Pedal simulator and vehicle

Abstract

The utility model discloses a pedal simulator and a vehicle. The pedal simulator comprises a shell, a piston seat, a limiting column, a piston, a piston rod and a spring. The closed end of the piston seat is provided with an oil inlet hole, the open end of the piston seat extends into the shell from the open end of the shell and is hermetically connected with the shell, and the length of the piston seat extending into the shell is adjustable; the limiting column is arranged at the closed end of the shell in a penetrating mode, and the length of the limiting column extending into the shell is adjustable. The periphery of the piston is hermetically connected with the inner wall of the piston seat; the head section of the piston rod extends into the piston seat; the tail section of the piston rod is provided with a first limiting part of which the peripheral diameter is greater than the opening diameter of the piston seat; one end of the spring is in contact with the bottom wall of the shell, and the other end of the spring is in contact with the bottom wall of the limiting part of the piston rod. According to the utility model, ideal pedal feeling can be obtained directly through partial structure or displacement adjustment, and the problems of low matching efficiency and high cost in practical application of the brake master cylinder and the pedal simulator in the prior art are solved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive braking technology, and in particular relates to a pedal simulator and vehicle. Background Technology

[0002] New electric vehicles typically employ electro-hydraulic braking systems (EHB). To meet the requirements of linear braking, the brake pedal needs to be decoupled from the brake. The EHB system provides the driver with pedal feel during braking by installing a master cylinder and a hydraulic pedal feel simulator (hereinafter referred to as a 'pedal simulator'). In this case, the pedal simulator is designed to provide a reaction force similar to that of the pedal simulator in a conventional hydraulic braking system (CBS).

[0003] Since different vehicle models require different pedal feel, existing technologies are usually verified on the assembly after theoretical calculations. This requires re-manufacturing the product assembly, riveting it, and installing it on the vehicle for verification, which results in a cumbersome matching process, low efficiency, and high cost. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a pedal simulator and a vehicle.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] case;

[0007] The piston seat has an oil inlet at its closed end and its open end extends into the housing from the open end of the housing and is sealed to the housing. The length of the piston seat extending into the housing is adjustable.

[0008] The limiting post is inserted through the closed end of the housing and its length extending into the housing is adjustable;

[0009] The piston's outer circumference is sealed to the inner wall of the piston seat;

[0010] The piston rod has a head section that extends into the piston seat and a tail section that has a first limiting portion with an outer circumferential diameter larger than the opening diameter of the piston seat; and

[0011] A spring is fitted onto the limiting post, with one end of the spring in contact with the bottom wall of the housing and the other end in contact with the bottom wall of the limiting part of the piston rod.

[0012] In some embodiments, both the piston seat and the limiting post are sealed to the housing via threaded connections.

[0013] In some embodiments, the change in the length of the piston seat extending into the housing is determined by the thread pitch when the piston seat is rotated one revolution.

[0014] In some embodiments, the limiting surface of the piston seat in contact with the housing is provided with a second limiting portion.

[0015] In some embodiments, the length of the second limiting portion is adjustable, and the initial gap between the piston and the piston rod is changed by changing the length of the second limiting portion.

[0016] In some embodiments, both the bottom of the piston seat and the bottom of the limiting post are provided with handle structures that facilitate turning and rotating.

[0017] In some embodiments, the contact surface between the outer periphery of the piston and the inner wall of the piston seat is provided with a seal.

[0018] Secondly, a vehicle is provided, including: the aforementioned pedal simulator.

[0019] The beneficial effects of this utility model are: the structure of this utility model is compact and highly adjustable, and the ideal pedal feel can be obtained directly by adjusting part of the structure or displacement. Then, the adjusted parameters are applied to the product assembly, which solves the problems of complex matching process, low efficiency and high cost in the actual application of brake master cylinder and pedal simulator in the prior art. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional structural diagram of the present invention in a first state according to one embodiment;

[0022] Figure 2 This is a cross-sectional structural diagram of the present invention in a first state according to one embodiment;

[0023] Figure 3 This is a schematic diagram of the connection between the piston seat, housing, piston, and piston rod in one embodiment of the present invention. Detailed Implementation

[0024] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-3 As shown, a pedal simulator is provided, including a housing 10, a piston seat 20, a limiting post 30, a piston 40, a piston rod 50, and a spring 60.

[0026] The closed end of the piston seat 20 has an oil inlet hole 201, and its open end extends into the interior of the housing 10 from the open end of the housing 10 and is sealed to the housing 10. The length of the piston seat 20 extending into the interior of the housing 10 is adjustable. The limiting post 30 passes through the closed end of the housing 10 and its length extending into the interior of the housing 10 is adjustable. The outer periphery of the piston 40 is sealed to the inner wall of the piston seat 20. The head section of the piston rod 50 extends into the interior of the piston seat 20, and its tail section has a first limiting part 501 with an outer periphery diameter larger than the opening diameter of the piston seat 20. The spring 60 is sleeved on the limiting post 30. One end of the spring 60 contacts the bottom wall of the housing 10, and the other end contacts the bottom wall of the limiting part of the piston rod 50.

[0027] Understandably, in traditional hydraulic braking systems, the force applied by the driver's foot is converted into hydraulic pressure by the vacuum booster and the master cylinder, which then acts on the brake calipers, pushing the brake pads and discs to achieve deceleration. During the braking process, the contact between the brake pads and the brake disc generates a reaction force that is hydraulically transmitted back to the pedal, providing braking feedback to the driver. This braking force feedback generally occurs in three stages: Stage 1: Initially, there is a period of almost no feedback during the pedal's travel; Stage 2: A noticeable force feedback begins (this is a combined force feedback from the hydraulic pressure and the braking components); Stage 3: The force reaches its maximum, and the pedal remains fully depressed.

[0028] The simulator of this invention applies the force of spring 60 to piston 40 and piston rod 50. The force of spring 60 is converted into hydraulic pressure and fed back to the driver's foot, forming a force feedback similar to that in traditional braking. Specifically, when the driver presses the pedal, the brake fluid in the master cylinder enters the piston seat 20 through the oil inlet 201, hydraulically pushing piston 40 to move. After piston 40 abuts against the head of piston rod 50, piston 40 drives piston rod 50 to move simultaneously, causing spring 60 to deform. The rebound force generated by spring 60 produces the pedal feedback, thus simulating the pedal feel. This invention uses the initial gap 70 between piston 40 and piston rod 50 to simulate the idle travel process in the first stage of traditional braking; after piston 40 moves and contacts piston rod 50, the rebound force of spring 60 simulates the force feedback process in the second stage of traditional braking; after piston rod 50 continues to move a certain distance, the first limiting part 501 of piston rod 50 abuts against limiting post 30 and stops moving forward, thus simulating the pedal stopping in the third stage of traditional braking.

[0029] This invention is highly adjustable and can achieve the ideal pedal feel by directly adjusting the following structural or displacement points:

[0030] (a) By replacing the spring 60 with different specifications, the feedback force of the spring 60 under different force values ​​can be flexibly adjusted, thereby adjusting the pedal feel under different force values ​​of the spring 60.

[0031] (ii) By replacing the piston seat 20 with different specifications and the piston cylinder diameter, the required discharge volume of the brake master cylinder is matched to ensure that the pedal feel is not affected by too much or too little fluid. At the same time, according to the pressure formula: F=P*S, different pedal force values ​​are simulated. That is, when the piston cylinder diameter area S is constant, the greater the spring force F of the simulated pedal force, the greater the hydraulic pressure P, and vice versa.

[0032] (iii) By changing the length of the piston seat 20 extending into the housing 10, the initial working position of the spring 60 is changed to achieve different preload forces and simulate different initial pedal feel.

[0033] (iv) By adjusting the initial gap 70 between piston 40 and piston rod 50, different vehicle idle travel durations are simulated.

[0034] (v) By changing the length of the limit post 30 extending into the housing 10, the maximum displacement stroke of the piston 40 and the spring 60 is changed, thereby adjusting the pedal feel duration in stage two.

[0035] As shown in the figure, in one embodiment, the piston seat 20 and the limiting post 30 are both sealed to the housing 10 by a threaded structure.

[0036] It is understandable that, in order to facilitate the adjustment of the length of the piston seat 20 extending into the housing 10 and the length of the limiting post 30 extending into the housing 10, it is preferable to use a threaded connection to seal the piston seat 20 and the limiting post 30 to the housing 10.

[0037] like Figure 1-2 As shown, in one embodiment, the change in the length of the piston seat 20 extending into the housing 10 after one revolution is determined by the thread pitch. In one embodiment, the change in the length of the piston seat 20 extending into the housing 10 is 0.5 mm. In another embodiment, the change in the distance between the top of the limiting post 30 and the limiting portion in the piston rod 50 after one revolution is 0.5 mm.

[0038] Understandably, to facilitate adjustment of the specific length of the piston seat 20 extending into the housing 10, it is preferable to have a threaded structure where rotating the piston seat 20 one revolution changes the length of its extension into the housing 10 by 0.5 mm. Similarly, to adjust the length of the limiting post 30 extending into the housing 10, it is preferable to have a threaded structure where rotating the limiting post 30 one revolution changes the distance between the top of the limiting post 30 and the limiting portion in the piston rod 50 by 0.5 mm. Figure 1-2As shown, by rotating the piston seat 20, the distance between the piston 40 and the piston rod 50 is changed, thereby altering the initial working position of the spring 60 to achieve different preload forces and simulate different initial pedal sensations; that is, when we turn the piston seat 20, the displacement of the piston rod 50 adjusts the deformation of the spring 60, thus adjusting the initial preload force of the spring 60 to simulate different initial pedal sensations. Figure 1-2 As shown, by turning the limiting pin 30 to limit the displacement stroke of the piston 40 and the spring 60, the feedback force and compression stroke of the spring 60 are changed, simulating the feedback force of the spring 60 under different displacement strokes in stage two, thereby achieving the effect of adjusting the pedal feel and displacement stroke in stage two.

[0039] like Figure 1 As shown, in one embodiment, the limiting surface of the piston seat 20 that contacts the housing 10 is provided with a second limiting part 80.

[0040] like Figure 3 As shown, in one embodiment, the length of the second limiting part 80 is adjustable, and the initial gap 70 between the piston 40 and the piston rod 50 is changed by changing the length of the second limiting part 80.

[0041] It is understandable that, in order to simulate the idle travel of a vehicle, there is an initial gap 70 between the piston 40 and the piston rod 50 in the initial state of this invention. This initial gap 70 can be adjusted by replacing the piston rod 50 with different lengths, or by providing a second limiting part 80 on the limiting surface where the piston seat 20 contacts the housing 10. The initial gap 70 between the piston 40 and the piston rod 50 can be changed by changing the length of the second limiting part 80. The second limiting part 80 can be an integral structure with the piston seat 20. The length of the second limiting part 80 can be adjusted by replacing the piston seat 20 with different specifications. Compared with replacing the piston rod 50, replacing the piston seat 20 is easier, involves fewer disassembly parts, and reduces the number of parts of different specifications. The second limiting part 80 can also be set as a separate shim structure that allows for more flexible length adjustment.

[0042] like Figure 1 As shown, in one embodiment, to facilitate turning, both the bottom of the piston seat 20 and the bottom of the limiting post 30 are provided with handle structures that facilitate turning and rotating.

[0043] like Figure 1 As shown, in one embodiment, in order to seal the piston 40 and piston seat 20 to prevent hydraulic leakage, a sealing element is provided on the contact surface between the outer periphery of the piston 40 and the inner wall of the piston seat 20. In one embodiment, the sealing element is an O-ring 90.

[0044] The working process of this utility model is as follows: The oil inlet 201 in the piston seat 20 is connected to the brake master cylinder via an oil pipe. When the brake pedal is depressed, brake fluid in the brake master cylinder enters the piston seat 20 through the oil inlet 201, hydraulically pushing the piston 40 forward until it abuts against the push rod of the piston rod 50. At this point, the piston 40 and piston rod 50 move forward simultaneously, causing the spring 60103 to deform until it contacts the limiting post 30, thus limiting the pedal travel and completing the simulation matching process for pedal feel. By replacing the spring 60 with different specifications, the feedback force of the spring 60 under different force values ​​can be flexibly adjusted, thereby adjusting and simulating the pedal feel under different force values ​​of the spring 60. By replacing the piston seat 20 with different specifications and the piston cylinder diameter, the required discharge volume of the brake master cylinder can be matched, ensuring that the pedal feel is not affected by too much or too little fluid. By changing the length of the piston seat 20 extending into the housing 10, the initial working position of the spring 60 can be changed to achieve different preload forces, simulating different initial pedal feels. By replacing the piston rod 50 with different specifications and adjusting the length of the second limiting part 80, the initial gap 70 between the piston 40 and the piston rod 50 is adjusted to simulate different vehicle idle travel durations. The maximum displacement travel of the piston 40 and spring 60 is changed by altering the length of the limiting post 30 extending into the housing 10, thus adjusting the pedal feel duration in stage two. Finally, we organize the data from the entire simulator process, collecting values ​​such as idle travel, spring 60 stiffness, spring 60 compression stroke, and piston cylinder diameter, and apply these values ​​to the assembly product for matching, which can significantly save development costs.

[0045] The above description is merely a preferred embodiment of one or more embodiments of this specification and is not intended to limit the scope of one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the protection scope of one or more embodiments of this specification.

Claims

1. A pedal simulator characterized by, include: case; The piston seat has an oil inlet at its closed end and its open end extends into the housing from the open end of the housing and is sealed to the housing. The length of the piston seat extending into the housing is adjustable. A limiting post is inserted through the closed end of the housing, and its length extending into the housing is adjustable; The piston's outer periphery is sealed to the inner wall of the piston seat; The piston rod has a head section that extends into the piston seat and a tail section that has a first limiting portion with an outer circumferential diameter larger than the opening diameter of the piston seat; and A spring is sleeved on the limiting post, with one end of the spring contacting the bottom wall of the housing and the other end contacting the bottom wall of the limiting part of the piston rod.

2. The pedal simulator according to claim 1, characterized in that: Both the piston seat and the limiting post are sealed to the housing via threaded connections.

3. Pedal simulator according to claim 2, characterized in that: The change in the length of the piston seat extending into the housing by rotating the piston seat one revolution is determined based on the thread pitch.

4. The pedal simulator of claim 1, wherein: The limiting surface where the piston seat contacts the housing is provided with a second limiting part.

5. The pedal simulator according to claim 4, characterized in that: The length of the second limiting part is adjustable, and the initial gap between the piston and the piston rod can be changed by changing the length of the second limiting part.

6. The pedal simulator of claim 1, wherein: Both the bottom of the piston seat and the bottom of the limiting post are provided with handle structures that facilitate turning and rotating.

7. The pedal simulator of claim 1, wherein: The contact surface between the outer periphery of the piston and the inner wall of the piston seat is provided with a sealing element.

8. A vehicle characterized by comprising: The pedal simulator as described in any one of claims 1-7.

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