Dry type electronic pedal simulator with hysteresis characteristic

Abstract

The invention relates to a dry-type electronic pedal simulator with a hysteresis characteristic, which belongs to the technical field of automobile braking and comprises a shell, a cavity is formed in the shell, the inner peripheral wall of the cavity is conical, a cover plate covers the open side of the cavity, and a first support frame and a second support frame are arranged in the cavity in a sliding manner. A first elastic element is arranged between the first supporting frame and the second supporting frame, and a second elastic element is arranged between the second supporting frame and the bottom face of the cavity. A ball push rod is arranged on the outer side of the cover plate, one end of the ball push rod penetrates through the cover plate and is connected with a first supporting frame, and a damping ring is arranged on the periphery of the first supporting frame. The device has the advantages that the first elastic element and the second elastic element are compressed step by step, and sectional elastic force is provided to simulate the pedal feeling; the damping ring is in friction with the inner wall of the conical cavity to provide a hysteresis feeling, the deeper the ball push rod is pushed, the larger the friction between the damping ring and the inner wall of the cavity is, and the feeling that the hysteresis feeling of a pedal of a traditional vacuum booster is increased along with the increase of displacement is simulated.

Description

Technical Field

[0001] The invention relates to the technical field of automobile braking, in particular to a dry electronic pedal simulator with hysteresis characteristics. Background Art

[0002] In the field of new energy vehicle braking, there are EHB (electronic hydraulic brake) and EMB (electronic mechanical brake). Among them, electronic hydraulic brake cannot generate the same pedal tactile feedback to the driver as the hydraulic brake system because there is no mechanical connection between the brake pedal and the brake system. Therefore, it is necessary to add a pedal unit that can simulate nonlinear feedback force.

[0003] The problem is that the pedal of a traditional vacuum booster has a hysteresis feeling, and the hysteresis feeling increases with the displacement. The hysteresis feeling of the existing dry electronic pedal feel simulator is basically the same throughout the entire working stroke, which cannot simulate the pedal feel that the driver is accustomed to, and increases additional learning costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a dry electronic pedal simulator which can fully simulate the hysteresis feeling.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a dry electronic pedal simulator with hysteresis characteristics, comprising a shell, a chamber is opened in the shell, the inner peripheral wall of the chamber is conical and the conical large end is open, the open side cover of the chamber is provided with a cover plate, a first support frame and a second support frame are sequentially slidably arranged in the chamber in a direction away from the cover plate, a first elastic element is arranged between the first support frame and the second support frame, a second elastic element is arranged between the second support frame and the bottom surface of the conical small end of the chamber, and the elastic force of the second elastic element is smaller than that of the first elastic element;

[0006] A ball push rod is arranged on the outer side of the cover plate, one end of the ball push rod passes through the cover plate and is connected to the first support frame, and a damping ring in contact with the inner peripheral wall of the chamber is arranged on the outer periphery of the first support frame.

[0007] The beneficial effects of the present invention are as follows: when the ball head push rod is pushed, the first elastic element and the second elastic element are gradually compressed to provide a segmented elastic force to simulate the pedal feel; the friction between the damping ring and the inner wall of the conical chamber provides a hysteresis feel, and the deeper the ball head push rod is pushed, the greater the friction between the damping ring and the inner wall of the chamber, simulating the feeling that the hysteresis feel of the traditional vacuum booster pedal increases with the increase of displacement.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, it includes a plurality of displacement sensor components, wherein the receiver part of the displacement sensor component is fixed on the outer wall of the shell, the first support frame is provided with a mounting groove corresponding to the receiver part one by one, and the magnet part of the displacement sensor component is fixedly installed in the mounting groove.

[0010] The beneficial effects of adopting the above further solution are: eliminating the traditional special-shaped magnet support frame, reducing costs, and improving the positioning accuracy of the displacement sensor.

[0011] Furthermore, the mounting groove is filled with curing glue.

[0012] The beneficial effect of adopting the above further solution is that the magnet part is more firmly fixed on the first support frame.

[0013] Furthermore, an annular groove is provided on the inner bottom surface of the chamber, a transition rubber is arranged in the annular groove, and a top end of the transition rubber extends out of the annular groove.

[0014] The beneficial effect of adopting the above further solution is that the transition rubber ensures that after the second elastic element is compressed, the first elastic element intervenes more smoothly without obvious step feeling.

[0015] Furthermore, a first countersunk hole is opened on the inner bottom surface of the chamber, a third elastic element is installed in the first countersunk hole, a push rod is fixed on the first support frame, one end of the push rod facing the cover plate is connected to the ball head push rod, and the other end of the push rod passes through the first support frame and the second support frame in sequence and points to the third elastic element, and the distance between the push rod and the third elastic element is greater than the sliding stroke of the second support frame and smaller than the sliding stroke of the first support frame.

[0016] The beneficial effect of adopting the above further solution is that the third elastic element provides a third section of elastic force for the compression end of the first elastic element, simulating the feeling of the pedal hitting the bottom after the pedal is lowered.

[0017] Furthermore, an adapter is fixedly provided at one end of the ball head push rod away from the first support frame, and a push rod spring is sleeved on the outer periphery of the ball head push rod. One end of the push rod spring abuts against the end surface of the cover plate, and the other end abuts against the end surface of the adapter.

[0018] The beneficial effect of adopting the above further solution is that the push rod spring is used to provide the initial force of the pedal.

[0019] Furthermore, a dust cover is provided on the outer periphery of the push rod spring, one end of the dust cover is fixedly connected to the adapter, and the other end of the dust cover is fixedly connected to the cover plate.

[0020] The beneficial effect of adopting the above further solution is that the dust cover protects the ball head push rod and the cover plate to prevent dust from entering the chamber.

[0021] Furthermore, one end of the adapter away from the ball head push rod is fixedly connected to a pedal connecting rod.

[0022] The beneficial effect of adopting the above further solution is that the pedal connecting rod can be better connected to the pedal.

[0023] Furthermore, the tapered angle of the inner wall of the chamber is 0.6°.

[0024] The beneficial effect of adopting the above further solution is: the interference of the damping ring is gradually increased through the tapered angle of the inner wall of the chamber, the friction of the damping ring is increased, and the structure is simple.

[0025] Furthermore, the damping ring is made of PTFE.

[0026] The beneficial effects of adopting the above further scheme are: good wear resistance, greatly improved service life, and the durability of the simulator is increased from 50,000 to 100,000 times to the 2.2 million times required by the braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall cross-sectional view of the present invention.

[0028] Figure 2 It is an exploded view of the parts of the present invention.

[0029] Figure 3 It is a schematic diagram of a first support frame of the present invention.

[0030] Figure 4 It is a cross-sectional view of the first support frame of the present invention.

[0031] Figure 5 It is a cross-sectional view of the shell of the present invention.

[0032] Figure 6 It is a schematic diagram of the initial, middle and final stages of the pedal feel of the present invention.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. Shell; 2. Chamber; 3. Cover plate; 4. First support frame; 5. Second support frame; 6. First elastic element; 7. Second elastic element; 8. Ball head push rod; 9. Damping ring; 10. Receiver part; 11. Mounting groove; 12. Magnet part; 13. Ring groove; 14. Transition rubber; 15. First countersunk hole; 16. Third elastic element; 17. Push rod; 18. Adapter; 19. Push rod spring; 20. Dust cover; 21. Pedal connecting rod; 22. Damping ring mounting groove; 23. Second countersunk hole; 24. Sensor mounting groove. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] Example 1

[0037] like Figure 1 to Figure 2 As shown, a dry-type electronic pedal simulator with hysteresis characteristics comprises a shell 1, a chamber 2 is provided in the shell 1, the inner peripheral wall of the chamber 2 is tapered and one side of the tapered large end is open, the open side of the chamber 2 is covered with a cover plate 3, a first support frame 4 and a second support frame 5 are sequentially slidably provided in the chamber 2 in a direction away from the cover plate 3, a first elastic element 6 is provided between the first support frame 4 and the second support frame 5, a second elastic element 7 is provided between the second support frame 5 and the bottom surface of the tapered small end of the chamber 2, and the elastic force of the second elastic element 7 is smaller than that of the first elastic element 6;

[0038] A ball push rod 8 is arranged on the outer side of the cover plate 3 , one end of which passes through the cover plate 3 and is connected to the first support frame 4 , and a damping ring 9 in contact with the inner wall of the chamber 2 is arranged on the outer periphery of the first support frame 4 .

[0039] The beneficial effects of this embodiment are: when the ball head push rod 8 is pushed, the first elastic element 6 and the second elastic element 7 are gradually compressed to provide a segmented elastic force to simulate the pedal feel; the friction between the damping ring 9 and the inner wall of the conical chamber 2 provides a hysteresis feel, and the deeper the ball head push rod 8 is pushed, the greater the friction between the damping ring 9 and the inner wall of the chamber 2, simulating the feeling that the hysteresis feel of the traditional vacuum booster pedal increases with the increase of displacement.

[0040] Specifically, the first support frame 4 and the second support frame 5 are cylindrical, the first elastic element 6 and the second elastic element 7 are coil springs, the first support frame 4 has a first limiting step on the bottom surface for limiting one end of the first elastic element 6, the second support frame 5 has a second limiting step on the top surface for limiting the other end of the first elastic element 6, and the second support frame 5 has a limiting groove on the bottom surface for the second elastic element 7 to prevent the spring from moving;

[0041] A damping ring installation groove 22 is provided on the outer wall of the first support frame 4, and the damping ring 9 is sleeved and fixed in the damping ring installation groove 22. The outer diameter of the damping ring 9 is larger than the outer diameter of the first support frame 4, so the outer wall of the damping ring 9 contacts the inner wall of the chamber 2 in an interference fit.

[0042] In this embodiment, in the initial state, the first elastic element 6 and the second elastic element 7 are both in the released state. When the ball head push rod 8 is pushed to move into the chamber 2, the ball head push rod 8 drives the first support frame 4 and the second support frame 5 to slide downward. Since the elastic force of the second elastic element 7 is smaller than that of the first elastic element 6, the second elastic element 7 is compressed first.

[0043] Until the second support frame 5 touches the bottom surface of the tapered small end of the chamber 2, the second support frame 5 can no longer descend, the first elastic element 6 begins to be compressed, and the first support frame 4 gradually approaches the second support frame 5. When the bottom of the first support frame 4 abuts against the top surface of the second support frame 5, the stroke ends.

[0044] During the descent of the first support frame 4, the interference between the damping ring 9 and the inner wall of the conical chamber 2 becomes larger and larger, resulting in a continuous increase in friction, which effectively simulates the hysteresis feeling of a real pedal.

[0045] Hysteresis: When a passenger car driver steps on the brake pedal, at the same displacement, the system friction force on the outward journey is applied to the foot, which makes the foot feel heavy, while the system friction force on the return journey is converted into heat and consumes the force transmitted to the foot, which makes the foot feel light. The difference between the force transmitted to the foot on the outward journey and the force transmitted to the foot on the return journey at the same displacement is the hysteresis.

[0046] Example 2

[0047] like Figure 3 to Figure 4 As shown, preferably, on the basis of Example 1, a plurality of displacement sensor assemblies are included, the receiver part 10 of the displacement sensor assembly is fixed on the outer wall of the shell 1, the first support frame 4 is provided with a mounting groove 11 corresponding to the receiver part 10 one by one, and the magnet part 12 of the displacement sensor assembly is fixedly installed in the mounting groove 11.

[0048] Preferably, the mounting groove 11 is filled with curing glue.

[0049] In this embodiment, there are two groups of displacement sensor components, which are respectively arranged on both sides of the housing 1 to increase the fault tolerance and avoid losing the monitoring capability after one side is damaged.

[0050] Sensor mounting grooves 24 are respectively provided on both sides of the housing 1, and the receiver part 10 is fixedly installed in the sensor mounting groove 24 by screws, and the magnet part 12 is installed in the mounting groove 11, and then the mounting groove 11 is filled with curing glue to prevent the parts from being deformed and falling off after long-term use;

[0051] This embodiment eliminates the traditional special-shaped magnet support frame, reduces costs, and enables the magnet part 12 to be more firmly fixed on the first support frame 4, thereby improving the positioning accuracy of the displacement sensor.

[0052] Example 3

[0053] like Figure 3 to Figure 4 As shown, preferably, on the basis of Embodiment 1-2, an annular groove 13 is provided on the inner bottom surface of the chamber 2 , a transition rubber 14 is arranged in the annular groove 13 , and the top end of the transition rubber 14 extends out from the annular groove 13 .

[0054] In this embodiment, the transition rubber 14 is a rubber ring, and the transition rubber 14 is fixedly installed in the annular groove 13 on the inner bottom surface of the chamber 2. When the ball head push rod 8 drives the first support frame 4 and the second support frame 5 to slide downward, the second elastic element 7 is first compressed with a smaller elastic force. When the second support frame 5 touches the bottom surface of the chamber 2, the second support frame 5 will contact the top of the transition rubber 14, and then the second support frame 5 cannot continue to descend, and the first elastic element 6 begins to be compressed;

[0055] In the above process, the transition rubber 14 ensures that after the second elastic element 7 is compressed, the first elastic element 6 intervenes more smoothly without obvious step feeling.

[0056] As a parallel technical solution of this embodiment, the transition rubber 14 can also be replaced by a coil spring or other elastic elements.

[0057] Example 4

[0058] like Figure 1 and Figure 5 As shown, preferably, on the basis of embodiments 1-3, a first countersunk hole 15 is opened on the inner bottom surface of the chamber 2, a third elastic element 16 is installed in the first countersunk hole 15, a push rod 17 is fixedly provided on the first support frame 4, one end of the push rod 17 facing the cover plate 3 is connected to the ball head push rod 8, the other end of the push rod 17 passes through the first support frame 4 and the second support frame 5 in sequence and points to the third elastic element 16, and the distance between the push rod 17 and the third elastic element 16 is greater than the sliding stroke of the second support frame 5 and smaller than the sliding stroke of the first support frame 4.

[0059] In this embodiment, a second countersunk hole 23 is opened at the bottom of the chamber 2. The first countersunk hole 15 and the second countersunk hole 23 are coaxial with the annular groove 13. The second countersunk hole 23 is used to limit the bottom end of the second elastic element 7 to prevent movement.

[0060] When the first support frame 4 descends, the push rod 17 descends synchronously until the second elastic element 7 is completely compressed and the second support frame 5 contacts the transition rubber 14, but the push rod 17 still does not contact the third elastic element 16;

[0061] When the first elastic element 6 is about to be fully compressed and the bottom surface of the first support frame 4 is about to abut against the top surface of the second support frame 5, the push rod 17 contacts the third elastic element 16 to provide a third elastic force to simulate the feeling of the pedal after it drops to the bottom.

[0062] like Figure 6 As shown, during the whole simulation process, the pedal feel is divided into three sections;

[0063] Initial stage: only the second elastic element 7 is compressed;

[0064] Middle section: after the second elastic element 7 is fully compressed, the first elastic element 6 begins to compress;

[0065] Final stage: At the final stage of compression of the first elastic element 6, the push rod 17 contacts the third elastic element 16, and the first elastic element 6 and the third elastic element 16 are compressed at the same time.

[0066] Based on this embodiment, the third elastic element 16 is a rubber spring, which can simulate a nonlinear elastic curve.

[0067] Example 5

[0068] like Figure 1 and Figure 2 As shown, preferably, on the basis of embodiments 1-4, an adapter 18 is fixedly provided at one end of the ball head push rod 8 away from the first support frame 4, and a push rod spring 19 is sleeved on the outer periphery of the ball head push rod 8, one end of the push rod spring 19 abuts against the end face of the cover plate 3, and the other end abuts against the end face of the adapter 18.

[0069] Preferably, a dust cover 20 is sleeved on the outer periphery of the push rod spring 19 , one end of the dust cover 20 is fixedly connected to the adapter 18 , and the other end of the dust cover 20 is fixedly connected to the cover plate 3 .

[0070] Preferably, one end of the adapter 18 away from the ball push rod 8 is fixedly connected to a pedal connecting rod 21 .

[0071] In this embodiment, the elastic force of the push rod spring 19 is smaller than that of the second elastic element 7. The push rod spring 19 is used to provide an initial force for the pedal to prevent the operator from feeling that the pedal is light and fluttering.

[0072] The adapter 18 is fixedly connected to the ball push rod 8 via threads, the pedal connecting rod 21 is fixedly connected to the adapter 18 via threads, and the dust cover 20 is sleeved on the outermost layer to protect the ball push rod 8 and the cover plate 3 to prevent dust from entering the chamber 2.

[0073] Example 6

[0074] like Figure 5 As shown, preferably, based on embodiments 1-5, the tapered angle of the inner wall of the chamber 2 is 0.6°.

[0075] In this embodiment, the tapered large end of the inner wall of the chamber 2 is open and covered with a cover plate 3, and the small end is closed. The damping ring 9 slides from the large end to the small end. The interference fit of the damping ring 9 is gradually increased through the tapered angle of the inner wall of the chamber 2, thereby increasing the friction of the damping ring 9 and having a simple structure.

[0076] Based on this embodiment, the taper angle of the inner wall of the chamber 2 can be any value in the range of 0.1° to 20°.

[0077] Example 7

[0078] like Figure 1 As shown, preferably, based on embodiments 1-6, the damping ring 9 is made of PTFE.

[0079] Specifically, the hysteresis of existing dry electronic pedal simulators is mostly simulated by the friction between rubber and plastic or metal. The service life of rubber reciprocating friction is 50,000 to 100,000 times, while the life of the simulator is generally required to be 2.2 million times, and the simulation life is seriously insufficient;

[0080] In this embodiment, PTFE is polytetrafluoroethylene, which has good wear resistance and can greatly increase the service life. The durability of the simulator is increased from 50,000 to 100,000 times to the 2.2 million times required by the braking system.

[0081] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A dry electronic pedal simulator with hysteresis characteristics, characterized in that: The invention comprises a shell (1), wherein a chamber (2) is provided in the shell (1), wherein the inner peripheral wall of the chamber (2) is conical and the conical large end is open, and the open side cover of the chamber (2) is provided with a cover plate (3), and a first support frame (4) and a second support frame (5) are sequentially slidably provided in the chamber (2) in a direction away from the cover plate (3), a first elastic element (6) is provided between the first support frame (4) and the second support frame (5), and a second elastic element (7) is provided between the second support frame (5) and the bottom surface of the conical small end of the chamber (2), and the elastic force of the second elastic element (7) is smaller than that of the first elastic element (6); A ball head push rod (8) is arranged on the outside of the cover plate (3), one end of the ball head push rod (8) passes through the cover plate (3) and is connected to the first support frame (4), and a damping ring (9) in contact with the inner wall of the chamber (2) is arranged on the outer periphery of the first support frame (4).

2. A dry electronic pedal simulator with hysteresis characteristics according to claim 1, characterized in that: The invention comprises a plurality of displacement sensor assemblies, wherein a receiver part (10) of the displacement sensor assembly is fixed on the outer wall of the housing (1), a mounting groove (11) corresponding to the receiver part (10) is provided on the first support frame (4), and a magnet part (12) of the displacement sensor assembly is fixedly installed in the mounting groove (11).

3. A dry electronic pedal simulator with hysteresis characteristics according to claim 2, characterized in that: The installation groove (11) is filled with curing glue.

4. A dry electronic pedal simulator with hysteresis characteristics according to claim 1, characterized in that: An annular groove (13) is provided on the inner bottom surface of the chamber (2), a transition rubber (14) is arranged in the annular groove (13), and the top end of the transition rubber (14) extends out from the annular groove (13).

5. A dry electronic pedal simulator with hysteresis characteristics according to claim 4, characterized in that: A first countersunk hole (15) is provided on the inner bottom surface of the chamber (2), and a third elastic element (16) is installed in the first countersunk hole (15). A push rod (17) is fixed on the first support frame (4), and one end of the push rod (17) facing the cover plate (3) is connected to the ball head push rod (8), and the other end of the push rod (17) passes through the first support frame (4) and the second support frame (5) in sequence and points to the third elastic element (16). The distance between the push rod (17) and the third elastic element (16) is greater than the sliding stroke of the second support frame (5) and less than the sliding stroke of the first support frame (4).

6. A dry electronic pedal simulator with hysteresis characteristics according to claim 1, characterized in that: An adapter (18) is fixedly provided at one end of the ball head push rod (8) away from the first support frame (4), and a push rod spring (19) is sleeved on the outer periphery of the ball head push rod (8), one end of the push rod spring (19) abuts against the end surface of the cover plate (3), and the other end abuts against the end surface of the adapter (18).

7. A dry electronic pedal simulator with hysteresis characteristics according to claim 6, characterized in that: The outer periphery of the push rod spring (19) is provided with a dust cover (20), one end of the dust cover (20) is fixedly connected to the adapter (18), and the other end is fixedly connected to the cover plate (3).

8. A dry electronic pedal simulator with hysteresis characteristics according to claim 7, characterized in that: One end of the adapter (18) away from the ball push rod (8) is fixedly connected to a pedal connecting rod (21).

9. A dry electronic pedal simulator with hysteresis characteristics according to any one of claims 1 to 8, characterized in that: The conical angle of the inner wall of the chamber (2) is 0.6°.

10. A dry electronic pedal simulator with hysteresis characteristics according to any one of claims 1 to 8, characterized in that: The damping ring (9) is made of PTFE.

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