Pedal braking feeling simulation device

Abstract

The utility model provides a pedal brake feeling simulation device, and relates to the technical field of brake-by-wire. The device comprises a cylinder body, wherein an accommodating space is formed in the cylinder body; the piston divides the containing space into a first cavity and a second cavity, and a gas channel communicating with the first cavity and the second cavity is formed in the piston. The buffer reset assembly is arranged in the first cavity; the sensing assembly is used for detecting the displacement of the piston; the transmission rod extends into the second cavity and is connected with the piston; and the sealing ring is used for blocking or unblocking the gas channel. The pedal braking feeling simulation device effectively improves the foot jacking feeling when the foot is lifted. And a series of structures needed by hydraulic oil are omitted, the overall structure is compact, the product size is small, and the device can be conveniently arranged and used in a plurality of vehicle cabs.

Description

Technical Field

[0001] This application relates to the technical field of wire-controlled braking, and more particularly, to a pedal braking feeling simulation device. Background Art

[0002] In an electro-mechanical braking system, electrical signals replace hydraulic signals, and a motor is used as the power to drive an actuator for braking. The brake handle and the brake actuator are completely decoupled. Therefore, a braking feeling simulator is required to replace the traditional master cylinder mechanism, identify the driver's braking action, and provide braking force feedback. The pedal feeling simulator transmits the pedal signal to the controller, and the controller makes a decision based on relevant strategies.

[0003] The existing braking feeling simulator has a feeling of kicking the foot when releasing the pedal, making the driver uncomfortable and requiring further improvement. Utility Model Content

[0004] The purpose of this application is to provide a pedal braking feeling simulation device, which can improve the problem that the existing braking feeling simulator has a feeling of kicking the foot when releasing the pedal.

[0005] The embodiments of this application are implemented as follows:

[0006] The embodiments of this application provide a pedal braking feeling simulation device, including:

[0007] A cylinder block, which has an accommodation space inside;

[0008] A piston, which divides the accommodation space into a first chamber and a second chamber. The piston has a gas passage inside that connects the first chamber and the second chamber;

[0009] A buffer and reset assembly, which is arranged in the first chamber;

[0010] An induction assembly, which is used to detect the displacement of the piston;

[0011] A transmission rod, which extends into the second chamber and is connected to the piston; and

[0012] A sealing ring, which is used to block or unblock the gas passage;

[0013] Wherein, when the transmission rod is not driven by an external force, the first chamber and the second chamber are kept in gas communication; when the transmission rod is driven by an external force, the piston moves towards the buffer and reset assembly, the sealing ring blocks the gas passage, and the first chamber and the second chamber are kept airtight; when the driving of the transmission rod is released, the buffer and reset assembly pushes the piston to reset, and the sealing ring unblocks the gas passage.

[0014] In addition, the pedal brake feeling simulation device provided in the embodiment of the present application may also have the following additional technical features:

[0015] In an optional embodiment of the present application, a sealing groove is provided on the outer periphery of the piston, the sealing groove is communicated with the gas channel, the sealing ring is arranged in the sealing groove and is located between the piston and the inner wall of the cylinder body, and the width of the sealing groove is greater than the cross-sectional width of the sealing ring to allow the sealing ring to move.

[0016] In an optional embodiment of the present application, there are multiple gas channels, and the multiple gas channels are arranged around the piston.

[0017] In an optional embodiment of the present application, the gas channel includes a first channel and a second channel, the first channel connects the second chamber and the sealing groove, and the second channel connects the sealing groove and the first chamber;

[0018] Wherein, when the sealing ring blocks the first channel and / or the second channel, the first chamber and the second chamber remain airtight.

[0019] In an optional embodiment of the present application, the connection between the second channel and the sealing groove is located in the middle area of the sealing groove, and when the transmission rod is driven by external force, the sealing ring blocks the first channel; when the transmission rod is released from driving, the sealing ring releases the blocking of the first channel and partially blocks the second channel.

[0020] In an optional embodiment of the present application, the pedal brake feel simulation device also includes a stop pin, the outer wall of the piston is provided with a stop groove, the stop pin is arranged on the cylinder body, the stop pin extends into the stop groove and abuts against the groove wall of the stop groove.

[0021] In an optional embodiment of the present application, one end of the anti-rotation groove is closed.

[0022] In an optional embodiment of the present application, the buffer reset assembly includes a buffer connecting rod, a spring seat, a first spring, a second spring, a first buffer block and a second buffer block;

[0023] The buffer connecting rod is connected to the piston, and the buffer connecting rod is connected to the spring seat. The first buffer block is sleeved on the buffer connecting rod and is located on one side of the spring seat. The first spring is sleeved on the outer periphery of the first buffer block and is connected to the piston. The second spring is sleeved on the spring seat and is located on the side of the spring seat away from the first spring. Both ends of the second spring are abutted by the spring seat and the cylinder body. The second buffer block is fixed to the cylinder body, and the second buffer block corresponds to the position of the spring seat.

[0024] When the piston moves towards the buffer reset assembly, the first spring, the first buffer block, the second spring, and the second buffer block are stressed in sequence.

[0025] In an alternative embodiment of the present application, both the first buffer block and the second buffer block are rubber springs.

[0026] In an alternative embodiment of the present application, the sensing assembly includes a sensor and a sensing element. The sensor is disposed outside the cylinder block, and the sensing element is disposed on the piston and is inductively connected to the sensor.

[0027] The beneficial effects of the present application are as follows:

[0028] The pedal braking feeling simulation device of the present application is provided with a gas passage on the piston, and the gas passage is blocked or unblocked by the sealing ring between the piston and the cylinder block, so that the forces on the piston during the forward and return strokes are different, and there is a lag force during the return stroke, thereby effectively improving the feeling of the foot being pushed up when lifting the foot. And a series of structures required for hydraulic oil are eliminated, the overall structure is compact, the product volume is small, and it is convenient to be arranged and used in the driver's cabs of many vehicles. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0030] Figure 1 An isometric view of the pedal braking feeling simulation device provided for the embodiment of the present application;

[0031] Figure 2 For Figure 1 exploded view;

[0032] Figure 3 For Figure 1 cross-sectional view;

[0033] Figure 4 A partial cross-sectional view when the transmission rod of the pedal braking feeling simulation device is driven by an external force;

[0034] Figure 5 A partial cross-sectional view when the driving of the transmission rod of the pedal braking feeling simulation device is released;

[0035] Figure 6 A displacement-force curve when the influence of air damping is not considered;

[0036] Figure 7The displacement-force curve when considering the influence of air damping.

[0037] Icon: 100 - Pedal braking feeling simulation device; 101 - First chamber; 102 - Second chamber; 10 - Cylinder block; 11 - Main body; 12 - Base; 13 - Press-fit bolt; 20 - Piston; 21 - Gas passage; 211 - First passage; 212 - Second passage; 22 - Sealing groove; 23 - Anti-rotation groove; 31 - Buffer connecting rod; 32 - Spring seat; 33 - First spring; 34 - Second spring; 35 - First buffer block; 36 - Second buffer block; 40 - Induction component; 41 - Displacement sensor; 42 - Magnet; 43 - Retaining ring; 44 - Washer; 51 - Transmission rod; 52 - Ball head seat; 53 - Ball head; 54 - Dust cover; 60 - Sealing ring; 70 - Anti-rotation pin. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0040] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product is normally placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0043] Embodiment

[0044] Please refer to Figures 1 to 3 , an embodiment of the present application provides a pedal braking feeling simulation device 100, including:

[0045] A cylinder block 10, which has an accommodation space inside;

[0046] A piston 20, which divides the accommodation space into a first chamber 101 and a second chamber 102, and has a gas passage 21 inside the piston 20 that communicates the first chamber 101 and the second chamber 102;

[0047] A buffer and reset component, which is arranged in the first chamber 101;

[0048] An induction component 40, which is used to detect the displacement of the piston 20;

[0049] A transmission rod 51, which extends into the second chamber 102 and is connected to the piston 20; and

[0050] A sealing ring 60, which is used to block or unblock the gas passage 21;

[0051] Wherein, please combine Figure 4 and Figure 5 , when the transmission rod 51 is not driven by an external force, the first chamber 101 and the second chamber 102 remain in gas communication; when the transmission rod 51 is driven by an external force, the piston 20 moves towards the buffer and reset component, the sealing ring 60 blocks the gas passage 21, and the first chamber 101 and the second chamber 102 remain gas-tight; when the driving of the transmission rod 51 is released, the buffer and reset component pushes the piston 20 to reset, and the sealing ring 60 unblocks the gas passage 21.

[0052] Briefly speaking, by setting the sealing ring 60 to block or unblock the gas passage 21, air damping can be applied or removed in the first chamber 101 and the second chamber 102. When the driver steps on the pedal, the transmission rod 51 can be driven. Since the first chamber 101 and the second chamber 102 are hermetically sealed from each other, during the process of stepping on the pedal, there is both the reaction force provided by the buffer reset component and the resistance of the air damping, which can realistically simulate the pedaling feeling when a general gasoline vehicle brakes. Also, when the driver releases the pedal, the influence of the air damping can be quickly removed, so that the pedal braking feeling simulation device 100 only relies on the buffer reset component to provide the restoring force. Then, when the pedal returns, with the return stroke unchanged, there will be a lag force in the force feedback to the foot, which can improve the feeling of the pedal pushing against the foot when releasing the pedal.

[0053] Specifically, a sealing groove 22 is provided on the outer periphery of the piston 20. The sealing groove 22 communicates with the gas passage 21. The sealing ring 60 is arranged in the sealing groove 22 and is located between the piston 20 and the inner wall of the cylinder block 10. The width of the sealing groove 22 is greater than the cross-sectional width of the sealing ring 60 to allow the sealing ring 60 to move. In this embodiment, only one sealing groove 22 is provided and only one sealing ring 60 is arranged therein, but it is not limited to only these quantities. When the overall specification size of the pedal simulator is relatively large, other quantities of sealing grooves 22 can also be set according to the requirements of airtight and unsealing, and other quantities of sealing rings 60 can be configured. Also, more sealing rings 60 can be arranged in each sealing groove 22 according to the distribution of the gas passage 21.

[0054] Please refer to Figure 2 , in this embodiment, there are multiple gas passages 21, and the multiple gas passages 21 are circumferentially arranged around the piston 20. The multiple gas passages 21 can allow gas to flow rapidly when ventilation is required.

[0055] Furthermore, please refer to Figure 4 and Figure 5 , in this embodiment, the gas passage 21 includes a first passage 211 and a second passage 212. The first passage 211 communicates the second chamber 102 and the sealing groove 22, and the second passage 212 communicates the sealing groove 22 and the first chamber 101;

[0056] When the sealing ring 60 seals the first channel 211 and / or the second channel 212, the first chamber 101 and the second chamber 102 are kept airtight. Specifically, when it is necessary to achieve the airtightness of the first chamber 101 and the second chamber 102, the sealing ring 60 can seal the first channel 211 alone, or can seal the second channel 212 alone, or can seal both the first channel 211 and the second channel 212 at the same time. Those skilled in the art can select a sealing ring 60 of appropriate size according to this application and set the positions of the first channel 211 and the second channel 212 on the piston 20 to meet the requirements of airtightness or unsealing.

[0057] Further, as Figure 4 and Figure 5 shown, in this embodiment, the connection between the second channel 212 and the sealing groove 22 is located in the middle area of the sealing groove 22. When the transmission rod 51 is driven by an external force, the sealing ring 60 seals the first channel 211; when the driving of the transmission rod 51 is released, the sealing ring 60 releases the sealing of the first channel 211 and partially seals the second channel 212. By further designing the connection position between the second channel 212 and the sealing groove 22, the sealing ring 60 can have space for movement, and the first chamber 101 and the second chamber 102 can be quickly connected without the sealing ring 60 moving too much relative to the piston 20, making the overall structure more compact.

[0058] Please refer to Figure 1 and Figure 2 , the pedal braking feeling simulation device 100 further includes a rotation stopping pin 70. A rotation stopping groove 23 is provided on the outer wall of the piston 20. The rotation stopping pin 70 is provided on the cylinder block 10. The rotation stopping pin 70 extends into the rotation stopping groove 23 and abuts against the groove wall of the rotation stopping groove 23. In this way, when the piston 20 and the cylinder block 10 squeeze the sealing ring 60, the piston 20 will not rotate due to the resistance of the sealing ring 60, ensuring that the piston 20 moves along the axial direction, and it is also a kind of guidance for the sealing ring 60, making the whole sealing ring 60 roll synchronously, and there will be no uneven torsion due to the rotation of the piston 20, so as to ensure that the airtightness and unsealing of the gas channel 21 can be completed.

[0059] Further, one end of the rotation stopping groove 23 in this embodiment is closed, so that when the buffer reset assembly is deformed by force, the rotation stopping pin 70 can abut against the closed end, ensuring that the piston 20 will not travel excessively and also ensuring that the rotation stopping pin 70 will not slide out of the rotation stopping groove 23. Thus, this structure can be used continuously and repeatedly without failing due to structural loosening.

[0060] Regarding the buffer reset assembly, specifically, please refer to Figure 2 and Figure 3The buffer reset assembly of this embodiment includes a buffer connecting rod 31, a spring seat 32, a first spring 33, a second spring 34, a first buffer block 35 and a second buffer block 36;

[0061] The buffer connecting rod 31 is connected to the piston 20, and the buffer connecting rod 31 is connected to the spring seat 32. The first buffer block 35 is sleeved on the buffer connecting rod 31 and is located on one side of the spring seat 32. The first spring 33 is sleeved on the outer periphery of the first buffer block 35 and is connected to the piston 20. The second spring 34 is sleeved on the spring seat 32 and is located on the side of the spring seat 32 away from the first spring 33. The two ends of the second spring 34 are abutted by the spring seat 32 and the cylinder body 10. The second buffer block 36 is fixed to the cylinder body 10, and the position of the second buffer block 36 corresponds to that of the spring seat 32.

[0062] When the piston 20 moves toward the buffer reset assembly, the first spring 33, the first buffer block 35, the second spring 34 and the second buffer block 36 are sequentially stressed. In this embodiment, the first buffer block 35 and the second buffer block 36 are both rubber springs, providing buffering and restoring force.

[0063] Please combine Figure 2 and Figure 3 The sensing component 40 of the present application includes a sensor and a sensing element. The sensor is arranged outside the cylinder body 10, and the sensing element is arranged on the piston 20 and is inductively connected to the sensor. Specifically, the sensor of the present embodiment is a displacement sensor 41, and the sensing element is a magnet 42. Through the movement of the magnet 42, it can generate induction with the displacement sensor 41, so as to feed back the displacement information of the piston 20 to an external receiving end, such as a vehicle using the pedal brake feeling simulation device 100. In other embodiments, a pressure sensor can also be provided to detect the pressure change in the first chamber 101, so as to give the controller feedback on the change of force, so as to brake or release the brake.

[0064] More specifically, the cylinder body 10 of this embodiment is formed by a main body 11 and a base 12 that are detachably connected. One end of the buffer connecting rod 31 of this embodiment is in clearance fit with the inner hole of the piston 20, and the other end is fixedly connected with the spring seat 32. The piston 20 has an inner cavity, and an inner hole is also provided in the center. The magnet 42 is arranged in the inner cavity through a retaining ring 43 and a washer 44, and the spring seat 32 is in the inner cavity and has a distance between it and the magnet 42.

[0065] The first buffer block 35 is sleeved on the buffer connecting rod 31 and is in interference fit with the buffer connecting rod 31. The first spring 33 is abutted against one side of the piston 20 and the spring seat 32. The second spring 34 is supported by the base 12 and the other side of the spring seat 32. A groove is provided in the base 12 for installing the second buffer block 36. The buffer connecting rod 31, the spring seat 32, the first spring 33, the second spring 34, the first buffer block 35 and the second buffer block 36 are all arranged coaxially, and are also coaxial with the inner hole center of the piston 20, ensuring that when the piston 20 moves, the acting force can be transmitted to the buffer reset assembly to the maximum extent, reducing the requirement for the compression space and making the structure more compact.

[0066] When the piston 20 moves in the main body 11, the buffer connecting rod 31 slides in the inner hole of the piston 20. Since there is a distance between the magnet 42 and the spring seat 32, the first spring 33 will be compressed first, and then the solid part at the center of the piston 20 will contact the first buffer block 35 and compress it.

[0067] The transmission rod 51 in this embodiment is a ball head rod. One end of it is connected to the piston 20 through a ball head seat 52, and the other end is connected to a ball head 53. A dust cover 54 is sleeved outside. The ball head 53 is used to connect to an external structure, such as a pedal. Outside the base 12 of the cylinder block 10 mentioned above, a press-fit bolt 13 is provided for connecting to an external structure, such as a vehicle body.

[0068] The principle of this embodiment is:

[0069] The braking feeling simulator in the prior art generally uses hydraulic oil, which not only requires a structure for containing the hydraulic oil, but also requires strong sealing performance to ensure that the hydraulic oil can flow along the preset channels. Whether the structure for containing the hydraulic oil is arranged inside the simulator or externally connected, it will occupy a certain space and increase the overall structure. This is not conducive to being directly installed in the cockpit, making it inconvenient for installation and daily maintenance. And once the seal fails due to the hydraulic oil, the braking sensing signal cannot be correctly fed back to the vehicle control system, posing a certain safety hazard to a certain extent.

[0070] In view of this, the present application proposes a pedal braking feeling simulation device 100 for a wire control braking system. Of course, those skilled in the art can also apply the pedal braking feeling simulation device 100 of the present application to other types of braking systems according to actual needs, which is not limited here.

[0071] Specifically, the usage process of the pedal braking feeling simulation device 100 of the present application is as follows:

[0072] Take Figure 3Taking the view direction as an example, when the driver steps on the pedal, the transmission rod 51 is driven, the piston 20 moves to the left, and compresses the buffer and reset assembly. The compression process is divided into four stages: In the first stage, the first spring 33 begins to compress until the piston 20 contacts the first buffer block 35; In the second stage, the first spring 33 and the first buffer block 35 begin to compress together until the piston 20 contacts the spring seat 32; In the third stage, the second spring 34 begins to compress until the spring seat 32 contacts the second buffer block 36; In the fourth stage, the second spring 34 and the second buffer block 36 compress together until the second spring 34 seat 32 contacts the base 12. The first three stages are the main pedal force feedback stages. When the influence of air damping is not considered, the displacement-force characteristic curve is as Figure 6 shown.

[0073] When the driver releases the pedal, due to the disappearance or weakening of the force on the transmission rod 51, the buffer and reset assembly starts to reset, pushing the piston 20 to move in the reverse direction. During this process, the reverse force provided by the buffer and reset assembly corresponds to the four compression stages described above.

[0074] During the movement of the piston 20 described above, the magnet 42 moves synchronously. The displacement sensor 41 can detect the displacement of the magnet 42 and generate an induced electrical signal, which is processed by the sensor chip and then converted into a displacement signal and transmitted to the controller. This structure can provide a good braking feeling feedback while providing a braking intention signal to the central controller of the braking system. This device is small in size, compact in structure, easy to install, and easy to be arranged and used on the platform.

[0075] Furthermore, since the piston 20 of the present application is provided with a gas passage 21 and is sealed or unsealed by a sealing ring 60, the pedal braking feeling simulation device 100 of the present application also has air damping when being stepped on.

[0076] Please combine with Figure 4 , when stepping on the pedal, the piston 20 moves to the left under the action of the transmission rod 51. Under the action of the frictional force on the inner wall of the cylinder block 10, the sealing ring 60 closely abuts against the right side of the sealing groove 22, and the gas passage 21 from the first chamber 101 to the second chamber 102 is disconnected. The air pressure in the first chamber 101 rapidly increases as the volume of the first chamber 101 decreases. The piston 20 is subject to the resistance of the buffer and reset assembly + the reaction force given by the compressed air in the first chamber 101.

[0077] Please combine with Figure 5 , when releasing the pedal, the piston 20 moves to the right under the reaction force of the buffer and reset assembly. Under the action of the frictional force on the inner wall of the cylinder block 10, the sealing ring 60 closely abuts against the left side of the sealing groove 22, and the gas passage 21 from the first chamber 101 to the second chamber 102 is connected. The air pressure in the first chamber 101 rapidly drops to 0, and the piston 20 is only subject to the thrust of the buffer and reset assembly.

[0078] Please combine with Figure 7 , affected by the air damping structure, the reaction force on the piston 20 during the return stroke is smaller than that during the forward stroke, and there is a hysteresis force. The existence of the hysteresis force can improve the feeling of hitting the foot when releasing the pedal.

[0079] In summary, the pedal braking feeling simulation device 100 of the present application is provided with a gas passage 21 on the piston 20, and the gas passage 21 is blocked or unblocked by the sealing ring 60 between the piston 20 and the cylinder block 10, so that the forces on the piston 20 during the forward and return strokes are different, and there is a hysteresis force during the return stroke, thereby effectively improving the feeling of hitting the foot when lifting the foot. And a series of structures required for hydraulic oil are eliminated, the overall structure is compact, the product volume is small, and it is convenient to be arranged and used in many vehicle cabs.

[0080] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pedal braking feeling simulation device, characterized in that include: A cylinder body, wherein the cylinder body has a containing space; A piston, wherein the piston divides the accommodating space into a first chamber and a second chamber, and the piston has a gas passage connecting the first chamber and the second chamber; A buffer reset component, wherein the buffer reset component is disposed in the first chamber; A sensing component, the sensing component is used to detect the displacement of the piston; a transmission rod extending into the second chamber and connected to the piston; as well as A sealing ring, used to seal or unseal the gas channel; When the transmission rod is not driven by external force, the first chamber and the second chamber maintain air connection; when the transmission rod is driven by external force, the piston moves toward the buffer reset assembly, the sealing ring blocks the gas channel, and the first chamber and the second chamber maintain airtightness; when the transmission rod is released from driving, the buffer reset assembly pushes the piston to reset, and the sealing ring unseals the gas channel.

2. The pedal braking feeling simulation device according to claim 1, wherein, A sealing groove is provided on the outer periphery of the piston, the sealing groove is communicated with the gas channel, the sealing ring is arranged in the sealing groove and is located between the piston and the inner wall of the cylinder body, and the width of the sealing groove is greater than the cross-sectional width of the sealing ring to allow the sealing ring to move.

3. The pedal braking feeling simulation device according to claim 2, characterized in that, There are a plurality of gas channels, and the plurality of gas channels are arranged around the piston.

4. The pedal braking feeling simulation device according to claim 2 or 3, characterized in that, The gas channel includes a first channel and a second channel, the first channel is connected to the second chamber and the sealing groove, and the second channel is connected to the sealing groove and the first chamber; Wherein, when the sealing ring blocks the first channel and / or the second channel, the first chamber and the second chamber remain airtight.

5. The pedal braking feeling simulation device according to claim 4, characterized in that, The connection point between the second channel and the sealing groove is located in the middle area of the sealing groove. When the transmission rod is driven by external force, the sealing ring blocks the first channel; when the transmission rod is released from driving, the sealing ring releases the blocking of the first channel and partially blocks the second channel.

6. The pedal braking feeling simulation device according to claim 1, wherein The pedal brake feeling simulation device also includes a stop pin, a stop groove is provided on the outer wall of the piston, the stop pin is arranged on the cylinder body, and the stop pin extends into the stop groove and abuts against the groove wall of the stop groove.

7. The pedal braking feeling simulation device according to claim 6, characterized in that, One end of the anti-rotation groove is closed.

8. The pedal braking feeling simulation device according to claim 1, characterized in that The buffer reset assembly includes a buffer connecting rod, a spring seat, a first spring, a second spring, a first buffer block and a second buffer block; The buffer connecting rod is connected to the piston, and the buffer connecting rod is connected to the spring seat. The first buffer block is sleeved on the buffer connecting rod and is located on one side of the spring seat. The first spring is sleeved on the outer periphery of the first buffer block and is connected to the piston. The second spring is sleeved on the spring seat and is located on the side of the spring seat away from the first spring. Both ends of the second spring are abutted by the spring seat and the cylinder body. The second buffer block is fixed to the cylinder body, and the second buffer block corresponds to the position of the spring seat. When the piston moves toward the buffer reset assembly, the first spring, the first buffer block, the second spring and the second buffer block are subjected to force in sequence.

9. The pedal braking feeling simulation device according to claim 8, wherein, Both the first buffer block and the second buffer block are rubber springs.

10. The pedal braking feeling simulation device according to claim 1, characterized in that, The induction component includes a sensor and a sensing element. The sensor is arranged outside the cylinder body, and the sensing element is arranged on the piston and is inductively connected to the sensor.

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