; Change the direction of movement of the booster push rod.

6. The design method of the brake assist component according to claim 1, characterized in that, The assist mechanism further includes a return spring, which provides the return force to the assist push rod, and the method for increasing the return force includes: Replace with a return spring that has a higher elastic coefficient.

7. The design method of the brake assist component according to claim 1, characterized in that, The return force is F4, which satisfies: 25N≤F4≤35N.

8. A brake booster assembly, characterized in that, The brake assist component is manufactured using the design method according to any one of claims 1 to 7.

9. The brake assist assembly according to claim 8, characterized in that, The mounting bracket includes a rotating shaft, a connecting plate, and two side plates. The two side plates are spaced apart, and the connecting plate is connected between the two side plates. The rotating shaft and the connecting plate are spaced apart and fixedly connected between the two side plates. The pedal arm and the rotating shaft are rotatably connected.

10. The brake assist assembly according to claim 9, characterized in that, The assist mechanism also includes a vacuum booster and a brake master cylinder. The vacuum booster is connected between the brake master cylinder and the booster push rod. A clearance groove is formed between the two side plates to avoid the booster push rod. The booster push rod passes through the clearance groove, and both side plates are fixedly connected to the vacuum booster.

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